From 613cdc10bc61dbb902a42ccb11fcb472a160771e Mon Sep 17 00:00:00 2001
From: Catherine <whitequark@whitequark.org>
Date: Wed, 4 Oct 2023 00:19:06 +0000
Subject: [PATCH] support.plugin: add python 3.8-3.9 support.

---
 .github/workflows/main.yml         |  4 +++-
 software/glasgow/support/plugin.py | 13 ++++++++-----
 software/pyproject.toml            |  1 +
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c5fa32377..64115f5b9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -51,7 +51,9 @@ jobs:
           YOSYS: yowasp-yosys
           NEXTPNR_ICE40: yowasp-nextpnr-ice40
           ICEPACK: yowasp-icepack
-        run: pdm run test
+        run: |
+          pdm run glasgow --help
+          pdm run test
 
   build-firmware:
     if: (github.event.ref == 'refs/heads/main' || github.event_name == 'pull_request') || github.repository != 'GlasgowEmbedded/glasgow'
diff --git a/software/glasgow/support/plugin.py b/software/glasgow/support/plugin.py
index e2e379f88..e8e32c270 100644
--- a/software/glasgow/support/plugin.py
+++ b/software/glasgow/support/plugin.py
@@ -1,8 +1,11 @@
-import importlib.metadata
 import packaging.requirements
 import pathlib
 import sysconfig
 import textwrap
+try:
+    import importlib_metadata # py3.9-
+except ImportError:
+    import importlib.metadata as importlib_metadata
 
 
 __all__ = ["PluginRequirementsUnmet", "PluginMetadata"]
@@ -24,8 +27,8 @@ def _unmet_requirements_in(requirements):
     unmet_requirements = set()
     for requirement in requirements:
         try:
-            version = importlib.metadata.version(requirement.name)
-        except importlib.metadata.PackageNotFoundError:
+            version = importlib_metadata.version(requirement.name)
+        except importlib_metadata.PackageNotFoundError:
             unmet_requirements.add(requirement)
             continue
         if not requirement.specifier.contains(version):
@@ -64,11 +67,11 @@ class PluginMetadata:
 
     @classmethod
     def get(cls, handle):
-        return cls(importlib.metadata.entry_points(group=cls.GROUP_NAME, name=handle)[0])
+        return cls(importlib_metadata.entry_points(group=cls.GROUP_NAME, name=handle)[0])
 
     @classmethod
     def all(cls):
-        return {ep.name: cls(ep) for ep in importlib.metadata.entry_points(group=cls.GROUP_NAME)}
+        return {ep.name: cls(ep) for ep in importlib_metadata.entry_points(group=cls.GROUP_NAME)}
 
     def __init__(self, entry_point):
         if entry_point.dist.name != "glasgow":
diff --git a/software/pyproject.toml b/software/pyproject.toml
index 30da71e6a..4b40abad2 100644
--- a/software/pyproject.toml
+++ b/software/pyproject.toml
@@ -18,6 +18,7 @@ classifiers = [
 requires-python = "~=3.8"
 dependencies = [
   "packaging>=23",
+  "importlib_metadata; python_version<'3.10'",
   "appdirs~=1.4",
   "amaranth[builtin-yosys] @ git+https://github.com/amaranth-lang/amaranth.git",
   "fx2>=0.11",