Add markdown grammar

Fixes #215

.gitmodules

@@ -150,3 +150,7 @@
 	path = helix-syntax/languages/tree-sitter-llvm
 	url = https://github.com/benwilliamgraham/tree-sitter-llvm
 	shallow = true
+[submodule "helix-syntax/languages/tree-sitter-markdown"]
+	path = helix-syntax/languages/tree-sitter-markdown
+	url = https://github.com/MDeiml/tree-sitter-markdown
+	shallow = true

helix-syntax/languages/tree-sitter-markdown

@@ -0,0 +1 @@
+Subproject commit ad8c32917a16dfbb387d1da567bf0c3fb6fffde2

languages.toml

@@ -421,3 +421,12 @@ roots = []
 file-types = ["ll"]
 comment-token = ";"
 indent = { tab-width = 2, unit = "  " }
+
+[[language]]
+name = "markdown"
+scope = "source.md"
+injection-regex = "md|markdown"
+file-types = ["md"]
+roots = []
+
+indent = { tab-width = 2, unit = "  " }

runtime/queries/markdown/highlights.scm

@@ -0,0 +1,35 @@
+[
+  (atx_heading)
+  (setext_heading)
+] @markup.heading
+
+(code_fence_content) @none
+
+[
+  (indented_code_block)
+  (fenced_code_block)
+] @markup.raw.block
+
+(code_span) @markup.raw.inline
+
+(emphasis) @markup.italic
+
+(strong_emphasis) @markup.bold
+
+(link_destination) @markup.underline.link
+
+; (link_label) @markup.label ; TODO: rename
+
+[
+  (list_marker_plus)
+  (list_marker_minus)
+  (list_marker_star)
+  (list_marker_dot)
+  (list_marker_parenthesis)
+] @punctuation.special
+
+[
+  (backslash_escape)
+  (hard_line_break)
+] @string.character.escape
+

runtime/queries/svelte/highlights.scm

@@ -25,7 +25,7 @@
 
 ((attribute
    (attribute_name) @_attr
-   (quoted_attribute_value (attribute_value) @markup.undeline.link))
+   (quoted_attribute_value (attribute_value) @markup.underline.link))
  (#match? @_attr "^(href|src)$"))
 
 (tag_name) @tag

theme.toml

@@ -28,6 +28,12 @@ string = "silver"
 # used for lifetimes
 label = "honey"
 
+"markup.heading" = "lilac"
+"markup.bold" = { modifiers = ["bold"] }
+"markup.italic" = { modifiers = ["italic"] }
+"markup.underline.link" = { fg = "silver", modifiers = ["underlined"] }
+"markup.raw" = "almond"
+
 # TODO: diferentiate doc comment
 # concat (ERROR) @error.syntax and "MISSING ;" selectors for errors