feat: error handling when duplicate service

app/main.py

@@ -49,6 +49,7 @@ def save(
         numbers=numbers,
     )
 
+    try:
         password = pass_gen.generate_password(sqlite_repo, options)
 
         typer.echo(typer.style(f"🔐 {password}", fg=typer.colors.GREEN, bold=True))
@@ -58,11 +59,16 @@ def save(
             return typer.echo(f"The password has been saved to: {file} 🗄")
 
         utils.copy_to_clipboard(password)
-    return typer.echo("The password has been copied to your clipboard 😉\nPaste it using cmd + v")
+        return typer.echo(
+            "The password has been copied to your clipboard 😉\nPaste it using cmd + v"
+        )
+    except ValueError as error:
+        typer.echo(f"error: {error}", err=True)
 
 
 @app.command()
 def read() -> None:
     sqlite_repo = sqlite.get_instance()
-    stored_passwords = sqlite_repo.list_all()
-    typer.echo([f"{p.service}: {p.password.get_secret_value()}" for p in stored_passwords])
+    stored_passwords = pass_gen.list_all_saved_passwords(sqlite_repo)
+    for p in stored_passwords:
+        typer.echo(f"{p.service}: {p.password.get_secret_value()}")

app/repositories/fake.py

@@ -15,6 +15,9 @@ class FakeRepository:
             Password(id=1, service="second", password=SecretStr("iK2ZWeqh")),
         ]
 
+    def exists(self, service: str) -> bool:
+        return False
+
     @classmethod
     def get_instance(cls) -> FakeRepository:
         return FakeRepository()

app/repositories/sqlite.py

@@ -21,9 +21,17 @@ class PasswordRepository:
     def list_all(self) -> list[Password]:
         return [
             Password(id=row[0], service=row[1], password=row[2])
-            for row in self.db.execute("SELECT * FROM " "passwords").fetchall()
+            for row in self.db.execute("SELECT * FROM passwords").fetchall()
         ]
 
+    def exists(self, service: str) -> bool:
+        row = self.db.execute(
+            "SELECT EXISTS(SELECT 1 FROM passwords WHERE service=:service)",
+            {"service": service},
+        ).fetchone()
+
+        return bool(row[0])
+
 
 def get_instance() -> PasswordRepository:
     db = sqlite.DB()

app/repositories/type.py

@@ -9,3 +9,6 @@ class Repository(Protocol):
 
     def list_all(self) -> list[Password]:
         ...
+
+    def exists(self, service: str) -> bool:
+        ...

app/usecases/pass_gen.py

@@ -17,6 +17,9 @@ class PassGenOptions(BaseModel):
 
 
 def generate_password(repo: Repository, options: PassGenOptions) -> str:
+    if repo.exists(options.service):
+        raise ValueError("password for this service has already been set")
+
     characters = _build_characters(symbols=options.symbols, numbers=options.numbers)
     random_generator = _new_random_generator(options.seed)
     password = "".join(random_generator.sample(characters, options.length))