#!/usr/bin/env node

var optimist = require('optimist')
    .usage('Precompile handlebar templates.\nUsage: $0 template', {
      'f': {
        'type': 'string',
        'description': 'Output File',
        'alias': 'output'
      },
      'k': {
        'type': 'string',
        'description': 'Known helpers',
        'alias': 'known'
      },
      'o': {
        'type': 'boolean',
        'description': 'Known helpers only',
        'alias': 'knownOnly'
      }
    })

    .check(function(argv) {
      var template = argv._[0];
      if (!template) {
        throw 'Must define at least one template or directories.';
      }
      try {
        fs.statSync(argv._[0]);
      } catch (err) {
        throw 'Unable to open template file "' + template + '"';
      }
    });

var fs = require('fs'),
    handlebars = require('../lib/handlebars');

var argv = optimist.argv,
    template = argv._[0];

// Convert the known list into a hash
var known = {};
if (argv.known && !Array.isArray(argv.known)) {
  argv.known = [argv.known];
}
if (argv.known) {
  for (var i = 0, len = argv.known.length; i < len; i++) {
    known[argv.known[i]] = true;
  }
}

// First figure out what our output looks like
fs.readFile(template, 'utf8', function(err, data) {
    if (err) {
        throw err;
    }

    var options = {
      knownHelpers: known,
      knownHelpersOnly: argv.o
    };

    var output = 'Handlebars.template(' + handlebars.precompile(data, options) + ')';
    if (argv.output) {
      fs.writeFileSync(argv.output, output, 'utf8');
    } else {
      console.log(output);
    }
});