feat: Add cache clean

Add command `cache clean` to clean the cache files
depending on the loaction of the caching files
under different OS.

Author: howjmay

cli/cache/cache.go

@@ -0,0 +1,37 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
+
+package cache
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// NewCommand created a new `cache` command
+func NewCommand() *cobra.Command {
+	cacheCommand := &cobra.Command{
+		Use:   "cache",
+		Short: "Arduino cache commands.",
+		Long:  "Arduino cache commands.",
+		Example: "# Clean caches.\n" +
+			" " + os.Args[0] + " cache clean\n\n",
+	}
+
+	cacheCommand.AddCommand(initCleanCommand())
+
+	return cacheCommand
+}

cli/cache/clean.go

@@ -0,0 +1,75 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
+
+package cache
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+
+	"github.com/arduino/arduino-cli/cli/errorcodes"
+	"github.com/arduino/arduino-cli/cli/feedback"
+	"github.com/arduino/go-win32-utils"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+func initCleanCommand() *cobra.Command {
+	cleanCommand := &cobra.Command{
+		Use:     "clean",
+		Short:   "Clean arduino cache.",
+		Long:    "Clean the files i.e. `~/arduino15/staging` in Linux.",
+		Example: "  " + os.Args[0] + " cache clean",
+		Args:    cobra.NoArgs,
+		Run:     runCleanCommand,
+	}
+	return cleanCommand
+}
+
+func runCleanCommand(cmd *cobra.Command, args []string) {
+	logrus.Info("Executing `arduino cache clean`")
+
+	cachePath := getDefaultArduinoDataDir() + "/staging"
+	err := os.RemoveAll(cachePath)
+	if err != nil {
+		feedback.Errorf("Error cleaning caches: %v", err)
+		os.Exit(errorcodes.ErrGeneric)
+	}
+}
+
+func getDefaultArduinoDataDir() string {
+	userHomeDir, err := os.UserHomeDir()
+	if err != nil {
+		feedback.Errorf("Unable to get user home dir: %v", err)
+		return "."
+	}
+
+	switch runtime.GOOS {
+	case "linux":
+		return filepath.Join(userHomeDir, ".arduino15")
+	case "darwin":
+		return filepath.Join(userHomeDir, "Library", "Arduino15")
+	case "windows":
+		localAppDataPath, err := win32.GetLocalAppDataFolder()
+		if err != nil {
+			feedback.Errorf("Unable to get Local App Data Folder: %v", err)
+			return "."
+		}
+		return filepath.Join(localAppDataPath, "Arduino15")
+	default:
+		return "."
+	}
+}

cli/cli.go

@@ -23,6 +23,7 @@ import (
 	"strings"
 
 	"github.com/arduino/arduino-cli/cli/board"
+	"github.com/arduino/arduino-cli/cli/cache"
 	"github.com/arduino/arduino-cli/cli/compile"
 	"github.com/arduino/arduino-cli/cli/config"
 	"github.com/arduino/arduino-cli/cli/core"
@@ -67,6 +68,7 @@ func init() {
 // this is here only for testing
 func createCliCommandTree(cmd *cobra.Command) {
 	cmd.AddCommand(board.NewCommand())
+	cmd.AddCommand(cache.NewCommand())
 	cmd.AddCommand(compile.NewCommand())
 	cmd.AddCommand(config.NewCommand())
 	cmd.AddCommand(core.NewCommand())