Add tab completion for bash.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

.lc-completion.bash

@@ -0,0 +1,28 @@
+###-begin-lc-completions-###
+#
+# yargs command completion script
+#
+# Installation: bin/lc completion >> ~/.bashrc
+#    or bin/lc completion >> ~/.bash_profile on OSX.
+#
+_yargs_completions()
+{
+    local cur_word args type_list
+
+    cur_word="${COMP_WORDS[COMP_CWORD]}"
+    args=("${COMP_WORDS[@]}")
+
+    # ask yargs to generate completions.
+    type_list=$(lc --get-yargs-completions "${args[@]}")
+
+    COMPREPLY=( $(compgen -W "${type_list}" -- ${cur_word}) )
+
+    # if no match was found, fall back to filename completion
+    if [ ${#COMPREPLY[@]} -eq 0 ]; then
+      COMPREPLY=( $(compgen -f -- "${cur_word}" ) )
+    fi
+
+    return 0
+}
+complete -F _yargs_completions lc
+###-end-lc-completions-###

lib/cli.js

@@ -1,6 +1,7 @@
 var yargs = require('yargs');
 
 yargs.commandDir('commands')
+  .completion()
   .help()
   .strict()
   .argv;