#!/bin/bash
# copyright © 2008,2009 by 
# Thomas Arend ("Byggvir of Barley", http://www.byggvir.de).
# Translated to bash by David Joyner http://www.ipernity.com/user/wdj
# Requires imagemagick commands to be in your path
#
# Call this using the following syntax:
#
# calendar <year> <month> <picture> | sh
#
# where <month> is in {1, 2, ..., 12} and
# <picture> is a jpg, png, or gif file. The file
# name outputed by this script has the form ip-<picture>.
# The days of the month are superimposed on the bottom of the 
# picture.
#
##############################################################

[ $# -lt 3 ] && echo "usage $0 YEAR MONTH PICTURE" && exit 1

YEAR=${1}
MONTH=${2}
PICTURE=${3}

# Get width and height of the picture
W=`identify -format "%w" "${PICTURE}"`
H=`identify -format "%h" "${PICTURE}"`

# Define the number of days in a month
DINM=(31 28 31 30 31 30 31 31 30 31 30 31)
if [ $((YEAR % 4)) -eq 0 ];
then
  DINM[1]=29
  if [ { ${{YEAR % 100}} -eq 0 } -a { ${{YEAR % 400}} -ne 0 } ];
  then
    DINM[1]=28
  fi
fi

# Define the days of the week [English version]
# Modify the data below **and** the WDAY case below for
# other languages.
NOFD=(M T W Th F Sa Su)
NOFM=(January February March April May June July August September October November December)

PREFIX="ip"
FONT="Andy MT"
PTSIZE=$(((W>H?H:W)/40))
SIGN=" "
# Uncomment the line below for a copyright notice.
#SIGN="© 2008,2009 by XYZ" ## <-- replace "XYZ" by YOUR name here

echo -e "convert \\"
echo -e "-gravity North \\"
echo -e "-pointsize 128 -family \"$FONT\" \\"
echo -e "-fill Black -draw 'text 36,12 \"${NOFM[$((MONTH-1))]} $YEAR\"' \\"
echo -e "-fill Lightgrey -draw 'text 31,7 \"${NOFM[$((MONTH-1))]} $YEAR\"' \\"

echo -e "-gravity SouthEast \\"
echo -e "-pointsize 16 -family \"$FONT\" \\"
echo -e "-fill Black -draw 'text 32,8 \"$SIGN\"' \\"
echo -e "-fill Lightgrey -draw 'text 31,7 \"$SIGN\"' \\"


echo -e "-gravity NorthWest \\"
echo -e "-pointsize $PTSIZE -family \"$FONT\" \\"

DEFCOL1=Red
DEFCOL2=MediumVioletRed
DEFCOL3=Black
COLOR=$DEFCOL3
COLSHADOW=Lightgrey
for (( d=1 ; d <= DINM[MONTH-1] ; d++ ));
do
  X=$((W*(2*d-1)/2/(DINM[MONTH-1]+1)))
  Y=$((H-3*PTSIZE-5))
  WDAY=${NOFD[`date +%w -d "$YEAR-$MONTH-$d"`]}
  case "$WDAY" in
   Su) COLOR=$DEFCOL1 ;; # <-- Su="Sunday"
   Sa) COLOR=$DEFCOL2 ;; # <-- Sa="Saturday"
   * ) COLOR=$DEFCOL3 ;; # <-- other days of the week
  esac
  echo "-fill $COLSHADOW -draw 'text $X,$Y \"$WDAY\"' \\"
  echo "-fill $COLOR -draw " "'text $(($X-1)),$(($Y-1)) \"$WDAY\"' \\"
  Y=$((H-2*PTSIZE))
  echo "-fill $COLSHADOW -draw 'text $X,$Y \"$d\"' \\"
  echo "-fill $COLOR -draw 'text $(($X-1)),$(($Y-1)) \"$d\"' \\"
done
#echo "\"${PICTURE}\" \"${PICTURE%/*}/${PREFIX}-${PICTURE##*/}\" "

if [ ! "${PICTURE%/*}" = "${PICTURE##*/}" ];
then
	echo "\"${PICTURE}\" \"${PICTURE%/*}/${PREFIX}-${PICTURE##*/}\" "
else
	echo "\"${PICTURE}\" \"${PREFIX}-${PICTURE##*/}\" "
fi