add wiki support to cgitHEADmaster

1 files changed, 213 insertions, 0 deletions

diff --git a/ui-wiki.c b/ui-wiki.c
new file mode 100644
index 0000000..9fdb4b9
--- /dev/null
+++ b/ui-wiki.c
@@ -0,0 +1,213 @@
+/* ui-wiki.c: functions for wiki output
+ *
+ * Copyright (C) 2006-2017 cgit Development Team <cgit@lists.zx2c4.com>
+ * Copyright (C) 2025 Freya Murphy <freya@freyacat.org>
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+ #define USE_THE_REPOSITORY_VARIABLE
+
+#include "cgit.h"
+#include "ui-wiki.h"
+#include "html.h"
+#include "ui-shared.h"
+
+ #define WIKI_PATH ".wiki"
+
+struct walk_wiki_context {
+	char *curr_rev;
+	int state;
+	int index;
+};
+
+static void print_page(const struct object_id *oid, const char *path, const char *basename, const char *rev)
+{
+	enum object_type type;
+	unsigned long size;
+	char *buf;
+
+	type = oid_object_info(the_repository, oid, &size);
+	if (type == OBJ_BAD) {
+		cgit_print_error_page(404, "Not found",
+			"Bad object name: %s", oid_to_hex(oid));
+		return;
+	}
+
+	buf = repo_read_object_file(the_repository, oid, &type, &size);
+	if (!buf) {
+		cgit_print_error_page(500, "Internal server error",
+			"Error reading object %s", oid_to_hex(oid));
+		return;
+	}
+
+	html("<div id='summary'>");
+	cgit_open_filter(ctx.repo->about_filter, basename);
+	html_raw(buf, size);
+	cgit_close_filter(ctx.repo->about_filter);
+	html("</div>");
+
+	free(buf);
+}
+
+static int ls_wiki(const struct object_id *oid, const char *pathname, struct walk_wiki_context *walk_wiki_ctx)
+{
+	char *name, *link, *ptr;
+
+	if (isdigit(*pathname)) {
+		long index = strtol(pathname, &ptr, 10);
+		if (ptr && *ptr == '-') {
+			pathname = ptr + 1;
+			walk_wiki_ctx->index = index;
+		}
+	}
+
+	name = xstrdup(pathname);
+	ptr = strrchr(name, '.');
+	if (ptr)
+		*ptr = '\0';
+	link = xstrdup(name);
+	for (ptr = name; *ptr; ptr++) {
+		if (*ptr == '-')
+			*ptr = ' ';
+	}
+	for (ptr = link; *ptr; ptr++)
+		*ptr = tolower(*ptr);
+
+	html("<tr><td class='ls-index'>");
+	htmlf("%d", walk_wiki_ctx->index);
+	html("</td><td class>");
+	cgit_wiki_link(name, NULL, "ls-link", ctx.qry.head, walk_wiki_ctx->curr_rev, link);
+	html("</td></tr>\n");
+
+	walk_wiki_ctx->index++;
+	free(name);
+	free(link);
+	return 0;
+}
+
+static void ls_head(void)
+{
+	cgit_print_layout_start();
+	html("<table summary='wiki listing' class='list'>\n");
+	html("<tr class='nohover'>");
+	html("<th class='left'>Index</th>");
+	html("<th class='left'>Title</th>");
+	html("<th/>");
+	html("</tr>\n");
+}
+
+static void ls_tail(void)
+{
+	html("</table>\n");
+}
+
+static int walk_wiki(const struct object_id *oid, struct strbuf *base,
+		const char *pathname, unsigned mode, void *cbdata)
+{
+	struct walk_wiki_context *walk_wiki_ctx = cbdata;
+
+	if (!strcmp(pathname, WIKI_PATH))
+		return READ_TREE_RECURSIVE;
+
+	if (walk_wiki_ctx->state < 2) {
+		if (walk_wiki_ctx->state == 0) {
+			walk_wiki_ctx->state = 1;
+			ls_head();
+		}
+
+		ls_wiki(oid, pathname, walk_wiki_ctx);
+	} else if (walk_wiki_ctx->state == 2) {
+		const char *name;
+
+		name = pathname;
+		if (isdigit(*name)) {
+			char *ptr;
+			strtol(name, &ptr, 10);
+			if (ptr && *ptr == '-')
+				name = ptr + 1;
+		}
+
+		if (!strncasecmp(name, ctx.qry.path, strlen(ctx.qry.path))) {
+			struct strbuf buffer = STRBUF_INIT;
+
+			strbuf_addbuf(&buffer, base);
+			strbuf_addstr(&buffer, pathname);
+
+			walk_wiki_ctx->state = 3;
+			print_page(oid, pathname, buffer.buf, walk_wiki_ctx->curr_rev);
+			strbuf_release(&buffer);
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Show repo wiki
+ *   rev:  the commit pointing at the root ui object
+ *   path: partial name of a wiki md file
+ */
+void cgit_print_wiki(const char *rev)
+{
+	struct object_id oid;
+	struct commit *commit;
+	struct pathspec_item path_items = {
+		.match = WIKI_PATH,
+		.len = sizeof(WIKI_PATH) - 1,
+	};
+	struct pathspec paths = {
+		.nr = 1,
+		.items = &path_items
+	};
+	struct walk_wiki_context walk_wiki_ctx = {
+		.state = 0,
+		.index = 1
+	};
+
+	if (!rev)
+		rev = ctx.qry.head;
+
+	if (repo_get_oid(the_repository, rev, &oid)) {
+		cgit_print_error_page(404, "Not found",
+			"Invalid revision name: %s", rev);
+		return;
+	}
+	commit = lookup_commit_reference(the_repository, &oid);
+	if (!commit || repo_parse_commit(the_repository, commit)) {
+		cgit_print_error_page(404, "Not found",
+			"Invalid commit reference: %s", rev);
+		return;
+	}
+
+	walk_wiki_ctx.curr_rev = xstrdup(rev);
+
+	// print wiki pages
+	read_tree(the_repository, repo_get_commit_tree(the_repository, commit),
+		  &paths, walk_wiki, &walk_wiki_ctx);
+
+	if (walk_wiki_ctx.state == 0) {
+		cgit_print_error_page(404, "Not found", "Wiki not found");
+		goto cleanup;
+	}
+
+	ls_tail();
+
+	// print active wiki page
+	if (ctx.qry.path) {
+		html("<hr>\n");
+
+		walk_wiki_ctx.state = 2;
+		read_tree(the_repository, repo_get_commit_tree(the_repository, commit),
+			  &paths, walk_wiki, &walk_wiki_ctx);
+
+		if (walk_wiki_ctx.state == 2)
+			cgit_print_error("Wiki page not found");
+	}
+
+	cgit_print_layout_end();
+
+cleanup:
+	free(walk_wiki_ctx.curr_rev);
+}