kuba-orlik/README.md

## README.md

      
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              README.md
            
          
    Removes all events preceeding a given year from an .ics calendar file (the kind you can find e.g. in a Radicale-based CalDAV server).
Usage:

./trim-calendar.sh Personal 2016 # removes all events starting before the year 2016 from the calendar stored in Personal.ics file


## trim-calendar.sh
#!/bin/bash

# first argument - the calendar file
# second argument - the year.

# All of the events preceeding the year will be removed from the calendar.

CALENDAR_FILE=$1
YEAR=$2

temp_dir=___temp
temp_files_digits=5

# backup the calendar just in case
cp $CALENDAR_FILE $CALENDAR_FILE.bak
cp $CALENDAR_FILE.props $CALENDAR_FILE.bak.props

# split the calendar file into separate files for each event. This script creates multiple files in the form of xx00000
total_files=`csplit -n $temp_files_digits $CALENDAR_FILE '/BEGIN:VEVENT/' {*} | wc -l`

echo "total events found: " $total_files

mkdir -p $temp_dir

# move the events to a separate temp directory
mv xx* $temp_dir

cd $temp_dir

grep -R DTSTART . | sed -s "s/\.\/\(xx[0-9]\+\).*:\([0-9]\{4\}\).*/\1 \2/g" | awk '{if($2>=2016) print $1;}' | xargs -L 1 cat > events

cat xx00000 events xx`printf "%05d" $((total_files-1))` > $CALENDAR_FILE

cd ../
rm $CALENDAR_FILE
mv $temp_dir/$CALENDAR_FILE $CALENDAR_FILE

rm -rf $temp_dir
	#!/bin/bash

	# first argument - the calendar file
	# second argument - the year.

	# All of the events preceeding the year will be removed from the calendar.

	CALENDAR_FILE=$1
	YEAR=$2

	temp_dir=___temp
	temp_files_digits=5

	# backup the calendar just in case
	cp $CALENDAR_FILE $CALENDAR_FILE.bak
	cp $CALENDAR_FILE.props $CALENDAR_FILE.bak.props

	# split the calendar file into separate files for each event. This script creates multiple files in the form of xx00000
	total_files=`csplit -n $temp_files_digits $CALENDAR_FILE '/BEGIN:VEVENT/' {*} \| wc -l`

	echo "total events found: " $total_files

	mkdir -p $temp_dir

	# move the events to a separate temp directory
	mv xx* $temp_dir

	cd $temp_dir

	grep -R DTSTART . \| sed -s "s/\.\/\(xx[0-9]\+\).:\([0-9]\{4\}\)./\1 \2/g" \| awk '{if($2>=2016) print $1;}' \| xargs -L 1 cat > events

	cat xx00000 events xx`printf "%05d" $((total_files-1))` > $CALENDAR_FILE

	cd ../
	rm $CALENDAR_FILE
	mv $temp_dir/$CALENDAR_FILE $CALENDAR_FILE

	rm -rf $temp_dir