Added implementation for LibraryResolveDependency grpc call

Author: cmaglie

Diff for: commands/lib/resolve_deps.go

@@ -19,11 +19,43 @@ package lib
 
 import (
 	"context"
+	"fmt"
 
+	"github.com/arduino/arduino-cli/arduino/libraries"
+	"github.com/arduino/arduino-cli/commands"
 	rpc "github.com/arduino/arduino-cli/rpc/commands"
 )
 
 // LibraryResolveDependencies FIXMEDOC
 func LibraryResolveDependencies(ctx context.Context, req *rpc.LibraryResolveDependenciesReq) (*rpc.LibraryResolveDependenciesResp, error) {
-	return &rpc.LibraryResolveDependenciesResp{}, nil
+	lm := commands.GetLibraryManager(req.GetInstance().GetId())
+
+	// Search the requested lib
+	reqLibRelease, err := findLibraryIndexRelease(lm, req)
+	if err != nil {
+		return nil, fmt.Errorf("looking for library: %s", err)
+	}
+
+	// Extract all installed libraries
+	installedLibs := map[string]*libraries.Library{}
+	for _, lib := range listLibraries(lm, false, false) {
+		installedLibs[lib.Library.Name] = lib.Library
+	}
+
+	// Resolve all dependencies...
+	deps := lm.Index.ResolveDependencies(reqLibRelease)
+	res := []*rpc.LibraryDependencyStatus{}
+	for _, dep := range deps {
+		// ...and add information on currently installed versions of the libraries
+		installed := ""
+		if installedLib, has := installedLibs[dep.GetName()]; has {
+			installed = installedLib.Version.String()
+		}
+		res = append(res, &rpc.LibraryDependencyStatus{
+			Name:             dep.GetName(),
+			VersionRequired:  dep.GetVersion().String(),
+			VersionInstalled: installed,
+		})
+	}
+	return &rpc.LibraryResolveDependenciesResp{Dependencies: res}, nil
 }