my-emacs-d/elpa/company-0.8.2/company-cmake.el
2014-10-08 00:03:38 +02:00

130 lines
4.7 KiB
EmacsLisp

;;; company-cmake.el --- company-mode completion back-end for CMake
;; Copyright (C) 2013 Free Software Foundation, Inc.
;; Author: Chen Bin <chenbin DOT sh AT gmail>
;; Version: 0.1
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; company-cmake offers completions for module names, variable names and
;; commands used by CMake. And their descriptions.
;;; Code:
(require 'company)
(require 'cl-lib)
(defgroup company-cmake nil
"Completion back-end for CMake."
:group 'company)
(defcustom company-cmake-executable
(executable-find "cmake")
"Location of cmake executable."
:type 'file)
(defvar company-cmake-executable-arguments
'("--help-command-list"
"--help-module-list"
"--help-variable-list")
"The arguments we pass to cmake, separately.
They affect which types of symbols we get completion candidates for.")
(defvar company-cmake--completion-pattern
"^\\(%s[a-zA-Z0-9_]%s\\)$"
"Regexp to match the candidates.")
(defvar company-cmake-modes '(cmake-mode)
"Major modes in which cmake may complete.")
(defvar company-cmake--meta-command-cache nil
"Cache for command arguments to retrieve descriptions for the candidates.")
(defun company-cmake--parse-output (prefix cmd)
"Analyze the temp buffer and collect lines."
(goto-char (point-min))
(let ((pattern (format company-cmake--completion-pattern
(regexp-quote prefix)
(if (zerop (length prefix)) "+" "*")))
(case-fold-search nil)
lines match)
(while (re-search-forward pattern nil t)
(setq match (match-string-no-properties 1))
(puthash match cmd company-cmake--meta-command-cache)
(push match lines))
lines))
(defun company-cmake--candidates (prefix)
(let ((res 0)
results
cmd)
(setq company-cmake--meta-command-cache (make-hash-table :test 'equal))
(dolist (arg company-cmake-executable-arguments)
(with-temp-buffer
(setq res (call-process company-cmake-executable nil t nil arg))
(unless (eq 0 res)
(message "cmake executable exited with error=%d" res))
(setq cmd (replace-regexp-in-string "-list$" "" arg) )
(setq results (nconc results (company-cmake--parse-output prefix cmd)))))
results))
(defun company-cmake--meta (prefix)
(let ((cmd-opts (gethash prefix company-cmake--meta-command-cache))
result)
(with-temp-buffer
(call-process company-cmake-executable nil t nil cmd-opts prefix)
;; Go to the third line, trim it and return the result.
;; Tested with cmake 2.8.9.
(goto-char (point-min))
(forward-line 2)
(setq result (buffer-substring-no-properties (line-beginning-position)
(line-end-position)))
(setq result (replace-regexp-in-string "^[ \t\n\r]+" "" result))
result)))
(defun company-cmake--doc-buffer (prefix)
(let ((cmd-opts (gethash prefix company-cmake--meta-command-cache)))
(with-temp-buffer
(call-process company-cmake-executable nil t nil cmd-opts prefix)
;; Go to the third line, trim it and return the doc buffer.
;; Tested with cmake 2.8.9.
(goto-char (point-min))
(forward-line 2)
(company-doc-buffer
(buffer-substring-no-properties (line-beginning-position)
(point-max))))))
(defun company-cmake (command &optional arg &rest ignored)
"`company-mode' completion back-end for CMake.
CMake is a cross-platform, open-source make system."
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'company-cmake))
(init (when (memq major-mode company-cmake-modes)
(unless company-cmake-executable
(error "Company found no cmake executable"))))
(prefix (and (memq major-mode company-cmake-modes)
(not (company-in-string-or-comment))
(company-grab-symbol)))
(candidates (company-cmake--candidates arg))
(meta (company-cmake--meta arg))
(doc-buffer (company-cmake--doc-buffer arg))
))
(provide 'company-cmake)
;;; company-cmake.el ends here