#!/bin/bash

# assemble-all-pages: includes the constant parts into all the HTML
# templates in the working directory.

# The name of a page is NAME.html and the name of the template is
# NAME.t.html. The inclusion markers in the template are similar to
# SSI directives, but for the "#".

# The script is in the same directory as all the pieces. It can be
# launched by double-clicking on it provided the path to the working
# directory is set at the first line. 

# =====================================================================

wdir=~/GNU/enc/fr/kitchen

set -e
cd $wdir

# Create temporary files.
before=$(mktemp -t h2p.XXXXXX) || exit 1
after=$(mktemp -t h2p.XXXXXX) || exit 1
trap 'rm -f "$before" "$after"' EXIT

# List all the templates in the working directory.
if ! ls *.t.html > template-list ; then
  echo "There is no template in this directory." && exit 1
fi

# Process each template of the list.
while read template; do

  page=${template/.t/}
  echo $page

  # Make sure there is a blank line before the first include, otherwise
  # it will not be added properly.
  cp $template $page && sed -i '1i\\n' $page

  # List the includes.
  grep '<!-- include virtual="' $page |
  sed 's,^.*include virtual="\([^"]\+\).*$,\1,' > include-list

  # Add the listed includes and remove the marker.
  while read include; do
    sed "1,/<!-- include virtual=\"$include\"/!d" $page > $before
    sed "1,/<!-- include virtual=\"$include\"/d" $page > $after
    if [ -f "$include" ]; then
      cat $before $include $after > $page
    else
      echo "$include is missing." && exit 1
    fi
    sed -i "/<!-- include virtual=\"$include\"/d" $page
  done < include-list

  # One item in Section 2a (Troubleshooting) of index.html has to be
  # removed from mac.html and windows.html.
  if [ "$page" == "mac.html" ] || [ "$page" == "windows.html" ]; then
    sed -i '/<!-- START DELETION -->/,/<!-- END DELETION -->/d' $page
  elif [ "$page" == "index.html" ]; then
    sed -i '/DELETION -->/d' $page
  fi

  # Delete extra blank lines at the end.
  sed -i ':a /^\n*$/ {$d; N; ba}' $page

  # Move the complete page to its final location.
  mv $page ../$page

done < template-list
exit 0