Display permanently current time in Tcl

Theoretical Physics 0
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I have three questions, all of them closely related to each other. The most important one is the first one.

First: I am trying to display the current time in the format hours:minutes:seconds, so

set systemTime [clock seconds]

puts "The time is: [clock format $systemTime -format %H:%M:%S]"

But the above clock should be permanently updated, that is, the seconds-part of the clock should be running all the time.

Second: In the next step I would like to display milliseconds and they should be updated as well.

Third: I would like to execute a procedure at a certain point of time. More precisely: At a certain time, say 16:20 (the format here is hours:minutes), tcl musst execute a procedure, say proc SumUpInt, which I defined. It may be possible that I want to consider seconds and milliseconds as well when executing the proc.

I do not know how to do this. I have found many similar questions on some web sites, also on stack overflow, but I was not able to adapt some of these solutions to my problem.

Any help is welcome!

Thank you in advance.

tcl
1 Answers

There doesn't seem to be an output directive in clock format for milliseconds, so perhaps:

proc timestamp {} {
    set t [clock milliseconds]
    set systemTime [expr {int($t / 1000)}]
    set milliSeconds [expr {$t % 1000}]
    return [format "%s.%03d" [clock format $systemTime -format %T] $milliSeconds]
}

timestamp      ;# => 14:41:13.032

You can turn this "realtime" with

proc run_timestamp {} {
    puts -nonewline "\r[timestamp] "
    flush stdout
    after 100 run_timestamp
}
run_timestamp
vwait forever

But the vwait means this will block the Tcl interpreter. I don't have any thoughts right now about how to integrate this into your terminal.

glenn jackman0
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