;;; cider-buck.el --- Cider + Buck = Love            -*- lexical-binding: t; -*-

;; Copyright (C) 2019  John Doty

;; Author: doty <doty@fb.com>
;; Keywords: languages, clojure, cider

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This is just a bunch of funcitons to make cider work well with a buck
;; project.

;;; Code:

(defun cider-buck--nrepl-target ()
  "Get the nrepl buck target of the specified file name."
  (let ((src-file (file-local-name (buffer-file-name (current-buffer)))))
    (prin1 src-file)
    (with-temp-buffer
      (let ((status (process-file "buck" nil (current-buffer) nil
                                  "query" "owner('%s')" src-file)))
        (unless (eq status 0)
          (error (buffer-string)))

        (goto-char (point-min))
        (while (re-search-forward "__source-java[0-9]+$" nil t)
          (replace-match "_nrepl"))

        (goto-char (point-min))
        (buffer-substring (point-min) (line-end-position))))))

(defun cider-buck--jack-in-cmd ()
  "Get it."
  (concat "buck run " (cider-buck--nrepl-target) " -- --middleware '["
          (mapconcat (apply-partially #'format "\"%s\"")
                     (cider-jack-in-normalized-nrepl-middlewares)
                     ", ")
          "]'"))

(defun cider-buck--project-dir ()
  "Get the project dir by looking for a targets file."
  (locate-dominating-file (buffer-file-name (current-buffer)) "TARGETS"))

(defun cider-buck-jack-in ()
  "Start an nREPL server for the current file and connect to it."
  (interactive)
  (nrepl-start-server-process
   (cider-buck--project-dir)
   (cider-buck--jack-in-cmd)
   (lambda (server-buffer)
     (cider-connect-sibling-clj () server-buffer))))


(provide 'cider-buck)
;;; cider-buck.el ends here