indent_style

Every non-blank line indents with the configured style (tabs or spaces). When style: spaces, optional width enforces a multiple.

Fix: indent_style — reindents tab-indented lines to spaces, for a style: spaces + width: N rule only (the width is the spaces-per-tab). It converts a PURE-TAB leading run to N spaces per tab (1 tab → N, 2 tabs → 2N), preserving the rest of the line, its terminator, and the trailing-newline state; it declines the genuinely ambiguous cases — a mixed tab+space lead, or a pure-space run that isn't a multiple of width — so check does not advertise those as auto-fixable. A tabs-style or width-less rule with a fix is rejected at load (spaces → tabs has no spaces-per-tab). Unsafe by default — a mis-aimed reindent hard-breaks an indent-significant file (a Makefile recipe requires a literal tab), so a bare alint fix suggests it and --unsafe-fixes (or a per-rule applicability: safe) applies it; it is also demoted to a suggestion from an untrusted remote extends:. With no fix declared, violations are unfixable; pair with your editor's "reindent on save".

Options

Option	Type	Required	Default	Description
style	one of tabs | spaces	yes		Required indentation style: tabs rejects any leading space; spaces rejects any leading tab.
width	integer (>= 1)		null	When style: spaces, the leading-space count on every non-blank line must be a multiple of this. Ignored for style: tabs.

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

Example

A Go file indented with spaces instead of tabs

The rule fires on this repository:

• src/
• src/bad.go✗

  ✗ error go-tabs

  4:1 line 4 indented with the wrong character (expected tabs)

• src/ok.go✓

src/bad.go

package main

func y() {
    return
}

src/ok.go

package main

func x() {
  return
}

With this .alint.yml:

version: 1
rules:
  - id: go-tabs
    kind: indent_style
    paths: "src/**/*.go"
    style: tabs
    level: error

alint check reports:

--- src/bad.go -----------------------------------------------------------------
  x  error    go-tabs
              4:1  line 4 indented with the wrong character (expected tabs)

Summary (1 violation):
  x 1 error
  0 passing * 1 failing

Every Go file is indented with tabs

This repository is compliant:

• src/
• src/a.go✓
• src/b.go✓

src/a.go

package main

func x() {
  return
}

src/b.go

package main

func y() {
  if true {
    return
  }
}

With this .alint.yml:

version: 1
rules:
  - id: go-tabs
    kind: indent_style
    paths: "src/**/*.go"
    style: tabs
    level: error

alint check reports:

v All 1 rule(s) passed.