break part of _gcc() into _longopt() and use this for ldd, wget, bash, id and

info completion, as demonstrated by Manu Rouat <emmanuel.rouat@wanadoo.fr>

bash_completion

@@ -1,6 +1,6 @@
 #   bash_completion - some programmable completion functions for bash 2.05a
 #
-#   $Id: bash_completion,v 1.119 2002/02/15 23:53:58 ianmacd Exp $
+#   $Id: bash_completion,v 1.120 2002/02/16 01:13:00 ianmacd Exp $
 #
 #   Copyright (C) Ian Macdonald <ian@caliban.org>
 #
@@ -1719,6 +1719,34 @@ _psql ()
 }
 [ "$have" ] && complete -F _psql psql
 
+_longopt()
+{
+	case "$2" in
+	-*)
+		;;
+	*)
+		return 0
+		;;
+	esac
+
+	case "$1" in
+	\~*)
+		eval cmd=$1
+		;;
+        *)
+		cmd="$1"
+		;;
+	esac
+
+	[ "$4" = no_completion ] && return 0
+
+	COMPREPLY=( $( "$cmd" --help | sed  -e '/--/!d' \
+					    -e 's/.*--\([^ ]*\).*/--\1/'| \
+		       grep ^"$2" | sort -u ) )
+	unset cmd
+}
+complete -o default -F _longopt ldd wget bash id info
+
 # gcc(1) completion by Phil Edwards <phil@jaj.com>
 #
 # The only unusual feature is that we don't parse "gcc --help -v" output
@@ -1732,26 +1760,13 @@ _psql ()
 have gcc &&
 _gcc()
 {
-	local cc gcc backend
+	local cc cmd backend
 
-	case "$2" in
-	-*)
-		;;
-	*)
-		return
-		;;
-	esac
+	[[ "$2" != -* ]] && return 0
 
-	case "$1" in
-	\~*)
-		eval gcc=$1
-		;;
-        *)
-		gcc="$1"
-		;;
-	esac
+	_longopt "$1" "$2" "" no_completion
 
-	case "$gcc" in
+	case "$cmd" in
 	gcj)
 		backend=jc1
 		;;
@@ -1763,7 +1778,7 @@ _gcc()
 		;;
     esac
 
-    cc=$( $gcc -print-prog-name=$backend )
+    cc=$( $cmd -print-prog-name=$backend )
 
     # sink stderr:
     # for C/C++/ObjectiveC it's useless