refactor

21 files changed, 0 insertions, 3804 deletions

diff --git a/src/commands/cat.c b/src/commands/cat.c
deleted file mode 100644
index 0495fe3..0000000
--- a/src/commands/cat.c
+++ /dev/null
@@ -1,140 +0,0 @@
-#include "../command.h"
-
-#include <ctype.h>
-
-static struct {
-    bool number_lines;
-    bool number_non_empty;
-    bool change_non_print;
-    bool change_tabs;
-    bool end_lines_dollar;
-} flags;
-
-static bool printable(char c) {
-    switch (c) {
-        case '\n': return true;
-        case '\r': return true;
-        case '\b': return true;
-        case '\t': return true;
-        default: return isprint(c) == 0;
-    }
-}
-
-static void help(void) {
-    printf("Usage: cat [-nbvteA] [FILE]...\n\n");
-    printf("Print FILEs to stdout\n\n");
-    printf("\t-n	Number output lines\n");
-    printf("\t-b	Number nonempty lines\n");
-    printf("\t-v	Show nonprinting characters as ^x or M-x\n");
-    printf("\t-t	...and tabs as ^I\n");
-    printf("\t-e	...and end lines with $\n");
-    printf("\t-A	Same as -vte\n");
-}
-
-static void cat_file(FILE* file) {
-    char c;
-    size_t read;
-    
-    size_t line = 1;
-    bool empty = true;
-    bool newline = true;
-    
-    while ((read = fread(&c, 1, 1, file)) != 0) {
-        if (c == '\n') {
-            if (empty && flags.number_lines) {
-                printf("\t%ld ", line);
-            }
-            if (flags.end_lines_dollar) {
-                printf("$");
-            }
-            line++;
-            newline = true;
-            empty = true;
-            goto print;
-        } else {
-            empty = false;
-        }
-
-        if (!newline) {
-            goto print;
-        }
-
-        if (!empty && (flags.number_non_empty || flags.number_lines)) {
-            printf("\t%ld ", line);
-            newline = false;
-        }
-    print:
-        if (!flags.change_non_print || printable(c)) {
-            if (flags.change_tabs && c == '\t') {
-                fwrite("^I", 1, 2, stdout);
-            } else {
-                fwrite(&c, 1, 1, stdout);
-            }
-        } else {
-            c |= '@';
-            fwrite(&c, 1, 1, stdout);
-        }
-    }
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'n':
-            flags.number_lines = true;
-            break;
-        case 'b':
-            flags.number_non_empty = true;
-            break;
-        case 'v':
-            flags.change_non_print = true;
-            break;
-        case 't':
-            flags.change_non_print = true;
-            flags.change_tabs = true;
-            break;
-        case 'e':
-            flags.change_non_print = true;
-            flags.end_lines_dollar = true;
-            break;
-        case 'A':
-            flags.change_non_print = true;
-            flags.change_tabs = true;
-            flags.end_lines_dollar = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-COMMAND(cat) {
-
-    int start;
-    int arg_len;
-    int i;
-
-    flags.number_lines = false;
-    flags.number_non_empty = false;
-    flags.change_non_print = false;
-    flags.change_tabs = false;
-    flags.end_lines_dollar = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    arg_len = argc - start;
-
-    if (arg_len < 1) {
-        cat_file(stdin);
-        return EXIT_SUCCESS;
-    }
-
-    for (i = start; i < argc; i++) {
-        FILE* in = get_file(argv[i], "r");
-        cat_file(in);
-        if (in != stdin)
-            fclose(in);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/cp.c b/src/commands/cp.c
deleted file mode 100644
index df88155..0000000
--- a/src/commands/cp.c
+++ /dev/null
@@ -1,240 +0,0 @@
-#include "../command.h"
-#include <dirent.h>
-#include <limits.h>
-#include <stdio.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-static struct {
-    bool recurse;
-    bool preserve;
-    bool sym_link;
-    bool hard_link;
-    bool verbose;
-} flags;
-
-static void help(void) {
-    printf("Usage: cp [-rplsv] SOURCE... DEST\n\n");
-    printf("Copy SOURCEs to DEST\n\n");
-    printf("\t-R,-r\tRecurse\n");
-    printf("\t-p\tPreserve file attributes if possible\n");
-    printf("\t-l,-s\tCreate (sym)links\n");
-    printf("\t-v\tVerbose\n");
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'R':
-        case 'r':
-            flags.recurse = true;
-            break;
-        case 'p':
-            flags.preserve = true;
-            break;
-        case 'l':
-            flags.hard_link = true;
-            flags.sym_link = false;
-            break;
-        case 's':
-            flags.sym_link = true;
-            flags.hard_link = false;
-            break;
-        case 'v':
-            flags.verbose = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-static bool copy_file(char* from, char* to) {
-    #define BS 1024
-    
-    FILE *from_f, *to_f;
-    char buf[BS];
-    int read;
-
-    from_f = get_file_s(from, "r");
-    if (from_f == NULL) { return false; }
-
-    to_f = get_file_s(to, "w");
-    if (to_f == NULL) { fclose(from_f); return false; }
-
-
-    while ((read = fread(buf, 1, BS, from_f)) > 0) {
-        fwrite(buf, 1, read, to_f);
-    }
-
-    if (flags.verbose) {
-        output("copied '%s'", from);
-    }
-
-    return true;
-}
-
-static bool symlink_file(char* from, char* to) {
-    if (symlink(from, to) < 0) {
-        error_s("failed to symlink '%s': %s", from, strerror(errno));
-        return false;
-    } else if (flags.verbose) {
-        output("symlinked '%s'", from);
-    }
-    return true;
-}
-
-static bool hardlink_file(char* from, char* to) {
-    if (link(from, to) < 0) {
-        error_s("failed to hardlink '%s': %s", from, strerror(errno));
-        return false;
-    } else if (flags.verbose) {
-        output("hardlinked '%s'", from);
-    }
-    return true;
-}
-
-static void run_copy(struct stat* s) {
-
-    char* from = get_path_buffer();
-    char* to = get_path_buffer_2();
-
-    bool result;
-    if (flags.sym_link) {
-        result = symlink_file(from, to);
-    } else if (flags.hard_link) {
-        result = hardlink_file(from, to);
-    } else {
-        result = copy_file(from, to);
-    }
-
-    if (!result) return;
-    if (!flags.preserve) return;
-
-    if (chmod(to, s->st_mode) < 0) {
-        error_s("cannot chmod '%s': %s", to, strerror(errno));
-        return;
-    }
-
-    if (chown(to, s->st_uid, s->st_gid) < 0) {
-        error_s("cannot chown '%s': %s", to, strerror(errno));
-        return;
-    }
-}
-
-static void cp_file(char* path);
-    
-static void cp_directory(struct stat* s) {
-    
-    DIR* d;
-    struct dirent* file;
-
-    if (!flags.recurse) {
-        error_s("-r not specified; omitting directory '%s'", get_path_buffer());
-        return;
-    }
-
-    if (mkdir(get_path_buffer_2(), s->st_mode) < 0 && errno != EEXIST) {
-        error_s("cannot create directory '%s': %s", get_path_buffer_2(), strerror(errno));
-        return;
-    }
-
-    d = opendir(get_path_buffer());
-
-    if (d == NULL) {
-        error_s("cannot open directory '%s': %s", get_path_buffer(), strerror(errno));
-        return;
-    }
-
-    while ((file = readdir(d)) != NULL) {
-        if (is_dot_dir(file->d_name)) continue;
-        cp_file(file->d_name);
-    }
-}
-
-static char* get_file_name(char* path) {
-    int last = 0;
-    int i = 0;
-    
-    if (path[0] == '\0') return path;
-    
-    while (true) {
-        if (path[i+1] == '\0') break;
-        if (path[i] == '/') {
-            last = i;
-        }
-        i++;
-    }
-
-    if (last == 0) return path;
-    else return path + last + 1;
-}
-
-static void cp_file(char* path) {
-    
-    int save = push_path_buffer(path);
-    int save2 = push_path_buffer_2(get_file_name(path));
-    
-    struct stat s;
-    if (lstat(get_path_buffer(), &s) < 0) {
-        pop_path_buffer(save);
-        error_s("cannot stat '%s': %s", get_path_buffer(), strerror(errno));
-        return;
-    }
-
-    if (S_ISDIR(s.st_mode)) {
-        cp_directory(&s);
-    } else {
-        run_copy(&s);
-    }
-    
-    pop_path_buffer(save);
-    pop_path_buffer_2(save2);
-}
-
-COMMAND(cp) {
-
-    int start, i;
-    struct stat s;
-
-    flags.hard_link = false;
-    flags.sym_link = false;
-    flags.preserve = false;
-    flags.recurse = false;
-    flags.verbose = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (argc - start < 2) {
-        global_help(help);
-    }
-
-    /* only when 2 args and first is a file, the 2nd will be a file */
-    if (argc - start == 2) {
-        struct stat s;
-        if (lstat(argv[start], &s) < 0) {
-            error("cannot stat '%s': %s", argv[start], strerror(errno));
-        }
-        push_path_buffer(argv[argc-2]);
-        push_path_buffer_2(argv[argc-1]);
-        if (!S_ISDIR(s.st_mode)) {
-            run_copy(&s);
-        } else {
-            cp_directory(&s);
-        }
-        return EXIT_SUCCESS;
-    }
- 
-    /* push directory */
-    push_path_buffer_2(argv[argc-1]);
-
-    if (lstat(get_path_buffer_2(), &s) < 0) {
-        error("target: '%s': %s", get_path_buffer_2(), strerror(errno));
-    }
-
-    for (i = start; i < argc - 1; i++) {
-        cp_file(argv[i]);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/dd.c b/src/commands/dd.c
deleted file mode 100644
index 1387317..0000000
--- a/src/commands/dd.c
+++ /dev/null
@@ -1,60 +0,0 @@
-#include "../command.h"
-
-static void help(void) {
-    printf("Usage: dd [if=FILE] [of=FILE] [bs=N] [count=N]\n\n");
-    printf("Copy a file with converting and formatting\n\n");
-    printf("\tif=FILE\t\tRead from FILE instead of stdin\n");
-    printf("\tof=FILE\t\tWrite to FILE instead of stdout\n");
-    printf("\tbs=N\t\tRead and write N bytes at a time\n");
-    printf("\tcount=N\t\tCopy only N input blocks\n");
-}
-
-COMMAND(dd) {
-
-    FILE* in_file = stdin;
-    FILE* out_file = stdout;
-    int bs = 1024;
-    int count = -1;
-    int i;
-    char* buffer;
-    size_t read;
-
-    parse_help(argc, argv, help);
-
-    for (i = 0; i < argc; i++) {
-        if (prefix("if=", argv[i])) {
-            char* path = argv[i] + 3;
-            in_file = get_file(path, "rb");
-        } else if (prefix("of=", argv[i])) {
-            char* path = argv[i] + 3;
-            out_file = get_file(path, "wb");
-        } else if (prefix("bs=", argv[i])) {
-            char* str = argv[i] + 3;
-            bs = get_number(str);
-            if (bs < 1) {
-                error("block size must be greater than 0");
-            }
-        } else if (prefix("count=", argv[i])) {
-            char* str = argv[i] + 6;
-            count = get_number(str);
-            if (count < 1) {
-                error("count must be greather than 0");
-            }
-        } else {
-            error("unkown option %s", argv[i]);
-        }
-    }
- 
-    buffer = malloc(bs);
-    
-    while ((read = fread(buffer, 1, bs, in_file)) != 0) {
-        fwrite(buffer, 1, read, out_file);
-        if (--count, count == 0) break;
-    }
-
-    free(buffer);
-    fclose(in_file);
-    fclose(out_file);
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/echo.c b/src/commands/echo.c
deleted file mode 100644
index fe70a6a..0000000
--- a/src/commands/echo.c
+++ /dev/null
@@ -1,104 +0,0 @@
-#include "../command.h"
-
-static struct {
-    bool escape_codes;
-    bool newline;
-} flags;
-
-static void print_with_escape_codes(const char* str) {
-    
-    size_t index = 0;
-    char n;
-
-    while (true) {
-        char c = str[index];
-        index++;
-
-        if (c == '\0') break;
-        if (c != '\\') {
-            putchar(c);
-            continue;
-        }
-
-        n = str[index];
-        index++;
-
-        switch (n) {
-            case '\\':
-                putchar('\\');
-                break;
-            case 'b':
-                putchar('\b');
-                break;
-            case 'c':
-                exit(EXIT_SUCCESS);
-            case 'n':
-                putchar('\n');
-                break;
-            case 'r':
-                putchar('\r');
-                break;
-            case 't':
-                putchar('\t');
-                break;
-            case 'v':
-                putchar('\v');
-                break;
-            default:
-                putchar(c);
-                putchar(n);
-        }
-    }
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'e':
-            flags.escape_codes = true;
-            break;
-        case 'E':
-            flags.escape_codes = false;
-            break;
-        case 'n':
-            flags.newline = false;
-            break;
-        default:
-            flags.newline = true;
-            flags.escape_codes = false;
-            return ARG_IGNORE;
-    };
-    return ARG_UNUSED;
-}
-
-COMMAND(echo) {
-
-    int start, i;
-
-    if (argc < 1) {
-        return EXIT_SUCCESS;
-    }
-
-    flags.escape_codes = false;
-    flags.newline = true;
-
-    start = parse_args(argc, argv, NULL, short_arg, NULL);
-
-    for (i = start; i < argc; i++) {
-         if (flags.escape_codes) {
-            print_with_escape_codes(argv[i]);
-        } else {
-            printf("%s", argv[i]);
-        }
-
-        if (i + 1 != argc) {
-            putchar(' ');
-        }
-    } 
-
-    if (flags.newline) {
-        putchar('\n');
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/ed.c b/src/commands/ed.c
deleted file mode 100644
index d7e8881..0000000
--- a/src/commands/ed.c
+++ /dev/null
@@ -1,917 +0,0 @@
-#include "../command.h"
-#include "../util//regex.h"
-
-#define INPUT_LEN 1024
-
-static char** lines = NULL;
-static unsigned long line_capacity;
-static unsigned long line_count;
-static unsigned long line_current;
-static bool pending_writes;
-static char* default_filename = NULL;
-static re_t last_regex = NULL;
-
-enum LineAddressType {
-    INDEX,
-    RANGE,
-    SET,
-    FREE
-};
-
-struct LineAddress {
-    enum LineAddressType type;
-    union {
-        struct {
-            long int i;
-        } index;
-        struct {
-            long int a;
-            long int b;
-        } range;
-        struct {
-            long int* b;
-            unsigned long c;
-            unsigned long s;
-        } set;
-    } data;
-    bool empty;
-};
-
-enum RegexDirection {
-    BEFORE,
-    AFTER,
-    ALL
-};
-
-static bool read_regex(char** end, re_t* regex, enum RegexDirection dir) {
-    char c;
-    char* index = *end;
-    char* regex_str = index;
-    while(true) {
-        c = *(index++);
-        if (c == '\0') {
-            error_s("missing regex after %c\n", dir == BEFORE ? '?' : '/');
-            return false;
-        }
-        if (c == (dir == BEFORE ? '?' : '/')) {
-            *(index - 1) = '\0';
-            break;
-        }
-    }
-    *regex = re_compile(regex_str);
-    last_regex = *regex;
-    *end = index;
-    return true;
-}
-
-static bool parse_regex(char** end, struct LineAddress* address, enum RegexDirection dir) {
-    re_t regex;
-    unsigned long cap, siz, i, until;
-    long int* buf;
-
-    if (!read_regex(end, &regex, dir)) return false;
-
-    cap = 8;
-    siz = 0;
-    buf = malloc(cap * sizeof(long int));
-
-    i = (dir == ALL ? 0 : line_current);
-    until = (dir == BEFORE ? 0 : line_count - 1);
-    for (; (dir == BEFORE ? i >= until : i < until); dir == BEFORE ? i-- : i++) {
-        int len;
-        if (re_matchp(regex, lines[i], &len) == -1) {
-            if (dir == BEFORE && i == 0) break;
-            continue;
-        }
-        if (cap == siz) {
-            cap *= 2;
-            buf = realloc(buf, cap * sizeof(long int));
-        }
-        buf[siz] = i;
-        siz++;
-        if (dir == BEFORE && i == 0) break;
-    }
-
-    address->empty = false;
-    address->type = SET;
-    address->data.set.s = siz;
-    address->data.set.c = cap;
-    address->data.set.b = buf;
-    return true;
-}
-
-static void free_address (struct LineAddress address) {
-    if (address.type != SET) return;
-    address.type = FREE;
-    free(address.data.set.b);
-}
-
-static void expand_buffer(long int** buf, unsigned long* cap, unsigned long* size) {
-    if (*cap == *size) {
-        *cap *= 2;
-        *buf = realloc(*buf, sizeof(long int) * *cap);
-    }
-}
-
-static bool parse_regex_lines(char** end, struct LineAddress* address) {
-    re_t regex;
-    unsigned long cap, siz;
-    long int* buf;
-    int len;
-    struct LineAddress addr;
-
-    if (!read_regex(end, &regex, ALL)) return false;
-
-    cap = 8;
-    siz = 0;
-    buf = malloc(cap * sizeof(long int));
-
-    addr = *address;
-    if (addr.type == INDEX) {
-        if (re_matchp(regex, lines[addr.data.index.i], &len) != -1) {
-            buf[0] = addr.data.index.i;
-            siz = 1;
-        }
-    } else if (addr.type == RANGE) {
-        long int i;
-        for (i = addr.data.range.a; i < addr.data.range.b; i++) {
-            if (re_matchp(regex, lines[i], &len) == -1) continue;
-            expand_buffer(&buf, &cap, &siz);
-            buf[siz] = i;
-            siz++;
-        }
-    } else if (addr.type == SET) {
-        unsigned long i;
-        for (i = 0; i < addr.data.set.s; i++) {
-            if (re_matchp(regex, lines[addr.data.set.b[i]], &len) == -1) continue;
-            expand_buffer(&buf, &cap, &siz);
-            buf[siz] = addr.data.set.b[i];
-            siz++;
-        }
-    }
-
-    free_address(*address);
-    address->empty = false;
-    address->type = SET;
-    address->data.set.s = siz;
-    address->data.set.c = cap;
-    address->data.set.b = buf;
-    return true;
-}
-
-static bool read_address(char** command, bool whitespace, struct LineAddress* a) {
-    char* index = *command;
-    struct LineAddress address;
-
-    char* end_pre;
-    long int n_pre;
-    char pre;
-
-    memset(&address, 0, sizeof(struct LineAddress));
-    
-    address.empty = false;
-    if (strlen(*command) < 1) {
-        address.type = INDEX;
-        address.data.index.i = line_current + 1;
-        if (line_current >= line_count) line_current = line_count - 1;
-        *a = address;
-        return true;
-    }
-
-    n_pre = strtol(index, &end_pre, 10) - 1;
-    if (end_pre == index) {
-        n_pre = -1;
-    } else {
-        if (n_pre < 0) {
-            error_s("input cannot be negative\n");
-            return false;
-        }
-        index = end_pre;
-    }
-    
-    pre = *(index++);
-    switch (pre) {
-        case '.':
-            address.type = INDEX;
-            address.data.index.i = line_current;
-            break;
-        case '$':
-            address.type = INDEX;
-            address.data.index.i = line_count - 1;
-            break;
-        case '-':
-        case '^': {
-            char* end;
-            long int n;
-
-            address.type = INDEX;
-            n = strtol(index, &end, 10) - 1;
-
-            if (n < 0) {
-                error_s("input cannot be negative\n");
-                return false;
-            }
-
-            if (index == end) {
-                address.data.index.i = line_current - 1;
-            } else {
-                address.data.index.i = line_current - n;
-            }
-
-            if (address.data.index.i < 0) {
-                error_s("line number %ld does not exist\n", address.data.index.i + 1);
-                return false;
-            }
-
-            break;
-        }
-        case '+': {
-            char* end;
-            long int n;
-
-            address.type = INDEX;
-            n = strtol(index, &end, 10) - 1;
-
-            if (n < 0) {
-                error_s("input cannot be negative\n");
-                return false;
-            }
-            if (index == end) {
-                address.data.index.i = line_current + 1;
-            } else {
-                address.data.index.i = line_current + n;
-            }
-            if (address.data.index.i >= (long int) line_count) {
-                error_s("line number %ld does not exist\n", address.data.index.i + 1);
-                return false;
-            }
-            break;
-        }
-        case '%':
-            address.type = RANGE;
-            address.data.range.a = 0;
-            address.data.range.b = line_count - 1;
-            break;
-        case ';':
-            address.type = RANGE;
-            address.data.range.a = line_current;
-            address.data.range.b = line_count - 1;
-            break;
-        case '/': 
-            if (!parse_regex(&index, &address, AFTER)) return false;
-            break;
-        case '?':
-            if (!parse_regex(&index, &address, BEFORE)) return false;
-            break;
-        default: {
-            index--;
-            if (n_pre == -1) {
-                address.type = INDEX;
-                address.data.index.i = line_current;
-                address.empty = true;
-                break;
-            } else if (whitespace) {
-                address.type = INDEX;
-                address.data.index.i = line_current + n_pre;
-            } else {
-                address.type = INDEX;
-                address.data.index.i = n_pre;
-            }
-            if (address.data.index.i < 0 || address.data.index.i >= (long int) line_count) {
-                error_s("line number %ld does not exist\n", address.data.index.i + 1);
-                return false;
-            }
-        }
-    }
-    *command = index;
-    *a = address;
-    return true;
-}
-
-static void free_data(bool all) {
-    if (lines != NULL) {
-        unsigned long i;
-        for (i = 0; i < line_count; i++) {
-            free(lines[i]);
-        }
-        free(lines);
-        lines = NULL;
-    }
-    if (all && default_filename != NULL) {
-        free(default_filename);
-        default_filename = NULL;
-    }
-}
-
-static void load_empty(void) {
-    free_data(false);
-
-    line_capacity = 8;
-    lines = malloc(sizeof(char*) * line_capacity);
-
-    line_count = 0;
-    line_current = 0;
-    pending_writes = false;
-}
-
-static void get_input(FILE* file, char*** buffer, unsigned long* capacity, unsigned long* size) {
-    unsigned long cap = 8;
-    unsigned long siz = 0;
-    char** buf = malloc(sizeof(char*) * cap);
-
-    char* line = NULL;
-    size_t offset = 0;
-    
-    clearerr(stdin);
-    while (getline(&line, &offset, file) != -1) {
-        if (cap == siz) {
-            cap *= 2;
-            buf = realloc(buf, sizeof(char*) * cap);
-        }
-        buf[siz] = line;
-        siz++;
-        line = NULL;
-    }
-
-    free(line);
-
-    *buffer = buf;
-    *capacity = cap;
-    *size = siz;
-}
-
-int ed_getline(char *buf, size_t size) {
-    size_t i = 0;
-    int ch;
-    clearerr(stdin);
-    while ((ch = getchar()) != EOF) {  /* Read until EOF ... */
-        if (i + 1 < size) {
-            buf[i++] = ch;
-        }
-        if (ch == '\n') {  /* ... or end of line */
-            break;  
-        }
-    } 
-    buf[i] = '\0';
-    if (i == 0) { 
-        return EOF;
-    }
-    return i;
-}
-
-static void load_file(FILE* file) {
-    free_data(false);
-    line_current = 0;
-    get_input(file, &lines, &line_capacity, &line_count);
-    if (file != stdin)
-        fclose(file);
-    
-}
-
-static bool check_if_sure(char* prompt) {
-    char buf[INPUT_LEN];
-
-    if (!pending_writes) {
-        return true;
-    }
-
-    printf("%s", prompt);
-    fflush(stdout);
-
-    if (ed_getline(buf, INPUT_LEN) == EOF) {
-        putchar('\n');
-        return false;
-    }
-
-    return prefix("y", buf);
-}
-
-static bool skip_whitespace(char** index) {
-    char c;
-    bool w = false;
-    while (c = **index, c == ' ' || c == '\t') { (*index)++; w = true; }
-    return w;
-}
-
-static void expand(unsigned long count) {
-    if (count < line_capacity) return;
-    line_capacity *= 2;
-    if (count > line_capacity) line_capacity = count;
-    lines = realloc(lines, line_capacity * sizeof(char*));
-}
-
-static void append_lines(unsigned long index, char** new, unsigned long new_len) {
-    if (new_len < 1) return;
-    pending_writes = true;
-    expand(line_count + new_len);
-    if (index + 1 <= line_count)
-        memmove(&lines[index+new_len], &lines[index], sizeof(char*) * (line_count - index));
-    memcpy(&lines[index], new, sizeof(char*) * new_len);
-    line_count += new_len;
-}
-
-static void delete_lines(unsigned long a, unsigned long b) {
-    unsigned long i;
-
-    if (b < a) return;
-    pending_writes = true;
-    
-    for (i = a; i <= b; i++) {
-        free(lines[i]);
-    }
-    if (b == line_count - 1) {
-        line_count = a;
-        return;
-    }
-    memmove(&lines[a], &lines[b+1], sizeof(char*) * (line_count - (b + 1)));
-    line_count -= (b - a) + 1;
-    line_current = a;
-    if (line_current >= line_count) line_current = line_count - 1;
-}
-
-static bool handle_append(struct LineAddress* address) {
-    char** buf;
-    unsigned long cap, size;
-
-    if (address->type != INDEX) {
-        error_s("append command requires index addressing\n");
-        return false;
-    }
-    
-    if (line_count == 0) {
-        address->data.index.i = -1;
-    }
-    
-    get_input(stdin, &buf, &cap, &size);
-    
-    if (size > 0) {
-        append_lines(address->data.index.i + 1, buf, size);
-        printf("ed: appened %lu lines\n", size);
-    }
-    
-    line_current += size;
-    free(buf);
-    return true;
-}
-
-static bool handle_delete(struct LineAddress* address) {
-    if (address->empty && address->data.index.i >= (long int) line_count) {
-        error_s("line number %ld does not exist\n", address->data.index.i + 1);
-        return false;
-    }
-
-    if (address->type == INDEX) {
-        delete_lines(address->data.index.i, address->data.index.i);
-        output("deleted line %ld\n", address->data.index.i+1);
-    } else if (address->type == RANGE) {
-        delete_lines(address->data.range.a, address->data.range.b);
-        output("deleted lines %ld-%ld\n", address->data.range.a+1, address->data.range.b+1);
-    } else if (address->type == SET) {
-        unsigned long i;
-        for (i = 0; i < address->data.set.s; i++) {
-            delete_lines(address->data.set.b[i], address->data.set.b[i]);
-        }
-        output("deleted %lu lines\n", address->data.set.s);
-    }
-    
-    return true;
-}
-
-static bool get_file_name(char** filename) {
-    size_t len = strlen(*filename);
-
-    if (len < 1 || (len == 1 && **filename == '\n')) {
-        if (default_filename == NULL) {
-            error_s("no default filename specified\n");
-            return false;
-        }
-        *filename = default_filename;
-    } else {
-        if ((*filename)[len - 1] == '\n') {
-            (*filename)[len - 1] = '\0';
-            len--;
-        }
-        if (default_filename != NULL) {
-            default_filename = realloc(default_filename, len + 1);
-        } else {
-            default_filename = malloc(len + 1);
-        }
-        memcpy(default_filename, *filename, len + 1);
-        *filename = default_filename;
-    }
-    return true;
-}
-
-static void write_file(char* filename, struct LineAddress* address, char* type) {
-    FILE* file;
-    int wrote;
-
-    if (line_count < 1) {
-        error_s("cannot write empty file\n");
-        return;
-    }
-    
-    if (!get_file_name(&filename)) return;
-    file = get_file_s(filename, type);
-    if (file == NULL) return;
-    
-    wrote = 0;
-    
-    if (address->empty) {
-        unsigned long i;
-        for (i = 0; i < line_count; i++) {
-            fprintf(file, "%s", lines[i]); 
-            wrote++;
-        }
-    } else if (address->type == INDEX) {
-        long int i = address->data.index.i;
-        fprintf(file, "%s", lines[i]); 
-        wrote++;
-    } else if (address->type == RANGE) {
-        long int i;
-        for (i = address->data.range.a; i < address->data.range.b; i++) {
-            fprintf(file, "%s", lines[i]); 
-            wrote++;
-        }
-    } else if (address->type == SET) {
-        unsigned long i;
-        for (i = 0; i < address->data.set.s; i++) {
-            fprintf(file, "%s", lines[address->data.set.b[i]]);
-            wrote++;
-        }
-    }
-
-    pending_writes = false;
-    fclose(file);
-    output("wrote %d lines from %s\n", wrote, filename);
-}
-
-static void read_file(char* filename) {
-    FILE* file;
-    char** buf;
-    long int line;
-    unsigned long capacity, size;
-
-    if (!get_file_name(&filename)) return;
-    file = get_file_s(filename, "r");
-    if (file == NULL) return;
-
-    capacity = 8;
-    size = 0;
-    buf = malloc(capacity * sizeof(char*));
-    get_input(file, &buf, &capacity, &size);
-
-    if (size < 1) {
-        free(buf);
-        error_s("attempted to read a empty file\n");
-        return;
-    }
-
-    line = -1;
-    if (line_count > 0) {
-        line = line_count - 1;
-    }
-
-    append_lines(line, buf, size);
-    free(buf);
-    output("read and appended %lu lines from %s\n", size, filename);
-}
-
-static void expand_string(char** buf, int* capacity, int* size, char* text, int len) {
-    if (*size + len >= *capacity) {
-        *capacity *= 2;
-        if (*capacity < *size + len) *capacity = *size + len;
-        *buf = realloc(*buf, *capacity);
-    }
-    memcpy(*buf + *size, text, len);
-    *size += len;
-}
-
-static int substute_string(long int index, long int matches, re_t regex, char* sub, int sub_len) {
-    int capacity = 8;
-    int size = 0;
-    char* buf = malloc(sizeof(char) * capacity);
-    long int left;
-
-    int offset = 0;
-    int matches_found = 0;
-    while(true) {
-        int distance, len;
-        
-        if (lines[index][offset] == '\0') break;
-        
-        if (matches_found >= matches && matches > 0) break;
-        
-        if ((distance = re_matchp(regex, &lines[index][offset], &len)) == -1) {
-            break;
-        }
-        
-        if (distance > 0) {
-            expand_string(&buf, &capacity, &size, &lines[index][offset], distance);
-        }
-
-        expand_string(&buf, &capacity, &size, sub, sub_len);
-        offset += len + distance;
-        matches_found++;
-    }
-
-    left = strlen(lines[index] + offset);
-    expand_string(&buf, &capacity, &size, &lines[index][offset], left + 1);
-
-    free(lines[index]);
-    lines[index] = buf;
-    return matches_found;
-}
-
-static void prompt(void) {
-    char buf[INPUT_LEN];
-    char* index;
-    char cmd;
-    bool whitespace, linenumbers;
-    struct LineAddress address;
-    
-    printf(": ");
-    fflush(stdout);
-
-    if (ed_getline(buf, INPUT_LEN) == EOF) { putchar('\n'); return; }
-    if (buf[0] == '\0') { putchar('\n'); return; }
-
-    index = &buf[0];
-    whitespace = skip_whitespace(&index);
-
-    if (!read_address(&index, whitespace, &address)) return;
-
-    cmd = *(index++);
-    
-    if (cmd == ',') {
-        struct LineAddress address2;
-        
-        if (address.type != INDEX) {
-            error_s("comma range addressing requires two index addresses\n");
-            free_address(address);
-            return;
-        }
-        
-        whitespace = skip_whitespace(&index);
-        
-        if (!read_address(&index, whitespace, &address2)) {
-            free_address(address);
-            return;
-        }
-        
-        if (address2.type != INDEX) {
-            error_s("comma range addressing requires two index addresses\n");
-            free_address(address);
-            free_address(address2);
-            return;
-        }
-        
-        address.type = RANGE;
-        address.data.range.a = address.data.index.i; /* cursed */
-        address.data.range.b = address2.data.index.i;
-
-        cmd = *(index++);
-    }
-
-    if (address.type == RANGE && address.data.range.a > address.data.range.b) {
-        error_s("range addressing must be in ascending order\n");
-        free_address(address);
-        return;
-    }
-
-    linenumbers = false;
-
-test:
-    switch (cmd) {
-        case '\0':
-        case '\n':
-            if (address.empty) {
-                if (line_current == line_count) {
-                    error_s("line number %ld does not exist\n", line_current + 1);
-                    break;
-                } else if (line_current + 1 == line_count) {
-                    error_s("line number %ld does not exist\n", line_current + 2);
-                    break;
-                } else {
-                    line_current++;
-                }
-                printf("%s", lines[line_current]);
-                break;
-            }
-            if (address.type == INDEX) {
-                line_current = address.data.index.i;
-            } else if (address.type == RANGE) {
-                line_current = address.data.range.b;
-            } else if (address.type == SET) {
-                error_s("unexpected range addressing\n");
-                break;
-            }
-            printf("%s", lines[line_current]);
-            break;
-        case 'a':
-            handle_append(&address);
-            break;
-        case 'd':
-            handle_delete(&address);
-            break;
-        case 'c':
-            if (!handle_delete(&address)) { break; }
-            address.type = INDEX;
-            address.data.index.i = line_current - 1;
-            handle_append(&address);
-            break;
-        case 'n':
-            linenumbers = true;
-            __attribute__((fallthrough));
-        case 'p':
-            if (address.empty && address.data.index.i >= (long int) line_count) {
-                error_s("line number %ld does not exist\n", address.data.index.i + 1);
-                break;
-            }
-            if (address.type == INDEX) {
-                if (linenumbers) printf("%ld\t", address.data.index.i + 1);
-                printf("%s", lines[address.data.index.i]);
-            } else if (address.type == RANGE) {
-                long int i;
-                for (i = address.data.range.a; i <= address.data.range.b; i++) {
-                    if (linenumbers) printf("%ld\t", i + 1);
-                    printf("%s", lines[i]);
-                }
-            } else if (address.type == SET) {
-                unsigned long i;
-                for (i = 0; i < address.data.set.s; i++) {
-                    if (linenumbers) printf("%ld\t", address.data.set.b[i] +1);
-                    printf("%s", lines[address.data.set.b[i]]);
-                }
-            }
-            break;
-        case 'q':
-            if (!check_if_sure("Quit for sure? ")) break;
-            __attribute__((fallthrough));
-        case 'Q':
-            free_address(address);
-            free_data(true);
-            exit(EXIT_SUCCESS);
-            break;
-        case 'g':
-            skip_whitespace(&index);
-            free_address(address);
-            if (*(index++) != '/') {
-                error_s("unexpected character at start of regex\n");
-                break;
-            }
-            if (!parse_regex(&index, &address, ALL)) { return; }
-            skip_whitespace(&index);
-            if (*index == '\n' || *index == '\0') {
-                cmd = 'p';
-            } else {
-                cmd = *(index++);
-            }
-            goto test;
-            break;
-        case 's': {
-            char* replace = index;
-            long int matches, sub_len, matches_found;
-            unsigned long i;
-            
-            skip_whitespace(&index);
-            if (*(index++) != '/') {
-                error_s("unexpected character at start of regex\n");
-                break;
-            }
-            if (!parse_regex_lines(&index, &address)) { return; }
-            while(*index != '\0' && *index != '/') index++;
-            if (*index != '/') {
-                error_s("/ missing after %c\n", *index);
-                break;
-            }
-            if (address.data.set.s < 1) {
-                error_s("no matches found\n");
-                break;
-            }
-            *(index++) = '\0';
-            if (*index == '\0' || *index == '\n') {
-                matches = 1;
-            } else if (*index == 'g') {
-                matches = -1;
-            } else {
-                char* end;
-                matches = strtol(index, &end, 10);
-                if (end == index) {
-                    error_s("invalid number: %s\n", index);
-                    break;
-                }
-                if (matches < 1) {
-                    error_s("matches cannot be less than 1\n");
-                    break;
-                }
-            }
-            sub_len = strlen(replace);
-            matches_found = 0;
-            
-            for (i = 0; i < address.data.set.s; i++) {
-                matches_found += substute_string(address.data.set.b[i], matches, last_regex, replace, sub_len);
-            }
-            output("replaced %ld matches over %ld lines\n", matches_found, address.data.set.s);
-            pending_writes = true;
-            break;
-        }
-        case 'w': {
-            bool quit = false;
-            if (*index == 'q') {
-                index++;
-                quit = true;
-            }
-            skip_whitespace(&index);
-            write_file(index, &address, "w");
-            if (quit) {
-                free_address(address);
-                free_data(true);
-                exit(EXIT_SUCCESS);
-            }
-            break;
-        }
-        case 'r': {
-            skip_whitespace(&index);
-            read_file(index);
-            break;
-        }
-        case 'e': 
-            if (!check_if_sure("Load new file for sure? ")) break;
-            __attribute__((fallthrough));
-        case 'E': {
-            char* filename;
-            FILE* file;
-
-            skip_whitespace(&index);
-            
-            filename = index;
-            if(!get_file_name(&filename)) break;
-            
-            file = get_file_s(filename, "r");
-            if (file == NULL) break;
-            
-            load_file(file);
-            break;
-        }
-        case 'W':
-            skip_whitespace(&index);
-            write_file(index, &address, "a");
-            break;
-        case '=':
-            printf("%ld\n", line_current + 1);
-            break;
-        default:
-            error_s("unimplemented command\n");
-            break;
-    }
-
-    free_address(address);
-
-}
-
-static void prompt_loop(void) {
-    while (true) {
-        prompt();
-    }
-}
-
-static void help(void) {
-    printf("Usage: ed [FILE]\n\n");
-    printf("Edit a given [FILE] or create a new text file\n\n");
-    printf("\t(.,.)\tnewline\t\tgo to address line and print\n");
-    printf("\t(.)\ta\t\tappend new data after given line\n");
-    printf("\t(.,.)\tc\t\treplace given lines with new data\n");
-    printf("\t(.,.)\td\t\tdelete given lines\n");
-    printf("\t\te file\t\tdelete current buffer and edit file\n");
-    printf("\t\tE file\t\tdelete current buffer and edit file unconditionally\n");
-    printf("\t\tg/re/command\tgrep all lines with regex and run command on matches\n");
-    printf("\t(.,.)\tn\t\tprint given lines along with their line numbers\n");
-    printf("\t(.,.)\tp\t\tprint given lines\n");
-    printf("\t\tq\t\tquit file\n");
-    printf("\t\tQ\t\tquit file unconditionally\n");
-    printf("\t($)\tr file\t\tread file and append to end of buffer\n");
-    printf("\t(.,.)\ts/re/replace/\treplace the first match on each matching line\n");
-    printf("\t(.,.)\ts/re/replace/g\treplace all matches on each matching line\n");
-    printf("\t(.,.)\ts/re/replace/n\treplace n matches on each matching line\n");
-    printf("\t(.,.)\tw file\t\twrite contents of lines to file\n");
-    printf("\t(.,.)\twq file\t\twrite contents of lines to file then quit\n");
-    printf("\t(.,.)\tW file\t\tappend contents of line to file\n");
-    printf("\t\t=\t\tprint current line number\n");
-}
-
-COMMAND(ed) {
-
-    parse_help(argc, argv, help);
-
-    if (argc < 1) {
-        load_empty();
-        prompt_loop();
-    } else {
-        FILE* file = get_file(argv[0], "r");
-        load_file(file);
-        get_file_name(&argv[0]);
-        prompt_loop();
-    }
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/grep.c b/src/commands/grep.c
deleted file mode 100644
index 4062734..0000000
--- a/src/commands/grep.c
+++ /dev/null
@@ -1,265 +0,0 @@
-#include "../command.h"
-#include <stdio.h>
-
-static struct {
-    bool filename_prefix;
-    bool never_file_prefix;
-    bool line_number;
-    bool only_matching_names;
-    bool only_non_matching_names;
-    bool only_line_count;
-    bool only_matching_part;
-    bool quiet;
-    bool inverse;
-    bool ignore_case;
-    bool is_regex;
-} flags;
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'H':
-            flags.filename_prefix = true;
-            break;
-        case 'h':
-            flags.never_file_prefix = true;
-            break;
-        case 'n':
-            flags.line_number = true;
-            break;
-        case 'l':
-            flags.only_matching_names = true;
-            break;
-        case 'L':
-            flags.only_non_matching_names = true;
-            break;
-        case 'c':
-            flags.only_line_count = true;
-            break;
-        case 'o':
-            flags.only_matching_part = true;
-            break;
-        case 'q':
-            flags.quiet = true;
-            break;
-        case 'v':
-            flags.inverse = true;
-            break;
-        case 'i':
-            flags.ignore_case = true;
-            break;
-        case 'F':
-            flags.is_regex = false;
-            break;
-        case 'E':
-            flags.is_regex = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-static void help(void) {
-    printf("Usage: grep [-HhlLoqviFE] [-m N] PATTERN [FILE]...\n");
-    printf("Search for PATTERN in FILEs (or stdin)\n");
-    printf("\t-H\tAdd 'filename:' prefix\n");
-    printf("\t-h\tDo not add 'filename:' prefix\n");
-    printf("\t-n\tAdd 'line_no:' prefix\n");
-    printf("\t-l\tShow only names of files that match\n");
-    printf("\t-L\tShow only names of files that don't match\n");
-    printf("\t-c\tShow only count of matching lines\n");
-    printf("\t-o\tShow only the matching part of line\n");
-    printf("\t-q\tQuiet. Return 0 if PATTERN is found, 1 otherwise\n");
-    printf("\t-v\tSelect non-matching lines\n");
-    printf("\t-i\tIgnore case\n");
-    printf("\t-F\tPATTERN is a literal (not regexp)\n");
-    printf("\t-E\tPATTERN is an extended regexp\n");
-}
-
-static bool match_regex(char** string, re_t pattern) {
-    int len;
-    int index;
-    if ((index = re_matchp(pattern, *string, &len)) < 0) return false;
-    if (flags.only_matching_part) {
-        (*string) += index;
-        (*string)[len] = '\0';
-    }
-    return true;
-}
-
-static bool match_literal(char** string, char* pattern) {
-    char* match = *string;
-    size_t match_len = strlen(match);
-    size_t pattern_len = strlen(pattern);
-    size_t i;
-
-    if (match_len < pattern_len) return false;
-
-    for (i = 0; i < match_len - pattern_len + 1; i++) {
-        if (
-            (!flags.ignore_case && strncmp(match + i, pattern, pattern_len) == 0) ||
-            (flags.ignore_case && strncasecmp(match + i, pattern, pattern_len) == 0)
-        ) {
-            if (flags.only_matching_part) {
-                *string = (*string) + i;
-                (*string)[pattern_len] = '\0';
-            }
-            return true;
-        }
-    }   
-
-    return false;
-}
-
-static bool match(char** string, void* pattern) {
-    bool result;
-    if (flags.is_regex) {
-        result =  match_regex(string, (re_t) pattern);
-    } else {
-        result = match_literal(string, (char*) pattern);
-    }
-    return (flags.inverse ? !result : result);
-}
-
-static bool match_any(char* path, void* pattern) {
-    FILE* file;
-    char* buf = NULL;
-    size_t offset;
-    bool matched = false;
-    int read;
-    
-    file = get_file_s(path, "r");
-    if (file == NULL) return false;
-
-    while ((read = getline(&buf, &offset, file)) > 0) {
-        char* save = buf;
-        if (buf[read-1] == '\n') buf[read-1] = '\0';
-        if (match(&save, pattern)) {
-            matched = true;
-            break;
-        }
-    }
-
-    if (buf != NULL) free(buf);
-
-    return matched;
-}
-
-static bool match_file(char* path, void* pattern, bool many) {
-    FILE* file;
-    char* buf = NULL;
-    size_t offset;
-    int num_matched = 0;
-    int line_num = 0;
-    int read;
-
-    file = get_file_s(path, "r");
-    if (file == NULL) return false;
-
-    while((read = getline(&buf, &offset, file)) > 0) {
-        char* matched = buf;
-        
-        if (buf[read-1] == '\n') buf[read-1] = '\0';
-        line_num++;
-        
-        if (!match(&matched, pattern)) {
-            continue;
-        }
-        
-        num_matched++;
-        
-        if (flags.only_line_count || flags.quiet) continue;
-        
-        if ((many || flags.filename_prefix) && !flags.never_file_prefix) {
-            print_file_path(path);
-            putchar(':');
-        }
-        
-        if (flags.line_number) {
-            printf("%d:", line_num);
-        }
-        
-        if (flags.only_matching_part) {
-            printf("%s\n", matched);
-        } else {
-            printf("%s\n", buf);
-        }
-    }
-
-    if (!flags.quiet && flags.only_line_count) {
-        if ((many || flags.filename_prefix) && !flags.never_file_prefix) {
-            print_file_path(path);
-            putchar(':');
-        }
-        printf("%d\n", num_matched);
-    }
-
-    if (buf != NULL) free(buf);
-
-    return num_matched != 0;
-}
-
-static void* compile(char* pattern) {
-    if (flags.is_regex) {
-        return re_compile(pattern);
-    } else {
-        return pattern;
-    }
-}
-
-static bool run_match(char* path, void* pattern, bool many) {
-    bool result;
-    if (flags.only_matching_names || flags.only_non_matching_names) {
-        result = match_any(path, pattern);
-        if (flags.only_non_matching_names) result = !result;
-        if (result && !flags.quiet) {
-            print_file_path(path);
-            putchar('\n');
-        }
-        return result;
-    } else {
-        return match_file(path, pattern, many);
-    }
-}
-
-COMMAND(grep) {
-
-    int start, i;
-    char* pattern;
-    bool many, ok;
-    void* compiled;
-
-    flags.only_matching_part = false;
-    flags.only_non_matching_names = false;
-    flags.only_matching_names = false;
-    flags.only_line_count = false;
-    flags.quiet = false;
-    flags.is_regex = true;
-    flags.line_number = false;
-    flags.never_file_prefix = false;
-    flags.filename_prefix = false;
-    flags.inverse = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (argc - start < 1) global_help(help);
-
-    pattern = argv[start++];
-        
-    many = argc - start > 0;
-    ok = false;
-
-    compiled = compile(pattern);
-    if (run_match("-", compiled, many)) ok = true;
-
-    for (i = start; i < argc; i++) {
-        if (run_match(argv[i], compiled, many)) ok = true;
-    }
-
-    if (flags.quiet) {
-        return ok ? EXIT_SUCCESS : EXIT_FAILURE;
-    } else {
-        return EXIT_SUCCESS;
-    }
-}
diff --git a/src/commands/groups.c b/src/commands/groups.c
deleted file mode 100644
index bd2e5f9..0000000
--- a/src/commands/groups.c
+++ /dev/null
@@ -1,42 +0,0 @@
-#include "../command.h"
-
-#include <grp.h>
-#include <pwd.h>
-
-COMMAND_EMPTY(groups) {
-
-    uid_t uid;
-    int ngroups, i;
-    gid_t* groups;
-    struct passwd* pw;
-
-    uid = getuid();
-    
-    pw = getpwuid(uid);
-    if(pw == NULL){
-        error("failed to fetch groups: %s", strerror(errno));
-    }
-    
-    ngroups = 0;
-    getgrouplist(pw->pw_name, pw->pw_gid, NULL, &ngroups);
-    
-    groups = malloc(sizeof(gid_t) * ngroups);
-    getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
-   
-    for (i = 0; i < ngroups; i++){
-        struct group* gr = getgrgid(groups[i]);
-
-        if(gr == NULL) {
-            free(groups);
-            error("failed to fetch groups: %s", strerror(errno));
-        }
-
-        printf("%s ",gr->gr_name);
-    }
-
-    printf("\n");
-
-    free(groups);
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/head.c b/src/commands/head.c
deleted file mode 100644
index da8b9b3..0000000
--- a/src/commands/head.c
+++ /dev/null
@@ -1,138 +0,0 @@
-#include "../command.h"
-
-static struct {
-    int count;
-    bool lines;
-    bool print_headers;
-    bool dont_print_headers;
-} flags;
-
-static void head_file_lines(FILE* file) {
-    size_t len = 0;
-    char* line = NULL;
-
-    int count = flags.count;
-    while(count > 0 && getline(&line, &len, file) != -1) {
-        printf("%s", line);
-        count--;
-    }
-
-    free(line);
-    fclose(file);
-}
-
-static void head_file_chars(FILE* file) {
-    char c;
-    int count = flags.count;
-    while(count > 0 && (c = getc(file)) != EOF) {
-        putchar(c);
-        count--;
-    }
-
-    fclose(file);
-}
-
-static void help(void) {
-    printf("Usage: head [OPTIONS] [FILE]...\n\n");
-    printf("Print first 10 lines of FILEs (or stdin)\n");
-    printf("With more than one FILE, precede each with a filename header.\n\n");
-    printf("\t-c [+]N[bkm]\tPrint first N bytes\n");
-	printf("\t-n N[bkm]\tPrint first N lines\n");
-	printf("\t\t\t(b:*512 k:*1024 m:*1024^2)\n");
-	printf("\t-q\t\tNever print headers\n");
-	printf("\t-v\t\tAlways print headers\n");
-}
-
-static void print_header(char* path, bool many) {
-    if (flags.dont_print_headers) return;
-    if (!many && !flags.print_headers) return;
-    if (streql("-", path)) {
-        printf("\n==> standard input <==\n");
-    } else {
-        printf("\n=>> %s <==\n", path);
-    }
-}
-
-static void head_file(char* path, bool many) {
-    FILE* file = get_file(path, "r");
-    print_header(path, many);
-    if (flags.lines) {
-        head_file_lines(file);
-    } else {
-        head_file_chars(file);
-    }
-}
-
-static int short_arg(char c, char* next) {
-    switch(c) {
-        case 'c': {
-            long int bkm;
-
-            flags.lines = false;
-            
-            check_arg(next);
-            bkm = get_blkm(next);
-            
-            if (bkm < 1) {
-                error("bkm cannot be less than 1");
-            }
-            
-            flags.count = bkm;
-            return ARG_USED;
-        }
-        case 'n': {
-            long int bkm;
-
-            flags.lines = true;
-            
-            check_arg(next);
-            bkm = get_blkm(next);
-            
-            if (bkm < 1) {
-                error("bkm cannot be less than 1");
-            }
-            
-            flags.count = bkm;
-            return ARG_USED;
-        }
-        case 'q':
-            flags.dont_print_headers = true;
-            break;
-        case 'v':
-            flags.print_headers = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-COMMAND(head) {
-
-    int start, count, i;
-
-    flags.count = 10;
-    flags.lines = true;
-    flags.print_headers = false;
-    flags.dont_print_headers = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    count = argc - start;
-
-    if (count < 1) {
-        head_file_lines(stdin);
-        return EXIT_SUCCESS;
-    }
-
-    if (count == 1) {
-        head_file(argv[start], false);
-        return EXIT_SUCCESS;
-    }
-    
-    for (i = 0; i < count; i++) {
-        head_file(argv[start + i], true);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/id.c b/src/commands/id.c
deleted file mode 100644
index 3bef4f6..0000000
--- a/src/commands/id.c
+++ /dev/null
@@ -1,53 +0,0 @@
-#include "../command.h"
-
-#include <grp.h>
-#include <pwd.h>
-
-COMMAND_EMPTY(user_id) {
-    
-    uid_t uid;
-    gid_t gid, *groups;
-    int ngroups, i;
-    struct passwd* pw;
-    struct group* ugr;
-
-    uid = getuid();
-    gid = getgid();
-    
-    pw = getpwuid(uid);
-    if(pw == NULL){
-        error("failed to fetch groups: %s", strerror(errno));
-    }
-    
-    ngroups = 0;
-    getgrouplist(pw->pw_name, pw->pw_gid, NULL, &ngroups);
-    
-    groups = malloc(sizeof(gid_t) * ngroups);
-    getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
-   
-    ugr = getgrgid(gid);
-    printf("uid=%d(%s) gid=%d(%s) ",
-           uid, ugr->gr_name, gid, ugr->gr_name);
-    
-    if (ngroups > 0) {
-        printf("groups=");
-    }
-
-    for (i = 0; i < ngroups; i++){
-        struct group* gr = getgrgid(groups[i]);
-        if(gr == NULL) {
-            free(groups);
-            error("failed to fetch groups: %s", strerror(errno));
-        }
-        
-        printf("%d(%s)", gr->gr_gid, gr->gr_name);
-        
-        if (i + 1 < ngroups) putchar(',');
-    }
-
-    printf("\b\n");
-
-    free(groups);
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/ls.c b/src/commands/ls.c
deleted file mode 100644
index e8d58d0..0000000
--- a/src/commands/ls.c
+++ /dev/null
@@ -1,552 +0,0 @@
-#include "../command.h"
-
-#include <grp.h>
-#include <pwd.h>
-#include <dirent.h>
-#include <ftw.h>
-#include <limits.h>
-#include <string.h>
-
-#define FILE_COLOR      ANSCII BLACK COLOR
-#define DIR_COLOR       ANSCII BOLD NEXT NORMAL BLUE COLOR
-#define DIR_COLOR_EXEC  ANSCII BACKGROUND GREEN  NEXT NORMAL BLACK COLOR
-#define LINK_COLOR      ANSCII BOLD NEXT NORMAL TURQUOISE COLOR
-#define SET_UID_COLOR   ANSCII BACKGROUND RED NEXT NORMAL WHITE COLOR
-#define SET_GID_COLOR   ANSCII BACKGROUND YELLOW NEXT NORMAL BLACK COLOR
-#define EXEC_COLOR      ANSCII BOLD NEXT NORMAL GREEN COLOR
-#define BLK_COLOR       ANSCII BOLD NEXT NORMAL YELLOW COLOR
-#define SOCK_COLOR      ANSCII BOLD NEXT NORMAL MAGENTA COLOR
-
-static struct {
-    bool hidden;
-    bool hide_dot;
-    bool more_info;
-    bool one_column;
-    bool recurse;
-    enum When colored;
-} flags;
-
-struct FileInfo {
-    struct passwd* usr;
-    struct group* grp;
-    char* name;
-    char date[13];
-    char mode[11];
-    char size[5];
-    int links;
-    int bytes;
-    bool set_uid;
-    bool set_gid;
-    bool exec;
-    unsigned char type;
-};
-
-struct FileListInfo {
-    int max_link;
-    int max_usr;
-    int max_grp;
-    int max_size;
-    int max_name;
-    int total_len;
-    int total_size;
-};
-
-static DIR* get_directory(char* path) {
-    DIR* d = opendir(path);
-    if (d == NULL) {
-        if (errno == ENOTDIR) {
-            error_s("`%s` is a a file\n", path);
-        } else {
-            error_s("failed to open directory '%s': %s\n", path, strerror(errno));
-        }
-    }
-    return d;
-}
-
-static bool get_file_info(const char* file_name, struct FileInfo* info) {
-
-    uid_t uid;
-    gid_t gid;
-    int save, ty;
-    struct stat s;
-    size_t file_len;
-
-    uid = getuid();
-    gid = getgid();
-
-    memset(&s, 0, sizeof(struct stat));
-
-    save = push_path_buffer(file_name);
-
-    if (lstat(get_path_buffer(), &s) < 0) {
-        error_s("failed to read file '%s': %s\n", get_path_buffer(), strerror(errno));
-        pop_path_buffer(save);
-        return false;
-    }
-
-    ty = (s.st_mode & S_IFMT) >> 12;
-    
-    info->set_uid = false;
-    info->set_gid = false;
-    info->exec = false;
-
-    switch (ty) {
-        case DT_BLK:
-            info->mode[0] = 'b';
-            break;
-        case DT_CHR:
-            info->mode[0] = 'c';
-            break;
-        case DT_DIR:
-            info->mode[0] = 'd';
-            break;
-        case DT_FIFO:
-            info->mode[0] = 'f';
-            break;
-        case DT_LNK:
-            info->mode[0] = 'l';
-            break;
-        case DT_SOCK:
-            info->mode[0] = 's';
-            break;
-        case DT_UNKNOWN:
-            info->mode[0] = 'u';
-            break;
-        case DT_WHT:
-            info->mode[0] = 'w';
-            break;
-        default:
-            info->mode[0] = '-';
-            break;
-    }
-    
-    info->mode[1] = (s.st_mode & S_IRUSR) ? 'r' : '-';
-    info->mode[2] = (s.st_mode & S_IWUSR) ? 'w' : '-';
-    if (s.st_mode & S_IXUSR) {
-        if (s.st_mode & S_ISUID) {
-            info->mode[3] = 's';
-            info->set_uid = true;
-        } else {
-            info->mode[3] = 'x';
-        }
-        if (!info->exec) info->exec = s.st_uid == uid;
-    } else {
-        info->mode[3] = '-';
-    }
-
-    info->mode[4] = (s.st_mode & S_IRGRP) ? 'r' : '-';
-    info->mode[5] = (s.st_mode & S_IWGRP) ? 'w' : '-';
-    if (s.st_mode & S_IXGRP) {
-        if (s.st_mode & S_ISGID) {
-            info->mode[6] = 's';
-            info->set_gid = true;
-        } else {
-            info->mode[6] = 'x';
-        }
-        if (!info->exec) info->exec = s.st_gid == gid;
-    } else {
-        info->mode[6] = '-';
-    }
-
-    info->mode[7] = (s.st_mode & S_IROTH) ? 'r' : '-';
-    info->mode[8] = (s.st_mode & S_IWOTH) ? 'w' : '-';
-    if (s.st_mode & S_IXOTH) {
-        info->mode[9] = 'x';
-        info->exec = true;
-    } else {
-        info->mode[9] = '-';
-    }
-
-    info->mode[10] = '\0';
-
-    info->usr = getpwuid(s.st_uid);
-    if (info->usr == NULL) {
-        error_s("failed to get user from `%s`\n", get_path_buffer());
-        pop_path_buffer(save);
-        return false;
-    }
-
-    info->grp = getgrgid(s.st_gid);
-    if (info->grp == NULL) {
-        error_s("failed to get user from `%s`\n", get_path_buffer());
-        pop_path_buffer(save);
-        return false;
-    }
-
-    info->links = s.st_nlink;
-    info->type = ty;
-
-    file_len = strlen(file_name) + 1;
-    info->name = malloc(file_len);
-    memcpy(info->name, file_name, file_len);
-
-    print_file_size(s.st_size, info->size);
-    print_date_time(s.st_mtim.tv_sec + s.st_mtim.tv_nsec / 1000000000, info->date);
-
-    info->bytes = (s.st_size + s.st_blksize - 1) / s.st_blksize;
-
-    pop_path_buffer(save);
-    return true;
-}
-
-static char* get_file_color(struct FileInfo* info) {
-    char* color;
-    if (info->type == DT_DIR) {
-        if (info->mode[8] == 'w') {
-            color = DIR_COLOR_EXEC;
-        } else {
-            color = DIR_COLOR;
-        }
-    } else if (info->type == DT_LNK) {
-        color = LINK_COLOR;
-    } else if (info->type == DT_SOCK) {
-        color = SOCK_COLOR;
-    } else if (
-        info->type == DT_CHR || 
-        info->type == DT_BLK
-    ) {
-        color = BLK_COLOR;
-    } else {
-        if (info->set_uid) {
-            color = SET_UID_COLOR;
-        } else if (info->set_gid) {
-            color = SET_GID_COLOR;
-        } else if (info->exec) {
-            color = EXEC_COLOR;
-        } else {
-            color = FILE_COLOR;
-        }
-    }
-    return color;
-}
-
-static void list_files(struct FileInfo* files, int file_len, struct FileListInfo info) {
-    
-    struct winsize w;
-    char* color;
-    int column_width, row_count, i;
-
-    if (flags.more_info) {
-        char total[13];
-        print_file_size(info.total_size, total);
-        printf("total %s\n", total);
-    }
-
-    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
-
-    if (!isatty(1)) {
-        flags.one_column = true;
-        if (flags.colored == AUTO)
-            flags.colored = NO;
-    }
-
-    column_width = info.max_name + 1;
-    row_count = w.ws_col / column_width;
-
-    for (i = 0; i < file_len; i++) {
-        struct FileInfo finfo = files[i];
-        color = get_file_color(&finfo);
-        if (flags.more_info) {
-            printf("%s %*d %*s %*s %*s %s %s%s%s", 
-                finfo.mode, 
-                info.max_link,
-                finfo.links,
-                info.max_usr,
-                finfo.usr->pw_name,
-                info.max_grp,
-                finfo.grp->gr_name, 
-                info.max_size,
-                finfo.size, 
-                finfo.date,
-                flags.colored != NO ? color : "",
-                finfo.name,
-                flags.colored != NO ? "\x1b[0m" : ""
-            );
-            if (finfo.type == DT_LNK) {
-                int save = push_path_buffer(finfo.name);
-
-                char lnk[PATH_MAX];
-                ssize_t n;
-                if ((n = readlink(get_path_buffer(), lnk, PATH_MAX)) != -1) {
-                    printf(" -> %.*s\n", (int)n, lnk);
-                } else {
-                    putchar('\n');
-                }
-
-                pop_path_buffer(save); 
-            } else {
-                putchar('\n');
-            }
-        } else if (flags.one_column) {
-            printf("%s%s%s\n", flags.colored != NO ? color : "", finfo.name, flags.colored != NO ? "\x1b[0m" : "");
-        } else {
-            if (info.total_len > w.ws_col) {
-                if (i != 0 && i % row_count == 0) putchar('\n');
-                printf("%s%*s%s", flags.colored != NO ? color : "", -column_width, 
-                       finfo.name, flags.colored != NO ? "\x1b[0m" : "");
-            } else {
-                printf("%s%s%s  ", flags.colored != NO ? color : "", finfo.name,
-                       flags.colored != NO ? "\x1b[0m" : "");
-            }
-        }
-        free(finfo.name);
-    }
-
-    if (!flags.more_info) printf("\n");
-}
-
-static int num_places (int n) {
-    int r = 1;
-    if (n < 0) n = (n == INT_MIN) ? INT_MAX: -n;
-    while (n > 9) {
-        n /= 10;
-        r++;
-    }
-    return r;
-}
-
-static void push_file(
-    struct FileInfo** files, 
-    struct FileListInfo* info, 
-    int* size, int* capacity, 
-    const char* file_path 
-) {
-    struct FileInfo finfo;
-    int user_len, group_len, name_len, size_len, link_len;
-
-    if (!get_file_info(file_path, &finfo)) return;
-
-    if (*size == *capacity) {
-        *capacity *= 2;
-        *files = realloc(*files, sizeof(struct FileInfo) * *capacity);
-    }
-    
-    user_len = strlen(finfo.usr->pw_name);
-    if (user_len > info->max_usr) info->max_usr = user_len;
-
-    group_len = strlen(finfo.grp->gr_name);
-    if (group_len > info->max_grp) info->max_grp = group_len;
-
-    name_len = strlen(file_path);
-    if (name_len > info->max_name) info->max_name = name_len;
-
-    size_len = strlen(finfo.size);
-    if (size_len > info->max_size) info->max_size = size_len;
-
-    link_len = num_places(finfo.links);
-    if (link_len > info->max_link) info->max_link = link_len;
-
-    info->total_len += name_len + 2;
-    info->total_size += finfo.bytes;
-
-    (*files)[*size] = finfo;
-    (*size)++;
-}
-
-static void recurse_directory(char* dir_name) {
-    DIR* d;
-    int capacity, size, save;
-    struct dirent* file;
-    struct FileInfo* files;
-    struct FileListInfo info;
-
-    save = push_path_buffer(dir_name);
-
-    d = get_directory(get_path_buffer());
-    if (d == NULL) {
-        return;
-    }
-
-    capacity = 8;
-    size = 0;
-    
-    files = malloc(sizeof(struct FileInfo) * capacity);
-    memset(&info, 0, sizeof(struct FileListInfo));
-
-    while((file = readdir(d)) != NULL) {
-        if (!flags.hidden && prefix(".", file->d_name)) continue;
-        if (flags.hide_dot && is_dot_dir(file->d_name)) continue;
-        if (file->d_type == DT_DIR && !is_dot_dir(file->d_name)) {
-            recurse_directory(file->d_name);
-        } else {
-            push_file(&files, &info, &size, &capacity, file->d_name);
-        }
-    }
-
-
-    if (flags.colored == NO) {
-        printf("\n%s:\n", get_path_buffer());
-    } else {
-        printf("\n%s%s:%s\n", DIR_COLOR, get_path_buffer(), FILE_COLOR);
-    }
-
-    list_files(files, size, info);
-
-    free(files);
-
-    if (!flags.more_info) printf("\n");
-
-    closedir(d);
-
-    pop_path_buffer(save);
-}
-
-static void list_directory(char* path) {
-
-    DIR* d;
-    int capacity, size, save;
-    struct FileInfo* files;
-    struct FileListInfo info;
-    struct dirent* file;
-
-    if (flags.recurse) {
-        recurse_directory(path);
-        return;
-    }
-
-    d = get_directory(path);
-    if (d == NULL) return;
-
-    save = push_path_buffer(path);
-
-    capacity = 8;
-    size = 0;
-    
-    files = malloc(sizeof(struct FileInfo) * capacity);
-    memset(&info, 0, sizeof(struct FileListInfo));
-    
-    while ((file = readdir(d)) != NULL) {
-        if (!flags.hidden && prefix(".", file->d_name)) continue;
-        if (flags.hide_dot && is_dot_dir(file->d_name)) continue;
-        push_file(&files, &info, &size, &capacity, file->d_name);
-    }
-
-    if (size > 0) list_files(files, size, info);
-    free(files);
-
-    pop_path_buffer(save);
-
-    closedir(d);
-}
-
-static bool is_dir(const char* path) {
-    struct stat s;
-    if (stat(path, &s) < 0) return false;
-    return S_ISDIR(s.st_mode);
-}
-
-static void list_file_args(int start, int argc, char** argv) {
-
-    int capacity, size, i;
-    struct FileInfo* files;
-    struct FileListInfo info;
-
-    capacity = 8;
-    size = 0;
-    
-    files = malloc(sizeof(struct FileInfo) * capacity);
-    memset(&info, 0, sizeof(struct FileListInfo));
-    
-    for (i = start; i < argc; i++) {
-        if (is_dir(argv[i])) continue;
-        push_file(&files, &info, &size, &capacity, argv[i]);
-    }
-    
-    if (size > 0) list_files(files, size, info);
-
-    free(files);
-}
-
-static void help(void) {
-    printf("Usage: ls [FILE]...\n\n");
-    printf("List directory contents\n\n");
-    printf("\t-1\tOne column output\n");
-    printf("\t-l\tLong format\n");
-    printf("\t-a\tInclude names starting with .\n");
-    printf("\t-A\tLike -a but without . and ..\n");
-    printf("\t-R\tRecurse\n");
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'R':
-            flags.recurse = true;
-            break;
-        case '1':
-            flags.one_column = true;
-            break;
-        case 'A':
-            flags.hide_dot = true;
-            flags.hidden = true;
-            break;
-        case 'a':
-            flags.hidden = true;
-            break;
-        case 'l':
-            flags.more_info = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-static int long_arg(char* cur, char* next) {
-    UNUSED(next);
-    if (prefix("--color=", cur)) {
-        char* arg = cur + 8;
-        if (streql("yes", arg) || streql("always", arg)) {
-            flags.colored = YES;
-        } else if (streql("auto", arg)) {
-            flags.colored = AUTO;
-        } else if (streql("no", arg) || streql("never", arg)) {
-            flags.colored = NO;
-        } else {
-            error("invalid color options: %s", arg);
-        }
-    } else {
-        return ARG_IGNORE;
-    }
-    return ARG_UNUSED;
-}
-
-COMMAND(ls) {
-
-    int start, i;
-    bool titled;
-
-    flags.hidden = false;
-    flags.more_info = false;
-    flags.hide_dot = false;
-    flags.one_column = false;
-    flags.recurse = false;
-    flags.colored = NO;
-
-    start = parse_args(argc, argv, help, short_arg, long_arg);
-
-    if (argc - start == 0) {
-        list_directory(".");
-        return EXIT_SUCCESS;
-    }
-
-    list_file_args(start, argc, argv); 
-
-    titled = argc - start > 1;
-    for (i = start; i < argc; i++) {
-
-        if (!is_dir(argv[i])) continue;
-        
-        if (titled && !flags.recurse) {
-            if (flags.colored != NO) {
-                printf("\n%s%s:%s\n", DIR_COLOR, argv[i], FILE_COLOR);
-            } else {
-                printf("\n%s:\n", argv[i]);
-            }
-        }
-
-        list_directory(argv[i]);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/mkdir.c b/src/commands/mkdir.c
deleted file mode 100644
index 02fccca..0000000
--- a/src/commands/mkdir.c
+++ /dev/null
@@ -1,65 +0,0 @@
-#include "../command.h"
-
-static struct {
-    bool make_parent;
-    mode_t mode;
-} flags;
-
-static int short_arg(char c, char* next) {
-    switch (c) {
-        case 'p':
-            flags.make_parent = true;
-            break;
-        case 'm':
-            check_arg(next);
-            flags.mode = get_mode(next);
-            return ARG_USED;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-static void help(void) {
-    printf("Usage: mkdir [-m MODE] [-p] DIRECTORY...\n\n");
-    printf("Create DIRECTORY\n\n");
-    printf("\t-m\tMODE\n");
-    printf("\t-p\tNo error if exists; make parent directories as needed\n");
-}
-
-static bool mkdir_parents(char* path) {
-    size_t i;
-    for (i = 1; i < strlen(path); i++) {
-        if (path[i] != '/') continue;
-        path[i] = '\0';
-        if (mkdir(path, flags.mode) < 0 && errno != EEXIST) {
-            error_s("failed to create directory '%s': %s", path, strerror(errno));
-            return false;
-        };
-        path[i] = '/';
-    }
-    return true;
-}
-
-COMMAND(makedir) {
-
-    int start, i;
-
-    if (argc < 1) global_help(help);
-
-    flags.make_parent = false;
-    flags.mode = 0755;
-    
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    for (i = start; i < argc; i++) {
-        if (flags.make_parent && !mkdir_parents(argv[i])) {
-            continue;
-        }
-        if (mkdir(argv[i], flags.mode) < 0) {
-            error_s("failed to create directory '%s': %s", argv[i], strerror(errno));
-        }
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/mv.c b/src/commands/mv.c
deleted file mode 100644
index d203607..0000000
--- a/src/commands/mv.c
+++ /dev/null
@@ -1,116 +0,0 @@
-#include "../command.h"
-
-static struct {
-    bool prompt;
-    bool dont_overwrite;
-    bool refuse_if_dir;
-    bool verbose;
-} flags;
-
-static void help(void) {
-    printf("Usage: mv [-inT] SOURCE... DIRECTORY\n\n");
-    printf("Rename SOURCE to DEST, or move SOURCEs to DIRECTORY\n");
-    printf("\t-i\tInteractive, prompt before overwriting\n");
-    printf("\t-n\tDon't overwrite an existing file\n");
-    printf("\t-T\tRefuse to move if DEST is a directory\n");
-    printf("\t-v\tVerbose\n");
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 't':
-            flags.prompt = true;
-            break;
-        case 'n':
-            flags.dont_overwrite = true;
-            break;
-        case 'T':
-            flags.refuse_if_dir = true;
-            break;
-        case 'v':
-            flags.verbose = true;
-            break;
-        default:
-            return ARG_UNUSED;
-    }
-    return ARG_USED;
-}
-
-static void mv_dir(bool exists) {
-
-    char c;
-
-    if (exists && flags.dont_overwrite) {
-        if (flags.verbose) output("skipping '%s'; overwrise is false", get_path_buffer_2());
-        return;
-    }
-    
-    if (exists && flags.prompt) {
-        fprintf(stderr, "overwrite '%s'? ", get_path_buffer_2());
-        fflush(stderr);
-        
-        c = getchar();
-        if (c != 'y' && c != 'Y') {
-            if (flags.verbose) output("skipping...");
-            return;
-        }
-
-    }
-    
-    if (rename(get_path_buffer(), get_path_buffer_2()) < 0) {
-        error_s("cannot move '%s': %s", get_path_buffer(), strerror(errno));
-    } else if (flags.verbose) {
-        output("moved '%s'", get_path_buffer());
-    }
-}
-
-COMMAND(mv) {
-
-    int start, dest, i;
-    struct stat s;
-
-    flags.refuse_if_dir = false;
-    flags.dont_overwrite = false;
-    flags.prompt = false;
-    flags.verbose = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (argc - start < 2) {
-        global_help(help);
-    }
-
-    push_path_buffer_2(argv[argc-1]);
-
-    dest = true;
-    if (lstat(get_path_buffer_2(), &s) < 0 && argc - start > 2) {
-        dest = false;
-        error("cannot stat '%s': %s", get_path_buffer_2(), strerror(errno));
-    }
-    
-    if (dest && flags.refuse_if_dir) {
-        if (S_ISDIR(s.st_mode)) {
-            error("target '%s': Is A Directory", get_path_buffer_2());
-        }
-    }
-
-    if (argc - start == 2) {
-        push_path_buffer(argv[argc-2]);
-        mv_dir(dest);
-        return EXIT_SUCCESS;
-    }
-
-    if (dest && !S_ISDIR(s.st_mode)) {
-        error("target '%s': Is Not A Directory", get_path_buffer_2());
-    }
-
-    for (i = start; i < argc - 1; i++) {
-        int save = push_path_buffer(argv[i]);
-        bool exists = lstat(get_path_buffer(), &s) >= 0;
-        mv_dir(exists);
-        pop_path_buffer(save);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/printf.c b/src/commands/printf.c
deleted file mode 100644
index 519b8a2..0000000
--- a/src/commands/printf.c
+++ /dev/null
@@ -1,141 +0,0 @@
-#include "../command.h"
-
-static long cast_long(const char* arg) {
-    char* end;
-    long l = strtol(arg, &end, 10);
-    if (end == arg) {
-        return 0;
-    } else {
-        return l;
-    }
-}
-
-static double cast_double(const char* arg) {
-    char* end;
-    double d = strtod(arg, &end);
-    if (end == arg) {
-        return 0.0;
-    } else {
-        return d;
-    }
-}
-
-#define NUMBER(name, type, arg) \
-    long l = cast_long(arg); \
-    type* t = (type*) &l; \
-    type name = *t;
-
-static void handle_percent(char n, const char* arg) {
-    switch (n) {
-        case 'd':
-        case 'z': {
-            NUMBER(i, int, arg)
-            printf("%d", i);
-            break;
-        }
-        case 'u': {
-            NUMBER(u, unsigned int, arg);
-            printf("%u", u);
-            break;
-        }
-        case 'f': {
-            double d = cast_double(arg);
-            printf("%f", d);
-            break;
-        }
-        case 'c': {
-            putchar(arg[0]);
-            break;
-        }
-        case 's': {
-            printf("%s", arg);
-            break;
-        }
-        default: {
-            putchar('%');
-            putchar(n);
-        }
-    }
-}
-
-static void handle_slash(char n) {
-    switch (n) {
-        case 'n':
-            putchar('\n');
-            break;
-        case 't':
-            putchar('\t');
-            break;
-        case 'v':
-            putchar('\v');
-            break;
-        case 'b':
-            putchar('\b');
-            break;
-        case 'f':
-            putchar('\f');
-            break;
-        case 'a':
-            putchar('\a');
-            break;
-        case '"':
-            putchar('"');
-            break;
-        case 'c':
-            exit(EXIT_SUCCESS);
-        default:
-            putchar('\\');
-            putchar(n);
-    }
-}
-
-static void help(void) {
-    printf("Usage printf FORMAT [ARG]...\n\n");
-    printf("Format and print ARG(s) according to FORMAT (a-la C prinf)\n");
-}
-
-COMMAND(print) {
-
-    size_t index;
-    int arg_index;
-    char n, *arg;
-
-    if (argc < 1) {
-        global_help(help);
-        return EXIT_SUCCESS;
-    }
-
-    parse_help(argc, argv, help);
-
-    index = 0;
-    arg_index = 0;
-
-    while (true) {
-        char c = argv[0][index];
-        index++;
-
-        if (c == '\0') break;
-        if (c != '%' && c != '\\') {
-            putchar(c);
-            continue;
-        }
-
-        n = argv[0][index];
-        index++;
-
-        arg = NULL;
-        if (arg_index < argc) {
-            arg = argv[arg_index + 1];
-        }
-
-        if (c == '%') {
-            handle_percent(n, arg);
-        } else {
-            handle_slash(n);
-        }
-
-        arg_index++;
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/rm.c b/src/commands/rm.c
deleted file mode 100644
index 8ce3e1c..0000000
--- a/src/commands/rm.c
+++ /dev/null
@@ -1,136 +0,0 @@
-#include "../command.h"
-#include <dirent.h>
-#include <string.h>
-
-static struct {
-    bool force;
-    bool prompt;
-    bool verbose;
-    bool recurse;
-} flags;
-
-static void help(void) {
-    printf("Usage: rm [-irfv] FILE...\n\n");
-    printf("Remove (unlink) FILESs\n\n");
-    printf("\t-i\tAlways prompt before removing\n");
-    printf("\t-f\tForce, never prompt\n");
-    printf("\t-v\tVerbose\n");
-    printf("\t-R,-r\tRecurse\n");
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'i':
-            flags.prompt = true;
-            break;
-        case 'f':
-            flags.force = true;
-            break;
-        case 'v':
-            flags.verbose = true;
-            break;
-        case 'R':
-        case 'r':
-            flags.recurse = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-static void rm_file (char* path);
-
-static bool rm_dir (void) {
-    DIR* d;
-    struct dirent* file;
-    
-    d = opendir(get_path_buffer());
-    if (d == NULL) {
-        error_s("failed to stat '%s': %s\n", get_path_buffer(), strerror(errno));
-        return false;
-    }
-
-    while ((file = readdir(d)) != NULL) {
-        if (is_dot_dir(file->d_name)) continue;
-        rm_file(file->d_name);
-    }
-
-    closedir(d);
-    return true;
-}
-
-static void rm_file(char* path) {
-    int save = push_path_buffer(path);
-
-    struct stat s;
-    if (lstat(get_path_buffer(), &s) < 0) {
-        pop_path_buffer(save);
-        error_s("failed to stat '%s': %s\n", get_path_buffer(), strerror(errno));
-        return;
-    }
-
-    if (S_ISDIR(s.st_mode)) {
-        if (!flags.force) {
-            error_s("cannot delete '%s': Is a directory\n", get_path_buffer());
-            pop_path_buffer(save);
-            return;
-        }
-        if (flags.recurse && !rm_dir()) {
-            pop_path_buffer(save);
-            return;
-        }
-    }
-
-    if (flags.prompt) {
-        char c;
-
-        fprintf(stderr, "delete '%s'? ", get_path_buffer());
-        fflush(stderr);
-        
-        c = getchar();
-        if (c != 'y' && c != 'Y') {
-            fprintf(stderr, "Skipping...\n");
-            pop_path_buffer(save);
-            return;
-        }
-    }
-
-    if (remove(get_path_buffer()) < 0) {
-        error_s("failed to delete '%s': %s\n", get_path_buffer(), strerror(errno));
-    } else if (flags.verbose) {
-        output("deleted '%s'\n", get_path_buffer());
-    }
-
-    pop_path_buffer(save);
-}
-
-COMMAND(rm) {
-
-    int start, i;
-
-    if (argc < 1) {
-        global_help(help);
-        return EXIT_SUCCESS;
-    }
-
-    flags.prompt = false;
-    flags.force = false;
-    flags.verbose = false;
-    flags.recurse = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-#ifdef FRENCH
-    if (streql(argv[0], "-fr")) {
-        printf("\x1b[94mremoving \x1b[97mthe \x1b[91mfrench \x1b[93m(baguette noises)\x1b[0m\n");
-    }
-#endif
-
-    for (i = start; i < argc; i++) {
-        rm_file(argv[i]);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/tac.c b/src/commands/tac.c
deleted file mode 100644
index d188de9..0000000
--- a/src/commands/tac.c
+++ /dev/null
@@ -1,117 +0,0 @@
-#include "../command.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <limits.h>
-
-static void help(void) {
-    printf("Usage: tac [FILE]...\n\n");
-    printf("Concatenate FILEs and print them in reverse\n");
-}
-
-static void print_range(FILE* file, int start, int end) {
-    int len, i;
-
-    len = end - start;
-    fseek(file, start, SEEK_SET);
-    
-    for (i = 0; i < len; i++) {
-        putchar(getc(file));
-    }
-    
-    fflush(stdout);
-}
-
-static char stdin_path[PATH_MAX];
-
-static FILE* read_stdin (void) {
-    static bool read;
-    static FILE* file;
-    int r;
-    char c;
-
-    if (read) goto finished;
-    read = true;
-    
-    srand(time(NULL));
-    
-    r = rand() % 1000000;
-    
-    sprintf(stdin_path, "/tmp/%d.tac", r);
-    file = get_file(stdin_path, "w");
-
-    while((c = getchar()) != EOF) putc(c, file);
-    fclose(file);
-
-    file = get_file(stdin_path, "r");
-
-finished:
-    return file;
-}
-
-static void parse_file(FILE* file, struct Stack* stack) {
-    char buf[1024], c;
-    int read, i;
-    int total = 1;
-
-    stack_push_int(stack, 0);
-    rewind(file);
-    while ((read = fread(buf, 1, 1024, file)) > 0) {
-        for (i = 0; i < read; i++) {
-            c = buf[i];
-            if (c != '\n') continue;
-            stack_push_int(stack, total + i);
-        }
-        total += read;
-    }
-}
-
-static void tac_file(FILE* file) {
-    struct Stack stack;
-    int last, current;
-    
-    stack_init(&stack, 80);
-    parse_file(file, &stack);
-    rewind(file);
-
-    if (!stack_pop_int(&stack, &last)) goto cleanup;
-    
-    while(stack_pop_int(&stack, &current)) {
-        print_range(file, current, last);
-        last = current;
-    }
-
-cleanup:
-
-    stack_free(&stack);
-}
-
-COMMAND(tac) {
-
-    FILE* in;
-    int i;
-
-    parse_help(argc, argv, help);
-
-    in = read_stdin();
-
-    if (argc < 1) {
-        tac_file(in);
-        return EXIT_SUCCESS;
-    }
-
-    for (i = 0; i < argc; i++) {
-        FILE* file = get_file(argv[i], "r");
-        if (file == stdin) {
-            tac_file(in);
-        } else {
-            tac_file(file);
-            fclose(file);
-        }
-    }
-
-    fclose(in);
-    remove(stdin_path);
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/tail.c b/src/commands/tail.c
deleted file mode 100644
index 07b3d2b..0000000
--- a/src/commands/tail.c
+++ /dev/null
@@ -1,238 +0,0 @@
-#include "../command.h"
-
-static struct {
-    bool lines;
-    int count;
-    bool print_headers;
-    bool dont_print_headers;
-    bool print_as_grow;
-    int grow_wait;
-} flags;
-
-static size_t tail_file_lines(FILE* file, unsigned int count, size_t skip) {
-
-    char** ring;
-    int* ring_len;
-    int index, read;
-    unsigned int size, i;
-    size_t len;
-    char* line;
-
-    ring = malloc(sizeof(char*) * count);
-    memset(ring, 0, sizeof(char*) * count);
-
-    ring_len = malloc(sizeof(int) * count);
-    
-    index = 0;
-    size = 0;
-
-    fseek(file, skip, SEEK_SET);
-    
-    len = skip;
-    line = NULL;
-    
-    while ((read = getline(&line, &len, file)) != -1) {
-
-        if (ring[index] != NULL) free(ring[index]);
-        ring[index] = line;
-        ring_len[index] = read;
-
-        index++;
-        index %= count;
-        if (size < count) size++;
-
-        line = NULL;
-    }
-
-    index += count - size;
-    index %= count;
-   
-    for (i = 0; i < size; i++) {
-        fwrite(ring[index], ring_len[index], 1, stdout);
-        free(ring[index]);
-        index += 1;
-        index %= count;
-    }
-
-    free(line);
-    fclose(file);
-    free(ring);
-    free(ring_len);
-
-    return len;
-}
-
-static size_t tail_file_chars(FILE* file, unsigned int count, size_t skip) {
-
-    char* ring;
-    int index;
-    unsigned int size, i;
-    int read, c;
-
-    ring = malloc(sizeof(char) * count);
-    memset(ring, 0, count);
-
-    index = 0;
-    size = 0;
-
-    fseek(file, skip, SEEK_SET);
-    read = skip;
-    
-    while((c = getc(file)) != EOF) {
-        ring[index] = c;
-        index++;
-        read++;
-        index %= count;
-        if (size < count) size++;
-    }
-
-    index += count - size;
-    index %= count;
-
-    for (i = 0; i < size; i++) {
-        putchar(ring[index]);
-        index += 1;
-        index %= count;
-    }
-
-    fclose(file);
-
-    return read;
-}
-
-static void help(void) {
-    printf("Usage: tail [OPTIONS] [FILE]...\n\n");
-    printf("Print last 10 lines of FILEs (or stdin) to.\n");
-    printf("With more than one FILE, precede each with a filename header.\n\n");
-    printf("\t-c [+]N[bkm]\tPrint last N bytes\n");
-	printf("\t-n N[bkm]\tPrint last N lines\n");
-	printf("\t\t\t(b:*512 k:*1024 m:*1024^2)\n");
-	printf("\t-q\t\tNever print headers\n");
-	printf("\t-v\t\tAlways print headers\n");
-	printf("\t-f\t\tPrint data as file grows\n");
-	printf("\t-s SECONDS\tWait SECONDS between reads with -f\n");
-    exit(EXIT_SUCCESS);
-}
-
-static void print_header(char* path, bool many) {
-    if (flags.dont_print_headers) return;
-    if (!many && !flags.print_headers) return;
-    if (streql("-", path)) {
-        printf("\n==> standard input <==\n");
-    } else {
-        printf("\n=>> %s <==\n", path);
-    }
-}
-
-static void tail_file(char* path, bool many) {
-
-    FILE* file;
-    size_t skip;
-
-    file = get_file(path, "r");
-    print_header(path, many);
-    
-    skip = 0;
-    while (true) {
-        if (flags.lines) {
-            skip = tail_file_lines(file, flags.count, skip);
-        } else {
-            skip = tail_file_chars(file, flags.count, skip);
-        }
-        if (!flags.print_as_grow) break;
-        sleep(flags.grow_wait);
-        get_file(path, "r");
-    };
-}
-
-static int short_arg(char c, char* next) {
-    switch (c) {
-        case 'c': {
-            long int bkm;
-
-            flags.lines = false;
-            
-            check_arg(next);
-            bkm = get_blkm(next);
-            
-            if (bkm < 1) {
-                error("bkm cannot be less than 1");
-            }
-            
-            flags.count = bkm;
-            return ARG_USED;
-        }
-        case 'n': {
-            long int bkm;
-
-            flags.lines = true;
-            
-            check_arg(next);
-            bkm = get_blkm(next);
-            
-            if (bkm < 1) {
-                error("bkm cannot be less than 1");
-            }
-            
-            flags.count = bkm;
-            return ARG_USED;
-        }
-        case 'q':
-            flags.dont_print_headers = true;
-            break;
-        case 'v':
-            flags.print_headers = true;
-            break;
-        case 'f':
-            flags.print_as_grow = true;
-            break;
-        case 's': {
-            long int sec;
-
-            check_arg(next);
-            sec = get_number(next);
-            
-            if (sec < 1) {
-                error("wait seconds cannot be less than 1");
-            }
-            
-            flags.grow_wait = sec;
-            return ARG_USED;
-        }
-        default: 
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-COMMAND(tail) {
-
-    int start, count, i;
-
-    flags.count = 10;
-    flags.dont_print_headers = false;
-    flags.print_headers = false;
-    flags.lines = true;
-    flags.print_as_grow = false;
-    flags.grow_wait = 10;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    count = argc - start;
-
-    if (count < 1) {
-        tail_file_lines(stdin, 10, 0);
-        return EXIT_SUCCESS;
-    }
-
-    if (count == 1) {
-        tail_file(argv[start], false);
-        return EXIT_SUCCESS;
-    }
-
-    for (i = 0; i < count; i++) {
-        tail_file(argv[start + i], true);
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/tee.c b/src/commands/tee.c
deleted file mode 100644
index b9b31be..0000000
--- a/src/commands/tee.c
+++ /dev/null
@@ -1,81 +0,0 @@
-#include "../command.h"
-
-#include <signal.h>
-
-static struct {
-    bool append;
-    bool handle_sigint;
-} flags;
-
-static void help(void) {
-    printf("Usage: tee [-ai] [FILE]...\n\n");
-    printf("Copy stdin to each FILE, and also to stdout\n\n");
-	printf("\t-a	Append to the given FILEs, don't overwrite\n");
-	printf("\t-i	Ignore interrupt signals (SIGINT)\n");
-    exit(EXIT_SUCCESS);
-}
-
-static void handle(int dummy){UNUSED(dummy);}
-
-static void run_tee(int file_count, FILE** files) {
-    char c;
-    int i;
-
-    while((c = getchar()) != EOF) {
-        int i;
-        for (i = 0; i < file_count; i++) {
-            fwrite(&c, 1, 1, files[i]);
-            fflush(files[i]);
-        }
-        putchar(c);
-    }
-
-    for (i = 0; i < file_count; i++) {
-        fclose(files[i]);
-    }
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'a':
-            flags.append = true;
-            break;
-        case 'i':
-            flags.handle_sigint = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-COMMAND(tee) {
-
-    int start, i;
-    FILE** files;
-
-    flags.append = false;
-    flags.handle_sigint = false;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (flags.handle_sigint) {
-        signal(SIGINT, handle);
-    }
-
-    if (argc - start < 1) {
-        run_tee(0, NULL);
-        return EXIT_SUCCESS;
-    }
-
-    files = malloc(sizeof(FILE*) * (argc - start));
-
-    for (i = start; i < argc; i++) {
-        FILE* file = get_file(argv[i], flags.append ? "a" : "w");
-        files[i - start] = file;
-    }
-
-    run_tee(argc - start, files);
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/wc.c b/src/commands/wc.c
deleted file mode 100644
index d8905a5..0000000
--- a/src/commands/wc.c
+++ /dev/null
@@ -1,159 +0,0 @@
-#include "../command.h"
-
-#include <ctype.h>
-
-static struct {
-    bool newlines;
-    bool words;
-    bool characters;
-    bool bytes;
-    bool longest_line;
-    bool has_flags;
-} flags;
-
-static int lines = 0;
-static int words = 0;
-static int chars = 0;
-static int bytes = 0;
-static int logst = 0;
-
-static void list(int l, int w, int c, int b, int lg) {
-    if (flags.newlines) {
-        printf("\t%d", l);
-    }
-    if (flags.words) {
-        printf("\t%d", w);
-    }
-    if (flags.characters) {
-        printf("\t%d", c);
-    }
-    if (flags.bytes) {
-        printf("\t%d", b);
-    }
-    if (flags.longest_line) {
-        printf("\t%d", lg);
-    }
-}
-
-#define BS 1024
-
-static bool is_delimiter(char c) {
-    return c == ' ' || c == '\t' || c == '\n';
-}
-
-static void run_wc(FILE* file) {
-    int l = 0, w = 0, c = 0, b = 0, lg = 0;
-
-    bool in_word = false;
-    int current_length = 0;
-
-    int read;
-    char buf[BS];
-    while ((read = fread(buf, 1, 1024, file)) > 0) {
-        int i;
-        for (i = 0; i < read; i++) {
-            char ch = buf[i];
-            b++;
-            if (ch == '\n') { 
-                l++;
-                lg = lg > current_length ? lg : current_length;
-                current_length = 0;
-            } else {
-                current_length++;
-            }
-            if (isprint(ch) || is_delimiter(ch)) c++;
-            if (in_word && is_delimiter(ch)) {
-                in_word = false;
-                w++;
-            } else if (!in_word && !is_delimiter(ch) && isprint(ch)) {
-                in_word = true;
-            }
-        }
-    }
-    if (in_word) w++;
-    lg = lg > current_length ? lg : current_length;
-    list(l, w, c, b, lg);
-    lines += l;
-    words += w;
-    chars += c;
-    bytes += b;
-    logst += lg;
-    if (file != stdin)
-        fclose(file);
-}
-
-static void help(void) {
-    printf("Usage: wc [-cmlwL] [FILE]...\n\n");
-    printf("Count lines, words, and bytes for FILEs (or stdin)\n\n");
-	printf("\t-c	Count bytes\n");
-	printf("\t-m	Count characters\n");
-	printf("\t-l	Count newlines\n");
-	printf("\t-w	Count words\n");
-	printf("\t-L	Print longest line length\n");
-    exit(EXIT_SUCCESS);
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-    switch (c) {
-        case 'c':
-            flags.bytes = true;
-            break;
-        case 'm':
-            flags.characters = true;
-            break;
-        case 'l':
-            flags.newlines = true;
-            break;
-        case 'w':
-            flags.words = true;
-            break;
-        case 'L':
-            flags.longest_line = true;
-            break;
-        default:
-            return ARG_INVALID;
-    }
-    flags.has_flags = true;
-    return ARG_UNUSED;
-}
-
-COMMAND(wc) {
-
-    int start, i;
-
-    flags.newlines = false;
-    flags.words = false;
-    flags.characters = false;
-    flags.bytes = false;
-    flags.longest_line = false;
-    flags.has_flags = false;
-
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (!flags.has_flags) {
-        flags.newlines = true;
-        flags.words = true;
-        flags.characters = true;
-    }
-
-    if (argc - start < 1) {
-        run_wc(stdin);
-        printf("\n");
-        return EXIT_SUCCESS;
-    }
-
-    for (i = start; i < argc; i++) {
-        FILE* file = get_file(argv[i], "r");
-        run_wc(file);
-        printf("\t%s\n", argv[i]);
-    }
-
-    if (argc - start > 1) {
-        list(lines, words, chars, bytes, logst);
-        printf("\ttotal\n");
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/whoami.c b/src/commands/whoami.c
deleted file mode 100644
index 7fd7c85..0000000
--- a/src/commands/whoami.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include "../command.h"
-
-#include <pwd.h>
-
-static void help(void) {
-    printf("Usage: whoami\n\n");
-    printf("Print the username associated with the current effective user id\n");
-    exit(EXIT_SUCCESS);
-}
-
-COMMAND(whoami) {
-
-    uid_t usr;
-    struct passwd* passwd;
-
-    parse_help(argc, argv, help);
-
-    usr = getuid();
-    passwd = getpwuid(usr);
-    
-    if (passwd == NULL) {
-        printf("\x1b[1;91myou do not exist.\n");
-    } else {
-        printf("%s\n", passwd->pw_name);
-    }
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/xargs.c b/src/commands/xargs.c
deleted file mode 100644
index 3008c3c..0000000
--- a/src/commands/xargs.c
+++ /dev/null
@@ -1,187 +0,0 @@
-#include "../command.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-static struct {
-    bool null_seperated;
-    bool ignore_empty;
-    bool print_command;
-    bool prompt_command;
-    int max_args;
-    FILE* file;
-} flags;
-
-static void help(void) {
-    printf("Usage: xargs [OPTIONS] [PROG ARGS]\n\n");
-    printf("Run PROG on every item given by stdin\n\n");
-	printf("\t-0\tInput is separated by NULs\n");
-	printf("\t-a FILE\tRead from FILE instead of stdin\n");
-	printf("\t-r\tDon't run command if input is empty\n");
-	printf("\t-t\tPrint the command on stderr before execution\n");
-	printf("\t-p\tAsk user whether to run each command\n");
-	printf("\t-n N\tPass no more than N args to PROG\n");
-}
-
-static int short_arg(char c, char* next) {
-    UNUSED(next);
-
-    switch (c) {
-        case '0':
-            flags.null_seperated = true;
-            break;
-        case 'a':
-            check_arg(next);
-            flags.file = get_file(next, "r");
-            return ARG_USED;
-        case 'r':
-            flags.ignore_empty = true;
-            break;
-        case 't':
-            flags.print_command = true;
-            break;
-        case 'p':
-            flags.prompt_command = true;
-            break;
-        case 'n': {
-            long int n;
-
-            check_arg(next);
-            n = get_number(next);
-            
-            if (n < 1) {
-                error("max arg count must be at least 1");
-            }
-            
-            flags.max_args = n;
-            return ARG_USED;
-        }
-        default:
-            return ARG_INVALID;
-    }
-    return ARG_UNUSED;
-}
-
-char* read_next(FILE* file, int arg_count) {
-
-    int size, capacity;
-    char* buf;
-    char c;
-
-    if (flags.max_args != -1 && arg_count == flags.max_args) return NULL;
-
-    size = 0;
-    capacity = 8;
-    buf = malloc(sizeof(char) * capacity);
-
-    while(c = getc(file), true) {
-        if (c == EOF && size == 0) {
-            free(buf);
-            return NULL;
-        }
-
-        if (size == capacity) {
-            capacity *= 2;
-            buf = realloc(buf, sizeof(char) * capacity);
-        }
-
-        if (c == '\0' || c == EOF || (!flags.null_seperated && c == '\n')) {
-            buf[size++] = '\0';
-            return buf;
-        } else {
-            buf[size++] = c;
-        }
-    }
-}
-
-void read_args(FILE* file, char*** args, int* size, int* capacity) {
-    char* arg;
-    static int read = 0;
-    while (arg = read_next(file, read), true) {
-        if (*size == *capacity) {
-            *capacity *= 2;
-            *args = realloc(*args, sizeof(char*) * *capacity);
-        }
-        (*args)[(*size)++] = arg;
-        read++;
-        if (arg == NULL) break;
-    }
-}
-
-COMMAND(xargs) {
-
-    int start, arg_start, arg_on_stack_count;
-    int size, capacity, i;
-    char* command;
-    char** args;
-
-    flags.null_seperated = false;
-    flags.ignore_empty = false;
-    flags.print_command = false;
-    flags.print_command = false;
-    flags.max_args = -1;
-    flags.file = stdin;
-
-    start = parse_args(argc, argv, help, short_arg, NULL);
-
-    if (start >= argc) {
-        command = "echo";
-    } else {
-        command = argv[start]; 
-    }
-
-    arg_start = start + 1;
-
-    if (arg_start >= argc) {
-        arg_on_stack_count = 0;
-        arg_start = argc - 1;
-    } else {
-        arg_on_stack_count = argc - arg_start;
-    }
-
-    size = arg_on_stack_count + 1;
-    capacity = size + 8;
-    
-    args = malloc(sizeof(char*) * capacity);
-    args[0] = command;
-    memcpy(&args[1], &argv[arg_start], arg_on_stack_count * sizeof(char*));
-    read_args(flags.file, &args, &size, &capacity);
-
-    if (flags.ignore_empty && size < 2) goto cleanup;
-
-    if (flags.prompt_command || flags.print_command) {
-        for (i = 0; i < size - 1; i++) {
-            fprintf(stderr, "%s ", args[i]);
-        }
-        fprintf(stderr, "\b\n");
-    }
-
-    if (flags.prompt_command) {
-        FILE* in;
-        char c;
-
-        fprintf(stderr, "Run command? ");
-        fflush(stderr);
-        
-        in = get_tty_stream("r");
-        c = getc(in);
-        fclose(in);
-        
-        if (c != 'y' && c != 'Y') {
-            fprintf(stderr, "Skipping...\n");
-            goto cleanup;
-        }
-    }
-
-    if (execvp(command, args) == -1) {
-        error("error: failed to execute command: %s", strerror(errno));
-    }
-
-cleanup:
-
-    for (i = arg_on_stack_count + 1; i < size - 1; i++) {
-        free(args[i]);
-    }
-    fclose(flags.file);
-
-    return EXIT_SUCCESS;
-}
diff --git a/src/commands/yes.c b/src/commands/yes.c
deleted file mode 100644
index 6a44789..0000000
--- a/src/commands/yes.c
+++ /dev/null
@@ -1,26 +0,0 @@
-#include "../command.h"
-
-static void help(void) {
-    printf("Usage: yes [STRING]\n\n");
-    printf("Repeatedly output a line with all specified STRING(s), or 'y'.\n");
-}
-
-COMMAND(yes) {
-    const char* repeat;
-    int i;
-
-    parse_help(argc, argv, help);
-
-    if (argc == 0) {
-        repeat = "y";
-    } else {
-        repeat = argv[0];
-        for (i = 1; i < argc; i++) {
-            *(argv[i]-1) = ' ';
-        }
-    }
-
-    while (true) {
-        printf("%s\n", repeat);
-    }
-}