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Basic linting for Emacs Lisp

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.dir-locals.el
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elisp-lint
==========

Basic linting for Emacs Lisp

[![MELPA Stable](https://stable.melpa.org/packages/elisp-lint-badge.svg)](https://stable.melpa.org/#/elisp-lint)
[![MELPA](https://melpa.org/packages/elisp-lint-badge.svg)](https://melpa.org/#/elisp-lint)
[![CircleCI](https://img.shields.io/circleci/project/github/gonewest818/elisp-lint.svg)](https://circleci.com/gh/gonewest818/elisp-lint)
[![codecov](https://codecov.io/gh/gonewest818/elisp-lint/branch/master/graph/badge.svg)](https://codecov.io/gh/gonewest818/elisp-lint)

This is a tool for finding certain problems in Emacs Lisp files. Use it on the command line like this:

emacs -Q --batch -l elisp-lint.el -f elisp-lint-files-batch *.el

You can disable individual checks by passing flags on the command line:

emacs -Q --batch -l elisp-lint.el -f elisp-lint-files-batch --no-indent *.el

You can use file variables or `.dir-locals.el` to disable checks completely, and
also to configure certain checks as described below.

((emacs-lisp-mode . ((fill-column . 80)
                         (indent-tabs-mode . nil)
                         (elisp-lint-ignored-validators . ("byte-compile"))
                         (elisp-lint-indent-specs . ((describe . 1)
                                                     (it . 1))))))

Validators
----------

### byte-compile ###

Byte-compiles the file with all warnings enabled.

### check-declare ###

Verifies all `declare-function` statements are legitimate.

### checkdoc ###

Runs checkdoc on the file to enforce standards in documentation.

### fill-column ###

Verifies that no line exceeds the number of columns in `fill-column`.
Certain lines in the file are excluded from this check, and can
have unlimited length:

* The package summary comment line, which by definition must
  include the package name, a summary description (up to 60
  characters), and an optional `-*- lexical-binding:t -*-`
  declaration.

* The \"Package-Requires\" header, whose length is determined by
  the number of dependencies specified.
 
### indent ###

Verifies that each line is indented according to
`emacs-lisp-mode`. Where macros are defined with special `indent`
metadata, use the `elisp-lint-indent-specs` alist to specify each
symbol's required indent.

### indent-character ###

Verifies the indentation is consistently tabs or spaces, according to
the value of `indent-tabs-mode`.

### package-lint ###

Use `package-lint` to perform checks on package metadata and elisp
style.

Because this check uses the `package` library to validate when
dependencies can be installed from an available package repository,
this check will suppress any "package is not installable" errors when
running in a context where the `package` library is not initialized.
This can happen, e.g. when running Emacs on packages installed with
Cask.

### trailing-whitespace ###

Verifies the buffer has no lines with trailing whitespace.

Configuration
-------------

Use a file variable or `.dir-locals.el` to override the variables
mentioned above.

Sample Report
-------------

``` text
test/data/example.el:0:0 (checkdoc) You should have a section marked ";;; Commentary:"
test/data/example.el:0:0 (checkdoc) The first line should be of the form: ";;; package --- Summary"
test/data/example.el:1:0 (error) Package should have a ;;; Commentary section.
test/data/example.el:1:0 (error) Package should have a Homepage or URL header.
test/data/example.el:1:0 (error) package.el cannot parse this buffer: Package lacks a file header
test/data/example.el:5:0 (checkdoc) You should have a section marked ";;; Code:"
test/data/example.el:8:0 (checkdoc) White space found at end of line
test/data/example.el:8:0 (whitespace) trailing whitespace found
test/data/example.el:9:0 (indent) !      (b y))
test/data/example.el:10:0 (indent) ! 	  (message "%s" a))  
test/data/example.el:10:0 (indent-character) tabs instead of spaces
test/data/example.el:10:0 (whitespace) trailing whitespace found
test/data/example.el:11:0 (fill-column) line length 80 exceeded
test/data/example.el:12:0 (indent) !   (setq a 3)
test/data/example.el:16:0 (error) "foo" doesn't start with package's prefix "difftest".
test/data/example.el:17:0 (checkdoc) First line should be capitalized
test/data/example.el:17:0 (checkdoc) First sentence should end with punctuation
test/data/example.el:17:0 (indent) ! "emacs is fun"
test/data/example.el:18:0 (warning) Closing parens should not be wrapped onto new lines.
test/data/example.el:18:0 (indent) ! )
test/data/example.el:21:0 (checkdoc) The footer should be: (provide 'example)\n;;; example.el ends here
test/data/example.el FAIL
```

Changelog
---------

* Version 0.5-SNAPSHOT (MELPA)
   - suppress "Package X is not installable" errors when running in
     a context where 'package-initialize' hasn't occurred
* Version 0.4-SNAPSHOT (MELPA Stable, March 2020)
   - Provide a summary report of all tests [#20]
   - Integrate package-lint [#19]
   - Remove package-format, as package-lint covers the same territory
   - Make byte-compile errors and warnings more robust
   - Make the fill-column checker ignore the package summary line [#25]
   - Make 'fill-column' checker ignore the package requires header
   - Add dependency on dash.el
   - Colorized output
* Version 0.3 (December 2019)
   - Emacs 23 support is deprecated [#13]
   - Adopt CircleCI and drop Travis CI [#9] [#14]
   - Add check-declare validator [#16]
   - Generate autoloads before bytecompile [#8]
* Version 0.2.0 (Feb 2018)
   - Project transferred to new maintainer
   - Whitespace check permits page-delimiter (^L)
   - Indentation check prints the diff to console
   - User can specify indent specs to tell the checker about macros
   - Added checkdoc (available only Emacs 25 and newer)
   - Cleared up the console output for easier reading in CI
   - Expand Travis CI test matrix to include Emacs 25 and 26
* Version 0.1.0 (2015)
   - Basic linting functionality implemented

Credits
-------

The initial development of `elisp-lint` is Copyright 2013-2015 Nikolaj
Schumacher. This project was transferred to Neil Okamoto in 2018.

Contributing
------------

Pull requests are welcome!

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