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package bspc // import "hhvn.uk/hbspbar/bspc"
import (
"io"
"fmt"
"time"
"sync"
"bufio"
"errors"
"strings"
"os/exec"
"encoding/json"
"hhvn.uk/hbspbar/common"
)
var ErrMonNotFound = errors.New("monitor not found")
type State struct {
Monitors []*Monitor
FocusedMonitorID int
}
func (s *State) GetMon(id int) (*Monitor, error) {
for _, m := range s.Monitors {
if m.ID == id {
return m, nil
}
}
return nil, ErrMonNotFound
}
type Monitor struct {
Focused bool
ID int
Name string
Rectangle *Rect
Desktops []*Desktop
FocusedDesktopID int
}
func (m *Monitor) TopPadding(px uint) {
Cmd("config", "-m", fmt.Sprintf("%d", m.ID),
"top_padding", fmt.Sprintf("%d", px))
}
type Rect struct {
X uint
Y uint
Width uint
Height uint
}
type Node struct {
ID int
FirstChild *Node
SecondChild *Node
}
type Desktop struct {
Focused bool
Name string
Layout string
ID int
Root *Node
}
var reloadEvents = []string{
"monitor_rename",
"monitor_swap",
"monitor_focus",
"monitor_remove",
"monitor_geometry", // only event we get for monitors on restart
"desktop_add",
"desktop_rename",
"desktop_remove",
"desktop_swap",
"desktop_transfer",
"desktop_focus",
"desktop_activate",
"desktop_layout",
"node_add",
"node_remove",
"node_swap",
"node_transfer" }
func getState() (*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)
}
for _, m := range state.Monitors {
m.Focused = m.ID == state.FocusedMonitorID
for _, d := range m.Desktops {
d.Focused = d.ID == m.FocusedDesktopID
}
}
return &state, nil
}
type event struct {
Name string
Tokens []string
}
var InitErr error
var NewState = make(chan *State, 1) // Buffered to prevent blocking on first send
var StErr = make(chan error)
var Event = make(chan *event)
var EvErr = make(chan error)
func init() {
cmd := exec.Command("bspc", "subscribe", "all")
cmdRegister(cmd)
pipe, err := cmd.StdoutPipe()
if err != nil {
InitErr = common.Perror("cmd.StdoutPipe", err)
return
}
if err = cmd.Start(); err != nil {
InitErr = common.Perror("cmd.Start", err)
return
}
istate, err := getState()
if err != nil {
InitErr = common.Perror("getState", err)
return
}
NewState <- istate
scanner := bufio.NewScanner(pipe)
go func() { for {
event, err := get(scanner)
if event != nil {
for i := 0; i < len(reloadEvents); i++ {
if event.Name == reloadEvents[i] {
state, serr := getState()
if serr != nil {
StErr <- serr
return
}
NewState <- state
}
}
Event <- event
}
if err != nil {
EvErr <- err
return
}
}}()
}
func getLine(s *bufio.Scanner) (string, error) {
if s.Scan() {
return s.Text(), nil
}
if err := s.Err(); err != nil {
return "", common.Perror("scanner.Err", err)
}
return "", nil
}
func get(s *bufio.Scanner) (*event, error) {
var line string
var err error
for {
line, err = getLine(s)
if len(line) > 0 && line[0] != 'W' { break }
}
if line == "" { return nil, nil }
if err != nil { return nil, err }
name, tokens, _ := strings.Cut(line, " ")
return &event{name, strings.Split(tokens, " ")}, nil
}
var cmdlist []*exec.Cmd
var cmdlock sync.Mutex
func cmdRegister(c *exec.Cmd) int {
cmdlock.Lock()
defer cmdlock.Unlock()
for i, v := range cmdlist {
if v == nil {
cmdlist[i] = c
return i
}
}
cmdlist = append(cmdlist, c)
i := len(cmdlist) - 1
return i
}
func cmdDelete(i int) {
cmdlock.Lock()
defer cmdlock.Unlock()
cmdlist[i] = nil
}
func Cmd(args ...string) {
cmd := exec.Command("bspc", args...)
cmdi := cmdRegister(cmd)
pipe, _ := cmd.StderrPipe()
scan := bufio.NewScanner(pipe)
startt := time.Now()
cmd.Start()
for scan.Scan() {
common.Error("[Started %v] `bspc %v`: %v\n",
startt.Format("15:04:05.00"), args, scan.Text())
}
if err := scan.Err(); err != nil {
common.Perror("scan.Err", err)
}
cmd.Wait()
cmdDelete(cmdi)
}
func Cleanup() {
for _, c := range cmdlist {
if c != nil {
c.Process.Kill()
}
}
}
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