Add RsHtml template language support

SUPPORTED_LANGUAGES.md

@@ -250,6 +250,7 @@ jsx (queries only)[^jsx] | unstable | `HFIJ ` | @steelsojka
 [robots](https://github.com/opa-oz/tree-sitter-robots-txt) | unstable | `H  J ` | @opa-oz
 [roc](https://github.com/faldor20/tree-sitter-roc) | unstable | `H IJL` | @nat-418
 [ron](https://github.com/tree-sitter-grammars/tree-sitter-ron) | unstable | `HFIJL` | @amaanq
+[rshtml](https://github.com/rshtml/tree-sitter-rshtml) | unstable | `H  J ` | @rshtml
 [rst](https://github.com/stsewd/tree-sitter-rst) | unstable | `H  JL` | @stsewd
 [ruby](https://github.com/tree-sitter/tree-sitter-ruby) | unstable | `HFIJL` | @TravonteD
 [runescript](https://github.com/2004Scape/tree-sitter-runescript) | unstable | `H  J ` | @2004Scape

lua/nvim-treesitter/parsers.lua

@@ -1963,6 +1963,14 @@ return {
     maintainers = { '@amaanq' },
     tier = 2,
   },
+  rshtml = {
+    install_info = {
+      revision = '89ae0f3a5e221a83aad243def85e822616d3b3c2',
+      url = 'https://github.com/rshtml/tree-sitter-rshtml',
+    },
+    maintainers = { '@rshtml' },
+    tier = 2,
+  },
   rst = {
     install_info = {
       revision = '4e562e1598b95b93db4f3f64fe40ddefbc677a15',

runtime/queries/rshtml/highlights.scm

@@ -0,0 +1,114 @@
+(start_symbol) @keyword
+
+(hash_symbol) @punctuation.special
+
+(open_paren) @punctuation.bracket
+
+(close_paren) @punctuation.bracket
+
+(open_brace) @punctuation.bracket
+
+(close_brace) @punctuation.bracket
+
+(fat_arrow) @operator
+
+(semicolon) @punctuation.delimiter
+
+(equals) @punctuation.delimiter
+
+(string_line) @string
+
+(comment_block) @comment
+
+(open_comment) @operator
+
+(close_comment) @operator
+
+(continue_) @keyword.conditional
+
+(break_) @keyword.conditional
+
+((start_symbol) @keyword.import
+  .
+  (extends_) @keyword.import)
+
+(raw_) @keyword
+
+((start_symbol) @keyword.import
+  .
+  (include_directive
+    (include_) @keyword.import))
+
+(render_) @keyword
+
+(render_body_) @keyword
+
+(child_content_) @keyword
+
+(section_) @keyword
+
+(section_block
+  name: (rust_identifier) @module)
+
+(as_) @keyword.operator
+
+(as_clause
+  alias: (rust_identifier) @type)
+
+((start_symbol) @keyword.import
+  .
+  (use_directive
+    (use_) @keyword.import))
+
+(number) @number
+
+(bool) @boolean
+
+(tag_open) @punctuation.bracket
+
+(tag_close) @punctuation.bracket
+
+(tag_end_open) @punctuation.bracket
+
+(tag_self_close) @punctuation.bracket
+
+(component_tag
+  name: (component_tag_identifier) @tag)
+
+(component_tag
+  name_close: (component_tag_identifier) @tag)
+
+(component_tag_parameter
+  name: (rust_identifier) @variable.parameter)
+
+((start_symbol) @function.call
+  .
+  (rust_expr_simple))
+
+((start_symbol) @function.call
+  .
+  (rust_expr_paren))
+
+((start_symbol) @keyword.directive
+  .
+  (rust_block))
+
+((start_symbol) @keyword.conditional
+  .
+  (if_stmt))
+
+((start_symbol) @keyword
+  .
+  (for_stmt))
+
+((start_symbol) @keyword.repeat
+  .
+  (while_stmt))
+
+((start_symbol) @keyword.conditional
+  .
+  (match_stmt))
+
+;this is for now extra
+(else_clause
+  head: (rust_text) @keyword.conditional)

runtime/queries/rshtml/injections.scm

@@ -0,0 +1,9 @@
+((html_text) @injection.content
+  (#set! injection.language "html")
+  (#set! injection.include-children)
+  (#set! injection.combined))
+
+((rust_text) @injection.content
+  (#set! injection.language "rust")
+  (#set! injection.include-children)
+  (#not-match? @injection.content "^else"))