handle poetry init non-interactive dependencies (python-poetry#2899)

* handle poetry init non-interactive dependencies

1. in non-interactive mode, suppress "This command will guide you through..."
2. in interactive mode, respect command line --dependency if the user chooses NO for "Would you like to define your main dependencies interactively?"

poetry/console/commands/init.py

@@ -86,11 +86,12 @@ def handle(self) -> int:
 
         vcs_config = GitConfig()
 
-        self.line("")
-        self.line(
-            "This command will guide you through creating your <info>pyproject.toml</> config."
-        )
-        self.line("")
+        if self.io.is_interactive():
+            self.line("")
+            self.line(
+                "This command will guide you through creating your <info>pyproject.toml</> config."
+            )
+            self.line("")
 
         name = self.option("name")
         if not name:
@@ -154,7 +155,8 @@ def handle(self) -> int:
             )
             python = self.ask(question)
 
-        self.line("")
+        if self.io.is_interactive():
+            self.line("")
 
         requirements = {}
         if self.option("dependency"):
@@ -175,12 +177,14 @@ def handle(self) -> int:
         )
         help_displayed = False
         if self.confirm(question, True):
-            self.line(help_message)
-            help_displayed = True
+            if self.io.is_interactive():
+                self.line(help_message)
+                help_displayed = True
             requirements.update(
                 self._format_requirements(self._determine_requirements([]))
             )
-            self.line("")
+            if self.io.is_interactive():
+                self.line("")
 
         dev_requirements = {}
         if self.option("dev-dependency"):
@@ -192,13 +196,14 @@ def handle(self) -> int:
             "Would you like to define your development dependencies interactively?"
         )
         if self.confirm(question, True):
-            if not help_displayed:
+            if self.io.is_interactive() and not help_displayed:
                 self.line(help_message)
 
             dev_requirements.update(
                 self._format_requirements(self._determine_requirements([]))
             )
-            self.line("")
+            if self.io.is_interactive():
+                self.line("")
 
         layout_ = layout("standard")(
             name,
@@ -317,7 +322,8 @@ def _determine_requirements(
                 if package is not False:
                     requires.append(constraint)
 
-                package = self.ask("\nAdd a package:")
+                if self.io.is_interactive():
+                    package = self.ask("\nAdd a package:")
 
             return requires
 

tests/console/commands/test_init.py

@@ -81,6 +81,28 @@ def test_basic_interactive(tester, init_basic_inputs, init_basic_toml):
     assert init_basic_toml in tester.io.fetch_output()
 
 
+def test_noninteractive(app, mocker, poetry, repo, tmp_path):
+    command = app.find("init")
+    command._pool = poetry.pool
+
+    repo.add_package(get_package("pytest", "3.6.0"))
+
+    p = mocker.patch("poetry.utils._compat.Path.cwd")
+    p.return_value = tmp_path
+
+    tester = CommandTester(command)
+    args = "--name my-package --dependency pytest"
+    tester.execute(args=args, interactive=False)
+
+    expected = "Using version ^3.6.0 for pytest\n"
+    assert tester.io.fetch_output() == expected
+    assert "" == tester.io.fetch_error()
+
+    toml_content = (tmp_path / "pyproject.toml").read_text()
+    assert 'name = "my-package"' in toml_content
+    assert 'pytest = "^3.6.0"' in toml_content
+
+
 def test_interactive_with_dependencies(tester, repo):
     repo.add_package(get_package("django-pendulum", "0.1.6-pre4"))
     repo.add_package(get_package("pendulum", "2.0.0"))