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- # alarm --- set an alarm
- # Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
- # May 1993
-
- # usage: alarm time [ "message" [ count [ delay ] ] ]
-
- BEGIN \
- {
- # Initial argument sanity checking
- usage1 = "usage: alarm time ['message' [count [delay]]]"
- usage2 = sprintf("\t(%s) time ::= hh:mm", ARGV[1])
-
- if (ARGC < 2) {
- print usage > "/dev/stderr"
- exit 1
- } else if (ARGC == 5) {
- delay = ARGV[4] + 0
- count = ARGV[3] + 0
- message = ARGV[2]
- } else if (ARGC == 4) {
- count = ARGV[3] + 0
- message = ARGV[2]
- } else if (ARGC == 3) {
- message = ARGV[2]
- } else if (ARGV[1] !~ /[0-9]?[0-9]:[0-9][0-9]/) {
- print usage1 > "/dev/stderr"
- print usage2 > "/dev/stderr"
- exit 1
- }
-
- # set defaults for once we reach the desired time
- if (delay == 0)
- delay = 180 # 3 minutes
- if (count == 0)
- count = 5
- if (message == "")
- message = sprintf("\aIt is now %s!\a", ARGV[1])
- else if (index(message, "\a") == 0)
- message = "\a" message "\a"
- # split up dest time
- split(ARGV[1], atime, ":")
- hour = atime[1] + 0 # force numeric
- minute = atime[2] + 0 # force numeric
-
- # get current broken down time
- gettimeofday(now)
-
- # if time given is 12-hour hours and it's after that
- # hour, e.g., `alarm 5:30' at 9 a.m. means 5:30 p.m.,
- # then add 12 to real hour
- if (hour < 12 && now["hour"] > hour)
- hour += 12
-
- # set target time in seconds since midnight
- target = (hour * 60 * 60) + (minute * 60)
-
- # get current time in seconds since midnight
- current = (now["hour"] * 60 * 60) + \
- (now["minute"] * 60) + now["second"]
-
- # how long to sleep for
- naptime = target - current
- if (naptime <= 0) {
- print "time is in the past!" > "/dev/stderr"
- exit 1
- }
- # zzzzzz..... go away if interrupted
- if (system(sprintf("sleep %d", naptime)) != 0)
- exit 1
-
- # time to notify!
- command = sprintf("sleep %d", delay)
- for (i = 1; i <= count; i++) {
- print message
- # if sleep command interrupted, go away
- if (system(command) != 0)
- break
- }
-
- exit 0
- }
-