From d812a8a1f69288778781795171005472dd28231f Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Sat, 7 Apr 2018 11:16:40 +0200
Subject: [PATCH] Version numbers

---
 Makefile    | 24 ++++++++++++++++++------
 paperjam.cc |  9 ++++++++-
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 7552ec0..5704100 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,26 @@
+VERSION=0.1
+YEAR=2018
+BUILD_DATE:=$(shell date '+%Y-%m-%d')
+BUILD_COMMIT:=$(shell if git rev-parse >/dev/null 2>/dev/null ; then git describe --always --tags ; else echo '<unknown>' ; fi)
+
 CXXFLAGS=-O2 -Wall -Wextra -Wno-parentheses -std=gnu++11 -g
 
 all: paperjam
 
-paperjam: paperjam.o pdf-tools.o parse.o cmds.o pdf.o
+MODULES=paperjam pdf-tools parse cmds pdf
+OBJS=$(addsuffix .o, $(MODULES))
+
+paperjam: $(OBJS)
 	$(LD) -o $@ $^ $(LDLIBS)
 paperjam: LDLIBS += -lqpdf -lpaper
 paperjam: LD=$(CXX)
 
-paperjam.o: jam.h pdf-tools.h
-pdf-tools.o: jam.h pdf-tools.h
-parse.o: jam.h pdf-tools.h
-cmds.o: jam.h pdf-tools.h
-pdf.o: jam.h pdf-tools.h
+$(OBJS): jam.h pdf-tools.h
+
+paperjam.o: CXXFLAGS += -DVERSION='"$(VERSION)"' -DYEAR='"$(YEAR)"' -DBUILD_DATE='"$(BUILD_DATE)"' -DBUILD_COMMIT='"$(BUILD_COMMIT)"'
+
+clean:
+	rm -f *.o
+	rm -f paperjam
+
+.PHONY: all clean
diff --git a/paperjam.cc b/paperjam.cc
index 6419a7e..3af52ab 100644
--- a/paperjam.cc
+++ b/paperjam.cc
@@ -98,6 +98,13 @@ Commands:\n\
   parser_help();
 }
 
+static void show_version()
+{
+  printf("PaperJam " VERSION " -- a PDF processor\n");
+  printf("(c) " YEAR " Martin Mares, distributed under GNU GPL 2+\n");
+  printf("Built on " BUILD_DATE " from Git commit " BUILD_COMMIT "\n");
+}
+
 int main(int argc, char **argv)
 {
   int c;
@@ -111,7 +118,7 @@ int main(int argc, char **argv)
 	debug_level++;
 	break;
       case OPT_VERSION:
-	printf("This is paperjam with no version yet.\n");	// FIXME
+	show_version();
 	return 0;
       case OPT_HELP:
 	usage();
-- 
2.39.2