;;; packages.el --- Haskell Layer packages File for Spacemacs
;;
;; Copyright (c) 2012-2014 Sylvain Benner
;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
;;
;; Author: Sylvain Benner <sylvain.benner@gmail.com>
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3

(setq haskell-packages
  '(
    cmm-mode
    company
    company-ghc
    company-cabal
    flycheck
    flycheck-haskell
    ghc
    haskell-mode
    haskell-snippets
    hindent
    shm
    ))

(defun haskell/init-cmm-mode ()
  (use-package cmm-mode
    :defer t))

(defun haskell/post-init-flycheck ()
  (spacemacs/add-flycheck-hook 'haskell-mode))

(when (configuration-layer/layer-usedp 'syntax-checking)
  (defun haskell/init-flycheck-haskell ()
    (use-package flycheck-haskell
      :if (configuration-layer/package-usedp 'flycheck)
      :commands flycheck-haskell-configure
      :init (add-hook 'flycheck-mode-hook 'flycheck-haskell-configure))))

(defun haskell/init-ghc ()
  (use-package ghc
    :defer t
    :if haskell-enable-ghc-mod-support
    :init (add-hook 'haskell-mode-hook 'ghc-init)
    :config
    (when (configuration-layer/package-usedp 'flycheck)
      ;; remove overlays from ghc-check.el if flycheck is enabled
      (set-face-attribute 'ghc-face-error nil :underline nil)
      (set-face-attribute 'ghc-face-warn nil :underline nil))))

(defun haskell/init-haskell-mode ()
  (use-package haskell-mode
    :defer t
    :config
    (progn
      ;; Haskell main editing mode key bindings.
      (defun spacemacs/init-haskell-mode ()
        ;; use only internal indentation system from haskell
        (if (fboundp 'electric-indent-local-mode)
            (electric-indent-local-mode -1))
        (when haskell-enable-shm-support
          ;; in structured-haskell-mode line highlighting creates noise
          (setq-local global-hl-line-mode nil)))

      ;; hooks
      (add-hook 'haskell-mode-hook 'spacemacs/init-haskell-mode)
      (add-hook 'haskell-cabal-mode-hook 'haskell-cabal-hook)
      (unless haskell-enable-shm-support
        (add-hook 'haskell-mode-hook 'haskell-indentation-mode))

      ;; settings
      (setq
       ;; Use notify.el (if you have it installed) at the end of running
       ;; Cabal commands or generally things worth notifying.
       haskell-notify-p t
       ;; To enable tags generation on save.
       haskell-tags-on-save t
       ;; Remove annoying error popups
       haskell-interactive-popup-errors nil
       ;; Better import handling
       haskell-process-suggest-remove-import-lines t
       haskell-process-auto-import-loaded-modules t
       ;; Disable haskell-stylish on save, it breaks flycheck highlighting
       haskell-stylish-on-save nil)

      ;; key bindings
      (defun spacemacs/haskell-process-do-type-on-prev-line ()
        (interactive)
        (if haskell-enable-ghci-ng-support
            (haskell-mode-show-type-at 1)
          (haskell-process-do-type 1)))

      (evil-leader/set-key-for-mode 'haskell-mode
        "mgg"  'haskell-mode-jump-to-def-or-tag
        "mgi"  'haskell-navigate-imports
        "mf"   'haskell-mode-stylish-buffer

        "msb"  'haskell-process-load-or-reload
        "msc"  'haskell-interactive-mode-clear
        "mss"  'haskell-interactive-bring
        "msS"  'haskell-interactive-switch

        "mca"  'haskell-process-cabal
        "mcb"  'haskell-process-cabal-build
        "mcc"  'haskell-compile
        "mcv"  'haskell-cabal-visit-file

        "mhd"  'inferior-haskell-find-haddock
        "mhh"  'hoogle
        "mhH"  'hoogle-lookup-from-local
        "mhi"  'haskell-process-do-info
        "mht"  'haskell-process-do-type
        "mhT"  'spacemacs/haskell-process-do-type-on-prev-line
        "mhy"  'hayoo

        "mdd"  'haskell-debug
        "mdb"  'haskell-debug/break-on-function
        "mdn"  'haskell-debug/next
        "mdN"  'haskell-debug/previous
        "mdB"  'haskell-debug/delete
        "mdc"  'haskell-debug/continue
        "mda"  'haskell-debug/abandon
        "mdr"  'haskell-debug/refresh)

      ;; Switch back to editor from REPL
      (evil-leader/set-key-for-mode 'haskell-interactive-mode
        "msS"  'haskell-interactive-switch-back)

      ;; Compile
      (evil-leader/set-key-for-mode 'haskell-cabal
        "mC"  'haskell-compile)

      ;; Cabal-file bindings
      (evil-leader/set-key-for-mode 'haskell-cabal-mode
        ;; "m="  'haskell-cabal-subsection-arrange-lines ;; Does a bad job, 'gg=G' works better
        "md" 'haskell-cabal-add-dependency
        "mb" 'haskell-cabal-goto-benchmark-section
        "me" 'haskell-cabal-goto-executable-section
        "mt" 'haskell-cabal-goto-test-suite-section
        "mm" 'haskell-cabal-goto-exposed-modules
        "ml" 'haskell-cabal-goto-library-section
        "mn" 'haskell-cabal-next-subsection
        "mp" 'haskell-cabal-previous-subsection
        "mN" 'haskell-cabal-next-section
        "mP" 'haskell-cabal-previous-section
        "mf" 'haskell-cabal-find-or-create-source-file)

      ;; Make "RET" behaviour in REPL saner
      (evil-define-key 'insert haskell-interactive-mode-map
        (kbd "RET") 'haskell-interactive-mode-return)
      (evil-define-key 'normal haskell-interactive-mode-map
        (kbd "RET") 'haskell-interactive-mode-return)

      ;;GHCi-ng
      (when haskell-enable-ghci-ng-support
        ;; haskell-process-type is set to auto, so setup ghci-ng for either case
        ;; if haskell-process-type == cabal-repl
        (setq haskell-process-args-cabal-repl '("--ghc-option=-ferror-spans" "--with-ghc=ghci-ng"))
        ;; if haskell-process-type == GHCi
        (setq haskell-process-path-ghci "ghci-ng")

        (evil-leader/set-key-for-mode 'haskell-mode
          "mu"   'haskell-mode-find-uses
          "mht"  'haskell-mode-show-type-at
          "mgg"  'haskell-mode-goto-loc))

      ;; Useful to have these keybindings for .cabal files, too.
      (with-eval-after-load 'haskell-cabal-mode-map
        (define-key haskell-cabal-mode-map
          [?\C-c ?\C-z] 'haskell-interactive-switch))))


  (with-eval-after-load 'haskell-indentation
    ;; Show indentation guides in insert or emacs state only.
    (defun spacemacs//haskell-indentation-show-guides ()
      "Show visual indentation guides."
      (when (and (boundp 'haskell-indentation-mode) haskell-indentation-mode)
        (haskell-indentation-enable-show-indentations)))

    (defun spacemacs//haskell-indentation-hide-guides ()
      "Hide visual indentation guides."
      (when (and (boundp 'haskell-indentation-mode) haskell-indentation-mode)
        (haskell-indentation-disable-show-indentations)))

    ;; first entry in normal state
    (add-hook 'evil-normal-state-entry-hook 'spacemacs//haskell-indentation-hide-guides)

    (add-hook 'evil-insert-state-entry-hook 'spacemacs//haskell-indentation-show-guides)
    (add-hook 'evil-emacs-state-entry-hook 'spacemacs//haskell-indentation-show-guides)
    (add-hook 'evil-insert-state-exit-hook 'spacemacs//haskell-indentation-hide-guides)
    (add-hook 'evil-emacs-state-exit-hook 'spacemacs//haskell-indentation-hide-guides)))

(defun haskell/init-haskell-snippets ()
  ;; manually load the package since the current implementation is not lazy
  ;; loading friendly (funny coming from the haskell mode :-))
  (setq haskell-snippets-dir (spacemacs//get-package-directory
                              'haskell-snippets))

  (defun haskell-snippets-initialize ()
    (let ((snip-dir (expand-file-name "snippets" haskell-snippets-dir)))
      (add-to-list 'yas-snippet-dirs snip-dir t)
      (yas-load-directory snip-dir)))

  (with-eval-after-load 'yasnippet (haskell-snippets-initialize)))

(defun haskell/init-hindent ()
  (use-package hindent
    :defer t
    :if (stringp haskell-enable-hindent-style)
    :init
    (add-hook 'haskell-mode-hook #'hindent-mode)
    :config
    (progn
      (setq hindent-style haskell-enable-hindent-style)
      (evil-leader/set-key-for-mode 'haskell-mode
        "mF" 'hindent/reformat-decl))))

(defun haskell/init-shm ()
  (use-package shm
    :defer t
    :if haskell-enable-shm-support
    :init
    (add-hook 'haskell-mode-hook 'structured-haskell-mode)
    :config
    (progn
      (when (require 'shm-case-split nil 'noerror)
        ;;TODO: Find some better bindings for case-splits
        (define-key shm-map (kbd "C-c S") 'shm/case-split)
        (define-key shm-map (kbd "C-c C-s") 'shm/do-case-split))

      (evil-define-key 'normal shm-map
        (kbd "RET") nil
        (kbd "C-k") nil
        (kbd "C-j") nil
        (kbd "D") 'shm/kill-line
        (kbd "R") 'shm/raise
        (kbd "P") 'shm/yank
        (kbd "RET") 'shm/newline-indent
        (kbd "RET") 'shm/newline-indent
        (kbd "M-RET") 'evil-ret
        )

      (evil-define-key 'operator shm-map
        (kbd ")") 'shm/forward-node
        (kbd "(") 'shm/backward-node)

      (evil-define-key 'motion shm-map
        (kbd ")") 'shm/forward-node
        (kbd "(") 'shm/backward-node)

      (define-key shm-map (kbd "C-j") nil)
      (define-key shm-map (kbd "C-k") nil))))

(when (configuration-layer/layer-usedp 'auto-completion)
  (defun haskell/post-init-company ()
    (spacemacs|add-company-hook haskell-mode)
    (spacemacs|add-company-hook haskell-cabal-mode))

  (defun haskell/init-company-ghc ()
    (use-package company-ghc
      :if (configuration-layer/package-usedp 'company)
      :defer t
      :init
      (push '(company-ghc company-dabbrev-code company-yasnippet)
            company-backends-haskell-mode)))

  (defun haskell/init-company-cabal ()
    (use-package company-cabal
      :if (configuration-layer/package-usedp 'company)
      :defer t
      :init
      (push '(company-cabal)
            company-backends-haskell-cabal-mode))))