Add Scheme support

Skipped scm for now :/ it overlaps with tree-sitter-tsq

languages.toml

@@ -1366,3 +1366,16 @@ roots = []
 [[grammar]]
 name = "sshclientconfig"
 source = { git = "https://github.com/metio/tree-sitter-ssh-client-config", rev = "769d7a01a2e5493b4bb5a51096c6bf4be130b024" }
+
+[[language]]
+name = "scheme"
+scope = "source.scheme"
+injection-regex = "scheme"
+file-types = ["ss", "rkt"] # "scm",
+roots = []
+comment-token = ";"
+indent = { tab-width = 2, unit = "  " }
+
+[[grammar]]
+name = "scheme"
+source = { git = "https://github.com/6cdh/tree-sitter-scheme", rev = "27fb77db05f890c2823b4bd751c6420378df146b" }

runtime/queries/scheme/highlights.scm

@@ -0,0 +1,100 @@
+(number) @constant.numeric
+(character) @constant.character
+(boolean) @constant.builtin.boolean
+
+[(string)
+ (character)] @string
+
+(escape_sequence) @constant.character.escape
+
+[(comment)
+ (block_comment)
+ (directive)] @comment
+
+[(boolean)
+ (character)] @constant
+
+((symbol) @function.builtin
+ (#match? @function.builtin "^(eqv\\?|eq\\?|equal\\?)")) ; TODO
+
+; keywords
+
+((symbol) @keyword.conditional
+ (#match? @keyword.conditional "^(if|cond|case|when|unless)$"))
+
+((symbol) @keyword
+ (#match? @keyword
+  "^(define|lambda|begin|do|define-syntax|and|or|if|cond|case|when|unless|else|=>|let|let*|let-syntax|let-values|let*-values|letrec|letrec*|letrec-syntax|set!|syntax-rules|identifier-syntax|quote|unquote|quote-splicing|quasiquote|unquote-splicing|delay|assert|library|export|import|rename|only|except|prefix)$"))
+
+; special forms
+
+(list
+ "["
+ (symbol)+ @variable
+ "]")
+
+(list
+ .
+ (symbol) @_f
+ .
+ (list
+   (symbol) @variable)
+ (#eq? @_f "lambda"))
+
+(list
+ .
+ (symbol) @_f
+ .
+ (list
+   (list
+     (symbol) @variable))
+ (#match? @_f
+  "^(let|let\\*|let-syntax|let-values|let\\*-values|letrec|letrec\\*|letrec-syntax)$"))
+
+; operators
+
+(list
+  .
+  (symbol) @operator
+  (#match? @operator "^([+*/<>=-]|(<=)|(>=))$"))
+
+; quote
+
+(abbreviation
+  "'" (symbol)) @constant
+
+(list
+ .
+ (symbol) @_f
+ (#eq? @_f "quote")) @symbol
+
+; library
+
+(list
+ .
+ (symbol) @_lib
+ .
+ (symbol) @namespace
+
+ (#eq? @_lib "library"))
+
+; procedure
+
+(list
+  .
+  (symbol) @function)
+
+;; variables
+
+((symbol) @variable.builtin
+ (#eq? @variable.builtin "..."))
+
+(symbol) @variable
+((symbol) @variable.builtin
+ (#eq? @variable.builtin "."))
+
+(symbol) @variable
+
+
+["(" ")" "[" "]" "{" "}"] @punctuation.bracket
+

runtime/queries/scheme/injections.scm

@@ -0,0 +1,5 @@
+((comment) @injection.content
+ (#set! injection.language "comment"))
+
+((block_comment) @injection.content
+ (#set! injection.language "comment"))