evolve: improve error messages when conflicts occur This patch improves the error messages when conflicts occur. First, we drop the line 'evolution failed', that is not the best line we can show and evolution didn't failed, it's just interrupted by the conflicts and when user will run `hg evolve --continue`, things will be fine. I still remember when I first saw 'evolution failed', I got a bit scare as am I in a recoverable position or not. So let's drop this scary line. Second, we replace the error messages to say `resolve conflicts and see help-topic`. The help topic was added recently and documents all the three flags very well. Addition of tests also showed that all the three flags works fine with all the three instability type. So we should advertise them more. Third, we now raise the error with our error message rather than raising MergeFailure and having evolution related text in hint or stderr above. This increase the focus on the error message we want to show. After this patch, I think error messages by evolve in case of conflicts will be same in every case.

#!/usr/bin/make -f
#export DH_VERBOSE=1

%:
	dh $@ --with python2 --buildsystem=python_distutils

override_dh_auto_build:
	dh_auto_build
	$(MAKE) -C docs

hgsrc_defined:
	# Use "! -z" instead of "-n", because "-n" without arguments is true
	test ! -z $(HGSRC) && test -d $(HGSRC) || (echo "$(HGSRC) is not a directory"; false)

ifeq (,$(filter nocheck, $(DEB_BUILD_OPTIONS)))
override_dh_auto_test: hgsrc_defined
	cd tests && python $(HGSRC)/tests/run-tests.py --with-hg=$(HGSRC)/hg --blacklist=$(CURDIR)/debian/test-blacklist
endif

override_dh_python2:
	# avoid conflict with mercurial's own hgext3rd/__init__.py
	find debian -path '*/hgext3rd/__init__.py' -delete
	dh_python2

override_dh_auto_clean: clean-docs
	dh_auto_clean
	rm -f tests/*.err

clean-docs:
	rm -rf html
	rm -f docs/static/logo-evolve.ico
	rm -f docs/tutorials/tutorial.rst
	rm -f docs/tutorials/topic-tutorial.rst