bash_shell_menu.bash

#!/bin/bash

# shellcheck disable=SC2155,SC2015,SC2183

unselectedColor="\033[38;05;188m"
selectedColor="\033[38;05;232;48;05;188m"
resetColor="\033[m"


moveCursor() {
    tput cup "$2" "$1"
}

moveCursorEX() {
    echo -ne "\033[$(($2+1));$1f"
}

redrawMenuItems() { 
    local -n _menuItems=$1
    local startPos=$2
    local pos=$3
    local oldPos=$4

    # +1 comes from leading new line in the menu
    local menuLen=$((${#_menuItems[@]} + 2))
    local menuOldPosY=$((startPos - (menuLen - oldPos)))
    local menuNewPosY=$((startPos - (menuLen - pos)))
    
    moveCursorEX "0" "${menuOldPosY}"
    echo -ne "\t${unselectedColor}${oldPos}. ${_menuItems[${oldPos}]}${resetColor}" 

    moveCursorEX "0" "${menuNewPosY}"
    echo -ne "\t${selectedColor}${pos}. ${_menuItems[${pos}]}${resetColor}"

    moveCursorEX "0" "${startPos}"
}

drawMenu() {
    local -n _menuItems=$1
    local menuPosition=$2
    local menuTitle="$3"

    local menuwidth=${#menuTitle}
    local menuLen=$((${#_menuItems[@]}))

    echo -ne "\t${unselectedColor}";  printf '%*s' "${menuwidth}" | tr ' ' "="; echo -e "${resetColor}"
    echo -ne "\t${unselectedColor}";  echo -e " $menuTitle ${resetColor}" 
    echo -ne "\t${unselectedColor}";  printf '%*s' "${menuwidth}" | tr ' ' "="; echo -e "${resetColor}"
    echo ""
    for i in $(seq 0 ${menuLen}); do
        echo -ne "\t"
        if [[ $i -eq ${menuPosition} ]]; then
            echo -e "${selectedColor}$i. ${_menuItems[${i}]}${resetColor}" 
        else
            if [[ -n "${_menuItems[${i}]}" ]]; then
                echo -e "${unselectedColor}$i. ${_menuItems[${i}]}${resetColor}" 
            fi
        fi
    done
    # leading new line
    echo 
}

getCurrentPos(){
    local _col; local _row
    # shellcheck disable=SC2162
    IFS=';' read -sdR -p $'\E[6n' _row _col
    echo "${_col} ${_row#*[}"
}

readKey(){
    read -rsN 1 _key
    printf %d "'${_key}"   # %x for hex
}

menu(){
    local menuItems=($1)
    local menuTitle="$2"

    local keyCode=(0)
    local pos=0
    local oldPos=0

    drawMenu "menuItems" "${pos}" "${menuTitle}"

    local startPosStr=$(getCurrentPos);
    local startPos="${startPosStr#* }"

    while [[ ${keyCode[0]} -ne 10 ]]; do
        local keyCode=("$(readKey)") # byte 1
        if [[ ${keyCode[0]} -eq 27 ]]; then # escape character 
            local keyCode+=("$(readKey)") # byte 2
            if [[ ${keyCode[-1]} -ne 27 ]]; then # checking if user pressed actual
                local keyCode+=("$(readKey)")  # byte 3
                
                if [[ "51 50 48 52 53 54" =~ (^|[[:space:]])"${keyCode[2]}"($|[[:space:]]) ]]; then
                    while [[ ${keyCode[-1]} -ne 126 ]]; do
                        local keyCode+=("$(readKey)")    
                    done
                fi
                if [[ "49" =~ (^|[[:space:]])"${keyCode[2]}"($|[[:space:]]) ]]; then
                    local keyCode+=("$(readKey)")  # byte 4
                    [[ ${keyCode[-1]} -ne 126 ]] && local keyCode+=("$(readKey)") # byte 5
                    [[ ${keyCode[-1]} -eq 59 ]] && local keyCode+=("$(readKey)") # byte 5 check
                    [[ ${keyCode[-1]} -ne 126 ]] && local keyCode+=("$(readKey)")
                fi
            fi
        fi 

        local oldPos=${pos}
        case "${keyCode[*]}" in 
            "27 91 65")  local pos=$((pos - 1));;  # up
            "27 91 66")  local pos=$((pos + 1));;  # down
            "27 91 53 126") local pos=$((pos - 2));; # pgup
            "27 91 54 126") local pos=$((pos + 2));; # pgdn
            "27 91 72") local pos=0;; # home
            "27 91 70") local pos=$((${#menuItems[*]} - 1));; # end
        esac

        [[ ${pos} -lt 0 ]] && local pos=0
        [[ ${pos} -ge ${#menuItems[*]} ]] && local pos=$((${#menuItems[*]} - 1))

        redrawMenuItems "menuItems" "${startPos}" "${pos}" "${oldPos}"  

    done

    return "${pos}"
}


menu "Menu_Item_1 Menu_Item_2 Menu_Item_3 Menu_item_4 Menu_item_5" "Title Here"

case "$?" in 
    0) echo "selected 0";;
    1) echo "selected 1";;
    2) echo "selected 2";;
    3) echo "selected 3";;
    4) echo "selected 4";;
esac

ps_shell_menu.ps1

function moveCursor{ param($position)
  $host.UI.RawUI.CursorPosition = $position
}


function RedrawMenuItems{ 
    param ([array]$menuItems, $oldMenuPos=0, $menuPosition=0, $currPos)
    
    # +1 comes from leading new line in the menu
    $menuLen = $menuItems.Count + 1
    $fcolor = $host.UI.RawUI.ForegroundColor
    $bcolor = $host.UI.RawUI.BackgroundColor
    $menuOldPos = New-Object System.Management.Automation.Host.Coordinates(0, ($currPos.Y - ($menuLen - $oldMenuPos)))
    $menuNewPos = New-Object System.Management.Automation.Host.Coordinates(0, ($currPos.Y - ($menuLen - $menuPosition)))
    
    moveCursor $menuOldPos
    Write-Host "`t" -NoNewLine
    Write-Host "$oldMenuPos. $($menuItems[$oldMenuPos])" -fore $fcolor -back $bcolor -NoNewLine

    moveCursor $menuNewPos
    Write-Host "`t" -NoNewLine
    Write-Host "$menuPosition. $($menuItems[$menuPosition])" -fore $bcolor -back $fcolor -NoNewLine

    moveCursor $currPos
}

function DrawMenu { param ([array]$menuItems, $menuPosition, $menuTitel)
    $fcolor = $host.UI.RawUI.ForegroundColor
    $bcolor = $host.UI.RawUI.BackgroundColor

    $menuwidth = $menuTitel.length + 4
    Write-Host "`t" -NoNewLine;    Write-Host ("=" * $menuwidth) -fore $fcolor -back $bcolor
    Write-Host "`t" -NoNewLine;    Write-Host " $menuTitel " -fore $fcolor -back $bcolor
    Write-Host "`t" -NoNewLine;    Write-Host ("=" * $menuwidth) -fore $fcolor -back $bcolor
    Write-Host ""
    for ($i = 0; $i -le $menuItems.length;$i++) {
        Write-Host "`t" -NoNewLine
        if ($i -eq $menuPosition) {
            Write-Host "$i. $($menuItems[$i])" -fore $bcolor -back $fcolor -NoNewline
            Write-Host "" -fore $fcolor -back $bcolor
        } else {
           if ($($menuItems[$i])) {
            Write-Host "$i. $($menuItems[$i])" -fore $fcolor -back $bcolor
           } 
        }
    }
    # leading new line
    Write-Host ""
}

function Menu { param ([array]$menuItems, $menuTitel = "MENU")
    $vkeycode = 0
    $pos = 0
    $oldPos = 0
    DrawMenu $menuItems $pos $menuTitel
    $currPos=$host.UI.RawUI.CursorPosition
    While ($vkeycode -ne 13) {
        $press = $host.ui.rawui.readkey("NoEcho,IncludeKeyDown")
        $vkeycode = $press.virtualkeycode  # https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
        Write-host "$($press.character)" -NoNewLine
        $oldPos=$pos;

        Switch ($vkeycode) {
            33 {$pos = if ($pos - 2 -gt 0)  {$pos - 2} Else {0}}  #PgUP
            34 {$pos = if ($pos + 2 -lt @($menuItems).length)  {$pos + 2} Else {@($menuItems).length}} #PgDn
            35 {$pos = @($menuItems).length}  # End
            36 {$pos = 0} # Up
            38 {$pos--} # Arrow UP
            40 {$pos++} # Arrow DOWN
        }
        if ($pos -lt 0) {$pos = 0}
        if ($pos -ge $menuItems.length) {$pos = $menuItems.length -1}
        RedrawMenuItems $menuItems $oldPos $pos $currPos
    }
    Write-Output $pos
}

$bad = "a", "b", "c"
$selection = Menu $bad "Title"

Switch ($selection){
    0 { Write-Output "a" }
    1 { Write-Output "b" }
    2 { Write-Output "c" }
}

Hello, I love your PowerShell menu and want to use it in one of my scripts. During implementation i noticed, that PgUp/PgDn/End does not work as expected. I was able to fix this. Here is my modified code. I also added a variable for the page size for PgUp/PgDn and enabled rollover to be able to jump from the last entry to the first and vice versa.

Function Menu { param ([array]$menuItems, $menuTitel = "MENU")

$vkeycode = 0
$pos = 0
$oldPos = 0
$pageSize = 5
DrawMenu $menuItems $pos $menuTitel
$currPos=$host.UI.RawUI.CursorPosition
While ($vkeycode -ne 13) {
	$press = $host.ui.rawui.readkey("NoEcho,IncludeKeyDown")
	$vkeycode = $press.virtualkeycode  # https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes
	Write-host "$($press.character)" -NoNewLine
	$oldPos=$pos

	Switch ($vkeycode) {
		33 {$pos = if ($pos - $pageSize -ge 0) {$pos - 5} Else {$menuItems.length -1}} #PgUP
		34 {$pos = if ($pos + $pageSize -le $menuItems.length -1) {$pos + $pageSize} Else {0}} #PgDn
		35 {$pos = $menuItems.length -1} # End
		36 {$pos = 0} # Pos1/Home
		38 {$pos--} # Arrow UP
		40 {$pos++} # Arrow DOWN
	}
	if ($pos -lt 0) {$pos = $menuItems.length -1} # Rollover to last entry
	if ($pos -ge $menuItems.length) {$pos = 0} # Rollover to first entry
	RedrawMenuItems $menuItems $oldPos $pos $currPos
}
Write-Output $pos

}

I also have one problem - my menu has about 50 entries and it would be great if your script could make columns. I found a script that is able to do this, but it redraws the menu on every move whichis very annoying.

https://community.spiceworks.com/scripts/show/4785-create-menu-2-0-arrow-key-driven-powershell-menu-for-scripts

Do you think it would be possible for you to add columns to your script? That would be great!

Brgds Deas