Improve evlist and rename it evinfo (#12)

Reviewed-on: #12

cmd/evinfo/main.go

@@ -0,0 +1,99 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+
+	// TODO: using config here feels like bad coupling... ButtonFromIndex might need a refactor / move
+	"git.annabunches.net/annabunches/joyful/internal/config"
+	"git.annabunches.net/annabunches/joyful/internal/logger"
+	"github.com/holoplot/go-evdev"
+	flag "github.com/spf13/pflag"
+)
+
+func isJoystickLike(device *evdev.InputDevice) bool {
+	types := device.CapableTypes()
+	if slices.Contains(types, evdev.EV_ABS) {
+		return true
+	}
+
+	if slices.Contains(types, evdev.EV_KEY) {
+		buttons := device.CapableEvents(evdev.EV_KEY)
+
+		for _, code := range config.ButtonFromIndex {
+			if slices.Contains(buttons, code) {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+func printDevice(devPath evdev.InputPath) {
+	// Get the device
+	device, err := evdev.Open(devPath.Path)
+	if err != nil {
+		fmt.Printf("ERROR: Couldn't get data for device '%s'\n", devPath.Name)
+		return
+	}
+
+	// If the device doesn't support any joystick-shaped inputs, don't print it.
+	if !isJoystickLike(device) {
+		return
+	}
+
+	// Get axis info
+	var axisOutputs []string
+	absInfos, err := device.AbsInfos()
+	if err != nil {
+		axisOutputs = []string{"ERROR: Failed to get axis data"}
+	} else {
+		axisOutputs = make([]string, 0, len(absInfos))
+		for axisCode, info := range absInfos {
+			absStr := fmt.Sprintf("%s: %d - %d", evdev.ABSNames[axisCode], info.Minimum, info.Maximum)
+			axisOutputs = append(axisOutputs, absStr)
+		}
+	}
+
+	fmt.Printf("%s:\n", devPath.Path)
+	fmt.Printf("\tName: '%s'\n", devPath.Name)
+	if len(axisOutputs) > 0 {
+		fmt.Println("\tAxes:")
+		for _, str := range axisOutputs {
+			fmt.Printf("\t\t%s\n", str)
+		}
+	}
+}
+
+func printDeviceQuiet(devPath evdev.InputPath) {
+	// If it's not at least minimally joystick-shaped, skip.
+	// If we can't open the device, err on the side of printing it
+	// anyway
+	device, err := evdev.Open(devPath.Path)
+	if err != nil ||
+		!isJoystickLike(device) {
+		return
+	}
+
+	fmt.Printf("'%s'\n", devPath.Name)
+}
+
+// TODO: it would be nice to be able to specify a device by name or device file and get axis info
+// just for that device
+func main() {
+	var quietFlag bool
+	flag.BoolVarP(&quietFlag, "quiet", "q", false, "Only print device names")
+	flag.Parse()
+
+	devices, err := evdev.ListDevicePaths()
+	logger.FatalIfError(err, "")
+
+	for _, device := range devices {
+		if quietFlag {
+			printDeviceQuiet(device)
+		} else {
+			printDevice(device)
+		}
+	}
+}