Allow to maintain single/multi lines for html attribute

[rod24574575]

I found that this plugin would always format html with single attribute to single line when the line length does not exceed the print-width.

before:

<div 
  class="foo"
/>

after:

<div class="foo" />

Is there any config to change the behavior to maintain the original single/multi lines status, just like the default behavior of dprint's typescript plugin?

For example, dprint's typescript plugin would not change the format of the following code.

const a = { foo: 0 };
const b = {
    foo: 0,
};

[g-plane]

Does #42 help you? If so, add 👍 there.

[rod24574575]

No. That issue adds "preferSingleLineOpeningTag" to force single line for single attribute. However, I would like a formatter to maintain the single/multi lines as the original code.

That is, I would expect the following results.

before:

<div class="foo" />
<div 
  class="foo"
/>
<div class="foo"
  id="foo"
/>
<div
  class="foo" id="foo"
/>

after:

<div class="foo" />
<div 
  class="foo"
/>
<div class="foo" id="foo" />
<div
  class="foo"
  id="foo"
/>

[UnknownPlatypus]

@rod24574575 The behavior you are looking for can already be achieved if you have more than one attribute by inserting a newline before the first attr (if you have the setting preferAttrsSingleLine set to false, but it's the default).

For ex this will be formatted on a single line:

-<div class="foo"
-  id="foo"
-/>
+<div class="foo" id="foo" />

But this will be on multiple lines

-<div
-  class="foo" id="foo"
-/>
+<div
+  class="foo"
+  id="foo"
+/>

See playground

As for the single attribute use case, see #42 for discussions on the matter.
We ended up not making it configurable because we don't see compelling reasons to have a node with a single attr splat on multiple lines. We did make an exception if the attribute is initially on multiple lines tho (see this commit).