#!/bin/bash

### This script finds all .t2t (txt2tags) files and updates the corresponding
### .html file, if it is out-of-date.

# Path to this directory (not CWD)
# https://stackoverflow.com/a/246128/98600
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"

function render_html {
  t2t=$1
  html=$2
  relroot="$( dirname $t2t | sed -E 's/^.\///' | sed -E 's/[^/]+/../g' )"
  pandoc \
    --from=t2t \
    --to=html5 \
    --standalone \
    --template="$DIR/_template.html" \
    --css="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" \
    --variable="rel-root:$relroot" \
    "$t2t" \
    --output="$html"
  if [ -f "$html" ] ; then
    sed -i.bak "s/<table>/<table class=\"table\">/" "$html" && rm "$html.bak"
    sed -i.bak -E "s/\`\`(.+)\`\`/<code>\1<\/code>/g" "$html" && rm "$html.bak"
    echo "$html"
  else
    echo "Error creating $html"
  fi
}

if [ $# -gt 0 ] ; then
  # Render spcific file(s) from args, ignoring dates
  for t2t in "$@" ; do
    html="${t2t%.t2t}.html"
    render_html "$t2t" "$html"
  done
else
  # Render all files found from cwd, if source is newer
  find . -name '*.t2t' | while read t2t ; do
    html="${t2t%.t2t}.html"
    if [ "$t2t" -nt "$html" ] ; then
      render_html "$t2t" "$html"
    fi
  done
fi