#!/bin/sh
# Copyright Eddy Petri§or <eddy.petrisor @ gmail.com>, 2006
#
# In order to generate all fonts according to the language ranges, one could use
# a sequence like the one below (all_langs file is needed):
#
#for LG in `cat all_langs`
#do
#	echo "Language = $LG"
#	DSTTTFDIR=stripped ./stripbylang $LG
#done
#
# TODO list for stripbylang
# - look for the font in the place specified by the package
# done - check if the font package is installed before unpacking
# notest - add a custom suffix and do not regenerate an existing font (cyrillic for bg, ru, uk)
# notest - add support for common code ranges
# - look for the files lang2range and lang2font in some special places (?)
# done - generate stripped fonts in a certain directory, not in the current one
# - test all the changes
 

# Input files are customizable through environment variables
LANG2RANGE=lang2range
LANG2FONT=lang2font
LANGCODE=$1
[ -z "$SRCTTFDIR" ] && SRCTTFDIR='.'
[ -z "$DSTTTFDIR" ] && DSTTTFDIR='strippedfonts'


help () {
	echo " $0 <lang_code>"
	echo '    Strips the font(s) found in the third column of ./lang2font'
	echo '    of the line containing the given language code, so that'
	echo '    it(they) will contain only the ranges specified on'
	echo "    <lang_code>'s line in lang2range"
}

# strips font $1 for language $2
stripfont4lang () {
	# extract the lines which contain only the ranges for the current language
	# if no suffix is specified, use the langauge code as a suffix
	LINES=`cat $LANG2RANGE | grep -E "^lang=[^,]*:$2:[^,]*," | sed "s/:,,/:,$2,/g"`

	# make a sorted list of all the suffixes (no duplicates)
	SUFFIXES=`echo $LINES | sed "s/lang=/\nlang=/g" | cut -f2 -d ',' | sort -u`
	
	for SUFFIX in $SUFFIXES
	do
		STRIPPED_F_NAME=`echo "$1" | sed "s:^\(.*\)\.ttf$:\1_$SUFFIX.ttf:" | sed 's:^.*/\(.*\)$:\1:g'`
		[ ! -d "$DSTTTFDIR" ] && mkdir -p "$DSTTTFDIR" && echo "Created missing destination directory: $DSTTTFDIR"
		STRIPPED_F_NAME="$DSTTTFDIR/$STRIPPED_F_NAME"

		if [ -f "$STRIPPED_F_NAME" ]
		then
			echo "$STRIPPED_F_NAME was already created. Skipping..."
		else
			echo "Creating $STRIPPED_F_NAME for $2 ... starting from $1"
			RANGES=`echo "$LINES" | sed "s/lang=/\nlang=/g" | grep -E ":,$SUFFIX," | cut -f4 -d ','`
			./strip_glyphs.pe --include "$1" "$STRIPPED_F_NAME" $RANGES
		fi
	done
}

[ -z "$LANGCODE" ] && help "$0" && exit 1

## Check if the needed font package is installed
PACK=`grep -e "^$LANGCODE:.*" $LANG2FONT | cut -f2 -d ':'`
#
#INSTVER=`LANG=C apt-cache policy "$PACK" | sed s/.*Installed:\ \(.*\)/\1`
#[ "$INSTVER" = '(none)' ] && echo "$PACK font package is not installed.Quitting." && exit 1


FONTFILES=`grep -e "^$LANGCODE:.*" $LANG2FONT | cut -f3 -d ':'`

# if no font is explicitly specified, then all the fonts of the package should be stripped
if [ -z "$FONTFILES" ]
then
	echo "No special font file specified in $LANG2FONT. Will try to strip all fonts from the font package."
	[ -z $PACK ] && echo "No default package was defined for $LANGCODE! Quitting!" && exit 1

	#TODO: test if $PACK is installed
	ISINSTALLED=`dpkg --get-selections | tr -s '\t' ' ' | grep "^$PACK install$"`
	[ ! -z "$ISINSTALLED" ] && FONTFILES=`dpkg -L $PACK | grep -e "\.ttf$"`
fi

[ -z "$FONTFILES" ] && echo 'No font files nor font package was specified. There is no input font. Quitting!' && exit 1

for FONT in $FONTFILES
do
	stripfont4lang $FONT $LANGCODE
done