#!/bin/bash
# Generate HTML header
#
# Copyright (C) 2019 Mike Gerwitz
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
#
# The header is mostly static but contains a dynamic page type and title.
##
set -euo pipefail
declare -ri EX_USAGE=64
# Generate header by populating @PAGE_{TITLE,TYPE}@. If no title is given,
# then the title will be completely omitted. If provided, it will have an
# em dash delimiter appended, with whitespace on both sides for visual
# clarity (contrary to my usual typographical conventions).
main()
{
local -r type=${1?Missing type}
local -r title_orig=${2:-}
local -r title=${title_orig/&/\\&}
[[ $type =~ ^[a-z]+$ ]] || {
echo 'error: type must be an all-lowercase word'
exit $EX_USAGE
}
[[ ! $title =~ \# ]] || {
echo "error: title must not contain \`#'"
exit $EX_USAGE
}
sed "s#@PAGE_TITLE@#$title${title:+ \\— }#g
s#@PAGE_TYPE@#$type#g
/