Control cursor position also at bottom of window Post: 303043740

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Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043740 by Ralph on Wednesday 5th of February 2020 09:22:13 AM

02-05-2020

Registered User

Quote:

Originally Posted by RudiC

Mind to share your final version here?

It's still the same as what I posted earlier. A bit longer than it has to be because of all the ifs and comments. I like the way you used parameter expansion in your version, but your version didn't scroll right on my system - an ordinary terminal emulator running Bash 5 on a Debian Linux.

Here my currently final version again:

Code:

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

                # How many lines in this window?
                LINES=$(tput lines)

                # find cursor y-position ( line number )
                printf "\e[6n" ; read -sd R POS
                CURPOS=${POS#*[}; CUR_Y=${CURPOS%;*}

                if [ "$CUR_Y" -eq "$LINES" ] ; then
#                       printf "\e[u\e[1A\e[K" 
                        printf "\e[u\eM\e[K"
                else
                        printf "\e[u\e[K"
                fi
        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

Only complaint now is that when the question is asked at the very bottom of the window the cursor still jumps to the next line, the window scrolls but the cursor jumps back to the end of the question. That can be avoided by using read -n 1 - as wisecracker suggested - but I like to use the Enter key to confirm.

Does it run the same way on your system?

Last edited by Ralph; 02-05-2020 at 10:24 AM.. Reason: typos

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LEARN ABOUT DEBIAN

backgammon

BACKGAMMON(6)							 BSD Games Manual						     BACKGAMMON(6)

NAME

     backgammon -- the game of backgammon
     teachgammon -- learn to play backgammon

SYNOPSIS

     backgammon [-] [-nrwb] [-pr] [-pw] [-pb] [-t term] [-s file]
     teachgammon

DESCRIPTION

     This program lets you play backgammon against the computer or against a "friend".	All commands are only one letter, so you don't need to
     type a carriage return, except at the end of a move.  The program is mostly self-explanatory, so that a question mark (?) will usually get
     some help.  If you answer `y' when the program asks if you want the rules, you will get text explaining the rules of the game, some hints on
     strategy, instructions on how to use the program, and a tutorial consisting of a practice game against the computer.  A description of how to
     use the program can be obtained by answering `y' when it asks if you want instructions.

     The possible arguments for backgammon (most are unnecessary but some are very convenient) consist of:

     -n      don't ask for rules or instructions

     -r      player is red (implies n)

     -w      player is white (implies n)

     -b      two players, red and white (implies n)

     -pr     print the board before red's turn

     -pw     print the board before white's turn

     -pb     print the board before both player's turn

     -t term
	     terminal is type term, uses /usr/share/misc/termcap

     -s file
	     recover previously saved game from file

     Any unrecognized arguments are ignored.  An argument of a lone `-' gets a description of possible arguments.

     If term has capabilities for direct cursor movement (see termcap(5)) backgammon ``fixes'' the board after each move, so the board does not
     need to be reprinted, unless the screen suffers some horrendous malady.  Also, any `p' option will be ignored.  (The `t' option is not neces-
     sary unless the terminal type does not match the entry in the /usr/share/misc/termcap data base.)

QUICK REFERENCE

     When the program prompts by typing only your color, type a space or carriage return to roll, or

     d	     to double

     p	     to print the board

     q	     to quit

     s	     to save the game for later

     When the program prompts with 'Move:', type

     p	     to print the board

     q	     to quit

     s	     to save the game

     or a move, which is a sequence of

     s-f     move from s to f

     s/r     move one man on s the roll r separated by commas or spaces and ending with a newline.  Available abbreviations are

	     s-f1-f2
		     means s-f1,f1-f2

	     s/r1r2  means s/r1,s/r2

     Use b for bar and h for home, or 0 or 25 as appropriate.

AUTHOR

     Alan Char

FILES

     /usr/games/teachgammon   rules and tutorial
     /usr/share/misc/termcap  terminal capabilities

BUGS

     The program's strategy needs much work.

BSD
								   May 31, 1993 							       BSD

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