Linter frontend and commands

This file defines the linter commands which spot common mistakes in the code.

• #lint: check all declarations in the current file
• #lint in Pkg: check all declarations in the package Pkg (so excluding core or other projects, and also excluding the current file)
• #lint in all: check all declarations in the environment (the current file and all imported files)

For a list of default / non-default linters, see the "Linting Commands" user command doc entry.

The command #list_linters prints a list of the names of all available linters.

You can append a * to any command (e.g. #lint* in Std) to omit the slow tests.

You can append a - to any command (e.g. #lint- in Std) to run a silent lint that suppresses the output if all checks pass. A silent lint will fail if any test fails.

You can append a + to any command (e.g. #lint+ in Std) to run a verbose lint that reports the result of each linter, including the successes.

You can append a sequence of linter names to any command to run extra tests, in addition to the default ones. e.g. #lint doc_blame_thm will run all default tests and doc_blame_thm.

You can append only name1 name2 ... to any command to run a subset of linters, e.g. #lint only unused_arguments in Std

You can add custom linters by defining a term of type Linter with the @[std_linter] attribute. A linter defined with the name Std.Tactic.Lint.myNewCheck can be run with #lint myNewCheck or #lint only myNewCheck. If you add the attribute @[std_linter disabled] to linter.myNewCheck it will be registered, but not run by default.

Adding the attribute @[nolint doc_blame unused_arguments] to a declaration omits it from only the specified linter checks.

Tags

sanity check, lint, cleanup, command, tactic

inductive Std.Tactic.Lint.LintVerbosity : Type

• low: Std.Tactic.Lint.LintVerbosity

  low: only print failing checks, print nothing on success.

• medium: Std.Tactic.Lint.LintVerbosity

  medium: only print failing checks, print confirmation on success.

• high: Std.Tactic.Lint.LintVerbosity

  high: print output of every check.

Verbosity for the linter output.

instance Std.Tactic.Lint.instInhabitedLintVerbosity : Inhabited Std.Tactic.Lint.LintVerbosity

Equations

• Std.Tactic.Lint.instInhabitedLintVerbosity = { default := Std.Tactic.Lint.LintVerbosity.low }

instance Std.Tactic.Lint.instDecidableEqLintVerbosity : DecidableEq Std.Tactic.Lint.LintVerbosity

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instance Std.Tactic.Lint.instReprLintVerbosity : Repr Std.Tactic.Lint.LintVerbosity

Equations

• Std.Tactic.Lint.instReprLintVerbosity = { reprPrec := Std.Tactic.Lint.reprLintVerbosity✝ }

def Std.Tactic.Lint.getChecks (slow : Bool) (useOnly : Bool) : Lean.CoreM (Array Std.Tactic.Lint.NamedLinter)

getChecks slow extra use_only produces a list of linters. extras is a list of names that should resolve to declarations with type linter. If useOnly is true, it only uses the linters in extra. Otherwise, it uses all linters in the environment tagged with @[std_linter]. If slow is false, it only uses the fast default tests.

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def Std.Tactic.Lint.lintCore (decls : Array Lean.Name) (linters : Array Std.Tactic.Lint.NamedLinter) : Lean.CoreM (Array (Std.Tactic.Lint.NamedLinter × Lean.HashMap Lean.Name Lean.MessageData))

Runs all the specified linters on all the specified declarations in parallel, producing a list of results.

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def Std.Tactic.Lint.sortResults {α : Type} (results : Lean.HashMap Lean.Name α) : Lean.CoreM (Array (Lean.Name × α))

Sorts a map with declaration keys as names by line number.

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def Std.Tactic.Lint.printWarning (declName : Lean.Name) (warning : Lean.MessageData) (useErrorFormat : optParam Bool false) (filePath : optParam System.FilePath default) : Lean.CoreM Lean.MessageData

Formats a linter warning as #check command with comment.

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def Std.Tactic.Lint.printWarnings (results : Lean.HashMap Lean.Name Lean.MessageData) (filePath : optParam System.FilePath default) (useErrorFormat : optParam Bool false) : Lean.CoreM Lean.MessageData

Formats a map of linter warnings using print_warning, sorted by line number.

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def Std.Tactic.Lint.groupedByFilename (results : Lean.HashMap Lean.Name Lean.MessageData) (useErrorFormat : optParam Bool false) : Lean.CoreM Lean.MessageData

Formats a map of linter warnings grouped by filename with -- filename comments. The first drop_fn_chars characters are stripped from the filename.

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def Std.Tactic.Lint.formatLinterResults (results : Array (Std.Tactic.Lint.NamedLinter × Lean.HashMap Lean.Name Lean.MessageData)) (decls : Array Lean.Name) (groupByFilename : Bool) (whereDesc : String) (runSlowLinters : Bool) (verbose : Std.Tactic.Lint.LintVerbosity) (numLinters : Nat) (useErrorFormat : optParam Bool false) : Lean.CoreM Lean.MessageData

Formats the linter results as Lean code with comments and #check commands.

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def Std.Tactic.Lint.getDeclsInCurrModule : Lean.CoreM (Array Lean.Name)

Get the list of declarations in the current module.

Equations

• Std.Tactic.Lint.getDeclsInCurrModule = do let __do_lift ← Lean.getEnv pure (Lean.PersistentHashMap.foldl __do_lift.constants.map₂ (fun r k x => Array.push r k) #[])

def Std.Tactic.Lint.getAllDecls : Lean.CoreM (Array Lean.Name)

Get the list of all declarations in the environment.

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def Std.Tactic.Lint.getDeclsInPackage (pkg : Lean.Name) : Lean.CoreM (Array Lean.Name)

Get the list of all declarations in the specified package.

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

The in foo config argument allows running the linter on a specified project.

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def Std.Tactic.Lint.«command#lint+-*Only___» : Lean.ParserDescr

The command #lint runs the linters on the current file (by default).

#lint only someLinter can be used to run only a single linter.

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def Std.Tactic.Lint.«command#list_linters» : Lean.ParserDescr

The command #list_linters prints a list of all available linters.

Equations

• Std.Tactic.Lint.«command#list_linters» = Lean.ParserDescr.node `Std.Tactic.Lint.command#list_linters 1024 (Lean.ParserDescr.symbol "#list_linters")