#!/bin/sh
# 
# A script to find out which .po files has been updated since the last
# update, according to the PO-Revision flag and the Debian changelog
# 
# Copyright (c) 2004 Nikolai Prokoschenko (nikolai@prokoschenko.de)
#
# This script is available under the GNU Public License
# (http://www.gnu.org/licenses/gpl.txt) 

CURDIR=`dirname $0`

if [ "x$1" = "x" ]
then
  echo "Usage: $0 <package-directory>"
  exit
fi

P=$1;
PACKAGE=`echo $P | sed 's/\/$//g'` 

if [ ! -d $PACKAGE ]
then
  echo "Cannot access the directory $PACKAGE!"
  exit
fi


CHANGELOG="$PACKAGE/debian/changelog"
POS="`for i in $PACKAGE/debian/po $PACKAGE/*/po $PACKAGE/po ; do \
        if test -d $i ; then echo $i ; break ; fi ; \
      done`"
RELEASE="sid|unstable|experimental"

if [ ! -e $CHANGELOG ]
then
  echo "Cannot find the changelog file!"
  exit
fi

if [ ! -d "$POS" ]
then
  echo "Cannot find the PO directory!"
  exit
fi

# Line number of the changelog's old date
LINE=`grep -a "; urgency=" "$CHANGELOG" | egrep -n "$RELEASE" | head -n 1 | sed 's/:.*//g'`

if [ ! -z "$LINE" ]; then
	# Date of the last release
	DATE=`grep -a "^ --" "$CHANGELOG" | head -n $LINE | tail -n 1 | sed 's/.*>  //g'`
	OLD_DATE=`date -d "$DATE" +%s`
else
	OLD_DATE=0
fi

touch $PACKAGE/debian/.credits_log

for i in $POS/*.po
do
  if [ -f "$i" ]
  then
    DATE=`grep PO-Revision "$i" | cut -d ":" -f 2,3 | sed 's/^ //g' | cut -d '\\' -f 1`

    # Workaround for some weird date formatting
    if [ ! "`echo "$DATE" | sed 's/GMT+//g'`" = "$DATE" ]
    then
	DATE="`echo "$DATE" | sed 's/GMT//g'`"
    fi

    if date --date "$DATE" 2>/dev/null 1>&2 
    then
	NEW_DATE=`date -d "$DATE" +%s`
	if [ $NEW_DATE -ge $OLD_DATE ]
	then
	    
	    CSN=`basename $i | sed 's/\.po//g'`

	    # Get the translator's name

	    # [\\] needed because otherwise sed seems to treat \\n as
	    # backslash+newline?
	    translator=`grep '^"Last-Translator:' $i | sed 's/\"//g' | sed 's/Last-Translator: //g' | sed 's/<.*$//g' | sed 's/ *[\\]n$//'`
	    
	    # Convert to UTF-8 -- the changelogs should be UTF-8, the
	    # translations need not.

	    encoding=`grep "charset=" $i | sed 's/\"//g' | sed 's/^.*charset=//g' | sed 's/n//g'`
	    if [ -n "$encoding" ]; then
		    trans=`echo $translator | iconv -f $encoding -t utf-8`
	    fi	    

	    # And output the changelog line
	    
	    echo "$CSN.po:$trans" >> $PACKAGE/debian/.credits_log
	    sort $PACKAGE/debian/.credits_log | uniq > t
	    mv t $PACKAGE/debian/.credits_log
        
	fi
    fi
  fi
done