#!/bin/bash
# doc/tool/pandoc - pandoc document converter tool

set -e

lib_load 'doc/tool/latex'


######
# Native Dependencies

doc_tool_pandoc_client_packages=( pandoc )


######
# Library Configuration

doc_tool_pandoc_config_init() {

	lib_setting_vars pandoc_verbose
	pandoc_verbose=${pandoc_verbose:-false}

	lib_setting_vars --null pandoc_color_style

	lib_setting_vars --null pandoc_input_format pandoc_output_format

	lib_setting_vars --null pandoc_output_file
}


######
# Internal API

pandoc_run() {
	local -a opts
	! $pandoc_verbose || opts+=( --verbose )

	[ -z "$pandoc_color_style" ] \
		|| opts+=( --highlight-style "$pandoc_color_style" )

	[ -z "$pandoc_input_format" ] \
		|| opts+=( --read "$pandoc_input_format" )
	[ -z "$pandoc_output_format" ] \
		|| opts+=( --write "$pandoc_output_format" )

	[ -z "$pandoc_output_file" ] \
		|| opts+=( --output "$pandoc_output_file" )

	run pandoc "${opts[@]}" "$@"
}

######
# Document Format Support

pandoc_input_formats() { pandoc_run --list-input-formats; }
pandoc_output_formats() { pandoc_run --list-output-formats; }

pandoc_color_langs() { pandoc_run --list-highlight-languages; }
pandoc_color_styles() { pandoc_run --list-highlight-styles; }


######
# Document Conversion

pandoc_convert_file() {
	has_args 2 "$@"
	local pandoc_output_file=$2
	pandoc_run "$1"
}

######
# Document Conversion CLI

pandoc_dispatch() { lib_cmd_dispatch pandoc "$@"; }
pandoc_usage() {
	cat <<USAGE
...
Pandoc Commands:
	show ...			Display supported pandoc features
	convert ...			Converts documents
USAGE
}
pandoc_show() { cmd_dispatch "$@"; }
pandoc_show_usage() {
	cat <<USAGE
...
Pandoc Query Commands:
	styles				Prints highlight syles
	languages			Prints highlightable languages
	readers				Prints supported input formats
	writers				Prints supported output formats
USAGE
}

pandoc_convert() { cmd_dispatch "$@"; }
pandoc_convert_usage() {
	cat <<USAGE
...
Pandoc Conversion Commands:
	file <src> <dst>		Convert a single document
USAGE
}