Added 'lib examples' command (#905)

* Added 'examples' field in rpc.Library

* Added lib examples command

* Fixed case in json output

* Fixed coloring

* Allow library listing filter by name

* Added function to compute library location priority

* Sort examples results by name

* Added fqbn filtering for libraries

* Sort lib list output by name

arduino/libraries/libraries.go

@@ -70,6 +70,7 @@ type Library struct {
 	Version                *semver.Version
 	License                string
 	Properties             *properties.Map
+	Examples               paths.PathList
 }
 
 func (library *Library) String() string {
@@ -137,3 +138,18 @@ func (library *Library) SourceDirs() []SourceDir {
 	}
 	return dirs
 }
+
+// LocationPriorityFor returns a number representing the location priority for the given library
+// using the given platform and referenced-platform. Higher value means higher priority.
+func (library *Library) LocationPriorityFor(platformRelease, refPlatformRelease *cores.PlatformRelease) int {
+	if library.Location == IDEBuiltIn {
+		return 1
+	} else if library.ContainerPlatform == refPlatformRelease {
+		return 2
+	} else if library.ContainerPlatform == platformRelease {
+		return 3
+	} else if library.Location == User {
+		return 4
+	}
+	return 0
+}

arduino/libraries/libraries_location.go

@@ -28,7 +28,7 @@ type LibraryLocation int
 // The enumeration is listed in ascending order of priority
 const (
 	// IDEBuiltIn are libraries bundled in the IDE
-	IDEBuiltIn = iota
+	IDEBuiltIn LibraryLocation = iota
 	// PlatformBuiltIn are libraries bundled in a PlatformRelease
 	PlatformBuiltIn
 	// ReferencedPlatformBuiltIn are libraries bundled in a PlatformRelease referenced for build

arduino/libraries/loader.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/arduino/go-paths-helper"
 	properties "github.com/arduino/go-properties-orderedmap"
+	"github.com/pkg/errors"
 	semver "go.bug.st/relaxed-semver"
 )
 
@@ -94,6 +95,9 @@ func makeNewLibrary(libraryDir *paths.Path, location LibraryLocation) (*Library,
 		library.Version = v
 	}
 
+	if err := addExamples(library); err != nil {
+		return nil, errors.Errorf("scanning examples: %s", err)
+	}
 	library.Name = libraryDir.Base()
 	library.RealName = strings.TrimSpace(libProperties.Get("name"))
 	library.Author = strings.TrimSpace(libProperties.Get("author"))
@@ -122,6 +126,56 @@ func makeLegacyLibrary(path *paths.Path, location LibraryLocation) (*Library, er
 		IsLegacy:      true,
 		Version:       semver.MustParse(""),
 	}
+	if err := addExamples(library); err != nil {
+		return nil, errors.Errorf("scanning examples: %s", err)
+	}
 	addUtilityDirectory(library)
 	return library, nil
 }
+
+func addExamples(lib *Library) error {
+	files, err := lib.InstallDir.ReadDir()
+	if err != nil {
+		return err
+	}
+	examples := paths.NewPathList()
+	for _, file := range files {
+		name := strings.ToLower(file.Base())
+		if name != "example" && name != "examples" {
+			continue
+		}
+		if !file.IsDir() {
+			continue
+		}
+		if err := addExamplesToPathList(file, &examples); err != nil {
+			return err
+		}
+		break
+	}
+
+	lib.Examples = examples
+	return nil
+}
+
+func addExamplesToPathList(examplesPath *paths.Path, list *paths.PathList) error {
+	files, err := examplesPath.ReadDir()
+	if err != nil {
+		return err
+	}
+	for _, file := range files {
+		if isExample(file) {
+			list.Add(file)
+		} else if file.IsDir() {
+			if err := addExamplesToPathList(file, list); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// isExample returns true if examplePath contains an example
+func isExample(examplePath *paths.Path) bool {
+	mainIno := examplePath.Join(examplePath.Base() + ".ino")
+	return mainIno.Exist() && mainIno.IsNotDir()
+}

cli/lib/examples.go

+// 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 lib
+
+import (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+
+	"github.com/arduino/arduino-cli/cli/errorcodes"
+	"github.com/arduino/arduino-cli/cli/feedback"
+	"github.com/arduino/arduino-cli/cli/instance"
+	"github.com/arduino/arduino-cli/commands/lib"
+	rpc "github.com/arduino/arduino-cli/rpc/commands"
+	"github.com/arduino/go-paths-helper"
+	"github.com/fatih/color"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
+)
+
+func initExamplesCommand() *cobra.Command {
+	examplesCommand := &cobra.Command{
+		Use:     "examples [LIBRARY_NAME]",
+		Short:   "Shows the list of the examples for libraries.",
+		Long:    "Shows the list of the examples for libraries. A name may be given as argument to search a specific library.",
+		Example: "  " + os.Args[0] + " lib examples Wire",
+		Args:    cobra.MaximumNArgs(1),
+		Run:     runExamplesCommand,
+	}
+	examplesCommand.Flags().StringVarP(&examplesFlags.fqbn, "fqbn", "b", "", "Show libraries for the specified board FQBN.")
+	return examplesCommand
+}
+
+var examplesFlags struct {
+	fqbn string
+}
+
+func runExamplesCommand(cmd *cobra.Command, args []string) {
+	instance := instance.CreateInstanceIgnorePlatformIndexErrors()
+	logrus.Info("Show examples for library")
+
+	name := ""
+	if len(args) > 0 {
+		name = args[0]
+	}
+
+	res, err := lib.LibraryList(context.Background(), &rpc.LibraryListReq{
+		Instance: instance,
+		All:      true,
+		Name:     name,
+		Fqbn:     examplesFlags.fqbn,
+	})
+	if err != nil {
+		feedback.Errorf("Error getting libraries info: %v", err)
+		os.Exit(errorcodes.ErrGeneric)
+	}
+
+	found := []*libraryExamples{}
+	for _, lib := range res.GetInstalledLibrary() {
+		found = append(found, &libraryExamples{
+			Library:  lib.Library,
+			Examples: lib.Library.Examples,
+		})
+	}
+
+	feedback.PrintResult(libraryExamplesResult{found})
+	logrus.Info("Done")
+}
+
+// output from this command requires special formatting, let's create a dedicated
+// feedback.Result implementation
+
+type libraryExamples struct {
+	Library  *rpc.Library `json:"library"`
+	Examples []string     `json:"examples"`
+}
+
+type libraryExamplesResult struct {
+	Examples []*libraryExamples
+}
+
+func (ir libraryExamplesResult) Data() interface{} {
+	return ir.Examples
+}
+
+func (ir libraryExamplesResult) String() string {
+	if ir.Examples == nil || len(ir.Examples) == 0 {
+		return "No libraries found."
+	}
+
+	sort.Slice(ir.Examples, func(i, j int) bool {
+		return strings.ToLower(ir.Examples[i].Library.Name) < strings.ToLower(ir.Examples[j].Library.Name)
+	})
+
+	res := []string{}
+	for _, lib := range ir.Examples {
+		name := lib.Library.Name
+		if lib.Library.ContainerPlatform != "" {
+			name += " (" + lib.Library.GetContainerPlatform() + ")"
+		} else if lib.Library.Location != rpc.LibraryLocation_user {
+			name += " (" + lib.Library.GetLocation().String() + ")"
+		}
+		r := fmt.Sprintf("Examples for library %s\n", color.GreenString("%s", name))
+		sort.Slice(lib.Examples, func(i, j int) bool {
+			return strings.ToLower(lib.Examples[i]) < strings.ToLower(lib.Examples[j])
+		})
+		for _, example := range lib.Examples {
+			examplePath := paths.New(example)
+			r += fmt.Sprintf("  - %s%s\n",
+				color.New(color.Faint).Sprintf("%s%c", examplePath.Parent(), os.PathSeparator),
+				examplePath.Base())
+		}
+		res = append(res, r)
+	}
+
+	return strings.Join(res, "\n")
+}

cli/lib/lib.go

@@ -35,6 +35,7 @@ func NewCommand() *cobra.Command {
 	libCommand.AddCommand(initDownloadCommand())
 	libCommand.AddCommand(initInstallCommand())
 	libCommand.AddCommand(initListCommand())
+	libCommand.AddCommand(initExamplesCommand())
 	libCommand.AddCommand(initSearchCommand())
 	libCommand.AddCommand(initUninstallCommand())
 	libCommand.AddCommand(initUpgradeCommand())

cli/lib/list.go

@@ -17,6 +17,8 @@ package lib
 
 import (
 	"os"
+	"sort"
+	"strings"
 
 	"github.com/arduino/arduino-cli/cli/errorcodes"
 	"github.com/arduino/arduino-cli/cli/feedback"
@@ -31,14 +33,18 @@ import (
 
 func initListCommand() *cobra.Command {
 	listCommand := &cobra.Command{
-		Use:     "list",
-		Short:   "Shows a list of all installed libraries.",
-		Long:    "Shows a list of all installed libraries.",
+		Use:   "list [LIBNAME]",
+		Short: "Shows a list of installed libraries.",
+		Long: "Shows a list of installed libraries.\n\n" +
+			"If the LIBNAME parameter is specified the listing is limited to that specific\n" +
+			"library. By default the libraries provided as built-in by platforms/core are\n" +
+			"not listed, they can be listed by adding the --all flag.",
 		Example: "  " + os.Args[0] + " lib list",
-		Args:    cobra.NoArgs,
+		Args:    cobra.MaximumNArgs(1),
 		Run:     runListCommand,
 	}
 	listCommand.Flags().BoolVar(&listFlags.all, "all", false, "Include built-in libraries (from platforms and IDE) in listing.")
+	listCommand.Flags().StringVarP(&listFlags.fqbn, "fqbn", "b", "", "Show libraries for the specified board FQBN.")
 	listCommand.Flags().BoolVar(&listFlags.updatable, "updatable", false, "List updatable libraries.")
 	return listCommand
 }
@@ -46,16 +52,24 @@ func initListCommand() *cobra.Command {
 var listFlags struct {
 	all       bool
 	updatable bool
+	fqbn      string
 }
 
 func runListCommand(cmd *cobra.Command, args []string) {
 	instance := instance.CreateInstanceIgnorePlatformIndexErrors()
 	logrus.Info("Listing")
 
+	name := ""
+	if len(args) > 0 {
+		name = args[0]
+	}
+
 	res, err := lib.LibraryList(context.Background(), &rpc.LibraryListReq{
 		Instance:  instance,
 		All:       listFlags.all,
 		Updatable: listFlags.updatable,
+		Name:      name,
+		Fqbn:      listFlags.fqbn,
 	})
 	if err != nil {
 		feedback.Errorf("Error listing Libraries: %v", err)
@@ -88,6 +102,10 @@ func (ir installedResult) String() string {
 	if ir.installedLibs == nil || len(ir.installedLibs) == 0 {
 		return "No libraries installed."
 	}
+	sort.Slice(ir.installedLibs, func(i, j int) bool {
+		return strings.ToLower(ir.installedLibs[i].Library.Name) < strings.ToLower(ir.installedLibs[j].Library.Name) ||
+			strings.ToLower(ir.installedLibs[i].Library.ContainerPlatform) < strings.ToLower(ir.installedLibs[j].Library.ContainerPlatform)
+	})
 
 	t := table.New()
 	t.SetHeader("Name", "Installed", "Available", "Location", "Description")

commands/lib/list.go

@@ -17,7 +17,11 @@ package lib
 
 import (
 	"context"
+	"errors"
+	"fmt"
+	"strings"
 
+	"github.com/arduino/arduino-cli/arduino/cores"
 	"github.com/arduino/arduino-cli/arduino/libraries"
 	"github.com/arduino/arduino-cli/arduino/libraries/librariesindex"
 	"github.com/arduino/arduino-cli/arduino/libraries/librariesmanager"
@@ -32,12 +36,57 @@ type installedLib struct {
 
 // LibraryList FIXMEDOC
 func LibraryList(ctx context.Context, req *rpc.LibraryListReq) (*rpc.LibraryListResp, error) {
+	pm := commands.GetPackageManager(req.GetInstance().GetId())
+	if pm == nil {
+		return nil, errors.New("invalid instance")
+	}
+
 	lm := commands.GetLibraryManager(req.GetInstance().GetId())
+	if lm == nil {
+		return nil, errors.New("invalid instance")
+	}
+
+	nameFilter := strings.ToLower(req.GetName())
 
 	instaledLib := []*rpc.InstalledLibrary{}
 	res := listLibraries(lm, req.GetUpdatable(), req.GetAll())
 	if len(res) > 0 {
+		if f := req.GetFqbn(); f != "" {
+			fqbn, err := cores.ParseFQBN(req.GetFqbn())
+			if err != nil {
+				return nil, fmt.Errorf("parsing fqbn: %s", err)
+			}
+			_, boardPlatform, _, _, refBoardPlatform, err := pm.ResolveFQBN(fqbn)
+			if err != nil {
+				return nil, fmt.Errorf("loading board data: %s", err)
+			}
+
+			filteredRes := map[string]*installedLib{}
+			for _, lib := range res {
+				if cp := lib.Library.ContainerPlatform; cp != nil {
+					if cp != boardPlatform && cp != refBoardPlatform {
+						// Filter all libraries from extraneous platforms
+						continue
+					}
+				}
+				if latest, has := filteredRes[lib.Library.Name]; has {
+					if latest.Library.LocationPriorityFor(boardPlatform, refBoardPlatform) >= lib.Library.LocationPriorityFor(boardPlatform, refBoardPlatform) {
+						continue
+					}
+				}
+				filteredRes[lib.Library.Name] = lib
+			}
+
+			res = []*installedLib{}
+			for _, lib := range filteredRes {
+				res = append(res, lib)
+			}
+		}
+
 		for _, lib := range res {
+			if nameFilter != "" && strings.ToLower(lib.Library.Name) != nameFilter {
+				continue
+			}
 			libtmp := GetOutputLibrary(lib.Library)
 			release := GetOutputRelease(lib.Available)
 			instaledLib = append(instaledLib, &rpc.InstalledLibrary{
@@ -117,6 +166,7 @@ func GetOutputLibrary(lib *libraries.Library) *rpc.Library {
 		IsLegacy:          lib.IsLegacy,
 		Version:           lib.Version.String(),
 		License:           lib.License,
+		Examples:          lib.Examples.AsStrings(),
 	}
 }
 

rpc/commands/lib.pb.go

@@ -1326,6 +1326,11 @@ type LibraryListReq struct {
 	// Whether to list only libraries for which there is a newer version than
 	// the installed version available in the libraries index.
 	Updatable bool `protobuf:"varint,3,opt,name=updatable,proto3" json:"updatable,omitempty"`
+	// If set filters out the libraries not matching name
+	Name string `protobuf:"bytes,4,opt,name=name,proto3" json:"name,omitempty"`
+	// By setting this field all duplicate libraries are filtered out leaving
+	// only the libraries that will be used to compile for the specified board FQBN.
+	Fqbn string `protobuf:"bytes,5,opt,name=fqbn,proto3" json:"fqbn,omitempty"`
 }
 
 func (x *LibraryListReq) Reset() {
@@ -1381,6 +1386,20 @@ func (x *LibraryListReq) GetUpdatable() bool {
 	return false
 }
 
+func (x *LibraryListReq) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *LibraryListReq) GetFqbn() string {
+	if x != nil {
+		return x.Fqbn
+	}
+	return ""
+}
+
 type LibraryListResp struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1543,6 +1562,8 @@ type Library struct {
 	Location LibraryLocation `protobuf:"varint,24,opt,name=location,proto3,enum=cc.arduino.cli.commands.LibraryLocation" json:"location,omitempty"`
 	// The library format type.
 	Layout LibraryLayout `protobuf:"varint,25,opt,name=layout,proto3,enum=cc.arduino.cli.commands.LibraryLayout" json:"layout,omitempty"`
+	// The example sketches provided by the library
+	Examples []string `protobuf:"bytes,26,rep,name=examples,proto3" json:"examples,omitempty"`
 }
 
 func (x *Library) Reset() {
@@ -1738,6 +1759,13 @@ func (x *Library) GetLayout() LibraryLayout {
 	return LibraryLayout_flat_layout
 }
 
+func (x *Library) GetExamples() []string {
+	if x != nil {
+		return x.Examples
+	}
+	return nil
+}
+
 var File_commands_lib_proto protoreflect.FileDescriptor
 
 var file_commands_lib_proto_rawDesc = []byte{
@@ -1915,103 +1943,107 @@ var file_commands_lib_proto_rawDesc = []byte{
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 }
 
 var (

rpc/commands/lib.proto

@@ -193,7 +193,12 @@ message LibraryListReq {
     bool all = 2;
     // Whether to list only libraries for which there is a newer version than
     // the installed version available in the libraries index.
-	bool updatable = 3;
+    bool updatable = 3;
+    // If set filters out the libraries not matching name
+    string name = 4;
+    // By setting this field all duplicate libraries are filtered out leaving
+    // only the libraries that will be used to compile for the specified board FQBN.
+    string fqbn = 5;
 }
 
 message LibraryListResp {
@@ -261,6 +266,8 @@ message Library {
     LibraryLocation location = 24;
     // The library format type.
     LibraryLayout layout = 25;
+    // The example sketches provided by the library
+    repeated string examples = 26;
 }
 
 enum LibraryLayout {