refactor: continue simplifying entrypoint

src/main.rs

@@ -36,12 +36,20 @@ use ui::view_panel::ViewPanel;
 
 struct CmdLineArgs {
     file_path: Option<PathBuf>,
-    headless_cmds: Vec<String>,
-    headless_script: Option<PathBuf>,
     import_path: Option<PathBuf>,
 }
 
-fn parse_args(args: Vec<String>) -> Option<CmdLineArgs> {
+enum ArgConfig {
+    Help,
+    Headless {
+        file_path: Option<PathBuf>,
+        commands: Vec<String>,
+        script: Option<PathBuf>,
+    },
+    Default(CmdLineArgs),
+}
+
+fn parse_args(args: Vec<String>) -> ArgConfig {
     let mut file_path: Option<PathBuf> = None;
     let mut headless_cmds: Vec<String> = Vec::new();
     let mut headless_script: Option<PathBuf> = None;
@@ -65,8 +73,7 @@ fn parse_args(args: Vec<String>) -> Option<CmdLineArgs> {
                 import_path = args.get(i).map(PathBuf::from);
             }
             "--help" | "-h" => {
-                print_usage();
-                return None;
+                return ArgConfig::Help;
             }
             arg if !arg.starts_with('-') => {
                 file_path = Some(PathBuf::from(arg));
@@ -76,10 +83,16 @@ fn parse_args(args: Vec<String>) -> Option<CmdLineArgs> {
         i += 1;
     }
 
-    return Some(CmdLineArgs {
+    if !headless_cmds.is_empty() || headless_script.is_some() {
+        return ArgConfig::Headless {
+            file_path,
+            commands: headless_cmds,
+            script: headless_script,
+        };
+    }
+
+    return ArgConfig::Default(CmdLineArgs {
         file_path,
-        headless_cmds,
-        headless_script,
         import_path,
     });
 }
@@ -107,24 +120,12 @@ fn get_initial_model(file_path: &Option<PathBuf>) -> Result<Model> {
 fn main() -> Result<()> {
     let args: Vec<String> = std::env::args().collect();
 
-    let cmd_line_args = if let Some(args) = parse_args(args) {
-        args
-    } else {
-        return Ok(());
-    };
+    let arg_config = parse_args(args);
 
+    match arg_config {
+        ArgConfig::Default(cmd_line_args) => {
             // Load or create model
-    let mut model = get_initial_model(&cmd_line_args.file_path)?;
-
-    // Headless mode
-    if !cmd_line_args.headless_cmds.is_empty() || cmd_line_args.headless_script.is_some() {
-        return run_headless(
-            &mut model,
-            cmd_line_args.file_path,
-            cmd_line_args.headless_cmds,
-            cmd_line_args.headless_script,
-        );
-    }
+            let model = get_initial_model(&cmd_line_args.file_path)?;
 
             // Pre-TUI import: parse JSON and open wizard
             let import_json = if let Some(ref path) = cmd_line_args.import_path {
@@ -146,6 +147,20 @@ fn main() -> Result<()> {
             };
 
             run_tui(model, cmd_line_args.file_path, import_json)
+        }
+        ArgConfig::Headless {
+            file_path,
+            commands,
+            script,
+        } => {
+            let mut model = get_initial_model(&file_path)?;
+            return run_headless(&mut model, file_path, commands, script);
+        }
+        ArgConfig::Help => {
+            print_usage();
+            Ok(())
+        }
+    }
 }
 
 fn run_headless(