feat: Init 'init' command

- For creating configuration file (.gazer.toml)

Author: attakei

src/commands.rs

@@ -1 +1,2 @@
+pub mod init;
 pub mod version;

src/commands/init.rs

@@ -0,0 +1,24 @@
+use std::{env::current_dir, path::Path, result::Result};
+
+const DEFAULT_CONFIG_FILE: &'static str = ".gazer.toml";
+
+pub fn run() -> Result<(), &'static str> {
+    // TODO: Right way?
+    let target = current_dir()
+        .expect("Failed current directory")
+        .join(Path::new(DEFAULT_CONFIG_FILE));
+
+    {
+        // TODO: Right way?
+        let target = target.as_os_str().to_str().expect("Failure");
+        println!("{target}");
+    }
+
+    if target.exists() {
+        println!("Config file is already exists.");
+    } else {
+        // Generate config file.
+    }
+
+    Ok(())
+}

src/main.rs

@@ -15,6 +15,8 @@ struct Cli {
 enum Commands {
     /// Display version information
     Version {},
+    /// Create configuration file.
+    Init {},
 }
 
 fn main() {
@@ -23,6 +25,9 @@ fn main() {
         Some(Commands::Version {}) => {
             commands::version::run();
         }
+        Some(Commands::Init {}) => {
+            commands::init::run().expect("Command is failed");
+        }
         None => {}
     }
 }