Use filter-buffer-substring to get buffer text #482

muffinmad · 2020-05-18T10:02:44Z

Python file:

int

textDocument/hover response:

(:id 44 :jsonrpc "2.0" :result
     (:contents
      (:kind "markdown" :value "```python\nint(x: Union[Text, bytes, SupportsInt, _SupportsIndex]=...)\nint(x: Union[Text, bytes, bytearray], base: int)\n```\n\n```\nint([x]) -> integer\nint(x, base=10) -> integer\n\nConvert a number or string to an integer, or return 0 if no arguments\nare given.  If x is a number, return x.__int__().  For floating point\nnumbers, this truncates towards zero.\n\nIf x is not a number or if base is given, then x must be a string,\nbytes, or bytearray instance representing an integer literal in the\ngiven base.  The literal can be preceded by '+' or '-' and be surrounded\nby whitespace.  The base defaults to 10.  Valid bases are 0 and 2-36.\nBase 0 means to interpret the base from the string as an integer literal.\n>>> int('0b100', base=0)\n4\n```")
      :range nil))

With default eglot settings the following message is shown in the echo area:

[eglot]
(...truncated. Full help is in `*eglot-help for int*')

Codeblock markers are invisible in gfm-view-mode and mostly useless after font faces are applied to the text.

This PR removes codeblock markers from the hover info.

joaotavora

No, sorry. Eglot should not be the receptacle of improvements that belong in other parts of Emacs or other packages, even if it's a kind of "soft depedency" such as Markdown. This is especially important as Eglot moves closer to the core of Emacs.

joaotavora · 2020-05-18T10:16:21Z

eglot.el

      (ignore-errors (delay-mode-hooks (funcall mode)))
      (font-lock-ensure)
-      (buffer-string))))
+      (when (eq major-mode 'gfm-view-mode)


This is too much for eglot.el, @muffinmad, sorry. IT's clearly something that is to be done in the server, in gfm-view-mode, or maybe in a user hook. But I think you should contribute this to gfm-view-mode.

I see. Would it be fine for eglot to use filter-buffer-substring instead of buffer-string here? In this case gfm-view-mode (among other modes) can provide own filter-buffer-substring-function.

I didn't know about that function, but that sounds very good in principle, yes.

This way modes used to represent hover info text can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'.

muffinmad · 2020-05-18T11:23:33Z

~~This PR removes codeblock markers from the hover info.~~

This PR allows major modes, used to format the hover info text, to filter the text.

joaotavora · 2020-05-18T11:42:39Z

I think this PR now makes sense. However, it is too soon to merge it, probably. I'll make the most sense when gfm-view-mode starts supporting this: have you contacted its authors? Or are you planning to set your own filter from your .emacs? What would this filter look like?

muffinmad · 2020-05-18T19:59:03Z

I think this PR now makes sense. However, it is too soon to merge it, probably.

OK, no problem.

I'll make the most sense when gfm-view-mode starts supporting this: have you contacted its authors?

Not yet.

Or are you planning to set your own filter from your .emacs? What would this filter look like?

Something like this

(defun test/filter (start end &optional delete)
  (replace-regexp-in-string "^```.*\n*?" ""
                            (buffer-substring start end)))

(add-hook 'gfm-view-mode-hook
          (lambda ()
            (setq-local filter-buffer-substring-function
                        #'test/filter)))

But this will not work because of delay-mode-hooks, right?

joaotavora · 2020-05-18T20:03:57Z

But this will not work because of delay-mode-hooks, right?

You lost me :-)

muffinmad · 2020-05-18T20:29:01Z

You lost me :-)

Sorry :) My local .emacs solution add the hook for gfm-view-mode. That hook will set the filter-buffer-substring-function local variable to test/filter function that will be used to filter buffer text. But that hook will not be called because gfm-view-mode is enabled with delay-mode-hooks in the eglot--format-markup function.

Here is another way to make it solely in eglot without dependency on third-party modules :-) E.g.

(let ((filter-buffer-substring-function eglot-filter-help-buffer-function))
  (filter-buffer-substring (point-min) (point-max)))

Then the eglot-filter-help-buffer-function variable can be 'identity by default and users can write their own filter functions. Doesn't really like this solution bacouse in this case we need to add questionable user option to eglot.

muffinmad · 2020-05-18T20:45:48Z

Too bad there are no something like buffer-string-only-visible function in Emacs.

joaotavora · 2020-05-18T21:48:42Z

bah. vc-region-history worked perfectly:

commit 2ab8b59db44fd4dd9791ac203ac9f0915cc6824f
Author: Xu Chunyang <[email protected]>
Date:   Sun Oct 27 23:41:53 2019 +0800

    Don't run mode hooks in eglot--format-markup
    
    * eglot.el (eglot--format-markup): Use delay-mode-hooks.
    
    Copyright-paperwork-exempt: yes

diff --git a/eglot.el b/eglot.el
--- a/eglot.el
+++ b/eglot.el
@@ -1086,1 +1086,1 @@
-      (ignore-errors (funcall mode)) (font-lock-ensure) (buffer-string))))
+      (ignore-errors (delay-mode-hooks (funcall mode)))

But smart old me forgot to include a reference to the issue that would have explained why delay-mode-hooks is there in the first place...

joaotavora · 2020-05-18T21:57:11Z

Got it, it's #327. The delay-mode-hooks is there because of "normal", programming major modes, which normally contains looks of user hooks. We could remove it for gfm-view-mode, and so your hook would work. But the correct version is to contact the authors of gfm-view-mode anyway, and if you really want a hook that works regardless of delay-mode-hooks, just use add-function and it will do the trick.

muffinmad · 2020-05-18T21:57:27Z

I'm mostly use vc-annotate for such cases ;-)

Call of delay-mode-hooks function is in it's place. We don't need to run all those mode hooks to just apply font faces.

muffinmad · 2020-05-18T21:59:55Z

But the correct version is to contact the authors of gfm-view-mode anyway, and if you really want a hook that works regardless of delay-mode-hooks, just use add-function and it will do the trick.

Absolutely agree. Thanks for the tips!

joaotavora · 2020-05-18T22:00:05Z

I'm mostly use vc-annotate for such cases ;-)

Yeah, but that annotates the whole buffer. I like vc-region-history much better, personally.

muffinmad · 2020-05-26T15:09:07Z

But the correct version is to contact the authors of gfm-view-mode

filter-buffer-substring-function is now implemented in both markdown-view-mode and gfm-view-mode. See jrblevin/markdown-mode#494.

joaotavora · 2020-05-26T16:27:15Z

filter-buffer-substring-function is now implemented in both markdown-view-mode and gfm-view-mode

Nice, but what does that mean for us?

muffinmad · 2020-05-26T19:15:19Z

filter-buffer-substring-function is now implemented in both markdown-view-mode and gfm-view-mode

Nice, but what does that mean for us?

That means to us that this PR must be merged immediately ;-) And make eglot respect filter-buffer-substring-function provided by the major mode used to present the hover info to happy eglot users!

joaotavora · 2020-05-26T20:04:50Z

Andrii Kolomoiets <[email protected]> writes:

filter-buffer-substring-function is now implemented in both markdown-view-mode and gfm-view-mode Nice, but what does that mean for us? That means to us that this PR must be merged immediately ;-) And make eglot respect filter-buffer-substring-function provided by the major mode used to present the hover info to happy eglot users!

Doh. Sorry, I got confused. Merged.

This was introduced in joaotavora#482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Fixes joaotavora#865. * eglot.el (eglot--format-markup): Don't use 'filter-buffer-substring'; instead, keep invisible text.

This was introduced in #482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Per #866 * eglot.el (eglot--format-markup): Use buffer-string instead of filter-buffer-substring

… text This way modes used to represent hover info text, such as gfm-view-mode can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'.

…hover string This was introduced in joaotavora/eglot#482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Per joaotavora/eglot#866 * eglot.el (eglot--format-markup): Use buffer-string instead of filter-buffer-substring

… text This way modes used to represent hover info text, such as gfm-view-mode can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'.

…hover string This was introduced in joaotavora/eglot#482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Per joaotavora/eglot#866 * eglot.el (eglot--format-markup): Use buffer-string instead of filter-buffer-substring

This way modes used to represent hover info text, such as gfm-view-mode can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'. #482: joaotavora/eglot#482

This was introduced in #482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Per #866 * eglot.el (eglot--format-markup): Use buffer-string instead of filter-buffer-substring #865: joaotavora/eglot#865 #482: joaotavora/eglot#482 #866: joaotavora/eglot#866

This way modes used to represent hover info text, such as gfm-view-mode can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'. GitHub-reference: close joaotavora/eglot#482

This was introduced in joaotavora/eglot#482 due to a bad interaction with a specific server. But this solution makes hyperlinks in Eldoc buffers unclickable, because the markdown-mode function that visits a link relies on the invisible text. Per joaotavora/eglot#866 * eglot.el (eglot--format-markup): Use buffer-string instead of filter-buffer-substring GitHub-reference: fix joaotavora/eglot#865

joaotavora reviewed May 18, 2020

View reviewed changes

Use filter-buffer-substring to get buffer text

7de813b

This way modes used to represent hover info text can e.g. filter out invisible text by providing own `filter-buffer-substring-function'. * eglot.el (eglot--format-markup): Use `filter-buffer-substring'.

muffinmad force-pushed the markdown-invisible branch from 4f02e4b to 7de813b Compare May 18, 2020 11:18

muffinmad changed the title ~~Remove invisible markdown text from hover info~~ Use filter-buffer-substring to get buffer text May 18, 2020

joaotavora merged commit 9874456 into joaotavora:master May 26, 2020

muffinmad deleted the markdown-invisible branch May 27, 2020 08:28

astoff mentioned this pull request Mar 9, 2022

Hyperlinks from markdown hover text are unclickable #865

Closed

astoff mentioned this pull request Mar 9, 2022

Don't strip invisible text when formatting hover string #866

Merged

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Use filter-buffer-substring to get buffer text #482

Use filter-buffer-substring to get buffer text #482

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Use filter-buffer-substring to get buffer text #482

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