Completion command => Add script command for zsh and bash

NodeApp/src/commander/completion/subcommands/CompletionScriptCommand.ts

+import CommanderCommand from '../../CommanderCommand';
+import { Argument }     from 'commander';
+
+
+class CompletionScriptCommand extends CommanderCommand {
+    protected commandName: string = 'script';
+
+    protected defineCommand() {
+        this.command.description('generate script completion')
+            .addArgument(new Argument('<shell>', 'shell completion format').choices([ 'bash', 'zsh' ]))
+            .action(this.commandAction.bind(this));
+    }
+
+    private bashCompletionScript() {
+        console.log(`
+#/usr/bin/env bash
+###-begin-dojo-completions-###
+#
+# dojo command completion script for bash
+#
+# Installation: dojo completion bash
+#
+function _dojo_completions()
+{
+    latest="\${COMP_WORDS[$COMP_CWORD]}"
+    words=$(dojo completion get --shell bash \${COMP_WORDS[@]})
+
+    COMPREPLY=($(compgen -W "$words" -- $latest))
+    return 0
+}
+complete -F _dojo_completions dojo
+###-end-dojo-completions-###
+        `);
+    }
+
+    private zshCompletionScript() {
+        console.log(`
+#compdef dojo
+###-begin-dojo-completions-###
+#
+# dojo command completion script for zsh
+#
+# Installation: dojo completion zsh
+#
+_dojo_completions()
+{
+  local reply
+  local si=$IFS
+  IFS=$'
+' reply=($(dojo completion get --shell zsh \${words[@]}))
+  IFS=$si
+  _describe 'values' reply
+}
+compdef _dojo_completions dojo
+###-end-dojo-completions-###
+        `);
+    }
+
+    protected async commandAction(shell: 'bash' | 'zsh'): Promise<void> {
+        switch ( shell ) {
+            case 'bash':
+                this.bashCompletionScript();
+                break;
+            case 'zsh':
+                this.zshCompletionScript();
+                break;
+            default:
+                console.error('Unsupported shell completion format');
+                break;
+        }
+    }
+}
+
+
+export default new CompletionScriptCommand();
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