Allowing extension point for lsp specific actions

Author: nikfp

README.md

@@ -138,6 +138,16 @@ elixir.setup {
     -- not currently supported by elixirls, but can be a table if you wish to pass other args `{"path/to/elixirls", "--foo"}`
     cmd = "/usr/local/bin/elixir-ls.sh",
 
+	-- extension point to link in to server specific commands
+	-- by default, the codelens action below runs a default test runner in a terminal buffer 
+	-- replacing it as shown here will override default behavior, allow running a custom function instead
+	-- `args` are anything the lsp command passes back to the callback function
+	commands = {
+      ["elixir.lens.test.run"] = function(args)
+	    -- custom functionality here as needed
+	  end
+	},
+
     -- default settings, use the `settings` function to override settings
     settings = elixirls.settings {
       dialyzerEnabled = true,

lua/elixir/elixirls/init.lua

@@ -164,7 +164,7 @@ end
 
 function M.command(params)
   local install_path =
-    Path:new(params.path, params.repo, Utils.safe_path(params.ref), params.versions, "language_server.sh")
+      Path:new(params.path, params.repo, Utils.safe_path(params.ref), params.versions, "language_server.sh")
 
   return install_path
 end
@@ -260,7 +260,7 @@ local function repo_opts(opts)
   else
     if opts.repo then -- if we specified a repo in our conifg, then let's default to HEAD
       ref = "HEAD"
-    else -- else, let's checkout the latest stable release
+    else              -- else, let's checkout the latest stable release
       ref = default_install_tag
     end
   end
@@ -318,12 +318,15 @@ function M.setup(opts)
 
     if root_dir then
       local log_message = vim.lsp.handlers["window/logMessage"]
+
+      local commands = vim.tbl_extend('force', {
+        ["elixir.lens.test.run"] = test,
+      }, opts.commands or {})
+
       vim.lsp.start(vim.tbl_extend("keep", {
         name = "ElixirLS",
         cmd = opts.cmd and wrap_in_table(opts.cmd) or { tostring(cmd) },
-        commands = {
-          ["elixir.lens.test.run"] = test,
-        },
+        commands = commands,
         settings = opts.settings or M.settings {},
         capabilities = opts.capabilities or capabilities,
         root_dir = root_dir,
@@ -332,7 +335,7 @@ function M.setup(opts)
             log_message(err, result, ...)
 
             local message =
-              vim.split("[" .. vim.lsp.protocol.MessageType[result.type] .. "] " .. result.message, "\n")
+                vim.split("[" .. vim.lsp.protocol.MessageType[result.type] .. "] " .. result.message, "\n")
 
             pcall(vim.api.nvim_buf_set_lines, elixir_nvim_output_bufnr, -1, -1, false, message)
           end,