commit bash-20130301 snapshot

examples/complete/complete.gnu-longopt

@@ -0,0 +1,43 @@
+#
+# Originally from:
+#
+#Message-ID: <3B13EC65.179451AE@wanadoo.fr>
+#Date: Tue, 29 May 2001 20:37:25 +0200
+#From: Manu Rouat <emmanuel.rouat@wanadoo.fr>
+#Subject: [bash] Universal command options completion?
+#
+#
+#In the recent versions of bash (after 2.04) programmable 
+#completion is available. A useful completion function
+#is , for a particular command, to enumerate all flags
+#that can be used in the command. Now, most GNU unix 
+#commands have so-called 'long options' for example:
+#
+#ls --color=always --no-group --size
+#
+#and these are all listed when you issue a '--help' flag.
+#So the idea is to use that, then parse the output of the
+#'--help' and reinject this to compgen. The basis of the 
+#following 'universal' completion funtion was the _configure_func'
+#written by Ian McDonnald (or is it Chet Ramey ?)
+#A dedicated function will always be better, but this is quite
+#convenient. I chose to use 'long options' because they are
+#easy to parse and explicit too (it's the point I guess...)
+#Lots of room for improvement !
+
+_longopt_func ()
+{
+    case "$2" in
+	-*)	;;
+	*)	return ;;
+    esac
+
+    case "$1" in
+	\~*)	eval cmd=$1 ;;
+	*)	cmd="$1" ;;
+    esac
+    COMPREPLY=( $("$cmd" --help | sed  -e '/--/!d' -e 's/.*--\([^ ]*\).*/--\1/'| \
+grep ^"$2" |sort -u) )
+}
+
+complete  -o default -F _longopt_func ldd wget bash id info # some examples that work