file_max_lines

File must have at most max_lines lines, using the same accounting as file_min_lines. Catches the everything-module anti-pattern — a lib.rs / index.ts / helpers.py that grew unbounded.

Choosing a limit: set it just above the largest file you accept today, as a ratchet rather than an ideal, and lower it as modules get split. Scope it to hand-written sources (paths: "src/**/*.rs") and leave out lockfiles, generated code, fixtures and vendored files, which are long by nature. A warning level suits an advisory size budget; an error suits a hard cap.

Lines and bytes are different budgets: a minified bundle can be one enormous line, which file_max_lines passes. Pair it with file_max_size when the concern is repository weight rather than readability.

Options

Option	Type	Required	Default	Description
max_lines	integer (>= 0)	yes		Maximum allowed line count.

Plus the common paths, level, id, when, scope_filter, and expect_matches fields. This table is generated from the JSON Schema; option types and defaults are authoritative.

Example

A source file over the line cap

The rule fires on this repository:

• src/
• src/bloated.rs⚠

  ⚠ warning cap-source-file

  file has 7 line(s); at most 5 allowed

• src/tiny.rs✓

src/bloated.rs

fn a() {}
fn b() {}
fn c() {}
fn d() {}
fn e() {}
fn f() {}
fn g() {}

src/tiny.rs

fn a() {}

With this .alint.yml:

version: 1
rules:
  - id: cap-source-file
    kind: file_max_lines
    paths: "src/**/*.rs"
    max_lines: 5
    level: warning

alint check reports:

--- src/bloated.rs -------------------------------------------------------------
  !  warning  cap-source-file
              file has 7 line(s); at most 5 allowed

Summary (1 violation):
  ! 1 warning
  0 passing * 1 failing

A source file within the line cap

This repository is compliant:

• src/
• src/medium.rs✓
• src/tiny.rs✓

src/medium.rs

fn a() {}
fn b() {}
fn c() {}
fn d() {}
fn e() {}

src/tiny.rs

fn a() {}

With this .alint.yml:

version: 1
rules:
  - id: cap-source-file
    kind: file_max_lines
    paths: "src/**/*.rs"
    max_lines: 5
    level: warning

alint check reports:

v All 1 rule(s) passed.