share/mk/: build-book, build-man, install-man: Specify version and date

Each page has its own date.

Add new 'build-man' target, which stamps the date and version in the
pages (in $builddir, not the source ones).

Build-system internal stuff:
	$CURDIR will be used for the build system, while $srcdir will be
	used for the project root of the repository.  This helps use
	this build system in other projects.

Signed-off-by: Alejandro Colomar <alx@kernel.org>

5 files changed, 43 insertions, 10 deletions

diff --git a/GNUmakefile b/GNUmakefile
index 9e869c0381..740121cee5 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -13,8 +13,7 @@ MAKEFLAGS += --warn-undefined-variables
 
 
 srcdir      := .
-DATAROOTDIR := $(srcdir)/share
-MAKEFILEDIR := $(DATAROOTDIR)/mk
+MAKEFILEDIR := $(CURDIR)/share/mk
 
 
 INFO_ :=
@@ -28,7 +27,7 @@ all: build;
 
 
 MK_ := $(wildcard $(addprefix $(MAKEFILEDIR)/, *.mk */*.mk */*/*.mk */*/*/*.mk))
-MK  := $(srcdir)/GNUmakefile $(MK_)
+MK  := $(CURDIR)/GNUmakefile $(MK_)
 include $(MK_)
 $(MK):: ;
 
diff --git a/share/mk/build/book.mk b/share/mk/build/book.mk
index 49a5f39a1e..baf70d8e46 100644
--- a/share/mk/build/book.mk
+++ b/share/mk/build/book.mk
@@ -7,6 +7,7 @@ MAKEFILE_BUILD_BOOK_INCLUDED := 1
 
 
 include $(MAKEFILEDIR)/build/_.mk
+include $(MAKEFILEDIR)/build/man.mk
 include $(MAKEFILEDIR)/configure/build-depends/coreutils/cat.mk
 include $(MAKEFILEDIR)/configure/build-depends/groff/gropdf.mk
 include $(MAKEFILEDIR)/configure/build-depends/groff-base/eqn.mk
@@ -15,18 +16,20 @@ include $(MAKEFILEDIR)/configure/build-depends/groff-base/preconv.mk
 include $(MAKEFILEDIR)/configure/build-depends/groff-base/tbl.mk
 include $(MAKEFILEDIR)/configure/build-depends/groff-base/troff.mk
 include $(MAKEFILEDIR)/configure/build-depends/moreutils/sponge.mk
-include $(MAKEFILEDIR)/configure/src.mk
+include $(MAKEFILEDIR)/configure/version.mk
 include $(MAKEFILEDIR)/src.mk
 
 
-LMBDIR   := $(srcdir)/scripts/LinuxManBook
+LMBDIR   := $(CURDIR)/scripts/LinuxManBook
 BUILDLMB := $(LMBDIR)/build.sh
 
 
-_LMB     := $(_MANDIR)/man-pages.pdf
+LMB      := $(DISTNAME).pdf
+_LMBDIR  := $(builddir)
+_LMB     := $(_LMBDIR)/$(LMB)
 
 
-$(_LMB): $(MANPAGES) $(wildcard $(LMBDIR)/* $(LMBDIR)/*/*) | $$(@D)/
+$(_LMB): $(_MANPAGES) $(wildcard $(LMBDIR)/* $(LMBDIR)/*/*) | $$(@D)/
 	$(info	$(INFO_)Build		$@)
 	CAT='$(CAT)' \
 	PRECONV='$(PRECONV)' \
@@ -35,7 +38,7 @@ $(_LMB): $(MANPAGES) $(wildcard $(LMBDIR)/* $(LMBDIR)/*/*) | $$(@D)/
 	EQN='$(EQN)' \
 	TROFF='$(TROFF)' \
 	GROPDF='$(GROPDF)' \
-	$(BUILDLMB) $(MANDIR) \
+	$(BUILDLMB) $(_MANDIR) \
 	| $(SPONGE) $@
 
 
diff --git a/share/mk/build/man.mk b/share/mk/build/man.mk
new file mode 100644
index 0000000000..ec96a20079
--- /dev/null
+++ b/share/mk/build/man.mk
@@ -0,0 +1,31 @@
+# Copyright 2021-2024, Alejandro Colomar <alx@kernel.org>
+# SPDX-License-Identifier: LGPL-3.0-only WITH LGPL-3.0-linking-exception
+
+
+ifndef MAKEFILE_BUILD_MAN_MAN_INCLUDED
+MAKEFILE_BUILD_MAN_MAN_INCLUDED := 1
+
+
+include $(MAKEFILEDIR)/configure/build-depends/git/git.mk
+include $(MAKEFILEDIR)/configure/build-depends/sed/sed.mk
+include $(MAKEFILEDIR)/configure/src.mk
+include $(MAKEFILEDIR)/configure/verbose.mk
+include $(MAKEFILEDIR)/configure/version.mk
+include $(MAKEFILEDIR)/src.mk
+
+
+_MANPAGES := $(patsubst $(MANDIR)/%,$(_MANDIR)/%,$(MANPAGES))
+
+
+$(_MANPAGES): $(_MANDIR)/%: $(MANDIR)/% $(MK) | $$(@D)/
+	$(info	$(INFO_)SED		$@)
+	<$< \
+	$(SED) "/^.TH/s/(date)/$$($(GIT) log --format=%cs -1 -- $< $(HIDE_ERR))/" \
+	| $(SED) '/^.TH/s/(unreleased)/$(DISTVERSION)/' >$@
+
+
+.PHONY: build-man
+build-man: $(_MANPAGES)
+
+
+endif  # include guard
diff --git a/share/mk/install/man.mk b/share/mk/install/man.mk
index 8f1f3fc707..05e5bf43a5 100644
--- a/share/mk/install/man.mk
+++ b/share/mk/install/man.mk
@@ -48,7 +48,7 @@ $(foreach s, $(MANSECTIONS),                                                  \
 $(foreach s, $(MANSECTIONS),                                                  \
 	$(eval $(_man$(s)pages) $(_man$(s)intropage):                         \
 		$(_man$(s)dir)/%$(man$(s)ext)$(Z):                            \
-			$(MAN$(s)DIR)/%.$(s) $(MK) | $$$$(@D)/))
+			$(_MANDIR)/man$(s)/%.$(s) $(MK) | $$$$(@D)/))
 
 
 $(_manpages):
diff --git a/share/mk/src.mk b/share/mk/src.mk
index 36b9e8cec3..fecf2f1fc3 100644
--- a/share/mk/src.mk
+++ b/share/mk/src.mk
@@ -13,7 +13,7 @@ include $(MAKEFILEDIR)/configure/build-depends/sed/sed.mk
 include $(MAKEFILEDIR)/configure/src.mk
 
 
-SORTMAN := $(srcdir)/scripts/sortman
+SORTMAN := $(CURDIR)/scripts/sortman
 
 
 MANEXT := \(\.[[:digit:]]\([[:alpha:]][[:alnum:]]*\)\?\>\|\.man\)\+\(\.man\|\.in\)*$