add timeout

shell/select-option.sh

@@ -50,7 +50,8 @@ function select_option {
         print_multiselected()   { printf "$ESC[32;1m*$ESC[0m"; }
     fi
     get_cursor_row()   { IFS=';' read -sdR -p $'\E[6n' ROW COL; echo ${ROW#*[}; }
-    key_input()        { read -s -n1 key1 2>/dev/null >&2
+    key_input()        { read -s -n1 $SELECT_TIMEOUT key1 2>/dev/null >&2
+                         timeoutec=$?
                          read -s -n2 -t 0.1 key2 2>/dev/null >&2
                          local idx=$selected
                          while true; do
@@ -60,6 +61,7 @@ function select_option {
                            fi
                            if [[ $idx -eq $selected ]]; then break; fi
                          done
+                         if [[ $timeoutec = 142 ]]; then echo esc; return; fi
                          if [[ $key1$key2 = $ESC[A ]]; then echo up; return; fi
                          if [[ $key1$key2 = $ESC[B ]]; then echo down; return; fi
                          if [[ $key1$key2 = $ESC[C ]]; then echo left; return; fi
@@ -207,7 +209,7 @@ _help() {
   echo "Select Option [Pure BASH]
   Adapted from: https://unix.stackexchange.com/questions/146570/arrow-key-enter-menu
 
-  Usage: $SELF [-nms_] [--nc] [-o File] [--title Title] list of options
+  Usage: $SELF [-nms_] [--nc] [-o File] [--title Title] [--timeout #] list of options
     -n       Show item number
     -m       Multiple choice selection. Note that only 7 options can be encoded
              reliably in return value. Use File output for more options.
@@ -216,6 +218,7 @@ _help() {
     --title  Shows a title above selection
     --center Center box on screen
     --middle Clear screen and position in the middle
+    --timeout #  Set timeout in seconds
     -o File  Save the choice(s) in a file.
     -_       Print spaces instead of underscores, workaround for
              shell arguments containing spaces.
@@ -276,6 +279,7 @@ SELECT_CENTER=0
 SELECT_MIDDLE=0
 SELECT_TOFILE=""
 SELECT_TITLE=""
+SELECT_TIMEOUT=""
 for (( i=1; i<=$#; i++ )); do
   value=${!i}
   j=$(( i + 1 ))
@@ -285,6 +289,7 @@ for (( i=1; i<=$#; i++ )); do
   [[ "$value" = "--center" ]] && { SELECT_CENTER=1; continue; }
   [[ "$value" = "--middle" ]] && { SELECT_MIDDLE=1; continue; }
   [[ "$value" = "--title" ]] && { SELECT_TITLE="${!j}"; ((i++)); continue; }
+  [[ "$value" = "--timeout" ]] && { SELECT_TIMEOUT="-t ${!j}"; ((i++)); continue; }
   [[ "${value}" = "-"* ]] && {
     [[ "$value" =~ -.*h ]] && { _help; }
     [[ "$value" =~ -.*m ]] && { SELECT_MULTI=1; }