#-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-#
#> content.makefile
#
#> Build
#>
#> This Makefile handles creating, building, and publishing posts for a Gemini
#> site.
#>
# The key challenge here is creating the index files.
# 1. Create a file with index entries
# 2. Extract a list of tags to file
# 3.
#
# © 2023 Andrew Stryker <axs@sdf.org>
#-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-#

#-----------------------------------------------------------------------------#
#
# Configuration
#
#-----------------------------------------------------------------------------#

# Record the name of this Makefile
self ::= $(lastword ${MAKEFILE_LIST})

# Load environment variables if needed--not the case when this is called from
# the main Makefile
ifndef ENV_LOADED

  # Assume the base directory is two levels up if not defined
  MAKO_DIR ?= ../..

  include ${MAKO_DIR}/environment.mk

endif

#$(info $(value MAKE_SECTION_VARS))

# Compute definitions for the section, working, and staging directories
$(eval ${MAKE_SECTION_VARS})

# Gather file lists
templates ::= $(wildcard *.gmi.m4)
templates_expanded ::= $(addprefix ${staging_section}/, ${templates:.gmi.m4=.gmi})

gemtext ::= $(wildcard *.gmi)
gemtext_copied ::= $(addprefix ${staging_section}/, ${gemtext})

# Create list of potential dependencies of *.gmi.m4 templates
all ::= $(notdir $(filter-out %.gmi.m4 _% %~, $(wildcard *)))

#-----------------------------------------------------------------------------#
#
# User interface
#
#> This makefile supports the following targets:
#>
#-----------------------------------------------------------------------------#

.PHONY: default build clean show help create

# Define the default target explicitly
default: create

create: #> Create a new post (default)
	@if [ -z $${EDITOR} ]; then \
		python3 create-post.py; \
		else \
		python3 create-post.py --edit; \
		fi

build: ${gemtext_copied} ${templates_expanded}
	@echo "✓ Completed processing ${section}"
	@echo


show: #> Show enironment variables with values
	@echo "Key variables defined in ${self}:"
	@echo
	@echo "Makefile list: ${MAKEFILE_LIST}"
	@echo
	@echo "Content section .............................. ${section}"
	@echo "Staging space ................................ ${staging_section}"
	@echo
	@echo "Templates found:"
	@for x in ${templates}; do echo "\t$$x"; done
	@echo
	@echo "Gemtext files found:"
	@for x in ${gemtext}; do echo "\t\t$$x"; done
	@echo

clean: #> Delete generated files
	@rm -rf ${staging_section}
	@echo "✓ Deleted ${staging_section} and everything in it"

help: #> Display this help message
	@awk -f ${AWKHELP} ${self}

#-----------------------------------------------------------------------------#
#
# File system interface
#
#-----------------------------------------------------------------------------#

${staging_section}:
	@mkdir -p $@
	@echo "\t✓ Created staging space: $@"

${templates_expanded}: ${staging_section}/%: %.m4 ${staging_section} ${FENCE} ${all}
	@m4 --include=${MAKO_DIR} $< > $@
	@echo "\t✓ Generated $@"

${gemtext_copied}: ${staging_section}/%: % ${staging_section}
	@cat $< > $@
	@echo "\t✓ Copied $@"

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