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feat(lib): backport find-sibling-file

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I will slowly phase out projectile in favor of project.el, starting with
projectile-find-other-file, which -- as of Emacs 29 -- has a native
alternative: `find-sibling-file`.

Ref: doomemacs/community#1
This commit is contained in:
Henrik Lissner 2024-03-10 20:43:52 -04:00
parent 3b405c8d81
commit 198fe82b6d
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5 changed files with 77 additions and 9 deletions
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72
lisp/lib/files.el
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@ -527,5 +527,77 @@ If FORCE-P, overwrite the destination file if it exists, without confirmation."
(recentf-save-list)
(message "Removed %S from `recentf-list'" (abbreviate-file-name file)))
;;
;;; Backports
;; Introduced in Emacs 29.
;;;###autoload
(eval-when! (not (fboundp 'find-sibling-file))
(defvar find-sibling-rules nil)
(defun find-sibling-file (file)
"Visit a \"sibling\" file of FILE.
When called interactively, FILE is the currently visited file.
The \"sibling\" file is defined by the `find-sibling-rules' variable."
(interactive (progn
(unless buffer-file-name
(user-error "Not visiting a file"))
(list buffer-file-name)))
(unless find-sibling-rules
(user-error "The `find-sibling-rules' variable has not been configured"))
(let ((siblings (find-sibling-file-search (expand-file-name file)
find-sibling-rules)))
(cond
((null siblings)
(user-error "Couldn't find any sibling files"))
((length= siblings 1)
(find-file (car siblings)))
(t
(let ((relatives (mapcar (lambda (sibling)
(file-relative-name
sibling (file-name-directory file)))
siblings)))
(find-file
(completing-read (format-prompt "Find file" (car relatives))
relatives nil t nil nil (car relatives))))))))
(defun find-sibling-file-search (file &optional rules)
"Return a list of FILE's \"siblings\".
RULES should be a list on the form defined by `find-sibling-rules' (which
see), and if nil, defaults to `find-sibling-rules'."
(let ((results nil))
(pcase-dolist (`(,match . ,expansions) (or rules find-sibling-rules))
;; Go through the list and find matches.
(when (string-match match file)
(let ((match-data (match-data)))
(dolist (expansion expansions)
(let ((start 0))
;; Expand \\1 forms in the expansions.
(while (string-match "\\\\\\([&0-9]+\\)" expansion start)
(let ((index (string-to-number (match-string 1 expansion))))
(setq start (match-end 0)
expansion
(replace-match
(substring file
(elt match-data (* index 2))
(elt match-data (1+ (* index 2))))
t t expansion)))))
;; Then see which files we have that are matching. (And
;; expand from the end of the file's match, since we might
;; be doing a relative match.)
(let ((default-directory (substring file 0 (car match-data))))
;; Keep the first matches first.
(setq results
(nconc
results
(mapcar #'expand-file-name
(file-expand-wildcards expansion nil t)))))))))
;; Delete the file itself (in case it matched), and remove
;; duplicates, in case we have several expansions and some match
;; the same subsets of files.
(delete file (delete-dups results)))))
(provide 'doom-lib '(files))
;;; files.el ends here