Add the graph cube for graphviz development

config/fg42.user.v3.el

@@ -41,6 +41,7 @@
 (require 'cubes/git)
 (require 'cubes/bookmark)
 (require 'cubes/terraform)
+(require 'cubes/graph)
 
 ;; ============== MY STUFF ==============================
 
@@ -177,7 +178,7 @@
 ;;(fg42/imenu-cube)
 (fg42/elisp-cube)
 (fg42/region-expansion-cube)
-
+(fg42/graphviz-cube)
 (fg42/company-cube)
 (fg42/lsp-cube)
 (fg42/c++-cube)

core/cubes/graph.el

@@ -0,0 +1,52 @@
+;;; GraphCube --- The Graph utility cubes for FG42 -*- lexical-binding: t; -*-
+;;
+;; Copyright (c) 2010-2021 Sameer Rahmani & Contributors
+;;
+;; Author: Sameer Rahmani <lxsameer@gnu.org>
+;; URL: https://gitlab.com/FG42/FG42
+;; Version: 3.0.0
+;;
+;; 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 <http://www.gnu.org/licenses/>.
+;;
+;;; Commentary:
+;; Cubes are the building blocks of any `FG42' editor.  Each `cube' is a
+;; unit which defines different abilities in a deterministic and idempotent
+;; way.  Cubes are composable and a composition of cubes creates an editor.
+;;
+;;; Code:
+(require 'fpkg)
+(require 'fg42/cube)
+
+
+(defcube fg42/graphviz-cube
+  "This cube enable =dot= file editing in *FG42*. Using this cube you should
+be able to edit =dot= files and use =C-c C-p= to see a preview of your =dot=
+file. Use =C-c C-c= to compile the =dot= file.
+
+If =company= flag is enabled then =dot= autocomplete will be enabled as well."
+  (:title "Graphviz Cube"
+         :flag graphviz
+         :flag-default t
+         :modes 'graphviz-dot-mode)
+
+  (let ((indent-size (or (plist-get fg42/graphviz-cube-params :indent-size) 4)))
+    (when-flag 'company
+      (fpkg/use company-graphviz-dot))
+
+    (fpkg/use graphviz-dot-mode
+      :config
+      (setq graphviz-dot-indent-width indent-size))))
+
+(provide 'cubes/graph)
+;;; graph.el ends here