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#!/bin/zsh
# All arguments are joined with spaces and inserted into the calendar
# file at the appropriate point.
#
# While the function compares the date of the new entry with dates in the
# existing calendar file, it does not do any sorting; it inserts the new
# entry before the first existing entry with a later date and time.
emulate -L zsh
setopt extendedglob
local context=":datetime:calendar_add:"
local calendar newfile REPLY lastline opt
local -a calendar_entries lockfiles reply
integer my_date done rstat nolock nobackup new_recurring old_recurring
local -A reply parse_new parse_old recurring_uids
autoload -U calendar_{parse,read,lockfiles}
while getopts "BL" opt; do
case $opt in
(B)
nobackup=1
;;
(L)
nolock=1
;;
(*)
return 1
;;
esac
done
shift $(( OPTIND - 1 ))
# Read the calendar file from the calendar-file style
zstyle -s $context calendar-file calendar ||
calendar=~/calendar
newfile=$calendar.new.$HOST.$$
local addline="$*"
if ! calendar_parse $addline; then
print "$0: failed to parse date/time" >&2
return 1
fi
parse_new=("${(@kv)reply}")
(( my_date = $parse_new[time] ))
[[ -n $parse_new[rpttime] ]] && (( new_recurring = 1 ))
if zstyle -t $context reformat-date; then
local datefmt
zstyle -s $context date-format datefmt ||
datefmt="%a %b %d %H:%M:%S %Z %Y"
strftime -s REPLY $datefmt $parse_new[time]
addline="$REPLY $parse_new[text1]"
fi
# $calendar doesn't necessarily exist yet.
local -a match mbegin mend
local my_uid their_uid
# Match a UID, a unique identifier for the entry inherited from
# text/calendar format.
local uidpat='(|*[[:space:]])UID[[:space:]]##(#b)([[:xdigit:]]##)(|[[:space:]]*)'
if [[ $addline = ${~uidpat} ]]; then
my_uid=${(U)match[1]}
fi
# start of subshell for OS file locking
(
# start of block for following always to clear up lockfiles.
# Not needed but harmless if OS file locking is used.
{
if (( ! nolock )); then
if zmodload -F zsh/system b:zsystem && zsystem supports flock; then
zsystem flock $calendar
else
calendar_lockfiles $calendar || exit 1
fi
fi
if [[ -f $calendar ]]; then
calendar_read $calendar
if [[ -n $my_uid ]]; then
# Pre-scan to find recurring events with a UID
for line in $calendar_entries; do
calendar_parse $line || continue
# Recurring with a UID?
if [[ -n $reply[rpttime] && $line = ${~uidpat} ]]; then
# Yes, so record this as a recurring event.
their_uid=${(U)match[1]}
recurring_uids[$their_uid]=$reply[time]
fi
done
fi
{
for line in $calendar_entries; do
calendar_parse $line || continue
parse_old=("${(@kv)reply}")
if (( ! done && ${parse_old[time]} > my_date )); then
print -r -- $addline
(( done = 1 ))
fi
if [[ -n $parse_old[rpttime] ]]; then
(( old_recurring = 1 ))
else
(( old_recurring = 0 ))
fi
if [[ -n $my_uid && $line = ${~uidpat} ]]; then
their_uid=${(U)match[1]}
if [[ $my_uid = $their_uid ]]; then
# Deal with recurrences, being careful in case there
# are one-off variants that don't replace recurrences.
#
# Bug 1: "calendar" still doesn't know about one-off variants.
# Bug 2: neither do I; how do we know which occurrence
# it replaces?
# Bug 3: the code for calculating recurrences is awful anyway.
if (( old_recurring && new_recurring )); then
# Replacing a recurrence; there can be only one.
continue
elif (( ! new_recurring )); then
# Not recurring. See if we have previously found
# a recurrent version
[[ -n $recurring_uids[$their_uid] ]] && (( old_recurring = 1 ))
# No, so assume this is a straightforward replacement
# of a non-recurring event.
(( ! old_recurring )) && continue
# It's recurring, but if this is a one-off at the
# same time as the previous one, replace anyway.
[[ -z $parse_old[$rpttime] ]] &&
(( ${parse_new[time]} == ${parse_old[time]} )) &&
continue
fi
fi
fi
if [[ $parse_old[time] -eq $my_date && $line = $addline ]]; then
(( done )) && continue # paranoia: shouldn't happen
(( done = 1 ))
fi
print -r -- $line
done
(( done )) || print -r -- $addline
} >$newfile
if (( ! nobackup )); then
if ! mv $calendar $calendar.old; then
print "Couldn't back up $calendar to $calendar.old.
New calendar left in $newfile." >&2
(( rstat = 1 ))
fi
fi
else
print -r -- $line >$newfile
fi
if (( !rstat )) && ! mv $newfile $calendar; then
print "Failed to rename $newfile to $calendar.
Old calendar left in $calendar.old." >&2
(( rstat = 1 ))
fi
} always {
(( ${#lockfiles} )) && rm -f $lockfiles
}
exit $rstat
)
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