1 files changed, 57 insertions, 0 deletions
diff --git a/packages/frontend/src/utility/mfm-function-picker.ts b/packages/frontend/src/utility/mfm-function-picker.ts
new file mode 100644
index 0000000000..a2f777f623
--- /dev/null
+++ b/packages/frontend/src/utility/mfm-function-picker.ts
@@ -0,0 +1,57 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { nextTick } from 'vue';
+import type { Ref } from 'vue';
+import * as os from '@/os.js';
+import { i18n } from '@/i18n.js';
+import { MFM_TAGS } from '@@/js/const.js';
+import type { MenuItem } from '@/types/menu.js';
+
+/**
+ * MFMの装飾のリストを表示する
+ */
+export function mfmFunctionPicker(src: HTMLElement | EventTarget | null, textArea: HTMLInputElement | HTMLTextAreaElement, textRef: Ref<string>) {
+	os.popupMenu([{
+		text: i18n.ts.addMfmFunction,
+		type: 'label',
+	}, ...getFunctionList(textArea, textRef)], src);
+}
+
+function getFunctionList(textArea: HTMLInputElement | HTMLTextAreaElement, textRef: Ref<string>): MenuItem[] {
+	return MFM_TAGS.map(tag => ({
+		text: tag,
+		icon: 'ti ti-icons',
+		action: () => add(textArea, textRef, tag),
+	}));
+}
+
+function add(textArea: HTMLInputElement | HTMLTextAreaElement, textRef: Ref<string>, type: string) {
+	const caretStart: number = textArea.selectionStart as number;
+	const caretEnd: number = textArea.selectionEnd as number;
+
+	MFM_TAGS.forEach(tag => {
+		if (type === tag) {
+			if (caretStart === caretEnd) {
+				// 単純にFunctionを追加
+				const trimmedText = `${textRef.value.substring(0, caretStart)}$[${type} ]${textRef.value.substring(caretEnd)}`;
+				textRef.value = trimmedText;
+			} else {
+				// 選択範囲を囲むようにFunctionを追加
+				const trimmedText = `${textRef.value.substring(0, caretStart)}$[${type} ${textRef.value.substring(caretStart, caretEnd)}]${textRef.value.substring(caretEnd)}`;
+				textRef.value = trimmedText;
+			}
+		}
+	});
+
+	const nextCaretStart: number = caretStart + 3 + type.length;
+	const nextCaretEnd: number = caretEnd + 3 + type.length;
+
+	// キャレットを戻す
+	nextTick(() => {
+		textArea.focus();
+		textArea.setSelectionRange(nextCaretStart, nextCaretEnd);
+	});
+}