39 lines
1.0 KiB
JavaScript
39 lines
1.0 KiB
JavaScript
import { diffLines } from 'diff';
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import { defaultDiffOptions } from '../editor_options';
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// See: https://gitlab.com/gitlab-org/frontend/rfcs/-/issues/20
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// eslint-disable-next-line import/prefer-default-export
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export const computeDiff = (originalContent, newContent) => {
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// prevent EOL changes from highlighting the entire file
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const changes = diffLines(
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originalContent.replace(/\r\n/g, '\n'),
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newContent.replace(/\r\n/g, '\n'),
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defaultDiffOptions,
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);
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let lineNumber = 1;
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return changes.reduce((acc, change) => {
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const findOnLine = acc.find(c => c.lineNumber === lineNumber);
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if (findOnLine) {
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Object.assign(findOnLine, change, {
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modified: true,
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endLineNumber: lineNumber + change.count - 1,
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});
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} else if ('added' in change || 'removed' in change) {
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acc.push({
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...change,
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lineNumber,
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modified: undefined,
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endLineNumber: lineNumber + change.count - 1,
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});
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}
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if (!change.removed) {
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lineNumber += change.count;
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}
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return acc;
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}, []);
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};
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