Fix a bug referencing imported Python names containing dashes in place of underscores

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  * Fix an issue with `basilisp test` standard streams output that can lead to failures on MS-Windows (#1080)
  * Fix an issue where destructuring a vector would throw an exception rather than returning `nil` for invalid key types (#1090)
  * Fix an issue where destructuring default values would take precedence over falsey values in the source data structure (#1078)
+ * Fixed a bug where imported Python names containing `-` (in lieu of `_`) could not be referenced using the `-` syntax (#1085)
 
 ### Removed
  * Removed support for Python 3.8 (#1083)

src/basilisp/lang/compiler/analyzer.py

@@ -3505,8 +3505,13 @@ def __resolve_namespaced_symbol_in_ns(
     namespace portion"""
     assert form.ns is not None
 
+    # Import names are always munged by the compiler when they're added to imports,
+    # but if the user provides an import alias that is left untouched. Check for
+    # the munged symbol in `Namespace.imports` and the unmunged in
+    # `Namespace.import_aliases`.
     ns_sym = sym.symbol(form.ns)
-    if ns_sym in which_ns.imports or ns_sym in which_ns.import_aliases:
+    import_sym = sym.symbol(munge(form.ns))
+    if import_sym in which_ns.imports or ns_sym in which_ns.import_aliases:
         # Fetch the full namespace name for the aliased namespace/module.
         # We don't need this for actually generating the link later, but
         # we _do_ need it for fetching a reference to the module to check
@@ -3516,7 +3521,7 @@ def __resolve_namespaced_symbol_in_ns(
             assert ns is not None
             ns_name = ns.name
         else:
-            ns_name = ns_sym.name
+            ns_name = import_sym.name
 
         safe_module_name = munge(ns_name)
         assert (

tests/basilisp/compiler_test.py

@@ -5,6 +5,7 @@
 import inspect
 import logging
 import os
+import pathlib
 import re
 import sys
 import textwrap
@@ -6387,6 +6388,19 @@ def test_aliased_namespace_not_hidden_by_python_module(
                 monkeypatch.chdir(cwd)
                 os.unlink(module_file_path)
 
+    def test_import_name_with_underscores_resolves_properly(
+        self,
+        lcompile: CompileFn,
+        monkeypatch: pytest.MonkeyPatch,
+        tmp_path: pathlib.Path,
+    ):
+        package = tmp_path / "a_b"
+        package.mkdir(parents=True)
+        file = package / "c.py"
+        file.write_text("val = 10")
+        monkeypatch.syspath_prepend(str(tmp_path))
+        assert lcompile("(import a-b.c) [a-b.c/val a_b.c/val]") == vec.v(10, 10)
+
     @pytest.mark.parametrize(
         "code",
         [