haskell在emacs中复制 [英] haskell repl in emacs

问题描述

我有 haskell-mod 和 ghc-mod 最新的 emacs 24.3.1 。 GHC是 7.6.3

我已经创建了一个haskell文件first.hs，当我做 Cc Cl
它询问：

 启动一个名为haskell的新项目？ y或n 
  

我的目录名是haskell。我按y

 设置cabal目录
  

我已尝试使用〜/ .cabal和我当前的目录名为 haskell

 设置当前目录
  

只需按下Enter即可有haskell目录

它显示错误消息：

  haskell过程-start：cl-ecase failed：cabal-rep，（ghci quote cabal-repl quote cabal-ghci quote cabal-dev quote）
  

我如何获得副本？

我看到我可能需要降级ghc版本才能使其工作。
这是一个很好的解决方案吗？

解决方案：

init.el中的多个 custom-set-variables ，导致问题。

解决方案

更新2017

现在我们有 Intero 我建议您尝试Intero / Stack - 它的效果非常好。

随着它的配置更加细微：

  ;; -------------------------------------------------- -------------------- 
 ;; HASKELL 
（require'haskell-mode）
（require'intero）
（add-hook'haskell-mode-hook'intero-mode）
（require'flycheck）
（setq flycheck-check-syntax-automatically'（保存新行））
（flycheck-add-next-checker'intero'（warning。haskell-hlint））
  

关于 REPL ，您基本上只是加载文件，然后加载 Cc Cl 到repl（你可以随时在 Cc Cz 之间切换两个窗口，您可以使用 Cc清除repl-buffer Ck （内部时）。

唯一的缺点是Intero通常安装在您的项目本地，所以首次启动进入新项目将需要一段时间才能下载/编译/启动 - 但这并不重要，您会获得很多收益。

---

更新

现在， stack 出来并运行得很好，我建议设置 haskell -process-type to auto ，也许安装 ghc-mod 使用堆栈。

这里是我使用的当前设置：

 （require'haskell-mode）
（add-hook' haskell-mode-hook'on-haskell-doc-mode）
（add-hook'haskell-mode-hook'turn-on-haskell-indentation）
（add-hook'haskell-模式钩子'linum模式）
（add-to-list'exec-path〜/ .local / bin）
（eval-after-load'haskell-mode'（progn 
（define-key haskell-mode-map（kbdCc Cl）'haskell-process-load-file）
（define-key haskell-mode-map（kbdCc Cn Ct）'haskell -process-do-type）
（define-key haskell-mode-map（kbdCc Cn Ci）'haskell-process-do-info）
（define-key haskell-mode-map \C-ch'haskell-hoogle）））
（eval-after-load'haskell-cabal'（progn 
（define-key haskell-cabal-mode-map（kbdCc Ck）'haskell-interactive-ode-clear）
（define-key haskell-cabal-mode-map（kbdCc Cc）'haskell-process- cabal-build）
（define-key haskell-cabal-mode-map（kbdCc c）'haskell-process-cabal））
 
（require'company-ghci） 
（push'company-ghci company-backends）
（add-hook'haskell-mode-hook'company-mode）
（add-hook'haskell-interactive-mode-hook'公司模式）
  

正如你所看到的，我基本上摆脱了所有的 ghc -mod 相关的东西（ stack 的工作原理与当前 haskell-mode ）并替换为公司后端（虽然这一个很慢，我希望找到更好的东西）

变量

您通常在Emacs / Haskell模式配置中设置的论文

 （custom-set-variables 
 ;;这里有更多的这些 - 这些是Haskell相关的：
'（haskell-font-lock-symbols（quote unicode））
'（haskell-hoogle-command nil）
' （haskell-mode-hook 
（quote 
（linum-mode turn-on-haskell-indentation turn-on-haskell-doc-mode））t）
'（haskell-process- auto-import-loaded-modules t）
'（haskell-process-load-or-reload-prompt t）
'（haskell-process-log t）
'（haskell-process -suggest-language-pragmas nil）
'（haskell-process-suggest-no-warn-orphans t）
'（haskell-process-type（quote auto））
'（haskell -process-use-presentation-mode t）
'（haskell-tags-on-save t）
'（lower-haskell-wait-and-jump t）
'（safe-局部变量值
（报价
（（haskell-process-use-ghci。t）
（haskell-indent-spaces。4））））
（uniquify） ））
  

这些是我添加的包：

• haskell-mode


• 公司（不是Haskell-rel


• 公司名称


• company-ghci


• ghci-completion


• 莎士比亚模式（对于Yesod）


• company-quickhelp（为了很好的显示：i ）

---

首先

如果它要求您的 cabal目录 - 它想知道你的 myProject.cabal 文件的位置 - 如果你没有一个只是拿起文件夹的文件夹（默认 - 我认为默认/找到从来没有让我失望，直到现在）。

如果你需要一些sample-.emacs-setup

这里是我的 .emacs 文件中适用于我的部分：

 （autoload'ghc-initghcnil t）
（autoload'ghc-debugghcnil t）
（add- hook'haskell-mode-hook（lambda（）（ghc-init）））
（add-hook'haskell-mode-hook'turn-on-haskell-indentation）
 
 eval-after-load'haskell-mode'（progn 
（define-k haskell-mode-map（kbdCcCl）'haskell-process-load-or-reload）
（define-key haskell-mode-map（kbdC-`）'haskell-interactive-带来）
（define-key haskell-mode-map（kbdCc Cn Ct）'haskell-process-do-type）
（define-key haskell-mode-map（kbdCc Cn （kCc Cn Cc）'haskell-process-cabal-build'
（define-key hascell-process-do-info）
 haskell-mode-map（kbdCc Cn c）'haskell-process-cabal））
（eval-after-load'haskell-cabal'（progn 
（define-key haskell-cabal -mode-map（kbdC-`）'haskell-interactive-bring）
（define-key haskell-cabal-mode-map（kbdCc Ck）'haskell-interactive-ode-clear） 
（define-key haskell-cabal-mode-map（kbdCc Cc）'haskell-process-cabal-build）
（define-key haskell-cabal-mode-map（kbdCc c）'haskell-process-cabal）））
 
（custom-set-variables 
'（haskell-interactive-mode-hide-multi-line-errors nil）
'（haskell- process-log t）
'（haskell-process-type（quote cabal-repl）））
  

请注意与（引用cabal-repl）的部分 - 这应该与cabal沙箱配合使用。
此外，还将向名为 haskell-process-log 的缓冲区添加更多日志信息，您可以在其中找到有关您的问题的更多信息。

我使用这个与GHC 7.8.3 和GHC 7.8.3编译的 ghc-mod版本5.1.0.2。

当然，您必须确保您的 .cabal 文件夹和 ghc-mod 的位置在您的路径（我认为您可以在emacs设置中的某个地方进行配置，但这样做会更容易）。

备注

• 您必须在emacs中安装软件包 ghc 不是 ghc-mod 。


• 我有不同版本的ghc-mod和emacs包之前的问题 - 所以请确保您获得最新的cabal-install，然后重新安装emacs-package只有解决ghc输出的问题，虽然在我身上）

进一步信息

如果这不能帮助你请自由

• 添加评论


• 看看 happy haskell programming page


• 有一个查看 emacs上的ghc wiki

在我的机器上运行的示例

我编辑了一个这样的示例文件：

然后我打Cc Cl并按y：

并接受文件夹（这是文件所在的位置）和任何其他问题与Ret - 现在你应该看到 * haskell * 缓冲区带有友好的邮件/ lambda：

最后我可以检查该文件是否有adid：

Hi i am starting with haskell and trying to set up my emacs for its development.

I have haskell-mod and ghc-mod latest in emacs 24.3.1. GHC is 7.6.3

i have created a haskell file first.hs and when i do C-c C-l It asks :

start a new project named haskell ? y or n

my directory name is haskell. I press y

Set the cabal directory

I have tried with both ~/.cabal and my current directory named haskell

Set the current directory

Just pressed enter as it has haskell directory

It shows error messages :

haskell-process-start: cl-ecase failed: cabal-rep, (ghci quote cabal-repl quote cabal-ghci quote cabal-dev quote)

How can i get the repl ?

I read that i may need to downgrad the ghc version to make it work. Is that good solution ?

Solution :

I had multiple custom-set-variables in init.el and it led to the problem.

解决方案

UPDATE 2017

now that we have Intero I would suggest you try Intero/Stack - it works rather well.

With it my config is slimmed even more down:

;; ----------------------------------------------------------------------
;; HASKELL
(require 'haskell-mode)
(require 'intero)
(add-hook 'haskell-mode-hook 'intero-mode)
(require 'flycheck)
(setq flycheck-check-syntax-automatically '(save new-line))
(flycheck-add-next-checker 'intero '(warning . haskell-hlint))

Concerning the REPL you basically just load the file and then C-c C-l into the repl (you can always switch between the two windows with C-c C-z and you can clear out the repl-buffer with C-c C-k (when inside).

The only drawback is that Intero is usually installed locally in your project, so the first startup into a new project will take a while for Intero to download/compile/boot-up - but it's no big deal and you gain much.

---

UPDATE

Now that stack is out and running great I would recommend setting the haskell-process-type to auto and maybe installing ghc-mod using stack.

here is the current setup I am using:

(require 'haskell-mode)
(add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode)
(add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)
(add-hook 'haskell-mode-hook 'linum-mode)
(add-to-list 'exec-path "~/.local/bin")
(eval-after-load 'haskell-mode '(progn
  (define-key haskell-mode-map (kbd "C-c C-l") 'haskell-process-load-file)
  (define-key haskell-mode-map (kbd "C-c C-n C-t") 'haskell-process-do-type)
  (define-key haskell-mode-map (kbd "C-c C-n C-i") 'haskell-process-do-info)
  (define-key haskell-mode-map "\C-ch" 'haskell-hoogle)))
(eval-after-load 'haskell-cabal '(progn
  (define-key haskell-cabal-mode-map (kbd "C-c C-k") 'haskell-interactive-ode-clear)
  (define-key haskell-cabal-mode-map (kbd "C-c C-c") 'haskell-process-cabal-build)
  (define-key haskell-cabal-mode-map (kbd "C-c c") 'haskell-process-cabal)))

(require 'company-ghci)
(push 'company-ghci company-backends)
(add-hook 'haskell-mode-hook 'company-mode)
(add-hook 'haskell-interactive-mode-hook 'company-mode)

As you can see I basically got rid of all ghc-mod related stuff (stack works as is with the current haskell-mode) and replaced the company backend (although this one is really slow and I hope to find something better)

variables

Theses you usually set within Emacs/Configuration of Haskell-Mode

(custom-set-variables
 ;; there is of course more in here - these are the Haskell related:
 '(haskell-font-lock-symbols (quote unicode))
 '(haskell-hoogle-command nil)
 '(haskell-mode-hook
   (quote
    (linum-mode turn-on-haskell-indentation turn-on-haskell-doc-mode)) t)
 '(haskell-process-auto-import-loaded-modules t)
 '(haskell-process-load-or-reload-prompt t)
 '(haskell-process-log t)
 '(haskell-process-suggest-language-pragmas nil)
 '(haskell-process-suggest-no-warn-orphans t)
 '(haskell-process-type (quote auto))
 '(haskell-process-use-presentation-mode t)
 '(haskell-tags-on-save t)
 '(inferior-haskell-wait-and-jump t)
 '(safe-local-variable-values
   (quote
    ((haskell-process-use-ghci . t)
     (haskell-indent-spaces . 4))))
 (uniquify)))

These are the packages I added:

• haskell-mode
• company (not Haskell-related as is but a dependency)
• company-cabal
• company-ghci
• ghci-completion
• shakespeare-mode (for Yesod)
• company-quickhelp (for nice display of :i)

---

First

if it asks for your cabal directory - it wants to know where your myProject.cabal file is - if you don't have one just take the folder where your file is (the default - I think the default/find never failed me till now).

in case you need some sample-.emacs-setup

Here are parts from my .emacs file that works for me:

(autoload 'ghc-init "ghc" nil t)
(autoload 'ghc-debug "ghc" nil t)
(add-hook 'haskell-mode-hook (lambda () (ghc-init)))
(add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)

(eval-after-load 'haskell-mode '(progn
  (define-key haskell-mode-map (kbd "C-c C-l") 'haskell-process-load-or-reload)
  (define-key haskell-mode-map (kbd "C-`") 'haskell-interactive-bring)
  (define-key haskell-mode-map (kbd "C-c C-n C-t") 'haskell-process-do-type)
  (define-key haskell-mode-map (kbd "C-c C-n C-i") 'haskell-process-do-info)
  (define-key haskell-mode-map (kbd "C-c C-n C-c") 'haskell-process-cabal-build)
  (define-key haskell-mode-map (kbd "C-c C-n c") 'haskell-process-cabal)))
(eval-after-load 'haskell-cabal '(progn
  (define-key haskell-cabal-mode-map (kbd "C-`") 'haskell-interactive-bring)
  (define-key haskell-cabal-mode-map (kbd "C-c C-k") 'haskell-interactive-ode-clear)
  (define-key haskell-cabal-mode-map (kbd "C-c C-c") 'haskell-process-cabal-build)
  (define-key haskell-cabal-mode-map (kbd "C-c c") 'haskell-process-cabal)))

(custom-set-variables
 '(haskell-interactive-mode-hide-multi-line-errors nil)
 '(haskell-process-log t)
 '(haskell-process-type (quote cabal-repl)))

Please note the part with (quote cabal-repl) - this should work with cabal sandboxes. Also this will add more logging information to a buffer named haskell-process-log where you might find more about your problem.

I use this with ghc-mod version 5.1.0.2 compiled by GHC 7.8.3 and GHC 7.8.3 obviously.

Of course you have to make sure that your .cabal folder and the place where ghc-mod is in your path (I think you can configure this somewhere in the emacs settings too - but it's much easier this way).

remarks

• you have to install the package ghc in emacs not ghc-mod.
• I had problems with different version of ghc-mod and the emacs package before - so make sure that you get the latest with cabal-install and then reinstall the emacs-package (was only problems with parsing of the ghc-output on my part though)

further information

If this does not help you please feel free to

• add a comment
• have a look at the happy haskell programming page
• have a look at the ghc wiki on emacs

sample run on my machine

I edited a sample file like this:

Then I hit C-c C-l and press y:

And accept the folder (this is where the file is located) and any other questions with Ret - now you should see the *haskell* buffer with a friendly message/lambda:

Finally I can check that the file got loaded:

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