Add support for the Haxe Language Server

This adds support for the language server used by the Visual Studio Code
Haxe Extension: https://github.com/vshaxe/haxe-language-server

I've found this language server to be tricky to properly attach to, but
this config should do the trick.

1 files changed, 48 insertions, 0 deletions

diff --git a/lua/lspconfig/haxe_language_server.lua b/lua/lspconfig/haxe_language_server.lua
new file mode 100644
index 00000000..8660ea1e
--- /dev/null
+++ b/lua/lspconfig/haxe_language_server.lua
@@ -0,0 +1,48 @@
+local configs = require 'lspconfig/configs'
+local util = require 'lspconfig/util'
+
+configs.haxe_language_server = {
+  default_config = {
+    cmd = {"haxe-language-server"};
+    filetypes = {"haxe"};
+    root_dir = util.root_pattern("*.hxml");
+    settings = {
+      haxe = {
+        executable = "haxe";
+      };
+    };
+    init_options = {
+      displayArguments = {"build.hxml"};
+    };
+  };
+  docs = {
+    description = [[
+https://github.com/vshaxe/haxe-language-server
+
+The Haxe language server can be built by running the following commands from
+the project's root directory:
+
+    npm install
+    npx lix run vshaxe-build -t language-server
+
+This will create `bin/server.js`. Note that the server requires Haxe 3.4.0 or
+higher.
+
+After building the language server, set the `cmd` setting in your setup
+function:
+
+```lua
+lspconfig.haxe_language_server.setup({
+  cmd = {"node", "path/to/bin/server.js"},
+})
+```
+
+By default, an HXML compiler arguments file named `build.hxml` is expected in
+your project's root directory. If your file is named something different,
+specify it using the `init_options.displayArguments` setting.
+]],
+    default_config = {
+      root_dir = [[root_pattern("*.hxml")]];
+    };
+  }
+}