added opener script support

README.txt

@@ -87,11 +87,34 @@ Press P to toggle the preview pane on the right side of the screen.
 The list pane takes the left half, preview takes the right half.
  
   Text files      Shows file contents line by line
-  Directories     Shows entry count
+  Directories     Shows directory contents
   Symlinks        Shows link target
   Binary files    Shows file size
  
  
+CUSTOM OPENER
+-------------
+sfm checks for a user-defined opener script at:
+ 
+  ~/.config/sfm/opener
+ 
+If the file exists and is executable, sfm passes the selected file
+path to it instead of using the built-in smart opener. Example:
+ 
+  #!/bin/sh
+  case "$1" in
+      *.jpg|*.jpeg) imv "$1" ;;
+      *.mp4)        mpv "$1" ;;
+      *.html|*.pdf) firefox "$1" ;;
+      *)            echo "no program set for this file type" ;;
+  esac
+ 
+Make it executable: chmod +x ~/.config/sfm/opener
+ 
+If the opener script does not exist, sfm falls back to its built-in
+smart opener automatically.
+ 
+ 
 FILE OPERATIONS
 ---------------
   r       Rename selected entry
@@ -182,4 +205,6 @@ it back to the desired location.
 DATA FILES
 ----------
   ~/.config/sfm/bookmarks     Saved bookmarks (one path per line)
+  ~/.config/sfm/opener        Custom file opener script (optional)
   ~/.local/share/sfm-trash/   Trashed files
+ 

sfm

@@ -679,6 +679,14 @@ _run_gui() { "$@" >/dev/null 2>&1 & }
 
 open_file() {
     _f="$1"
+
+    # use user opener script if it exists and is executable
+    _opener="${XDG_CONFIG_HOME:-$HOME/.config}/sfm/opener"
+    if [ -x "$_opener" ]; then
+        "$_opener" "$_f"
+        return
+    fi
+
     _ext="${_f##*.}"
     _ext=$(printf '%s' "$_ext" | tr '[:upper:]' '[:lower:]')