Added lib deps command

Author: cmaglie

Diff for: cli/lib/check_deps.go

@@ -0,0 +1,104 @@
+/*
+ * This file is part of arduino-cli.
+ *
+ * Copyright 2018 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 [email protected].
+ */
+
+package lib
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/arduino/arduino-cli/cli/errorcodes"
+	"github.com/arduino/arduino-cli/cli/feedback"
+	"github.com/arduino/arduino-cli/cli/globals"
+	"github.com/arduino/arduino-cli/cli/instance"
+	"github.com/arduino/arduino-cli/commands/lib"
+	rpc "github.com/arduino/arduino-cli/rpc/commands"
+	"github.com/fatih/color"
+	"github.com/spf13/cobra"
+)
+
+func initDepsCommand() *cobra.Command {
+	depsCommand := &cobra.Command{
+		Use:   "deps LIBRARY[@VERSION_NUMBER](S)",
+		Short: "Check dependencies status for the specified library.",
+		Long:  "Check dependencies status for the specified library.",
+		Example: "" +
+			"  " + os.Args[0] + " lib deps AudioZero       # for the latest version.\n" +
+			"  " + os.Args[0] + " lib deps [email protected] # for the specific version.",
+		Args: cobra.ExactArgs(1),
+		Run:  runDepsCommand,
+	}
+	return depsCommand
+}
+
+func runDepsCommand(cmd *cobra.Command, args []string) {
+	libRef, err := globals.ParseLibraryReferenceArg(args[0])
+	if err != nil {
+		feedback.Errorf("Arguments error: %v", err)
+		os.Exit(errorcodes.ErrBadArgument)
+	}
+
+	instance := instance.CreateInstaceIgnorePlatformIndexErrors()
+	deps, err := lib.LibraryResolveDependencies(context.Background(), &rpc.LibraryResolveDependenciesReq{
+		Instance: instance,
+		Name:     libRef.Name,
+		Version:  libRef.Version,
+	})
+	if err != nil {
+		feedback.Errorf("Error resolving dependencies for %s: %s", libRef, err)
+	}
+
+	feedback.PrintResult(&checkDepResult{deps: deps})
+}
+
+// output from this command requires special formatting, let's create a dedicated
+// feedback.Result implementation
+type checkDepResult struct {
+	deps *rpc.LibraryResolveDependenciesResp
+}
+
+func (dr checkDepResult) Data() interface{} {
+	return dr.deps
+}
+
+func (dr checkDepResult) String() string {
+	res := ""
+	for _, dep := range dr.deps.GetDependencies() {
+		res += outputDep(dep)
+	}
+	return res
+}
+
+func outputDep(dep *rpc.LibraryDependencyStatus) string {
+	res := ""
+	green := color.New(color.FgGreen)
+	red := color.New(color.FgRed)
+	yellow := color.New(color.FgYellow)
+	if dep.GetVersionInstalled() == "" {
+		res += fmt.Sprintf("%s must be installed.\n",
+			red.Sprintf("✕ %s %s", dep.GetName(), dep.GetVersionRequired()))
+	} else if dep.GetVersionInstalled() == dep.GetVersionRequired() {
+		res += fmt.Sprintf("%s is already installed.\n",
+			green.Sprintf("✓ %s %s", dep.GetName(), dep.GetVersionRequired()))
+	} else {
+		res += fmt.Sprintf("%s is required but %s is currently installed.\n",
+			yellow.Sprintf("✕ %s %s", dep.GetName(), dep.GetVersionRequired()),
+			yellow.Sprintf("%s", dep.GetVersionInstalled()))
+	}
+	return res
+}

Diff for: cli/lib/lib.go

@@ -41,6 +41,6 @@ func NewCommand() *cobra.Command {
 	libCommand.AddCommand(initUninstallCommand())
 	libCommand.AddCommand(initUpgradeCommand())
 	libCommand.AddCommand(initUpdateIndexCommand())
-
+	libCommand.AddCommand(initDepsCommand())
 	return libCommand
 }