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composer: auto-complete word at carret position

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This commit is contained in:
Simon Ser 2021-06-30 21:50:55 +02:00
parent b289fd10b7
commit 856dd021e2
1 changed files with 32 additions and 11 deletions
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43
components/composer.js
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@ -30,30 +30,51 @@ export default class Composer extends Component {
}
handleInputKeyDown(event) {
let input = event.target;
if (!this.props.autocomplete || event.key !== "Tab") {
return;
}
let text = this.state.text;
let i;
for (i = text.length - 1; i >= 0; i--) {
if (text[i] === " ") {
break;
}
}
let prefix = text.slice(i + 1);
if (!prefix) {
if (input.selectionStart !== input.selectionEnd) {
return;
}
event.preventDefault();
let repl = this.props.autocomplete(prefix);
let carretIndex = input.selectionStart;
let text = this.state.text;
let wordStart;
for (wordStart = carretIndex - 1; wordStart >= 0; wordStart--) {
if (text[wordStart] === " ") {
break;
}
}
wordStart++;
let wordEnd;
for (wordEnd = carretIndex; wordEnd < text.length; wordEnd++) {
if (text[wordEnd] === " ") {
break;
}
}
let word = text.slice(wordStart, wordEnd);
if (!word) {
return;
}
let repl = this.props.autocomplete(word);
if (!repl) {
return;
}
text = text.slice(0, i + 1) + repl;
text = text.slice(0, wordStart) + repl + text.slice(wordEnd);
input.value = text;
input.selectionStart = wordStart + repl.length;
input.selectionEnd = input.selectionStart;
this.setState({ text });
}