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Add some handy markdown editor features (#32400)

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There were some missing features from EasyMDE:

1. H1 - H3 style
2. Auto add task list
3. Insert a table

And added some tests
This commit is contained in:
wxiaoguang
2024-11-04 18:14:36 +08:00
committed by GitHub
parent 54146e62c0
commit af28ce59b8
9 changed files with 138 additions and 22 deletions
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21
web_src/js/features/comp/EditorMarkdown.ts
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@@ -4,6 +4,16 @@ export function triggerEditorContentChanged(target) {
target.dispatchEvent(new CustomEvent(EventEditorContentChanged, {bubbles: true}));
}
export function textareaInsertText(textarea, value) {
const startPos = textarea.selectionStart;
const endPos = textarea.selectionEnd;
textarea.value = textarea.value.substring(0, startPos) + value + textarea.value.substring(endPos);
textarea.selectionStart = startPos;
textarea.selectionEnd = startPos + value.length;
textarea.focus();
triggerEditorContentChanged(textarea);
}
function handleIndentSelection(textarea, e) {
const selStart = textarea.selectionStart;
const selEnd = textarea.selectionEnd;
@@ -46,7 +56,7 @@ function handleIndentSelection(textarea, e) {
triggerEditorContentChanged(textarea);
}
function handleNewline(textarea, e) {
function handleNewline(textarea: HTMLTextAreaElement, e: Event) {
const selStart = textarea.selectionStart;
const selEnd = textarea.selectionEnd;
if (selEnd !== selStart) return; // do not process when there is a selection
@@ -66,9 +76,9 @@ function handleNewline(textarea, e) {
const indention = /^\s*/.exec(line)[0];
line = line.slice(indention.length);
// parse the prefixes: "1. ", "- ", "* ", "[ ] ", "[x] "
// parse the prefixes: "1. ", "- ", "* ", there could also be " [ ] " or " [x] " for task lists
// there must be a space after the prefix because none of "1.foo" / "-foo" is a list item
const prefixMatch = /^([0-9]+\.|[-*]|\[ \]|\[x\])\s/.exec(line);
const prefixMatch = /^([0-9]+\.|[-*])(\s\[([ x])\])?\s/.exec(line);
let prefix = '';
if (prefixMatch) {
prefix = prefixMatch[0];
@@ -85,8 +95,9 @@ function handleNewline(textarea, e) {
} else {
// start a new line with the same indention and prefix
let newPrefix = prefix;
if (newPrefix === '[x]') newPrefix = '[ ]';
if (/^\d+\./.test(newPrefix)) newPrefix = `1. `; // a simple approach, otherwise it needs to parse the lines after the current line
// a simple approach, otherwise it needs to parse the lines after the current line
if (/^\d+\./.test(prefix)) newPrefix = `1. ${newPrefix.slice(newPrefix.indexOf('.') + 2)}`;
newPrefix = newPrefix.replace('[x]', '[ ]');
const newLine = `\n${indention}${newPrefix}`;
textarea.value = value.slice(0, selStart) + newLine + value.slice(selEnd);
textarea.setSelectionRange(selStart + newLine.length, selStart + newLine.length);