164 lines
4.0 KiB
Go
164 lines
4.0 KiB
Go
package main
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import (
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"log"
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"os"
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"path"
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"errors"
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"github.com/fsnotify/fsnotify"
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"github.com/mkideal/cli"
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"github.com/tarm/serial"
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)
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func stop(exitCode int) {
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log.Println("Have a nice day.")
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os.Exit(exitCode)
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}
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type message struct {
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msgType byte
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data []byte
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}
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const (
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MSG_TYPE_ANSWER_OK = 0x01
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MSG_TYPE_ANSWER_NOOK = 0x02
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MSG_TYPE_AGENTID = 0x03
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MSG_TYPE_CONFIG = 0x04
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)
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func decodeByteString(bytes []byte, num int) (msg message, err error) {
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if bytes[0] == 0x3c && bytes[1] == 0x3e &&
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bytes[num-1] == 0x0A && bytes[num-2] == 0x0D {
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return message{msgType: bytes[2], data: bytes[3:num-2]}, nil
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}
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return message{msgType: 0x00, data: make([]byte, 1)}, errors.New("Can't decode the byte array.")
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}
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func waitAndExecuteCommandsFromDevice(serial *serial.Port) {
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buffer := make([]byte, 40)
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for {
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num, err := serial.Read(buffer)
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if err != nil {
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log.Fatal(err)
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}
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input, err := decodeByteString(buffer, num)
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if err != nil {
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log.Fatal(err)
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} else {
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switch (input.msgType) {
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case MSG_TYPE_AGENTID:
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log.Printf("Key pressed: %d", input.data[0])
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default:
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log.Fatal("Can't recognize the message type.")
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}
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}
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}
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}
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func watchForConfigChanges(configFile string, serial *serial.Port) {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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log.Fatal(err)
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}
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defer watcher.Close()
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done := make(chan bool)
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go func() {
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for {
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select {
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case event := <-watcher.Events:
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// The file is changed. This is the only event we are interested
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// in. If the file is renamed, removed or something else, we drop
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// an error to the user.
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if event.Op&fsnotify.Write == fsnotify.Write ||
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event.Op&fsnotify.Remove == fsnotify.Remove {
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if _, err := os.Stat(event.Name); err == nil {
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log.Println("Reload the config file ...")
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// TODO: Parse the config file
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// TODO: Handle errors in the config file
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// TODO: Write a mapping for the mapping of the keys to the binary format the avr wants.
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// TODO: Establish a connection to the device
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// TODO: Transfer the new key mappings
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// TODO: Close the connection?
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}
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}
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// Some editors have a feature called "swap save" (like vim), which
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// will trigger a simple WRITE event, instead it wil trigger RENAME
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// -> CHMOD -> REMOVE in that order. So we lost track of the file.
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// To prevent this, we add the file again, if it exist after a
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// REMOVE event.
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if event.Op&fsnotify.Remove == fsnotify.Remove {
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if _, err := os.Stat(event.Name); err == nil {
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watcher.Add(event.Name)
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} else {
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log.Fatal("Lost the configuration file. We stop now.")
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stop(1)
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}
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}
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case err := <-watcher.Errors:
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log.Println("We have the following problem with the configuration file: ", err)
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log.Println("Try the fix this problem by yourself and restart the agent.")
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stop(2)
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}
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}
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}()
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err = watcher.Add(configFile)
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if err != nil {
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log.Fatal("Can't find the configuration file. Please create one.")
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}
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<-done
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}
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type argT struct {
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cli.Helper
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ConfigFile string `cli:"c,config" usage:"specify a keymap config file"`
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Device string `cli:"d,device" usage:"specify the serial port, the n3rdpad is hooked to"`
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}
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func main() {
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configPath, _ := os.Getwd()
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configFile := path.Join(configPath, "keymap.conf")
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cli.Run(&argT{}, func(ctx *cli.Context) error {
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args := ctx.Argv().(*argT)
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if args.ConfigFile != "" {
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configFile = args.ConfigFile
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}
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if args.Device == "" {
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log.Fatal("You need to specify the serial device with the --device parameter.")
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stop(3)
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}
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if !args.Help {
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// Start up the application
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log.Println("Using the configuration file", configFile)
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// Open the serial connection
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config := &serial.Config{Name: args.Device, Baud: 115200}
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serial, err := serial.OpenPort(config)
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if err != nil {
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log.Fatal(err)
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return nil
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}
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log.Printf("Open the connection to the n3rdpad over %s", args.Device)
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go watchForConfigChanges(configFile, serial)
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waitAndExecuteCommandsFromDevice(serial)
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stop(0)
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}
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return nil
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})
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}
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