Large improvements in yosys-config

yosys-config.in

@@ -1,7 +1,35 @@
-#!/bin/sh
+#!/bin/bash
 
 help() {
-	{ echo; echo "Usage: $0 { --cxx | --cxxflags | --ldflags | --ldlibs }"; } >&2
+	{
+		echo ""
+		echo "Usage: $0 [-exec] [--prefix pf] args.."
+		echo ""
+		echo "Replecement args:"
+		echo "    --cxx         @CXX@"
+		echo "    --cxxflags    $( echo '@CXXFLAGS@' | fmt -w60 | sed ':a;N;$!ba;s/\n/ \\\n                      /g' )"
+		echo "    --ldflags     @LDFLAGS@"
+		echo "    --ldlibs      @LDLIBS@"
+		echo "    --bindir      @BINDIR@"
+		echo "    --datdir      @DATDIR@"
+		echo ""
+		echo "All other args are passed trhough as they are."
+		echo ""
+		echo "Use -exec to call a command instead of generating output. Example usage:"
+		echo ""
+		echo "  yosys-config --exec --cxx --cxxflags --ldflags -o plugin.so -shared plugin.cc --ldlibs"
+		echo ""
+		echo "Use --prefix to change the prefix for the special args from '--' to"
+		echo "something else. Example:"
+		echo ""
+		echo "  yosys-config --prefix @ bindir: @bindir"
+		echo ""
+		echo "The args --bindir and --datdir can be directly followed by a slash and"
+		echo "additional text. Example:"
+		echo ""
+		echo "  yosys-config --datdir/simlib.v"
+		echo ""
+	} >&2
 	exit 1
 }
 
@@ -9,22 +37,61 @@ if [ $# -eq 0 ]; then
 	help
 fi
 
+prefix="--"
+get_prefix=false
+exec_mode=false
+declare -a tokens=()
+
 for opt; do
+	if $get_prefix; then
+		prefix="$opt"
+		get_prefix=false
+		continue
+	fi
 	case "$opt" in
-		--cxx)
-			echo -n '@CXX@ ' ;;
-		--cxxflags)
-			echo -n '@CXXFLAGS@ ' ;;
-		--ldflags)
-			echo -n '@LDFLAGS@ ' ;;
-		--ldlibs)
-			echo -n '@LDLIBS@ ' ;;
-		--help|-\?)
-			help ;;
+		"$prefix"cxx)
+			tokens=( "${tokens[@]}"  @CXX@       ) ;;
+		"$prefix"cxxflags)
+			tokens=( "${tokens[@]}"  @CXXFLAGS@  ) ;;
+		"$prefix"ldflags)
+			tokens=( "${tokens[@]}"  @LDFLAGS@   ) ;;
+		"$prefix"ldlibs)
+			tokens=( "${tokens[@]}"  @LDLIBS@    ) ;;
+		"$prefix"bindir)
+			tokens=( "${tokens[@]}" '@BINDIR@'   ) ;;
+		"$prefix"datdir)
+			tokens=( "${tokens[@]}" '@DATDIR@'   ) ;;
+		"$prefix"bindir/*)
+			tokens=( "${tokens[@]}" '@BINDIR@'"${opt#${prefix}bindir}" ) ;;
+		"$prefix"datdir/*)
+			tokens=( "${tokens[@]}" '@DATDIR@'"${opt#${prefix}datdir}" ) ;;
+		--help|-\?|-h)
+			if [ ${#tokens[@]} -eq 0 ]; then
+				help
+			else
+				tokens=( "${tokens[@]}" "$opt" )
+			fi ;;
+		--exec)
+			if [ ${#tokens[@]} -eq 0 ]; then
+				exec_mode=true
+			else
+				tokens=( "${tokens[@]}" "$opt" )
+			fi ;;
+		--prefix)
+			if [ ${#tokens[@]} -eq 0 ]; then
+				get_prefix=true
+			else
+				tokens=( "${tokens[@]}" "$opt" )
+			fi ;;
 		*)
-			echo -n "$opt "
+			tokens=( "${tokens[@]}" "$opt" )
 	esac
 done
-echo
 
+if $exec_mode; then
+	exec "${tokens[@]}"
+fi
+
+echo "${tokens[@]}"
 exit 0
+