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#!/usr/bin/gawk -f
# awk script for converting an iCal formatted file to a sequence of org-mode headings.
# this may not work in general but seems to work for day and timed events from Google's
# calendar, which is really all I need right now...
#
# usage:
# awk -f THISFILE < icalinputfile.ics > orgmodeentries.org
#
# Note: change org meta information generated below for author and
# email entries!
#
# Caveats:
#
# - date entries with no time specified are assumed to be local time zone;
# same remark for date entries that do have a time but do not end with Z
# e.g.: 20130101T123456 is local and will be kept as 2013-01-01 12:34
# where 20130223T123422Z is UTC and will be corrected appropriately
#
# - UTC times are changed into local times, using the time zone of the
# computer that runs the script; it would be very hard in an awk script
# to respect the time zone of a file belonging to another time zone:
# the offsets will be different as well as the switchover time(s);
# (consider a remote shell to a computer with the file's time zone)
#
# - the UTC conversion entirely relies on the built-in strftime method;
# the author is not responsible for any erroneous conversions nor the
# consequence of such conversions
#
# - does process RRULE recurring events, but ignores COUNT specifiers
#
# - does not process EXDATE to exclude date(s) from recurring events
#
# Eric S Fraga
# 20100629 - initial version
# 20100708 - added end times to timed events
# - adjust times according to time zone information
# - fixed incorrect transfer for entries with ":" embedded within the text
# - added support for multi-line summary entries (which become headlines)
# 20100709 - incorporated time zone identification
# - fixed processing of continuation lines as Google seems to
# have changed, in the last day, the number of spaces at
# the start of the line for each continuation...
# - remove backslashes used to protect commas in iCal text entries
# no further revision log after this as the file was moved into a git
# repository...
#
# Updated by: Guido Van Hoecke <guivhoATgmailDOTcom>
# Last change: 2013.05.26 14:28:33
#----------------------------------------------------------------------------------
BEGIN {
### config section
# maximum age in days for entries to be output: set this to -1 to
# get all entries or to N>0 to only get enties that start or end
# less than N days ago
max_age = -1;
# set to 1 or 0 to yes or not output a header block with TITLE,
# AUTHOR, EMAIL etc...
header = 0;
# set to 1 or 0 to yes or not output the original ical preamble as
# comment
preamble = 0;
# set to 1 to output time and summary as one line starting with
# the time (value 1) or to 0 to output the summary as first line
# and the date and time info as a second line
condense = 0;
# set to 1 or 0 to yes or not output the original ical entry as a
# comment (mostly useful for debugging purposes)
original = 0;
# google truncates long subjects with ... which is misleading in
# an org file: it gives the unfortunate impression that an
# expanded entry is still collapsed; value 1 will trim those
# ... and value 0 doesn't touch them
trimdots = 1;
# change this to your name
author = "My Name"
# and to your email address
emailaddress = "my@email.tld"
### end config section
# use a colon to separate the type of data line from the actual contents
FS = ":";
# we only need to preserve the original entry lines if either the
# preamble or original options are true
preserve = preamble || original
first = 1; # true until an event has been found
max_age_seconds = max_age*24*60*60
if (header) {
print "#+TITLE: Main Google calendar entries"
print "#+AUTHOR: ", author
print "#+EMAIL: ", emailaddress
print "#+DESCRIPTION: converted using the ical2org awk script"
print "#+CATEGORY: google"
print "#+STARTUP: hidestars"
print "#+STARTUP: overview"
print ""
}
}
# continuation lines (at least from Google) start with a space
# if the continuation is after a description or a summary, append the entry
# to the respective variable
/^[ ]/ {
if (indescription) {
entry = entry gensub("\r", "", "g", gensub("^[ ]", "", "1", $0));
} else if (insummary) {
summary = summary gensub("\r", "", "g", gensub("^[ ]", "", "1", $0))
}
if (preserve)
icalentry = icalentry "\n" $0
}
/^BEGIN:VEVENT/ {
# start of an event: initialize global velues used for each event
date = "";
entry = ""
headline = ""
icalentry = "" # the full entry for inspection
id = ""
indescription = 0;
insummary = 0
intfreq = "" # the interval and frequency for repeating org timestamps
lasttimestamp = -1;
location = ""
rrend = ""
status = ""
summary = ""
# if this is the first event, output the preamble from the iCal file
if (first) {
if(preamble) {
print "* COMMENT original iCal preamble"
print gensub("\r", "", "g", icalentry)
}
if (preserve)
icalentry = ""
first = false;
}
}
# any line that starts at the left with a non-space character is a new data field
/^[A-Z]/ {
# we do not copy DTSTAMP lines as they change every time you download
# the iCal format file which leads to a change in the converted
# org file as I output the original input. This change, which is
# really content free, makes a revision control system update the
# repository and confuses.
if (preserve)
if (! index("DTSTAMP", $1))
icalentry = icalentry "\n" $0
# this line terminates the collection of description and summary entries
indescription = 0;
insummary = 0;
}
# this type of entry represents a day entry, not timed, with date stamp YYYYMMDD
/^DTSTART;VALUE=DATE/ {
date = datestring($2);
}
/^DTEND;VALUE=DATE/ {
time2 = datestring($2, 1);
if ( issameday )
time2 = ""
}
# this represents a timed entry with date and time stamp YYYYMMDDTHHMMSS
# we ignore the seconds
/^DTSTART[:;][^V]/ {
date = datetimestring($2);
# print date;
}
# and the same for the end date;
/^DTEND[:;][^V]/ {
time2 = datetimestring($2);
if (substr(date,1,10) == substr(time2,1,10)) {
# timespan within same date, use one date with a time range
date = date "-" substr(time2, length(time2)-4)
time2 = ""
}
}
# repetition rule
/^RRULE:FREQ=(DAILY|WEEKLY|MONTHLY|YEARLY)/ {
# get the d, w, m or y value
freq = tolower(gensub(/.*FREQ=(.).*/, "\\1", "1", $0))
# get the interval, and use 1 if none specified
interval = $2 ~ /INTERVAL=/ ? gensub(/.*INTERVAL=([0-9]+);.*/, "\\1", "1", $2) : 1
# get the enddate of the rule and use "" if none specified
rrend = $2 ~ /UNTIL=/ ? datestring(gensub(/.*UNTIL=([0-9]{8}).*/, "\\1", "1", $2)) : ""
# build the repetitor vale as understood by org
intfreq = " +" interval freq
# if the repetition is daily, and there is an end date, drop the repetitor
# as that is the default
if (intfreq == " +1d" && time2 =="" && rrend != "")
intfreq = ""
}
# The description will the contents of the entry in org-mode.
# this line may be continued.
/^DESCRIPTION/ {
$1 = "";
entry = entry gensub("\r", "", "g", $0);
indescription = 1;
}
# the summary will be the org heading
/^SUMMARY/ {
$1 = "";
summary = gensub("\r", "", "g", $0);
# trim trailing dots if requested by config option
if(trimdots && summary ~ /\.\.\.$/)
sub(/\.\.\.$/, "", summary)
insummary = 1;
}
# the unique ID will be stored as a property of the entry
/^UID/ {
id = gensub("\r", "", "g", $2);
}
/^LOCATION/ {
location = gensub("\r", "", "g", $2);
}
/^STATUS/ {
status = gensub("\r", "", "g", $2);
}
# when we reach the end of the event line, we output everything we
# have collected so far, creating a top level org headline with the
# date/time stamp, unique ID property and the contents, if any
/^END:VEVENT/ {
#output event
if(max_age<0 || ( lasttimestamp>0 && systime()<lasttimestamp+max_age_seconds ) )
{
# build org timestamp
if (intfreq != "")
date = date intfreq
if (time2 != "")
date = date ">--<" time2
else if (rrend != "")
date = date ">--<" rrend
# translate \n sequences to actual newlines and unprotect commas (,)
if (condense)
print "* <" date "> " gensub("^[ ]+", "", "", gensub("\\\\,", ",", "g", gensub("\\\\n", " ", "g", summary)))
else
print "* " gensub("^[ ]+", "", "1", gensub("\\\\,", ",", "g", gensub("\\\\n", " ", "g", summary))) "\n<" date ">"
print ":PROPERTIES:"
print ":ID: " id
if(length(location))
print ":LOCATION: " location
if(length(status))
print ":STATUS: " status
print ":END:"
print ""
# translate \n sequences to actual newlines and unprotect commas (,)
if(length(entry)>1)
print gensub("^[ ]+", "", "1", gensub("\\\\,", ",", "g", gensub("\\\\n", "\n", "g", entry)));
# output original entry if requested by 'original' config option
if (original)
print "** COMMENT original iCal entry\n", gensub("\r", "", "g", icalentry)
}
}
# funtion to convert an iCal time string 'yyyymmddThhmmss[Z]' into a
# date time string as used by org, preferably including the short day
# of week: 'yyyy-mm-dd day hh:mm' or 'yyyy-mm-dd hh:mm' if we cannot
# define the day of the week
function datetimestring(input)
{
# print "________"
# print "input : " input
# convert the iCal Date+Time entry to a format that mktime can understand
spec = gensub("([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9])T([0-9][0-9])([0-9][0-9])([0-9][0-9]).*[\r]*", "\\1 \\2 \\3 \\4 \\5 \\6", "g", input);
# print "spec :" spec
stamp = mktime(spec);
lasttimestamp = stamp;
if (stamp <= 0) {
# this is a date before the start of the epoch, so we cannot
# use strftime and will deliver a 'yyyy-mm-dd hh:mm' string
# without day of week; this assumes local time, and does not
# attempt UTC offset correction
spec = gensub("([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9])T([0-9][0-9])([0-9][0-9])([0-9][0-9]).*[\r]*", "\\1-\\2-\\3 \\4:\\5", "g", input);
# print "==> spec:" spec;
return spec;
}
if (input ~ /[0-9]{8}T[0-9]{6}Z/ ) {
# this is an utc time;
# we need to correct the timestamp by the utc offset for this time
offset = strftime("%z", stamp)
pm = substr(offset,1,1) 1 # define multiplier +1 or -1
hh = substr(offset,2,2) * 3600 * pm
mm = substr(offset,4,2) * 60 * pm
# adjust the timestamp
stamp = stamp + hh + mm
}
return strftime("%Y-%m-%d %a %H:%M", stamp);
}
# function to convert an iCal date into an org date;
# the optional parameter indicates whether this is an end date;
# for single or multiple whole day events, the end date given by
# iCal is the date of the first day after the event;
# if the optional 'isenddate' parameter is non zero, this function
# tries to reduce the given date by one day
function datestring(input, isenddate)
{
#convert the iCal string to a an mktime input string
spec = gensub("([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9]).*[\r]*", "\\1 \\2 \\3 00 00 00", "g", input);
# compute the nr of seconds after or before the epoch
# dates before the epoch will have a negative timestamp
# days after the epoch will have a positive timestamp
stamp = mktime(spec);
if (isenddate) {
# subtract 1 day from the timestamp
# note that this also works for dates before the epoch
stamp = stamp - 86400;
# register whether the end date is same as the start date
issameday = lasttimestamp == stamp
}
# save timestamp to allow for check of max_age
lasttimestamp = stamp
if (stamp < 0) {
# this date is before the epoch;
# the returned datestring will not have the short day of week string
# as strftime does not handle negative times;
# we have to construct the datestring directly from the input
if (isenddate) {
# we really should return the date before the input date, but strftime
# does not work with negative timestamp values; so we can not use it
# to obtain the string representation of the corrected timestamp;
# we have to return the date specified in the iCal input and we
# add time 00:00 to clarify this
return spec = gensub("([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9]).*[\r]*", "\\1-\\2-\\3 00:00", "g", input);
} else {
# just generate the desired representation of the input date, without time;
return gensub("([0-9][0-9][0-9][0-9])([0-9][0-9])([0-9][0-9]).*[\r]*", "\\1-\\2-\\3", "g", input);
}
}
# return the date and day of week
return strftime("%Y-%m-%d %a", stamp);
}
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