added docgen completions

completion/available/docgen.completion.bash

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# ------------------------------------
+# Original Credits : https://github.com/claudiodangelis/dart-bash_completion
+# ------------------------------------
+if command -v docgen > /dev/null; then
+    _docgen() {
+        local cur prev opts
+        COMPREPLY=()
+        cur="${COMP_WORDS[COMP_CWORD]}"
+        prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+        # Options
+        opts="--help --verbose --include-private --no-include-sdk --include-sdk \
+            --parse-sdk --package-root --compile --serve --no-docs --introduction \
+            --out --exclude-lib --no-include-dependent-packages \
+            --include-dependent-packages --sdk --start-page --no-indent-json \
+            --indent-json"
+
+
+        if [[ ${cur} == -* ]] ; then
+            COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+            return 0
+        else
+            COMPREPLY=()
+            return 0
+        fi
+
+    }
+
+    complete -o default -F _docgen docgen
+fi