libmakepkg: install pkg-config file

Since makepkg exports a public library of functions, other projects may
wish to use these functions. Highlights include parseopts or our
messaging functions.

Install a pkg-config file in order to let downstream users detect where
they can source the libmakepkg functionality. This is useful e.g. to
gracefully handle the case where a thirdparty project is configured and
installed into a different datarootdir from pacman, but still wants to
use the installed pacman's version of libmakepkg.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/.gitignore

@@ -1,3 +1,4 @@
+libmakepkg.pc
 makepkg
 makepkg-template
 pacman-db-upgrade

scripts/Makefile.am

@@ -5,6 +5,9 @@ AM_INSTALLCHECK_STD_OPTIONS_EXEMPT = \
 
 SUBDIRS = po
 
+pkgconfigdir = $(datarootdir)/pkgconfig
+pkgconfig_DATA = libmakepkg.pc
+
 bin_SCRIPTS = \
 	$(OURSCRIPTS) \
 	makepkg-template \
@@ -19,6 +22,7 @@ OURSCRIPTS = \
 	repo-add
 
 EXTRA_DIST = \
+	libmakepkg.pc.in \
 	makepkg.sh.in \
 	makepkg-template.pl.in \
 	pacman-db-upgrade.sh.in \
@@ -145,7 +149,7 @@ COMPLETION_DIST = \
 	$(addsuffix .in, $(COMPLETION_IN))
 
 # Files that should be removed, but which Automake does not know.
-MOSTLYCLEANFILES = $(bin_SCRIPTS) $(LIBMAKEPKG_IN) $(COMPLETION_IN)
+MOSTLYCLEANFILES = $(bin_SCRIPTS) $(LIBMAKEPKG_IN) $(COMPLETION_IN) libmakepkg.pc
 
 clean-local:
 	$(AM_V_at)$(RM) -r .lib
@@ -195,7 +199,7 @@ $(LIBMAKEPKG_IN): %: %.in Makefile
 	$(AM_V_at)chmod a-w $@
 	@$(BASH_SHELL) -O extglob -n $@
 
-$(COMPLETION_IN): %: %.in Makefile
+$(COMPLETION_IN) libmakepkg.pc: %: %.in Makefile
 	$(AM_V_at)$(RM) $@
 	$(AM_V_at)$(MKDIR_P) $(dir $@)
 	$(AM_V_GEN)$(edit) $(srcdir)/$@.in >$@

scripts/libmakepkg.pc.in

@@ -0,0 +1,6 @@
+libmakepkgdir=@libmakepkgdir@
+
+Name: libmakepkg
+Description: Arch Linux package build utility
+URL: https://www.archlinux.org/pacman/
+Version: @PACKAGE_VERSION@

scripts/meson.build

@@ -78,6 +78,12 @@ endforeach
 
 subdir('libmakepkg')
 
+configure_file(
+	configuration : { 'libmakepkgdir': LIBMAKEPKGDIR, 'PACKAGE_VERSION': PACKAGE_VERSION },
+	input : 'libmakepkg.pc.in',
+	output : '@BASENAME@',
+	install_dir : join_paths(DATAROOTDIR, 'pkgconfig'))
+
 custom_target(
   'bash_completion',
   command : [ SCRIPT_EDITOR, '@INPUT@', '@OUTPUT@' ],