doc/Makefile

doc/Makefile: do not create files in case of errors

When stdout is redirected to the target file directly, the file is
created as an empty file even when an error occurs. Since the file is
there, 'make' wont try to re-create it in subsequent runs.

This fix is similar to the one in a6747ba27d22, but it also takes care
of rst2html and gendoc.py.

SOURCES=$(wildcard *.[0-9].txt)
MAN=$(SOURCES:%.txt=%)
HTML=$(SOURCES:%.txt=%.html)
PREFIX=/usr/local
MANDIR=$(PREFIX)/share/man
INSTALL=install -c -m 644
PYTHON=python
RST2HTML=$(shell which rst2html 2> /dev/null || which rst2html.py)

all: man html

man: $(MAN)

html: $(HTML)

hg.1.txt: hg.1.gendoc.txt
	touch hg.1.txt

hg.1.gendoc.txt: gendoc.py ../mercurial/commands.py ../mercurial/help.py
	${PYTHON} gendoc.py > $@.tmp
	mv $@.tmp $@

%: %.txt common.txt
	$(PYTHON) rst2man.py --strip-elements-with-class htmlonly $*.txt $*

%.html: %.txt common.txt
	$(RST2HTML) $*.txt $*.html

MANIFEST: man html
# tracked files are already in the main MANIFEST
	$(RM) $@
	for i in $(MAN) $(HTML) hg.1.gendoc.txt; do \
	  echo "doc/$$i" >> $@ ; \
	done

install: man
	for i in $(MAN) ; do \
	  subdir=`echo $$i | sed -n 's/^.*\.\([0-9]\)$$/man\1/p'` ; \
	  mkdir -p $(DESTDIR)$(MANDIR)/$$subdir ; \
	  $(INSTALL) $$i $(DESTDIR)$(MANDIR)/$$subdir ; \
	done

clean:
	$(RM) $(MAN) $(MAN:%=%.html) *.[0-9].gendoc.txt MANIFEST