Control cursor position also at bottom of window Post: 303043681

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Top Forums Shell Programming and Scripting Control cursor position also at bottom of window Post 303043681 by Ralph on Monday 3rd of February 2020 06:28:32 PM

02-03-2020

Registered User

Quote:

Originally Posted by RudiC

Would a (man console_codes)

Code:

ESC M     RI       Reverse linefeed.

help?

Cool manual page but no... the page still scrolled up and I ended up in the next line, rather than restarting in the same line.

I think I have to check whether the cursor is in the last line of the window or not and do the reverse line feed only in that case. Together with an answer that I found elsewhere on this forum I came up with this version of the function which apparently works now:

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
}

Ralph

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LEARN ABOUT V7

col

COL(1)							      General Commands Manual							    COL(1)

NAME

       col - filter reverse line feeds

SYNOPSIS

       col [-bfx]

DESCRIPTION

       Col  reads the standard input and writes the standard output.  It performs the line overlays implied by reverse line feeds (ESC-7 in ASCII)
       and by forward and reverse half line feeds (ESC-9 and ESC-8).  Col is particularly useful for filtering multicolumn output  made  with  the
       `.rt' command of nroff and output resulting from use of the tbl(1) preprocessor.

       Although  col  accepts  half  line motions in its input, it normally does not emit them on output.  Instead, text that would appear between
       lines is moved to the next lower full line boundary.  This treatment can be suppressed by the -f (fine) option; in  this  case  the  output
       from col may contain forward half line feeds (ESC-9), but will still never contain either kind of reverse line motion.

       If  the	-b  option is given, col assumes that the output device in use is not capable of backspacing.  In this case, if several characters
       are to appear in the same place, only the last one read will be taken.

       The control characters SO (ASCII code 017), and SI (016) are assumed to start and end text in an alternate character  set.   The  character
       set  (primary or alternate) associated with each printing character read is remembered; on output, SO and SI characters are generated where
       necessary to maintain the correct treatment of each character.

       Col normally converts white space to tabs to shorten printing time.  If the -x option is given, this conversion is suppressed.

       All control characters are removed from the input except space, backspace, tab, return, newline, ESC (033) followed by one of 789, SI,  SO,
       and  VT (013).  This last character is an alternate form of full reverse line feed, for compatibility with some other hardware conventions.
       All other non-printing characters are ignored.

SEE ALSO

       troff(1), tbl(1), greek(1)

BUGS

       Can't back up more than 128 lines.
       No more than 800 characters, including backspaces, on a line.

																	    COL(1)

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