Some improvements over init command

src/poetry/console/commands/init.py

@@ -118,12 +118,9 @@ def handle(self) -> int:
         )
         version = self.ask(question)
 
-        description = self.option("description") or ""
-        question = self.create_question(
-            f"Description [<comment>{description}</comment>]: ",
-            default=description,
-        )
-        description = self.ask(question)
+        description = self.option("description")
+        if not description:
+            description = self.ask(self.create_question("Description []: ", default=""))
 
         author = self.option("author")
         if not author and vcs_config.get("user.name"):
@@ -143,13 +140,9 @@ def handle(self) -> int:
         else:
             authors = [author]
 
-        license = self.option("license") or ""
-
-        question = self.create_question(
-            f"License [<comment>{license}</comment>]: ", default=license
-        )
-        question.set_validator(self._validate_license)
-        license = self.ask(question)
+        license = self.option("license")
+        if not license:
+            license = self.ask(self.create_question("License []: ", default=""))
 
         python = self.option("python")
         if not python:
@@ -175,7 +168,7 @@ def handle(self) -> int:
         question = "Would you like to define your main dependencies interactively?"
         help_message = """\
 You can specify a package in the following forms:
-  - A single name (<b>requests</b>)
+  - A single name (<b>requests</b>): this will search for matches on PyPI
   - A name and a constraint (<b>requests@^2.23.0</b>)
   - A git url (<b>git+https://github.com/python-poetry/poetry.git</b>)
   - A git url with a revision\
@@ -272,9 +265,12 @@ def _determine_requirements(
         if not requires:
             result = []
 
-            package = self.ask(
-                "Search for package to add (or leave blank to continue):"
+            question = self.create_question(
+                "Package to add or search for (leave blank to skip):"
             )
+            question.set_validator(self._validate_package)
+
+            package = self.ask(question)
             while package:
                 constraint = self._parse_requirements([package])[0]
                 if (
@@ -457,13 +453,12 @@ def _validate_author(self, author: str, default: str) -> str | None:
 
         return author
 
-    def _validate_license(self, license: str) -> str:
-        from poetry.core.spdx.helpers import license_by_id
-
-        if license:
-            license_by_id(license)
+    @staticmethod
+    def _validate_package(package: str | None) -> str | None:
+        if package and len(package.split()) > 2:
+            raise ValueError("Invalid package definition.")
 
-        return license
+        return package
 
     def _get_pool(self) -> Pool:
         from poetry.repositories import Pool

tests/console/commands/test_init.py

@@ -11,6 +11,7 @@
 
 from cleo.testers.command_tester import CommandTester
 
+from poetry.console.commands.init import InitCommand
 from poetry.repositories import Pool
 from poetry.utils._compat import decode
 from poetry.utils.helpers import canonicalize_name
@@ -587,6 +588,56 @@ def test_interactive_with_file_dependency(
     assert expected in tester.io.fetch_output()
 
 
+def test_interactive_with_wrong_dependency_inputs(
+    tester: CommandTester, repo: TestRepository
+):
+    repo.add_package(get_package("pendulum", "2.0.0"))
+    repo.add_package(get_package("pytest", "3.6.0"))
+
+    inputs = [
+        "my-package",  # Package name
+        "1.2.3",  # Version
+        "This is a description",  # Description
+        "n",  # Author
+        "MIT",  # License
+        "^3.8",  # Python
+        "",  # Interactive packages
+        "pendulum 2.0.0 foo",  # Package name and constraint (invalid)
+        "pendulum 2.0.0",  # Package name and constraint (invalid)
+        "pendulum 2.0.0",  # Package name and constraint (invalid)
+        "pendulum 2.0.0",  # Package name and constraint (invalid)
+        "pendulum@^2.0.0",  # Package name and constraint (valid)
+        "",  # End package selection
+        "",  # Interactive dev packages
+        "pytest 3.6.0 foo",  # Dev package name and constraint (invalid)
+        "pytest 3.6.0",  # Dev package name and constraint (invalid)
+        "pytest@3.6.0",  # Dev package name and constraint (valid)
+        "",  # End package selection
+        "\n",  # Generate
+    ]
+    tester.execute(inputs="\n".join(inputs))
+
+    expected = """\
+[tool.poetry]
+name = "my-package"
+version = "1.2.3"
+description = "This is a description"
+authors = ["Your Name <you@example.com>"]
+license = "MIT"
+readme = "README.md"
+packages = [{include = "my_package"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+pendulum = "^2.0.0"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "3.6.0"
+"""
+
+    assert expected in tester.io.fetch_output()
+
+
 def test_python_option(tester: CommandTester):
     inputs = [
         "my-package",  # Package name
@@ -779,6 +830,51 @@ def test_predefined_and_interactive_dev_dependencies(
     assert 'pytest = "^3.6.0"' in output
 
 
+def test_predefined_all_options(tester: CommandTester, repo: TestRepository):
+    repo.add_package(get_package("pendulum", "2.0.0"))
+    repo.add_package(get_package("pytest", "3.6.0"))
+
+    inputs = [
+        "1.2.3",  # Version
+        "",  # Author
+        "n",  # Interactive packages
+        "n",  # Interactive dev packages
+        "\n",  # Generate
+    ]
+
+    tester.execute(
+        "--name my-package "
+        "--description 'This is a description' "
+        "--author 'Foo Bar <foo@example.com>' "
+        "--python '^3.8' "
+        "--license MIT "
+        "--dependency pendulum "
+        "--dev-dependency pytest",
+        inputs="\n".join(inputs),
+    )
+
+    expected = """\
+[tool.poetry]
+name = "my-package"
+version = "1.2.3"
+description = "This is a description"
+authors = ["Foo Bar <foo@example.com>"]
+license = "MIT"
+readme = "README.md"
+packages = [{include = "my_package"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+pendulum = "^2.0.0"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^3.6.0"
+"""
+
+    output = tester.io.fetch_output()
+    assert expected in output
+
+
 def test_add_package_with_extras_and_whitespace(tester: CommandTester):
     result = tester.command._parse_requirements(["databases[postgresql, sqlite]"])
 
@@ -861,3 +957,29 @@ def test_init_existing_pyproject_with_build_system_fails(
         == "A pyproject.toml file with a defined build-system already exists."
     )
     assert existing_section in pyproject_file.read_text()
+
+
+@pytest.mark.parametrize(
+    "name",
+    [
+        None,
+        "",
+        "foo",
+        "   foo  ",
+        "foo==2.0",
+        "foo@2.0",
+        "  foo@2.0   ",
+        "foo 2.0",
+        "   foo 2.0  ",
+    ],
+)
+def test__validate_package_valid(name: str | None):
+    assert InitCommand._validate_package(name) == name
+
+
+@pytest.mark.parametrize(
+    "name", ["foo bar 2.0", "   foo bar 2.0   ", "foo bar foobar 2.0"]
+)
+def test__validate_package_invalid(name: str):
+    with pytest.raises(ValueError):
+        assert InitCommand._validate_package(name)