From 3d262f89e04a76a78667a4fc692ae71e540b7566 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 10 Jun 2020 00:05:16 +0200
Subject: Enable inline LaTeX previews in Orgmode

---
 gui/conf/init.el | 11 +++++++++++
 gui/emacs.nix    | 23 +++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/gui/conf/init.el b/gui/conf/init.el
index dfc886d..a88f253 100644
--- a/gui/conf/init.el
+++ b/gui/conf/init.el
@@ -36,6 +36,7 @@
 (set-face-attribute 'fixed-pitch    nil :family "Iosevka")
 (set-face-attribute 'variable-pitch nil :family "Source Sans Pro" :height 1.1)
 
+(load-library "custom-runtime-env")
 (load-library "akr-theme")
 
 (use-package doom-modeline
@@ -93,6 +94,15 @@
 
 (add-hook 'org-mode-hook 'visual-line-mode)
 
+(setq org-format-latex-options (plist-put org-format-latex-options :scale 1.5))
+(evil-leader/set-key
+  "p" 'org-latex-preview)
+
+(use-package org-fragtog
+  :ensure t
+  :config
+  (add-hook 'org-mode-hook 'org-fragtog-mode))
+
 (custom-theme-set-faces
    'user
    '(org-level-1 ((t (:family "Source Serif Pro" :weight regular :height 1.4 ))))
@@ -172,6 +182,7 @@
  'org-babel-load-languages
  '((python  . t)
    (shell   . t)
+   (latex   . t)
    (C       . t)))
 
 (setq org-confirm-babel-evaluate nil)
diff --git a/gui/emacs.nix b/gui/emacs.nix
index 57fac2a..008f6a7 100644
--- a/gui/emacs.nix
+++ b/gui/emacs.nix
@@ -14,6 +14,28 @@
         mv akr-theme.el $out/share/emacs/site-lisp/
       '';
     };
+
+    custom-runtime-env-el = let
+      tex = pkgs.texlive.combine {
+        inherit (pkgs.texlive) scheme-small dvipng;
+      };
+    in pkgs.writeTextFile {
+      name = "custom-runtime-env.el";
+      text = ''
+        (setenv "PATH" (concat (getenv "PATH") ":${tex}/bin"))
+        (add-to-list 'exec-path "${tex}/bin")
+      '';
+    };
+
+    custom-runtime-env = pkgs.stdenv.mkDerivation {
+      name = "emacs-custom-runtime-env";
+      phases = [ "installPhase" ];
+
+      installPhase = ''
+        mkdir -p $out/share/emacs/site-lisp
+        cp ${custom-runtime-env-el} $out/share/emacs/site-lisp/custom-runtime-env.el
+      '';
+    };
   in {
     enable = true;
 
@@ -21,6 +43,7 @@
       pdf-tools
     ] ++ [
       akr-color-theme
+      custom-runtime-env
     ];
   };
 
-- 
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