version number

.gitignore

@@ -1 +1,2 @@
 hd
+version.rs

Makefile

@@ -7,9 +7,11 @@ install: $(OBJS)
 	install hd $(DESTDIR)$(PREFIX)/bin/
 uninstall:
 	$(RM) $(DESTDIR)$(PREFIX)/hd
-hd: main.rs
-	rustc $^ -o $@
+hd: main.rs hdinfo.rs version.rs
+	rustc $< -o $@
 	@strip $@
+version.rs:
+	printf "pub const VERSION:&str=\"$(shell git describe --abbrev=0 --tags)\";\n" > $@
 %:%.rs
 	rustc $^ -o $@
 	@strip $@

main.rs

@@ -1,3 +1,4 @@
+mod version;
 mod hdinfo;
 
 fn main()
@@ -6,7 +7,8 @@ fn main()
     let mut files:Vec<String>=vec!();
     let mut curarg=1;
     let mut h:hdinfo::Hdinfo=hdinfo::Hdinfo::new();
-    let helpmsg=format!("usage: {} [-abh] [-n OFFSET] [-r RADIX] [-w WIDTH] [--help] FILES\n\
+    let helpmsg=format!("hd v{}\n\
+                         usage: {} [-abh] [-n OFFSET] [-r RADIX] [-w WIDTH] [--help] FILES\n\
                          -a          Don't display ASCII dump\n\
                          -b          Don't display binary file offset\n\
                          -h, --help  Display this help\n\
@@ -15,6 +17,7 @@ fn main()
                          -w WIDTH    Number of columns for output\n\n\
                          SIZE        An unsigned integer or a percentage (e.g., 50%)\n\
                          RADIX       One of: 8, 10, 16",
+                         version::VERSION,
                         argv[0]);
 
     // Parse each file