Initial commit

stdin.go

@@ -0,0 +1,175 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"log"
+	"os"
+	"strings"
+)
+
+// ClickEvent struct as described at https://i3wm.org/docs/i3bar-protocol.html
+type ClickEvent struct {
+	Name      string   `json:"name,omitempty"`
+	Instance  string   `json:"instance,omitempty"`
+	Button    int      `json:"button"`
+	Modifiers []string `json:"modifiers"`
+	X         int      `json:"x"`
+	Y         int      `json:"y"`
+	RelativeX int      `json:"relative_x"`
+	RelativeY int      `json:"relative_y"`
+	OutputX   int      `json:"output_x"`
+	OutputY   int      `json:"output_y"`
+	Width     int      `json:"width"`
+	Height    int      `json:"height"`
+}
+
+// ParseStdin tries to parse text that i3bar prints to our stdin. Currently - it is mouse click events on different
+// area names of i3bar.
+func ParseStdin() {
+	reader := bufio.NewReader(os.Stdin)
+
+	// De-facto it is jsonl, except first line is garbage. Also, first symbol in each strint garbage too.
+	firstelem := true
+
+	for {
+		var e ClickEvent
+
+		buf, err := reader.ReadString('\n')
+
+		if err != nil {
+			if !firstelem {
+				log.Printf("Unable to read from stdin: %s", err)
+			}
+
+			break
+		}
+
+		if len(buf) == 0 {
+			log.Print("String from stdin has zero length, skipping")
+
+			continue
+		}
+
+		for i := 0; i < len(buf); i++ {
+			if strings.HasPrefix(buf, "{") {
+				break
+			}
+
+			buf = buf[1:]
+		}
+
+		if len(buf) == 0 {
+			log.Print("String from stdin has zero length, skipping")
+
+			continue
+		}
+
+		err = json.Unmarshal([]byte(buf), &e)
+
+		if err != nil {
+			if firstelem {
+				firstelem = false
+			} else {
+				log.Printf("Unable to decode json line from stdin: %s, buf: %s", err, buf)
+			}
+
+			continue
+		}
+
+		// Just in case.
+		if firstelem {
+			firstelem = false
+		}
+
+		// Clock clicks parse.
+		if e.Name == "wallclock" {
+			if Conf.Clock.LeftClick.Enabled && e.Button == 1 {
+				RunChan <- Conf.Clock.LeftClick.Cmd
+			} else if Conf.Clock.RightClick.Enabled && e.Button == 3 {
+				RunChan <- Conf.Clock.RightClick.Cmd
+			}
+
+			continue
+		}
+
+		if e.Name == "simple-volume-pa" {
+			if Conf.SimpleVolumePa.Enabled {
+				if e.Button == 3 {
+					RunChan <- Conf.SimpleVolumePa.RightClickCmd
+
+					continue
+				}
+
+				vol, err := pa.Volume()
+
+				if err != nil {
+					if err := PaReinit(); err != nil {
+						log.Printf("Unable to get pulseaudio volume: %s", err)
+					} else {
+						vol, err = pa.Volume()
+
+						if err != nil {
+							log.Printf("Unable to get volume pulseaudio server behaves weirdly: %s", err)
+						}
+					}
+				}
+
+				switch e.Button {
+				case Conf.SimpleVolumePa.WheelUp:
+					vol += float32(Conf.SimpleVolumePa.Step) / 100
+
+					if vol > (float32(Conf.SimpleVolumePa.MaxVolumeLimit) / 100) {
+						vol = float32(Conf.SimpleVolumePa.MaxVolumeLimit) / 100
+					}
+
+					if err := pa.SetVolume(vol); err != nil {
+						log.Printf("Unable to set pulseaudio volume: %s", err)
+					}
+
+				case Conf.SimpleVolumePa.WheelDown:
+					vol -= float32(Conf.SimpleVolumePa.Step) / 100
+
+					if vol < 0 {
+						vol = 0
+					}
+
+					if err := pa.SetVolume(vol); err != nil {
+						log.Printf("Unable to set pulseaudio volume: %s", err)
+					}
+				}
+			}
+
+			continue
+		}
+
+		if !Conf.AppButtons {
+			continue
+		}
+
+		for _, app := range Conf.Apps {
+			switch {
+			case app.Name != "" && app.Instance != "":
+				if app.Name == e.Name && app.Instance == e.Instance {
+					prg := append([]string{}, app.Cmd)
+					prg = append(prg, app.Args...)
+
+					RunChan <- prg
+
+					break
+				}
+			case app.Name != "" && e.Name == app.Name:
+				prg := append([]string{}, app.Cmd)
+				prg = append(prg, app.Args...)
+
+				RunChan <- prg
+
+			case app.Instance != "" && e.Instance == app.Instance:
+				prg := append([]string{}, app.Cmd)
+				prg = append(prg, app.Args...)
+
+				RunChan <- prg
+			}
+		}
+	}
+}