now 'board listall' command accept search params

Author: cmaglie

README.md

@@ -306,4 +306,13 @@ arduino:samd	1.6.19 	Arduino SAMD Boards (32-bits ARM Cortex-M0+)
 
 once the core is determined you should install it with `arduino-cli core install arduino:samd` and, once installed, you can connect the board and detect it with `arduino-cli board list`.
 
-If the board is not detected for any reason, you can list all the supported boards with `arduino-cli board listall`
+If the board is not detected for any reason, you can list all the supported boards with `arduino-cli board listall` and also search for a specific board, in our example `arduino-cli board listall zero`.
+
+```
+$ arduino-cli board listall zero
+Board Name                              FQBN
+Arduino MKRZERO                         arduino:samd:mkrzero
+Arduino/Genuino Zero (Native USB Port)  arduino:samd:arduino_zero_native
+Arduino/Genuino Zero (Programming Port) arduino:samd:arduino_zero_edbg
+```
+

commands/board/listall.go

@@ -19,6 +19,7 @@ package board
 
 import (
 	"sort"
+	"strings"
 
 	"github.com/arduino/arduino-cli/commands"
 	"github.com/arduino/arduino-cli/common/formatter"
@@ -28,12 +29,16 @@ import (
 
 func initListAllCommand() *cobra.Command {
 	listAllCommand := &cobra.Command{
-		Use:     "listall",
-		Short:   "List all known boards.",
-		Long:    "List all boards that have the support platform installed.",
-		Example: "  " + commands.AppName + " board listall",
-		Args:    cobra.NoArgs,
-		Run:     runListAllCommand,
+		Use:   "listall [boardname]",
+		Short: "List all known boards and their corresponding FQBN.",
+		Long: "" +
+			"List all boards that have the support platform installed. You can search\n" +
+			"for a specific board if you specify the board name",
+		Example: "" +
+			"  " + commands.AppName + " board listall\n" +
+			"  " + commands.AppName + " board listall zero",
+		Args: cobra.ArbitraryArgs,
+		Run:  runListAllCommand,
 	}
 	return listAllCommand
 }
@@ -42,6 +47,16 @@ func initListAllCommand() *cobra.Command {
 func runListAllCommand(cmd *cobra.Command, args []string) {
 	pm := commands.InitPackageManager()
 
+	match := func(name string) bool {
+		name = strings.ToLower(name)
+		for _, term := range args {
+			if !strings.Contains(name, strings.ToLower(term)) {
+				return false
+			}
+		}
+		return true
+	}
+
 	list := &output.BoardList{}
 	for _, targetPackage := range pm.GetPackages().Packages {
 		for _, platform := range targetPackage.Platforms {
@@ -50,6 +65,9 @@ func runListAllCommand(cmd *cobra.Command, args []string) {
 				continue
 			}
 			for _, board := range platformRelease.Boards {
+				if !match(board.Name()) {
+					continue
+				}
 				list.Boards = append(list.Boards, &output.BoardListItem{
 					Name: board.Name(),
 					Fqbn: board.FQBN(),