git.r.bdr.sh - rbdr/blog/blob - bin/blog.js

   1 #!/usr/bin/env node
   2 'use strict';
   3
   4 const Config = require('../config/config');
   5 const Blog = require('..');
   6 const Minimist = require('minimist');
   7
   8 const internals = {
   9   blog: new Blog(Config),
  10   expectedKeys: ['add', 'update', 'publish'],
  11
  12   // Application entry point. Reads arguments and calls the
  13   // corresponding method from the blog lib
  14
  15   async main() {
  16
  17     try {
  18       const parsedArguments = this._parseArguments();
  19
  20       for (const argument in parsedArguments) {
  21         if (parsedArguments.hasOwnProperty(argument)) {
  22
  23           const value = parsedArguments[argument];
  24
  25           if (argument === 'add') {
  26             await internals.blog.add(value);
  27             return;
  28           }
  29
  30           if (argument === 'update') {
  31             await internals.blog.update(value);
  32             return;
  33           }
  34
  35           if (argument === 'publish') {
  36             await internals.blog.publish(value);
  37             return;
  38           }
  39         }
  40       }
  41       console.log('Not yet implemented');
  42     }
  43     catch (err) {
  44       console.error(err.message || err);
  45       this._printUsage();
  46       process.exit(1);
  47     }
  48   },
  49
  50   // Parses arguments and returns them if valid. otherwise Throws
  51
  52   _parseArguments() {
  53
  54     const parsedArguments = Minimist(process.argv.slice(2));
  55
  56     if (!this._areArgumentsValid(parsedArguments)) {
  57       throw new Error(internals.strings.invalidArguments);
  58     }
  59
  60     return parsedArguments;
  61   },
  62
  63   // Checks if the arguments are valid, returns a boolean value.
  64
  65   _areArgumentsValid(parsedArguments) {
  66
  67     const argumentKeys = Object.keys(parsedArguments);
  68
  69     return argumentKeys.some((key) => internals.expectedKeys.indexOf(key) >= 0);
  70   },
  71
  72   // Prints the usage to stderr
  73
  74   _printUsage() {
  75
  76     console.error('\nUsage:\n');
  77     console.error('blog --add path/to/blog_post\t\t(creates new blog post)');
  78     console.error('blog --update path/to/blog_post\t(updates latest blog post)');
  79     console.error('blog --publish \t\t\t(publishes the blog)');
  80   }
  81 };
  82
  83 // Add the strings, added after declaration so they can consume the
  84 // internals object.
  85
  86 internals.strings = {
  87   invalidArguments: `Invalid Arguments, expecting one of: ${internals.expectedKeys.join(', ')}`
  88 };
  89
  90
  91
  92 internals.main();