Added functionality to format the version based on git tags with foll…

…owing commits and hashes

Primarily meant for autobuilding commits

README.md

@@ -112,6 +112,49 @@ Building my-awesome-package (0.1.3)
   - Built my-awesome-package-0.1.3-py3-none-any.whl
 ```
 
+### Set the version in a Git tag and add commits and hash
+
+Another alternative , to extract the version to use from a Git tag, but also add commits and hashes when there have been commits since the last tag.
+Add a section:
+
+```toml
+[tool.poetry-version-plugin]
+source = "git-tag-plus-hash"
+```
+
+Then create a git tag, for example:
+
+```console
+$ git tag 0.1.3
+```
+
+In this case, when building your project, it will show an output like:
+
+```console
+$ poetry build
+Git tag found, setting dynamic version to: 0.1.3
+Building my-awesome-package (0.1.3)
+  - Building sdist
+  - Built my-awesome-package-0.1.3.tar.gz
+  - Building wheel
+  - Built my-awesome-package-0.1.3-py3-none-any.whl
+```
+
+But, if there has been a git commit after the last tag, the output will be like:
+
+```console
+$ poetry build
+Git tag plus hash found, setting dynamic version to: 0.1.3+0.76cdb16a
+Building my-awesome-package (0.1.3+0.76cdb16a)
+  - Building sdist
+  - Built my-awesome-package-0.1.3+0.76cdb16a.tar.gz
+  - Building wheel
+  - Built my-awesome-package-0.1.3+0.76cdb16a-py3-none-any.whl
+```
+
+This can be useful for autobuilding commits.
+
+
 ## Version in `pyproject.toml`
 
 Currently (2021-05-24) Poetry requires a `version` configuration in the `pyproject.toml`, even if you use this plugin.
@@ -349,6 +392,13 @@ and
 source = "git-tag"
 ```
 
+and
+
+```toml
+[tool.poetry-version-plugin]
+source = "git-tag-plus-hash"
+```
+
 let me know what alternative configuration would make more sense and be more intuitive to you.
 
 👍 The good news is, assuming you are building packages to then upload them to PyPI for your users to download and use them, the **worst that could happen** if something broke is that you wouldn't be able to build a new version until something is fixed or changed. But your users shouldn't be affected in any way.

poetry_version_plugin/plugin.py

@@ -104,3 +104,54 @@ def activate(self, poetry: Poetry, io: IO) -> None:
                 )
                 io.write_error_line(message)
                 raise RuntimeError(message)
+        elif version_source == "git-tag-plus-hash":
+            result = subprocess.run(
+                ["git", "describe", "--exact-match", "--tags", "HEAD"],
+                stdin=subprocess.PIPE,
+                stdout=subprocess.PIPE,
+                universal_newlines=True,
+            )
+            if result.returncode == 0:
+                tag = result.stdout.strip()
+                io.write_line(
+                    "<b>poetry-version-plugin</b>: Git tag found, setting "
+                    f"dynamic version to: {tag}"
+                )
+                poetry.package._set_version(tag)
+                return
+            else:
+                result = subprocess.run(
+                    ["git", "describe", "--tags", "--abbrev=0"],
+                    stdin=subprocess.PIPE,
+                    stdout=subprocess.PIPE,
+                    universal_newlines=True,
+                )
+                if result.returncode == 0:
+                    tag = result.stdout.strip()
+                    result = subprocess.run(
+                        ["git", "rev-parse", "--short=8", "HEAD"],
+                        stdin=subprocess.PIPE,
+                        stdout=subprocess.PIPE,
+                        universal_newlines=True,
+                    )
+                    hash = result.stdout.strip()
+                    result = subprocess.run(
+                        ["git", "rev-list", hash+"..HEAD", "--count"],
+                        stdin=subprocess.PIPE,
+                        stdout=subprocess.PIPE,
+                        universal_newlines=True,
+                    )
+                    commits = result.stdout.strip()
+                    io.write_line(
+                        "<b>poetry-version-plugin</b>: Git tag plus hash found, setting "
+                        f"dynamic version to: {tag}+{commits}.{hash}"
+                    )
+                    poetry.package._set_version(tag+"+"+commits+"."+hash)
+                    return
+                else:
+                    message = (
+                       "<b>poetry-version-plugin</b>: No Git tag found, not "
+                       "extracting dynamic version"
+                    )
+                    io.write_error_line(message)
+                    raise RuntimeError(message)