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package-lint.el
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package-lint.el
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;;; package-lint.el --- A linting library for elisp package authors -*- lexical-binding: t -*-
;; Copyright (C) 2014-2020 Steve Purcell, Fanael Linithien
;; Author: Steve Purcell <steve@sanityinc.com>
;; Fanael Linithien <fanael4@gmail.com>
;; URL: https://github.com/purcell/package-lint
;; Keywords: lisp
;; Version: 0.23
;; Package-Requires: ((emacs "24.4") (let-alist "1.0.6"))
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Provides a list of issues with the package metadata of a file,
;; e.g. the package dependencies it requires.
;; See function `package-lint-buffer'.
;; Checks will currently be enabled only if a "Package-Requires:" or
;; "Package-Version:" header is present in the file.
;;; Code:
(eval-when-compile (require 'pcase)) ; `pcase-dolist' is not autoloaded
(require 'cl-lib)
(require 'package)
(require 'lisp-mnt)
(require 'finder)
(require 'imenu)
(require 'let-alist)
(require 'rx)
(defvar package-lint-main-file nil
"For multi-file packages, set this to the main .el or -pkg.el file.
When set, the package prefix and dependencies are obtained from
that file instead of the buffer being linted. This allows
package-lint to operate on secondary files in a package.
The path can be absolute or relative to that of the linted file.")
(put 'package-lint-main-file 'safe-local-variable #'stringp)
;;; Compatibility
(defalias 'package-lint--package-desc-summary
(if (fboundp 'package-desc-summary)
'package-desc-summary
'package-desc-doc))
(defalias 'package-lint--package-desc-name
(if (fboundp 'package-desc-name)
'package-desc-name
(lambda (desc) (intern (elt desc 0)))))
(defalias 'package-lint--package-desc-from-define
(if (fboundp 'package-desc-from-define)
'package-desc-from-define
(lambda (_name-string version-string &optional docstring requirements &rest _args)
(vector
(version-to-list version-string)
(mapcar
(lambda (x)
(list (nth 0 x) (version-to-list (nth 1 x))))
(nth 1 requirements))
docstring))))
;;; Machinery
(defvar package-lint--errors nil
"List of errors and warnings for the current buffer.
This is bound dynamically while the checks run.")
(defconst package-lint-emacs-head-version '(30)
"Version of Emacs HEAD.")
(defconst package-lint-backport-libraries
(list (list 'cl-lib "\\`cl-")
(list 'cl-generic "\\`cl-\\(?:def\\)?generic")
(list 'cl-print "\\`cl-print")
(list 'jsonrpc "\\`jsonrpc-")
(list 'map "\\`map-")
(list 'nadvice "\\`advice-")
(list 'ol "\\`org-link-" 'org "9.3")
(list 'seq "\\`seq-")
(list 'transient "\\`transient-")
(list 'hierarchy "\\`hierarchy-")
(list 'let-alist "\\`let-alist"))
"A sequence of (FEATURE SYMBOL-NAME-MATCH) for backport libraries.
These are libraries that are built into newer Emacsen and also
published in ELPA for use by older Emacsen.
Alternatively, items can take a form of (FEATURE
SYMBOL-NAME-MATCH PACKAGE VERSION?) where PACKAGE is the name of
a backport library shipping the feature and VERSION is an
optional minimum version containing the feature.")
(defun package-lint--load-data (file)
"Load sexp data from FILE."
(with-temp-buffer
(insert-file-contents
(expand-file-name file
(if load-file-name
(file-name-directory load-file-name)
default-directory)))
(read (current-buffer))))
(defconst package-lint-symbol-info
(let* ((stdlib-changes (package-lint--load-data "data/stdlib-changes"))
(info (make-hash-table)))
(pcase-dolist (`(,version . ,data) stdlib-changes)
(pcase-dolist (`(,syms . ,action)
(let-alist data
(list (cons .variables.added 'variable-added)
(cons .variables.removed 'variable-removed)
(cons .features.added 'library-added)
(cons .features.removed 'library-removed)
(cons .functions.added 'function-added)
(cons .functions.removed 'function-removed))))
(dolist (sym syms)
(puthash sym (cons (cons action version) (gethash sym info)) info))))
info)
"A hash table from SYMBOL to a list of events in its history.
Each event is of the form (ACTION . EMACS-VER), where ACTION is a
symbol such as `variable-added'.")
(defun package-lint-symbol-info (sym)
"Retrieve information about SYM, as an alist of (ACTION . EMACS-VER)."
(gethash (cl-etypecase sym
(string (intern sym))
(symbol sym))
package-lint-symbol-info))
(defun package-lint--read-known-symbol (prompt)
"Read a symbol `package-lint-symbol-info' with PROMPT."
(let* ((at-point (symbol-at-point))
(s (completing-read
prompt
(cl-loop for k being the hash-keys of package-lint-symbol-info collect k)
nil
t
(when at-point (symbol-name at-point)))))
(when s (intern s))))
;;;###autoload
(defun package-lint-describe-symbol-history (sym)
"Show the version history of SYM, if any."
(interactive (list (package-lint--read-known-symbol "Show history of symbol: ")))
(message
(concat (format "History of %s:\n" sym)
(mapconcat (lambda (info)
(pcase-let ((`(,action . ,version) info))
(format "* %s in Emacs %s"
action (mapconcat 'number-to-string version "."))))
(sort (package-lint-symbol-info sym)
(lambda (a b) (version-list-<= (cdr a) (cdr b))))
"\n"))))
(defun package-lint--added-or-removed-function-p (sym)
"Return t if SYM is a function added/removed in any known Emacs version."
(let-alist (package-lint-symbol-info sym)
(or .function-added .function-removed)))
(defconst package-lint--compat-symbols
(package-lint--load-data "data/compat-symbols")
"A cons cell of (VARS . FUNCTIONS) supported by \"compat\".")
(defun package-lint--supported-by-compat (type sym)
"Return non-nil if SYM is supported by the \"compat\" package.
TYPE is `function' or `variable'."
(memq sym (pcase type
(`function (cdr package-lint--compat-symbols))
(_ nil))))
(defconst package-lint--sane-prefixes
(rx
string-start
(or
"org-dblock-write:"
"org-babel-execute:"
"org-babel-expand-body:"
"org-babel-prep-session:"
"org-babel-variable-assignments:"
"org-babel-default-header-args:"
"pcomplete/"
"use-package-normalize/"
"use-package-handler/"
"use-package-autoloads/"))
"A regexp matching whitelisted non-standard symbol prefixes.")
(defvar package-lint--allowed-prefix-mappings
'(("ob-" . ("org-"))
("oc-" . ("org-"))
("ol-" . ("org-"))
("ox-" . ("org-")))
"Alist containing mappings of package prefixes to symbol prefixes.")
(defun package-lint--main-file-p ()
"Return non-nil if the current buffer corresponds to the package's main file."
(or (null package-lint-main-file)
(null (buffer-file-name))
(string= (file-truename (expand-file-name package-lint-main-file))
(file-truename (buffer-file-name)))))
(defun package-lint--check-all ()
"Return a list of errors/warnings for the current buffer."
(let ((package-lint--errors '())
(case-fold-search nil))
(save-match-data
(save-excursion
(save-restriction
(widen)
(let (prefix deps)
(if (package-lint--main-file-p)
(progn
;; TODO: handle when the main file is a -pkg.el file
(setq prefix (package-lint--get-package-prefix))
(let ((desc (package-lint--check-package-el-can-parse)))
(when desc
(package-lint--check-package-summary desc)
(package-lint--check-provide-form desc)
(package-lint--check-no-emacs-in-package-name desc)))
(setq deps (package-lint--check-dependency-list))
(package-lint--check-url-header)
(package-lint--check-package-version-present)
(package-lint--check-commentary-existence))
;; Need to look at the main file to find prefix and dependencies
(setq prefix (replace-regexp-in-string
"\\(-mode\\)?\\(-pkg\\)?\\'" ""
(file-name-sans-extension
(file-name-nondirectory package-lint-main-file))))
(let ((main-file package-lint-main-file))
(if (string-match-p "-pkg\\.el\\'" main-file)
(let ((expr (with-temp-buffer
(insert-file-contents (expand-file-name main-file))
(read (current-buffer)))))
(if (eq (car-safe expr) 'define-package)
(setq deps (package-desc-reqs (apply #'package-lint--package-desc-from-define (cdr expr))))
(package-lint--error-at-bob 'error (format "Malformed package descriptor file \"%s\"" main-file))))
(when (package-lint--goto-header "Package-Requires")
(package-lint--error-at-bol 'error "Package-Requires outside the main file have no effect."))
(package-lint--check-provide-form-secondary-file)
(condition-case err
(with-temp-buffer
(insert-file-contents (expand-file-name main-file))
(setq deps (package-desc-reqs (package-lint--liberal-package-buffer-info))))
(error
(package-lint--error-at-bob
'error
(format "Error parsing main package file \"%s\": %s" main-file err)))))))
;; Source code checks
(package-lint--check-keywords-list)
(package-lint--check-lexical-binding-is-on-first-line)
(package-lint--check-reserved-keybindings)
(when prefix
(package-lint--check-objects-by-regexp
(concat "(" (regexp-opt '("defalias" "defvaralias")) "\\s-")
(apply-partially #'package-lint--check-defalias prefix)))
(package-lint--check-objects-by-regexp
"(define-minor-mode\\s-"
#'package-lint--check-minor-mode)
(package-lint--check-objects-by-regexp
"(define-global\\(?:ized\\)?-minor-mode\\s-"
#'package-lint--check-globalized-minor-mode)
(package-lint--check-objects-by-regexp
"(defgroup\\s-" #'package-lint--check-defgroup)
(package-lint--check-no-use-of-cl)
(package-lint--check-no-use-of-cl-lib-sublibraries)
(package-lint--check-eval-after-load)
(package-lint--check-lexical-binding-requires-emacs-24 deps)
(package-lint--check-libraries-available-in-emacs deps)
(package-lint--check-libraries-removed-from-emacs)
(package-lint--check-macros-functions-available-in-emacs deps)
(package-lint--check-macros-functions-removed-from-emacs deps)
(package-lint--check-objects-by-regexp
(concat "(" (regexp-opt '("format" "message" "error")) "\\s-")
(apply-partially #'package-lint--check-format-string deps))
(package-lint--check-for-literal-emacs-path)
(let ((definitions (package-lint--get-defs)))
(package-lint--check-autoloads-on-private-functions definitions)
(when prefix
(package-lint--check-defs-prefix prefix definitions))
(package-lint--check-symbol-separators definitions)))
(package-lint--check-lonely-parens))))
(sort package-lint--errors
(lambda (a b)
(pcase-let ((`(,a-line ,a-column ,_ ,a-message) a)
(`(,b-line ,b-column ,_ ,b-message) b))
(cond
((/= a-line b-line) (< a-line b-line))
((/= a-column b-column) (< a-column b-column))
(t
(string-lessp a-message b-message))))))))
(defun package-lint--error (line col type message)
"Construct a datum for error at LINE and COL with TYPE and MESSAGE."
(push (list line col type message) package-lint--errors))
(defun package-lint--error-at-point (type message &optional pos)
"Construct a datum for error at POS with TYPE and MESSAGE.
POS defaults to `point'."
(save-excursion
(when pos
(goto-char pos))
(package-lint--error (line-number-at-pos) (- (point) (line-beginning-position)) type message)))
(defun package-lint--error-at-bol (type message)
"Construct an error at the beginning of the current line with TYPE and MESSAGE."
(package-lint--error (line-number-at-pos) 0 type message))
(defun package-lint--error-at-bob (type message)
"Construct an error at the beginning of the buffer with TYPE and MESSAGE."
(package-lint--error 1 0 type message))
;;; Checks
(defun package-lint--check-reserved-keybindings ()
"Warn about reserved keybindings."
(let ((re (rx "(" (*? space) (or "kbd" "global-set-key" "local-set-key" "define-key") symbol-end)))
(goto-char (point-min))
(while (re-search-forward re nil t)
(unless (nth 8 (save-match-data (syntax-ppss)))
;; Read form and get key-sequence
(goto-char (match-beginning 0))
(let ((seq (package-lint--extract-key-sequence
(read (current-buffer)))))
(when seq
(let ((message (package-lint--test-keyseq seq)))
(when message
(package-lint--error-at-point 'error message)))))))))
(defun package-lint--check-commentary-existence ()
"Warn about nonexistent or empty commentary section."
(let ((start (lm-commentary-start)))
(if (null start)
(package-lint--error-at-bob
'error
"Package should have a ;;; Commentary section.")
;; Skip over the section header.
(goto-char start)
(forward-line)
(when (package-lint--region-empty-p (point) (lm-commentary-end))
(package-lint--error-at-point
'error
"Package should have a non-empty ;;; Commentary section."
start)))))
(defun package-lint--check-autoloads-on-private-functions (definitions)
"Verify that private functions DEFINITIONS don't have autoload cookies."
(pcase-dolist (`(,symbol . ,position) definitions)
(when (string-match-p (rx "--") symbol)
(goto-char position)
(forward-line -1)
(when (looking-at-p (rx ";;;###autoload"))
(package-lint--error-at-point
'warning
"Private functions generally should not be autoloaded.")))))
(defun package-lint--check-for-literal-emacs-path ()
"Verify package does not refer to \"\.emacs\.d\" literally.
Instead it should use `user-emacs-directory' or `locate-user-emacs-file'."
(goto-char (point-min))
;; \b won't find a word boundary between a symbol and the "." in
;; ".emacs.d". / is a valid symbol constituent in Emacs Lisp, so
;; must be explicitly blacklisted.
(while (re-search-forward "\\(?:\\_<\\|/\\)\\.emacs\\.d\\b" nil t)
(unless (nth 4 (syntax-ppss))
;; Not in a comment
(package-lint--error-at-point
'warning
"Use variable `user-emacs-directory' or function `locate-user-emacs-file' instead of a literal path to the Emacs user directory or files."))))
(defun package-lint--check-keywords-list ()
"Verify that package keywords are listed in `finder-known-keywords'."
(when (package-lint--goto-header "Keywords")
(let ((err-pos (match-beginning 2)))
(let ((keywords (lm-keywords-list)))
(unless (cl-some (lambda (keyword) (assoc (intern keyword) finder-known-keywords)) keywords)
(package-lint--error-at-point
'warning
(format "You should include standard keywords: see the variable `finder-known-keywords'.")
err-pos))))))
(defun package-lint--check-url-header ()
"Verify that the package has an HTTPS or HTTP Homepage/URL header."
(if (package-lint--goto-header "\\(?:URL\\|Homepage\\)")
(let ((url (match-string 3))
(url-start (match-beginning 3)))
(when (string-match-p "^<.*>$" url)
(setq url (substring url 1 -1)
url-start (1+ url-start))
(backward-char 1))
(unless (and (equal (thing-at-point 'url) url)
(string-match-p "^https?://" url))
(package-lint--error-at-point
'error
"Package URLs should be a single HTTPS or HTTP URL."
url-start)))
(package-lint--error-at-bob
'error
"Package should have a Homepage or URL header.")))
(defun package-lint--check-dependency-list ()
"Check the contents of the \"Package-Requires\" header.
Return a list of well-formed dependencies, same as
`package-lint--check-well-formed-dependencies'."
(when (package-lint--goto-header "Package-Requires")
(let ((position (match-beginning 3))
(deps (match-string 3)))
(condition-case err
(pcase-let ((`(,parsed-deps . ,parse-end-pos) (read-from-string deps)))
(unless (= parse-end-pos (length deps))
(package-lint--error-at-bol
'error
"More than one expression provided."))
(let ((deps (package-lint--check-well-formed-dependencies position parsed-deps)))
(package-lint--check-emacs-version deps)
(package-lint--check-packages-installable deps)
(package-lint--check-deps-use-non-snapshot-version deps)
(package-lint--check-deps-do-not-use-zero-versions deps)
(package-lint--check-cl-lib-version deps)
deps))
(error
(package-lint--error-at-bol
'error
(format "Couldn't parse \"Package-Requires\" header: %s" (error-message-string err)))
nil)))))
(defun package-lint--check-well-formed-dependencies (position parsed-deps)
"Check that dependencies listed at POSITION are well-formed.
These PARSED-DEPS must have the format (name \"version\").
Return a list of well-formed dependencies, where each element is of
the form (PACKAGE-NAME PACKAGE-VERSION DEP-POSITION)."
(let (valid-deps)
(dolist (entry parsed-deps)
(pcase entry
((or (and `(,package-name ,package-version)
(guard (symbolp package-name))
(guard (stringp package-version)))
(and `(,package-name)
(guard (symbolp package-name)))
(and package-name
(guard (symbolp package-name))))
;; Find the column at which the dependency is declared so we can
;; properly report the position of errors.
(let ((dep-pos
(save-excursion
(goto-char position)
(let* ((symbol-pattern
(format "\\(%s\\)"
(regexp-quote (symbol-name package-name))))
(list-pattern
(format "( *%s\\(?:[^[:alnum:]_\\-].*?\\)?)"
symbol-pattern)))
(if (or (re-search-forward list-pattern (line-end-position) t)
(re-search-forward symbol-pattern (line-end-position) t))
(match-beginning 1)
position)))))
(unless package-version
(setq package-version "0"))
(if (ignore-errors (version-to-list package-version))
(push (list package-name
(version-to-list package-version)
dep-pos)
valid-deps)
(package-lint--error-at-point
'error
(format "%S is not a valid version string: see `version-to-list'."
package-version)
dep-pos))))
(_
(package-lint--error-at-bol
'error
(format "Expected (package-name \"version-num\"), but found %S." entry)))))
valid-deps))
(defun package-lint--check-package-installable (archive-entry package-version dep-pos)
"Check that ARCHIVE-ENTRY is installable from a configured package archive.
Check that package described by ARCHIVE-ENTRY can be installed at
required version PACKAGE-VERSION. If not, raise an error for DEP-POS."
(let* ((package-name (car archive-entry))
(best-version (package-lint--highest-installable-version-of package-name)))
(when (version-list-< best-version package-version)
(package-lint--error-at-point
'warning
(format "Version dependency for %s appears too high: try %s" package-name
(package-version-join best-version))
dep-pos))))
(defun package-lint--check-emacs-version (valid-deps)
"Check that all VALID-DEPS are available for installation."
(pcase-dolist (`(,package-name ,package-version ,dep-pos) valid-deps)
(when (eq 'emacs package-name)
(cond
((version-list-< package-version '(24))
(package-lint--error-at-point
'error
"You can only depend on Emacs version 24 or greater: package.el for Emacs 23 does not support the \"emacs\" pseudopackage."
dep-pos))
((version-list-<= package-lint-emacs-head-version package-version)
(package-lint--error-at-point
'warning
"This makes the package uninstallable in all released Emacs versions."
dep-pos))))))
(defun package-lint--check-packages-installable (valid-deps)
"Check that all VALID-DEPS are available for installation."
(pcase-dolist (`(,package-name ,package-version ,dep-pos) valid-deps)
(unless (eq 'emacs package-name)
(let ((archive-entry (append (assq package-name package-archive-contents)
(assq package-name package-alist))))
(if archive-entry
(package-lint--check-package-installable archive-entry package-version dep-pos)
(package-lint--error-at-point
'error
(format "Package %S is not installable." package-name)
dep-pos))))))
(defun package-lint--check-deps-use-non-snapshot-version (valid-deps)
"Warn about any VALID-DEPS on snapshot versions of packages."
(pcase-dolist (`(,package-name ,package-version ,dep-pos) valid-deps)
(unless (version-list-< package-version '(19001201 1))
(package-lint--error-at-point
'warning
(format "Use a non-snapshot version number for dependency on \"%S\" if possible."
package-name)
dep-pos))))
(defun package-lint--check-deps-do-not-use-zero-versions (valid-deps)
"Warn about VALID-DEPS on \"0\" versions of packages."
(pcase-dolist (`(,package-name ,package-version ,dep-pos) valid-deps)
(when (equal package-version '(0))
(package-lint--error-at-point
'warning
(format "Use a properly versioned dependency on \"%S\" if possible."
package-name)
dep-pos))))
(defun package-lint--check-lexical-binding-requires-emacs-24 (valid-deps)
"Warn about use of `lexical-binding' when Emacs 24.1 is not among VALID-DEPS."
(goto-char (point-min))
(when (package-lint--lexical-binding-declared-in-header-line-p)
(unless (assq 'emacs valid-deps)
(package-lint--error-at-point
'warning
"You should depend on (emacs \"24.1\") if you need lexical-binding."
(match-beginning 1)))))
(defun package-lint--inside-comment-or-string-p ()
"Return non-nil if point is inside a comment or string."
(let ((ppss (save-match-data (syntax-ppss))))
(or (nth 3 ppss) (nth 4 ppss))))
(defun package-lint--seen-fboundp-check-for (sym)
"Return non-nil if a `fboundp' check for SYM is present before point."
(save-excursion
(save-match-data
(and (re-search-backward
(concat "(" (regexp-opt '("fboundp" "macrop")) "\\s-+#?'" (regexp-quote sym) "\\_>") (point-min) t)
(not (package-lint--inside-comment-or-string-p))))))
(defun package-lint--map-regexp-match (regexp callback)
"For every match of REGEXP, call CALLBACK with the first match group.
If callback returns non-nil, the return value - which must be a
list - will be applied to `package-lint--error-at-point'. If
REGEXP doesn't produce a match group 1, then match group
0 (ie. the whole match string string) will be passed to
CALLBACK."
(save-excursion
(goto-char (point-min))
(while (re-search-forward regexp nil t)
(let ((sym (or (match-string-no-properties 1)
(match-string-no-properties 0))))
(save-excursion
(goto-char (or (match-beginning 1)
(match-beginning 0)))
(let ((err (funcall callback sym)))
(when err
;; Check this as late as possible, just before reporting,
;; because otherwise the checking process is extremely slow,
;; being bottlenecked by `syntax-ppss'.
(unless (package-lint--inside-comment-or-string-p)
(apply #'package-lint--error-at-point err)))))))))
(defun package-lint--quick-up-list ()
(if (eq ?\( (char-before))
(backward-char 1)
(backward-up-list)))
(defun package-lint--is-a-let-binding ()
"Return non-nil if point is on a symbol being introduced by a let binding."
(let ((binding-pat (rx "(" (or "let" "let*" "cl-let") symbol-end)))
(condition-case _
(save-excursion
(save-match-data
(let ((was-first (eq ?\( (char-before))))
(package-lint--quick-up-list)
(package-lint--quick-up-list)
(or (looking-at binding-pat)
(when was-first
(package-lint--quick-up-list)
(looking-at binding-pat))))))
(scan-error nil))))
(defun package-lint--check-version-regexp-list (valid-deps symbol-regexp type)
"Warn if symbols matched by SYMBOL-REGEXP are unavailable in the target Emacs.
The target Emacs version is taken from VALID-DEPS, which are the
declared dependencies of this package. TYPE is the
type of the symbol, either FUNCTION or FEATURE."
(let ((emacs-version-dep (or (cadr (assq 'emacs valid-deps)) '(0))))
(package-lint--map-regexp-match
symbol-regexp
(lambda (sym)
(let-alist (package-lint-symbol-info sym)
(let ((added-in-version (pcase type
(`function .function-added)
(`feature .library-added))))
(when (and added-in-version (version-list-< emacs-version-dep added-in-version))
(let* ((available-backport-with-ver
(pcase type
(`feature
(cl-some (lambda (bp)
(when (string= (car bp) sym)
(or (cddr bp)
(list (car bp)))))
package-lint-backport-libraries))
(`function
(cl-some (lambda (bp)
(when (string-match-p (nth 1 bp) sym)
(or (cddr bp)
(list (car bp)))))
package-lint-backport-libraries))))
(available-backport (car available-backport-with-ver))
(required-backport-version (cadr available-backport-with-ver))
(matching-dep (when available-backport
(assoc available-backport valid-deps)))
(compat-support (package-lint--supported-by-compat type (intern sym)))
(compat-in-deps (assoc 'compat valid-deps)))
(unless (or
(and compat-support compat-in-deps)
(and matching-dep
(or (not required-backport-version)
(version-list-<= (version-to-list required-backport-version)
(cadr matching-dep))))
(and (eq type 'function)
(or (package-lint--seen-fboundp-check-for sym)
(package-lint--is-a-let-binding))))
(list
'error
(format "You should depend on (emacs \"%s\")%s%s if you need `%s'."
(mapconcat #'number-to-string added-in-version ".")
(if available-backport
(format " or the %s package"
(if required-backport-version
(format "(%s \"%s\")"
available-backport
required-backport-version)
available-backport))
"")
(if compat-support " or the compat package" "")
sym)))))))))))
(defun package-lint--check-eval-after-load ()
"Warn about use of `eval-after-load' and co."
(package-lint--map-regexp-match
"(\\s-*?\\(\\(?:with-\\)?eval-after-load\\)\\_>"
(lambda (match)
(list 'warning
(format "`%s' is for use in configurations, and should rarely be used in packages." match)))))
(defun package-lint--check-no-use-of-cl ()
"Warn about use of deprecated `cl' library."
(package-lint--map-regexp-match
"(\\s-*?require\\s-*?'\\(cl\\)\\_>"
(lambda (_)
(list
'warning
"Replace deprecated `cl' with `cl-lib'. The `cl-libify' package can help with this."))))
(defun package-lint--check-no-use-of-cl-lib-sublibraries ()
"Warn about use of `cl-macs', `cl-seq' etc."
(package-lint--map-regexp-match
"(\\s-*?require\\s-*?'\\(cl-macs\\|cl-seq\\)\\_>"
(lambda (_)
(list
'warning
"This file is not in the `cl-lib' ELPA compatibility package: require `cl-lib' instead."))))
(defconst package-lint--unconditional-require-regexp
;; Match the ending paren so we can be sure it's a single argument
;; `require'. If there are additional arguments, we don't want to warn,
;; because (require 'foo nil t) indicates an optional dependency and
;; (require 'foo "filename") is very uncommon.
"(\\s-*?require\\s-*?'\\_<\\(.*?\\)\\_>\\s-*?)"
"Regexp to match unconditional `require' forms.")
(defun package-lint--check-libraries-available-in-emacs (valid-deps)
"Warn about use of libraries that are not available.
The check is performed against the Emacs version in VALID-DEPS."
(package-lint--check-version-regexp-list
valid-deps
package-lint--unconditional-require-regexp
'feature))
(defun package-lint--check-libraries-removed-from-emacs ()
"Warn about use of libraries that have been removed from Emacs."
(package-lint--map-regexp-match
package-lint--unconditional-require-regexp
(lambda (sym)
(let-alist (package-lint-symbol-info sym)
(let ((removed-in-version .library-removed))
(when removed-in-version
(list
'error
(format "The `%s' library was removed in Emacs version %s."
sym (mapconcat #'number-to-string removed-in-version ".")))))))))
(defconst package-lint--function-name-regexp
(rx
(seq
(or "#'"
(seq "(" (* (syntax whitespace))
(? (seq
(or "funcall" "apply" "advice-add")
(+
(syntax whitespace))
"'"))))
(group
(*\? nonl))
symbol-end))
"Regexp to match function names.")
(defun package-lint--check-macros-functions-available-in-emacs (valid-deps)
"Warn about use of unavailable functions/macros that are not available.
The check is performed against the Emacs version in VALID-DEPS."
(package-lint--check-version-regexp-list
valid-deps
package-lint--function-name-regexp
'function))
(defun package-lint--check-macros-functions-removed-from-emacs (valid-deps)
"Warn about use of functions/macros that have been removed from Emacs.
If an Emacs version is specified in VALID-DEPS, don't warn about
functions/macros that were removed and later re-added, as long as
the Emacs dependency matches the re-addition."
(package-lint--map-regexp-match
package-lint--function-name-regexp
(lambda (sym)
(let-alist (package-lint-symbol-info sym)
(let ((removed-in-version .function-removed))
(when removed-in-version
(let ((emacs-version-dep (or (cadr (assq 'emacs valid-deps)) '(0))))
(unless (or (package-lint--seen-fboundp-check-for sym)
(and .function-added (version-list-<= .function-added emacs-version-dep)))
(list
'error
(format "`%s' was removed in Emacs version %s."
sym (mapconcat #'number-to-string removed-in-version ".")))))))))))
(defun package-lint--check-lexical-binding-is-on-first-line ()
"Check that any `lexical-binding' declaration is on the first line of the file."
(cl-block return
(let ((original-buffer (current-buffer)))
(with-temp-buffer
(let ((lexical-binding-found-at-end nil))
(insert-buffer-substring-no-properties original-buffer)
(condition-case err
(cl-letf (((symbol-function #'hack-local-variables-apply) #'ignore)
((symbol-function #'hack-local-variables-filter)
(lambda (variables _dir-name)
(setq file-local-variables-alist variables)))
;; Silence any messages Emacs may want to share with the user.
;; There's no user.
((symbol-function #'display-warning) #'ignore)
((symbol-function #'message) #'ignore))
;; HACK: this is an internal variable!
;; Unfortunately, Emacsen that have this variable also have
;; `hack-local-variables' that doesn't store `lexical-binding'
;; in `file-local-variables-alist'.
(defvar enable-dir-local-variables)
(defvar hack-local-variables--warned-lexical)
(let ((hack-local-variables--warned-lexical nil)
(enable-dir-local-variables nil)
(enable-local-variables t)
(local-enable-local-variables t))
(hack-local-variables)
(setq lexical-binding-found-at-end
hack-local-variables--warned-lexical)))
(error
(package-lint--error-at-bob 'error (error-message-string err))
(cl-return-from return nil)))
(when (or lexical-binding-found-at-end
;; In case this is an Emacs from before `hack-local-variables'
;; started to warn about `lexical-binding' on a line other
;; than the first.
(and (cdr (assq 'lexical-binding file-local-variables-alist))
(not (package-lint--lexical-binding-declared-in-header-line-p))))
(package-lint--error-at-bob
'error
"`lexical-binding' must be set in the first line.")))))))
(defun package-lint--check-cl-lib-version (valid-deps)
"Check dependencies in VALID-DEPS on \"cl-lib\".
The specified versions must be remotely available for installation."
(let ((emacs-version-dep (or (nth 1 (assq 'emacs valid-deps)) '(0)))
(cl-lib-dep (assq 'cl-lib valid-deps)))
(when cl-lib-dep
(let ((cl-lib-version (nth 1 cl-lib-dep)))
(cond ((and emacs-version-dep
(version-list-<= '(24 3) emacs-version-dep)
(version-list-<= cl-lib-version '(1 0)))
(package-lint--error-at-point
'warning
"An explicit dependency on cl-lib <= 1.0 is not needed on Emacs >= 24.3."))
((version-list-<= '(1) cl-lib-version)
(package-lint--error-at-point
'error
(format "Depend on the latest 0.x version of cl-lib rather than on version \"%S\".
Alternatively, depend on (emacs \"24.3\") or greater, in which cl-lib is bundled."
cl-lib-version)
(nth 2 cl-lib-dep))))))))
(defun package-lint--check-package-version-present ()
"Check that a valid \"Version\" header is present."
(let ((version (package-lint--goto-header (rx (? "Package-") "Version"))))
(if version
(unless (ignore-errors (version-to-list version))
(package-lint--error-at-point
'warning
(format "\"%s\" is not a valid version. MELPA will handle this, but other archives will not." version)
(match-beginning 3)))
(package-lint--error-at-bob
'warning
"\"Version:\" or \"Package-Version:\" header is missing. MELPA will handle this, but other archives will not."))))
(defun package-lint--liberal-package-buffer-info ()
"Like `package-buffer-info', but tolerate missing version header."
(let ((orig-buffer (current-buffer)))
;; We've reported version header issues separately, so rule them out here
(with-temp-buffer
(insert-buffer-substring-no-properties orig-buffer)
(goto-char (point-min))
(package-lint--update-or-insert-version "0")
(let ((info (package-buffer-info)))
;; Pedantically check for the footer comment
;; In Emacs 29 this became a soft failure, but for packages to
;; be installable with the package.el in older Emacsen, the
;; footer comment must be there nonetheless.
(goto-char (point-min))
(search-forward (format ";;; %s.el ends here" (package-lint--package-desc-name info)))
info))))
(defun package-lint--check-package-el-can-parse ()
"Check that `package-buffer-info' can read metadata from this file.
If it can, return the read metadata."
(condition-case err
(package-lint--liberal-package-buffer-info)
(error
(package-lint--error-at-bob
'error
(format "package.el cannot parse this buffer: %s" (error-message-string err)))
nil)))
(defun package-lint--check-package-summary (desc)
"Check the summary for package with descriptor DESC.
DESC is a struct as returned by `package-buffer-info'."
(let ((summary (package-lint--package-desc-summary desc)))
(cond
((string= summary "")
(package-lint--error-at-bob
'error
"Package should have a non-empty summary."))
(t
(unless (let ((case-fold-search nil))
(string-match-p "^[A-Z0-9]" summary))
(package-lint--error-at-bob
'warning
"The package summary should start with an uppercase letter or a digit."))
(when (> (length summary) 60)
(package-lint--error-at-bob
'warning
"The package summary is too long. It should be at most 60 characters."))
(when (string-match "\\.\\'" summary)
(package-lint--error-at-bob
'warning
"The package summary should not end with a period."))
(when (save-match-data
(let ((case-fold-search t))
(and (string-match "[^.]\\<emacs\\>" summary)
(not (string-match-p "[[:space:]]+lisp"
summary (match-end 0))))))
(package-lint--error-at-bob
'warning
"Including \"Emacs\" in the package summary is usually redundant."))))))
(defun package-lint--check-provide-form (desc)
"Check the provide form for package with descriptor DESC.
DESC is a struct as returned by `package-buffer-info'."
(let ((name (symbol-name (package-lint--package-desc-name desc))))
(if (string-match-p "-theme\\'" name)
(let ((theme-name (replace-regexp-in-string "-theme\\'" "" name))
(provided-theme (package-lint--provided-theme)))
(unless (string-equal theme-name provided-theme)
(package-lint--error-at-bob
'error
(format "There is no (provide-theme '%s) form." theme-name))))
(let ((feature (package-lint--provided-feature)))
(unless (string-equal name feature)
(package-lint--error-at-bob
'error
(format "There is no (provide '%s) form." name)))))))
(defun package-lint--check-provide-form-secondary-file ()
"Check there is a provide form."
;; We don't require that the provided feature have a name consistent
;; with the overall package prefix, but this check may later be added.
(unless (package-lint--provided-feature)
(package-lint--error-at-bob
'error
"There is no `provide' form.")))
(defun package-lint--check-no-emacs-in-package-name (desc)
"Check that the package name doesn't contain \"emacs\".
DESC is a struct as returned by `package-buffer-info'."
(let ((name (package-lint--package-desc-name desc)))
(when (string-match-p "emacs" (symbol-name name))
(package-lint--error-at-bob
'warning
"The word \"emacs\" is redundant in Emacs package names."))))
(defun package-lint--check-symbol-separators (definitions)
"Check that symbol DEFINITIONS don't contain non-standard separators."
(pcase-dolist (`(,name . ,position) definitions)
(when (and (string-match "[:/]" name)
(not (string-match-p package-lint--sane-prefixes name)))
(let ((match-pos (match-beginning 0)))
;; As a special case, allow `/=' or `/' when at the end of a symbol.
(when (or (not (string-match (rx "/" (optional "=") string-end) name))
(/= match-pos (match-beginning 0)))
(goto-char position)
(package-lint--error
(line-number-at-pos) 0 'error
(format "`%s' contains a non-standard separator `%s', use hyphens instead (see Elisp Coding Conventions)."
name (substring-no-properties name match-pos (1+ match-pos)))))))))
(defun package-lint--valid-prefix-mapping-p (short-prefix prefix name)
"Check if NAME corresponds to a valid mappings for PREFIX.
Check is done according to the definitions in
`package-lint--allowed-prefix-mappings' for SHORT-PREFIX."
(let ((regexp (concat "^" (regexp-opt
(cdr (assoc short-prefix package-lint--allowed-prefix-mappings))))))
(string-prefix-p prefix (replace-regexp-in-string regexp short-prefix name))))
(defun package-lint--valid-definition-name-p (name prefix &optional position)
"Return non-nil if NAME denotes a valid definition name.
Valid definition names are:
- a NAME starting with PREFIX, a string representing the current
package prefix,
- a NAME matching `package-lint--sane-prefixes', or
- a NAME whose POSITION in the buffer denotes a global definition."
(or (string-prefix-p prefix name)
(string-match-p package-lint--sane-prefixes name)
(string-match-p (rx-to-string `(seq string-start (or "define" "defun" "defvar" "defface" "with") "-" ,prefix)) name)
(string-match-p (rx-to-string `(seq string-start "global-" ,prefix (or "-mode" (seq "-" (* any) "-mode")) string-end)) name)
(let ((short-prefix (car (cl-remove-if-not (lambda (e) (string-prefix-p e prefix))
(mapcar #'car package-lint--allowed-prefix-mappings)))))
(when short-prefix
(package-lint--valid-prefix-mapping-p short-prefix prefix name)))
(when position
(goto-char position)
(looking-at-p (rx (*? space) "(" (*? space)
(or "defadvice" "cl-defmethod" "define-advice" "defalias" "defvaralias" (seq "define-obsolete-" (or "face" "function" "variable") "-alias"))
symbol-end)))))
(defun package-lint--check-defs-prefix (prefix definitions)
"Verify that symbol DEFINITIONS start with package PREFIX."