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	tics2txt-ics - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://hg6vgqziawt5s4dj.onion/ics2txt
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	tics2txt-ics (1697B)
	---
	1 #!/usr/bin/awk -f
	2
	3 function isleap(year)
	4 {
	5 return (year % 4 == 0) && (year % 100 != 0) \|\| (year % 400 == 0)
	6 }
	7
	8 function mdays(mon, year)
	9 {
	10 return (mon == 2) ? (28 + isleap(year)) : (30 + (mon + (mon > 7)…
	11 }
	12
	13 # Split the time in seconds since epoch into a table, with fields
	14 # named as with gmtime(3): tm["year"], tm["mon"], tm["mday"],
	15 # tm["hour"], tm["min"], tm["sec"]
	16 function gmtime(sec, tm,
	17 s)
	18 {
	19 tm["year"] = 1970
	20 while (sec >= (s = 86400 * (365 + isleap(tm["year"])))) {
	21 tm["year"]++
	22 sec -= s
	23 }
	24
	25 tm["mon"] = 1
	26 while (sec >= (s = 86400 * mdays(tm["mon"], tm["year"]))) {
	27 tm["mon"]++
	28 sec -= s
	29 }
	30
	31 tm["mday"] = 1
	32 while (sec >= (s = 86400)) {
	33 tm["mday"]++
	34 sec -= s
	35 }
	36
	37 tm["hour"] = 0
	38 while (sec >= 3600) {
	39 tm["hour"]++
	40 sec -= 3600
	41 }
	42
	43 tm["min"] = 0
	44 while (sec >= 60) {
	45 tm["min"]++
	46 sec -= 60
	47 }
	48
	49 tm["sec"] = sec
	50 }
	51
	52 function print_fold(prefix, s, n)
	53 {
	54 while (s != "") {
	55 line = substr(s, 1, n)
	56 if (length(s) > n) sub(" +[^ \t\r\n]*$", "", line)
	57 print prefix line
	58 s = substr(s, length(line) + 2)
	59 }
	60 }
	61
	62 BEGIN {
	63 print "BEGIN:VCALENDAR"
	64 print "VERSION:2.0"
	65 print "CALSCALE:GREGORIAN"
	66 print "METHOD:PUBLISH"
	67 }
	68
	69 {
	70 split($0, a, "\t")
	71 gmtime(a[1] + offset, beg)
	72 gmtime(a[2] + offset, end)
	73 cat = a[3]; loc = a[4]; sum = a[5]; des = a[6]
	74
	75 print ""
	76 print "BEGIN:VEVENT"
	77 printf "DTSTART:%04d%02d%02dT%02d%02d00Z\n",
	78 beg["year"], beg["mon"], beg["mday"], beg["hour"], beg["min"]
	79 printf "DTEND:%04d%02d%02dT%02d%02d00Z\n",
	80 end["year"], end["mon"], end["mday"], end["hour"], end["min"]
	81 print "SUMMARY:" sum
	82 print "DESCRIPTION:" des
	83 print "CATEGORIES:" cat
	84 print "LOCATION:" loc
	85 print "END:VEVENT"
	86 }
	87
	88 END {
	89 print ""
	90 print "END:VCALENDAR"
	91 }