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#!/bin/sh
# let user choose a language from installed mo files for app
# was implemented in welcome1stboot.bac
# but as shell script here now
# L18L March 2014 GPL
#

version=0.1

die() { echo $1; exit 1;}

usage()
{
 echo "
 usage: $0 textdomain [ app ]
 
 app only needed if different from textdomain
 choose a language from available textdomains
 app will be launched in chosen language
 
 -h this help 
 -v version
 " 	
}

[ $1 = '-h' ] && { usage; exit 0; }
[ $1 = '-v' ] && { echo ${0##*/} version $version; exit 0; }

textdomain=$1 && [ $textdomain ] || die "which textdomain?"
app=$2 && [ "$app" ] || app=$textdomain

# some files
all_language_names=/usr/share/i18n/lang_names
[ -f $all_language_names ] || all_language_names=lang_names
[ -f $all_language_names ] || die "missing file lang_names, exiting"
these_languages=/dev/shm/language_names
chosen_lang=/dev/shm/chosen_lang_code

# English plus all other available languages for textdomain
langs="en `find /usr/share/locale/*/LC_MESSAGES/${textdomain}.mo|cut -d'/' -f5`"
num_languages="`echo $langs | wc -w`"
echo -n '' > $these_languages
for x in $langs;do echo "`grep ^$x $all_language_names`">>$these_languages;done

# GUI ========================================================================
num_cols=2 # number of columns
[ $num_languages -gt 4 ] && num_cols=3
[ $num_languages -gt 6 ] && num_cols=4

choose_language='
<window title="'$textdomain'" icon-name="gtk-preferences" window-position="1">
<vbox space-expand="true" space-fill="true">
 <vbox spacing="10" space-expand="true" space-fill="true">
 <frame ? ? ?>
  <hbox spacing="10" homogeneous="true" space-expand="true" space-fill="true">
'
x=0
col=0
while [ $x -lt $num_languages ] ; do 
 x=$(($x + 1))
 col=$(($col + 1))
 read language_name             #ex: de:Deutsch  
 lang_code=${language_name%:*}  #ex: de
 lang_name=${language_name#*:} #ex: Deutsch
 choose_language=${choose_language}'
    <button image-position="2">
     <label>"'$lang_name'"</label>
     '"`/usr/lib/gtkdialog/xml_button-icon reboot.svg huge`"'
     <action>echo '$lang_code' > chosen_lang</action>
     <action>exit:exit</action>
    </button>'
 if [ $col -ge $num_cols ]; then
  col=0
  choose_language=${choose_language}'
   </hbox>
   <hbox spacing="10" homogeneous="true" space-expand="true" space-fill="true">'
 fi
done < $these_languages
choose_language=${choose_language}'
   </hbox>
  </frame>
 </vbox>
</vbox>
</window>'
# /GUI ========================================================================

export choose_language
eval `gtkdialog -p choose_language`
chosen_lang_code=`cat chosen_lang` 
#echo chosen_lang_code=`cat chosen_lang`   #example: "nl"

#prepend chosen_lang_code to envirinment variable LANGUAGE
#echo LANGUAGE=$LANGUAGE                   #example: "fr:de:"
[ "$LANGUAGE" ] && LANGUAGE=":${LANGUAGE}" #example: ":fr:de:"
LANGUAGE="${chosen_lang_code}${LANGUAGE}"  #example: "nl:fr:de:"
export LANGUAGE

$app & #launch application
exit 0 #end