gitexecdir = ${shell git --exec-path}
gitmanpath = ${shell git --man-path}

-include ./config.mak

ifndef BASH_PATH
	BASH_PATH = /bin/bash
endif

A2X = a2x

# a2x sometimes need $XML_CATALOG_FILES to be set. If a2x fails, retry
# with XML_CATALOG_FILES set to these files, if they exist. See
# https://gitlab.com/git-latexdiff/git-latexdiff/issues/35#note_119280499
TRY_XML_CATALOG_FILES = /usr/local/etc/xml/catalog

BASH_PATH_SQ = $(subst ','\'',$(BASH_PATH))
GIT_LATEXDIFF_VERSION=${shell git describe --tags HEAD 2>/dev/null || \
			 echo unknown-version}
gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
gitmanpath_SQ = $(subst ','\'',$(gitmanpath))

SCRIPT=git-latexdiff

.PHONY: help install-bin install-doc install force
help:
	@echo 'This is the help target of the Makefile. Current configuration:'
	@echo '  gitexecdir = $(gitexecdir_SQ)'
	@echo '  gitmanpath = $(gitmanpath_SQ)'
	@echo '  BASH_PATH = $(BASH_PATH_SQ)'
	@echo '  git-latexdiff version: $(GIT_LATEXDIFF_VERSION)'
	@echo 'Run "$(MAKE) install" to install $(SCRIPT) in gitexecdir.'
	@echo 'Other available targets'
	@echo '  - make git-latexdiff.1: generate the manpage without installing'
	@echo '  - make install-bin: install only the script'
	@echo '  - make install-doc: install only the man page'

install: install-bin install-doc

install-bin:
	sed -e '1s|#!.*/bash|#!$(BASH_PATH_SQ)|' \
	    -e 's|@GIT_LATEXDIFF_VERSION@|$(GIT_LATEXDIFF_VERSION)|' \
	        $(SCRIPT) > '$(gitexecdir_SQ)/$(SCRIPT)'
	chmod 755 '$(gitexecdir_SQ)/$(SCRIPT)'

git-latexdiff.txt: git-latexdiff git-latexdiff.txt.header
	( cat git-latexdiff.txt.header ; \
	  printf '%s\n' ------------ ; \
	  ./git-latexdiff --help ; \
	  echo ; \
	  ./git-latexdiff --help-examples ; \
	  printf '%s\n' ------------ ) > $@

git-latexdiff.1: git-latexdiff.txt
# Just check for the presence of a2x before using it, to give a
# user-friendly error message.
	@command -v $(A2X) 2>&1 >/dev/null || { \
		echo; \
		echo "    ERROR: Command $(A2X) not found. The man page cannot be generated."; \
		echo "    Either install asciidoc and retry, or install latexdiff without"; \
		echo "    the man page using \"$(MAKE) install-bin."; \
		echo; \
		exit 1; \
	}
	$(A2X) --doctype manpage --format manpage $< || { \
		for f in $(TRY_XML_CATALOG_FILES); do \
			if [ -f $$f ]; then \
				echo "$(A2X) failed, retrying with XML_CATALOG_FILES=$$f" ;\
				XML_CATALOG_FILES=$$f \
				$(A2X) --doctype manpage --format manpage $< && exit 0; \
			fi ; \
		done ; \
	}

install-doc: git-latexdiff.1
	mkdir -p $(gitmanpath_SQ)/man1/
	cp $< $(gitmanpath_SQ)/man1/

dist: dist/git-latexdiff.zip
dist/git-latexdiff.zip: force
	-$(RM) -fr dist/git-latexdiff/
	mkdir -p dist/git-latexdiff/bin/ dist/git-latexdiff/man
	$(MAKE) gitexecdir=$(PWD)/dist/git-latexdiff/bin gitmanpath=$(PWD)/dist/git-latexdiff/man/ install
	(sed -ne '1,/Installation/p' README.md | head -n -1 ;\
	 echo 'The output of git-latexdiff -h is given below:' ;\
	 echo ;\
	 echo '```' ;\
	 ./git-latexdiff --help ;\
	echo '```' ;\
	echo ;\
	echo "Examples" ;\
	echo "--------" ;\
	echo ;\
	./git-latexdiff --help-examples | grep -v "^Examples:" ;\
	)> dist/git-latexdiff/README.md
	cd dist/ && zip -r git-latexdiff.zip git-latexdiff
	@echo "dist/git-latexdiff.zip generated."

force: