initial commit [ci skip]

engine/compiler/os.go

@@ -0,0 +1,85 @@
+// Copyright 2019 Drone.IO Inc. All rights reserved.
+// Use of this source code is governed by the Polyform License
+// that can be found in the LICENSE file.
+
+package compiler
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/drone/runner-go/shell/bash"
+	"github.com/drone/runner-go/shell/powershell"
+)
+
+// helper function returns the base temporary directory based
+// on the target platform.
+func tempdir(os string) string {
+	dir := fmt.Sprintf("drone-%s", random())
+	switch os {
+	case "windows":
+		return join(os, "C:\\Windows\\Temp", dir)
+	default:
+		return join(os, "/tmp", dir)
+	}
+}
+
+// helper function joins the file paths.
+func join(os string, paths ...string) string {
+	switch os {
+	case "windows":
+		return strings.Join(paths, "\\")
+	default:
+		return strings.Join(paths, "/")
+	}
+}
+
+// helper function returns the shell extension based on the
+// target platform.
+func getExt(os, file string) (s string) {
+	switch os {
+	case "windows":
+		return file + ".ps1"
+	default:
+		return file
+	}
+}
+
+//
+// TODO(bradrydzewski) can we remove the below functions?
+//
+
+// helper function returns the shell command and arguments
+// based on the target platform to invoke the script
+func getCommand(os, script string) (string, []string) {
+	cmd, args := bash.Command()
+	switch os {
+	case "windows":
+		cmd, args = powershell.Command()
+	}
+	return cmd, append(args, script)
+}
+
+// helper function returns the netrc file name based on the
+// target platform.
+func getNetrc(os string) string {
+	switch os {
+	case "windows":
+		return "_netrc"
+	default:
+		return ".netrc"
+	}
+}
+
+// helper function generates and returns a shell script to
+// execute the provided shell commands. The shell scripting
+// language (bash vs pwoershell) is determined by the operating
+// system.
+func genScript(os string, commands []string) string {
+	switch os {
+	case "windows":
+		return powershell.Script(commands)
+	default:
+		return bash.Script(commands)
+	}
+}