added main dart completion

completion/available/dart.completion.bash

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# ------------------------------------
+# Original Credits : https://github.com/claudiodangelis/dart-bash_completion
+# ------------------------------------
+if command -v dart > /dev/null; then
+    __dart() {
+        local cur prev opts
+        COMPREPLY=()
+        cur="${COMP_WORDS[COMP_CWORD]}"
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+        # Options
+        opts="--help --checked --package-root --version"
+
+        if [[ ${cur} == -* ]] ; then
+            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+            return 0
+        elif [[ ${prev} != *.dart ]] ; then
+            local dart_scripts=$(for d in `ls  -1 *.dart 2>/dev/null`; do echo ${d}; done)
+            COMPREPLY=( $(compgen -W "${dart_scripts}" -- ${cur}) )
+        else
+            COMPREPLY=()
+            return 0
+        fi
+    }
+
+    complete -o default -F __dart dart
+
+fi