xrandr/display_config.go

package xrandr

import (
	"encoding/json"
	"errors"
	"regexp"
	"strings"

	"git.milar.in/milarin/bufr"
)

var (
	displayConfig = regexp.MustCompile(`^(.*?-\d) (disconnected|connected)( primary)?(?: (\d*?)x(\d*?)\+(\d*?)\+(\d*?) )?(normal|inverted|left|right)?\s*?(X axis|Y axis|X and Y axis)?\s*?\(((?:normal |left |inverted |right |x axis |y axis )*(?:normal|left|inverted|right|x axis|y axis))\)(?: (\d*)mm x (\d*)mm)?$`)
)

type DisplayConfig struct {
	Port       string      `json:"port"`
	Connected  bool        `json:"connected"`
	Primary    bool        `json:"primary"`
	Resolution *Resolution `json:"resolution"`
	Position   *Position   `json:"position"`
	Rotation   Rotation    `json:"rotation"`
	Reflection Reflection  `json:"reflection"`

	RecommendedMode *DisplayMode
	ActiveMode      *DisplayMode
	Modes           []DisplayMode `json:"modes"`

	DimensionsMillimeter *Resolution `json:"-"`
}

func parseDisplayConfig(r *bufr.Reader) (*DisplayConfig, error) {
	// bufcontent := reflect.ValueOf(r).Elem().FieldByName("buf").Elem().FieldByName("values")
	// bufcontent = reflect.NewAt(bufcontent.Type(), unsafe.Pointer(bufcontent.UnsafeAddr())).Elem()
	// fmt.Printf("%#v\n", string(bufcontent.Interface().([]rune)))
	line, err := r.StringUntil(isNewLine)
	if err != nil {
		return nil, err
	}
	matches := displayConfig.FindStringSubmatch(line)

	if matches == nil {
		return nil, errors.New("no data")
	}

	active, recommended, modes, err := parseDisplayModes(r)
	if err != nil {
		return nil, err
	}

	return &DisplayConfig{
		Port:                 matches[1],
		Connected:            strings.TrimSpace(matches[2]) == "connected",
		Primary:              strings.TrimSpace(matches[3]) == "primary",
		Resolution:           NewResolutionFromString(matches[4], matches[5]),
		Position:             NewPositionFromString(matches[6], matches[7]),
		Rotation:             makeRotation(matches[8]),
		Reflection:           MakeReflection(matches[9]),
		DimensionsMillimeter: NewResolutionFromString(matches[11], matches[12]),
		ActiveMode:           active,
		RecommendedMode:      recommended,
		Modes:                modes,
	}, nil
}

func (c DisplayConfig) String() string {
	data, _ := json.MarshalIndent(c, "", "\t")
	return string(data)
}