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+;;; company-eclim.el --- company-mode completion backend for Eclim
+
+;; Copyright (C) 2009, 2011, 2013, 2015  Free Software Foundation, Inc.
+
+;; Author: Nikolaj Schumacher
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Using `emacs-eclim' together with (or instead of) this backend is
+;; recommended, as it allows you to use other Eclim features.
+;;
+;; The alternative backend provided by `emacs-eclim' uses `yasnippet'
+;; instead of `company-template' to expand function calls, and it supports
+;; some languages other than Java.
+
+;;; Code:
+
+(require 'company)
+(require 'company-template)
+(require 'cl-lib)
+
+(defgroup company-eclim nil
+  "Completion backend for Eclim."
+  :group 'company)
+
+(defun company-eclim-executable-find ()
+  (let (file)
+    (cl-dolist (eclipse-root '("/Applications/eclipse" "/usr/lib/eclipse"
+                            "/usr/local/lib/eclipse"))
+      (and (file-exists-p (setq file (expand-file-name "plugins" eclipse-root)))
+           (setq file (car (last (directory-files file t "^org.eclim_"))))
+           (file-exists-p (setq file (expand-file-name "bin/eclim" file)))
+           (cl-return file)))))
+
+(defcustom company-eclim-executable
+  (or (bound-and-true-p eclim-executable)
+      (executable-find "eclim")
+      (company-eclim-executable-find))
+  "Location of eclim executable."
+  :type 'file)
+
+(defcustom company-eclim-auto-save t
+  "Determines whether to save the buffer when retrieving completions.
+eclim can only complete correctly when the buffer has been saved."
+  :type '(choice (const :tag "Off" nil)
+                 (const :tag "On" t)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar-local company-eclim--project-dir 'unknown)
+
+(defvar-local company-eclim--project-name nil)
+
+(declare-function json-read "json")
+(defvar json-array-type)
+
+(defun company-eclim--call-process (&rest args)
+  (let ((coding-system-for-read 'utf-8)
+        res)
+    (require 'json)
+    (with-temp-buffer
+      (if (= 0 (setq res (apply 'call-process company-eclim-executable nil t nil
+                                "-command" args)))
+          (let ((json-array-type 'list))
+            (goto-char (point-min))
+            (unless (eobp)
+              (json-read)))
+        (message "Company-eclim command failed with error %d:\n%s" res
+                 (buffer-substring (point-min) (point-max)))
+        nil))))
+
+(defun company-eclim--project-list ()
+  (company-eclim--call-process "project_list"))
+
+(defun company-eclim--project-dir ()
+  (if (eq company-eclim--project-dir 'unknown)
+      (let ((dir (locate-dominating-file buffer-file-name ".project")))
+        (when dir
+          (setq company-eclim--project-dir
+                (directory-file-name
+                 (expand-file-name dir)))))
+    company-eclim--project-dir))
+
+(defun company-eclim--project-name ()
+  (or company-eclim--project-name
+      (let ((dir (company-eclim--project-dir)))
+        (when dir
+          (setq company-eclim--project-name
+                (cl-loop for project in (company-eclim--project-list)
+                         when (equal (cdr (assoc 'path project)) dir)
+                         return (cdr (assoc 'name project))))))))
+
+(defun company-eclim--candidates (prefix)
+  (interactive "d")
+  (let ((project-file (file-relative-name buffer-file-name
+                                          (company-eclim--project-dir)))
+        completions)
+    (when company-eclim-auto-save
+      (when (buffer-modified-p)
+        (basic-save-buffer))
+      ;; FIXME: Sometimes this isn't finished when we complete.
+      (company-eclim--call-process "java_src_update"
+                                   "-p" (company-eclim--project-name)
+                                   "-f" project-file))
+    (dolist (item (cdr (assoc 'completions
+                              (company-eclim--call-process
+                               "java_complete" "-p" (company-eclim--project-name)
+                               "-f" project-file
+                               "-o" (number-to-string
+                                     (company-eclim--search-point prefix))
+                               "-e" "utf-8"
+                               "-l" "standard"))))
+      (let* ((meta (cdr (assoc 'info item)))
+             (completion meta))
+        (when (string-match " ?[(:-]" completion)
+          (setq completion (substring completion 0 (match-beginning 0))))
+        (put-text-property 0 1 'meta meta completion)
+        (push completion completions)))
+    (let ((completion-ignore-case nil))
+      (all-completions prefix completions))))
+
+(defun company-eclim--search-point (prefix)
+  (if (or (cl-plusp (length prefix)) (eq (char-before) ?.))
+      (1- (point))
+    (point)))
+
+(defun company-eclim--meta (candidate)
+  (get-text-property 0 'meta candidate))
+
+(defun company-eclim--annotation (candidate)
+  (let ((meta (company-eclim--meta candidate)))
+    (when (string-match "\\(([^-]*\\) -" meta)
+      (substring meta (match-beginning 1) (match-end 1)))))
+
+(defun company-eclim--prefix ()
+  (let ((prefix (company-grab-symbol)))
+    (when prefix
+      ;; Completion candidates for annotations don't include '@'.
+      (when (eq ?@ (string-to-char prefix))
+        (setq prefix (substring prefix 1)))
+      prefix)))
+
+(defun company-eclim (command &optional arg &rest ignored)
+  "`company-mode' completion backend for Eclim.
+Eclim provides access to Eclipse Java IDE features for other editors.
+
+Eclim version 1.7.13 or newer (?) is required.
+
+Completions only work correctly when the buffer has been saved.
+`company-eclim-auto-save' determines whether to do this automatically."
+  (interactive (list 'interactive))
+  (cl-case command
+    (interactive (company-begin-backend 'company-eclim))
+    (prefix (and (derived-mode-p 'java-mode 'jde-mode)
+                 buffer-file-name
+                 company-eclim-executable
+                 (company-eclim--project-name)
+                 (not (company-in-string-or-comment))
+                 (or (company-eclim--prefix) 'stop)))
+    (candidates (company-eclim--candidates arg))
+    (meta (company-eclim--meta arg))
+    ;; because "" doesn't return everything
+    (no-cache (equal arg ""))
+    (annotation (company-eclim--annotation arg))
+    (post-completion (let ((anno (company-eclim--annotation arg)))
+                       (when anno
+                         (insert anno)
+                         (company-template-c-like-templatify anno))))))
+
+(provide 'company-eclim)
+;;; company-eclim.el ends here