add bash completion for ncmpcpp

doc/ncmpcpp-completion.bash

@@ -0,0 +1,34 @@
+# Installation:
+# - If you have system bash completion, place this in /etc/bash_completion.d or
+#   source it from $HOME/.bash_completion
+# - If you don't have system bash completion, source this from your .bashrc
+
+ _ncmpcpp ()
+{
+    local cur prev cmds opts
+
+    cur="$2"
+    prev="$3"
+    cmds=`ncmpcpp --help 2>&1 | awk '/^  [a-z]+ /{print $1}'`;
+    opts="`ncmpcpp --help 2>&1 | awk '/^  -.+,/{print $1 "\n" $2}' | sed -e 's/,//;$a--now-playing'`"
+
+    case "$prev" in
+        ncmpcpp)
+        COMPREPLY=($(compgen -W '$opts $cmds' -- "$cur"))
+        ;;
+        --port|-p|--host|-h)
+        COMPREPLY=()
+        ;;
+        --help|-?|--version|-v|--now-playing)
+        return
+        ;;
+        next|pause|play|prev|stop|toggle|volume)
+        opts="`echo $opts | sed -e 's/--port//;s/--host//;s/-p//;s/-h//'`"
+        COMPREPLY=($(compgen -W '$opts' -- "$cur"))
+        ;;
+        *)
+        COMPREPLY=($(compgen -W '$opts $cmds' -- "$cur"))
+        ;;
+    esac
+}
+complete -F _ncmpcpp ncmpcpp