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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 # xtrace
local context=":datetime:calendar_add:"
local vdatefmt="%Y%m%dT%H%M%S"
local d='[[:digit:]]'
local calendar newfile REPLY lastline opt text occur
local -a calendar_entries lockfiles reply occurrences
integer my_date done rstat nolock nobackup new_recurring
integer keep_my_uid
local -A reply parse_new parse_old
local -a match mbegin mend
local my_uid their_uid
autoload -Uz 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] ))
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
if [[ -n $parse_new[rptstr] ]]; then
(( new_recurring = 1 ))
if [[ $parse_new[rptstr] = CANCELLED ]]; then
(( done = 1 ))
elif [[ $addline = (#b)(*[[:space:]\#]RECURRENCE[[:space:]]##)([^[:space:]]##)([[:space:]]*|) ]]; then
# Use the updated recurrence time
strftime -s REPLY $vdatefmt ${parse_new[schedrpttime]}
addline="${match[1]}$REPLY${match[3]}"
else
# Add a recurrence time
[[ $addline = *$'\n' ]] || addline+=$'\n'
strftime -s REPLY $vdatefmt ${parse_new[schedrpttime]}
addline+=" # RECURRENCE $REPLY"
fi
fi
# $calendar doesn't necessarily exist yet.
# 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 &&
zsystem flock $calendar 2>/dev/null; then
# locked OK
:
else
calendar_lockfiles $calendar || exit 1
fi
fi
if [[ -f $calendar ]]; then
calendar_read $calendar
if [[ -n $my_uid ]]; then
# Pre-scan to events with the same UID
for line in $calendar_entries; do
calendar_parse $line || continue
parse_old=("${(@kv)reply}")
# Recurring with a UID?
if [[ $line = ${~uidpat} ]]; then
their_uid=${(U)match[1]}
if [[ $their_uid = $my_uid ]]; then
# Deal with recurrences and also some add some
# extra magic for cancellation.
# See if we have found a recurrent version
if [[ -z $parse_old[rpttime] ]]; then
# No, so assume this is a straightforward replacement
# of a non-recurring event.
# Is this a cancellation of a non-recurring event?
# Look for an OCCURRENCE in the form
# OCCURRENCE 20100513T110000 CANCELLED
# although we don't bother looking at the date/time---
# it's one-off, so this should already be unique.
if [[ $new_recurring -eq 0 && \
$parse_new[text1] = (|*[[:space:]\#])"OCCURRENCE"[[:space:]]##([^[:space:]]##[[:space:]]##CANCELLED)(|[[:space:]]*) ]]; then
# Yes, so skip both the old and new events.
(( done = 1 ))
fi
# We'll skip this UID when we encounter it again.
continue
fi
if (( new_recurring )); then
# Replacing a recurrence; there can be only one.
# TBD: do we replace existing occurrences of the
# replaced recurrent event? I'm guessing not, but
# if we keep the UID then maybe we should.
#
# TBD: ick, suppose we're cancelling an even that
# we added to a recurring sequence but didn't replace
# the recurrence. We might get RPT CANCELLED for this.
# That would be bad. Should invent better way of
# cancelling non-recurring event.
continue
else
# The recorded event is recurring, but the new one is a
# one-off event. If there are embedded OCCURRENCE declarations,
# use those.
#
# TBD: We could be clever about text associated
# with the occurrence. Copying the entire text
# of the meeting seems like overkill but people often
# add specific remarks about why this occurrence was
# moved/cancelled.
#
# TBD: one case we don't yet handle is cancelling
# something that isn't replacing a recurrence, i.e.
# something we added as OCCURRENCE XXXXXXXXTXXXXXX <when>.
# If we're adding a CANCELLED occurrence we should
# look to see if it matches <when> and if so simply
# delete that occurrence.
#
# TBD: one nasty case is if the new occurrence
# occurs before the current scheduled time. As we
# never look backwards we'll miss it.
text=$addline
occurrences=()
while [[ $text = (#b)(|*[[:space:]\#])"OCCURRENCE"[[:space:]]##([^[:space:]]##[[:space:]]##[^[:space:]]##)(|[[:space:]]*) ]]; do
occurrences+=($match[2])
text="$match[1] $match[3]"
done
if (( ! ${#occurrences} )); then
# No embedded occurrences. We'll manufacture one
# that doesn't refer to an original recurrence.
strftime -s REPLY $vdatefmt $my_date
occurrences=("XXXXXXXXTXXXXXX $REPLY")
fi
# Add these occurrences, checking if they replace
# an existing one.
for occur in ${(o)occurrences}; do
REPLY=${occur%%[[:space:]]*}
# Only update occurrences that refer to genuine
# recurrences.
if [[ $REPLY = [[:digit:]](#c8)T[[:digit:]](#c6) && $line = (#b)(|*[[:space:]\#])(OCCURRENCE[[:space:]]##)${REPLY}[[:space:]]##[^[:space:]]##(|[[:space:]]*) ]]; then
# Yes, update in situ
line="${match[1]}${match[2]}$occur${match[3]}"
else
# No, append.
[[ $line = *$'\n' ]] || line+=$'\n'
line+=" # OCCURRENCE $occur"
fi
done
# The line we're adding now corresponds to the
# original event. We'll skip the matching UID
# in the file below, however.
addline=$line
# We need to work out which event is next, so
# reparse.
if calendar_parse $addline; then
parse_new=("${(@kv)reply}")
(( my_date = ${parse_new[time]} ))
if zstyle -t $context reformat-date; then
zstyle -s $context date-format datefmt
strftime -s REPLY $datefmt $parse_new[time]
addline="$REPLY $parse_new[text1]"
fi
fi
fi
fi
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
# We've already merged any information on the same UID
# with our new text, probably.
if [[ $keep_my_uid -eq 0 && -n $my_uid && $line = ${~uidpat} ]]; then
their_uid=${(U)match[1]}
[[ $my_uid = $their_uid ]] && continue
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
(( done )) || print -r -- $addline >$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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