Fix METADATA generation for git dependencies with extras (#1129)

* fix METADATA generation for git dependencies with extras

* add comment

* add comment

* add comment and linting

* Move trailing space from `base_pep_508_name()` to `to_pep_508()`

* Merge remote-tracking branch 'origin/master'

# Conflicts:
#	tests/packages/test_vcs_dependency.py

* Make changes python2 compliant

* Handle any type of marker

* Insert space before semicolon in dependency.py if vcs

poetry/packages/dependency.py

@@ -200,6 +200,9 @@ class Dependency(object):
             )
 
         if markers:
+            if self.is_vcs():
+                requirement += " "
+
             if len(markers) > 1:
                 markers = ["({})".format(m) for m in markers]
                 requirement += "; {}".format(" and ".join(markers))

tests/packages/test_vcs_dependency.py

@@ -20,3 +20,36 @@ def test_to_pep_508_with_extras():
     expected = "poetry[foo] @ git+https://github.com/sdispater/poetry.git@master"
 
     assert expected == dependency.to_pep_508()
+
+
+def test_to_pep_508_in_extras():
+    dependency = VCSDependency(
+        "poetry", "git", "https://github.com/sdispater/poetry.git"
+    )
+    dependency.in_extras.append("foo")
+
+    expected = (
+        'poetry @ git+https://github.com/sdispater/poetry.git@master ; extra == "foo"'
+    )
+    assert expected == dependency.to_pep_508()
+
+    dependency = VCSDependency(
+        "poetry", "git", "https://github.com/sdispater/poetry.git"
+    )
+    dependency.in_extras.append("foo")
+    dependency.extras.append("bar")
+
+    expected = 'poetry[bar] @ git+https://github.com/sdispater/poetry.git@master ; extra == "foo"'
+
+    assert expected == dependency.to_pep_508()
+
+    dependency = VCSDependency(
+        "poetry", "git", "https://github.com/sdispater/poetry.git", "b;ar;"
+    )
+    dependency.in_extras.append("foo;")
+
+    expected = (
+        'poetry @ git+https://github.com/sdispater/poetry.git@b;ar; ; extra == "foo;"'
+    )
+
+    assert expected == dependency.to_pep_508()