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feat: smart transpose char before and after newline

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In emacs, transpose chars at beginning or end of line
work like beginning or end of string.
This commit is contained in:
gholk 2026-04-27 23:53:29 +08:00
parent 345f1dbef5
commit ff9daffd83
1 changed files with 14 additions and 2 deletions
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16
src/lib/editor.ts
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@ -89,10 +89,22 @@ export const tab_insert = wrap_input((text, selectionStart, selectionEnd) => {
export const transpose_chars = wrap_input(
(text, selectionStart) => {
if (text.length < 2) return [null, null, null]
// When at the beginning of the text, transpose the first and second characters
const eolChars = ["\n", "\r"]
// When at the beginning of the text or line,
// transpose the first and second characters
if (selectionStart === 0) selectionStart = 1
// When at the end of the text, transpose the last and second-to-last characters
else if (eolChars.includes(text.charAt(selectionStart-1))) {
selectionStart += 1
}
// When at the end of the text or line,
// transpose the last and second-to-last characters
if (selectionStart >= text.length) selectionStart = text.length - 1
else if (eolChars.includes(text.charAt(selectionStart))) {
selectionStart -= 1
}
text =
text.substring(0, selectionStart - 1) +