# Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.

# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

#

# This code is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License version 2 only, as

# published by the Free Software Foundation.  Oracle designates this

# particular file as subject to the "Classpath" exception as provided

# by Oracle in the LICENSE file that accompanied this code.

#

# This code 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 General Public License

# version 2 for more details (a copy is included in the LICENSE file that

# accompanied this code).

#

# You should have received a copy of the GNU General Public License version

# 2 along with this work; if not, write to the Free Software Foundation,

# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

#

# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

# or visit www.oracle.com if you need additional information or have any

# questions.

#

ifeq (,$(_MAKEBASE_GMK))

  $(error You must include MakeBase.gmk prior to including ProcessMarkdown.gmk)

endif

include TextFileProcessing.gmk

# Helper function for SetupProcessMarkdown

# $1: The $1 from SetupProcessMarkdown

# $2: The name of the current source file, relative to the dir given in $3

# $3: The directory of the current source file

define ProcessMarkdown

  $1_$2_OUTPUT_FILE := $$($1_DEST)/$$(basename $2)$$($1_FILE_EXT)

  $1_$2_TARGET_DIR := $$(dir $$($1_$2_OUTPUT_FILE))

  $1_$2_INPUT_FILE := $3/$2

  $1_$2_MARKER := $$(subst /,_,$1_$2)

  ifneq ($$($1_REPLACEMENTS), )

    $1_$2_PANDOC_INPUT := $$(SUPPORT_OUTPUTDIR)/markdown/$$($1_$2_MARKER)_pre.tmp

    $$(eval $$(call SetupTextFileProcessing, $1_$2_PREPROCESSED, \

        SOURCE_FILES := $$($1_$2_INPUT_FILE), \

        OUTPUT_FILE := $$($1_$2_PANDOC_INPUT), \

        REPLACEMENTS := $$($1_REPLACEMENTS), \

    ))

  else

    $1_$2_PANDOC_INPUT := $$($1_$2_INPUT_FILE)

  endif

  ifneq ($$($1_POST_PROCESS), )

    $1_$2_PANDOC_OUTPUT := $$(SUPPORT_OUTPUTDIR)/markdown/$$($1_$2_MARKER)_post.tmp

  else

    $1_$2_PANDOC_OUTPUT := $$($1_$2_OUTPUT_FILE)

  endif

  ifneq ($$($1_CSS), )

    ifneq ($$(findstring http:/, $$($1_CSS)), )

      $1_$2_CSS_OPTION := --css '$$($1_CSS)'

    else

      $1_$2_CSS := $$(strip $$(call RelativePath, $$($1_CSS), $$($1_$2_TARGET_DIR)))

      $1_$2_CSS_OPTION := --css '$$($1_$2_CSS)'

    endif

  endif

  # This does not need to be included in VARDEPS since it's from the actual

  # source file. Only run the shell if the recipe gets executed below.

  $1_$2_OPTIONS_FROM_SRC = \

      $$(shell $$(GREP) _pandoc-options_: $3/$2 | $$(CUT) -d : -f 2-)

  ifneq ($$($1_FILTER), )

    $1_$2_OPTIONS := --filter $$($1_FILTER)

  endif

  $1_$2_VARDEPS := $$($1_OPTIONS) $$($1_$2_OPTIONS) $$($1_CSS) \

      $$($1_REPLACEMENTS) $$($1_POST_PROCESS)

  $1_$2_VARDEPS_FILE := $$(call DependOnVariable, $1_$2_VARDEPS, \

      $$(SUPPORT_OUTPUTDIR)/markdown/$$($1_$2_MARKER).vardeps)

  $$($1_$2_PANDOC_OUTPUT): $$($1_$2_PANDOC_INPUT) $$($1_$2_VARDEPS_FILE) $$($1_EXTRA_DEPS)

	$$(call LogInfo, Converting $2 to $$($1_FORMAT))

	$$(call MakeDir, $$(SUPPORT_OUTPUTDIR)/markdown $$(dir $$($1_$2_PANDOC_OUTPUT)))

	$$(call ExecuteWithLog, $$(SUPPORT_OUTPUTDIR)/markdown/$$($1_$2_MARKER), \

	    $$(PANDOC) $$($1_OPTIONS) -f $$(PANDOC_MARKDOWN_FLAG) \

	    -t $$($1_FORMAT) --standalone \

	    $$($1_$2_CSS_OPTION) $$($1_$2_OPTIONS_FROM_SRC) $$($1_$2_OPTIONS) \

	    '$$($1_$2_PANDOC_INPUT)' -o '$$($1_$2_PANDOC_OUTPUT)')

        ifneq ($$(findstring $$(LOG_LEVEL), debug trace),)

	  TOO_LONG_LINES=`$$(GREP) -E -e '^.{80}.+$$$$' $$<` || true ; \

	  if [ "x$$$$TOO_LONG_LINES" != x ]; then \

	    $$(ECHO) "Warning: Unsuitable markdown in $$<:" ; \

	    $$(ECHO) "The following lines are longer than 80 characters:" ; \

	    $$(GREP) -E -n -e '^.{80}.+$$$$' $$< || true ; \

	  fi

        endif

  # If we have no post processing, PANDOC_OUTPUT is set to OUTPUT_FILE. Otherwise

  # PANDOC_OUTPUT is a temporary file, and we must now create the real OUTPUT_FILE.

  ifneq ($$($1_POST_PROCESS), )

    $$($1_$2_OUTPUT_FILE): $$($1_$2_PANDOC_OUTPUT)

	$$(call LogInfo, Post-processing markdown file $2)

	$$(call MakeDir, $$(SUPPORT_OUTPUTDIR)/markdown $$($1_$2_TARGET_DIR))

	$$(call ExecuteWithLog, $$(SUPPORT_OUTPUTDIR)/markdown/$$($1_$2_MARKER)_post, \

	    $$($1_POST_PROCESS) < $$($1_$2_PANDOC_OUTPUT) > $$($1_$2_OUTPUT_FILE))

  endif

  $1 += $$($1_$2_OUTPUT_FILE)

endef

################################################################################

# Setup make rules for converting a markdown file to html.

#

# Parameter 1 is the name of the rule. This name is used as variable prefix,

# and the targets generated are listed in a variable by that name.

#

# Remaining parameters are named arguments. These include:

#   DEST     : Destination root dir

#   FILES    : List of files to copy with absolute paths, or path relative to SRC.

#   SRC      : Source root dir; if given keep input files hierarchy relative to

#              SRC in DEST, otherwise flatten structure into DEST.

#   FORMAT   : The target format (defaults to html5)

#   FILE_EXT : The file extension to replace .md with (defaults to .html)

#   OPTIONS  : Additional options to pandoc

#   EXTRA_DEPS : Additional dependencies to add to each pandoc call

#   FILTER   : Optional pandoc filter command

#   POST_PROCESS : Optional command-line to post-process generated markdown

#   REPLACEMENTS : Text replacements to perform on input file before processing

#

SetupProcessMarkdown = $(NamedParamsMacroTemplate)

define SetupProcessMarkdownBody

  ifeq ($$($1_FILES), )

    $$(error FILES is missing in SetupProcessMarkdown $1)

  endif

  ifeq ($$($1_DEST), )

    $$(error DEST is missing in SetupProcessMarkdown $1)

  endif

  # If no target format is specified, default to html5.

  ifeq ($$($1_FORMAT), )

    $1_FORMAT := html5

  endif

  ifeq ($$($1_FORMAT), man)

    # If no file extension is specified, default to '.1'.

    ifeq ($$($1_FILE_EXT), )

      $1_FILE_EXT := .1

    endif

  else ifeq ($$($1_FORMAT), html5)

    ifeq ($$($1_FILE_EXT), )

      $1_FILE_EXT := .html

    endif

  else ifeq ($$($1_FORMAT), html)

    ifeq ($$($1_FILE_EXT), )

      $1_FILE_EXT := .html

    endif

  endif

  # Remove any trailing slash

  $1_DEST := $$(patsubst %/,%,$$($1_DEST))

  ifeq ($$($1_SRC), )

    # No SRC given, assume we're flattening all files into output dir.

    $$(foreach f, $$($1_FILES), \

      $$(eval $$(call ProcessMarkdown,$1,$$(notdir $$f),$$(patsubst %/,%,$$(dir $$f)))) \

    )

  else

    # Remove any trailing slash

    $1_SRC := $$(patsubst %/,%,$$($1_SRC))

    $$(foreach f, $$(patsubst $$($1_SRC)/%,%,$$($1_FILES)), \

      $$(eval $$(call ProcessMarkdown,$1,$$f,$$($1_SRC))) \

    )

  endif

endef