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	ttsv2ics - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws…
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	ttsv2ics (1785B)
	---
	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 FS = "\t"
	64
	65 print "BEGIN:VCALENDAR"
	66 print "VERSION:2.0"
	67 print "CALSCALE:GREGORIAN"
	68 print "METHOD:PUBLISH"
	69 }
	70
	71 NR == 1 {
	72 for (i = 1; i <= NF; i++)
	73 name[i] = $i
	74 next
	75 }
	76
	77 {
	78 for (i = 1; i <= NF; i++)
	79 ev[name[i]] = $i
	80
	81 print ""
	82 print "BEGIN:VEVENT"
	83
	84 gmtime(ev["beg"] + offset, ev)
	85 printf "DTSTART:%04d%02d%02dT%02d%02d00Z\n",
	86 ev["year"], ev["mon"], ev["mday"], ev["hour"], ev["min"]
	87
	88 gmtime(ev["end"] + offset, ev)
	89 printf "DTEND:%04d%02d%02dT%02d%02d00Z\n",
	90 ev["year"], ev["mon"], ev["mday"], ev["hour"], ev["min"]
	91
	92 print "SUMMARY:" ev["sum"]
	93 print "DESCRIPTION:" ev["des"]
	94 print "CATEGORIES:" ev["cat"]
	95 print "LOCATION:" ev["loc"]
	96 print "END:VEVENT"
	97
	98 delete ev
	99 }
	100
	101 END {
	102 print ""
	103 print "END:VCALENDAR"
	104 }