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Full Discussion: Bash loop hording keypress input
Top Forums Shell Programming and Scripting Bash loop hording keypress input Post 302915804 by DarkPhoenix on Thursday 4th of September 2014 10:18:31 PM
Old 09-04-2014
Bash loop hording keypress input
I have a bash loop that waits for a single key press, then does $something depending on what $key is pressed before refreshing the screen with updated data. The problem I have is that the script will store additional key presses and chain them together causing the screen to redraw and the script seemingly halt while the backlog of key presses get ran. Is there any way to force the script to wait and/or discard additional key presses until the screen finishes a single refresh. Script looks similar to the below

Code:
#!/bin/bash
 default vars
 loop
   drawscreen
   wait for input
   if 'a'
     do something
     back to top of loop
   if 'b"
     do anything
     back to top of loop
   if 'c'
     break
 done

I am using 'read -n1 -e answer' for input if that makes a difference
Last edited by DarkPhoenix; 09-04-2014 at 11:21 PM.. Reason: hosed formatting
 

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keyboard_translatekeys

keyboard_translatekeys(3)					Svgalib User Manual					 keyboard_translatekeys(3)

NAME

       keyboard_translatekeys - modify scancode mappings in raw keyboard mode

SYNOPSIS

       #include <vgakeyboard.h>

       void keyboard_translatekeys(int mask);

DESCRIPTION

       This function sets several flags which control how certain scancodes are mapped. At startup a mask value of 0 is active.

       mask must be a logical or of zero or more of the following #predefined integers to turn the features listed on:

       TRANSLATE_CURSORKEYS
	      Translate  the scancodes of the SCANCODE_CURSORBLOCK* keys to those of the cursor keys on the number pad, s.t.  keyboard_getstate(3)
	      and keyboard_keypressed(3) report a keypress of the corresponding number pad cursor key and not the one on the cursor block.

       TRANSLATE_DIAGONAL
	      Translates the scancodes of diagonal cursor keys (keypad 7, 9, 1, 3) to presses of two of the ordinary up, down, left,  right  keys.
	      For  example, instead of reporting a press of SCANCODE_CURSORUPRIGHT keyboard_getstate(3) and keyboard_keypressed(3) report a simul-
	      taneous press of SCANCODE_CURSORUP and SCANCODE_CURSORRIGHT.

       TRANSLATE_KEYPADENTER
	      The scancode of the keypad enter key is mapped to that of the ordinary  enter  key,  s.t.   keyboard_getstate(3)	and  keyboard_key-
	      pressed(3) report a press of SCANCODE_ENTER regardless if keypad enter or ordinary enter is pressed.

       DONT_CATCH_CTRLC
	      Pressing	<Ctrl>-C  does not raise a SIGINT.  On contrary to the other flags this has also effect when a user defined keyboard event
	      handler is used. Svgalib will always process <Alt>-F1 - <Alt>-F10 and perform console switches accordingly.

BUGS

       The TRANSLATE_* options above do really do simple scancode translations. For example, when TRANSLATE_KEYPADENTER is  active  and  the  user
       presses both enter and keypad enter. Then, if he releases one of them (say keypad enter), it's release event will clear the common keyboard
       state, s.t.  no keypress is reported even though enter is still pressed.

       Similarly, if TRANSLATE_DIAGONAL is active, the user holds cursor upleft (keypad 7) down and then presses and release cursor up (keypad 8),
       svgalib	will  only report a pressed cursor left but the simulated cursor up will be lost. You can easily try this with the keytest(6) demo
       to make the effect more clear to you.

SEE ALSO

       svgalib(7),    vgagl(7),    libvga.config(5),	keytest(6),    eventtest(6),	keyboard_seteventhandler(3),	keyboard_init(3),     key-
       board_init_return_fd(3),   keyboard_close(3),   keyboard_update(3),   keyboard_waitforupdate(3),  keyboard_setdefaulteventhandler(3),  key-
       board_getstate(3), keyboard_clearstate(3), keyboard_keypressed(3), vga_waitevent(3)

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally  this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						   29 July 1997 					 keyboard_translatekeys(3)
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