feat: add erg-language-server support (#2165)

* feat: add erg-language-server support

* fix(erg-language-server): update root directory pattern

* fix(erg-language-server): fixed typo in description

1 files changed, 26 insertions, 0 deletions

diff --git a/lua/lspconfig/server_configurations/erg_language_server.lua b/lua/lspconfig/server_configurations/erg_language_server.lua
new file mode 100644
index 00000000..7f2daf70
--- /dev/null
+++ b/lua/lspconfig/server_configurations/erg_language_server.lua
@@ -0,0 +1,26 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'els' },
+    filetypes = { 'erg' },
+    root_dir = function(fname)
+      return util.root_pattern 'package.er'(fname) or util.find_git_ancestor(fname)
+    end,
+  },
+  docs = {
+    description = [[
+https://github.com/erg-lang/erg-language-server
+
+ELS (erg-language-server) is a language server for the Erg programming language.
+
+`els` can be installed via `cargo`:
+ ```sh
+ cargo install els
+ ```
+    ]],
+    default_config = {
+      root_dir = [[root_pattern("package.er") or find_git_ancestor]],
+    },
+  },
+}