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package bspc
import (
"io"
"bufio"
"strings"
"os/exec"
"encoding/json"
"hhvn.uk/hbspbar/common"
)
type State struct {
Monitors []*Monitor
}
type Monitor struct {
ID int
Rectangle *Rect
Desktops []*Desktop
}
type Rect struct {
X int
Y int
Width int
Height int
}
type Desktop struct {
Name string
Layout string
}
func LoadState() (*State, error) {
cmd := exec.Command("bspc", "wm", "-d")
out, err := cmd.StdoutPipe()
if err != nil {
return nil, common.Perror("cmd.StdoutPipe", err)
}
if err = cmd.Start(); err != nil {
return nil, common.Perror("cmd.Start", err)
}
data, err := io.ReadAll(out)
if err != nil {
return nil, common.Perror("io.ReadAll", err)
}
if err = cmd.Wait(); err != nil {
return nil, common.Perror("cmd.Wait", err)
}
var state State
err = json.Unmarshal(data, &state)
if err != nil {
return nil, common.Perror("json.Unmarshal", err)
}
return &state, nil
}
type Subscriber struct {
Event chan *Event
cleanup chan bool
cmd *exec.Cmd
pipe io.ReadCloser
scanner *bufio.Scanner
}
type Event struct {
Err error
Name string
Tokens []string
}
func Subscribe() (*Subscriber, error) {
cmd := exec.Command("bspc", "subscribe", "all")
pipe, err := cmd.StdoutPipe()
if err != nil {
return nil, common.Perror("cmd.StdoutPipe", err)
}
if err = cmd.Start(); err != nil {
return nil, common.Perror("cmd.Start", err)
}
var s Subscriber
s.Event = make(chan *Event)
s.cleanup = make(chan bool)
s.cmd = cmd
s.pipe = pipe
s.scanner = bufio.NewScanner(s.pipe)
go func() {
for {
select {
case <- s.cleanup:
s.cmd.Wait()
return
default:
if event := s.get(); event != nil {
s.Event <- event
}
}
}
}()
return &s, nil
}
func (s *Subscriber) Close() {
s.cleanup <- true
}
func (s *Subscriber) getLine() (string, error) {
if s.scanner.Scan() {
return s.scanner.Text(), nil
}
if err := s.scanner.Err(); err != nil {
return "", common.Perror("scanner.Err", err)
}
return "", nil
}
func (s *Subscriber) get() (*Event) {
var line string
var err error
for {
line, err = s.getLine()
if line[0] != 'W' { break }
}
if line == "" { return nil }
if err != nil { return &Event{err, "", nil} }
name, tokens, _ := strings.Cut(line, " ")
return &Event{nil, name, strings.Split(tokens, " ")}
}
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