#!/usr/bin/env bash
## Create an index.html file with links to files in the same directory and any
## subdirectories.
##
## Usage: mkindex [<options>] [<dir>]
##
## Options:
## -c <file> CSS file
## -f <file> Footer file
## -h <file> Header file
## -t <title> Page title
## -y Skip confirmation prompt
##
## Dependencies: GNU coreutils, GNU sed
set -euo pipefail
shopt -s inherit_errexit dotglob globstar nullglob
die() { echo "$(basename "$0"): $1" >&2; exit 1; }
[[ " $* " =~ ' --help ' ]] && sed -n 's/^## \?//p' "$0" && exit
while getopts c:f:h:t:y opt; do
case $opt in
c) [[ -f $OPTARG ]] || die "CSS file not found: $OPTARG"
css_file=$OPTARG ;;
f) [[ -f $OPTARG ]] || die "footer file not found: $OPTARG"
footer=$(< "$OPTARG") ;;
h) [[ -f $OPTARG ]] || die "header file not found: $OPTARG"
header=$(< "$OPTARG") ;;
t) title=$OPTARG ;;
y) assume_yes=true ;;
*) exit 1 ;;
esac
done
shift "$(( OPTIND - 1 ))"
dir=${1:-.}; [[ -d $dir ]] || die "directory not found: $dir"
index=$dir/index.html
title=${title:-$(realpath "$dir")}
[[ -v css_file ]] &&
css_link="<link rel=stylesheet href='$(realpath --relative-to="$dir" "$css_file")'>"
if [[ -e $index && ! -v assume_yes ]]; then
read -rp "$index already exists. Overwrite it? " input
[[ $input =~ ^[Yy] ]] || exit
fi
# Create table rows.
for file in "$dir"/**; do
[[ -d $file || $file == "$index" ]] && continue
date=$(date -r "$file" +%Y-%m-%d)
file=$(realpath --relative-to="$dir" "$file")
rows+="<tr><td><a href='$file'>$file</a></td><td>$date</td></tr>"
done
tee "$index" <<-EOF > /dev/null
<!doctype html>
<html lang=en>
<meta charset=utf-8>
<title>$title</title>
<meta name=viewport content="width=device-width,initial-scale=1">
${css_link:-}
${header:-}
<main id=content>
<h1>$title</h1>
<table>
<thead><tr><td>File</td><td>Last update</td></tr></thead>
<tbody>${rows:-}</tbody>
</table>
</main>
${footer:-}
</html>
EOF