Function iterFormatCombinedDiffHunkUnified

src/iterFormatHunkUnified.ts:103–135

(
    context: Context,
    hunkParts: HunkPart[],
    lineChanges: (Change[] | null)[]
)

 * --cc or --combined options, which are defaults for merge commits.
 */
export async function* iterFormatCombinedDiffHunkUnified(
    context: Context,
    hunkParts: HunkPart[],
    lineChanges: (Change[] | null)[]
): AsyncIterable<FormattedString> {
    const lineWidth = context.SCREEN_WIDTH;

    // The final hunk part shows the current state of the file, so we just
    // display that with additions and deletions highlighted.
    const { fileName, lines, startLineNo } = hunkParts[hunkParts.length - 1];
    let lineNo = startLineNo;
    let numDeletes = 0;

    for (let i = 0; i < lines.length; i++) {
        const line = lines[i];
        const prefix = line?.slice(0, 1) ?? null;
        if (prefix == '-') {
            numDeletes++;
        } else {
            lineNo -= numDeletes;
            numDeletes = 0;
        }
        yield* formatAndFitHunkLine(
            context,
            lineWidth,
            fileName,
            lineNo,
            line,
            lineChanges[i]
        );
        lineNo++;
    }
}