hpcu: the slightest cleanup
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parent
f99615c850
commit
056391eeca
GPG Key ID:
A0420B94F92B9493
330
hpcu/main.go
330
hpcu/main.go
@ -133,180 +133,194 @@ func requestOwnership(origin *selectionState, time xproto.Timestamp) {
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}
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}
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func handleEvent(ev nexgb.Event) {
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switch e := ev.(type) {
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case xfixes.SelectionNotifyEvent:
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state, ok := selections[e.Selection]
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if !ok {
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break
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}
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func handleXfixesSelectionNotify(e xfixes.SelectionNotifyEvent) {
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state, ok := selections[e.Selection]
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if !ok {
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return
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}
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// Ownership request has been granted, don't ask ourselves for data.
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if e.Owner == wid {
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state.owning = e.SelectionTimestamp
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break
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}
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// Ownership request has been granted, don't ask ourselves for data.
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if e.Owner == wid {
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state.owning = e.SelectionTimestamp
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return
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}
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// This should always be true.
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if state.owning < e.SelectionTimestamp {
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state.owning = 0
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}
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// This should always be true.
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if state.owning < e.SelectionTimestamp {
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state.owning = 0
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}
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// Not checking whether we should give up when our current retrieval
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// attempt is interrupted--the timeout mostly solves this.
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if e.Owner == xproto.WindowNone {
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break
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}
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// Not checking whether we should give up when our current retrieval
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// attempt is interrupted--the timeout mostly solves this.
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if e.Owner == xproto.WindowNone {
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return
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}
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// Don't try to process two things at once. Each request gets a few
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// seconds to finish, then we move on, hoping that a property race
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// doesn't commence. Ideally we'd set up a separate queue for these
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// skipped requests and process them later.
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if state.inProgress != 0 && e.Timestamp-state.inProgress < 5000 {
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break
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}
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// Don't try to process two things at once. Each request gets a few
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// seconds to finish, then we move on, hoping that a property race
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// doesn't commence. Ideally we'd set up a separate queue for these
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// skipped requests and process them later.
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if state.inProgress != 0 && e.Timestamp-state.inProgress < 5000 {
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return
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}
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// ICCCM says we should ensure the named property doesn't exist.
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_ = xproto.DeleteProperty(X, e.Window, e.Selection)
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// ICCCM says we should ensure the named property doesn't exist.
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_ = xproto.DeleteProperty(X, e.Window, e.Selection)
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_ = xproto.ConvertSelection(X, e.Window, e.Selection,
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atomUTF8String, e.Selection, e.Timestamp)
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_ = xproto.ConvertSelection(X, e.Window, e.Selection,
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atomUTF8String, e.Selection, e.Timestamp)
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state.inProgress = e.Timestamp
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state.incr = false
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state.inProgress = e.Timestamp
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state.incr = false
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}
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case xproto.SelectionNotifyEvent:
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state, ok := selections[e.Selection]
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if e.Requestor != wid || !ok || e.Time != state.inProgress {
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break
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}
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func handleSelectionNotify(e xproto.SelectionNotifyEvent) {
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state, ok := selections[e.Selection]
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if e.Requestor != wid || !ok || e.Time != state.inProgress {
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return
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}
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state.inProgress = 0
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if e.Property == xproto.AtomNone {
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break
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}
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state.inProgress = 0
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if e.Property == xproto.AtomNone {
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return
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}
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state.buffer = nil
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reply, err := getProperty(e.Requestor, e.Property)
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if err != nil {
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break
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}
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state.buffer = nil
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reply, err := getProperty(e.Requestor, e.Property)
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if err != nil {
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return
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}
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// When you select a lot of text in VIM, it starts the ICCCM
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// INCR mechanism, from which there is no opt-out.
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if reply.Type == atomINCR {
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state.inProgress = e.Time
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state.incr = true
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state.incrFailed = false
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} else if appendText(state, reply) {
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// When you select a lot of text in VIM, it starts the ICCCM
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// INCR mechanism, from which there is no opt-out.
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if reply.Type == atomINCR {
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state.inProgress = e.Time
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state.incr = true
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state.incrFailed = false
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} else if appendText(state, reply) {
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requestOwnership(state, e.Time)
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}
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_ = xproto.DeleteProperty(X, e.Requestor, e.Property)
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}
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func handlePropertyNotify(e xproto.PropertyNotifyEvent) {
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state, ok := selections[e.Atom]
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if e.Window != wid || e.State != xproto.PropertyNewValue ||
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!ok || !state.incr {
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return
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}
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reply, err := getProperty(e.Window, e.Atom)
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if err != nil {
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state.incrFailed = true
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return
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}
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if !appendText(state, reply) {
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// We need to keep deleting the property.
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state.incrFailed = true
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}
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if reply.ValueLen == 0 {
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if !state.incrFailed {
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requestOwnership(state, e.Time)
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}
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state.inProgress = 0
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state.incr = false
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}
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_ = xproto.DeleteProperty(X, e.Requestor, e.Property)
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_ = xproto.DeleteProperty(X, e.Window, e.Atom)
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}
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func handleSelectionRequest(e xproto.SelectionRequestEvent) {
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property := e.Property
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if property == xproto.AtomNone {
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property = e.Target
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}
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state, ok := selections[e.Selection]
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if e.Owner != wid || !ok {
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return
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}
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var (
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typ xproto.Atom
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format byte
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data []byte
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)
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// XXX: We should also support the MULTIPLE target but it seems to be
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// unimportant and largely abandoned today.
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targets := []xproto.Atom{atomTARGETS, atomTIMESTAMP, atomUTF8String}
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switch e.Target {
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case atomTARGETS:
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typ = xproto.AtomAtom
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format = 32
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data = make([]byte, len(targets)*4)
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for i, atom := range targets {
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nexgb.Put32(data[i*4:], uint32(atom))
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}
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case atomTIMESTAMP:
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typ = xproto.AtomInteger
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format = 32
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data = make([]byte, 4)
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nexgb.Put32(data, uint32(state.owning))
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case atomUTF8String:
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typ = atomUTF8String
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format = 8
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data = []byte(contents)
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}
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response := xproto.SelectionNotifyEvent{
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Time: e.Time,
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Requestor: e.Requestor,
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Selection: e.Selection,
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Target: e.Target,
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Property: xproto.AtomNone,
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}
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if typ == 0 || len(data) > int(setup.MaximumRequestLength)*4-64 ||
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state.owning == 0 || e.Time < state.owning {
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// TODO: Use the INCR mechanism for large data transfers instead
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// of refusing the request, or at least use PropModeAppend.
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//
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// According to the ICCCM we need to set up a queue for concurrent
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// (requestor, selection, target, timestamp) requests that differ
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// only in the target property, and process them in order. The ICCCM
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// has a nice rationale. It seems to only concern INCR. The queue
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// might be a map[(who, what, how, when)][](where, data, offset).
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//
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// NOTE: Even with BigRequests support, it may technically be
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// missing on the particular X server, and XGB copies buffers to yet
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// another buffer, making very large transfers a very bad idea.
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} else if xproto.ChangePropertyChecked(X, xproto.PropModeReplace,
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e.Requestor, property, typ, format,
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uint32(len(data)/int(format/8)), data).Check() == nil {
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response.Property = property
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}
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_ = xproto.SendEvent(X, false /* propagate */, e.Requestor,
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0 /* event mask */, string(response.Bytes()))
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}
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func handleXEvent(ev nexgb.Event) {
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switch e := ev.(type) {
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case xfixes.SelectionNotifyEvent:
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handleXfixesSelectionNotify(e)
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case xproto.SelectionNotifyEvent:
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handleSelectionNotify(e)
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case xproto.PropertyNotifyEvent:
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state, ok := selections[e.Atom]
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if e.Window != wid || e.State != xproto.PropertyNewValue ||
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!ok || !state.incr {
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break
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}
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reply, err := getProperty(e.Window, e.Atom)
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if err != nil {
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state.incrFailed = true
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break
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}
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if !appendText(state, reply) {
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// We need to keep deleting the property.
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state.incrFailed = true
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}
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if reply.ValueLen == 0 {
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if !state.incrFailed {
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requestOwnership(state, e.Time)
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}
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state.inProgress = 0
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state.incr = false
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}
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_ = xproto.DeleteProperty(X, e.Window, e.Atom)
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handlePropertyNotify(e)
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case xproto.SelectionRequestEvent:
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property := e.Property
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if property == xproto.AtomNone {
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property = e.Target
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}
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state, ok := selections[e.Selection]
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if e.Owner != wid || !ok {
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break
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}
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var (
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typ xproto.Atom
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format byte
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data []byte
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)
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// XXX: We should also support the MULTIPLE target but it seems to be
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// unimportant and largely abandoned today.
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targets := []xproto.Atom{atomTARGETS, atomTIMESTAMP, atomUTF8String}
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switch e.Target {
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case atomTARGETS:
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typ = xproto.AtomAtom
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format = 32
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data = make([]byte, len(targets)*4)
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for i, atom := range targets {
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nexgb.Put32(data[i*4:], uint32(atom))
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}
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case atomTIMESTAMP:
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typ = xproto.AtomInteger
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format = 32
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data = make([]byte, 4)
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nexgb.Put32(data, uint32(state.owning))
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case atomUTF8String:
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typ = atomUTF8String
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format = 8
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data = []byte(contents)
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}
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response := xproto.SelectionNotifyEvent{
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Time: e.Time,
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Requestor: e.Requestor,
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Selection: e.Selection,
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Target: e.Target,
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Property: xproto.AtomNone,
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}
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if typ == 0 || len(data) > int(setup.MaximumRequestLength)*4-64 ||
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state.owning == 0 || e.Time < state.owning {
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// TODO: Use the INCR mechanism for large data transfers instead
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// of refusing the request, or at least use PropModeAppend.
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//
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// According to the ICCCM we need to set up a queue for concurrent
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// (requestor, selection, target, timestamp) requests that differ
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// only in the target property, and process them in order. The ICCCM
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// has a nice rationale. It seems to only concern INCR. The queue
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// might be a map[(who, what, how, when)][](where, data, offset).
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//
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// NOTE: Even with BigRequests support, it may technically be
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// missing on the particular X server, and XGB copies buffers to yet
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// another buffer, making very large transfers a very bad idea.
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} else if xproto.ChangePropertyChecked(X, xproto.PropModeReplace,
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e.Requestor, property, typ, format,
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uint32(len(data)/int(format/8)), data).Check() == nil {
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response.Property = property
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}
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_ = xproto.SendEvent(X, false /* propagate */, e.Requestor,
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0 /* event mask */, string(response.Bytes()))
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handleSelectionRequest(e)
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}
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}
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@ -345,7 +359,7 @@ func main() {
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return
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}
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if ev != nil {
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handleEvent(ev)
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handleXEvent(ev)
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}
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}
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}
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