feat: use .tool-versions file if available (#9)

Author: aaronsteers

README.md

@@ -60,6 +60,17 @@ If the comment body is `/poe lint`, the action will run `poe lint`.
 - The action sets up Python 3.11 and installs dependencies using [uv](https://github.com/astral-sh/uv).
 - Your project should have a poe task named `install` which will run before any other requested command.
 - The `github-token` input is required for committing changes and posting comments.
+- Optional: If a `.tool-versions` file exists in the root of your repository, this action will automatically use it to determine the versions of `poetry`, `python`, and `uv`, provided matching entries are found. (See below.)
+
+## Tool Versions
+
+This action will attempt to use a `.tool-versions` file in your repo, if one esists. This behavior is powered by the [marocchino/tool-versions-action](https://github.com/marocchino/tool-versions-action). No additional configuration is required to enable this feature.
+
+If a `.tool-versions` file does not exist, or doesn't have versions specified, we will try with the following defaults:
+
+- `uv` - Default to latest version.
+- `poetry` - Default to latest version.
+- `python` - Default to version 3.11.
 
 ## Sample Workflows
 

action.yml

@@ -116,23 +116,36 @@ runs:
         repository: ${{ steps.pr-info.outputs.repo }}
         token: ${{ inputs.github-token }}
 
+    - name: Fetch tool versions
+      id: tool-versions
+      continue-on-error: true
+      uses: marocchino/tool-versions-action@v1
+
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        # Use the provided Python version or the default one
+        python-version: ${{ steps.tool-versions.outputs.python || '3.11' }}
 
     - name: Install uv
       uses: astral-sh/setup-uv@v5
       with:
-        python-version: '3.11'
+        # Set up the provided version or the latest if not specified
+        version: ${{ steps.tool-versions.outputs.uv | 'latest' }}
+        # Use the provided Python version or the default one
+        python-version: ${{ steps.tool-versions.outputs.python || '3.11' }}
 
     - name: Install Poetry
       uses: Gr1N/setup-poetry@v9
       with:
-        poetry-version: "2.1.2"
+        # Set up the provided version or the latest if not specified
+        poetry-version: ${{ steps.tool-versions.outputs.poetry || '' }}
 
     - name: Install poethepoet
       shell: bash
+      # Currently, we just install the latest version of poethepoet.
+      # This should be fine (for now) since Poe changes are generally
+      # backward compatible.
       run: uv tool install poethepoet
 
     - name: Install dependencies