From aa04d6370bcd2745252bf82b9e7cbdef2c98a1d5 Mon Sep 17 00:00:00 2001
From: Luuk van Baal <luukvbaal@gmail.com>
Date: Sun, 15 Sep 2024 16:04:37 +0200
Subject: [PATCH] change and document variable expansion

---
 plugins/preview-tui | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/plugins/preview-tui b/plugins/preview-tui
index 80597f34..45177fdb 100755
--- a/plugins/preview-tui
+++ b/plugins/preview-tui
@@ -112,7 +112,7 @@ ENVVARS=(
   "NNN_PREVIEWWIDTH=${NNN_PREVIEWWIDTH:-1920}"             # width of generated preview images
   "NNN_PREVIEWHEIGHT=${NNN_PREVIEWHEIGHT:-1080}"           # height of generated preview images
   "NNN_PREVIEWDIR=${NNN_PREVIEWDIR:-$TMPDIR/nnn/previews}" # location of generated preview images
-  "NNN_PREVIEWIMGPROG=${NNN_PREVIEWIMGPROG:-}"             # program used to preview images
+  "NNN_PREVIEWIMGPROG=${NNN_PREVIEWIMGPROG:-}"             # command used to preview images
   "NNN_PREVIEWVIDEO=${NNN_PREVIEWVIDEO:-}"                 # mpv backend used to preview video
 )
 # Non-configurable environment variables
@@ -131,7 +131,7 @@ ENVVARS+=(
 )
 
 trap '' PIPE
-exists() { type "${1%% *}" >/dev/null 2>&1 ;}
+exists() { type "$1" >/dev/null 2>&1 ;}
 pkill() { command pkill "$@" >/dev/null 2>&1 ;}
 prompt() { clear; printf "%b" "$@"; cfg=$(stty -g); stty raw -echo; head -c 1; stty "$cfg" ;}
 pidkill() {
@@ -452,7 +452,7 @@ image_preview() {
         wezterm imgcat "$3" &
     elif exists ueberzug && [[ "$NNN_PREVIEWIMGPROG" == +(|ueberzug) ]]; then
         ueberzug_layer "$1" "$2" "$3" && return
-    elif exists "$NNN_PREVIEWIMGPROG"; then
+    elif exists "${NNN_PREVIEWIMGPROG%% *}"; then # can include command flags; only check first word
         "$NNN_PREVIEWIMGPROG" "$3" &
     else
         fifo_pager print_bin_info "$3" && return