feat: Implement a goose run command (#121)

src/goose/cli/main.py

@@ -171,6 +171,22 @@ def session_resume(name: Optional[str], profile: str, log_level: str) -> None:
     session.run()
 
 
+@goose_cli.command(name="run")
+@click.argument("message_file", required=False, type=click.Path(exists=True))
+@click.option("--profile")
+@click.option("--log-level", type=click.Choice(["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]), default="INFO")
+def run(message_file: Optional[str], profile: str, log_level: str) -> None:
+    """Run a single-pass session with a message from a markdown input file"""
+    if message_file:
+        with open(message_file, "r") as f:
+            initial_message = f.read()
+    else:
+        initial_message = click.get_text_stream("stdin").read()
+
+    session = Session(profile=profile, log_level=log_level)
+    session.single_pass(initial_message=initial_message)
+
+
 @session.command(name="list")
 def session_list() -> None:
     """List goose sessions"""

src/goose/cli/session.py

@@ -121,6 +121,31 @@ class Session:
             return Message.user(text=user_input.text)
         return self.exchange.messages.pop()
 
+    def single_pass(self, initial_message: str) -> None:
+        """
+        Handles a single input message and processes a reply
+        without entering a loop for additional inputs.
+
+        Args:
+            initial_message (str): The initial user message to process.
+        """
+        profile = self.profile_name or "default"
+        print(f"[dim]starting session | name:[cyan]{self.name}[/]  profile:[cyan]{profile}[/]")
+        print(f"[dim]saving to {self.session_file_path}")
+        print()
+
+        # Process initial message
+        message = Message.user(initial_message)
+
+        self.exchange.add(message)
+        self.reply()  # Process the user message
+
+        save_latest_session(self.session_file_path, self.exchange.messages)
+        print()  # Print a newline for separation.
+
+        print(f"[dim]ended run | name:[cyan]{self.name}[/]  profile:[cyan]{profile}[/]")
+        print(f"[dim]to resume: [magenta]goose session resume {self.name} --profile {profile}[/][/]")
+
     def run(self) -> None:
         """
         Runs the main loop to handle user inputs and responses.