Cross-platform git hooks for Node.js

README.md

Here's how this works:

• Include a git_hooks/ directory in your project, with these two files (plus other hooks if you want, written in a similar style).
• Add "npm" to your devDependencies in package.json, so that the pre-commit hook can do its magic.
• Add test and lint scripts to your package.json, e.g.

    "scripts": {
        "test": "mocha",
        "lint": "jshint ./lib --show-non-errors"
    }

• Whenever you clone the repository, run node git_hooks/link.js to symlink the hooks stored in the repository, in git_hooks, to the hidden .git/hooks directory.

git_hooks∕link.js

var fs = require("fs");
var path = require("path");

["applypatch-msg", "commit-msg", "post-commit", "post-receive", "post-update", "pre-applypatch", "pre-commit",
 "prepare-commit-msg", "pre-rebase", "update"].forEach(function (hook) {
    var hookInSourceControl = path.resolve(__dirname, hook);

    if (path.existsSync(hookInSourceControl)) {
        var hookInHiddenDirectory = path.resolve(__dirname, "..", ".git", "hooks", hook);

        if (path.existsSync(hookInHiddenDirectory)) {
            fs.unlinkSync(hookInHiddenDirectory);
        }

        fs.linkSync(hookInSourceControl, hookInHiddenDirectory);
    }
});

git_hooks∕pre-commit

#!/usr/bin/env node

var npm = require("npm");

npm.load(function (err) {
    if (err) {
        throw err;
    }

    npm.commands.test(function (err) {
        if (err) {
            process.exit(1);
        }

        npm.commands["run-script"](["lint"], function (err) {
            if (err) {
                process.exit(1);
            }
        });
    });
});

Nifty! Should probably nest the "lint" command underneath the "test" command. This way, you don't exit in the middle of a test if lint fails, or vice-versa.

Thanks @isaacs; updated!

Instead of running node git_hooks/link.js manually after each clone, how about making it a part of npm install?

Does it work on windows?

To test whether a file exists before doing something with it is now considered to be an anti-pattern!
http://nodejs.org/docs/latest/api/all.html#all_fs_exists_path_callback

Instead of a symlink, since got very 2.9 you set hooksPath in local config. 'git config core.hooksPath ./git_hooks'