Added initial support for structured-haskell-mode

contrib/lang/haskell/README.md

@@ -11,7 +11,9 @@
         - [Layer](#layer)
         - [Cabal packages](#cabal-packages)
         - [OS X](#os-x)
-        - [Enabling GHCi-ng support](#enabling-ghci-ng-support)
+        - [Optional extras](#optional-extras)
+            - [GHCi-ng support](#ghci-ng-support)
+            - [structured-haskell-mode](#structured-haskell-mode)
     - [Key bindings](#key-bindings)
         - [Haskell source code:](#haskell-source-code)
             - [Haskell commands:](#haskell-commands)
@@ -23,6 +25,7 @@
 
 <!-- markdown-toc end -->
 
+
 ## Description
 
 This layer adds support for the [Haskell][] language.
@@ -84,7 +87,10 @@ so that the path is added before any layers is loaded.
 Note that `emacs.app` for OS X does not pick up `$PATH` from `~/.bashrc` or
 `~/.zshrc` when launched from outside a terminal.
 
-### Enabling GHCi-ng support
+### Optional extras
+The Haskell layer supports some extra features that can be enabled through layer variables.
+
+#### GHCi-ng support
 [ghci-ng][] adds some nice features to `haskell-mode`, and is supported in Spacemacs by a layer variable:
 
 Follow the instructions to install [ghci-ng][] (remember to add `:set +c` in `~/.ghci`,
@@ -102,6 +108,14 @@ Once ghci-ng is enabled, two of the old keybindings are overriden with improved
 <kbd>SPC m g g</kbd>  | go to definition
 <kbd>SPC m u</kbd>    | finds uses of identifier
 
+#### structured-haskell-mode
+[structured-haskell-mode][], or shm, replaces hi2 and adds some nice functionality.
+To enable shm, run `cabal install structured-haskell-mode` and set the layer variable:
+```elisp
+;; List of configuration layers to load.
+dotspacemacs-configuration-layers '(company-mode (haskell :variables haskell-shm-support t) git)
+```
+
 ## Key bindings
 
 All Haskell specific bindings are prefixed with <kbd>SPC m</kbd>
@@ -183,3 +197,4 @@ REPL commands are prefixed by <kbd>SPC m s</kbd>:
 [company-ghc]: https://github.com/iquiw/company-ghc
 [hi2]: https://github.com/nilcons/hi2
 [ghci-ng]: https://github.com/chrisdone/ghci-ng
+[structured-haskell-mode]: https://github.com/chrisdone/structured-haskell-mode

contrib/lang/haskell/config.el

@@ -11,4 +11,7 @@
 
 ;; Variables
 (defvar haskell-ghci-ng-support nil
-  "If non nil ghci-ng support is enabled")
+  "If non-nil ghci-ng support is enabled")
+
+(defvar haskell-shm-support nil
+  "If non-nil structured-haskell-mode support is enabled")

contrib/lang/haskell/packages.el

@@ -18,12 +18,25 @@
     ghc
     haskell-mode
     hi2
+    shm
     ))
 
 (defun haskell/init-flycheck ()
   ;;(add-hook 'haskell-mode-hook 'flycheck-mode))
   (add-hook 'flycheck-mode-hook 'flycheck-haskell-setup))
 
+(defun haskell/init-shm ()
+  (use-package shm
+    :defer t
+    :if haskell-shm-support
+    :init
+    (add-hook 'haskell-mode-hook 'structured-haskell-mode)
+    :config
+    (progn
+
+      )))
+
+
 (defun haskell/init-haskell-mode ()
   (require 'haskell-yas)
   (use-package haskell-mode
@@ -139,7 +152,9 @@
       (defun haskell-hook ()
         (ghc-init)
         ;; Use advanced indention
-        (turn-on-haskell-indentation)
+        (if (not haskell-shm-support)
+            (turn-on-haskell-indentation)
+          )
 
         ;; Indent the below lines on columns after the current column.
         ;; Might need better bindings for spacemacs and OS X
@@ -188,6 +203,7 @@
   (use-package hi2
     :diminish hi2-mode
     :commands turn-on-hi2
+    :if (not haskell-shm-support)
     :init
     (add-hook 'haskell-mode-hook 'turn-on-hi2)
     :config