Convert a git commit log into JSON

git-log2json.js

#!/usr/bin/env node
//
// Converts a git log into a JSON array including the full commit message.
//

var cp = require('child_process');

var formats = {
    author: '%an',
    email: '%ae',
    time: '%ad',
    sha: '%H',
    message: '%B'
};

var field_sep = '--------FIELD----------';
var commit_sep = '============COMMIT=============';

var fields = Object.keys(formats);

var fmt = '';
fields.forEach(function(f) {
    fmt += formats[f] + field_sep;
});

fmt += commit_sep;

var child = cp.exec('git log --reverse --pretty="' + fmt + '"', {maxBuffer: 1024*1024*1024}, function(error, stdout, stderr) {
    if (error) {
        console.error(error);
        throw(error);
    }
    var commits = stdout.split(commit_sep + '\n');
    commits.pop(); // drop empty line
    var objs = commits.map(function(c) {
        var L = c.split(field_sep);
        var o = {};

        for (var i = 0; i < fields.length; ++i) {
            o[fields[i]] = L[i];
        }
        o.user = o.email.split('@')[0];
        return o;
    });
    console.log(JSON.stringify(objs, null, 4));
});