[gimp-help] build: add support for (un)installing quickreference pdf files

[Jacob Boerema <jboerema src gnome org>]

commit 23654568993bd339d6d2415761fbe5e22b14738f
Author: Jacob Boerema <jgboerema gmail com>
Date:   Tue Mar 8 17:52:07 2022 -0500

    build: add support for (un)installing quickreference pdf files
    
    (cherry picked from commit ffbe7f9cec87d8183829b69c31ff1f0b6e6ed1f3)

 quickreference/Makefile.am | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
---
diff --git a/quickreference/Makefile.am b/quickreference/Makefile.am
index 105974401..4493ae3d6 100644
--- a/quickreference/Makefile.am
+++ b/quickreference/Makefile.am
@@ -7,6 +7,8 @@ POT_FILES = $(srcdir)/po/gimp-keys.pot
 
 PO_FILES = $(foreach lang,$(filter-out en,$(QUICKREFERENCE_ALL_LINGUAS)),$(srcdir)/po/$(lang).po)
 
+PDF_FILES = $(foreach lang,$(QUICKREFERENCE_LINGUAS),gimp-keys-$(lang).pdf)
+
 XSL_FILES = \
        stylesheets/keys-svg.xsl        \
        stylesheets/keys-docbook.xsl
@@ -25,6 +27,9 @@ EXTRA_DIST = \
 
 COMPENDIUM = Compendium.po
 
+# gimp-help directories
+helpdir  = $(gimpdatadir)/help
+
 $(srcdir)/po/gimp-keys.pot: $(srcdir)/gimp-keys.xml
        @echo Making $@; \
        $(XML2PO) $(XML2POFLAGS) $< | $(MSGUNIQ) --width=$(MSGWIDTH) - > $@
@@ -89,6 +94,26 @@ docbook: $(foreach lang,$(QUICKREFERENCE_LINGUAS),docbook/gimp-keys-$(lang).xml)
 
 all-local: svg pdf-local docbook
 
+install-data-local:
+       @$(MKDIR_P) $(DESTDIR)$(helpdir)/pdf || exit 77
+       @echo "*** Installing Quickreference PDF's into: $(DESTDIR)$(helpdir)/pdf"
+       @cd pdf; \
+       for file in $(PDF_FILES); do \
+               cp -f $${file} $(DESTDIR)$(helpdir)/pdf/$* ; \
+       done; \
+       echo .
+
+uninstall-local:
+       @test -d $(DESTDIR)$(helpdir)/pdf || exit 70
+       @echo "*** Uninstalling PDF:"
+       @for file in $(PDF_FILES); do \
+               rm -rf $(DESTDIR)$(helpdir)/pdf/$${file}; \
+       done; \
+       echo .
+       @test -z "$(DESTDIR)" || cd $(DESTDIR) && \
+       rmdir $(helpdir)/pdf \
+       && echo "Removed $(DESTDIR)${helpdir}/pdf"
+
 clean-local:
        @echo "*** Cleaning up ..."
        @rm -rf docbook