Basic linter types and attributes

This file defines the basic types and attributes used by the linting framework. A linter essentially consists of a function (declaration : Name) → MetaM (Option MessageData), this function together with some metadata is stored in the Linter structure. We define two attributes:

• @[std_linter] applies to a declaration of type Linter and adds it to the default linter set.

• @[nolint linterName] omits the tagged declaration from being checked by the linter with name linterName.

def Std.Tactic.Lint.isAutoDecl (decl : Lean.Name) : Lean.CoreM Bool

Returns true if decl is an automatically generated declaration.

Also returns true if decl is an internal name or created during macro expansion.

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structure Std.Tactic.Lint.Linter : Type

• test : Lean.Name → Lean.MetaM (Option Lean.MessageData)

  test defines a test to perform on every declaration. It should never fail. Returning none signifies a passing test. Returning some msg reports a failing test with error msg.

• noErrorsFound : Lean.MessageData

  noErrorsFound is the message printed when all tests are negative

• errorsFound : Lean.MessageData

  errorsFound is printed when at least one test is positive

• isFast : Bool

  If isFast is false, this test will be omitted from #lint-.

A linting test for the #lint command.

structure Std.Tactic.Lint.NamedLinterextends Std.Tactic.Lint.Linter : Type

• test : Lean.Name → Lean.MetaM (Option Lean.MessageData)
• noErrorsFound : Lean.MessageData
• errorsFound : Lean.MessageData
• isFast : Bool
• name : Lean.Name

  The name of the named linter. This is just the declaration name without the namespace.

• declName : Lean.Name

  The linter declaration name

A NamedLinter is a linter associated to a particular declaration.

def Std.Tactic.Lint.getLinter (name : Lean.Name) (declName : Lean.Name) : Lean.CoreM Std.Tactic.Lint.NamedLinter

Gets a linter by declaration name.

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• Std.Tactic.Lint.getLinter name declName = Std.Tactic.Lint.getLinter.impl✝ name declName

opaque Std.Tactic.Lint.stdLinterExt : Lean.PersistentEnvExtension (Lean.Name × Bool) (Lean.Name × Bool) (Lean.NameMap (Lean.Name × Bool))

Defines the std_linter extension for adding a linter to the default set.

def Std.Tactic.Lint.std_linter : Lean.ParserDescr

Defines the @[std_linter] attribute for adding a linter to the default set. The form @[std_linter disabled] will not add the linter to the default set, but it will be shown by #list_linters and can be selected by the #lint command.

Linters are named using their declaration names, without the namespace. These must be distinct.

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def Std.Tactic.Lint.nolint : Lean.ParserDescr

@[nolint linterName] omits the tagged declaration from being checked by the linter with name linterName.

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opaque Std.Tactic.Lint.nolintAttr : Lean.ParametricAttribute (Array Lean.Name)

Defines the user attribute nolint for skipping #lint

def Std.Tactic.Lint.shouldBeLinted {m : Type → Type} [Monad m] [Lean.MonadEnv m] (linter : Lean.Name) (decl : Lean.Name) : m Bool

Returns true if decl should be checked using linter, i.e., if there is no nolint attribute.

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