feat(zsh): whiptail helpers

.zshrc

@@ -311,16 +311,61 @@ bindkey -M viins '\en' nnn-file-widget
 
 # Whiptail helper
 #
-menu_choose() {
+# see https://stackoverflow.com/questions/1970180/whiptail-how-to-redirect-output-to-environment-variable
+
+whiptail_checklist() {
+  autoload zmathfunc; zmathfunc  # min, max, sum
+  eval $(resize)  # COLUMNS, LINES
+
   local res title="$1" text="$2"
+  (( width=max(30, $#text) ))
   shift 2
 
+  # Make tags compatible with whiptail
   local -a tags
-  for tag;
-    { tags+=($tag $tag) }
+  for tag; do
+    tags+=($tag $tag 0)
+    (( width=max(width, $#tag) ))
+  done
 
-    # see https://stackoverflow.com/questions/1970180/whiptail-how-to-redirect-output-to-environment-variable
-  tag=$(whiptail --title $title --menu $text 25 40 15 $tags --notags 3>&1 1>&2 2>&3 3>&-)
+  # Compute "best" width & height
+  (( list_height=min(20, ${#*}, LINES * .5) ))
+  (( height=min(list_height+8, LINES) ))
+  (( width=min(width + 9, COLUMNS * .75) ))
+
+  tag=$(whiptail --title $title \
+          --checklist $text $height $width $list_height $tags \
+          --separate-output --notags 3>&1 1>&2 2>&3 3>&-)
+  res=$?
+
+  # Use res=${(f)"$(whiptail_checklist...)"} to ignore spaces
+  echo $tag
+  return $res
+}
+
+whiptail_menu() {
+  autoload zmathfunc; zmathfunc  # min, max, sum
+  eval $(resize)  # COLUMNS, LINES
+
+  local res title="$1" text="$2"
+  (( width=max(30, $#text) ))
+  shift 2
+
+  # Make tags compatible with whiptail
+  local -a tags
+  for tag; do
+    tags+=($tag $tag)
+    (( width=max(width, $#tag) ))
+  done
+
+  # Compute "best" width & height
+  (( menu_height=min(20, ${#*}, LINES * .5) ))
+  (( height=min(menu_height+8, LINES) ))
+  (( width=min(width + 5, COLUMNS * .75) ))
+
+  tag=$(whiptail --title $title \
+          --menu $text $height $width $menu_height $tags \
+          --notags 3>&1 1>&2 2>&3 3>&-)
   res=$?
 
   echo $tag