#!/bin/bash
#
# Author: Runa Sandvik, <runa.sandvik@gmail.com>
# Google Summer of Code 2009
#
# This is Free Software (GPLv3)
# http://www.gnu.org/licenses/gpl-3.0.txt
#
# This script will convert all of the english wml files to pot files and
# keep them updated.
#
# For more information, see the HOWTO and README in
# translation/tools/gsoc09.
# 

### start config ###

# Location of the wml files
wmldir="$PWD"

# Location of the pot files.
# Assuming that the translation directory is relative to the website
podir="`dirname $wmldir`/translation/projects/website/templates"

# Set the copyright holder of the pot files,
# for example "The Tor Project, Inc"
copyright="The Tor Project, Inc"

# A lot of the wml files have custom tags. These tags have been defined
# in website/include/versions.wmi. Tags that people usually forget to close,
# as well as tags that are not defined in versions.wmi have been added.
# See: https://svn.torproject.org/svn/website/trunk/include/versions.wmi
customtag=`echo $(cat "$wmldir/include/versions.wmi" | awk '{ printf "<%s> " , $2 }' | sed 's/<>//g') "<svnsandbox> <svnwebsite> <input> <hr> <br> <img>"`

# We also need to use the nodefault option of po4a; space separated list
# of tags that the module should not try to set by default in any
# category. For now, we only need the input tag.
nodefault='<input>'

# The script can write the name of unprocessed files to a log.
# If you want to enable this option, set the logfile here.
logfile=""

# This is the temp logfile. Leave this line even if you don't want to
# log. This will be deleted when the script is done.
tmplog="`dirname $wmldir`/tmp.log"

### end config ###

# Create a lockfile to make sure that only one instance of the script
# can run at any time.
LOCKFILE=wml2po.lock

if lockfile -! -l 60 -r 3 "$LOCKFILE"; 
then
	echo "unable to acquire lock" >2
	exit 1
fi

trap "rm -f '$PWD/$LOCKFILE'" exit

# Check if translation/projects/website exist, i.e. has been checked out
if [ ! -d $podir ]
then
	echo "Have you remembered to check out translation/projects/website?"
	exit 1
fi

# If the logfile is set, write the date.
if [ $logfile ]
then
	echo `date` > $logfile
fi

# Create the temp log
touch $tmplog

# cd to the right directory so we can commit the files later
cd "$podir"

# We only need the english wml files, but we do not wish to translate
# the eff documents.
wml=`find $wmldir -regex '^'$wmldir'/.*en/.*\.wml' -type f | grep -v '^'$wmldir'/eff'`

# For every wml, update po
for file in $wml ; do

	# Get the basename of the file we are dealing with
	wmlfile=`basename $file`

	# Get the translation priority
	priority=`cat $file | grep "# Translation-Priority" | awk '{print $3}'`

	# If the file doesn't have a translation-priority, we can assume
	# that it doesn't need to be translated. Skip this file and
	# continue on with the next.
	if [ ! $priority ]
	then
		continue
	fi

	# Strip the file for its original extension and add .pot
	pofile="$priority.${wmlfile%%.*}.pot"

	# Find out what directory the file is in.
	# Also, remove the parth of the path that is $wmldir
	indir=`dirname $file`
	
	# We need to know what one dir up is
	onedirup=`dirname $indir | sed "s#$wmldir/##"`

	# We need to have the correct, full path to the pot
	# directory for the file we are working on.
	# Also, did the subdirectory exist prior to running this
	# script? If not, create it now and add it to the
	# repository.
	if [ $onedirup = $wmldir ]
	then
		popath="$podir"
	else
		popath="$podir/$onedirup"

		# Check if the directory exists. If it doesn't,
		# create it
		if [ ! -d "$podir/$onedirup" ]
		then
			svn mkdir "$podir/$onedirup"
		fi
	fi
		
	# Check to see if the pot file existed prior to running this
	# script. If it didn't, check if there any files with the same
	# filename, but different priority. If neither of the files
	# exist, create with po4a-gettextize.
	if [ -e "$popath/$pofile" ]
	then
		poexist=1
	elif [ `find $popath -type f -name "*.$filename" | wc -l` -gt "0" ]
	then
		poexist=2

		# We need to rename the other file
		for file in `find $popath -type f -name "*.$filename"` ; do
			svn mv "$file" "$popath/$pofile"
			echo "$popath/$pofile" > $tmplog
		done
	else
		poexist=0
	fi

	# If the pot file does not exist, convert it with
	# po4a-gettextize, set the right encoding and charset
	# and the correct copyright.
	if [ $poexist = 0 ]
	then
		# Convert it
		po4a-gettextize -f wml -m "$file" -p "$popath/$pofile" --master-charset utf-8 -o customtag="$customtag" -o nodefault="$nodefault"

		# Check to see if the file exists
		if [ -e "$popath/$pofile" ]
		then
			# We don't want files without
			# content, so check the file first.
			content=`cat "$popath/$pofile" | grep '^#[.]' | wc -l`

			# If the file does not have any
			# content, delete it.
			if [ $content = 0 ] 
			then
				rm -f "$popath/$pofile"
				echo "$popath/$pofile" > $tmplog
			else
				# Set the right encoding and charset, as well
				# as the correct copyright holder.
				sed -i '0,/ENCODING/ s/ENCODING/8bit/' "$popath/$pofile"
				sed -i '0,/CHARSET/ s/CHARSET/utf-8/' "$popath/$pofile"
				sed -i "0,/Free Software Foundation, Inc/ s/Free Software Foundation, Inc/$copyright/" "$popath/$pofile"

				# And add it to the repository
				svn add "$popath/$pofile"
				echo "$popath/$pofile" > $tmplog
			fi
		fi
	fi
		
	# If the pot file does exist, calculate the hash first,
	# then update the file, then calculate the hash again.
	if [ $poexist = 1 ]
	then
		# Calculate the hash before we update the file
		before=`grep -vE '^("POT-Creation-Date:|#)' "$popath/$pofile" | md5sum | cut -d " " -f1`

		# Update the pot file
		po4a-updatepo -f wml -m "$file" -p "$popath/$pofile" --master-charset utf-8 -o customtag="$customtag" -o nodefault="$nodefault"

		# Calculate the new hash
		after=`grep -vE '^("POT-Creation-Date:|#)' "$popath/$pofile" | md5sum | cut -d " " -f1`

		# Delete the backup
		rm -f "$popath/$pofile~"

		# Now we need to compare the before and after
		# hash. If they match (i.e. nothing has
		# changed), revert the file.
		if [ $before = $after ]
		then
			svn revert "$popath/$pofile"
			echo "$popath/$pofile" > $tmplog
		else
			echo "$popath/$pofile" > $tmplog
		fi
	fi

	# If a file with the same name but different priority
	# exist, then rename the file (we have done so already)
	# and update it with po4a-updatepo to make sure
	# everything else is ok.
	if [ $poexist = 2 ]
	then
		# Update the file
		po4a-updatepo -f wml -m "$file" -p "$popath/$pofile" --master-charset utf-8 -o customtag="$customtag" -o nodefault="$nodefault"
	fi
	
	# Write to the logfile
	if [ -e $logfile ]
	then
		if [ `cat $tmplog | grep "$popath/$pofile" | wc -l` -eq "0" ]
		then
			echo "could not process: " "$file" >> $logfile
		fi
	fi

	# Delete the temp log
	rm -f $tmplog
done

	# If you want the script to commit the files automatically,
	# uncomment the following line.
	# svn ci -m 'automatically generated and updated the pot files'