commit-msg

#!/usr/bin/env node

'use strict';

var fs = require('fs');

module.exports.validateCommitMessage = (message) => {
    let errorCode = 0;
    let lines = message.split('\n');
    let line = lines.shift();

    if (!line) {
        return errorCode;
    }

    if (line.length > 72) {
        console.error(`Commit message title is ${line.length} characters long; Limit it to 72 characters`);
        errorCode = 1;
    }

    if (!/^[A-Z]/.test(line)) {
        console.error('Capitalize the commit message');
        errorCode = 1;
    }

    if ('.' === line.slice(-1)) {
        console.error('Do not end the commit message with a period');
        errorCode = 1;
    }

    line = lines.shift();
    if (line && line.length > 0) {
        console.error('Second commit message line is not empty');
        errorCode = 1;
    }

    lines.some((line) => {
        if (line === '# ------------------------ >8 ------------------------') {
            return true;
        }

        if (line && line.charAt(0) !== '#' && line.length > 72) {
            console.error(`Commit message body line is ${line.length} characters long; Limit it to 72 characters`);
            errorCode = 1;
        }
    });

    return errorCode;
};

fs.readFile(process.argv[2], (_, buffer) => {
    process.exit(module.exports.validateCommitMessage(buffer.toString()));
});