#!/bin/bash

# Replace the language picker site-wide, using a common source file:
# "lang-picker-source". The script is called from the root of enc-live.
# It doesn't take an argument.

set -e
set -o pipefail

head=$(mktemp -t rt.XXXXXX)   || exit 1
picker=$(mktemp -t rt.XXXXXX) || exit 1
tail=$(mktemp -t rt.XXXXXX)   || exit 1
trap 'rm -f "$head" "$picker" "$tail"' EXIT

# List all HTML files with a language picker and take them one by one.
# The regex will select index and workshops.
find . -regex "\./.*/[iw][no][dr].*\.html" -not -path "./missing/*" |
sort | sed 's,^\./,,' | while read f; do
  # Extract the language from the file name.
  lang=${f%%/*}
  # Make sure the page is correctly formatted.
  if grep -q '<ul id="languages" class="os">' $f &&
  grep -q '<li><strong><a href=.*Translation_Guide">' $f; then
    # Add the 'current' class to the relevant item of lang-picker-source.
    sed "s,<li><a href=\"/$lang\">,<li><a class=\"current\" href=\"/$lang\">," \
      lang-picker-source > $picker
    # Extract what's before the language picker...
    sed -n '1,/<ul id="languages" class="os">/p' $f > $head
    # and what follows it.
    sed -n '/<li><strong><a href=.*Translation_Guide">/,$p' $f > $tail
    # Assemble.
    cat $head $picker $tail > $f
  else
    echo "  !!! Unable to replace the language picker in $f."
    exit 1
  fi
done

# Commit the changes.
git add */index.html */workshops.html
git commit -m "index & workshops: update the language picker."