#!/bin/sh

# default keywords
KEYWORDS="Name GenericName Comment Keywords Description ExtraNames X-TDE-Submenu"

# parse arguments
while [ $# -gt 0 ]; do
  key="$1"
  case $key in
    -k*)
      if [ "${1#-k}" = "" ]; then
        KEYWORD="$2"
        shift
      else
        KEYWORD=${1#-k}
      fi
      if [ "$KEYWORD" = "-" ]; then
        KEYWORDS=""
      else
        KEYWORDS="$KEYWORDS $KEYWORD"
      fi
      ;;

    -o*)
      if [ "${1#-o}" = "" ]; then
        POT="$2"
        shift
      else
        POT=${1#-o}
      fi
      ;;

    *)
      [ -f "$1" ] && \
      D="${D}|$1"
      ;;
  esac
  shift
done

oldIFS=$IFS
IFS="|"
set -- ${D#|}
IFS=$oldIFS

if [ -z "$1" ]; then
  echo "No desktop file specified for processing. Exiting..."
  exit 1
fi
if [ -z "$KEYWORDS" ]; then
  echo "No keywords specified to extract. Exiting..."
  exit 1
fi

# determine path for translations
TRANSLATIONS_DIR="translations/desktop_files"
if [ -n "$(git rev-parse --git-dir 2>/dev/null)" ]; then
  TRANSLATIONS_DIR="$(git rev-parse --show-toplevel)/${TRANSLATIONS_DIR}"
  APPNAME=$(basename $(git rev-parse --show-toplevel))
fi

# determine POT name
if [ -z "$POT" ]; then
  if [ $# -gt 1 ]; then
    POT="$APPNAME-desktops"
  else
    POT="$(basename "$1")/"
  fi
fi
if [ "${POT%/}" != "${POT}" ]; then
  TRANSLATIONS_DIR="$TRANSLATIONS_DIR/${POT%/}"
  POT=${POT%/}
fi
if [ "${POT%.pot}" = "${POT}" ]; then
  POT=${POT}.pot
fi
[ -d "$TRANSLATIONS_DIR" ] || \
mkdir -p "$TRANSLATIONS_DIR"

# prepare keywords to match
KEYWORDS_MATCH="$(echo "$KEYWORDS" | sed -e "s|^ *||" -e "s| *$||" -e "s# \+#\\\\|#g" )"

# prepare desktop files for xgettext
unset DO
unset DX
while [ $# -gt 0 ]; do
  D="$1"
  shift
  DO="$DO|$D.orig"
  DX="$DX|$D.tde_l10n"

  if [ ! -f "$D.orig" ]; then
    (
     printf "[<default>]\n"
     cat "$D"
    ) > "$D.orig"
    grep -v "^[a-zA-Z][^=]*\[[a-z][^=]*\]" "$D.orig" | \
    grep -Fxv "[<default>]" > "$D"
  fi

  # xgettext for desktop files generates a reference to the source file
  # one line below the actual position and does not have the option
  # to use the variable name as a comment in the POT file.
  # That's why we have our own mechanism for extracting strings.
  sed \
    -e "s|\"|\\\\\"|g" \
    < "$D" | \
  sed \
    -e "s#^\($KEYWORDS_MATCH\)[ ]*=[ ]*\(.*\)#/*\1*/i18n(\"\2\");#;t" \
    -e "s|.*||" \
    > "$D.tde_l10n"
done

# extract strings
#xgettext --foreign-user -L Desktop -k -k"Name" -k"GenericName" -k"Comment" -k"Keywords" -k"Description" -k"ExtraNames" -k"X-TDE-Submenu" -o - "$D" | \
printf "%s" "${DX#|}" | tr "|" "\0" | xargs -r0 \
xgettext --foreign-user --from-code=UTF-8 -Cc -ki18n -o - | \
sed "s|\.tde_l10n||g" | \
sed "s|Content-Type: text/plain; charset=CHARSET|Content-Type: text/plain; charset=UTF-8|" | \
msguniq -o - \
> "$TRANSLATIONS_DIR/$POT"
POT_HEADER=$(sed -n "1,/^$/p" "$TRANSLATIONS_DIR/$POT")

# remove temporary files
printf "%s" "${DX#|}" | tr "|" "\0" | xargs -r0 \
rm

# process languages
printf "%s" "${DO#|}" | tr "|" "\0" | xargs -r0 cat |
sed -n "s|.*\[\([^]]*\)\][ ]*=.*|\1|p" | \
grep -vx "xx" | \
sort -u | \
while read L; do
  printf "%s\n" "$POT_HEADER" | sed "s|\(Language: \)|\1$L|" > "$TRANSLATIONS_DIR/$L.po"

  # process sections
  printf "%s\n" "${DO#|}" | tr "|" "\n" |
  while read D; do
    sed -n "s|^\[\(.*\)\]$|\1|p" "$D" | \
    sed -e 's|/|\\\\/|g' | \
    while read S; do
      # process variables
      sed -n "/^\[$S\]/,/^\[/s|^\([^#\[][^\[]*\)\[$L\][ ]*=.*|\1|p" "$D" | \
      while read V; do
        MSGID=$(sed -n -e "s|\"|\\\\\"|g" \
                    -e "/^\[$S\]/,/^\[/s|^$V[ ]*=[ ]*\(.*\)$|msgid \"\1\"|p" "$D")
        if [ -n "$MSGID" ] && [ -z "$(grep -Fx "$MSGID" "$TRANSLATIONS_DIR/$L.po")" ]; then
          printf "%s\n" "$MSGID"
          sed -n -e "s|\"|\\\\\"|g" -e "/^\[$S\]/,/^\[/s|^$V\[$L\][ ]*=[ ]*\(.*\)$|msgstr \"\1\"|p" "$D" | head -n1
          printf "\n"
        fi
      done >> "$TRANSLATIONS_DIR/$L.po"
    done
  done

  # update according to template
  printf "%s" "-- $L "
  msgmerge --update --backup=none "$TRANSLATIONS_DIR/$L.po" "$TRANSLATIONS_DIR/$POT"
done

# The LINGUAS file will be generated during build.
#ls "$TRANSLATIONS_DIR" | LANG=C sort | sed -n "s|\.po$||p" > "$TRANSLATIONS_DIR/LINGUAS"