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update tips for 'stuck' haskell repl #3325

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update tips for 'stuck' haskell repl #3325

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35 changes: 29 additions & 6 deletions layers/+lang/haskell/README.org
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,8 @@
- [[#cabal-files][Cabal files]]
- [[#faq][FAQ]]
- [[#repl-doesnt-work][REPL doesn't work]]
- [[#i-am-using-stack-and-ghc-mod-but-ghc-mod-doesnt-work][I am using =stack= and =ghc-mod=, but =ghc-mod= doesn't work]]
- [[#repl-is-stuck][REPL is stuck]]
- [[#i-am-using-stack-and-ghc-mod-but-ghc-mod-doesnt-work][I am using =stack= and =ghc-mod=, but =ghc-mod= doesn't work]]

* Description
This layer adds support for the [[https://www.haskell.org/][Haskell]] language.
Expand Down Expand Up @@ -308,11 +308,34 @@ Available options are:
- cabal-ghci
- stack-ghci

** REPL is stuck
Make sure that when you are typing anything in REPL there is a space between
what you type and =位>=. When there is no space - REPL will behave as it's stuck.
Usually, when you enter normal state, cursor is moved back, so there is no
required space when you switch to insert mode. There is possible workaround -
just add following snippet to your =dotspacemacs/user-config= function:

#+BEGIN_SRC emacs-lisp
(when (configuration-layer/layer-usedp 'haskell)
(add-hook 'haskell-interactive-mode-hook
(lambda ()
(setq-local evil-move-cursor-back nil))))
#+END_SRC

It will make cursor stay at the right place in the REPL buffer when you enter
normal state. Which in most cases helps you to avoid the problem with 'stuck'
REPL.

Also, some users might want to start REPL in insert mode. For this to happen you
could place following snippet in your =dotspacemacs/user-config= function:

#+BEGIN_SRC emacs-lisp
(when (configuration-layer/layer-usedp 'haskell)
(defadvice haskell-interactive-switch (after spacemacs/haskell-interactive-switch-advice activate)
(when (eq dotspacemacs-editing-style 'vim)
(call-interactively 'evil-insert))))
#+END_SRC

** I am using =stack= and =ghc-mod=, but =ghc-mod= doesn't work
Make sure that =dist= directory doesn't exist in your project root. So if it
exists, just remove it and try again.

** REPL is stuck
Make sure that when you are typing anything in REPL there is a space between
what you type and =位>=. This problem usually happens when you switch from normal
mode to insert mode.