Launch clide in separate process by default.

Improve CLI to support tui and gui modes.
Also supports attaching the GUI to the current terminal via -g

src/main.rs

@@ -2,6 +2,7 @@
 
 use cxx_qt_lib::QString;
 use std::error::Error;
+use std::process::{Command, Stdio};
 use structopt::StructOpt;
 
 pub mod colors;
@@ -34,16 +35,23 @@ fn run_tui(root_path: std::path::PathBuf) -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+/// Command line interface IDE with full GUI and headless modes.
+/// If no flags are provided the GUI editor is launched in a separate process.
+/// If no path is provided the current directory is used.
 #[derive(StructOpt, Debug)]
-#[structopt(name = "clide")]
+#[structopt(name = "clide", verbatim_doc_comment)]
 struct Cli {
-    /// The root path to open with the clide editor.
+    /// The root directory for the project to open with the clide editor.
     #[structopt(parse(from_os_str))]
     pub path: Option<std::path::PathBuf>,
 
-    /// Run in headless mode if this flag is present.
+    /// Run clide in headless mode.
     #[structopt(name = "tui", short, long)]
     pub tui: bool,
+
+    /// Run the clide GUI in the current process, blocking the terminal and showing all output streams.
+    #[structopt(name = "gui", short, long)]
+    pub gui: bool,
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
@@ -58,9 +66,23 @@ fn main() -> Result<(), Box<dyn Error>> {
                 dirs::home_dir().expect("Failed to access filesystem.")),
     };
 
+    match args.gui {
+        true => run_gui(root_path),
+        false => {
             // Open the TUI editor if requested, otherwise use the QML GUI by default.
             match args.tui {
                 true => run_tui(root_path),
-        false => run_gui(root_path),
+                false => {
+                    // Relaunch the CLIDE GUI in a separate process.
+                    Command::new(std::env::current_exe()?)
+                        .args(&["--gui"])
+                        .stdout(Stdio::null())
+                        .stderr(Stdio::null())
+                        .stdin(Stdio::null())
+                        .spawn()?;
+                    Ok(())
+                }
+            }
+        }
     }
 }