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#!/bin/bash
# Generate HTML from txt2tags (.t2t) and Markdown (.md)
# Usage:
# - update_html
# Look for all .t2t and .md files in the current directory and below,
# generating the output HTML when the source is newer than the HTML.
# - update_html path/to/file.t2t path/to/another.md
# Generate HTML for the specified file(s), ignoring modification time.
#
# Requires:
# - txt2tags for .t2t files. Tested with 2.6.
# - pandoc for both .t2t and .md files. Tested with 1.16.0.2 and 2.3.1.
# - the template file `template.html` in the same directory as this script.
#
# Tested with Ubuntu 16.04 and macOS Mojave.
#
# See also clean_html for removing the files generated by this script.
# Path to directory where this script is
# https://stackoverflow.com/a/246128/98600
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
# HTML template
template="$DIR/template.html"
# Render txt2tags into html file
# Arguments:
# 1. txt2tags source file, e.g. download/index.t2t
# 2. html target file, e.g. download/index.html
function render_t2t_html {
t2t="$1"
html="$2"
tmp="$2.tmp"
relroot="$( dirname $t2t | sed -E 's/^.\///' | sed -E 's/[^/]+/../g' )"
# First render with txt2tags to handle pre/post processing
txt2tags \
--target=html \
--no-headers \
--quiet \
--outfile="$tmp" \
--infile="$t2t"
# Replace <A NAME="toc3"></A> with <div id="toc3"></div> so that Pandoc retains it
# Do this for both cases since BSD sed doesn't support /i
sed -i.bak "s/<a name=\"\(.*\)\"><\/a>/<div id=\"\1\"><\/div>/" "$tmp"
sed -i.bak "s/<A NAME=\"\(.*\)\"><\/A>/<div id=\"\1\"><\/div>/" "$tmp"
rm -f "$tmp.bak"
# Capture first 3 lines of t2t file: title, author, date
# Documentation here: https://txt2tags.org/userguide/headerarea
l1=$(head -n 1 "$t2t")
l2=$(tail -n+2 "$t2t" | head -n 1)
l3=$(tail -n+3 "$t2t" | head -n 1)
title=
author=
date=
if [ -n "$l1" ] ; then
title="$l1"
if [ -n "$l2" ] ; then author="$l2" ; fi
if [ -n "$l3" ] ; then date="$l3" ; fi
fi
# Run txt2tag's HTML through Pandoc for cleanup
pandoc \
--from=html \
--to=html5 \
--standalone \
--template="$template" \
--variable="lang:en" \
--variable="rel-root:$relroot" \
--metadata="title:$title" \
--metadata="author:$author" \
--metadata="date:$date" \
"$tmp" \
--output="$html"
rm -f "$tmp"
# Final post-processing
if [ -f "$html" ] ; then
sed -i.bak "s/<table/<table class=\"table\"/" "$html" && rm "$html.bak"
echo "$html"
fi
}
# Render markdown into html file
# Arguments:
# 1. markdown source file, e.g. download/index.md
# 2. html target file, e.g. download/index.html
function render_md_html {
md="$1"
html="$2"
relroot="$( dirname $md | sed -E 's/^.\///' | sed -E 's/[^/]+/../g' )"
# Look for `show-toc: true` in metadata (first ten lines of file)
if head -n 10 "$md" | grep --quiet 'show-toc: true' ; then
tocflag='--table-of-contents'
else
tocflag=''
fi
pandoc \
--from=markdown \
--to=html5 \
--standalone \
$tocflag \
--template="$template" \
--variable="lang:en" \
--variable="rel-root:$relroot" \
"$md" \
--output="$html"
# Final post-processing
if [ -f "$html" ] ; then
# add "table" class to tables
sed -i.bak "s/<table/<table class=\"table\"/" "$html"
# rewrite anchors that Pandoc 1.16 ignores: [content]{#anchor} -> <span id="anchor">content</span>
sed -i.bak -E "s/\[(.*)\]\{#(.+)\}/<span id=\"\2\">\1<\/span>/" "$html"
rm -f "$html.bak"
echo "$html"
fi
}
# Main entry point
# Script can be run in one of two modes:
if [ $# -gt 0 ] ; then
# Render specific file(s) from args, ignoring dates
for file in "$@" ; do
ext="${file##*.}"
html="${file%.$ext}.html"
case $ext in
"md")
render_md_html "$file" "$html"
;;
"t2t")
render_t2t_html "$file" "$html"
;;
esac
done
else
# Render all files found in cwd and deeper if source is newer
find . -name '*.t2t' | while read file ; do
html="${file%.t2t}.html"
if [ "$file" -nt "$html" ] || [ "$template" -nt "$html" ] ; then
render_t2t_html "$file" "$html"
fi
done
find . -name '*.md' | while read file ; do
if [[ "$file" == *"README.md" ]] || [[ "$file" == *"RELEASE.md" ]] ; then continue ; fi
html="${file%.md}.html"
if [ "$file" -nt "$html" ] || [ "$template" -nt "$html" ] ; then
render_md_html "$file" "$html"
fi
done
fi
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