Add solidity layer

CHANGELOG.develop

@@ -325,6 +325,7 @@ sane way, here is the complete list of changed key bindings
 - perl6 (thanks to Bahtiar Gadimov and yuhan0)
 - prolog (thanks to Newres Al Haider)
 - reasonml (thanks to fredyr and Dave Aitken)
+- solidity (thanks to Brooklyn Zelenka)
 - protobuf (thanks to Amol Mandhane)
 - restructuredtext (thanks to Wei-Wei Guo and Kalle Lindqvist)
 - semantic-web (thanks to Andreas Textor)
@@ -2722,6 +2723,9 @@ Other:
 - Fixed =helm= menu display (thanks to Leslie Shawn Russell)
 **** Smex
 - Fixed ~SPC m :~ for current major mode commands (thanks to tinysong)
+**** Solidity
+- Key bindings:
+  - Added ~SPC m g~ Estimate gas at point (thanks to Brooklyn Zelenka)
 **** Source control
 - Install orgit only when org package is used (thanks to Boris Buliga)
 - Defer git-gutter loading (thanks to Aaron Jensen)

layers/+lang/solidity/README.org

@@ -0,0 +1,73 @@
+#+TITLE: Solidity Layer
+
+[[file:img/solidity.png]]
+
+* Table of Contents                                       :TOC_4_gh:noexport:
+- [[#description][Description]]
+  - [[#features][Features:]]
+- [[#install][Install]]
+  - [[#layer][Layer]]
+  - [[#linter][Linter]]
+    - [[#solc][solc]]
+    - [[#ethlint][Ethlint]]
+- [[#options][Options]]
+- [[#key-bindings][Key bindings]]
+
+* Description
+
+A layer to support Solidity development in Spacemacs.
+
+** Features:
+- Syntax highlighting
+- Syntax checking
+- Gas estimation
+
+* Install
+** Layer
+To use this configuration layer, add it to your =~/.spacemacs=. You will need to
+add =solidity= to the existing =dotspacemacs-configuration-layers= list in this
+file.
+
+** Linter
+*** solc
+To use the solc flycheck checker, install [[https://solidity.readthedocs.io][solc]], and enable it in your =~/.spacemacs=.
+
+#+BEGIN_SRC emacs-lisp
+  (solidity :variables
+            solidity-flycheck-solc-checker-active t)
+#+END_SRC
+
+Please note that you can't use [[https://github.com/ethereum/solc-js][solc-js]] for the solc flycheck checker.
+
+*** Ethlint
+To use solium flycheck checker, install [[https://github.com/duaraghav8/Ethlint][Ethlint]].
+
+#+BEGIN_SRC sh
+  npm i -g ethlint
+#+END_SRC
+
+Then enable it in your =~/.spacemacs=:
+
+#+BEGIN_SRC emacs-lisp
+  (solidity :variables
+            solidity-flycheck-solium-checker-active t)
+#+END_SRC
+
+And make sure that =.soliumrc.json= exists in the root directory of your DApp:
+
+#+BEGIN_SRC sh
+  solium --init
+#+END_SRC
+
+* Options
+
+| Variable                                  | Default value | Description                                                |
+|-------------------------------------------+---------------+------------------------------------------------------------|
+| =solidity-flycheck-solc-checker-active=   | =nil=         | If non-nil, use solc flycheck checker for Solidity Mode.   |
+| =solidity-flycheck-solium-checker-active= | =nil=         | If non-nil, use solium flycheck checker for Solidity Mode. |
+
+* Key bindings
+
+| Key Binding | Description           |
+|-------------+-----------------------|
+| ~SPC m g~   | Estimate gas at point |

layers/+lang/solidity/layers.el

@@ -0,0 +1,12 @@
+;;; layers.el --- Solidity Layer Configuration File for Spacemacs
+;;
+;; Copyright (c) 2012-2019 Sylvain Benner & Contributors
+;;
+;; Author: Seong Yong-ju <sei40kr@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(configuration-layer/declare-layer-dependencies '(node))

layers/+lang/solidity/packages.el

@@ -0,0 +1,38 @@
+;;; packages.el --- solidity layer packages file for Spacemacs.
+;;
+;; Copyright (c) 2012-2017 Sylvain Benner & Contributors
+;;
+;; Author: Brooklyn Zelenka <be.zelenka@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;;; Code:
+
+(defconst solidity-packages
+  '(
+    add-node-modules-path
+    flycheck
+    solidity-mode
+    solidity-flycheck))
+
+(defun solidity/post-init-add-node-modules-path ()
+  (add-hook 'solidity-mode-hook #'add-node-modules-path))
+
+(defun solidity/init-solidity-mode ()
+  (use-package solidity-mode
+    :defer t
+    :config
+    (spacemacs/set-leader-keys-for-major-mode 'solidity-mode
+      "g" #'solidity-estimate-gas-at-point)))
+
+(defun solidity/post-init-flycheck ()
+  (spacemacs/enable-flycheck 'solidity-mode))
+
+(defun solidity/init-solidity-flycheck ()
+  (use-package solidity-flycheck
+    :defer t
+    :init
+    (add-hook 'solidity-mode-hook #'(lambda () (require 'solidity-flycheck)))))