From 109495e3ab2adb474cb0b6538ec318034b39f02c Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Thu, 11 Jun 2020 14:56:14 +0200
Subject: Setup automatic tag updating in Emacs

Sadly counsel-etags did not find universal-ctags in my PATH so some
custom setup in Nix home-manager was required.
---
 gui/conf/init.el | 6 ++++++
 gui/emacs.nix    | 5 ++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gui/conf/init.el b/gui/conf/init.el
index 4dbaba5..f7f7916 100644
--- a/gui/conf/init.el
+++ b/gui/conf/init.el
@@ -236,6 +236,12 @@
 (use-package counsel-etags
   :ensure t
   :config
+  (setq tags-revert-without-query t)
+  (setq large-file-warning-threshold nil)
+  (add-hook 'prog-mode-hook
+    (lambda ()
+      (add-hook 'after-save-hook
+                'counsel-etags-virtual-update-tags 'append 'local)))
   (evil-leader/set-key
     "d" 'counsel-etags-find-tag-at-point))
 
diff --git a/gui/emacs.nix b/gui/emacs.nix
index 008f6a7..8b9749f 100644
--- a/gui/emacs.nix
+++ b/gui/emacs.nix
@@ -22,8 +22,11 @@
     in pkgs.writeTextFile {
       name = "custom-runtime-env.el";
       text = ''
-        (setenv "PATH" (concat (getenv "PATH") ":${tex}/bin"))
+        (setenv "PATH" (concat (getenv "PATH")
+	                             ":${tex}/bin"))
         (add-to-list 'exec-path "${tex}/bin")
+
+        (setq counsel-etags-update-tags-backend (lambda (src-dir) (shell-command "${pkgs.universal-ctags}/bin/ctags -e -R")))
       '';
     };
 
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