1 \ Copyright (c) 2008-2011 Devin Teske <dteske@FreeBSD.org>
4 \ Redistribution and use in source and binary forms, with or without
5 \ modification, are permitted provided that the following conditions
7 \ 1. Redistributions of source code must retain the above copyright
8 \ notice, this list of conditions and the following disclaimer.
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29 2 constant delay_default \ Default delay (in seconds)
30 3 constant etx_key \ End-of-Text character produced by Ctrl+C
31 13 constant enter_key \ Carriage-Return character produce by ENTER
32 27 constant esc_key \ Escape character produced by ESC or Ctrl+[
34 variable delay_tstart \ state variable used for delay timing
35 variable delay_delay \ determined configurable delay duration
36 variable delay_cancelled \ state variable for user cancellation
37 variable delay_showdots \ whether continually print dots while waiting
39 : delay_execute ( -- )
41 \ make sure that we have a command to execute
42 s" delay_command" getenv dup -1 = if
46 \ read custom time-duration (if set)
47 s" loader_delay" getenv dup -1 = if
48 drop \ no custom duration (remove dup'd bunk -1)
49 delay_default \ use default setting (replacing bunk -1)
51 \ make sure custom duration is a number
53 delay_default \ use default if otherwise
57 \ initialize state variables
58 delay_delay ! \ stored value is on the stack from above
59 seconds delay_tstart ! \ store the time we started
60 0 delay_cancelled ! \ boolean flag indicating user-cancelled event
62 false delay_showdots ! \ reset to zero and read from environment
63 s" delay_showdots" getenv dup -1 <> if
64 2drop \ don't need the value, just existance
70 \ Loop until we have exceeded the desired time duration
72 25 ms \ sleep for 25 milliseconds (40 iterations/sec)
74 \ throw some dots up on the screen if desired
76 ." ." \ dots visually aid in the perception of time
79 \ was a key depressed?
81 key \ obtain ASCII value for keystroke
83 -1 delay_delay ! \ break loop
85 dup etx_key = swap esc_key = OR if
86 -1 delay_delay ! \ break loop
87 -1 delay_cancelled ! \ set cancelled flag
91 \ if the time duration is set to zero, loop forever
92 \ waiting for either ENTER or Ctrl-C/Escape to be pressed
94 \ calculate elapsed time
95 seconds delay_tstart @ - delay_delay @ >
101 \ if we were throwing up dots, throw up a line-break
106 \ did the user press either Ctrl-C or Escape?
108 2drop \ we don't need the command string anymore
110 evaluate \ evaluate/execute the command string