basic add

src/main.rs

@@ -1,7 +1,7 @@
 use clap::{Parser, Subcommand};
 
 use std::fs;
-use std::io;
+use std::io::{self, Write};
 use std::path::Path;
 
 
@@ -9,7 +9,6 @@ const STORAGE_FOLDER: &str = "storage";
 const STORAGE_PATH: &str = "storage/db.mps"; // TODO: concat from STORAGE_FOLDER
 
 
-
 #[derive(Parser)]
 #[command(name = "mps", version = "0.0.1", about = "MyPasswordStorage: Tool for storing your passwords locally with git synchronization")]
 struct Cli {
@@ -59,6 +58,21 @@ fn init() -> io::Result<()> {
     Ok(())
 }
 
+fn add() -> io::Result<()> {
+    let mut file = match fs::OpenOptions::new()
+        .write(true)
+        .open(STORAGE_PATH)
+        {
+            Ok(file) => file,
+            Err(_) => {
+                return Err(io::Error::new(io::ErrorKind::Other, "can`t open database")); // TODO: better error handling
+            }
+        };
+
+    writeln!(file, "new item")?;
+    Ok(())
+}
+
 fn main() -> io::Result<()> {
     let cli = Cli::parse();
     match &cli.command {
@@ -67,7 +81,7 @@ fn main() -> io::Result<()> {
             println!("Initialization complete");
         }
         Some(Commands::Add{..}) => {
-            println!("about to add new item");
+            add()?;
         }
         None => {
             if !is_inited() {