Debugger support

[warrenharris]

I'd like to see haskell-mode support better integration with the ghci debugger -- mode key bindings for stepping, tracing, printing, etc, and highlighting of the current source location in the source buffer.

[chrisdone]

In inf-haskell or haskell-interactive-mode?

[warrenharris]

inf-haskell might make more sense, if you think of the inferior ghci process as analogous to running gdb in emacs. I guess I care most about highlighting source file locations as stepping occurs, more than key bindings for those commands.

On Apr 26, 2012, at 1:19 PM, Chris Done wrote:

In inf-haskell or haskell-interactive-mode?

---

Reply to this email directly or view it on GitHub:
#32 (comment)

[chrisdone]

I meant the new interactive mode or the inf-haskell mode. I maintain the new one, not the old one. I've already done debugger stepping while playing around, it's not a big deal to add support to highlight source locations and step.

Otherwise maybe someone else will implement such support for inf-haskell.

[warrenharris]

Ah... I thought you took over development of the old one, and I'm just not on the latest version yet. I will switch over to yours and give it a try. I'd be happy to test any source highlighting features you add. Thanks,

Warren

On Apr 26, 2012, at 1:32 PM, Chris Done wrote:

I meant the new interactive mode or the inf-haskell mode. I maintain the new one, not the old one. I've already done debugger stepping while playing around, it's not a big deal to add support to highlight source locations and step.

---

Reply to this email directly or view it on GitHub:
#32 (comment)

[warrenharris]

Hi Chris,

I'm trying your new haskell-mode now with GNU Emacs 24.0.95.1 (x86_64-apple-darwin, NS apple-appkit-1038.36) of 2012-04-02 on bob.porkrind.org -- so good so far! One minor bug I've seen though: The first time I C-c C-l a buffer, I get a message saying "No buffer named /Users/warrenharris/....cabal" even though I do have a buffer with that name opened. The second C-c C-l has no problem finding it. It seems to happen with every new .hs file I open/eval.

I'm excited to try out some of your new features. I guess I'll have to watch that video again. :-)

Warren

On Apr 26, 2012, at 1:54 PM, Warren Harris wrote:

Ah... I thought you took over development of the old one, and I'm just not on the latest version yet. I will switch over to yours and give it a try. I'd be happy to test any source highlighting features you add. Thanks,

Warren

On Apr 26, 2012, at 1:32 PM, Chris Done wrote:

I meant the new interactive mode or the inf-haskell mode. I maintain the new one, not the old one. I've already done debugger stepping while playing around, it's not a big deal to add support to highlight source locations and step.

---

Reply to this email directly or view it on GitHub:
#32 (comment)

[chrisdone]

I think C-c C-l is the old inf-haskell binding. Other people have had this problem, you have to rebind it to my stuff.

[warrenharris]

On Apr 26, 2012, at 11:41 PM, Chris Done wrote:

I think C-c C-l is the old inf-haskell binding. Other people have had this problem, you have to rebind it to my stuff.

I'm not sure I understand. I removed my old haskell-mode and then followed the instructions on your github site to install your new stuff. What else do I have to do to enable it?

Warren

[chrisdone]

What does C-h k C-c C-l give in a Haskell buffer?

[warrenharris]

Something must be very wrong. C-h is the same as Delete on my system. (backward-delete-char-untabify)

I see in the instructions that it says "A new mode for the REPL and GHCi sessions is called haskell-interactive-mode..." I had assumed that this would be in effect simply by loading the new haskell-site-file.el. When I try to set this mode with M-x haskell-interactive-mode, I get an error:

Wrong number of arguments: (lambda (session) "Interactive mode for Haskell." (interactive) (kill-all-local-variables) (haskell-session-assign session) (use-local-map haskell-interactive-mode-map) (set (make-local-variable (quote haskell-interactive-mode)) t) (setq major-mode (quote haskell-interactive-mode)) (setq mode-name "Interactive-Haskell") ...), 0

Here's my .emacs setup:

(load "~/.emacs.d/site-lisp/haskell-interactive-mode/haskell-site-file")
(add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode)
(add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)
(add-hook 'haskell-mode-hook 'turn-on-haskell-indent)
;;(add-hook 'haskell-mode-hook 'turn-on-haskell-simple-indent)
(add-hook 'haskell-mode-hook 'font-lock-mode)

(setq haskell-program-name "/usr/local/bin/ghci") ; couldn't seem to find this from my path

(add-hook 'haskell-mode-hook
(lambda()
(add-hook 'before-save-hook
'delete-trailing-whitespace nil t)))

Thanks for any help you can provide,

Warren

On Apr 28, 2012, at 3:05 AM, Chris Done wrote:

What does C-h k C-c C-l give?

---

Reply to this email directly or view it on GitHub:
#32 (comment)

[chrisdone]

I assume haskell-interactive-mode/haskell-site-file is the haskell-site-file from the normal haskell-mode repo. You also need to load examples/init.el which will rebind some stuff for the new one. Try that and then C-c C-l should be rebound to haskell-process-load-file.

C-h as delete is, uh, crazy. Your system is definitely odd.

[warrenharris]

Ok, I found the C-h binding in my 20+ yr old .emacs file. :-) Now I can tell you that C-h k C-c C-l says this:

C-c C-l runs the command inferior-haskell-load-file, which is an
interactive Lisp function in `inf-haskell.el'.

It is bound to C-c C-l, .

(inferior-haskell-load-file &optional RELOAD)

Pass the current buffer's file to the inferior haskell process.
If prefix arg C-u is given, just reload the previous file.

I also loaded your example/init.el file and the binding for C-c C-l is the same. Turns out that this has to be done before the haskell-mode-hook triggers. Your instructions didn't actually say that you need to load examples/init.el to get the new stuff to work. Since it was just "examples" I ignored it.

After fixing this problem (and getting C-c C-l set to haskell-process-load-file) I see that C-c C-l doesn't work without cabal-dev. It would be nice if there was an option to run it with standard cabal. I tried setting haskell-process-path-cabal-dev, but no-go. The README should say you need this too. I'll install it and try again later.

Sorry if I expect this to be a drop-in replacement for the old haskell-mode. I see now that it takes some tweaking.

Warren

On Apr 28, 2012, at 11:40 AM, Chris Done wrote:

I assume haskell-interactive-mode/haskell-site-file is the haskell-site-file from the normal haskell-mode repo. You also need to load examples/init.el which will rebind some stuff for the new one. Try that and then C-c C-l should be rebound to haskell-process-load-file.

C-h as delete is, uh, crazy. Your system is definitely odd.

---

Reply to this email directly or view it on GitHub:
#32 (comment)

[chrisdone]

From the docs:

To make use of them, try out the instructions in examples/init.el. WARNING: The features expressed in here are new and many are Linux-specific.

Note: These features are entirely orthogonal to the older inferior-haskell-mode, and therefore keybindings which work for inferior-haskell-mode will not magically work for the above new modules.

Set haskell-process-type to 'ghci and it will use normal cabal.

[gracjan]

This issue is 3 years old and it seems that haskell-mode has moved forward significantly. Write a note here and we will reopen if you feel this is still up to date.