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company-cmake.el
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company-cmake.el
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;;; company-cmake.el --- company-mode completion backend for CMake -*- lexical-binding: t -*-
;; Copyright (C) 2013-2015, 2017-2018, 2020, 2023 Free Software Foundation, Inc.
;; Author: Chen Bin <chenbin DOT sh AT gmail>
;; Version: 0.2
;; 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:
;;
;; 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 backend 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-property-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 cmake-ts-mode)
"Major modes in which cmake may complete.")
(defvar company-cmake--candidates-cache nil
"Cache for the raw candidates.")
(defvar company-cmake--meta-command-cache nil
"Cache for command arguments to retrieve descriptions for the candidates.")
(defun company-cmake--replace-tags (rlt)
(setq rlt (replace-regexp-in-string
"\\(.*?\\(IS_GNU\\)?\\)<LANG>\\(.*\\)"
(lambda (_match)
(mapconcat 'identity
(if (match-beginning 2)
'("\\1CXX\\3" "\\1C\\3" "\\1G77\\3")
'("\\1CXX\\3" "\\1C\\3" "\\1Fortran\\3"))
"\n"))
rlt t))
(setq rlt (replace-regexp-in-string
"\\(.*\\)<CONFIG>\\(.*\\)"
(mapconcat 'identity '("\\1DEBUG\\2" "\\1RELEASE\\2"
"\\1RELWITHDEBINFO\\2" "\\1MINSIZEREL\\2")
"\n")
rlt))
rlt)
(defun company-cmake--fill-candidates-cache (arg)
"Fill candidates cache if needed."
(let (rlt)
(unless company-cmake--candidates-cache
(setq company-cmake--candidates-cache (make-hash-table :test 'equal)))
;; If hash is empty, fill it.
(unless (gethash arg company-cmake--candidates-cache)
(with-temp-buffer
(let ((res (call-process company-cmake-executable nil t nil arg)))
(unless (zerop res)
(message "cmake executable exited with error=%d" res)))
(setq rlt (buffer-string)))
(setq rlt (company-cmake--replace-tags rlt))
(puthash arg rlt company-cmake--candidates-cache))
))
(defun company-cmake--parse (prefix content cmd)
(let ((pattern (format company-cmake--completion-pattern
(regexp-quote prefix)
(if (zerop (length prefix)) "+" "*")))
(lines (split-string content "\n"))
rlt)
(dolist (line lines)
(when (string-match pattern line)
(let ((match (match-string 1 line)))
(when match
(puthash match cmd company-cmake--meta-command-cache)
(push match rlt)))))
rlt))
(defun company-cmake--candidates (prefix)
(let (results
cmd-opts
str)
(unless company-cmake--meta-command-cache
(setq company-cmake--meta-command-cache (make-hash-table :test 'equal)))
(dolist (arg company-cmake-executable-arguments)
(company-cmake--fill-candidates-cache arg)
(setq cmd-opts (replace-regexp-in-string "-list$" "" arg) )
(setq str (gethash arg company-cmake--candidates-cache))
(when str
(setq results (nconc results
(company-cmake--parse prefix str cmd-opts)))))
results))
(defun company-cmake--unexpand-candidate (candidate)
(cond
((string-match "^CMAKE_\\(C\\|CXX\\|Fortran\\)\\(_.*\\)$" candidate)
(setq candidate (concat "CMAKE_<LANG>" (match-string 2 candidate))))
;; C flags
((string-match "^\\(.*_\\)IS_GNU\\(C\\|CXX\\|G77\\)$" candidate)
(setq candidate (concat (match-string 1 candidate) "IS_GNU<LANG>")))
;; C flags
((string-match "^\\(.*_\\)OVERRIDE_\\(C\\|CXX\\|Fortran\\)$" candidate)
(setq candidate (concat (match-string 1 candidate) "OVERRIDE_<LANG>")))
((string-match "^\\(.*\\)\\(_DEBUG\\|_RELEASE\\|_RELWITHDEBINFO\\|_MINSIZEREL\\)\\(.*\\)$" candidate)
(setq candidate (concat (match-string 1 candidate)
"_<CONFIG>"
(match-string 3 candidate)))))
candidate)
(defun company-cmake--meta (candidate)
(let ((cmd-opts (gethash candidate company-cmake--meta-command-cache))
result)
(setq candidate (company-cmake--unexpand-candidate candidate))
;; Don't cache the documentation of every candidate (command)
;; Cache in this case will cost too much memory.
(with-temp-buffer
(call-process company-cmake-executable nil t nil cmd-opts candidate)
;; 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 (candidate)
(let ((cmd-opts (gethash candidate company-cmake--meta-command-cache)))
(setq candidate (company-cmake--unexpand-candidate candidate))
(with-temp-buffer
(call-process company-cmake-executable nil t nil cmd-opts candidate)
;; 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-prefix-dollar-brace-p ()
"Test if the current symbol follows ${."
(save-excursion
(skip-syntax-backward "w_")
(and (eq (char-before (point)) ?\{)
(eq (char-before (1- (point))) ?$))))
(defun company-cmake (command &optional arg &rest _ignored)
"`company-mode' completion backend 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)
(or (not (company-in-string-or-comment))
(company-cmake-prefix-dollar-brace-p))
(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