Add nucular-based prototype of force-quit-gui
Evaluates dropping the GTK3 dependency in favor of a pure-Go, no-cgo toolkit. Built with -tags nucular_shiny to force the x11driver backend (nucular's default backend now pulls in Gio/cgo/EGL, which would defeat the purpose). Reads Xft.dpi directly via xgb for HiDPI scaling, since nucular has no built-in DPI awareness. Known gap: x11driver exposes no iconify/withdraw call, so unlike the GTK version, closing the window exits the process instead of hiding it. Tracked as a TODO in the file header for follow-up. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Philip Peterson
parent
20abe80132
commit
4efaa8ddee
3 changed files with 289 additions and 3 deletions
228
cmd/force-quit-gui-nucular/main.go
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228
cmd/force-quit-gui-nucular/main.go
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@ -0,0 +1,228 @@
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// force-quit-gui-nucular is a prototype rebuild of force-quit-gui on top of
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// nucular instead of GTK3, to evaluate dropping the GTK runtime dependency.
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//
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// Must be built with `-tags nucular_shiny`. Without that tag nucular
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// defaults to a Gio-based backend that links cgo + EGL/GLES, which defeats
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// the point of the switch; with it, nucular runs on x/exp/shiny's x11driver,
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// which is pure Go with no cgo at all.
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//
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// KNOWN GAP vs. the GTK version: x11driver exposes no iconify/withdraw call,
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// and nucular's OnClose only fires as a cleanup hook after the window
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// manager's close request has already begun tearing the window down — there
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// is no way to intercept delete-and-cancel like GTK's delete-event handler.
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// So, unlike force-quit-gui, clicking the window's close button here exits
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// the process instead of hiding it. Whatever reveals this window (currently
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// swap-watchdog, expecting an always-resident process) would need to relaunch
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// it rather than un-hide it. See TODO below for the planned fix.
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//
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// TODO: investigate extending nucular (or vendoring a thin wrapper around
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// x11driver) to support withdrawing/remapping the X11 window directly via
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// its xgb connection, so close-to-hide can work without pulling in cgo.
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package main
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import (
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"bufio"
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"fmt"
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"image"
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"log"
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"os"
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"path/filepath"
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"sort"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/aarzilli/nucular"
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"github.com/jezek/xgb"
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"github.com/jezek/xgb/xproto"
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)
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// uiScale reads Xft.dpi from the X RESOURCE_MANAGER property (the same value
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// GTK/Qt use to scale HiDPI desktops) and converts it to a nucular style
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// scale factor. nucular's x11driver backend has no HiDPI awareness of its
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// own — without this, text renders at a fixed size regardless of the
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// desktop's configured scale (e.g. KDE's 144 DPI == 1.5x on this machine),
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// which is why the first prototype build looked too small.
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func uiScale() float64 {
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const defaultDPI = 96.0
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conn, err := xgb.NewConn()
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if err != nil {
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return 1.0
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}
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defer conn.Close()
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root := xproto.Setup(conn).DefaultScreen(conn).Root
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reply, err := xproto.GetProperty(conn, false, root, xproto.AtomResourceManager, xproto.AtomString, 0, (1<<32)-1).Reply()
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if err != nil || reply == nil {
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return 1.0
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}
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for _, line := range strings.Split(string(reply.Value), "\n") {
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if name, value, ok := strings.Cut(line, ":"); ok && strings.TrimSpace(name) == "Xft.dpi" {
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if dpi, err := strconv.ParseFloat(strings.TrimSpace(value), 64); err == nil && dpi > 0 {
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return dpi / defaultDPI
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}
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}
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}
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return 1.0
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}
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const refreshInterval = 2 * time.Second
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type procInfo struct {
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pid int
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name string
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rssKB int64
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swapKB int64
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totalKB int64
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}
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func readProcesses() []procInfo {
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entries, err := os.ReadDir("/proc")
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if err != nil {
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return nil
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}
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var procs []procInfo
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for _, e := range entries {
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pid, err := strconv.Atoi(e.Name())
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if err != nil {
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continue
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}
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status, err := os.Open(filepath.Join("/proc", e.Name(), "status"))
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if err != nil {
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continue
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}
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var rss, swap int64
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scanner := bufio.NewScanner(status)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if len(fields) < 2 {
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continue
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}
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switch fields[0] {
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case "VmRSS:":
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rss, _ = strconv.ParseInt(fields[1], 10, 64)
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case "VmSwap:":
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swap, _ = strconv.ParseInt(fields[1], 10, 64)
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}
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}
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status.Close()
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if rss == 0 && swap == 0 {
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continue
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}
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name := e.Name()
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if commBytes, err := os.ReadFile(filepath.Join("/proc", e.Name(), "comm")); err == nil {
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name = strings.TrimSpace(string(commBytes))
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}
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procs = append(procs, procInfo{pid: pid, name: name, rssKB: rss, swapKB: swap, totalKB: rss + swap})
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}
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sort.Slice(procs, func(i, j int) bool { return procs[i].totalKB > procs[j].totalKB })
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return procs
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}
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type appState struct {
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mu sync.Mutex
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procs []procInfo
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selected int // pid, -1 for none
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statusText string
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}
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func (s *appState) refresh() {
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procs := readProcesses()
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s.mu.Lock()
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s.procs = procs
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s.mu.Unlock()
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}
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func main() {
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state := &appState{selected: -1}
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state.refresh()
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var mw nucular.MasterWindow
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update := func(w *nucular.Window) {
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state.mu.Lock()
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procs := state.procs
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selected := state.selected
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statusText := state.statusText
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state.mu.Unlock()
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w.Row(20).Dynamic(1)
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w.Label("Sorted by memory + swap used, highest first. Select a process and force quit it.", "LC")
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// Static() scales its width slice in place, so a shared slice must
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// never be passed via `widths...` to more than one row — each call
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// would compound the previous call's scaling. Pass fresh literals.
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w.Row(22).Static(70, 260, 90, 90, 90)
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w.Label("PID", "LC")
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w.Label("Name", "LC")
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w.Label("RSS (MB)", "LC")
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w.Label("Swap (MB)", "LC")
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w.Label("Total (MB)", "LC")
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for _, p := range procs {
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w.Row(22).Static(70, 260, 90, 90, 90)
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isSelected := p.pid == selected
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wasSelected := isSelected
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w.SelectableLabel(strconv.Itoa(p.pid), "LC", &isSelected)
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if isSelected && !wasSelected {
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state.mu.Lock()
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state.selected = p.pid
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state.mu.Unlock()
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}
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w.Label(p.name, "LC")
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w.Label(fmt.Sprintf("%.1f", float64(p.rssKB)/1024), "LC")
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w.Label(fmt.Sprintf("%.1f", float64(p.swapKB)/1024), "LC")
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w.Label(fmt.Sprintf("%.1f", float64(p.totalKB)/1024), "LC")
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}
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w.Row(20).Dynamic(1)
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w.Label(statusText, "LC")
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w.Row(28).Dynamic(1)
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if w.ButtonText("Force Quit Selected") {
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state.mu.Lock()
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pid := state.selected
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state.mu.Unlock()
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var msg string
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if pid < 0 {
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msg = "No process selected."
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} else if err := syscall.Kill(pid, syscall.SIGKILL); err != nil {
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msg = fmt.Sprintf("Failed to kill PID %d: %v", pid, err)
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} else {
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msg = fmt.Sprintf("Killed PID %d.", pid)
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}
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state.mu.Lock()
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state.statusText = msg
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state.mu.Unlock()
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state.refresh()
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}
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}
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mw = nucular.NewMasterWindowOptions(0, nucular.NewWindowOptions{
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Title: "Force Quit Monitor",
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Size: image.Point{X: 700, Y: 450},
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}, update)
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mw.Style().Scale(uiScale())
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go func() {
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ticker := time.NewTicker(refreshInterval)
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defer ticker.Stop()
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for range ticker.C {
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state.refresh()
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mw.Changed()
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}
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}()
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mw.Main()
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log.Println("force-quit-gui-nucular exiting")
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}
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23
go.mod
23
go.mod
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@ -2,4 +2,25 @@ module github.com/quine-global-labs/swap-watchdog
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go 1.27.1
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require github.com/gotk3/gotk3 v0.6.3 // indirect
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require (
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github.com/aarzilli/nucular v0.0.0-20260922071552-58b808aa5772
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github.com/gotk3/gotk3 v0.6.3
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github.com/jezek/xgb v1.1.1
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)
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require (
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dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b // indirect
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gioui.org v0.10.2 // indirect
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gioui.org/shader v1.0.9 // indirect
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802 // indirect
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20231223183121-56fa3ac82ce7 // indirect
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github.com/go-text/typesetting v0.3.4 // indirect
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github.com/golang/freetype v0.0.0-20161208064710-d9be45aaf745 // indirect
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github.com/hashicorp/golang-lru v0.5.1 // indirect
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golang.org/x/exp/shiny v0.0.0-20250408133849-7e4ce0ab07d0 // indirect
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golang.org/x/image v0.38.0 // indirect
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golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a // indirect
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golang.org/x/net v0.48.0 // indirect
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golang.org/x/sys v0.39.0 // indirect
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golang.org/x/text v0.35.0 // indirect
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)
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41
go.sum
41
go.sum
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@ -1,4 +1,41 @@
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dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b h1:a26Bdkl2B9PmYN6vGXnnfB2UGKjz0Moif1aEg+xTd7M=
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dmitri.shuralyov.com/gpu/mtl v0.0.0-20221208032759-85de2813cf6b/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d h1:ARo7NCVvN2NdhLlJE9xAbKweuI9L6UgfTbYb0YwPacY=
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eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d/go.mod h1:OYVuxibdk9OSLX8vAqydtRPP87PyTFcT9uH3MlEGBQA=
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gioui.org v0.10.2 h1:bZU5CORROwc51sNha0zYdE2qWVaDncOp5EjV5nrZQZ8=
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gioui.org v0.10.2/go.mod h1:iKILKNq6+LHMWhP/HjGDW/wDidUzRnb7B6c7ZD9y1Mg=
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gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
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gioui.org/shader v1.0.9 h1:XxnqIfmClWpN49kizxH2W0JcCFrrEP4q3jZmNYaltbs=
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gioui.org/shader v1.0.9/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802 h1:1BDTz0u9nC3//pOCMdNH+CiXJVYJh5UQNCOBG7jbELc=
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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github.com/aarzilli/nucular v0.0.0-20260922071552-58b808aa5772 h1:wUpmd+1KtaT41+bIa+RJ9WLM3vlfSmKMmpXppkRcDl4=
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github.com/aarzilli/nucular v0.0.0-20260922071552-58b808aa5772/go.mod h1:F2nhfn1CjYcUcl760I0F7+cF8kpgI0k59VuqOCluQ/M=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20231223183121-56fa3ac82ce7 h1:7tf/0aw5DxRQjr7WaNqgtjidub6v21L2cogKIbMcTYw=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20231223183121-56fa3ac82ce7/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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github.com/go-text/typesetting v0.3.4 h1:YYurUOtEb9kGSOz4uE3k4OpBGsp1dDL8+fjCeaFamAU=
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github.com/go-text/typesetting v0.3.4/go.mod h1:4qZCQphq4KSgGTAeI0uMEkVbROgfah8BuyF5LRYr7XY=
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github.com/go-text/typesetting-utils v0.0.0-20260223113751-2d88ac90dae3 h1:drBZzMgdYPbmyXqOto4YhhJGrFIQCX94FpR4MzTCsos=
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github.com/go-text/typesetting-utils v0.0.0-20260223113751-2d88ac90dae3/go.mod h1:3/62I4La/HBRX9TcTpBj4eipLiwzf+vhI+7whTc9V7o=
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github.com/golang/freetype v0.0.0-20161208064710-d9be45aaf745 h1:0d9whnMsm0iklqvoBXNEgHPt8pkXdfDplBAswA/F8YA=
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github.com/golang/freetype v0.0.0-20161208064710-d9be45aaf745/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
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github.com/gotk3/gotk3 v0.6.3 h1:+Ke4WkM1TQUNOlM2TZH6szqknqo+zNbX3BZWVXjSHYw=
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github.com/gotk3/gotk3 v0.6.3/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
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github.com/gotk3/gotk3 v0.6.4 h1:5ur/PRr86PwCG8eSj98D1eXvhrNNK6GILS2zq779dCg=
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github.com/gotk3/gotk3 v0.6.4/go.mod h1:/hqFpkNa9T3JgNAE2fLvCdov7c5bw//FHNZrZ3Uv9/Q=
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github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+dAcgU=
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github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
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github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
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github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
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golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0 h1:R84qjqJb5nVJMxqWYb3np9L5ZsaDtB+a39EqjV0JSUM=
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golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0/go.mod h1:S9Xr4PYopiDyqSyp5NjCrhFrqg6A5zA2E/iPHPhqnS8=
|
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golang.org/x/exp/shiny v0.0.0-20250408133849-7e4ce0ab07d0 h1:tMSqXTK+AQdW3LpCbfatHSRPHeW6+2WuxaVQuHftn80=
|
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golang.org/x/exp/shiny v0.0.0-20250408133849-7e4ce0ab07d0/go.mod h1:ygj7T6vSGhhm/9yTpOQQNvuAUFziTH7RUiH74EoE2C8=
|
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golang.org/x/image v0.38.0 h1:5l+q+Y9JDC7mBOMjo4/aPhMDcxEptsX+Tt3GgRQRPuE=
|
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golang.org/x/image v0.38.0/go.mod h1:/3f6vaXC+6CEanU4KJxbcUZyEePbyKbaLoDOe4ehFYY=
|
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golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a h1:sYbmY3FwUWCBTodZL1S3JUuOvaW6kM2o+clDzzDNBWg=
|
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golang.org/x/mobile v0.0.0-20231127183840-76ac6878050a/go.mod h1:Ede7gF0KGoHlj822RtphAHK1jLdrcuRBZg0sF1Q+SPc=
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golang.org/x/net v0.48.0 h1:zyQRTTrjc33Lhh0fBgT/H3oZq9WuvRR5gPC70xpDiQU=
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golang.org/x/net v0.48.0/go.mod h1:+ndRgGjkh8FGtu1w1FGbEC31if4VrNVMuKTgcAAnQRY=
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golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=
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golang.org/x/sys v0.39.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
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golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
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golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
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|
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