Apostrophes count as unmatched delimiters

[anna-is-cute]

I noticed this in markdown filters, but it appears to happen on any text. Tested on emacs 28.0.50 and haml-mode commit bf5b6c1.

%div
  :markdown
    This is an apostrophe: '<>
  %span more elements

If the point is at <>, pressing enter will not indent the next line. Furthermore, trying to type an interpolation or use Ruby past this point will auto-escape further apostrophes.

= func(\'oh no')

or

:markdown
  Inlining a #{func(\'whoops')}!

This is not corrected until a matching apostrophe is added somewhere.

[purcell]

This doesn't happen in the latest stable Emacs release, so I'd have to guess that it's an Emacs HEAD bug, which is not uncommon.

[anna-is-cute]

Oh, I didn't even realise I wasn't on stable. Let me compile it real quick and make sure it's fixed.

[purcell]

That's not to say that some changes won't be needed for Emacs 28, but the release of that stream will probably be in about 15 months. :-)

[anna-is-cute]

I can confirm this happens on 27.0.91 and 26.3. Could be a conflict, but I'm not sure where to start looking.

[purcell]

Ah, sorry, I think I misread the issue you were seeing.

Regarding enter and indenting, it would be an anti-pattern for haml-mode to decide that you always wanted ENTER to indent. Emacs provides two commands: newline and newline-and-indent. I do this in my config:

(global-set-key (kbd "RET") 'newline-and-indent)

but you might prefer

(with-eval-after-load 'haml-mode
  (define-key haml-mode-map (kbd "RET") 'newline-and-indent))

Starting from the first snippet you posted, what would be the exact sequence of steps to reproduce the apostrophe issue? I can't seem to do that.

[anna-is-cute]

Sorry, to be clear, I expect enter to indent because I do have newline-and-indent enabled (this is the normal behaviour I see when apostrophes aren't unmatched).

For me, if I make a new file (C-x C-f something.haml RET), then type %p ', hit enter, then type = a(', the output will look like the below.

%p '
= a(\'

I expect for there not to be a backslash normally. I think that's about as minimal of a test case I can produce.

Packages enabled:

ws-butler haml-mode nhexl-mode lsp-mode rustic sql-indent web-mode dockerfile-mode yaml-mode flycheck base16-theme move-text ## company-quickhelp aggressive-indent smartparens mwim rainbow-delimiters anzu magit-lfs highlight-indent-guides magit ace-window atom-one-dark-theme company neotree

Edit:
I think this occurs because of smartparens-mode. I can't say I have this issue with any other mode combined with SP.

Edit 2:
The apostrophe escaping is SP, but the indent issue is not.

Here highlight-indent-guides shows the problem. If I were to hit enter with the apostrophe escaped, the new line would be indented. If I hit enter without it escaped, the new line is not indented (also reproduced without h-i-g on, but it's a useful indicator).

[purcell]

If I were to hit enter with the apostrophe escaped, the new line would be indented. If I hit enter without it escaped, the new line is not indented (also reproduced without h-i-g on, but it's a useful indicator).

With point (represented by |) before the apostrophe in your example, after hitting RET (newline-and-indent) I get:

%li
  %a{href: "#returners-hideout"} Returner\|'s Hideout

=>

%li
  %a{href: "#returners-hideout"} Returner\
  |'s Hideout

and

%li
  %a{href: "#returners-hideout"} Returner|'s Hideout

=>

%li
  %a{href: "#returners-hideout"} Returner
  |'s Hideout

So I suspect something else is going on in your config. I suggest you start emacs with -Q, M-x load-file on haml-mode.el, then try to repeat the experiment.

[anna-is-cute]

Aw, man, I apologise. The point has to be at the end of the line. I didn't realise it was in the wrong place in that screenshot. It was there so I could add the backslash back in.

Without the backslash, hitting enter at the end of the line places the point at the start of the next line. With, it behaves normally.

I can reproduce this by loading haml-mode after emacs -Q.

[purcell]

The point has to be at the end of the line.

Even then, I get the same behaviour with and without the backslash. And same with emacs -Q, so it's not my local config either.

What haml-mode version do you have? I'm using

;; Package-Version: 20190219.2102

[anna-is-cute]

%li
  %a{href: "#returners-hideout"} Returner's Hideout<>

That's what I'm testing in emacs -Q with the point at the <>.

haml-mode: 20190219.2102 installed
emacs: GNU Emacs 26.3

[purcell]

M-x newline-and-indent takes me from:

%li
  %a{href: "#returners-hideout"} Returner's Hideout<>|

to

%li
  %a{href: "#returners-hideout"} Returner's Hideout<>
  |

and from

%li
  %a{href: "#returners-hideout"} Returner\'s Hideout<>|

to

%li
  %a{href: "#returners-hideout"} Returner\'s Hideout<>
  |

[anna-is-cute]

Okay, my bad. I see now where the indent issue comes from, and it was that newline-and-indent was getting turned off for haml-mode.

Any idea why the syntax highlighting breaks after apostrophes? You can see it in the curly braces in the screenshots. Both highlight-indent-guides and some of the syntax highlighting has issues after apostrophes.