Fix entry point discovery for older versions of python

README.md

@@ -5,7 +5,7 @@
 # PeakRDL
 
 PeakRDL is a free and open-source control & status register (CSR) toolchain.
-This projects provides a command-line tool that unifies many aspects of register
+This project provides a command-line tool that unifies many aspects of register
 automation centered around the SystemRDL register description language.
 
 ## Documentation

src/peakrdl/__about__.py

@@ -1 +1 @@
-__version__ = "0.2.0"
+__version__ = "0.3.0"

src/peakrdl/plugins/entry_points.py

@@ -0,0 +1,19 @@
+# type: ignore
+import sys
+
+if sys.version_info >= (3,10,0):
+    from importlib import metadata
+
+    def get_entry_points(group_name):
+        return metadata.entry_points().select(group=group_name)
+
+elif sys.version_info >= (3,8,0):
+    from importlib import metadata
+
+    def get_entry_points(group_name):
+        return metadata.entry_points().get(group_name, tuple())
+
+else:
+    import pkg_resources
+    def get_entry_points(group_name):
+        return pkg_resources.iter_entry_points(group_name)

src/peakrdl/plugins/exporter.py

@@ -1,6 +1,6 @@
 from typing import TYPE_CHECKING, Any, List
-from importlib import metadata
 
+from .import entry_points
 from ..subcommand import ExporterSubcommand
 
 if TYPE_CHECKING:
@@ -79,10 +79,8 @@ def get_exporter_plugins() -> List[ExporterSubcommandPluginWrapper]:
         },
     )
     """
-    eps = metadata.entry_points().select(group='peakrdl.exporters')
-
     exporters = []
-    for ep in eps:
+    for ep in entry_points.get_entry_points("peakrdl.exporters"): # type: ignore
         exporter = ExporterSubcommandPluginWrapper(ep.name, ep.load())
         exporters.append(exporter)
 

src/peakrdl/plugins/importer.py

@@ -1,6 +1,6 @@
 from typing import TYPE_CHECKING, Any, List
-from importlib import metadata
 
+from . import entry_points
 from ..importer import Importer
 
 if TYPE_CHECKING:
@@ -79,10 +79,8 @@ def get_importer_plugins() -> List[Importer]:
         },
     )
     """
-    eps = metadata.entry_points().select(group='peakrdl.importers')
-
     importers = []
-    for ep in eps:
+    for ep in entry_points.get_entry_points("peakrdl.importers"): # type: ignore
         importer = ImporterPluginWrapper(ep.name, ep.load())
         importers.append(importer)