From bc1e86d1c863a3846ec4fea02be213ddb3622b2f Mon Sep 17 00:00:00 2001
From: benj <benj@rse8.com>
Date: Sat, 22 Dec 2018 18:46:33 -0800
Subject: add util to read compile_commands for clang-be

---
 init.el                 |  4 ++++
 utils/fetch-includes.el | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 utils/fetch-includes.el

diff --git a/init.el b/init.el
index 27a7b7b..5e73a7d 100644
--- a/init.el
+++ b/init.el
@@ -69,6 +69,7 @@
      haskell-mode
      highlight-escape-sequences
      ido-vertical-mode
+     json
      magit
      markdown-mode
      modern-cpp-font-lock
@@ -141,6 +142,9 @@
 (require 'setup-yaml-mode)
 (require 'setup-yasnippet)
 
+;; utility globals
+(require 'fetch-includes)
+
 ;; full power
 (put 'downcase-region 'disabled nil)
 (put 'upcase-region 'disabled nil)
diff --git a/utils/fetch-includes.el b/utils/fetch-includes.el
new file mode 100644
index 0000000..ce386af
--- /dev/null
+++ b/utils/fetch-includes.el
@@ -0,0 +1,59 @@
+;;; fetch-includes.el --- add headers to clang checker  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018  Benj Bellon
+
+;; Author: Benj Bellon
+;; Keywords: lisp
+
+;; 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:
+
+;; Parses the compile_commands.json db and adds headers
+;; to company-mode's company-clang backend.
+
+;;; Code:
+
+(require 'json)
+(require 'dash)
+
+(defun get-commands (json-file)
+  "Retrieves list of command strings possibly including header paths.
+JSON-FILE is the path to the json-file to parse."
+  (let* ((json-object-type 'hash-table)
+         (json-array-type 'list)
+         (json-key-type 'string)
+         (json (json-read-file json-file)))
+    (mapcar
+     (function (lambda (el) (gethash "command" el)))
+     json)))
+
+(defun get-include-paths (commands-list)
+  "Retrieve the include paths from a list of string which may be include paths.
+COMMANDS-LIST a list of commands"
+  (remove nil
+          (mapcar
+           (function (lambda (cmd) (if (string-match "-I" cmd) cmd)))
+           (split-string commands-list))))
+
+(defun company-clang-header-paths (db-path)
+  "Provides list of include paths to add to company-clang backend.
+DB-PATH the path to compile_commands.json"
+  (-flatten (mapcar
+             (function (lambda(cmd-list)
+                         (get-include-paths cmd-list)))
+             (get-commands db-path))))
+
+(provide 'fetch-includes)
+;;; fetch-includes.el ends here
-- 
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