From 4b97b30ffda91c7d0fa284e40a4f4e05f18b1f64 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Thu, 02 Aug 2012 08:01:56 -0400
Subject: Support @@DATE@@ build system macro in man pages.

---
diff --git a/TODO b/TODO
index 883fc9a..2b44f4c 100644
--- a/TODO
+++ b/TODO
@@ -12,8 +12,6 @@ For 2.0.0:
   * Finish documenting library functions.
     - Document standard output and error stream usage.
   * Document new utility interfaces.
-  * Update build system.
-    - Add a DATE macro for manual pages.
 
 Future Plans:
   * Check on file ownership and modes.
diff --git a/man/Makefile.in b/man/Makefile.in
index e68ccce..c44c67e 100644
--- a/man/Makefile.in
+++ b/man/Makefile.in
@@ -45,7 +45,17 @@ all: $(OBJS)
 
 $(OBJS):
 	@printf '  SED man/%s\n' '$@'
-	@sed '$(sed_script)' '$(srcdir)/man/$@.in' >'$@'
+	@abmon='Nul Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec '; \
+	date=$$(LC_TIME=POSIX ls -l $(srcdir)/man/$@.in | sed 's/  / /g' | \
+		cut -d ' ' -f 6-8); \
+	md="$${date% *}"; \
+	m="$$(echo $${abmon% $${md% *} *} | wc -w)"; \
+	d="$${md#* }"; \
+	[ $${m} -lt 10 ] && m="0$${m}"; \
+	[ $${d} -lt 10 ] && d="0$${d}"; \
+	y="$${date##* }"; \
+	[ "$${y%:*}" != "$${y}" ] && y=$$(date '+%Y'); \
+	sed "$(sed_script) s&@@DATE@@&$${y}-$${m}-$${d}&;" '$(srcdir)/man/$@.in' >'$@'
 
 clean:
 	@for obj in $(OBJS); do \
--
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