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Hide the theme without comments.php deprecation message #28128

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merged 4 commits into from
Jan 13, 2021

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youknowriad
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@youknowriad youknowriad commented Jan 12, 2021

closes #28045

Block-based Themes throw up a depreciation warning if they do not include a comments.php file:

Deprecated: Theme without comments.php is deprecated since version 3.0.0 with no alternative available. Please include a comments.php template in your theme. in /var/www/html/wp-includes/functions.php on line 5059

I'm not very proud of what I did to achieve the removal of this deprecation but at the moment, I don't see any other way to do it. Open to suggestions

Testing instructions

  • Have an FSE theme without comments.php file
  • Add a "Post comments" block to any post
  • Check the frontend
  • You shouldn't see the deprecation message.

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Size Change: -319 B (0%)

Total Size: 1.28 MB

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@swissspidy
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Have you considered adding a temporary filter to core to allow Gutenberg to disable the deprecation message in a nicer way? For example in locate_template. (example precedence)

At some point it will need a core solution anyway once FSE themes take off.

header.php, footer.php, and sidebar.php have similar deprecation warnings in WordPress. What about those?

@youknowriad
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@swissspidy yes, my idea was to avoid touching core yet, because FSE is still experimental right and it's unclear whether the block will continue to exist as is or be refactored later to be something closer to the Query block (we might have both)

So if we do keep this in FSE when the landing to Core is close, we should probably just remove the deprecation in Core for fie-themes. (add a check there)

@youknowriad
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header.php, footer.php, and sidebar.php have similar deprecation warnings in WordPress. What about those?

These are not used at in FSE themes, comment.php is used by the Post Comments block.

@mcsf
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mcsf commented Jan 13, 2021

Looking at _deprecated_file in wp-includes/functions.php, it seems like it would be possible to:

  1. Add an action for deprecated_file_included to capture the $file in a stack.
  2. Add a filter for deprecated_file_trigger_error which will pop $file from the stack and match it against "comments.php". If it matches, the filter returns false.

This isn't very elegant for two reasons:

  • The filter doesn't pass any data, so we have to juggle it with the action.
  • The compatibility logic in wp-includes/theme-compat/comments.php responsible for calling _deprecated_file is arguably abusing the hook by passing a translated string as $file, which means that we can't simply check for $file == 'comments.php, but rather do a partial string match and hope that the current locale isn't interfering with the string.

But it should nevertheless work reliably and without having to introduce new hooks or manipulate the server response in post-comments/index.php. Am I missing something?

@gziolo
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gziolo commented Jan 13, 2021

2. Add a filter for deprecated_file_trigger_error which will pop $file from the stack and match it against "comments.php". If it matches, the filter returns false.

It might be simpler in terms of readability to disable and enable this filter around comments_template(); call. It's a temporary solution for a few weeks, right?

@mcsf
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mcsf commented Jan 13, 2021

It might be simpler in terms of readability to disable and enable this filter around comments_template(); call. It's a temporary solution for a few weeks, right?

I'm ok with that :)

@youknowriad
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I like the filter's approach. Thanks :)

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@youknowriad youknowriad merged commit e92f868 into master Jan 13, 2021
@youknowriad youknowriad deleted the remove/comment-deprecation-message branch January 13, 2021 12:15
@github-actions github-actions bot added this to the Gutenberg 9.8 milestone Jan 13, 2021
@mtias
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mtias commented Jan 18, 2021

Do we have an issue opened to figure out what to do with the comments template more broadly? We should avoid comments_template in general. cc @scruffian

@youknowriad
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@mtias there's this issue to explore a comments block similar to the query block #24101

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mtias commented Jan 18, 2021

Ah, great!

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Block-based themes without a comments file trigger a deprecation warning
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