130 lines
4.7 KiB
EmacsLisp
130 lines
4.7 KiB
EmacsLisp
;;; company-cmake.el --- company-mode completion back-end for CMake
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;; Copyright (C) 2013 Free Software Foundation, Inc.
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;; Author: Chen Bin <chenbin DOT sh AT gmail>
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;; Version: 0.1
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; company-cmake offers completions for module names, variable names and
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;; commands used by CMake. And their descriptions.
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;;; Code:
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(require 'company)
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(require 'cl-lib)
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(defgroup company-cmake nil
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"Completion back-end for CMake."
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:group 'company)
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(defcustom company-cmake-executable
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(executable-find "cmake")
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"Location of cmake executable."
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:type 'file)
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(defvar company-cmake-executable-arguments
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'("--help-command-list"
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"--help-module-list"
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"--help-variable-list")
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"The arguments we pass to cmake, separately.
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They affect which types of symbols we get completion candidates for.")
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(defvar company-cmake--completion-pattern
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"^\\(%s[a-zA-Z0-9_]%s\\)$"
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"Regexp to match the candidates.")
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(defvar company-cmake-modes '(cmake-mode)
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"Major modes in which cmake may complete.")
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(defvar company-cmake--meta-command-cache nil
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"Cache for command arguments to retrieve descriptions for the candidates.")
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(defun company-cmake--parse-output (prefix cmd)
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"Analyze the temp buffer and collect lines."
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(goto-char (point-min))
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(let ((pattern (format company-cmake--completion-pattern
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(regexp-quote prefix)
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(if (zerop (length prefix)) "+" "*")))
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(case-fold-search nil)
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lines match)
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(while (re-search-forward pattern nil t)
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(setq match (match-string-no-properties 1))
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(puthash match cmd company-cmake--meta-command-cache)
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(push match lines))
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lines))
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(defun company-cmake--candidates (prefix)
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(let ((res 0)
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results
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cmd)
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(setq company-cmake--meta-command-cache (make-hash-table :test 'equal))
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(dolist (arg company-cmake-executable-arguments)
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(with-temp-buffer
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(setq res (call-process company-cmake-executable nil t nil arg))
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(unless (eq 0 res)
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(message "cmake executable exited with error=%d" res))
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(setq cmd (replace-regexp-in-string "-list$" "" arg) )
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(setq results (nconc results (company-cmake--parse-output prefix cmd)))))
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results))
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(defun company-cmake--meta (prefix)
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(let ((cmd-opts (gethash prefix company-cmake--meta-command-cache))
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result)
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(with-temp-buffer
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(call-process company-cmake-executable nil t nil cmd-opts prefix)
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;; Go to the third line, trim it and return the result.
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;; Tested with cmake 2.8.9.
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(goto-char (point-min))
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(forward-line 2)
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(setq result (buffer-substring-no-properties (line-beginning-position)
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(line-end-position)))
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(setq result (replace-regexp-in-string "^[ \t\n\r]+" "" result))
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result)))
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(defun company-cmake--doc-buffer (prefix)
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(let ((cmd-opts (gethash prefix company-cmake--meta-command-cache)))
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(with-temp-buffer
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(call-process company-cmake-executable nil t nil cmd-opts prefix)
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;; Go to the third line, trim it and return the doc buffer.
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;; Tested with cmake 2.8.9.
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(goto-char (point-min))
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(forward-line 2)
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(company-doc-buffer
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(buffer-substring-no-properties (line-beginning-position)
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(point-max))))))
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(defun company-cmake (command &optional arg &rest ignored)
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"`company-mode' completion back-end for CMake.
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CMake is a cross-platform, open-source make system."
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(interactive (list 'interactive))
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(cl-case command
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(interactive (company-begin-backend 'company-cmake))
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(init (when (memq major-mode company-cmake-modes)
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(unless company-cmake-executable
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(error "Company found no cmake executable"))))
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(prefix (and (memq major-mode company-cmake-modes)
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(not (company-in-string-or-comment))
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(company-grab-symbol)))
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(candidates (company-cmake--candidates arg))
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(meta (company-cmake--meta arg))
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(doc-buffer (company-cmake--doc-buffer arg))
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))
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(provide 'company-cmake)
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;;; company-cmake.el ends here
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