From 044bf06af94ea9f45029161ee631ac559d0945f2 Mon Sep 17 00:00:00 2001
From: Nikolaj Schumacher <git@nschum.de>
Date: Thu, 19 Mar 2009 14:03:46 +0100
Subject: [PATCH] Speed up line replacement.

---
 company-gtags.el | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 company.el       |  6 ++--
 2 files changed, 74 insertions(+), 3 deletions(-)
 create mode 100644 company-gtags.el

diff --git a/company-gtags.el b/company-gtags.el
new file mode 100644
index 000000000..607ae3918
--- /dev/null
+++ b/company-gtags.el
@@ -0,0 +1,71 @@
+;;; company-gtags.el --- a company-mode completion back-end for GNU Global
+;;
+;; Copyright (C) 2009 Nikolaj Schumacher
+;;
+;; This file is part of company.
+;;
+;; 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 2
+;; 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 <http://www.gnu.org/licenses/>.
+
+(require 'company)
+(eval-when-compile (require 'cl))
+
+(defcustom company-gtags-gnu-global-program-name
+  (or (locate-file "global" exec-path exec-suffixes 'file-executable-p)
+      "global")
+  "*"
+  :type 'string
+  :group 'company)
+
+(defvar company-gtags-symbol-regexp
+  "\\_<[A-Za-z_][A-Za-z_0-9]*\\_>")
+
+(defvar company-gtags-modes '(c-mode c++-mode jde-mode java-mode php-mode))
+
+(defvar company-gtags-available 'unknown)
+(make-variable-buffer-local 'company-gtags-available)
+
+(defun company-gtags-available ()
+  (when (eq company-gtags-available 'unknown)
+    (condition-case err
+        (setq company-gtags-available
+              (= 0 (call-process company-gtags-gnu-global-program-name
+                                 nil nil nil "-c" "WHATEVER")))
+      (error
+       (message "Company: GNU Global not found")
+       (setq-default company-gtags-available nil))))
+  company-gtags-available)
+
+(defun company-gtags-fetch-tags (prefix)
+  (with-temp-buffer
+    (let (tags)
+      (when (= 0 (call-process "global" nil (list (current-buffer) nil)
+                               nil "-c" prefix))
+        (goto-char (point-min))
+        (while (looking-at company-gtags-symbol-regexp)
+          (push (match-string-no-properties 0) tags)
+          (forward-line)))
+      (nreverse tags))))
+
+(defun company-gtags (command &optional arg &rest ignored)
+  (case command
+    ('prefix (and (memq major-mode company-gtags-modes)
+                  (company-gtags-available)
+               (or (company-grab company-gtags-symbol-regexp) "")))
+    ('candidates (company-gtags-fetch-tags arg))
+    ('sorted t)))
+
+(provide 'company-gtags)
+;;; company-gtags.el ends here
+
+
diff --git a/company.el b/company.el
index 45a94d808..628ced934 100644
--- a/company.el
+++ b/company.el
@@ -132,7 +132,7 @@
                          (function :tag "custom function" nil))))
 
 (defcustom company-backends '(company-elisp company-nxml company-css
-                              company-semantic company-oddmuse
+                              company-semantic company-gtags company-oddmuse
                               company-files company-dabbrev)
   "*"
   :group 'company
@@ -748,7 +748,7 @@
       (push (buffer-substring beg end) lines))
     (nreverse lines)))
 
-(defun company-modify-line (old new offset)
+(defsubst company-modify-line (old new offset)
   (concat (company-safe-substring old 0 offset)
           new
           (company-safe-substring old (+ offset (length new)))))
@@ -760,7 +760,7 @@
       (push (company-modify-line (pop old) (pop lines) column) new))
     ;; Append whole new lines.
     (while lines
-      (push (company-modify-line "" (pop lines) column) new))
+      (push (concat (company-space-string column) (pop lines)) new))
     (concat (when nl "\n")
             (mapconcat 'identity (nreverse new) "\n")
             "\n")))
-- 
2.39.2