Work on generating build tree for slang files

kitty_tests/check_build.py

@@ -28,7 +28,7 @@ class TestBuild(BaseTest):
         self.assertTrue(os.access(exe, os.X_OK))
         self.assertTrue(os.path.isfile(exe))
         self.assertIn(str_version, subprocess.check_output([exe, '--version']).decode())
-        self.assertTrue(shutil.which(slangc[0]), f'slang compiler not found on PATH: {slangc[0]}')
+        self.assertTrue(shutil.which(slangc[0]), f'slang compiler: {slangc[0]} not found on PATH: {os.environ["PATH"]}')
 
     def test_loading_extensions(self) -> None:
         import kitty.fast_data_types as fdt

kitty_tests/slang.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2026, Kovid Goyal <kovid at kovidgoyal.net>
+
+
+from kitty.shaders.slang import EntryPoint, SlangFile, Stage, parse_slang_text
+
+from . import BaseTest
+
+
+class TestSlang(BaseTest):
+
+    def test_slang_parser(self):
+        for src, expected in {
+            '''
+[shader("vertex")]
+void drawTriangle(float4 pos : POSITION) {
+    // vertex code
+}
+
+[shader("fragment")]
+[numthreads(1, 1, 1)] // Handles intermediate attributes seamlessly
+float4 psMain() : SV_Target {
+    return float4(1, 0, 0, 1);
+}
+            ''': SlangFile(
+                '', '', frozenset(), frozenset({EntryPoint(Stage.vertex, 'drawTriangle'), EntryPoint(Stage.fragment, 'psMain')}), ''),
+                }.items():
+            actual = parse_slang_text(src)
+            actual = actual._replace(text='')
+            self.assertEqual(expected, actual)
+
+    def test_slang_ordering(self):
+        pass  # TODO: Test get_ordered_sources_in_tree()