feat(cli): add clap and small cli structure

crates/mms/Cargo.toml

@@ -6,6 +6,7 @@ edition.workspace = true
 authors.workspace = true
 description.workspace = true
 documentation.workspace = true
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.5.8", features = ["derive"] }
+mms_tui = { path = "../mms_tui" }

crates/mms/src/main.rs

@@ -1,3 +1,52 @@
+use std::path::PathBuf;
+
+use clap::{Parser, Subcommand};
+use mms_tui::MMSTuiApplication;
+
+#[derive(Parser)]
+#[command(version, about, long_about = None, bin_name = "mms")]
+struct Cli {
+    /// Sets a custom config file
+    #[arg(short, long, value_name = "FILE")]
+    config: Option<PathBuf>,
+
+    /// Turn verbose logging on
+    #[arg(short, long, action = clap::ArgAction::Count)]
+    verbose: u8,
+
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    UI {},
+}
+
 fn main() {
-    println!("Hello, world!");
+    let cli = Cli::parse();
+
+    if let Some(config_path) = cli.config.as_deref() {
+        println!("Value for config: {}", config_path.display());
+    }
+
+    // You can see how many times a particular flag or argument occurred
+    // Note, only flags can have multiple occurrences
+    match cli.verbose {
+        0 => println!("Debug mode is off"),
+        1 => println!("Debug mode is kind of on"),
+        2 => println!("Debug mode is on"),
+        _ => println!("Don't be crazy"),
+    }
+
+    // You can check for the existence of subcommands, and if found use their
+    // matches just as you would the top level cmd
+    match &cli.command {
+        Some(Commands::UI {}) => {
+            println!("start terminal ui");
+            let tui = MMSTuiApplication::new().expect("default mms tui application");
+            println!("{:?}", tui)
+        }
+        None => {}
+    }
 }

crates/mms_tui/src/lib.rs

@@ -1,6 +1,8 @@
+#[derive(Debug)]
 pub struct MMSTuiApplication {}
+
 impl MMSTuiApplication {
-    fn new() -> Result<MMSTuiApplication, ()> {
+    pub fn new() -> Result<MMSTuiApplication, ()> {
         Ok(MMSTuiApplication {})
     }
 }