gazeer/src/gazeer.js

Command line interface for the gaze watcher

#!/usr/bin/env node

'use strict';
const path = require('path');
const gaze = require('gaze');
const npmlog = require('npmlog');
const exec = require('exec-sh');

const argv = require('yargs')
  .usage('Usage: gaze -p \'<your pattern1>\' -p \'<your pattern2>\' -c \'<your command1>\' -c \'<your command2>\' \n\n You can use $filepath, $basename, $dirname in command for placeholder')
  .example('gaze -p \'**/*.js\' -c \'babel $filepath -o $dirname/build/$basename\'')
  .demand('p')
  .alias('p', 'pattern')
  .describe('p', 'Files to watch, globbing supported.')
  .demand('c')
  .alias('c', 'command')
  .describe('c', 'Command to run, if multi command specified, it will run in order.')
  .argv;

let patterns;
let commands;

if (typeof argv.pattern === 'string') {
    patterns = [argv.pattern];
} else {
    patterns = argv.pattern.slice(0);
}

if (typeof argv.command === 'string') {
    commands = [argv.command];
} else {
    commands = argv.command.slice(0);
}

function runCommands(cmds) {
    if (cmds.length === 0) {
        npmlog.info('done!');
        return;
    }

    const cmd = cmds.shift();

    npmlog.info('run', '%s', cmd);

    exec(cmd, {
        cwd: process.cwd(),
        env: process.env,
        stdio: 'inherit'
    }, err => {
        if (err) {
            npmlog.error('exit: ', '%s', err);
        }
        runCommands(cmds);
    });
}

gaze(patterns, function (err) {
    if (err) {
        throw new Error(err);
    }

    const fileCount = Object.keys(this.watched()).length;

    npmlog.info('gaze', 'Watching %d file[s] (%s)', fileCount, patterns.join(', '));


    this.on('all', (event, filepath) => {
        npmlog.info('gazeer', '`%s` %s', filepath, event);

        const basename = path.basename(filepath);
        const dirname = path.dirname(filepath);
        const cmds = commands.map(cmd => {
           return cmd.replace(/\$filepath/g, filepath)
                    .replace(/\$basename/g, basename)
                    .replace(/\$dirname/g, dirname);
        });

        runCommands(cmds);
    });
});