From 4ab720b44ac5a98a9192d87a50630f964ab5eaa6 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Thu, 26 Nov 2015 21:43:06 -0500
Subject: build system: version.sh: initial implementation.

---
 Makefile.in        | 16 ++++++++++----
 sysinfo/version.sh | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+), 4 deletions(-)
 create mode 100755 sysinfo/version.sh

diff --git a/Makefile.in b/Makefile.in
index 6c64a0e..df3113b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -128,11 +128,11 @@ shared-implib:	shared-lib
 
 
 
-default-app:	static $(DEFAULT_APP) $(APP)
+default-app:	version.tag static $(DEFAULT_APP) $(APP)
 
-shared-app:	shared $(SHARED_APP)
+shared-app:	version.tag shared $(SHARED_APP)
 
-static-app:	static $(STATIC_APP)
+static-app:	version.tag static $(STATIC_APP)
 
 
 
@@ -172,6 +172,13 @@ host.tag:	Makefile
 		$(PROJECT_DIR)/sysinfo/host/host.sh --compiler="$(CC)" --cflags="$(CFLAGS)"
 		touch host.tag
 
+version.tag:
+		$(PROJECT_DIR)/sysinfo/version.sh	\
+			-s $(PROJECT_DIR)		\
+			-o build/$(PACKAGE)_version.h	\
+			-p $(PACKAGE)
+		touch version.tag
+
 distclean:	clean
 		rm -f Makefile
 
@@ -179,6 +186,7 @@ clean:
 		rm -f tree.tag
 		rm -f dirs.tag
 		rm -f host.tag
+		rm -f version.tag
 		rm -f $(SHARED_OBJS)
 		rm -f $(STATIC_OBJS)
 		rm -f $(APP_OBJS)
@@ -285,6 +293,6 @@ clean:
 		default-app shared-app static-app \
 		install-shared install-static install-implib \
 		install-headers install-app \
-		clean distclean \
+		clean distclean version \
 		.display-env .display-tools .display-flags \
 		.display-pe .display-elf .display-dirs .display-build
diff --git a/sysinfo/version.sh b/sysinfo/version.sh
new file mode 100755
index 0000000..fb1e8c3
--- /dev/null
+++ b/sysinfo/version.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+usage()
+{
+cat << EOF >&2
+
+Usage:
+  -h            show this HELP message
+  -s  SRCDIR    set source directory
+  -o  OUTPUT    set output header
+  -p  PREFIX    set macro prefix
+
+EOF
+exit 1
+}
+
+
+# one
+workdir=$(pwd)
+srcdir=
+output=
+prefix=
+
+
+while getopts "hs:o:p:" opt; do
+	case $opt in
+	h)
+  		usage
+  		;;
+	s)
+    		srcdir="$OPTARG"
+    		;;
+	o)
+    		output="$OPTARG"
+    		;;
+	p)
+    		prefix="$OPTARG"
+    		;;
+	\?)
+    		printf "Invalid option: -%s" "$OPTARG" >&2
+    		usage
+    		;;
+	esac
+done
+
+
+# two
+if [ -z "$srcdir" ] || [ -z "$output" ] || [ -z "$prefix" ]; then
+	usage
+fi
+
+cd "$srcdir" || exit 2
+
+gitver=`git rev-parse --verify HEAD` || gitver="unknown"
+macro=`echo "$prefix"_GIT_VERSION | tr '[:lower:]' '[:upper:]'`
+
+cd "$workdir" || exit 2
+printf "#define $macro\t\"$gitver\"\n" > "$output"
+
+# all done
+exit 0
-- 
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