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	ttxt2ics - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://hg6vgqziawt5s4dj.onion/ics2txt
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	ttxt2ics (2111B)
	---
	1 #!/usr/bin/awk -f
	2
	3 function prompt(msg)
	4 {
	5 if (TTY)
	6 printf("%s", msg) >"/dev/stderr";
	7 if (!getline str)
	8 exit(1);
	9 return str;
	10 }
	11
	12 function parse_date(str, tm)
	13 {
	14 if (length(str) == 5) {
	15 "date +%Y/%m/%d" \| getline date
	16 str = date " " str ;
	17 close("date +%Y/%m/%d");
	18 }
	19
	20 if (length(str) != 16) {
	21 print("invalid date length") >"/dev/stderr";
	22 return -1;
	23 }
	24
	25 tm["yrs"] = substr(str, 1, 4);
	26 if (! match(tm["yrs"], "^[0-9]+$")) {
	27 print("invalid year: " tm["yrs"]) >"/dev/stderr";
	28 return -1;
	29 }
	30
	31 tm["mth"] = substr(str, 6, 2);
	32 if (! match(tm["mth"], "^[0-1][0-9]$")) {
	33 print("invalid month: " tm["mth"]) >"/dev/stderr";
	34 return -1;
	35 }
	36
	37 tm["day"] = substr(str, 9, 2);
	38 if (! match(tm["day"], "^[0-3][0-9]$")) {
	39 print("invalid day: " tm["day"]) >"/dev/stderr";
	40 return -1;
	41 }
	42
	43 tm["hrs"] = substr(str, 12, 2);
	44 if (! match(tm["hrs"], "^[0-2][0-9]$")) {
	45 print("invalid hours: " tm["hrs"]) >"/dev/stderr";
	46 return -1;
	47 }
	48
	49 tm["min"] = substr(str, 15, 2);
	50 if (! match(tm["min"], "^[0-6][0-9]$")) {
	51 print("invalid minutes: " tm["min"]) >"/dev/stderr";
	52 return -1;
	53 }
	54
	55 return 0;
	56 }
	57
	58 BEGIN {
	59 TTY = !system("tty >/dev/null");
	60
	61 if (TTY) {
	62 "date +%Y" \| getline yrs
	63 close("date +%Y");
	64 system("cal " yrs ">/dev/stderr");
	65 system("date >/dev/stderr");
	66 system("date +'%Y/%m/%d %H:%M' >/dev/stderr");
	67 print("") >"/dev/stderr";
	68 }
	69
	70 do beg = prompt("Start [YYYY/MM/DD HH:MM] or [HH:MM] for today: …
	71 while (parse_date(beg, tm_beg) == -1);
	72
	73 do end = prompt("End [YYYY/MM/DD HH:MM] or [HH:MM] for same da…
	74 while (parse_date(end, tm_end) == -1);
	75
	76 sum = prompt("Summary: ");
	77 cat = prompt("Category: ");
	78 loc = prompt("Location: ");
	79 des = prompt("Description: ");
	80
	81 print("BEGIN:VEVENT");
	82 print("DTSTART:" \
	83 tm_beg["yrs"] tm_beg["mth"] tm_beg["day"] "T" \
	84 tm_beg["hrs"] tm_beg["min"] "00");
	85 print("DTEND:" \
	86 tm_end["yrs"] tm_end["mth"] tm_end["day"] "T" \
	87 tm_end["hrs"] tm_end["min"] "00");
	88 if (cat) print("CATEGORIES:" cat);
	89 if (sum) print("SUMMARY:" sum);
	90 if (des) print("DESCRIPTION:" des);
	91 if (loc) print("LOCATION:" loc);
	92 print("END:VEVENT");
	93 }