handle poetry init non-interactive dependencies (#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

@@ -86,6 +86,7 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
 
         vcs_config = GitConfig()
 
+        if self.io.is_interactive():
             self.line("")
             self.line(
                 "This command will guide you through creating your <info>pyproject.toml</> config."
@@ -154,6 +155,7 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
             )
             python = self.ask(question)
 
+        if self.io.is_interactive():
             self.line("")
 
         requirements = {}
@@ -175,11 +177,13 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
         )
         help_displayed = False
         if self.confirm(question, True):
+            if self.io.is_interactive():
                 self.line(help_message)
                 help_displayed = True
             requirements.update(
                 self._format_requirements(self._determine_requirements([]))
             )
+            if self.io.is_interactive():
                 self.line("")
 
         dev_requirements = {}
@@ -192,12 +196,13 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
             "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([]))
             )
+            if self.io.is_interactive():
                 self.line("")
 
         layout_ = layout("standard")(
@@ -317,6 +322,7 @@ The <c1>init</c1> command creates a basic <comment>pyproject.toml</> file in the
                 if package is not False:
                     requires.append(constraint)
 
+                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"))