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44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
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import { replaceBetween } from './utils';
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export default ({ getState, item, setState }) => {
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let { text } = getState();
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const { selection } = getState();
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text = text || '';
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let newText;
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let newSelection;
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// Ignore multi-character selections.
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// NOTE: I was on the fence about whether more appropriate behavior would be
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// to add the list prefix (e.g. '-', '1.', '#', '##', '###') at the
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// beginning of the line where the selection begins, but for now I think
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// it's more natural to just ignore it in this case. If after using this
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// editor for a while it turns out the other way is more natural, that's
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// fine by me!
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if (selection.start !== selection.end) {
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return;
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}
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const spaceForPrefix = item.prefix.length + 1;
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const isNewLine = text.substring(selection.start - 1, selection.start) === '\n';
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if (isNewLine) { // We're at the start of a line
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newText = replaceBetween(text, selection, `${item.prefix} `);
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newSelection = { start: selection.start + spaceForPrefix, end: selection.start + spaceForPrefix };
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} else { // We're in the middle of a line
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// NOTE: It may be more natural for the prefix (e.g. '-', '1.', '#', '##')
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// to be prepended at the beginning of the line where the selection is,
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// rather than creating a new line (which is the behavior implemented here).
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// If the other way is more natural, that's fine by me!
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newText = replaceBetween(text, selection, `\n${item.prefix} `);
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newSelection = {
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start: selection.start + spaceForPrefix + 1,
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end: selection.start + spaceForPrefix + 1,
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};
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}
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setState({ text: newText }, () => {
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setTimeout(() => {
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setState({ selection: newSelection });
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}, 300);
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});
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};
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