Adding a way to find new devices

cmd/repl.go

@@ -1,17 +1,35 @@
 package cmd
 
 import (
+	"esdi/peripheral"
 	"esdi/repl"
 
 	"github.com/spf13/cobra"
 )
 
 func replCmdAction(cmd *cobra.Command, args []string) {
-	repl := repl.NewREPL(repl.REPLCfg{
+	r := repl.NewREPL(repl.REPLCfg{
 		PS1: "\rESDI > ",
 	})
-	repl.Start()
-	repl.Close()
+
+	listDevicesREPLCmd := repl.Command{
+		Name:  "ls",
+		Usage: "lists the currently available devices",
+		Action: func(r *repl.REPL, args []string) error {
+			perClerk := peripheral.NewPeripheralDeviceClerk()
+			err := perClerk.FindDevices()
+			if err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+
+	r.RegisterCMD(listDevicesREPLCmd)
+
+	r.Start()
+	r.Close()
 }
 
 // removeLabelCmd represents the removeLabel command

peripheral/peripheral.go

@@ -0,0 +1,51 @@
+// Package peripheral will handle communicating with peripherals
+package peripheral
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+type PeripheralType string
+
+const (
+	DisplayPeripheral PeripheralType = "display"
+)
+
+type PeripheralDevice struct {
+	Port string
+	Name [32]byte
+}
+
+type PeripheralDeviceClerk struct {
+	Devices map[string]PeripheralDevice
+}
+
+func NewPeripheralDeviceClerk() *PeripheralDeviceClerk {
+	return &PeripheralDeviceClerk{}
+}
+
+func (clerk *PeripheralDeviceClerk) listPorts() ([]string, error) {
+	ttyUSBs, err := filepath.Glob("/dev/ttyUSB*")
+	if err != nil {
+		return []string{}, err
+	}
+
+	return ttyUSBs, nil
+}
+
+func (clerk *PeripheralDeviceClerk) FindDevices() error {
+	ports, err := clerk.listPorts()
+	if err != nil {
+		return err
+	}
+
+	for _, p := range ports {
+		fmt.Println(p)
+	}
+
+	return nil
+}
+
+// Add a peripheral device manager
+// Something that auto discovers available devices

repl/repl.go

@@ -38,8 +38,9 @@ func (r *REPL) Close() {
 	// Do whatever cleanup we have to do
 }
 
-func (r *REPL) RegisterCMD() {
-	// Code to register a new command
+func (r *REPL) RegisterCMD(newCMD Command) {
+	// Add a verification to check that the command doesn't exist. Fatal if it does
+	r.Commands[newCMD.Name] = newCMD
 }
 
 func (r *REPL) printPrompt() {