Add CLI

wtfpython

@@ -0,0 +1,85 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const obj = require('through2').obj;
+const pager = require('default-pager');
+const msee = require('msee');
+const join = require('path').join;
+const boxen = require('boxen');
+const chalk = require('chalk');
+const updateNotifier = require('update-notifier');
+const pkg = require('./package.json');
+const meow = require('meow');
+
+const cli = meow([
+  'Usage',
+  '  bash-handbook',
+  '',
+  'Options',
+  '  --lang, -l  Translation language',
+  '',
+  'Examples',
+  '  bash-handbook',
+  '  bash-handbook --lang pt-br'
+], {
+  string: [
+    'lang'
+  ],
+  alias: {
+    l: 'lang',
+    h: 'help'
+  },
+  default: {
+    lang: ''
+  }
+});
+
+const boxenOpts = {
+  borderColor: 'yellow',
+  margin: {
+    bottom: 1
+  },
+  padding: {
+    right: 1,
+    left: 1
+  }
+};
+
+const mseeOpts = {
+  paragraphEnd: '\n\n'
+};
+
+const notifier = updateNotifier({ pkg });
+
+process.env.PAGER = process.env.PAGER || 'less';
+process.env.LESS  = process.env.LESS  || 'FRX';
+
+const lang = cli.flags.lang
+  .toLowerCase()
+  .split('-')
+  .map((l, i) => i === 0 ? l : l.toUpperCase())
+  .join('-');
+
+const translation = join(__dirname, !lang ? './README.md' : `./README-${lang}.md`);
+
+fs.stat(translation, function (err, stats) {
+  if (err) {
+    console.log('The %s translation does not exist', chalk.bold(lang));
+    return;
+  }
+
+  fs.createReadStream(translation)
+    .pipe(obj(function (chunk, enc, cb) {
+      const message = [];
+
+      if (notifier.update) {
+        message.push(`Update available: {green.bold ${notifier.update.latest}} {dim current: ${notifier.update.current}}`);
+        message.push(`Run {blue npm install -g ${pkg.name}} to update.`);
+        this.push(boxen(message.join('\n'), boxenOpts));
+      }
+
+      this.push(msee.parse(chunk.toString(), mseeOpts));
+      cb();
+    }))
+    .pipe(pager());
+});