feat: add support for caramel fmt (nvim-lua#469)

Author: hougesen

README.md

@@ -200,6 +200,7 @@ You can view this list in vim with `:help conform-formatters`
 - [buf](https://buf.build/docs/reference/cli/buf/format) - A new way of working with Protocol Buffers.
 - [buildifier](https://github.com/bazelbuild/buildtools/tree/master/buildifier) - buildifier is a tool for formatting bazel BUILD and .bzl files with a standard convention.
 - [cabal_fmt](https://hackage.haskell.org/package/cabal-fmt) - Format cabal files with cabal-fmt
+- [caramel_fmt](https://caramel.run/manual/reference/cli/fmt.html) - Format Caramel code.
 - [cbfmt](https://github.com/lukas-reineke/cbfmt) - A tool to format codeblocks inside markdown and org documents.
 - [clang-format](https://www.kernel.org/doc/html/latest/process/clang-format.html) - Tool to format C/C++/… code according to a set of rules and heuristics.
 - [cljstyle](https://github.com/greglook/cljstyle) - Formatter for Clojure code.

doc/conform.txt

@@ -239,6 +239,7 @@ FORMATTERS                                                    *conform-formatter
 `buildifier` - buildifier is a tool for formatting bazel BUILD and .bzl files
              with a standard convention.
 `cabal_fmt` - Format cabal files with cabal-fmt
+`caramel_fmt` - Format Caramel code.
 `cbfmt` - A tool to format codeblocks inside markdown and org documents.
 `clang-format` - Tool to format C/C++/… code according to a set of rules and
                heuristics.

lua/conform/formatters/caramel_fmt.lua

@@ -0,0 +1,10 @@
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://caramel.run/manual/reference/cli/fmt.html",
+    description = "Format Caramel code.",
+  },
+  command = "caramel",
+  args = { "fmt", "$FILENAME" },
+  stdin = false,
+}