housekeeping: Refactored API to separate packages

config/config.go

@@ -1,9 +1,11 @@
-package main
+package config
 
 import (
 	"fmt"
 	"os"
 
+	"git.datalore.sh/datalore/midi-hid/translation"
+
 	"github.com/goccy/go-yaml"
 	"github.com/bendahl/uinput"
 	"github.com/charmbracelet/log"
@@ -84,8 +86,8 @@ func ParseConfig(path string) (Config, error) {
 
 // Construct iterates over all ControllerConfigs and constructs the Controller objects.
 // In case of a failure, it aborts and returns an error.
-func (config Config) Construct() (ControllerList, error) {
-	var controllerList ControllerList
+func (config Config) Construct() (translation.ControllerList, error) {
+	var controllerList translation.ControllerList
 
 	for _, controllerConfig := range config.Controller {
 		actualController, err := controllerConfig.Construct()
@@ -102,8 +104,8 @@ func (config Config) Construct() (ControllerList, error) {
 // Construct builds a Controller object and its corresponding mappings.
 // Aborts and returns an error if the midi port was not found or one of
 // the Mappings is invalid.
-func (cc ControllerConfig) Construct() (*Controller, error) {
-	actualController, err := NewController(cc.PortName, cc.VendorID, cc.ProductID)
+func (cc ControllerConfig) Construct() (*translation.Controller, error) {
+	actualController, err := translation.NewController(cc.PortName, cc.VendorID, cc.ProductID)
 	if err != nil {
 		return actualController, err
 	}
@@ -121,28 +123,28 @@ func (cc ControllerConfig) Construct() (*Controller, error) {
 }
 
 // Construct builds the Mapping object. Returns an error if config is invalid.
-func (mc MappingConfig) Construct() (Mapping, error) {
+func (mc MappingConfig) Construct() (translation.Mapping, error) {
 	switch mc.Type {
 	case ButtonMappingType:
 		button, err := mc.Button.Construct()
 		if err != nil {
-			return ButtonMapping{}, err
+			return translation.ButtonMapping{}, err
 		}
 
 		log.Debug("Parsed button mapping", "comment", mc.Comment, "midiChannel", mc.MidiChannel, "midiKey", mc.MidiKey, "button", button)
 
-		return ButtonMapping{mc.Comment, mc.MidiChannel, mc.MidiKey, button}, nil
+		return translation.ButtonMapping{mc.Comment, mc.MidiChannel, mc.MidiKey, button}, nil
 	case ControlMappingType:
 		axis, err := mc.Axis.Construct()
 		if err != nil {
-			return ControlMapping{}, err
+			return translation.ControlMapping{}, err
 		}
 
 		log.Debug("Parsed control mapping", "comment", mc.Comment, "midiChannel", mc.MidiChannel, "midiController", mc.MidiController, "axis", axis, "isSigned", mc.IsSigned, "deadzone", mc.Deadzone)
 
-		return ControlMapping{mc.Comment, mc.MidiChannel, mc.MidiController, axis, mc.IsSigned, mc.Deadzone}, nil
+		return translation.ControlMapping{mc.Comment, mc.MidiChannel, mc.MidiController, axis, mc.IsSigned, mc.Deadzone}, nil
 	default:
-		return ButtonMapping{}, fmt.Errorf("Invalid mapping type")
+		return translation.ButtonMapping{}, fmt.Errorf("Invalid mapping type")
 	}
 }
 
@@ -189,16 +191,16 @@ func (bn ButtonName) Construct() (int, error) {
 
 // Construct converts an AxisName into the internal representation for a ControllerAxis.
 // Returns an error if AxisName is invalid.
-func (an AxisName) Construct() (ControllerAxis, error) {
+func (an AxisName) Construct() (translation.ControllerAxis, error) {
 	switch an {
 	case AxisLeftX:
-		return LeftX, nil
+		return translation.LeftX, nil
 	case AxisLeftY:
-		return LeftY, nil
+		return translation.LeftY, nil
 	case AxisRightX:
-		return RightX, nil
+		return translation.RightX, nil
 	case AxisRightY:
-		return RightY, nil
+		return translation.RightY, nil
 	default:
 		return -1, fmt.Errorf("Invalid axis name \"%s\"", an)
 	}

main.go

@@ -5,6 +5,8 @@ import (
 	"os"
 	"os/signal"
 
+	"git.datalore.sh/datalore/midi-hid/config"
+
 	"github.com/charmbracelet/log"
 	"gitlab.com/gomidi/midi/v2"
 )
@@ -34,8 +36,8 @@ func main() {
 	}
 
 	log.Info("Starting...")
-	config := must(ParseConfig(configPath))
-	controllerList := must(config.Construct())
+	conf := must(config.ParseConfig(configPath))
+	controllerList := must(conf.Construct())
 	defer controllerList.Stop()
 
 	// wait for SIGINT

translation/controller.go

@@ -1,4 +1,4 @@
-package main
+package translation
 
 import (
 	"github.com/charmbracelet/log"

translation/mapping.go

@@ -1,4 +1,4 @@
-package main
+package translation
 
 import (
 	"fmt"
@@ -18,10 +18,10 @@ type Mapping interface {
 
 // A ButtonMapping maps a MIDI Note to a gamepad button.
 type ButtonMapping struct {
-	comment string
-	midiChannel uint8
-	midiKey uint8
-	gamepadKey int
+	CommentStr string
+	MidiChannel uint8
+	MidiKey uint8
+	GamepadKey int
 }
 
 // Is checks if the MIDI message msg triggers this Mapping, without actually triggering it.
@@ -30,7 +30,7 @@ func (m ButtonMapping) Is(msg midi.Message) bool {
 
 	switch {
 	case msg.GetNoteOn(&channel, &key, nil), msg.GetNoteOff(&channel, &key, nil):
-		return (m.midiChannel == channel && m.midiKey == key)
+		return (m.MidiChannel == channel && m.MidiKey == key)
 	default:
 		return false
 	}
@@ -45,13 +45,13 @@ func (m ButtonMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Gamep
 		switch msg.Type() {
 		case midi.NoteOnMsg:
 			if velocity != 0 {
-				log.Debug(m.comment, "status", "down")
-				return virtGamepad.ButtonDown(m.gamepadKey)
+				log.Debug(m.CommentStr, "status", "down")
+				return virtGamepad.ButtonDown(m.GamepadKey)
 			}
 			fallthrough // if reached here, velocity is 0 -> NoteOff
 		case midi.NoteOffMsg:
-			log.Debug(m.comment, "status", "up")
-			return virtGamepad.ButtonUp(m.gamepadKey)
+			log.Debug(m.CommentStr, "status", "up")
+			return virtGamepad.ButtonUp(m.GamepadKey)
 		default:
 			return fmt.Errorf("Invalid message type triggered ButtonMapping")
 		}
@@ -62,7 +62,7 @@ func (m ButtonMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Gamep
 
 // Comment returns the Mappings comment.
 func (m ButtonMapping) Comment() string {
-	return m.comment
+	return m.CommentStr
 }
 
 type ControllerAxis int
@@ -75,12 +75,12 @@ const (
 )
 
 type ControlMapping struct {
-	comment string
-	midiChannel uint8
-	midiController uint8
-	axis ControllerAxis
-	isSigned bool
-	deadzone float64
+	CommentStr string
+	MidiChannel uint8
+	MidiController uint8
+	Axis ControllerAxis
+	IsSigned bool
+	Deadzone float64
 }
 
 // Is checks if the MIDI message msg triggers this Mapping, without actually triggering it.
@@ -88,7 +88,7 @@ func (m ControlMapping) Is(msg midi.Message) bool {
 	var channel, controller uint8
 
 	if msg.GetControlChange(&channel, &controller, nil) {
-		return (m.midiChannel == channel && m.midiController == controller)
+		return (m.MidiChannel == channel && m.MidiController == controller)
 	} else {
 		return false
 	}
@@ -107,18 +107,18 @@ func (m ControlMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Game
 
 		// value is 0-127, normalise
 		valueNormalised = float64(valueAbsolute) / 127
-		if m.isSigned {
+		if m.IsSigned {
 			valueNormalised *= 2
 			valueNormalised -= 1
 		}
 
-		if math.Abs(valueNormalised) < m.deadzone {
+		if math.Abs(valueNormalised) < m.Deadzone {
 			valueNormalised = 0
 		}
 
-		log.Debug(m.comment, "value", valueNormalised, "deadzone", m.deadzone)
+		log.Debug(m.CommentStr, "value", valueNormalised, "deadzone", m.Deadzone)
 
-		switch m.axis {
+		switch m.Axis {
 		case LeftX:
 			return virtGamepad.LeftStickMoveX(float32(valueNormalised))
 		case LeftY:
@@ -135,5 +135,5 @@ func (m ControlMapping) TriggerIfMatch(msg midi.Message, virtGamepad uinput.Game
 
 // Comment returns the Mappings comment.
 func (m ControlMapping) Comment() string {
-	return m.comment
+	return m.CommentStr
 }

translation/midi.go

@@ -1,4 +1,4 @@
-package main
+package translation
 
 import (
 	"gitlab.com/gomidi/midi/v2"