Do not make GHCi output read-only

[vshabanov]

In old haskell-mode I used to be able to clean GHCi output (completely, or just few lines). But when I'm trying to select whole buffer (or line) and remove it I get Text is read-only.

Sometimes there are really long lines of Haskell data (10-100k characters for example) in GHCi output. And they slowdowns Emacs a lot. Plus sometimes I'd like to see only latest "fixed" data and do not mess with previous output.

Is it possible to make GHCi output editable again?

[ivan-m]

I think one thing that will make this difficult is the existence of the *haskell-process-log* buffer which will also contain all of this text.

My current solution is to kill the process, kill the log buffer and start it again, but then you lose the history :/

[vshabanov]

It's my current solution too. But it takes a lot of additional actions and time to reload everything.

[fice-t]

It's possible to make the read-only property optional.

Does haskell-interactive-mode-clear (C-c C-k) not work for you here? That function also clears out the process log.

[vshabanov]

Thank you for the C-c C-k hint!

But I still would like to get more precise control. Sometimes I just want to select and remove a part of buffer: bad output, bad input with type errors, wrong input, too long output that obstructs the previous output.

And sometimes I'd like to copy a line using C-k. It actually works, line got copied, but it doesn't removed from buffer and there is a "Text is read only" warning, so it looks like it doesn't work.

In short I got used to old haskell-mode where output was easily editable and I could do anything with it.

[fice-t]

Alright. How fine-grained do you want the option to be? The easiest would be just a total on/off switch which all output (result, prompt, etc.) is either read-only or not. Or do you always want the prompt to be read-only?

there is a "Text is read only" warning, so it looks like it doesn't work.

Changing the variable kill-read-only-ok could also help.

[vshabanov]

Thank you again for kill-read-only-ok.

Just the all output. So I could edit it any way I want. If prompts will be still read-only I'm afraid there will be problems with deleting text containing prompts.

[fice-t]

#1444 makes most output optional. I might have been too cautious and left a couple functions output read-only text since they were documented as read-only. Though if it's not enough for you then those should be easily changeable.

[vshabanov]

I think it should be totally read-only or totally read-write. Now when I set haskell-interactive-mode-read-only to nil I still can't select and remove several lines of output since prompts are still read-only. When I also set haskell-interactive-prompt-read-only to nil it behaves exactly like I want.

[fice-t]

I put that distinction in to allow for more fine-tuning of the property. Though with that implementation, if you set haskell-interactive-mode-read-only before loading haskell-mode, then the prompt will be the same read-only state as most of the other output.

That is, the default value of haskell-interactive-prompt-read-only is the value of haskell-interactive-mode-read-only when that file is loaded.

Though what's probably going to happen is that haskell-interactive-mode-read-only will be removed and you just have to set the prompt variable.

[Icelandjack]

Use case: I would like to run json-mode-pretty-print-dwim on GHCi output.