Include git commit hash in version number

When operating in git repo, build system will include abbreviated git hash in
imv version number.  If there is no git repo around (eg. building from tarball),
fall back to version number in Makefile.

Fixes #90

1 files changed, 5 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 88880a8..bb75ed8 100644
--- a/Makefile
+++ b/Makefile
@@ -21,9 +21,12 @@ OBJECTS := $(patsubst src/%.c,$(BUILDDIR)/%.o,$(SOURCES))
 TESTS := $(patsubst test/%.c,$(BUILDDIR)/test_%,$(wildcard test/*.c))
 TFLAGS ?= -g ${CFLAGS}
 
-VERSION = "v2.0.0"
+VERSION := $(shell git describe --abbrev=8 --dirty --always --tags 2> /dev/null)
+ifeq ($(VERSION),)
+VERSION := 2.0.0
+endif
 
-CFLAGS += -DIMV_VERSION=\"$(VERSION)\"
+CFLAGS += -DIMV_VERSION=\""$(VERSION)"\"
 
 imv: $(TARGET)