Control cursor position also at bottom of window Post: 303043675

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Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043675 by Ralph on Monday 3rd of February 2020 03:36:05 PM

02-03-2020

Registered User

Control cursor position also at bottom of window

I have a slight problem controlling the cursor position in a Bash terminal window. I have a function ask a question and then wait for an answer which is either 'y' or 'n' or a carriage return. Whenever the user enters anything else it just erases the answer and waits for the next one. However, the script behaves differently when the cursor is on the bottom line of a window as compared to any other line.

Code:

#!/bin/bash

# -----
# function: askYesOrNo
# purpose : ask question passed as $1
# return  : 0 if answer was y or Y, 
#           1 otherwise
# -----
function askYesOrNo {
        printf "\e[1;31;47m$1 [Y|n]\e[0m "      # print $1 in color
        printf "\e[s"                           # save cursor x-pos

        while true ; do
                read answer
                if [ -z "$answer" ] ; then
                        return 0
                elif [ "$(tr -d "NnYy" <<< $answer)" != "$answer" ] ; then
                        break
                fi
                # restore cursor x-pos, erase rest of line
#               printf "\e[u\e[K"     
                # restore cursor x-pos, erase rest of line
                printf "\e[u\e[1A\e[K"      
        done
        if [ "${answer^}" == "Y" ]; then
                return 0
        fi
        return 1
}


for (( i = 100, max = 110; i <= max; i++ )) ; do
        printf " %d\n" $i
        if [ $i -eq $max ] ; then
                if askYesOrNo "Do you wish to continue?" ; then
                        (( max += 10 ))
                fi
        fi
done

The for-loop is the 'productive' part. It just puts out numbers in a column. Every 10 numbers it asks if the user wants to continue and uses the function askYesOrNo for that purpose.

The problem lies with the two lines in the function askYesOrNo (at the end of the while-loop) and when the user enters an answer that is not Y, y, N, n or Enter. The first line (now commented out) works fine when the cursor is not in the bottom line of the window. But if it is then the window scrolls up and the next answer appears in the next line.

The second version moves the cursor one line up and that's fine with the cursor at the bottom of the window but not if the question is asked elsewhere.

How can I get this to work in every situation?

Ralph

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LEARN ABOUT SUSE

glutsetcursor

glutSetCursor(3GLUT)						       GLUT						      glutSetCursor(3GLUT)

NAME

       glutSetCursor - changes the cursor image of the current window.

SYNTAX

       void glutSetCursor(int cursor);

ARGUMENTS

       cursor	 Name of cursor image to change to.  Possible values follow:

       GLUT_CURSOR_RIGHT_ARROW
	       Arrow pointing up and to the right.

       GLUT_CURSOR_LEFT_ARROW
	       Arrow pointing up and to the left.

       GLUT_CURSOR_INFO
	       Pointing hand.

       GLUT_CURSOR_DESTROY
	       Skull & cross bones.

       GLUT_CURSOR_HELP
	       Question mark.

       GLUT_CURSOR_CYCLE
	       Arrows rotating in a circle.

       GLUT_CURSOR_SPRAY
	       Spray can.

       GLUT_CURSOR_WAIT
	       Wrist watch.

       GLUT_CURSOR_TEXT
	       Insertion point cursor for text.

       GLUT_CURSOR_CROSSHAIR
	       Simple cross-hair.

       GLUT_CURSOR_UP_DOWN
	       Bi-directional pointing up & down.

       GLUT_CURSOR_LEFT_RIGHT
	       Bi-directional pointing left & right.

       GLUT_CURSOR_TOP_SIDE
	       Arrow pointing to top side.

       GLUT_CURSOR_BOTTOM_SIDE
	       Arrow pointing to bottom side.

       GLUT_CURSOR_LEFT_SIDE
	       Arrow pointing to left side.

       GLUT_CURSOR_RIGHT_SIDE
	       Arrow pointing to right side.

       GLUT_CURSOR_TOP_LEFT_CORNER
	       Arrow pointing to top-left corner.

       GLUT_CURSOR_TOP_RIGHT_CORNER
	       Arrow pointing to top-right corner.

       GLUT_CURSOR_BOTTOM_RIGHT_CORNER
	       Arrow pointing to bottom-left corner.

       GLUT_CURSOR_BOTTOM_LEFT_CORNER
	       Arrow pointing to bottom-right corner.

       GLUT_CURSOR_FULL_CROSSHAIR
	       Full-screen cross-hair cursor (if possible, otherwise GLUT_CURSOR_CROSSHAIR).

       GLUT_CURSOR_NONE
	       Invisible cursor.

       GLUT_CURSOR_INHERIT
	       Use parent's cursor.

DESCRIPTION

       glutSetCursor  changes  the cursor image of the current window.	Each call requests the window system change the cursor appropriately.  The
       cursor image when a window is created is GLUT_CURSOR_INHERIT. The exact cursor images used are implementation dependent. The intent is  for
       the image to convey the meaning of the cursor name. For a top-level window, GLUT_CURSOR_INHERIT uses the default window system cursor.

X IMPLEMENTATION NOTES

       GLUT for X uses SGI's _SGI_CROSSHAIR_CURSOR convention to access a full-screen cross-hair cursor if possible.

SEE ALSO

       glutCreateWindow, glutCreateSubWindow

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7						      glutSetCursor(3GLUT)

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