feat(format/html): implement bracketSameLine

crates/biome_html_formatter/src/html/auxiliary/opening_element.rs

@@ -36,14 +36,30 @@ impl FormatNodeRule<HtmlOpeningElement> for FormatHtmlOpeningElement {
             r_angle_token,
         } = node.as_fields();
 
+        let bracket_same_line = f.options().bracket_same_line().value();
         write!(f, [l_angle_token.format(), name.format()])?;
-        if attributes.len() > 0 {
-            write!(f, [space(), attributes.format()])?
-        }
-        // When these tokens are borrowed, they are managed by the sibling `HtmlElementList` formatter.
-        if !self.r_angle_is_borrowed {
-            write!(f, [r_angle_token.format()])?;
-        }
+
+        let attr_group_id = f.group_id("element-attr-group-id");
+        write!(
+            f,
+            [&group(&format_with(|f| {
+                attributes.format().fmt(f)?;
+
+                // Whitespace sensitivity takes precedence over bracketSameLine for correctness.
+                //
+                // The r_angle is placed inside this group because prettier always includes this token
+                // in the same group as the attributes, unless the token is being borrowed.
+                // When these tokens are borrowed, they are managed by the sibling `HtmlElementList` formatter.
+                if !bracket_same_line {
+                    write!(f, [soft_line_break()])?;
+                }
+                if !self.r_angle_is_borrowed {
+                    write!(f, [r_angle_token.format()])?;
+                }
+                Ok(())
+            }))
+            .with_group_id(Some(attr_group_id))]
+        )?;
 
         Ok(())
     }

crates/biome_html_formatter/src/html/auxiliary/self_closing_element.rs

@@ -12,24 +12,42 @@ impl FormatNodeRule<HtmlSelfClosingElement> for FormatHtmlSelfClosingElement {
             slash_token,
             r_angle_token,
         } = node.as_fields();
+        let bracket_same_line = f.options().bracket_same_line().value();
 
+        write!(f, [l_angle_token.format(), name.format(), space()])?;
+
+        let attr_group_id = f.group_id("element-attr-group-id");
         write!(
             f,
-            [
-                l_angle_token.format(),
-                name.format(),
-                space(),
-                attributes.format(),
-                space(),
-            ]
-        )?;
+            [&group(&format_with(|f| {
+                attributes.format().fmt(f)?;
+
+                // Whitespace sensitivity takes precedence over bracketSameLine for correctness.
+                //
+                // The r_angle is placed inside this group because prettier always includes this token
+                // in the same group as the attributes, unless the token is being borrowed.
+                // When these tokens are borrowed, they are managed by the sibling `HtmlElementList` formatter.
+                if bracket_same_line {
+                    write!(f, [hard_space()])?;
+                } else {
+                    write!(f, [soft_line_break_or_space()])?;
+                }
 
-        if slash_token.is_some() {
-            write!(f, [slash_token.format()])?;
-        } else {
-            write!(f, [text("/")])?;
-        }
+                // TODO: These tokens (the `/>`) are not yet borrowed by sibling elements for whitespace sensitivity.
+                // To resolve this, these tokens either need to be passed to or deferred to sibling text elements when
+                // whitespace sensitivity would require it.
+                if slash_token.is_some() {
+                    write!(f, [slash_token.format()])?;
+                } else {
+                    write!(f, [text("/")])?;
+                }
+
+                write!(f, [r_angle_token.format()])?;
+                Ok(())
+            }))
+            .with_group_id(Some(attr_group_id))]
+        )?;
 
-        write!(f, [r_angle_token.format()])
+        Ok(())
     }
 }

crates/biome_html_formatter/src/html/lists/attribute_list.rs

@@ -6,22 +6,32 @@ pub(crate) struct FormatHtmlAttributeList;
 impl FormatRule<HtmlAttributeList> for FormatHtmlAttributeList {
     type Context = HtmlFormatContext;
     fn fmt(&self, node: &HtmlAttributeList, f: &mut HtmlFormatter) -> FormatResult<()> {
-        let attribute_len = node.iter().len();
-        let line_break = if f.options().attribute_position() == AttributePosition::Multiline
-            && attribute_len > 1
+        let attribute_count = node.len();
+        let attribute_seperator = if f.options().attribute_position()
+            == AttributePosition::Multiline
+            && attribute_count > 1
         {
             hard_line_break()
         } else {
             soft_line_break_or_space()
         };
 
-        write!(
-            f,
-            [&group(&soft_block_indent(&format_with(|f| {
-                f.join_with(&line_break)
-                    .entries(node.iter().formatted())
-                    .finish()
-            })))]
-        )
+        if attribute_count > 0 {
+            write!(
+                f,
+                [
+                    space(),
+                    &soft_line_indent_or_space(&format_with(|f| {
+                        f.join_with(&attribute_seperator)
+                            .entries(node.iter().formatted())
+                            .finish()?;
+
+                        Ok(())
+                    }))
+                ]
+            )?;
+        }
+
+        Ok(())
     }
 }

crates/biome_html_formatter/tests/specs/html/elements/bracket-same-line/element.html

@@ -0,0 +1,9 @@
+<div
+  id="hello"
+  class="world really-long-class-name another-really-long-class-name"
+  style="color: red"
+  data-foo="bar"
+  data-bar="foo"
+>
+  hello world
+</div>

crates/biome_html_formatter/tests/specs/html/elements/bracket-same-line/element.html.snap

@@ -0,0 +1,68 @@
+---
+source: crates/biome_formatter_test/src/snapshot_builder.rs
+info: elements/bracket-same-line/element.html
+---
+# Input
+
+```html
+<div
+  id="hello"
+  class="world really-long-class-name another-really-long-class-name"
+  style="color: red"
+  data-foo="bar"
+  data-bar="foo"
+>
+  hello world
+</div>
+
+```
+
+
+=============================
+
+# Outputs
+
+## Output 1
+
+-----
+Indent style: Tab
+Indent width: 2
+Line ending: LF
+Line width: 80
+Attribute Position: Auto
+Bracket same line: false
+Whitespace sensitivity: strict
+Indent script and style: false
+-----
+
+```html
+<div
+	id="hello"
+	class="world really-long-class-name another-really-long-class-name"
+	style="color: red"
+	data-foo="bar"
+	data-bar="foo"
+>hello world</div>
+```
+
+## Output 1
+
+-----
+Indent style: Tab
+Indent width: 2
+Line ending: LF
+Line width: 80
+Attribute Position: Auto
+Bracket same line: true
+Whitespace sensitivity: strict
+Indent script and style: false
+-----
+
+```html
+<div
+	id="hello"
+	class="world really-long-class-name another-really-long-class-name"
+	style="color: red"
+	data-foo="bar"
+	data-bar="foo">hello world</div>
+```

crates/biome_html_formatter/tests/specs/html/elements/bracket-same-line/options.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "../../../../../../../../packages/@biomejs/biome/configuration_schema.json",
+  "formatter": {
+    "bracketSameLine": true
+  }
+}

crates/biome_html_formatter/tests/specs/html/elements/bracket-same-line/self-closing.html

@@ -0,0 +1,7 @@
+<selfclosing
+  id="hello"
+  class="world"
+  style="color: red"
+  data-foo="bar"
+  data-bar="foo"
+/>

crates/biome_html_formatter/tests/specs/html/elements/bracket-same-line/self-closing.html.snap

@@ -0,0 +1,66 @@
+---
+source: crates/biome_formatter_test/src/snapshot_builder.rs
+info: elements/bracket-same-line/self-closing.html
+---
+# Input
+
+```html
+<selfclosing
+  id="hello"
+  class="world"
+  style="color: red"
+  data-foo="bar"
+  data-bar="foo"
+/>
+
+```
+
+
+=============================
+
+# Outputs
+
+## Output 1
+
+-----
+Indent style: Tab
+Indent width: 2
+Line ending: LF
+Line width: 80
+Attribute Position: Auto
+Bracket same line: false
+Whitespace sensitivity: strict
+Indent script and style: false
+-----
+
+```html
+<selfclosing
+	id="hello"
+	class="world"
+	style="color: red"
+	data-foo="bar"
+	data-bar="foo"
+/>
+```
+
+## Output 1
+
+-----
+Indent style: Tab
+Indent width: 2
+Line ending: LF
+Line width: 80
+Attribute Position: Auto
+Bracket same line: true
+Whitespace sensitivity: strict
+Indent script and style: false
+-----
+
+```html
+<selfclosing
+	id="hello"
+	class="world"
+	style="color: red"
+	data-foo="bar"
+	data-bar="foo" />
+```