utils/file_length/config.py

"""Shared configuration for the 250-line file-length cap.

Single source of truth for the cap and its exemptions, imported by both the
pre-commit gate (`check.py`) and the survey. Duplicating these lists in shell
is what lets a gate and a survey silently disagree.
"""

from __future__ import annotations

import re
from pathlib import Path

#: Hard cap. Files above this fail the gate. Code and prose alike.
MAX_LINES = 250

#: Extensions the cap applies to: real programming languages plus prose.
#: Markup (.html/.css/.scss) is deliberately absent -- templates split into
#: partials, not functions, so a line cap does not express anything useful.
CAPPED_EXTENSIONS = {
    # code
    ".py",
    ".dart",
    ".ts",
    ".tsx",
    ".js",
    ".jsx",
    ".sh",
    ".bash",
    ".zsh",
    ".c",
    ".h",
    ".cpp",
    ".cc",
    ".hpp",
    ".go",
    ".rs",
    ".java",
    ".kt",
    ".kts",
    ".swift",
    ".rb",
    ".lua",
    ".sql",
    ".vue",
    ".cs",
    ".php",
    # prose
    ".md",
    ".markdown",
    ".txt",
    ".rst",
    ".tex",
    ".org",
}

#: Generated files: regenerated by a tool, so splitting them is meaningless
#: (the tool would just rewrite the original next run).
GENERATED_PATTERN = re.compile(
    r"\.g\.dart$"
    r"|\.freezed\.dart$"
    r"|\.gr\.dart$"
    r"|\.config\.dart$"
    r"|\.mocks\.dart$"
    r"|\.min\.(js|css)$"
    r"|\.pb\.(go|py)$"
    r"|_pb2(_grpc)?\.py$"
    r"|\.generated\.ts$"
    r"|\.d\.ts$"
    r"|/l10n/generated/"
    r"|/generated/"
)

#: A marker in the first few lines also marks a file generated. Covers tools
#: that do not use a distinguishing extension.
GENERATED_MARKERS = (
    "GENERATED CODE - DO NOT MODIFY",
    "@generated",
    "DO NOT EDIT",
    "Autogenerated",
    "AUTOGENERATED",
    "generated by",
)

#: Directory names never descended into: dependencies, build output, caches.
EXCLUDED_DIRS = frozenset(
    {
        ".git",
        "node_modules",
        ".dart_tool",
        "build",
        ".venv",
        "venv",
        "env",
        "site-packages",
        "target",
        "ephemeral",
        "__pycache__",
        ".mypy_cache",
        ".pytest_cache",
        ".ruff_cache",
        "dist",
        ".next",
        "vendor",
        "third_party",
        "Pods",
        ".gradle",
        ".idea",
        ".cxx",
        "coverage",
        "htmlcov",
        ".tox",
        "Library",
        "Temp",
        "obj",
        ".terraform",
        ".fvm",
        ".angular",
        ".cache",
        ".svelte-kit",
        "migrations",
        ".ci-mirror-venv",
        ".hippo",
        ".build-deps",
        # Where CI checks out the shared gate itself (kuhyx/utils). Without
        # this, a repo's lint job fails on utils' own long files -- a gate
        # that fails for reasons the repo being gated cannot fix.
        ".utils",
    }
)

#: Third-party content living *inside* a repo you own, keyed by repo dir name.
#: Verified by git remote / vendor manifest, not guessed.
VENDORED_SUBPATHS = {
    "mcp-servers": ("servers",),
    "dufs-cloud": ("app/assets/pdfjs", "web/assets/pdfjs"),
    ".claude": (
        "projects",
        "shell-snapshots",
        "cache",
        "backups",
        "todos",
        "statsig",
        "history",
        "chrome",
        "downloads",
        "plugins",
        "ide",
    ),
    # Agent skill bundles vendored from Anthropic (todo: commit f91311f).
    # A SKILL.md is a fixed-name file with frontmatter; detail belongs in a
    # sibling references/ dir, so splitting one into SKILL.part2.md would
    # break the format rather than improve readability.
    "todo": (".agents/skills",),
}

#: Directory names that mark a vendored agent-skill tree wherever they appear.
#: Keyed by name rather than repo because these bundles get dropped into any
#: repo that wants them, not just the one they were first seen in.
VENDORED_ANYWHERE = ("/.agents/skills/", "/.claude/skills/")

#: Whole repos under ~ that are third-party clones, not kuhy's work.
#: Verified 2026-08-14 by `git remote get-url origin` + commit authors.
THIRD_PARTY_REPOS = frozenset(
    {
        "StringTheory",  # github.com/AnthonySf/TheStringTheory
        "reaper-mcp",  # github.com/TwelveTake-Studios/reaper-mcp
        "freesound-mcp",  # github.com/timjrobinson/FreesoundMCPServer
        "llama_cpp_dart_local",  # generated FFI bindings
        "aseprite-mcp",
        "aur",
        "build-your-own-x",
        "build_your_x",
        "byox-ladder",
        "warriorjs",
        "untools",
        "awesome-mcp-explorer",
        "runnerup",
        "depotdownloader",
        "actions-runner",
    }
)

#: A `.txt` whose mean line is shorter than this is data (a wordlist, a
#: coordinate dump), not prose, so the cap does not apply.
DATA_TXT_MAX_MEAN_LINE = 25


def is_generated(path: Path) -> bool:
    """True if the file is tool-generated and must not be split by hand."""
    if GENERATED_PATTERN.search(path.as_posix()):
        return True
    try:
        with path.open("r", encoding="utf-8", errors="replace") as handle:
            head = "".join(next(handle, "") for _ in range(5))
    except OSError:
        return False
    return any(marker in head for marker in GENERATED_MARKERS)


def is_data_text(path: Path, lines: int, size: int) -> bool:
    """True for wordlist-style .txt: many lines, very short ones."""
    if path.suffix.lower() != ".txt" or lines <= 0:
        return False
    return (size / lines) < DATA_TXT_MAX_MEAN_LINE


def is_vendored(path: Path) -> bool:
    """True if the path sits under a known vendored subtree or excluded dir."""
    parts = path.parts
    if any(part in EXCLUDED_DIRS for part in parts):
        return True
    # Pre-commit passes paths relative to the repo root ('.agents/skills/x'),
    # while --all walks absolute ones ('/home/kuhy/todo/.agents/skills/x').
    # Compare against a leading-slash form so one rule covers both modes.
    posix = path.as_posix()
    anchored = posix if posix.startswith("/") else f"/{posix}"
    if any(marker in anchored for marker in VENDORED_ANYWHERE):
        return True
    for repo, subs in VENDORED_SUBPATHS.items():
        for sub in subs:
            if f"/{repo}/{sub}/" in posix or posix.startswith(f"{repo}/{sub}/"):
                return True
    return any(f"/{repo}/" in posix for repo in THIRD_PARTY_REPOS)