nvimtest: add nvimtest package

Signed-off-by: Koichi Shiraishi <[email protected]>

Author: zchee

nvim/nvimtest/nvimtest.go

@@ -0,0 +1,53 @@
+package nvimtest
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"testing"
+
+	"github.com/neovim/go-client/nvim"
+)
+
+// NewChildProcess returns the new *Nvim, and registers cleanup to tb.Cleanup.
+func NewChildProcess(tb testing.TB) *nvim.Nvim {
+	tb.Helper()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	tb.Cleanup(func() {
+		cancel()
+	})
+
+	tmpdir := tb.TempDir()
+	envs := os.Environ()
+	envs = append(envs, []string{
+		fmt.Sprintf("XDG_CONFIG_HOME=%s", tmpdir),
+		fmt.Sprintf("XDG_DATA_HOME=%s", tmpdir),
+		fmt.Sprintf("NVIM_LOG_FILE=%s", os.DevNull),
+	}...)
+	opts := []nvim.ChildProcessOption{
+		nvim.ChildProcessCommand(nvim.BinaryName),
+		nvim.ChildProcessArgs(
+			"--clean",             // Mimics a fresh install of Nvim. See :help --clean
+			"--embed",             // Use stdin/stdout as a msgpack-RPC channel, so applications can embed and control Nvim via the RPC API.
+			"--headless",          // Start without UI, and do not wait for nvim_ui_attach
+			"-c", "set packpath=", // Clean packpath
+		),
+		nvim.ChildProcessContext(ctx),
+		nvim.ChildProcessEnv(envs),
+		nvim.ChildProcessServe(true),
+		nvim.ChildProcessLogf(tb.Logf),
+	}
+	n, err := nvim.NewChildProcess(opts...)
+	if err != nil {
+		tb.Fatal(err)
+	}
+
+	tb.Cleanup(func() {
+		if err := n.Close(); err != nil {
+			tb.Fatal(err)
+		}
+	})
+
+	return n
+}