@twilio-labs/languagetool-cli/dist/lib/parseGitPatch.js

Run LanguageTool for linting Markdown files during CI

export function getChangedLineNumbersFromPatch(patch) {
    const fileLinesRegex = /^@@ -([0-9]*),?\S* \+([0-9]*),?/;
    const lineNumbersInDiff = [];
    if (!patch)
        return [];
    splitIntoParts(patch.split("\n"), "@@ ").forEach((lines) => {
        const fileLinesLine = lines.shift();
        const matches = fileLinesLine.match(fileLinesRegex);
        if (!matches)
            return [];
        const [, a, b] = matches;
        let nA = parseInt(a);
        let nB = parseInt(b);
        lines.forEach((line) => {
            if (line.startsWith("+")) {
                nA--;
                lineNumbersInDiff.push(nB);
            }
            else if (line.startsWith("-")) {
                nB--;
            }
            nA++;
            nB++;
        });
    });
    return lineNumbersInDiff;
}
function splitIntoParts(lines, separator) {
    const parts = [];
    let currentPart = undefined;
    lines.forEach((line) => {
        if (line.startsWith(separator)) {
            if (currentPart) {
                parts.push(currentPart);
            }
            currentPart = [line];
        }
        else if (currentPart) {
            currentPart.push(line);
        }
    });
    if (currentPart) {
        parts.push(currentPart);
    }
    return parts;
}
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