formatted grunt completion and used helper function

completion/available/grunt.completion.bash

@@ -41,35 +41,39 @@
 # eval "$(grunt --completion=bash)"
 
 # Search the current directory and all parent directories for a gruntfile.
-function _grunt_gruntfile() {
-  local curpath="$PWD"
-  while [[ "$curpath" ]]; do
-    for gruntfile in "$curpath/"{G,g}runtfile.{js,coffee}; do
-      if [[ -e "$gruntfile" ]]; then
-        echo "$gruntfile"
-        return
-      fi
-    done
-    curpath="${curpath%/*}"
-  done
-  return 1
-}
 
-# Enable bash autocompletion.
-function _grunt_completions() {
-  # The currently-being-completed word.
-  local cur="${COMP_WORDS[COMP_CWORD]}"
-  # The current gruntfile, if it exists.
-  local gruntfile="$(_grunt_gruntfile)"
-  # The current grunt version, available tasks, options, etc.
-  local gruntinfo="$(grunt --version --verbose 2>/dev/null)"
-  # Options and tasks.
-  local opts="$(echo "$gruntinfo" | awk '/Available options: / {$1=$2=""; print $0}')"
-  local compls="$(echo "$gruntinfo" | awk '/Available tasks: / {$1=$2=""; print $0}')"
-  # Only add -- or - options if the user has started typing -
-  [[ "$cur" == -* ]] && compls="$compls $opts"
-  # Tell complete what stuff to show.
-  COMPREPLY=($(compgen -W "$compls" -- "$cur"))
-}
+if _command_exists grunt
+then
+    function _grunt_gruntfile() {
+        local curpath="$PWD"
+        while [[ "$curpath" ]]; do
+            for gruntfile in "$curpath/"{G,g}runtfile{.js,.coffee,}; do
+                if [[ -e "$gruntfile" ]]; then
+                    echo "$gruntfile"
+                    return
+                fi
+            done
+            curpath="${curpath%/*}"
+        done
+        return 1
+    }
 
-complete -o default -F _grunt_completions grunt
+    # Enable bash autocompletion.
+    function _grunt_completions() {
+        # The currently-being-completed word.
+        local cur="${COMP_WORDS[COMP_CWORD]}"
+        # The current gruntfile, if it exists.
+        local gruntfile="$(_grunt_gruntfile)"
+        # The current grunt version, available tasks, options, etc.
+        local gruntinfo="$(grunt --version --verbose 2>/dev/null)"
+        # Options and tasks.
+        local opts="$(echo "$gruntinfo" | awk '/Available options: / {$1=$2=""; print $0}')"
+        local compls="$(echo "$gruntinfo" | awk '/Available tasks: / {$1=$2=""; print $0}')"
+        # Only add -- or - options if the user has started typing -
+        [[ "$cur" == -* ]] && compls="$compls $opts"
+        # Tell complete what stuff to show.
+        COMPREPLY=($(compgen -W "$compls" -- "$cur"))
+    }
+
+    complete -o default -F _grunt_completions grunt
+fi