more options for selection

shell/select-option.sh

@@ -5,7 +5,7 @@ function select_option {
     local nformat
     local optcount=$#
     printf -v nformat "%%%dd. " ${#optcount}
-    local max_opt=0
+    local max_opt=$(( ${#SELECT_TITLE} - 4 ))
     local multiselected=()
     local choices=()
     local shortcuts=()
@@ -25,11 +25,20 @@ function select_option {
       fi
       ((idx++))
     done
+    if [[ $SELECT_CENTER -eq 1 ]]; then
+      local pad_center=$(( ( $( tput cols ) - $max_opt ) / 2 - 5 ))
+      if [[ $pad_center -gt 0 ]]; then
+        printf -v pad_center "%${pad_center}s" " "
+      else
+         pad_center=""
+      fi
+    fi
 
     # little helpers for terminal print control and key input
-    ESC=$( printf "\033")
+    ESC=$( printf "\033" )
     cursor_blink_on()  { printf "$ESC[?25h"; }
     cursor_blink_off() { printf "$ESC[?25l"; }
+    clear_screen() { printf "$ESC[2J"; }
     cursor_to()        { printf "$ESC[$1;${2:-1}H"; }
     if [[ $SELECT_MONOCHROME -eq 1 ]]; then
         print_option()     { printf "  $ESC[30m%s $ESC[0m%s  %s   $ESC[30m%s$ESC[0m$ESC[K" "$1" "$2" "$3" "$4"; }
@@ -63,6 +72,17 @@ function select_option {
     reset_display()  {
         cursor_blink_on; stty echo; printf '\n';
     }
+    if [[ $SELECT_MIDDLE -eq 1 ]]; then
+      clear_screen
+      cursor_to 1
+      local pad_middle=$(( ( $( tput lines ) - $optcount ) / 2 - 2 ))
+      if [[ $pad_middle -gt 0 ]]; then
+        printf "\n%.0s" $( seq 1 $pad_middle )
+      fi
+    fi
+    if [ -n "$SELECT_TITLE" ]; then
+        printf "${pad_center}   $ESC[35;1m%s$ESC[0m$ESC[K  \n" "$SELECT_TITLE"
+    fi
     # initially print empty new lines (scroll down if at bottom of screen)
     for opt; do printf "\n"; done
     # Extras for top and bottom
@@ -71,11 +91,17 @@ function select_option {
     # determine current screen position for overwriting the options
     local lastrow=`get_cursor_row`
     local startrow=$(( $lastrow - $# - 2 ))
+    #~ if [ -n "$SELECT_TITLE" ]; then
+      #~ ((startrow--))
+      #~ ((startrow--))
+    #~ fi
     local toprow="+~~--"
     local bottomrow="--~~+"
     local lborderchars="|:'"
     local rborderchars="|:."
 
+
+
     # ensure cursor and input echoing back on upon a ctrl+c during read -s
     trap "cursor_blink_on; stty echo; printf '\n'; exit 1" 2
     cursor_blink_off
@@ -100,7 +126,7 @@ function select_option {
         cursor_to $startrow
         if [ $selected -lt 0 ]; then selected=$(($# - 1)); fi
         if [ $selected -ge $# ]; then selected=0; fi
-        printf "  $ESC[30m%s$ESC[0m$ESC[K  " "$toprow"
+        printf "${pad_center}  $ESC[30m%s$ESC[0m$ESC[K  " "$toprow"
 
         for opt; do
             opt="${choices[$idx]}"
@@ -119,6 +145,7 @@ function select_option {
             fi
             printf -v padopt "%-${max_opt}s" "$opt"
             cursor_to $(($startrow + $idx + 1))
+            printf "%s" "${pad_center}"
             if [ $idx -eq $selected ]; then
                 print_selected "$lborder" "$nidx$shortcut" "$padopt"  "$rborder"
             else
@@ -131,7 +158,7 @@ function select_option {
             ((idx++))
         done
         cursor_to $(($startrow + $idx + 1))
-        printf "$ESC[K$ESC[30m%${bottomlength}s$ESC[0m  " "$bottomrow"
+        printf "${pad_center}$ESC[K$ESC[30m%${bottomlength}s$ESC[0m  " "$bottomrow"
 
         # user key control
         local user_input=`key_input`
@@ -180,12 +207,15 @@ _help() {
   echo "Select Option [Pure BASH]
   Adapted from: https://unix.stackexchange.com/questions/146570/arrow-key-enter-menu
 
-  Usage: $SELF [-nms_] [--nc] [-o File] list of options
+  Usage: $SELF [-nms_] [--nc] [-o File] [--title Title] list of options
     -n       Show item number
     -m       Multiple choice selection. Note that only 7 options can be encoded
              reliably in return value. Use File output for more options.
     -s       Show shortcuts
     --nc     No colors
+    --title  Shows a title above selection
+    --center Center box on screen
+    --middle Clear screen and position in the middle
     -o File  Save the choice(s) in a file.
     -_       Print spaces instead of underscores, workaround for
              shell arguments containing spaces.
@@ -242,13 +272,19 @@ SELECT_SHORTCUTS=0
 SELECT_NUMBERS=0
 SELECT_UNDERSCORES=0
 SELECT_MULTI=0
+SELECT_CENTER=0
+SELECT_MIDDLE=0
 SELECT_TOFILE=""
+SELECT_TITLE=""
 for (( i=1; i<=$#; i++ )); do
   value=${!i}
   j=$(( i + 1 ))
   [[ "$value" = "--help" ]] && _help
   [[ "$value" = "--nc" ]] && { SELECT_MONOCHROME=1; continue; }
   [[ "$value" = "--package" ]] && { _package_self; exit; }
+  [[ "$value" = "--center" ]] && { SELECT_CENTER=1; continue; }
+  [[ "$value" = "--middle" ]] && { SELECT_MIDDLE=1; continue; }
+  [[ "$value" = "--title" ]] && { SELECT_TITLE="${!j}"; ((i++)); continue; }
   [[ "${value}" = "-"* ]] && {
     [[ "$value" =~ -.*h ]] && { _help; }
     [[ "$value" =~ -.*m ]] && { SELECT_MULTI=1; }