#
# Copyright (c) 2012, Joyent, Inc. All rights reserved.
#
# Makefile.targ: common targets.
#
# NOTE: This makefile comes from the "eng" repo. It's designed to be dropped
# into other repos as-is without requiring any modifications. If you find
# yourself changing this file, you should instead update the original copy in
# eng.git and then update your repo to use the new version.
#
# This Makefile defines several useful targets and rules. You can use it by
# including it from a Makefile that specifies some of the variables below.
#
# Targets defined in this Makefile:
#
#	check	Checks JavaScript files for lint and style
#		Checks bash scripts for syntax
#		Checks SMF manifests for validity against the SMF DTD
#
#	clean	Removes built files
#
#	docs	Builds restdown documentation in docs/
#
#	prepush	Depends on "check" and "test"
#
#	test	Does nothing (you should override this)
#
#	xref	Generates cscope (source cross-reference index)
#
# For details on what these targets are supposed to do, see the Joyent
# Engineering Guide.
#
# To make use of these targets, you'll need to set some of these variables. Any
# variables left unset will simply not be used.
#
#	BASH_FILES	Bash scripts to check for syntax
#			(paths relative to top-level Makefile)
#
#	CLEAN_FILES	Files to remove as part of the "clean" target.  Note
#			that files generated by targets in this Makefile are
#			automatically included in CLEAN_FILES.  These include
#			restdown-generated HTML and JSON files.
#
#	DOC_FILES	Restdown (documentation source) files. These are
#			assumed to be contained in "docs/", and must NOT
#			contain the "docs/" prefix.
#
#	JSL_CONF_NODE	Specify JavaScriptLint configuration files
#	JSL_CONF_WEB	(paths relative to top-level Makefile)
#
#			Node.js and Web configuration files are separate
#			because you'll usually want different global variable
#			configurations.  If no file is specified, none is given
#			to jsl, which causes it to use a default configuration,
#			which probably isn't what you want.
#
#	JSL_FILES_NODE	JavaScript files to check with Node config file.
#	JSL_FILES_WEB	JavaScript files to check with Web config file.
#
#	SMF_MANIFESTS	XML files to check for validity using the SMF DTD.
#
# You can also override these variables:
#
#	BASH		Path to bash (default: bash)
#
#	JSL		Path to JavaScriptLint (default: "jsl")
#
#	JSL_FLAGS_NODE	Additional flags to pass through to JSL
#	JSL_FLAGS_WEB
#	JSL_FLAGS
#
#	JSSTYLE		Path to jsstyle (default: jsstyle)
#
#	JSSTYLE_FLAGS	Additional flags to pass through to jsstyle
#

#
# Defaults for the various tools we use.
#
BASH		?= bash
CP		?= cp
JSL		?= jsl
JSSTYLE		?= jsstyle
MKDIR		?= mkdir -p
MV		?= mv
RESTDOWN	?= restdown
RMTREE		?= rm -rf
JSL_FLAGS  	?= --nologo --nosummary

#
# Defaults for other fixed values.
#
DOC_BUILD	= build/docs/public

#
# Configure JSL_FLAGS_{NODE,WEB} based on JSL_CONF_{NODE,WEB}.
#
ifneq ($(origin JSL_CONF_NODE), undefined)
	JSL_FLAGS_NODE += --conf=$(JSL_CONF_NODE)
endif

ifneq ($(origin JSL_CONF_WEB), undefined)
	JSL_FLAGS_WEB += --conf=$(JSL_CONF_WEB)
endif

.PHONY: check-jsl check-jsl-node check-jsl-web
check-jsl: check-jsl-node check-jsl-web

check-jsl-node: $(JSL_FILES_NODE:%=%.jslnodechk)

check-jsl-web: $(JSL_FILES_WEB:%=%.jslwebchk)

%.jslnodechk: % $(JSL_SCRIPT)
	$(JSL) $(JSL_FLAGS) $(JSL_FLAGS_NODE) $<

%.jslwebchk: % $(JSL_SCRIPT)
	$(JSL) $(JSL_FLAGS) $(JSL_FLAGS_WEB) $<

.PHONY: check-jsstyle
check-jsstyle: $(JSSTYLE_FILES:%=%.jsstylechk)

%.jsstylechk: % $(JSSTYLE_SCRIPT)
	$(JSSTYLE) $(JSSTYLE_FLAGS) $<

.PHONY: check
check: check-jsl check-jsstyle
	@echo check ok

.PHONY: clean
clean:
	-$(RMTREE) $(CLEAN_FILES)

#
# The "docs" target is complicated because we do several things here:
#
#    (1) Use restdown to build HTML and JSON files from each of DOC_FILES.
#
#    (2) Copy these files into $(DOC_BUILD) (build/docs/public), which
#        functions as a complete copy of the documentation that could be
#        mirrored or served over HTTP.
#
#    (3) Then copy any directories and media from docs/media into
#        $(DOC_BUILD)/media. This allows projects to include their own media,
#        including files that will override same-named files provided by
#        restdown.
#
# Step (3) is the surprisingly complex part: in order to do this, we need to
# identify the subdirectories in docs/media, recreate them in
# $(DOC_BUILD)/media, then do the same with the files.
#
DOC_MEDIA_DIRS := $(shell find docs/branding/media -type d | grep -v "^docs/branding/media$$")
DOC_MEDIA_DIRS := $(DOC_MEDIA_DIRS:docs/branding/media/%=%)
DOC_MEDIA_DIRS_BUILD := $(DOC_MEDIA_DIRS:%=$(DOC_BUILD)/media/%)

DOC_MEDIA_FILES := $(shell find docs/branding/media -type f)
DOC_MEDIA_FILES := $(DOC_MEDIA_FILES:docs/media/%=%)
DOC_MEDIA_FILES_BUILD := $(DOC_MEDIA_FILES:%=$(DOC_BUILD)/media/%)

#
# Like the other targets, "docs" just depends on the final files we want to
# create in $(DOC_BUILD), leveraging other targets and recipes to define how
# to get there.
#
.PHONY: docs
docs:							\
    $(DOC_FILES:%.md=$(DOC_BUILD)/%.html)		\
    $(DOC_FILES:%.md=$(DOC_BUILD)/%.json)		\
    $(DOC_MEDIA_FILES_BUILD)

#
# We keep the intermediate files so that the next build can see whether the
# files in DOC_BUILD are up to date.
#
.PRECIOUS:					\
    $(DOC_FILES:%.md=docs/%.html)		\
    $(DOC_FILES:%.md=docs/%json)

#
# We do clean those intermediate files, as well as all of DOC_BUILD.
#
CLEAN_FILES +=					\
    $(DOC_BUILD)				\
    $(DOC_FILES:%.md=docs/%.html)		\
    $(DOC_FILES:%.md=docs/%.json)

#
# Before installing the files, we must make sure the directories exist. The |
# syntax tells make that the dependency need only exist, not be up to date.
# Otherwise, it might try to rebuild spuriously because the directory itself
# appears out of date.
#
$(DOC_MEDIA_FILES_BUILD): | $(DOC_MEDIA_DIRS_BUILD)

$(DOC_BUILD)/%: docs/% | $(DOC_BUILD)
	$(CP) $< $@
	$(RM) $<

docs/%.json docs/%.html: docs/%.md | $(DOC_BUILD)
	$(RESTDOWN) -b ./docs/branding -m $(DOC_BUILD) $<

$(DOC_BUILD):
	$(MKDIR) $@

info:
	echo "DOC_MEDIA_FILES is '$(DOC_MEDIA_FILES)'"
	echo "DOC_MEDIA_FILES_BUILD is '$(DOC_MEDIA_FILES_BUILD)'"

$(DOC_MEDIA_DIRS_BUILD):
	$(MKDIR) $@

#
# The default "test" target does nothing. This should usually be overridden by
# the parent Makefile. It's included here so we can define "prepush" without
# requiring the repo to define "test".
#
.PHONY: test
test:

.PHONY: prepush
prepush: check test