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+;;; company-cmake.el --- company-mode completion backend for CMake
+
+;; Copyright (C) 2013-2015, 2017-2018, 2020  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)
+  "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 ((start 0)
+        (pattern (format company-cmake--completion-pattern
+                         (regexp-quote prefix)
+                         (if (zerop (length prefix)) "+" "*")))
+        (lines (split-string content "\n"))
+        match
+        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