From 4d57d98d263a1c685c38fdb9b0af82078612ffd9 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Mon, 16 May 2022 07:23:21 -0700
Subject: Version 1 is released.

---
 Makefile | 17 ++++++++++++++---
 pw.1     |  2 +-
 pw.c     |  5 +++--
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index a00ae4c..2050b94 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,18 @@
+PW_SHA256 := 6675178bf43216cf302d4291269b51dc87eb87235e798c4e3e30b742e458d828
 NEEDED_CFLAGS := -std=c99 -D_POSIX_C_SOURCE=200112L -D__EXTENSIONS__
+ifeq ($(shell sha256sum pw.c),$(PW_SHA256)  pw.c)
+PW_VERSION := 1
+else
+PW_VERSION := 1-$(shell git rev-parse --short HEAD)
+PW_VERSION := $(PW_VERSION)$(shell git diff --quiet || printf -- "-dirty")
+endif
 CFLAGS ?= -g -O2 -W -Wall
-override CFLAGS += $(NEEDED_CFLAGS)
+override CFLAGS += $(NEEDED_CFLAGS) -DCONFIG_PW_VER=\"$(PW_VERSION)\"
 DESTDIR ?= /usr/local
+.PHONY: all pw.1
+all: pw pw.1
 pw:
-clean: ; rm -f pw
-install: ; install pw $(DESTDIR)/bin/pw
+clean:; rm -f pw
+install:; install pw $(DESTDIR)/bin/pw; install pw.1 $(DESTDIR)/share/man/man1
+pw.1:;	@sed -e '/^\.TH/s/Version [^"]\+/Version $(PW_VERSION)/' pw.1 > pw.tmp
+	cmp -s pw.1 pw.tmp && rm pw.tmp || mv pw.tmp pw.1
diff --git a/pw.1 b/pw.1
index 23e50d3..3f05bdc 100644
--- a/pw.1
+++ b/pw.1
@@ -24,7 +24,7 @@
 .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
-.TH PW 1 "26 April 2022" "Utility Commands" "Pipe Watch"
+.TH PW 1 "16 May 2022" "Version 1" "Pipe Watch"
 
 .SH NAME
 pw \- Pipe Watch: monitor recent lines of output from pipe
diff --git a/pw.c b/pw.c
index c8b3944..9b7f860 100644
--- a/pw.c
+++ b/pw.c
@@ -299,7 +299,8 @@ static char *getln(FILE *stream)
 static void usage(void)
 {
   fprintf(stderr,
-          "\nUsage: <command> | %s [options]\n\n"
+          "\nThis is pw version %s.\n\n"
+          "Usage: <command> | %s [options]\n\n"
           "-i realnum      poll interval (s)\n"
           "-l realnum      long update interval (s)\n"
           "-n integer      display size (# of lines)\n"
@@ -317,7 +318,7 @@ static void usage(void)
           "Standard input must be redirected; it cannot be the same device\n"
           "as the controlling tty (/dev/tty) of the terminal session.\n\n"
           "For a full description, see the manual page.\n\n",
-          pw_name, pw_name);
+          CONFIG_PW_VER, pw_name, pw_name);
   exit(EXIT_FAILURE);
 }
 
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