[User] New module with user management

Signed-off-by: Slava Barinov <rayslava@gmail.com>

src/user.rs

@@ -0,0 +1,74 @@
+use crate::categories::CatStats;
+use pickledb::{PickleDb, PickleDbDumpPolicy, SerializationMethod};
+use radix_trie::Trie;
+use shellexpand::tilde;
+use std::path::PathBuf;
+use std::time::Duration;
+
+/// Configuration for single user
+pub struct User {
+    /// Categories statistics for the user
+    pub catmap: CatStats,
+
+    /// Available accounts for the user
+    pub accounts: Vec<String>,
+
+    /// database with config
+    db: PickleDb,
+}
+
+pub const DEFAULT_DB_PATH: &str = "~/.config/receqif/";
+
+impl Drop for User {
+    fn drop(&mut self) {
+        self.db.set("catmap", &self.catmap).unwrap();
+        self.db.dump().unwrap();
+    }
+}
+
+impl User {
+    pub fn new(uid: i128, dbfile: &Option<String>) -> Self {
+        let ten_sec = Duration::from_secs(10);
+        let path: String = match dbfile {
+            Some(path) => path.to_string(),
+            None => DEFAULT_DB_PATH.to_owned() + &uid.to_string() + ".db",
+        };
+        let confpath: &str = &tilde(&path);
+        let confpath = PathBuf::from(confpath);
+
+        let dbase = PickleDb::load(
+            &confpath,
+            PickleDbDumpPolicy::PeriodicDump(ten_sec),
+            SerializationMethod::Json,
+        );
+
+        let db = match dbase {
+            Ok(db) => db,
+            Err(_) => PickleDb::new(
+                &confpath,
+                PickleDbDumpPolicy::PeriodicDump(ten_sec),
+                SerializationMethod::Json,
+            ),
+        };
+
+        let catmap: CatStats = match db.get("catmap") {
+            Some(v) => v,
+            None => Trie::new(),
+        };
+
+        let accounts = match db.get("accounts") {
+            Some(a) => a,
+            None => vec![],
+        };
+
+        User {
+            catmap,
+            accounts,
+            db,
+        }
+    }
+
+    pub fn accounts(&mut self, acc: Vec<String>) {
+        self.accounts = acc;
+    }
+}