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       ttcal2tsv - ics2txt - convert icalendar .ics file to plain text
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       ---
       ttcal2tsv (1638B)
       ---
            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)) % 2)
           11 }
           12 
           13 function maketime(tm,
           14         sec, mon, day)
           15 {
           16         sec = tm["sec"] + tm["min"] * 60 + tm["hour"] * 3600
           17 
           18         day = tm["mday"] - 1
           19 
           20         for (mon = tm["mon"] - 1; mon > 0; mon--)
           21                 day = day + mdays(mon, tm["year"])
           22 
           23         # constants: x * 365 + x / 400 - x / 100 + x / 4
           24         day = day + int(tm["year"] / 400) * 146097
           25         day = day + int(tm["year"] % 400 / 100) * 36524
           26         day = day + int(tm["year"] % 100 / 4) * 1461
           27         day = day + int(tm["year"] % 4 / 1) * 365
           28 
           29         return sec + (day - 719527) * 86400
           30 }
           31 
           32 function text_to_epoch(str, tz,
           33         tm)
           34 {
           35         tm["year"] = substr(str, 1, 4)
           36         tm["mon"] = substr(str, 6, 2)
           37         tm["mday"] = substr(str, 9, 2)
           38         tm["hour"] = substr(str, 12, 2)
           39         tm["min"] = substr(str, 15, 2)
           40         return maketime(tm) - tz
           41 }
           42 
           43 BEGIN {
           44         FIELDS = "beg end cat loc sum des"
           45         fields["len"] = split(FIELDS, fields, " ")
           46 
           47         for (i = 1; i <= fields["len"]; i++) {
           48                 pos[fields[i]] = i
           49                 printf("%s%s", (i > 1 ? "\t" : ""), fields[i])
           50         }
           51         printf("\n")
           52 }
           53 
           54 {
           55         gsub(/\t/, " ")
           56 }
           57 
           58 /^TZ[+-]/ {
           59         TZOFFSET = substr($1, 3, 1) substr($0, 4, 2)*3600 + substr($0, 6, 2)*60
           60         while (getline && $0 ~ /^$/)
           61                 continue
           62 }
           63 
           64 /^[0-9]+-[0-9]+-[0-9]+/ {
           65         if ("beg" in ev)
           66                 ev["end"] = text_to_epoch($0, TZOFFSET)
           67         else
           68                 ev["beg"] = text_to_epoch($0, TZOFFSET)
           69         next
           70 }
           71 
           72 /^ / {
           73         tag = $1
           74         sub("^ *[^ :]+: *", "")
           75         sub(":$", "", tag)
           76         ev[tag] = $0
           77         next
           78 }
           79 
           80 /^$/ {
           81         for (i = 1; i <= fields["len"]; i++)
           82                 printf("%s%s", (i > 1 ? "\t" : ""), ev[fields[i]])
           83         printf("\n")
           84         delete ev
           85 }