Jay Fields is a software developer at DRW Trading. He has a passion for discovering and maturing innovative solutions. His most recent work has been in the Domain Specific Language space where he's delivered applications that empowered subject matter experts to write the business rules of the applications. He is also very interested in maturing software design through software testing. Jay is a DZone MVB and is not an employee of DZone and has posted 116 posts at DZone. You can read more from them at their website. View Full User Profile

Elisp: Automated Switching Between Clojure Test and Source Files

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 The majority of the work that I do in emacs is Clojure programming. The Clojure navigation support (M-.) is usually all I need, but one thing that I find myself doing manually fairly often is jumping between tests and source. After suffering manual navigation for a few days, I finally automated the task using the Elisp from this blog entry.

All of my Clojure projects use both Leiningen and expectations; therefore, my directory structures always look similar to what you see below.

source - /Users/jfields/src/project-name/src/clojure/ tests - /Users/jfields/src/project-name/test/clojure/expectations/

Since my projects follow this convention, I'm able to make several assumptions about where the expectations and where the source will actually live. If you don't use expectations, or you follow a slightly different directory structure, you'll want to hack this a bit to follow your conventions.

If you're in a source file, find (and open) the expectations.
(defun test-full-path (project-root test-home)
    (concat (expand-file-name project-root) "src/clojure")
    (concat project-root test-home)
    (file-name-sans-extension (buffer-file-name)))

(defun find-expectations ()
  (let* ((project-root (locate-dominating-file
                         (file-name-directory (buffer-file-name)) "project.clj")))
    (if project-root
        (let* ((full-path-with-clojure (test-full-path project-root
          (if (file-exists-p full-path-with-clojure)
              (set-window-buffer (next-window) (find-file-noselect full-path-with-clojure))
            (message (concat "cound not find " full-path-with-clojure))))
      (message (concat "no project.clj found at or below " (buffer-file-name))))))

If you're in a test file, find (and open) the source.
(defun src-full-path (project-root file-name)
    (concat (expand-file-name project-root) "test/clojure/expectations")
    (concat project-root "src/clojure")
    (file-name-directory file-name))
    (file-name-nondirectory file-name))))

(defun find-src ()
  (let* ((project-root (locate-dominating-file
                         (file-name-directory (buffer-file-name)) "project.clj")))
    (if project-root
        (let* ((full-path (src-full-path project-root (buffer-file-name))))
          (if (file-exists-p full-path)
              (set-window-buffer (next-window) (find-file-noselect full-path))
            (message (concat "cound not find " full-path))))
      (message (concat "no project.clj found at or below " (buffer-file-name))))))

Published at DZone with permission of Jay Fields, author and DZone MVB. (source)

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