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#!/bin/bash
set -e
set -o pipefail

env_to_json()
{
	while read kv
	do
		set -- "${kv%%=*}" "${kv#*=}"
		jq -cn '{ ($k): $v }' --arg k "$1" --arg v "$2"
	done
}

wp_config_export_assigns()
{
	set -- "$wp_config"
	wp_config_get_assigns |
	env_to_json |
	jq -s '{filename: $fn, assigns: .}' --arg fn "$1"
}

wp_config_export_source()
{
	set -- "$wp_config"
	jq -n -s '{filename: $fn, data: $fdata}' --arg fn "$1" --rawfile fdata "$1"
}

wp_config_export_defines()
{
	set -- "$wp_config"
	wp_config_get_defines |
	env_to_json |
	jq -s '{filename: $fn, defines: .}' --arg fn "$1"
}

wp_config_export_all()
{
	(
		wp_config_export_defines "$@" &&
		wp_config_export_assigns "$@" &&
		wp_config_export_source "$@"
	) | jq -s add
}

wp_config_get_string_defines()
{
	sed -n -e 's/\r//g' \
	-e "s/^define *( *'\([^']*\)' *, *'\([^']*\)' *) *;.*$/\1=\2/p" \
	< "$wp_config"
}

wp_config_get_raw_defines()
{
	sed -n -e 's/\r//g' \
	-e "s/^define *( *'\([^']*\)' *, *\([A-Z][A-Z_ |]*\) *) *;.*$/\1=\2/p" \
	< "$wp_config"
}

wp_config_get_defines()
{
	sed -n -e 's/\r//g' \
	-e "s/^define *( *'\([^']*\)' *, *'\([^']*\)' *) *;.*$/\1=\2/p" \
	-e "s/^define *( *'\([^']*\)' *, *\([A-Z][A-Z_ |]*\) *) *;.*$/~raw~\1=\2/p" \
	< "$wp_config"
}

wp_config_get_assigns()
{
	sed -E -e 's/\r//g' -ne \
		"s/^[$]([a-zA-Z_][a-zA-Z_0-9]*) *= *'([^']*)' *; *$/\\1=\\2/p" \
		< "$wp_config"
}

find_wp_config()
{
	# If input contains a slash then it is an absolute path.
	# Otherwise it is a subdirectory or subvolume of <file:///srv>.
	case "$1" in
		*/*) ;;
		*) set -- /srv/"$1" ;;
	esac

	for wp_config in \
		"$1" \
		"$1"/public_html/wp-config.php \
		"$1"/public_html/wordpress/wp-config.php
	do
		if [ -f "$wp_config" ]
		then
			return
		fi
	done
	false
}

new_interface_to_old_interface()
{
	jq '
	{ defines: .defines | add
	, assigns: .assigns | add
	} |
	{ db_host: .defines.DB_HOST
	, db_user: .defines.DB_USER
	, db_password: .defines.DB_PASSWORD
	, db_name: .defines.DB_NAME
	, table_prefix: .assigns.table_prefix
	}'
}

find_wp_conf()
{
	local htdir="$1" conf
	for conf in \
		"$htdir"/wp-config.php \
		"$htdir"/wordpress/wp-config.php
	do
		if [ -f "$conf" ]
		then
			printf '%s\n' "$conf"
			return
		fi
	done
	false
}

find_all_wordpress_sites()
{
	local htdir
	for htdir in /srv/*/public_html
	do
		find_wp_conf "$htdir" || continue
	done
}

if [ $# = 0 ]
then
	find_all_wordpress_sites
	exit
elif [ "$*" = '--all' ]
then
	"$0" |
	while read wp_file
	do
		"$0" "$wp_file" || exit 7
	done
elif [ $# != 1 ]
then
	exit -1
fi

if ! find_wp_config "$1"
then
	echo "Error: no wp config found.  Argument: ${1@Q}" >&2
	exit 4
fi

if [ "$NEW_INTERFACE" ]
then
	wp_config_export_all
else
	wp_config_export_all | new_interface_to_old_interface
fi