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Full Discussion: Control cursor position also at bottom of window
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
Old 02-03-2020
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?
 

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LEARN ABOUT OPENSOLARIS

tk_messagebox

tk_messageBox(1T)					       Tk Built-In Commands						 tk_messageBox(1T)

__________________________________________________________________________________________________________________________________________________

NAME

       tk_messageBox - pops up a message window and waits for user response.

SYNOPSIS

       tk_messageBox ?option value ...?
_________________________________________________________________

DESCRIPTION

       This procedure creates and displays a message window with an application-specified message, an icon and a set of buttons.  Each of the but-
       tons in the message window is identified by a unique symbolic name (see the -type options).  After the message window is popped up, tk_mes-
       sageBox waits for the user to select one of the buttons. Then it returns the symbolic name of the selected button.

       The following option-value pairs are supported:

       -default name
	      Name  gives the symbolic name of the default button for this message window ('ok', 'cancel', and so on). See -type for a list of the
	      symbolic names.  If this option is not specified, the first button in the dialog will be made the default.

       -icon iconImage
	      Specifies an icon to display. IconImage must be one of the following: error, info, question or warning. If this option is not speci-
	      fied, then the info icon will be displayed.

       -message string
	      Specifies the message to display in this message box.

       -parent window
	      Makes window the logical parent of the message box. The message box is displayed on top of its parent window.

       -title titleString
	      Specifies a string to display as the title of the message box. The default value is an empty string.

       -type predefinedType
	      Arranges for a predefined set of buttons to be displayed. The following values are possible for predefinedType:

	      abortretryignore	Displays three buttons whose symbolic names are abort, retry and ignore.

	      ok		Displays one button whose symbolic name is ok.

	      okcancel		Displays two buttons whose symbolic names are ok and cancel.

	      retrycancel	Displays two buttons whose symbolic names are retry and cancel.

	      yesno		Displays two buttons whose symbolic names are yes and no.

	      yesnocancel	Displays three buttons whose symbolic names are yes, no and cancel.

EXAMPLE

	      set answer [tk_messageBox -message "Really quit?" -type yesno -icon question]
	      switch -- $answer {
		  yes exit
		  no {tk_messageBox -message "I know you like this application!" 
			  -type ok}
	      }

KEYWORDS

       message box

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTk	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tk is available on http://opensolaris.org.

Tk									4.2							 tk_messageBox(1T)
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