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Add new function file-name-with-extension

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* doc/lispref/files.texi (File Name Components): Document it.
* lisp/emacs-lisp/shortdoc.el (file-name): Ditto.

* lisp/files.el (file-name-with-extension): New function.
This commit is contained in:
Colin Woodbury 2021-06-30 14:07:29 +02:00 • committed by Lars Ingebrigtsen
parent 1dba0ca278
commit 4f2765f6f1
5 changed files with 66 additions and 0 deletions
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18
test/lisp/files-tests.el
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@ -1478,5 +1478,23 @@ The door of all subtleties!
(buffer-substring (point-min) (point-max))
nil nil)))))
(ert-deftest files-tests-file-name-with-extension-good ()
"Test that `file-name-with-extension' succeeds with reasonable input."
(should (string= (file-name-with-extension "Jack" "css") "Jack.css"))
(should (string= (file-name-with-extension "Jack" ".css") "Jack.css"))
(should (string= (file-name-with-extension "Jack.scss" "css") "Jack.css"))
(should (string= (file-name-with-extension "/path/to/Jack.md" "org") "/path/to/Jack.org")))
(ert-deftest files-tests-file-name-with-extension-bad ()
"Test that `file-name-with-extension' fails on malformed input."
(should-error (file-name-with-extension nil nil))
(should-error (file-name-with-extension "Jack" nil))
(should-error (file-name-with-extension nil "css"))
(should-error (file-name-with-extension "" ""))
(should-error (file-name-with-extension "" "css"))
(should-error (file-name-with-extension "Jack" ""))
(should-error (file-name-with-extension "Jack" "."))
(should-error (file-name-with-extension "/is/a/directory/" "css")))
(provide 'files-tests)
;;; files-tests.el ends here