Improve the @@ command to include cycling

Courtesy gemini.

alex/fish/functions/latest-file.fish

@@ -1,20 +1,51 @@
 function bind_at
+	# 1. Get the list of files (Sorted by time, newest first)
+	#	 -p adds '/' to dirs so we can filter them out with grep -v
+	set -l files (command ls -tAp | string match -v '*/')
+
+	# 2. Get the current token on the command line
 	set -l token (commandline -t)
-	if string match -q -- "*@" "$token"
-		commandline -f backward-delete-char
-		set -l newest_file
-		for f in (command ls -tA)
-			if test -f "$f"
-				set newest_file "$f"
-				break
-			end
+
+	# --- CYCLE MODE ---
+	# Check if the current token matches a file in our list.
+	# If it does, we assume you're hitting @ again to "scroll" back in time.
+	set -l found_index 0
+	for i in (seq (count $files))
+		# We compare against the escaped version because that's what sits on the command line
+		if test "$token" = (string escape -- $files[$i])
+			set found_index $i
+			break
 		end
-		if test -n "$newest_file"
-			commandline -i (string escape -- "$newest_file")
-		else
-			commandline -i "@"
-		end
-	else
-		commandline -i "@"
 	end
+
+	if test $found_index -gt 0
+		# Found it! Calculate the next index (wrapping around if needed)
+		set -l next_index (math $found_index + 1)
+		if test $next_index -gt (count $files)
+			set next_index 1
+		end
+
+		# Replace the current token with the next file
+		set -l next_file (string escape -- $files[$next_index])
+		commandline -t -- $next_file
+		return
+	end
+
+	# --- TRIGGER MODE (@@) ---
+	# If it wasn't a file, check if we just finished typing "@@"
+	if string match -q -- "*@" "$token"
+		commandline -f backward-delete-char # Delete the last @
+
+		# Insert the very first (newest) file
+		if test (count $files) -gt 0
+			commandline -i (string escape -- $files[1])
+		else
+			commandline -i "@" # No files? fallback
+		end
+		return
+	end
+
+	# --- DEFAULT MODE ---
+	# Just insert an @ literally
+	commandline -i "@"
 end