prepare-commit-msg git hook

prepare-commit-msg

#!/usr/bin/env node

let exec = require('child_process').exec,
    fs = require('fs')

const messagePath = process.cwd() + '/.git/COMMIT_EDITMSG';

// look for current branch name
exec("git branch | grep '*'",
    function (err, output) {
        if (err) {
            process.exit(0);
        }

        const originalCommitMsg = fs.readFileSync(messagePath);
        const branchName = output.replace('* ', '').replace('\n', '');
   		
   		// '(no branch)' indicates we are in a rebase or other non-HEAD scenario
        if (branchName === '(no branch)') {
            process.exit(0);
        }
        
        const ticketNumber = (/((CLICKUP|DEV)-?\d+)/i.exec(branchName) || [''])[0]
        const ticketNumberInPreviousMessage = (/\[((CLICKUP|DEV)-?\d+)\]/.exec(originalCommitMsg) || [''])[1];
		
        let ticketNumberString = '';

        if (ticketNumberInPreviousMessage !== ticketNumber) {
            ticketNumberString = ticketNumber ? `[${ticketNumber}]: ` : '';
        }

        console.log(`branch name: ${branchName}, extracted ticket name: ${ticketNumber}`);

        const newCommitMsg = `${ticketNumberString}${originalCommitMsg}`;
        fs.writeFileSync(messagePath, newCommitMsg);
        process.exit(0);

    }
);