From 750b74379dd86fd08d1ff4bff3753359c36ef374 Mon Sep 17 00:00:00 2001
From: Henrik Lissner <henrik@lissner.net>
Date: Tue, 26 Dec 2017 18:12:36 -0500
Subject: [PATCH] lang/cc: add rtags support #305

---
 modules/lang/cc/config.el   | 45 +++++++++++++++++++++++++++++++++++++
 modules/lang/cc/packages.el | 10 +++++----
 2 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/modules/lang/cc/config.el b/modules/lang/cc/config.el
index fb2e6ef71..0bb7b1a02 100644
--- a/modules/lang/cc/config.el
+++ b/modules/lang/cc/config.el
@@ -188,3 +188,48 @@ compilation database is present in the project.")
     (set! :company-backend 'glsl-mode '(company-glsl))))
 
 
+;;
+;; Rtags Support
+;;
+
+(def-package! rtags
+  :after cc-mode
+  :config
+  (if (not (executable-find "rdm"))
+      (warn "cc-mode: couldn't find rdm, disabling rtags support")
+    (add-hook! (c-mode c++-mode) #'rtags-start-process-unless-running)
+    (set! :jump '(c-mode c++-mode)
+      :definition #'rtags-find-symbol-at-point
+      :references #'rtags-find-references-at-point))
+
+  (setq rtags-autostart-diagnostics t
+        rtags-use-bookmarks nil
+        rtags-jump-to-first-match nil
+        rtags-results-buffer-other-window t)
+
+  (defun +cc|cleanup-rdm-maybe ()
+    "Shut down the rtags daemon, if it's running."
+    (when (and (processp rtags-rdm-process)
+               (not (memq (process-status rtags-rdm-process) '(exit signal)))
+               (not (doom-buffers-in-mode '(c-mode c++-mode))))
+      (rtags-cancel-process)))
+  (add-hook 'doom-cleanup-hook #'+cc|cleanup-rdm-maybe)
+  (add-hook 'rtags-jump-hook #'evil-set-jump)
+  (add-hook 'rtags-after-find-file-hook #'recenter))
+
+(def-package! ivy-rtags
+  :when (featurep! :completion ivy)
+  :after rtags
+  :init
+  ;; NOTE Ivy integration breaks when rtags is byte-compiled with Emacs 26 or
+  ;; later, so we un-byte-compile it before we load it.
+  (eval-when-compile
+    (when (>= emacs-major-version 26)
+      (when-let* ((elc-file (locate-library "rtags.elc" t doom--package-load-path)))
+        (delete-file elc-file))))
+  :config (setq rtags-display-result-backend 'ivy))
+
+(def-package! helm-rtags
+  :when (featurep! :completion helm)
+  :after rtags
+  :config (setq rtags-display-result-backend 'helm))
diff --git a/modules/lang/cc/packages.el b/modules/lang/cc/packages.el
index 8109c1886..24f69c2e6 100644
--- a/modules/lang/cc/packages.el
+++ b/modules/lang/cc/packages.el
@@ -8,14 +8,16 @@
 (package! glsl-mode)
 (package! irony)
 (package! irony-eldoc)
-(package! opencl-mode)
 (package! modern-cpp-font-lock)
-
-(when (featurep! :feature syntax-checker)
-  (package! flycheck-irony))
+(package! opencl-mode)
 
 (when (featurep! :completion company)
   (package! company-glsl :recipe (:fetcher github :repo "Kaali/company-glsl"))
   (package! company-irony)
   (package! company-irony-c-headers))
 
+(package! rtags)
+(when (featurep! :completion ivy)
+  (package! ivy-rtags))
+(when (featurep! :completion helm)
+  (package! helm-rtags))