react-diff-view/esm/hooks/useSourceExpansion.js

A git diff component to consume the git unified diff output.

import { useEffect, useMemo } from 'react';
import { expandFromRawCode } from '../utils';
import { useCollection } from './helpers';
export default function useSourceExpansion(hunks, oldSource) {
    const { collection: expandedRanges, clear, push } = useCollection();
    // eslint-disable-next-line react-hooks/exhaustive-deps
    useEffect(clear, [hunks, oldSource]);
    const linesOfOldSource = useMemo(() => (Array.isArray(oldSource) ? oldSource : (oldSource || '').split('\n')), [oldSource]);
    const renderingHunks = useMemo(() => {
        if (!linesOfOldSource.length) {
            return hunks;
        }
        return expandedRanges.reduce((hunks, [start, end]) => expandFromRawCode(hunks, linesOfOldSource, start, end), hunks);
    }, [linesOfOldSource, hunks, expandedRanges]);
    return [
        renderingHunks,
        (start, end) => push([start, end]),
    ];
}
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