feat(cli): print shell completion script

bin/docsify

@@ -68,12 +68,14 @@ var argv = require('yargs')
     }),
     handler: (argv) => run.serve(argv.path, argv.open, argv.port)
   })
-  .completion('completion', function (current, argv, done) {
-    return new Promise(function (resolve, reject) {
-      setTimeout(function () {
-        resolve(['init', 'serve'])
-      }, 10)
-    })
+  .command({
+    command: 'completion',
+    alias: 'c',
+    desc: chalk.gray(y18n.__('completion')),
+    builder: {},
+    handler: (argv) => {
+      yargs.showCompletionScript().argv
+    }
   })
   .help()
   .option('help', {

bin/locales/de.json

@@ -1,13 +1,14 @@
 {
-    "usage": "Anwendung",
+    "completion": "Drucke shell Vervollständigungsskript",
+    "epilog": "Dokumentation",
     "group.globaloptions": "Globale Optionen",
+    "help": "Zeige Hilfe an",
     "init": "Erzeuge neue Dokumentation.",
     "init.local": "Kopiere docsify Dateien in lokale Ordner.",
     "init.theme": "Zu verwendende Theme Dateien.",
     "serve": "Lasse lokalen Server zur Webseitenvorschau laufen.",
     "serve.open": "Dokumentation im Standardbrowser öffnen.",
     "serve.port": "Listen port.",
-    "help": "Zeige Hilfe an",
-    "version": "Zeige Versionsnummer an",
-    "epilog": "Dokumentation"
+    "usage": "Anwendung",
+    "version": "Zeige Versionsnummer an"
 }

bin/locales/en.json

@@ -1,13 +1,14 @@
 {
-    "usage": "Usage",
+    "completion": "Print shell completion script",
+    "epilog": "Documentation",
     "group.globaloptions": "Global Options",
+    "help": "Show help",
     "init": "Creates new docs",
     "init.local": "Copy docsify files to local.",
     "init.theme": "Theme file to be used.",
     "serve": "Run local server to preview site.",
     "serve.open": "Open docs in default browser.",
     "serve.port": "Listen port.",
-    "help": "Show help",
-    "version": "Show version number",
-    "epilog": "Documentation"
+    "usage": "Usage",
+    "version": "Show version number"
 }

bin/locales/zh.json

@@ -1,12 +1,12 @@
 {
-    "usage": "例子",
+    "epilog": "文档",
+    "help": "帮助",
     "init": "创建 docs",
     "init.local": "拷贝 docsify 到本地",
     "init.theme": "选择主题",
     "serve": "本地预览",
     "serve.open": "自动打开浏览器",
     "serve.port": "设置端口",
-    "help": "帮助",
-    "version": "当前版本号",
-    "epilog": "文档"
+    "usage": "例子",
+    "version": "当前版本号"
 }