Add nix language syntax (#2024)

* Create nix.yaml

Add nix language syntax

* Add nix-linter

runtime/plugins/linter/linter.lua

@@ -86,6 +86,7 @@ function preinit()
     makeLinter("swiftc", "swift", "xcrun", {"swiftc", "%f"}, "%f:%l:%c:.+: %m", {"darwin"}, true)
     makeLinter("swiftc", "swift", "swiftc", {"%f"}, "%f:%l:%c:.+: %m", {"linux"}, true)
     makeLinter("yaml", "yaml", "yamllint", {"--format", "parsable", "%f"}, "%f:%l:%c:.+ %m")
+    makeLinter("nix-linter", "nix", "nix-linter", {"%f"}, "%m at %f:%l:%c", {"linux"}, true)
 
     config.MakeCommand("lint", function(bp, args)
         bp:Save()

runtime/syntax/nix.yaml

@@ -0,0 +1,27 @@
+filetype: nix
+
+detect:
+    filename: "\\.nix$"
+
+rules:
+    - special: "\\b(Ellipsis|null|self|super|true|false|abort)\\b"
+    - statement: "\\b(let|in|with|import|rec|inherit)\\b"
+    - symbol.operator: "([~^.:;,+*|=!\\%@]|<|>|/|-|&)"
+    - symbol.brackets: "([(){}]|\\[|\\])"
+
+    - constant.number: "\\b[0-9](_?[0-9])*(\\.([0-9](_?[0-9])*)?)?(e[0-9](_?[0-9])*)?\\b"
+
+    - constant.string:
+        start: "\""
+        end: "\""
+        rules: []
+
+    - constant.string:
+        start: "''"
+        end: "''"
+        rules: []
+
+    - comment:
+        start: "#"
+        end: "$"
+        rules: []