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120 lines
3.9 KiB
Forth
120 lines
3.9 KiB
Forth
\ Copyright (c) 2008-2015 Devin Teske <dteske@FreeBSD.org>
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\ All rights reserved.
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\
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\ Redistribution and use in source and binary forms, with or without
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\ modification, are permitted provided that the following conditions
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\ are met:
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\ 1. Redistributions of source code must retain the above copyright
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\ notice, this list of conditions and the following disclaimer.
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\ 2. Redistributions in binary form must reproduce the above copyright
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\ notice, this list of conditions and the following disclaimer in the
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\ documentation and/or other materials provided with the distribution.
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\
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\ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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\ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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\ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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\ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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\ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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\ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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\ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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\ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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\ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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\ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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\ SUCH DAMAGE.
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\
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\ $FreeBSD$
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marker task-delay.4th
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vocabulary delay-processing
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only forth also delay-processing definitions
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2 constant delay_default \ Default delay (in seconds)
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3 constant etx_key \ End-of-Text character produced by Ctrl+C
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13 constant enter_key \ Carriage-Return character produce by ENTER
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27 constant esc_key \ Escape character produced by ESC or Ctrl+[
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variable delay_tstart \ state variable used for delay timing
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variable delay_delay \ determined configurable delay duration
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variable delay_cancelled \ state variable for user cancellation
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variable delay_showdots \ whether continually print dots while waiting
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only forth definitions also delay-processing
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: delay_execute ( -- )
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\ make sure that we have a command to execute
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s" delay_command" getenv dup -1 = if
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drop exit
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then
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\ read custom time-duration (if set)
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s" loader_delay" getenv dup -1 = if
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drop \ no custom duration (remove dup'd bunk -1)
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delay_default \ use default setting (replacing bunk -1)
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else
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\ make sure custom duration is a number
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?number 0= if
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delay_default \ use default if otherwise
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then
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then
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\ initialize state variables
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delay_delay ! \ stored value is on the stack from above
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seconds delay_tstart ! \ store the time we started
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0 delay_cancelled ! \ boolean flag indicating user-cancelled event
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false delay_showdots ! \ reset to zero and read from environment
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s" delay_showdots" getenv dup -1 <> if
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2drop \ don't need the value, just existence
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true delay_showdots !
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else
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drop
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then
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\ Loop until we have exceeded the desired time duration
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begin
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25 ms \ sleep for 25 milliseconds (40 iterations/sec)
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\ throw some dots up on the screen if desired
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delay_showdots @ if
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." ." \ dots visually aid in the perception of time
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then
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\ was a key depressed?
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key? if
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key \ obtain ASCII value for keystroke
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dup enter_key = if
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-1 delay_delay ! \ break loop
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then
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dup etx_key = swap esc_key = OR if
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-1 delay_delay ! \ break loop
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-1 delay_cancelled ! \ set cancelled flag
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then
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then
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\ if the time duration is set to zero, loop forever
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\ waiting for either ENTER or Ctrl-C/Escape to be pressed
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delay_delay @ 0> if
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\ calculate elapsed time
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seconds delay_tstart @ - delay_delay @ >
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else
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-1 \ break loop
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then
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until
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\ if we were throwing up dots, throw up a line-break
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delay_showdots @ if
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cr
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then
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\ did the user press either Ctrl-C or Escape?
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delay_cancelled @ if
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2drop \ we don't need the command string anymore
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else
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evaluate \ evaluate/execute the command string
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then
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;
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only forth definitions
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