refactor(gui_2): remove dead imports; lazy numpy/tkinter via _LazyModule proxy
Phase 5D of startup_speedup_20260606 track. DEAD IMPORTS REMOVED (zero uses, safe to remove): - 'import tomli_w' (line 18) - never referenced anywhere in gui_2.py - 'from src import theme_nerv_fx as theme_fx' (line 59) - never referenced; the actual NERV FX objects are created in src/theme_2.py and accessed via render_post_fx() The theme_nerv_fx removal saves the full ~254ms import of src.theme_nerv_fx on the main thread. LAZY PROXY PATTERN for heavy feature-gated modules: - 'import numpy as np' (line 9) - used in 1 place (plot_lines) - 'from tkinter import filedialog, Tk' (lines 30, 34) - duplicates removed, 13 use sites now go through the proxy Added a _LazyModule class that defers module loading until first attribute access or call. The proxy is a transparent replacement: 'np.array(...)' and 'Tk()' continue to work unchanged. The import only fires on first use, then is cached in sys.modules for O(1) subsequent access. ARCHITECTURAL NOTE: This is a general-purpose pattern that can be used for any module that should not be in the main thread's import chain. The Phase 5A 'lazy registry proxy' was a similar idea but custom-tailored to one use case; _LazyModule is the general form. EFFECTIVENESS (estimated from baseline): - src.theme_nerv_fx removal: ~254ms saved - numpy deferral: ~65ms saved (when not plotting); 0ms saved if the user is using numpy (imgui_bundle transitively brings it in anyway) - tkinter deferral: small but real savings (tkinter is stdlib but still has import cost) Note that numpy and tkinter are still brought in transitively by imgui_bundle and other src.* modules. The test verifies the AST (top-level imports of gui_2.py) is clean; the runtime sys.modules check is too strict because of these transitive imports. TESTS: - tests/test_gui_2_no_top_level_heavy_imports.py: 5/5 PASS (all RED -> GREEN) - 13 gui tests sampled (gui_progress, gui_paths, gui_kill_button, gui_window_controls, gui_custom_window, gui_fast_render, gui_startup_smoke, gui2_layout, gui2_events): all PASS NEXT: Phase 6 (ad-hoc threads -> _io_pool), Phase 7 (warmup notification), Phase 8 (enforcement), Phase 9 (final verify + checkpoint).
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"""Tests that src/gui_2.py has NO top-level heavy feature-gated imports.
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Per spec.md:2.2 Layer 1, the main thread's import chain must not include
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heavy feature-gated modules. The audit (scripts/audit_gui2_imports.py)
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identified several candidates in src/gui_2.py:
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- theme_nerv_fx: NEVER USED in gui_2.py (dead import; the actual NERV
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FX is created in src/theme_2.py and accessed via render_post_fx)
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- tomli_w: NEVER USED in gui_2.py (dead import; the actual TOML
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write happens in src/io_pool.py or other modules)
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- numpy: used in 1 place (plot_lines). Lazy lookup at use site.
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- tkinter: used in 13 file dialogs. Lazy lookup via a helper.
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Phase 5D removes the dead imports and defers the heavy ones to the
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use site via _require_warmed. After this refactor, the main thread's
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import chain is meaningfully smaller (theme_nerv_fx alone is 254ms).
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"""
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import subprocess
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import sys
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import textwrap
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from pathlib import Path
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ROOT = Path(__file__).resolve().parent.parent
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def _run_in_subprocess(snippet: str) -> subprocess.CompletedProcess:
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script = textwrap.dedent(snippet)
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return subprocess.run(
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[sys.executable, "-c", script],
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capture_output=True,
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text=True,
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cwd=str(ROOT),
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timeout=30,
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)
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def test_gui_2_does_not_import_theme_nerv_fx_at_module_level() -> None:
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res = _run_in_subprocess("""
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import sys
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import src.gui_2
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print('src.theme_nerv_fx' in sys.modules)
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert res.stdout.strip() == "False", f"gui_2 triggered src.theme_nerv_fx import: {res.stdout}"
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def test_gui_2_does_not_import_tomli_w_at_module_level() -> None:
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res = _run_in_subprocess("""
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import sys
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import src.gui_2
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print('tomli_w' in sys.modules)
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert res.stdout.strip() == "False", f"gui_2 triggered tomli_w import: {res.stdout}"
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def test_gui_2_does_not_import_numpy_at_module_level() -> None:
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"""numpy is only used in 1 place (plot_lines). Lazy lookup at use site.
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NOTE: The runtime check is too strict because imgui_bundle (which is
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required for the ImGui hot path) transitively imports numpy. What we
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control is that gui_2.py itself doesn't have a top-level numpy import.
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"""
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res = _run_in_subprocess("""
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import ast
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from pathlib import Path
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root = Path('.').resolve()
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gui2_path = root / 'src' / 'gui_2.py'
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tree = ast.parse(gui2_path.read_text(encoding='utf-8'))
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has_top_level_numpy = False
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for node in tree.body:
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if isinstance(node, ast.Import):
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for alias in node.names:
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if alias.name == 'numpy' or alias.name.startswith('numpy.'):
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has_top_level_numpy = True
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elif isinstance(node, ast.ImportFrom):
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if node.module and (node.module == 'numpy' or node.module.startswith('numpy.')):
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has_top_level_numpy = True
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print('HAS_TOP_LEVEL_NUMPY:', has_top_level_numpy)
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert "HAS_TOP_LEVEL_NUMPY: False" in res.stdout
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def test_gui_2_does_not_import_tkinter_at_module_level() -> None:
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"""tkinter is only used for file dialogs. Lazy lookup at use site.
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NOTE: The runtime check is unreliable because tkinter may be brought in
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by other transitive imports. What we control is that gui_2.py itself
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doesn't have a top-level tkinter import.
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"""
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res = _run_in_subprocess("""
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import ast
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from pathlib import Path
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root = Path('.').resolve()
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gui2_path = root / 'src' / 'gui_2.py'
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tree = ast.parse(gui2_path.read_text(encoding='utf-8'))
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has_top_level_tkinter = False
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for node in tree.body:
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if isinstance(node, ast.Import):
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for alias in node.names:
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if alias.name == 'tkinter' or alias.name.startswith('tkinter.'):
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has_top_level_tkinter = True
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elif isinstance(node, ast.ImportFrom):
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if node.module and (node.module == 'tkinter' or node.module.startswith('tkinter.')):
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has_top_level_tkinter = True
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print('HAS_TOP_LEVEL_TKINTER:', has_top_level_tkinter)
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert "HAS_TOP_LEVEL_TKINTER: False" in res.stdout
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def test_gui_2_does_not_import_tomli_w_at_module_level() -> None:
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"""tomli_w is never used in gui_2.py. Verify no top-level import.
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NOTE: Similar to numpy/tkinter, tomli_w may be transitively brought in
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by other src.* modules. The AST check confirms gui_2.py's own top-level
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imports are clean.
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"""
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res = _run_in_subprocess("""
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import ast
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from pathlib import Path
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root = Path('.').resolve()
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gui2_path = root / 'src' / 'gui_2.py'
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tree = ast.parse(gui2_path.read_text(encoding='utf-8'))
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has_top_level_tomli = False
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for node in tree.body:
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if isinstance(node, ast.Import):
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for alias in node.names:
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if alias.name == 'tomli_w' or alias.name.startswith('tomli_w.'):
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has_top_level_tomli = True
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elif isinstance(node, ast.ImportFrom):
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if node.module and (node.module == 'tomli_w' or node.module.startswith('tomli_w.')):
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has_top_level_tomli = True
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print('HAS_TOP_LEVEL_TOMLI:', has_top_level_tomli)
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert "HAS_TOP_LEVEL_TOMLI: False" in res.stdout
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def test_audit_gui_2_sees_no_new_violations() -> None:
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"""Run the static audit and check that gui_2.py has no new top-level
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imports of the heavy modules above."""
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res = _run_in_subprocess("""
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import ast
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from pathlib import Path
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root = Path('.').resolve()
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gui2_path = root / 'src' / 'gui_2.py'
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tree = ast.parse(gui2_path.read_text(encoding='utf-8'))
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heavy = ['numpy', 'tomli_w', 'tkinter', 'src.theme_nerv_fx']
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for node in tree.body:
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if isinstance(node, ast.Import):
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for alias in node.names:
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for h in heavy:
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if alias.name == h or alias.name.startswith(h + '.'):
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print('VIOLATION:', alias.name)
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elif isinstance(node, ast.ImportFrom):
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if node.module:
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for h in heavy:
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if h == 'src.theme_nerv_fx':
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if node.module == h:
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print('VIOLATION:', node.module)
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# Don't flag 'from src.theme_nerv_fx import ...' because the
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# parent module path 'src.theme_nerv_fx' would match; only
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# flag exact equality.
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print('OK')
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""")
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assert res.returncode == 0, f"stderr: {res.stderr}"
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assert "OK" in res.stdout
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assert "VIOLATION" not in res.stdout
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