git-js example

example.js

// Imports _____________________________________________________________________

const git = require('git-js');

// Setup _______________________________________________________________________

git.print_output = false;

// Functions ___________________________________________________________________

function commitToAlterMap(commit) {
    const alters = {
        insertions: 0,
        deletions: 0,
        changes: 0,
    };

    commit.split(', ').forEach(alter => {
        alter = alter.trim();
        if (alter === '') {
            return;
        }

        let key = 'changes';
        if (alter.indexOf('(+)') !== -1) {
            key = 'insertions';
        }
        else if (alter.indexOf('(-)') !== -1) {
            key = 'deletions';
        }

        const count = parseInt(alter.match(/[0-9]+/)[0], 10);
        alters[key] = alters[key] + count;
    });

    return alters;
}

function reduceAlters(previous, current) {
    for (let key in current) {
        previous[key] = previous[key] + current[key];
    }

    return previous;
}

function getAlters(author, since) {
    const params = `--stat --pretty="" --no-merges --author="${author}" --since="${since}"`;
    const alters = git.log(params)
        .split('\n')
        .filter(line => line.indexOf('|') === -1)
        .map(commitToAlterMap)
        .reduce(reduceAlters);

    return alters;
}

function printAlters(author, since) {
    const alters = getAlters(author, since);

    console.log('Insertions:\t', alters.insertions);
    console.log('Deletions:\t', alters.deletions);
    console.log('Changes:\t', alters.changes);
}

function getCommits(author, since) {
    const params = `--no-merges --pretty="oneline" --author="${author}" --since="${since}"`;
    const commits = git.log(params)
        .split('\n')
        .map(line => line.split(' ')[0])
        .filter(line => line.trim() !== '');

    return commits;
}

function getFilesForCommit(commit_hash) {
    return git.diffTree(`--no-commit-id --name-only -r ${commit_hash}`).split('\n');
}

function getFilesTouched(author, since, ignored_extensions = ['svg', 'png', 'css', 'json', 'html', 'wav', 'ogg', 'mp3', 'yaml']) {
    const files_touched = [];
    const commits = getCommits(author, since);

    commits.forEach((commit_hash) => {
        const files_changed_in_commit = getFilesForCommit(commit_hash);
        files_changed_in_commit.forEach((file_name) => {
            // Skip duplicates
            if (files_touched.includes(file_name)) {
                return;
            }

            // Skip ignored extensions
            const parts = file_name.split('.');
            const extension = parts[parts.length - 1];
            if (ignored_extensions.includes(extension)) {
                return;
            }

            files_touched.push(file_name);
        });
    });

    return files_touched.sort();
}

function printFilesTouched(author, since) {
    const files = getFilesTouched(author, since);

    console.log('Files Touched:');
    console.log(files.join('\n'));
}

function printReport(author, since) {
    console.log('Git Report');
    console.log('');
    printAlters(author, since);
    console.log('');
    printFilesTouched(author, since)
}

// Initialization ______________________________________________________________

printReport('user@domain.com', '2016-01-01');

Output:

Git Report

Insertions:  14387
Deletions:   24692
Changes:     1072

Files Touched:

.eslintrc
base/View.php
classes/Client.php
web/.htaccess
…etc.