Add support for changing namespaces by selecting them from a list. Does not yet support creating new namespaces.

src/db.rs

@@ -4,6 +4,7 @@ use rusqlite::{params, Connection};
 use rustc_serialize::base64;
 use rustc_serialize::base64::{FromBase64, ToBase64};
 use std::error::Error;
+use std::fmt;
 use std::path::PathBuf;
 
 static DB_INIT_QUERY: &'static str = include_str!("init.sql");
@@ -23,6 +24,11 @@ pub struct DbNamespace {
     pub name: EncryptedValue,
 }
 
+pub struct Namespace {
+    pub id: i64,
+    pub name: String,
+}
+
 pub struct DbNote {
     pub id: i64,
     pub namespace: DbNamespace,
@@ -146,13 +152,37 @@ impl DbHandle {
                     title: note.title.decrypt_to_string(master_key).unwrap(),
                     value: note.value.decrypt_to_string(master_key).unwrap(),
                 }),
-                Err(e) => return Err(e),
+                Err(e) => Err(e),
             })
             .collect();
 
         notes
     }
 
+    pub fn list_namespaces(&mut self, master_key: [u8; 32]) -> rusqlite::Result<Vec<Namespace>> {
+        let mut stmt = self
+            .conn
+            .prepare("SELECT id, name FROM namespaces")
+            .unwrap();
+        let rows = stmt.query_map(params![], |row| {
+            Ok(DbNamespace {
+                id: row.get(0)?,
+                name: row.get(1)?,
+            })
+        })?;
+
+        let namespaces: Result<Vec<Namespace>, _> = rows
+            .map(|namespace_result| match namespace_result {
+                Ok(namespace) => Ok(Namespace {
+                    id: namespace.id,
+                    name: namespace.name.decrypt_to_string(master_key).unwrap(),
+                }),
+                Err(e) => Err(e),
+            })
+            .collect();
+        namespaces
+    }
+
     pub fn get_db_property(&self, name: &str) -> Result<Option<String>, Box<dyn Error>> {
         let mut stmt = self
             .conn
@@ -190,3 +220,9 @@ impl DbHandle {
         self.set_db_property(name, &b64value);
     }
 }
+
+impl fmt::Display for Namespace {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.name)
+    }
+}

src/main.rs

@@ -1,3 +1,5 @@
+#![warn(clippy::all)]
+
 use crypto::hmac::Hmac;
 use crypto::mac::{Mac, MacResult};
 use crypto::sha2::Sha256;
@@ -168,21 +170,38 @@ fn shell_generate() {
     generate::generate(&spec);
 }
 
-fn shell(db_conn: &mut db::DbHandle, master_key: [u8; 32], namespace: &str) {
+fn change_namespace(db_conn: &mut db::DbHandle, master_key: [u8; 32]) -> String {
+    let namespaces = db_conn.list_namespaces(master_key).unwrap();
+    let selection = Select::with_theme(&ColorfulTheme::default())
+        .with_prompt("Change Namespace")
+        .default(0)
+        .items(&namespaces[..])
+        .interact()
+        .unwrap();
+    namespaces[selection].name.to_owned()
+}
+
+fn shell(db_conn: &mut db::DbHandle, master_key: [u8; 32], _namespace: &str) {
+    let mut namespace: String = _namespace.to_owned();
+
     loop {
-        let selections = &["get", "list", "set", "generate", "exit"];
+        let selections = &["get", "list", "set", "generate", "change namespace", "exit"];
+        let main_menu_prompt = format!("Main Menu ({})", namespace);
 
         let selection = Select::with_theme(&ColorfulTheme::default())
-            .with_prompt("Main Menu")
+            .with_prompt(&main_menu_prompt)
             .default(0)
             .items(&selections[..])
             .interact()
             .unwrap();
         match selections[selection] {
-            "get" => get(db_conn, master_key, namespace),
-            "list" => list(db_conn, master_key, namespace),
-            "set" => set(db_conn, master_key, namespace),
+            "get" => get(db_conn, master_key, &namespace),
+            "list" => list(db_conn, master_key, &namespace),
+            "set" => set(db_conn, master_key, &namespace),
             "generate" => shell_generate(),
+            "change namespace" => {
+                namespace = change_namespace(db_conn, master_key);
+            }
             "exit" => break,
             _ => panic!("Unrecognized command"),
         };