swap-container.sh

swap-container.sh

#!/bin/bash

# A list specifies the old and new names of a workspace, then the workspace 'old' is renamed to 'new' if
# 'new' does not exist, UNLESS swapping 'old' and 'new' satisfies the name requirements. The 3rd list
# item specifies the output where the new workspace is to be moved; there may only be two but guessing
# which one is hard, it's easier to be explicit.

function move_workspace_to_output_helper { # Make new the current workspace.
    swaymsg "workspace number $1"          # Map output letter to output name. Do not insist on the colon being absent or present.
    case "${2:0:1}" in z) swaymsg "move workspace to HDMI-A-2" ;; x) swaymsg "move workspace to HDMI-A-1" ;; c) swaymsg "move workspace to VGA-1" ;; esac
}

function rename_or_swap_ws {
    z=$(swaymsg -t get_workspaces | jq -r '.[] | select(.output=="HDMI-A-2").name')
    x=$(swaymsg -t get_workspaces | jq -r '.[] | select(.output=="HDMI-A-1").name')
    c=$(swaymsg -t get_workspaces | jq -r '.[] | select(.output=="VGA-1").name') # --------------------------------------------------------------------------------------------------

    list="cancel\nz:\n$z\nx:\n$x\nc:\n$c\n"
    wscount=0
    old=
    new=
    op=
    while [ $wscount -lt 3 ]; do
        if [ $wscount -eq 0 ]; then
            if [ "_$1" = "_NaN" ]; then
                t="choose old workspace number: "
                wsws=$(echo -e "${list/==/}" | rofi -dmenu -b -p "$t")
            else
                wsws=${1:0:2}
            fi
        fi
        if [ $wscount -eq 1 ]; then
            if [ "_$2" = "_NaN" ]; then
                s="choose new workspace number: "
                wsws=$(echo -e "${list/==/}" | rofi -dmenu -b -p "$s")
            else
                wsws=${2:0:2}
            fi
        fi
        if [ $wscount -eq 2 ]; then
            if [ "_$3" = "_NaN" ]; then
                r="choose new workspace output z:HDMI-A-2 x:HDMI-A-1 c:VGA-1: "
                wsws=$(echo -e "${list/==/}" | rofi -dmenu -b -p "$r")
            else
                wsws=${3:0:2}
            fi
        fi
        echo "debug $wscount $wsws"
        case "${wsws}" in
        cancel* | ca)
            # Keep checking that this exits cleanly, endless loop bugs are a pain in the bum.
            done=1
            return
            ;;
        *)
            case "${wsws:0:2}" in
            [0-9][0-9])
                if [ ${wscount} -eq 0 ]; then
                    old="${wsws:0:2}"
                    swaymsg "workspace number ${old}"
                    wscount=1
                elif [ ${wscount} -eq 1 ]; then
                    new="${wsws:0:2}"
                    swaymsg "workspace number ${new}"
                    wscount=2
                fi
                ;;
            z: | x: | c:)
                if [ ${wscount} -eq 2 ]; then
                    op="${wsws:0:2}"
                    wscount=3
                fi
                ;;
            *)
                # via the escape key
                done=1
                ;;
            esac
            ;;
        esac
        if [ $wscount -eq 3 ]; then
            # does $old $new $op exist?
            oldex=$(echo "$z $x $c" | grep -c "$old")
            newex=$(echo "$z $x $c" | grep -c "$new")
            echo "debug $wscount: $old $oldex $new $newex $op"
            # do-while loop test is inside the loop hence the break.
            case "${newex}${oldex}" in
            ?0)
                # no old workspace with a number.
                break
                ;;
            01)
                # no such new workspace so we can rename the old workspace.
                swaymsg "rename workspace \"$old\" to \"$new\""
                sleep 1s
                move_workspace_to_output_helper "$new" "$op"
                break
                ;;
            11)
                # old and new exist and swapping their names or contents satisfies the old renaming
                # requirement, although it's debatable that new must change its number accordingly.
                echo "debug "
                tmp=$new$old
                swaymsg "rename workspace \"$old\" to \"$tmp\""
                sleep 1s
                swaymsg "rename workspace \"$new\" to \"$old\""
                sleep 1s
                swaymsg "rename workspace \"$tmp\" to \"$new\""
                sleep 1s
                move_workspace_to_output_helper "$new" "$op"
                break
                ;;
            esac
        fi
    done

}

# Workspace arguments must be double-digit numbers, output must be z|x|c colon.

rename_or_swap_ws "${1:-NaN}" "${2:-NaN}" "${3:-NaN}"