1 \ Copyright (c) 2008-2015 Devin Teske <dteske@FreeBSD.org>
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29 vocabulary delay-processing
30 only forth also delay-processing definitions
32 2 constant delay_default \ Default delay (in seconds)
33 3 constant etx_key \ End-of-Text character produced by Ctrl+C
34 13 constant enter_key \ Carriage-Return character produce by ENTER
35 27 constant esc_key \ Escape character produced by ESC or Ctrl+[
37 variable delay_tstart \ state variable used for delay timing
38 variable delay_delay \ determined configurable delay duration
39 variable delay_cancelled \ state variable for user cancellation
40 variable delay_showdots \ whether continually print dots while waiting
42 only forth definitions also delay-processing
44 : delay_execute ( -- )
46 \ make sure that we have a command to execute
47 s" delay_command" getenv dup -1 = if
51 \ read custom time-duration (if set)
52 s" loader_delay" getenv dup -1 = if
53 drop \ no custom duration (remove dup'd bunk -1)
54 delay_default \ use default setting (replacing bunk -1)
56 \ make sure custom duration is a number
58 delay_default \ use default if otherwise
62 \ initialize state variables
63 delay_delay ! \ stored value is on the stack from above
64 seconds delay_tstart ! \ store the time we started
65 0 delay_cancelled ! \ boolean flag indicating user-cancelled event
67 false delay_showdots ! \ reset to zero and read from environment
68 s" delay_showdots" getenv dup -1 <> if
69 2drop \ don't need the value, just existence
75 \ Loop until we have exceeded the desired time duration
77 25 ms \ sleep for 25 milliseconds (40 iterations/sec)
79 \ throw some dots up on the screen if desired
81 ." ." \ dots visually aid in the perception of time
84 \ was a key depressed?
86 key \ obtain ASCII value for keystroke
88 -1 delay_delay ! \ break loop
90 dup etx_key = swap esc_key = OR if
91 -1 delay_delay ! \ break loop
92 -1 delay_cancelled ! \ set cancelled flag
96 \ if the time duration is set to zero, loop forever
97 \ waiting for either ENTER or Ctrl-C/Escape to be pressed
99 \ calculate elapsed time
100 seconds delay_tstart @ - delay_delay @ >
106 \ if we were throwing up dots, throw up a line-break
111 \ did the user press either Ctrl-C or Escape?
113 2drop \ we don't need the command string anymore
115 evaluate \ evaluate/execute the command string
119 only forth definitions