# Copyright (C) 2015  Luke Shumaker
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Configure how Make works
MAKEFLAGS += --no-builtin-rules --no-builtin-variables
.SECONDARY:
.DELETE_ON_ERROR:

.PHONY: FORCE

ifeq ($(wildcard $(devtoolsdir)/),)
$(error config.mk:devtoolsdir points to a non-existant directory: $(devtoolsdir))
endif

write-ifchanged = $(topsrcdir)/write-ifchanged

# Magic for tracking variables that affect files.  If a file changes
# based on a variable, just stick $(var)VARNAME as a dependency.
var = $(call _am_path,$(topoutdir)/.var.)
$(var)%: FORCE
	@printf '%s' '$($*)' | $(write-ifchanged) $@

# Usage: <INPUT $(edit) >OUTPUT
# Expand m4_include macros to use librelib
# This is used when using sources grabbed from devtools
# Magic for doing @variable@ replacement in files
edit = sed \
	-e 's|^\#!\s*/bin/bash|\#!/usr/bin/env bash|' \
	-e 's|m4_include(lib/\(.*\))|. "$$(librelib \1)"|' \
	$(foreach v,$(patsubst $(var)%,%,$(filter $(var)%,$^)), -e 's|@$(v)@|$($(v))|g' )

# Usage: $(call indent,FILENAME)
# Command to auto-indent a file.
indent = emacs --batch $1 \
	--eval '(setq make-backup-files nil)' \
	--eval '(setq sh-basic-offset 8)' \
	--eval '(indent-region (point-min) (point-max) nil)' \
	-f save-buffer &>/dev/null

# Usage <INPUT $(pofmt) >OUTPUT
# Normalize a .po(t) file
pofmt = msguniq -Fi --to-code=UTF-8

# It's easy to think of these as "each" variables, but because they
# will be evaluated on demand, only am_src_files needs to be "each".
detect-all  = $(filter-out $(detect-ignore)     ,$(srcfiles))
detect-exec = $(filter-out $(detect-ignore-exec),$(patsubst $(srcdir)/%,%,$(shell find $(addprefix $(srcdir)/,$(detect-all)) -executable)))
detect-conf = $(filter-out $(detect-ignore-conf),$(filter %.conf     ,$(detect-all)))
detect-ronn = $(filter-out $(detect-ignore-ronn),$(filter %.ronn     ,$(detect-all)))
detect-md   = $(filter-out $(detect-ignore-md)  ,$(filter %.ronn %.md,$(detect-all)))
detect-sh   = $(filter-out $(detect-ignore-sh)  ,$(filter %.sh       ,$(detect-all)))

ifeq ($(wildcard $(topsrcdir)/.git),)
include $(topsrcdir)/.srcversion-libretools.mk
else
$(topsrcdir)/.srcversion-libretools.mk: FORCE
	@{ \
		echo LIBRETOOLS_VERSION = $(patsubst v%,%,$(shell cd $(topsrcdir) && git describe --tags)); \
		echo LIBRETOOLS_COMMIT = $(shell cd $(topsrcdir) && git rev-parse HEAD); \
	:; } | $(write-ifchanged) $@
-include $(topsrcdir)/.srcversion-libretools.mk
endif

ifeq ($(wildcard $(devtoolsdir)/.git),)
include $(topsrcdir)/.srcversion-devtools.mk
else
$(topsrcdir)/.srcversion-devtools.mk: FORCE
	@{ \
		echo DEVTOOLS_VERSION = $(patsubst libretools-%,%,$(shell cd $(devtoolsdir) && git describe --tags)); \
		echo DEVTOOLS_COMMIT = $(shell cd $(devtoolsdir) && git rev-parse HEAD); \
	:; } | $(write-ifchanged) $@
-include $(topsrcdir)/.srcversion-devtools.mk
endif