Add dtsfmt

Author: mskelton

lua/null-ls/builtins/formatting/dtsfmt.lua

@@ -0,0 +1,21 @@
+local h = require("null-ls.helpers")
+local methods = require("null-ls.methods")
+
+local FORMATTING = methods.internal.FORMATTING
+
+return h.make_builtin({
+    name = "dtsfmt",
+    meta = {
+        url = "https://github.com/dts-lang/rustfmt",
+        description = "Auto formatter for device tree source files",
+        notes = { "Requires that `dtsfmt` is executable and on $PATH." },
+    },
+    method = FORMATTING,
+    filetypes = { "dts" },
+    generator_opts = {
+        command = "dtsfmt",
+        args = { "--emit=stdout" },
+        to_stdin = true,
+    },
+    factory = h.formatter_factory,
+})