#! /usr/bin/make -f

SAVED_PATH := $(PATH)
PWD        := $(shell pwd)

ifeq ($(MSYSTEM),MINGW32)
# Under MinGW, the NIM doc compiler wants absolute pathname arguments
# looking like C:\\MinGW\\msys\\1.0\\home ...
DOC_ROOT   := `pwd -W|sed 's|/|\\\\\\\\|g'`
else
DOC_ROOT   := $(PWD)
endif

# Collect document names
SFX_FILTER := sed -e 's|^\./||;/\/\./d;/^docs\//d;s/\.[a-z]*$$//'
PNG_FILES  := $(shell find -L .        -name '*.png' -print|$(SFX_FILTER))
MD_FILES   := $(shell find -L .        -name '*.md'  -print|$(SFX_FILTER))
EXE_FILES  := $(shell find -L .        -name '*.nim' -print|$(SFX_FILTER))
TXE_FILES  := $(shell find -L ../tests -name '*.nim' -print|$(SFX_FILTER))

# Needed for the NIM compiler that comes with this repo
NIMBLE_DIR := $(dir $(PWD))/vendor/.nimble
NIM_PATH   := $(dir $(PWD))/vendor/nimbus-build-system/vendor/Nim/bin

# Support for verbosity: V=1, V=2 etc.
ifneq ($(if $V,$V,0),0)
MUFFLE     :=
else
MUFFLE     := 2>/dev/null
endif

# Support for external NIM compiler unless X=0
ifneq ($(if $X,$X,0),0)
PATH       := $(SAVED_PATH):$(NIM_PATH):$(NIMBLE_DIR)/bin
else
PATH       := $(NIM_PATH):$(NIMBLE_DIR)/bin:$(SAVED_PATH)
endif

# Compat version is used with external NIM compiler
# NIM_COMPAT := --useVersion:1.2

# Name of NIMDOC compiler, test for newer version on host OS
NIM_CMD    := nim
NIM_TEST   := $(NIM_CMD) $(NIM_COMPAT) --help >/dev/null 2>&1
NIM_SELECT := $(NIM_TEST) && echo "$(NIM_CMD) $(NIM_COMPAT)"|| echo "$(NIM_CMD)"
# Note that the back ticks are needed in the following assignment
NIM_EXE    := `$(NIM_SELECT)`

# Extra nimdoc flags
NIMDOC_FLAGS := --verbosity:0 --hints:off --warnings:off
NIMDOC_FLAGS += -d:debug -d:disable_libbacktrace
NIMDOC_FLAGS += $(NIMFLAGS)

# Nim check flags
NIMCHK_FLAGS := c -r --verbosity:0 --hints:off --warnings:off

# Markdown compiler (test for discount tool with tables support)
MD_CMD     := markdown
MD_TEST    := $(MD_CMD) -VV 2>/dev/null|grep -q TABLES

# Default target
default: help

# ------------------------------------------------------------------------------
# Help page
# ------------------------------------------------------------------------------

.SILENT: help
help::
	echo "Usage: $(MAKE) <target> [<option> ..]"
	echo
	echo "<option>: V=1          -- verbose mode"
	echo "          X=1          -- preferring local nim compiler (this repo)"
	echo "          NIMFLAGS=..  -- additional flags for nim-docs generator"
	echo
	echo "<target>: docs         -- build NIM docs"
	echo "          docs-update  -- process missing doc pages"
	echo "          docs-index   -- index collected docs"
	echo
	echo "          check_vm     -- run \"nim c -r ..\" on each native VM source file"
	echo
	echo "          clean        -- clean up generated and backup files (not docs)"
	echo "          clean-exe    -- clean up generated executables"
	echo "          clean-docs   -- clean up generated docs and extra files"
	echo
	echo "          distclean    -- purge unnecessary stuff including docs"
	echo "          clobber      -- same as distclean"
	echo

# ------------------------------------------------------------------------------
# Build indexed docs
# ------------------------------------------------------------------------------

# Automatic rule for updating single html/idx file
docs/%.html : %.nim
#	use compat option if it works with the nim compiler
	@mkdir -p docs
	@nim=$(NIM_EXE); doc_root="$(DOC_ROOT)"; \
	export NIMBLE_DIR=$(NIMBLE_DIR); \
	(set -x; $$nim doc --outdir:docs --docRoot:"$$doc_root" --index:on \
		--errorMax:0 $(NIMDOC_FLAGS) \
		"$<" $(MUFFLE)) || true

# Automatic rule for updating markdown files
docs/ex/%.html : %.md
	@mkdir -p $(dir $@)
	@if $(MD_TEST); then \
	  (set -x; $(MD_CMD) "$<"); \
	else \
	  (echo "<pre>";(set -x;cat "$<");echo "</pre>"); \
	fi > "$@"

# Automatic rule for collecting raw files
docs/ex/%.png : %.png
	@mkdir -p $(dir $@)
	@set -x; cp "$<" "$@"

.PHONY: docs-index-helper
.SILENT: docs-index-helper
docs-index-helper:
	nim=$(NIM_EXE); \
	$$nim --version | sed q ; set -x ;\
	$$nim --skipProjCfg buildIndex -o:docs/theindex.html \
		--verbosity:0 --hints:off --warnings:off docs

.PHONY: docs-update-helper
.SILENT: docs-update-helper
docs-update-helper::
	$(NIM_EXE) --version | sed q

docs-update-helper:: $(foreach f,$(EXE_FILES),docs/$f.html)

# Kludge: some docs would only compile with the local NIM compiler
ifneq ($(X),0)
docs-update-helper::
	$(MAKE) docs-update-helper X=0 V=$(V)
endif


.PHONY: docs-extra-helper
.SILENT: docs-extra-helper
docs-extra-helper::
	$(MD_TEST) || ( \
	  echo ;\
	  echo "*** Discount markdown command with table processing is unavailable." ;\
	  echo "    On Debian/Ubuntu it is installed via \"apt install discount\".";\
	  echo "    So \"make\" is going to fall back to text file wrapping which can" ;\
	  echo "    be changed by passing \"MD_TEST=true\" to the \"make\" command line." ;\
	  echo ;\
	)

docs-extra-helper:: $(foreach f,$(MD_FILES),docs/ex/$f.html)
docs-extra-helper:: $(foreach f,$(PNG_FILES),docs/ex/$f.png)


.PHONY:  docs-update
.SILENT: docs-update
docs-update:: docs-update-helper
docs-update:: docs-extra-helper

.PHONY:  docs-index
.SILENT: docs-index
docs-index:: docs-index-helper

.PHONY:  docs
.SILENT: docs
docs:: docs-update
docs:: docs-index

# ------------------------------------------------------------------------------
# Run local compilation by source file
# ------------------------------------------------------------------------------

check_vm:
	@vmexe=`echo $(EXE_FILES)|tr ' ' '\n'|sed '/vm2\//!d'`;\
	 nim=$(NIM_EXE); \
	 export NIMBLE_DIR=$(NIMBLE_DIR); \
	 $$nim --version | sed q; \
	 for path in `echo "$$vmexe"`; do ( \
	   dir=`dirname "$$path"`; \
	   src=`basename "$$path"`; \
	   cd "$$dir" ; \
	   (set -x;$$nim $(NIMCHK_FLAGS) "$$src.nim" $(MUFFLE)) || \
	      echo "*** FAIL $$path"; \
	); done || true

# ------------------------------------------------------------------------------
# Clean up etc.
# ------------------------------------------------------------------------------

.PHONY: clobber distclean clean clean-exe clean-docs

.SILENT: clean-exe clean-test-exe
clean-exe:
	for f in $(EXE_FILES); do \
	  if   [ -f "$$f"     ]; then (set -x; rm -f "$$f"); \
	  elif [ -f "$$f.out" ]; then (set -x; rm -f "$$f.out"); \
	  fi ; \
	done

clean-test-exe:
	for f in $(TXE_FILES); do \
	  if   [ -f "$$f"     ]; then (set -x; rm -f "$$f"); \
	  elif [ -f "$$f.out" ]; then (set -x; rm -f "$$f.out"); \
	  fi ; \
	done

.SILENT: clean-docs
clean-docs:
	for f in $(foreach f,$(EXE_FILES),docs/$f) \
	         $(foreach f,$(PNG_FILES),docs/ex/$f) \
	         $(foreach f,$(MD_FILES),docs/ex/$f) \
		 docs/theindex; \
	do \
	  [ ! -f "$$f.html" ] || (set -x; rm -f "$$f.html"); \
	  [ ! -f "$$f.idx"  ] || (set -x; rm -f "$$f.idx"); \
	  [ ! -f "$$f.png"  ] || (set -x; rm -f "$$f.png"); \
	done
	for d in $(shell find docs -depth -type d -print $(MUFFLE)); do \
	  (set -x; rmdir "$$d" $(MUFFLE)) || true; \
	done

.SILENT: clean-bakfiles clean-test-bakfiles
clean-bakfiles:
	for f in $(shell find . -type f \
		\( -name '*~' -o -name '*.bak' \) -print); do \
	  (set -x; rm -f "$$f"); \
	done

clean-test-bakfiles:
	for f in $(shell find . -type f \
		\( -name '*~' -o -name '*.bak' \) -print); do \
	  (set -x; rm -f "$$f"); \
	done

.SILENT: clean-nimcache clean-test-nimcache
clean-nimcache:
#       |while.. is like "|xargs -rn1 rm -rf" but with nicer log message
	find . -name 'nimcache' -type d -print 2>/dev/null | \
	  while read d; do (set -x; rm -rf "$$d"); done

clean-test-nimcache:
	find ../tests -name 'nimcache' -type d -print 2>/dev/null | \
	  while read d; do (set -x; rm -rf "$$d"); done

clean:: clean-exe      clean-test-exe
clean:: clean-bakfiles clean-test-bakfiles
clean:: clean-nimcache clean-test-nimcache

distclean:: clean
distclean:: clean-docs

clobber:: distclean

# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------