cuepls: initial version of cmd/cuepls

As mentioned in previous CL commit messages, we are maintaining
cmd/cuepls as a separate entry point for now largely because of the
complications in adapting the flag handling between the flag-based
approach of gopls (cuepls) and the cobra-based approach of cmd/cue. We
will fix/unify those approaches in a later CL, but for now we are in the
mindset of making minimal changes to get a working cuepls.

This commit creates the cmd/cuepls entrypoint. An integration test
follows in a later CL.

For #142

Signed-off-by: Paul Jolly <paul@myitcv.io>
Change-Id: I533b875155f4d2da999ff1c1ef20d32eea3c4ff4

cmd/cuepls/main.go

@@ -0,0 +1,24 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// cuepls (pronounced “CUE please”) is an LSP server for CUE.
+// The Language Server Protocol allows any text editor to be extended with
+// IDE-like features; see https://langserver.org/ for details.
+package main
+
+import (
+	"context"
+	"os"
+
+	"cuelang.org/go/internal/golangorgx/gopls/cmd"
+	"cuelang.org/go/internal/golangorgx/gopls/hooks"
+	"cuelang.org/go/internal/golangorgx/telemetry/counter"
+	"cuelang.org/go/internal/golangorgx/tools/tool"
+)
+
+func main() {
+	counter.Open() // Enable telemetry counter writing.
+	ctx := context.Background()
+	tool.Main(ctx, cmd.New(hooks.Options), os.Args[1:])
+}