[WIP] Allow to manage project version with git tags

poetry/poetry.py

@@ -21,6 +21,7 @@
 from .utils._compat import Path
 from .utils.helpers import get_http_basic_auth
 from .utils.toml_file import TomlFile
+from .vcs.git import version_from_tags
 
 
 class Poetry:
@@ -107,7 +108,7 @@ def create(cls, cwd):  # type: (Path) -> Poetry
 
         # Load package
         name = local_config["name"]
-        version = local_config["version"]
+        version = local_config.get("version", version_from_tags())
         package = ProjectPackage(name, version, version)
         package.root_dir = poetry_file.parent
 

poetry/vcs/git.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import pkg_resources
 import re
 import subprocess
 
@@ -44,6 +45,9 @@ def config(self):  # type: () -> GitConfig
     def clone(self, repository, dest):  # type: (...) -> str
         return self.run("clone", repository, str(dest))
 
+    def tag(self):  # type: (...) -> list
+        return self.run("tag").split("\n")
+
     def checkout(self, rev, folder=None):  # type: (...) -> str
         args = []
         if folder is None and self._work_dir:
@@ -100,3 +104,14 @@ def run(self, *args):  # type: (...) -> str
         return decode(
             subprocess.check_output(["git"] + list(args), stderr=subprocess.STDOUT)
         )
+
+
+def version_from_tags():
+    from poetry.semver import Version
+
+    git = Git()
+    version = "0.0.0"
+    tags = git.tag()
+    if tags:
+        version = max(tags, key=pkg_resources.parse_version)
+    return Version.parse(version)