Get basic syntax highlighting working

This pulls the queries and injections straight from the work done for
Helix in [this PR][1], from @zetashift. These should definitely be
upstreamed when possible! They also show up a few bugs in the grammar
as it stands, e.g. keywords get highlighted in the middle of
documentation blocks, where they should be ignored. Still: a start!

[1]: helix-editor/helix#7724

Queries/highlights.scm

@@ -1 +1,71 @@
-(kw_forall) @keyword
+;; Primitives
+(comment) @comment
+(nat) @constant.numeric
+(unit) @constant.builtin
+(literal_char) @constant.character
+(literal_text) @string
+(literal_boolean) @constant.builtin.boolean
+
+;; Keywords
+[
+  (kw_forall)
+  (unique_kw)
+  (type_kw)
+  (kw_equals)
+  (do)
+] @keyword
+
+(kw_let) @keyword.function
+(type_kw) @keyword.storage.type
+(unique) @keyword.storage.modifier
+("use") @keyword.control.import
+
+
+[
+  (type_constructor)
+] @constructor
+
+[
+  (operator)
+  (pipe)
+  (arrow_symbol)
+  (">")
+  (or)
+  (bang)
+] @operator
+
+[
+  "if"
+  "else"
+  "then"
+  (match)
+  (with)
+  (cases)
+] @keyword.control.conditional
+
+(blank_pattern) @variable.builtin
+
+;; Types
+(record_field name: (wordy_id) @variable.other.member type: (wordy_id) @type)
+[
+  (type_name)
+  (type_signature)
+  (effect)
+] @type
+
+(term_definition) @variable
+
+;; Punctuation
+[
+  (type_signature_colon)
+  ":"
+] @punctuation.delimiter
+
+[
+  "("
+  ")"
+  "{"
+  "}"
+  "["
+  "]"
+] @punctuation.bracket

Queries/injections.scm

@@ -0,0 +1 @@
+((doc_block) @injection.content (#set! injection.language "markdown"))

Syntaxes/unison.xml

@@ -38,5 +38,6 @@
         <highlights path="highlights.scm" />
         <folds path="folds.scm" />
         <symbols path="symbols.scm" />
+        <injections />
     </tree-sitter>
 </syntax>