reviewit/dist/server/git-diff-tui.js

A lightweight command-line tool that spins up a local web server to display Git commit diffs in a GitHub-like Files changed view

import simpleGit from 'simple-git';
import { validateDiffArguments, createCommitRangeString } from '../cli/utils.js';
export async function loadGitDiff(targetCommitish, baseCommitish) {
    // Validate arguments
    const validation = validateDiffArguments(targetCommitish, baseCommitish);
    if (!validation.valid) {
        throw new Error(validation.error);
    }
    const git = simpleGit();
    let diff;
    // Handle target special chars (base is always a regular commit)
    if (targetCommitish === 'working') {
        // Show unstaged changes (working vs staged)
        diff = await git.diff(['--name-status']);
    }
    else if (targetCommitish === 'staged') {
        // Show staged changes against base commit
        diff = await git.diff(['--cached', baseCommitish, '--name-status']);
    }
    else if (targetCommitish === '.') {
        // Show all uncommitted changes against base commit
        diff = await git.diff([baseCommitish, '--name-status']);
    }
    else {
        // Both are regular commits: standard commit-to-commit comparison
        diff = await git.diff([
            createCommitRangeString(baseCommitish, targetCommitish),
            '--name-status',
        ]);
        if (!diff.trim()) {
            // Try without parent (for initial commit)
            const diffInitial = await git.diff([targetCommitish, '--name-status']);
            if (!diffInitial.trim()) {
                throw new Error('No changes found in this commit');
            }
            diff = diffInitial;
        }
    }
    const fileChanges = diff
        .split('\n')
        .filter((line) => line.trim())
        .map((line) => {
        const [status, ...pathParts] = line.split('\t');
        const path = pathParts.join('\t');
        return { status, path };
    });
    // Get diff for each file individually
    const fileDiffs = await Promise.all(fileChanges.map(async ({ status, path }) => {
        let fileDiff = '';
        // Handle individual file diffs (base is always a regular commit)
        if (targetCommitish === 'working') {
            // Show unstaged changes (working vs staged)
            fileDiff = await git.diff(['--', path]);
        }
        else if (targetCommitish === 'staged') {
            // Show staged changes against base commit
            fileDiff = await git.diff(['--cached', baseCommitish, '--', path]);
        }
        else if (targetCommitish === '.') {
            // Show all uncommitted changes against base commit
            fileDiff = await git.diff([baseCommitish, '--', path]);
        }
        else {
            try {
                // Both are regular commits: standard commit-to-commit comparison
                fileDiff = await git.diff([
                    createCommitRangeString(baseCommitish, targetCommitish),
                    '--',
                    path,
                ]);
            }
            catch {
                // For new files or if parent doesn't exist
                fileDiff = await git.diff([targetCommitish, '--', path]);
            }
        }
        const lines = fileDiff.split('\n');
        let additions = 0;
        let deletions = 0;
        lines.forEach((line) => {
            if (line.startsWith('+') && !line.startsWith('+++'))
                additions++;
            if (line.startsWith('-') && !line.startsWith('---'))
                deletions++;
        });
        return {
            path,
            status: status,
            diff: fileDiff,
            additions,
            deletions,
        };
    }));
    return fileDiffs;
}