vary bad init code

src/main.rs

@@ -1,5 +1,13 @@
 use clap::{Parser, Subcommand};
 
+use std::fs;
+use std::io;
+use std::fmt;
+use std::path::Path;
+
+const STORAGE_PATH: &str = "storage";
+
+
 #[derive(Parser)]
 #[command(name = "mps", version = "0.0.1", about = "MyPasswordStorage: Tool for storing your passwords locally with synchronization with git.")]
 struct Cli {
@@ -21,17 +29,59 @@ enum Commands {
     
 }
 
-fn main() {
+enum RuntimeError {
+    Reinit,
+    BadInit
+}
+
+impl fmt::Display for RuntimeError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            RuntimeError::Reinit => write!(f, "Initialization can't be second time. Remove store folder if you want new inizilization"),
+            RuntimeError::BadInit => write!(f, "Can`t create storage folder")
+        }
+    }
+}
+
+impl From<RuntimeError> for std::io::Error {
+    fn from(err: RuntimeError) -> std::io::Error {
+        match err {
+            RuntimeError::Reinit => std::io::Error::new(std::io::ErrorKind::AlreadyExists, "Reinitialization attempted"),
+            RuntimeError::BadInit => std::io::Error::new(std::io::ErrorKind::Other, "Bad initialization"),
+        }
+    }
+}
+
+fn init() -> Result<(), RuntimeError> {
+    let path = Path::new(STORAGE_PATH);
+    if path.exists() {
+        return Err(RuntimeError::Reinit);
+    }
+
+    match fs::create_dir(STORAGE_PATH) {
+        Ok(_) => return Ok(()),
+        Err(_) => return Err(RuntimeError::BadInit),
+    }
+
+    Ok(())
+}
+
+fn main() -> io::Result<()> {
     let cli = Cli::parse();
     match &cli.command {
         Some(Commands::Init) => {
+            init().map_err(|e| match e {
+                RuntimeError::Reinit => std::io::Error::new(std::io::ErrorKind::AlreadyExists, "Reinitialization attempted"),
+                RuntimeError::BadInit => std::io::Error::new(std::io::ErrorKind::Other, "Bad initialization"),
+            })?;
             println!("Initializing storage and config.");
         }
-        Some(Commands::Add{input}) => {
+        Some(Commands::Add{..}) => {
             println!("about to add new item");
         }
         None => {
             println!("Will be here init or list if storage inited");
         }
     }
+    Ok(())
 }