#!/bin/bash
#
# Copyright 2018 Einhard Leichtfuß
#

# All methods operate on the file "$tmp".

typeset -a langs
langs=(
	fra-deu deu-fra
	deu-eng eng-deu
	fra-eng eng-fra
	spa-eng eng-spa
	)

typeset -a vcs_langs
vcs_langs=(
	deu-eng eng-deu
	fra-eng eng-fra
	spa-eng eng-spa
	)

function init
{
	tmp_d="$(mktemp -d)"
	tmp="$tmp_d/a"
	tmp_="$tmp_d/b"
}

function cleanup
{
	rm -rf "$tmp_d"
}
trap cleanup EXIT

# $1: string to replace: extended regular expression
# $2: string to replace with: sed replacement string
function replace
{
	sed -Ei "s/${1}/${2}/g" "$tmp"
}

# Replace line by a string (possibly including newlines).
# $1 line to replace: extended regular expression
# $2 text to replace with: (newline terminated) sed replacement string
# $3 removal type: (rm-plus-one|normal)
#   `- If $2 is empty, whether to remove only that line or also the one
#      following.
function replace_line
{
	if test -n "$2"
	then
		printf '%s' "$2" > "$tmp_"

		sed -Ei "
			/${1}/ {
				r $tmp_
				d
			}
			" "$tmp"
	else
		if [[ "$3" == rm-plus-one ]]
		then
			sed -Ei "/${1}/,+1 d" "$tmp"
		else
			sed -Ei "/${1}/ d" "$tmp"
		fi
	fi
}

# $1 line to delete: extended regular expression
function delete_line
{
	sed -Ei "/${1}/ d" "$tmp"
}