Migrate to the PDM build system

Avoids problems with .git_archival.txt breaking reproducibility.

Nabbed from
https://github.com/amaranth-lang/amaranth-soc/commit/d66881d83419c689fc96168150e57d9f467723aa

5 files changed, 16 insertions, 25 deletions

diff --git a/.git_archival.txt b/.git_archival.txt
deleted file mode 100644
index 8fb235d..0000000
--- a/.git_archival.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-node: $Format:%H$
-node-date: $Format:%cI$
-describe-name: $Format:%(describe:tags=true,match=*[0-9]*)$
-ref-names: $Format:%D$
diff --git a/.gitattributes b/.gitattributes
deleted file mode 100644
index a94cb2f..0000000
--- a/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-.git_archival.txt export-subst
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 43d0efc..7bdf6ec 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -35,10 +35,15 @@ jobs:
     steps:
       - name: Check out source code
         uses: actions/checkout@v3
-      - name: Set up Python
-        uses: actions/setup-python@v4
+        with:
+          fetch-depth: 0
+      - name: Set up PDM
+        uses: pdm-project/setup-pdm@v3
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          pdm install --dev
       - name: Install Amaranth release
         if: ${{ matrix.amaranth-version != 'git' }}
         run: |
@@ -49,7 +54,7 @@ jobs:
           pip install 'amaranth[builtin-yosys] @ git+https://github.com/amaranth-lang/amaranth.git'
       - name: Run tests
         run: |
-          python -m unittest discover -t . -s amaranth_boards -p '*.py'
+          pdm run test
 
   required: # group all required workflows into one to avoid reconfiguring this in Actions settings
     needs:
diff --git a/pyproject.toml b/pyproject.toml
index 93a981d..8cf2701 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,8 @@
+# Project metadata
+
+[tool.pdm.version]
+source = "scm"
+
 [project]
 dynamic = ["version"]
 
@@ -19,18 +24,8 @@ dependencies = [
 # Build system configuration
 
 [build-system]
-requires = ["wheel", "setuptools>=67.0", "setuptools_scm[toml]>=6.2"]
-build-backend = "setuptools.build_meta"
-
-[tool.setuptools]
-# If old amaranth-boards is checked out with git (e.g. as a part of a persistent editable install
-# or a git worktree cached by tools like poetry), it can have an empty `nmigen_boards` directory
-# left over, which causes a hard error because setuptools cannot determine the top-level package.
-# Add a workaround to improve experience for people upgrading from old checkouts.
-packages = ["amaranth_boards"]
-
-[tool.setuptools_scm]
-local_scheme = "node-and-timestamp"
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"
 
 # Development workflow configuration
 
@@ -44,4 +39,4 @@ toolchain = [
 
 [tool.pdm.scripts]
 _.env_file = ".env.toolchain"
-test.cmd = "python -m unittest discover -t . -s amaranth_boards -p *.py"
\ No newline at end of file
+test.cmd = "python -m unittest discover -t . -s amaranth_boards -p *.py"
diff --git a/setup.py b/setup.py
deleted file mode 100644
index b024da8..0000000
--- a/setup.py
+++ /dev/null
@@ -1,4 +0,0 @@
-from setuptools import setup
-
-
-setup()