aboutsummaryrefslogtreecommitdiffstats
path: root/app/aerc.go
blob: 7418e979d40c1216610f0ea55984251994676ca6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
package app

import (
	"errors"
	"fmt"
	"io"
	"net/url"
	"os/exec"
	"sort"
	"strings"
	"time"
	"unicode"

	"git.sr.ht/~rjarry/go-opt"
	"git.sr.ht/~rockorager/vaxis"
	"github.com/ProtonMail/go-crypto/openpgp"
	"github.com/emersion/go-message/mail"

	"git.sr.ht/~rjarry/aerc/config"
	"git.sr.ht/~rjarry/aerc/lib"
	"git.sr.ht/~rjarry/aerc/lib/crypto"
	"git.sr.ht/~rjarry/aerc/lib/log"
	"git.sr.ht/~rjarry/aerc/lib/ui"
	"git.sr.ht/~rjarry/aerc/models"
	"git.sr.ht/~rjarry/aerc/worker/types"
)

type Aerc struct {
	accounts    map[string]*AccountView
	cmd         func(string, *config.AccountConfig, *models.MessageInfo) error
	cmdHistory  lib.History
	complete    func(cmd string) ([]string, string)
	focused     ui.Interactive
	grid        *ui.Grid
	simulating  int
	statusbar   *ui.Stack
	statusline  *StatusLine
	pasting     bool
	pendingKeys []config.KeyStroke
	prompts     *ui.Stack
	tabs        *ui.Tabs
	beep        func() error
	dialog      ui.DrawableInteractive

	Crypto crypto.Provider
}

type Choice struct {
	Key     string
	Text    string
	Command string
}

func (aerc *Aerc) Init(
	crypto crypto.Provider,
	cmd func(string, *config.AccountConfig, *models.MessageInfo) error,
	complete func(cmd string) ([]string, string), cmdHistory lib.History,
	deferLoop chan struct{},
) {
	tabs := ui.NewTabs(config.Ui)

	statusbar := ui.NewStack(config.Ui)
	statusline := &StatusLine{}
	statusbar.Push(statusline)

	grid := ui.NewGrid().Rows([]ui.GridSpec{
		{Strategy: ui.SIZE_EXACT, Size: ui.Const(1)},
		{Strategy: ui.SIZE_WEIGHT, Size: ui.Const(1)},
		{Strategy: ui.SIZE_EXACT, Size: ui.Const(1)},
	}).Columns([]ui.GridSpec{
		{Strategy: ui.SIZE_WEIGHT, Size: ui.Const(1)},
	})
	grid.AddChild(tabs.TabStrip)
	grid.AddChild(tabs.TabContent).At(1, 0)
	grid.AddChild(statusbar).At(2, 0)

	aerc.accounts = make(map[string]*AccountView)
	aerc.cmd = cmd
	aerc.cmdHistory = cmdHistory
	aerc.complete = complete
	aerc.grid = grid
	aerc.statusbar = statusbar
	aerc.statusline = statusline
	aerc.prompts = ui.NewStack(config.Ui)
	aerc.tabs = tabs
	aerc.Crypto = crypto

	for _, acct := range config.Accounts {
		view, err := NewAccountView(acct, deferLoop)
		if err != nil {
			tabs.Add(errorScreen(err.Error()), acct.Name, nil)
		} else {
			aerc.accounts[acct.Name] = view
			view.tab = tabs.Add(view, acct.Name, view.UiConfig())
		}
	}

	if len(config.Accounts) == 0 {
		wizard := NewAccountWizard()
		wizard.Focus(true)
		aerc.NewTab(wizard, "New account")
	}

	tabs.Select(0)

	tabs.CloseTab = func(index int) {
		tab := aerc.tabs.Get(index)
		if tab == nil {
			return
		}
		switch content := tab.Content.(type) {
		case *AccountView:
			return
		case *AccountWizard:
			return
		default:
			aerc.RemoveTab(content, true)
		}
	}

	aerc.showConfigWarnings()
}

func (aerc *Aerc) showConfigWarnings() {
	var dialogs []ui.DrawableInteractive

	callback := func(string, error) {
		aerc.CloseDialog()
		if len(dialogs) > 0 {
			d := dialogs[0]
			dialogs = dialogs[1:]
			aerc.AddDialog(d)
		}
	}

	for _, w := range config.Warnings {
		dialogs = append(dialogs, NewSelectorDialog(
			w.Title, w.Body, []string{"OK"}, 0,
			aerc.SelectedAccountUiConfig(),
			callback,
		))
	}

	callback("", nil)
}

func (aerc *Aerc) OnBeep(f func() error) {
	aerc.beep = f
}

func (aerc *Aerc) Beep() {
	if aerc.beep == nil {
		log.Warnf("should beep, but no beeper")
		return
	}
	if err := aerc.beep(); err != nil {
		log.Errorf("tried to beep, but could not: %v", err)
	}
}

func (aerc *Aerc) HandleMessage(msg types.WorkerMessage) {
	if acct, ok := aerc.accounts[msg.Account()]; ok {
		acct.onMessage(msg)
	}
}

func (aerc *Aerc) Invalidate() {
	ui.Invalidate()
}

func (aerc *Aerc) Focus(focus bool) {
	// who cares
}

func (aerc *Aerc) Draw(ctx *ui.Context) {
	if len(aerc.prompts.Children()) > 0 {
		previous := aerc.focused
		prompt := aerc.prompts.Pop().(*ExLine)
		prompt.finish = func() {
			aerc.statusbar.Pop()
			aerc.focus(previous)
		}

		aerc.statusbar.Push(prompt)
		aerc.focus(prompt)
	}
	aerc.grid.Draw(ctx)
	if aerc.dialog != nil {
		if w, h := ctx.Width(), ctx.Height(); w > 8 && h > 4 {
			if d, ok := aerc.dialog.(Dialog); ok {
				xstart, width := d.ContextWidth()
				ystart, height := d.ContextHeight()
				aerc.dialog.Draw(
					ctx.Subcontext(xstart(w), ystart(h),
						width(w), height(h)))
			} else {
				aerc.dialog.Draw(ctx.Subcontext(4, h/2-2, w-8, 4))
			}
		}
	}
}

func (aerc *Aerc) HumanReadableBindings() []string {
	var result []string
	binds := aerc.getBindings()
	format := func(s string) string {
		return strings.ReplaceAll(s, "%", "%%")
	}
	annotate := func(b *config.Binding) string {
		if b.Annotation == "" {
			return ""
		}
		return "[" + b.Annotation + "]"
	}
	fmtStr := "%10s %s %s"
	for _, bind := range binds.Bindings {
		result = append(result, fmt.Sprintf(fmtStr,
			format(config.FormatKeyStrokes(bind.Input)),
			format(config.FormatKeyStrokes(bind.Output)),
			annotate(bind),
		))
	}
	if binds.Globals && config.Binds.Global != nil {
		for _, bind := range config.Binds.Global.Bindings {
			result = append(result, fmt.Sprintf(fmtStr+" (Globals)",
				format(config.FormatKeyStrokes(bind.Input)),
				format(config.FormatKeyStrokes(bind.Output)),
				annotate(bind),
			))
		}
	}
	result = append(result, fmt.Sprintf(fmtStr,
		"$ex",
		fmt.Sprintf("'%c'", binds.ExKey.Key), "",
	))
	result = append(result, fmt.Sprintf(fmtStr,
		"Globals",
		fmt.Sprintf("%v", binds.Globals), "",
	))
	sort.Strings(result)
	return result
}

func (aerc *Aerc) getBindings() *config.KeyBindings {
	selectedAccountName := ""
	if aerc.SelectedAccount() != nil {
		selectedAccountName = aerc.SelectedAccount().acct.Name
	}
	switch view := aerc.SelectedTabContent().(type) {
	case *AccountView:
		binds := config.Binds.MessageList.ForAccount(selectedAccountName)
		return binds.ForFolder(view.SelectedDirectory())
	case *AccountWizard:
		return config.Binds.AccountWizard
	case *Composer:
		var binds *config.KeyBindings
		switch view.Bindings() {
		case "compose::editor":
			binds = config.Binds.ComposeEditor.ForAccount(
				selectedAccountName)
		case "compose::review":
			binds = config.Binds.ComposeReview.ForAccount(
				selectedAccountName)
		default:
			binds = config.Binds.Compose.ForAccount(
				selectedAccountName)
		}
		return binds.ForFolder(view.SelectedDirectory())
	case *MessageViewer:
		switch view.Bindings() {
		case "view::passthrough":
			return config.Binds.MessageViewPassthrough.ForAccount(
				selectedAccountName)
		default:
			return config.Binds.MessageView.ForAccount(
				selectedAccountName)
		}
	case *Terminal:
		return config.Binds.Terminal
	default:
		return config.Binds.Global
	}
}

func (aerc *Aerc) simulate(strokes []config.KeyStroke) {
	aerc.pendingKeys = []config.KeyStroke{}
	bindings := aerc.getBindings()
	complete := aerc.SelectedAccountUiConfig().CompletionMinChars != config.MANUAL_COMPLETE
	aerc.simulating += 1

	for _, stroke := range strokes {
		simulated := vaxis.Key{
			Keycode:   stroke.Key,
			Modifiers: stroke.Modifiers,
		}
		if unicode.IsUpper(stroke.Key) {
			simulated.Keycode = unicode.ToLower(stroke.Key)
			simulated.Modifiers |= vaxis.ModShift
		}
		// If none of these mods are present, set the text field to
		// enable matching keys like ":"
		if stroke.Modifiers&vaxis.ModCtrl == 0 &&
			stroke.Modifiers&vaxis.ModAlt == 0 &&
			stroke.Modifiers&vaxis.ModSuper == 0 &&
			stroke.Modifiers&vaxis.ModHyper == 0 {

			simulated.Text = string(stroke.Key)
		}
		aerc.Event(simulated)
		complete = stroke == bindings.CompleteKey
	}
	aerc.simulating -= 1
	if exline, ok := aerc.focused.(*ExLine); ok {
		// we are still focused on the exline, turn on tab complete
		exline.TabComplete(func(cmd string) ([]string, string) {
			return aerc.complete(cmd)
		})
		if complete {
			// force completion now
			exline.Event(vaxis.Key{Keycode: vaxis.KeyTab})
		}
	}
}

func (aerc *Aerc) Event(event vaxis.Event) bool {
	if aerc.dialog != nil {
		return aerc.dialog.Event(event)
	}

	if aerc.focused != nil {
		return aerc.focused.Event(event)
	}

	switch event := event.(type) {
	// TODO: more vaxis events handling
	case vaxis.Key:
		// If we are in a bracketed paste, don't process the keys for
		// bindings
		if aerc.pasting {
			interactive, ok := aerc.SelectedTabContent().(ui.Interactive)
			if ok {
				return interactive.Event(event)
			}
			return false
		}
		aerc.statusline.Expire()
		stroke := config.KeyStroke{
			Modifiers: event.Modifiers,
		}
		switch {
		case event.ShiftedCode != 0:
			stroke.Key = event.ShiftedCode
			stroke.Modifiers &^= vaxis.ModShift
		default:
			stroke.Key = event.Keycode
		}
		aerc.pendingKeys = append(aerc.pendingKeys, stroke)
		ui.Invalidate()
		bindings := aerc.getBindings()
		incomplete := false
		result, strokes := bindings.GetBinding(aerc.pendingKeys)
		switch result {
		case config.BINDING_FOUND:
			aerc.simulate(strokes)
			return true
		case config.BINDING_INCOMPLETE:
			incomplete = true
		case config.BINDING_NOT_FOUND:
		}
		if bindings.Globals {
			result, strokes = config.Binds.Global.GetBinding(aerc.pendingKeys)
			switch result {
			case config.BINDING_FOUND:
				aerc.simulate(strokes)
				return true
			case config.BINDING_INCOMPLETE:
				incomplete = true
			case config.BINDING_NOT_FOUND:
			}
		}
		if !incomplete {
			aerc.pendingKeys = []config.KeyStroke{}
			exKey := bindings.ExKey
			if aerc.simulating > 0 {
				// Keybindings still use : even if you change the ex key
				exKey = config.Binds.Global.ExKey
			}
			if aerc.isExKey(event, exKey) {
				aerc.BeginExCommand("")
				return true
			}
			interactive, ok := aerc.SelectedTabContent().(ui.Interactive)
			if ok {
				return interactive.Event(event)
			}
			return false
		}
	case vaxis.Mouse:
		aerc.grid.MouseEvent(event.Col, event.Row, event)
		return true
	case vaxis.PasteStartEvent:
		aerc.pasting = true
		interactive, ok := aerc.SelectedTabContent().(ui.Interactive)
		if ok {
			return interactive.Event(event)
		}
		return false
	case vaxis.PasteEndEvent:
		aerc.pasting = false
		interactive, ok := aerc.SelectedTabContent().(ui.Interactive)
		if ok {
			return interactive.Event(event)
		}
		return false
	}
	return false
}

func (aerc *Aerc) SelectedAccount() *AccountView {
	return aerc.account(aerc.SelectedTabContent())
}

func (aerc *Aerc) Account(name string) (*AccountView, error) {
	if acct, ok := aerc.accounts[name]; ok {
		return acct, nil
	}
	return nil, fmt.Errorf("account <%s> not found", name)
}

func (aerc *Aerc) PrevAccount() (*AccountView, error) {
	cur := aerc.SelectedAccount()
	if cur == nil {
		return nil, fmt.Errorf("no account selected, cannot get prev")
	}
	for i, conf := range config.Accounts {
		if conf.Name == cur.Name() {
			i -= 1
			if i == -1 {
				i = len(config.Accounts) - 1
			}
			conf = config.Accounts[i]
			return aerc.Account(conf.Name)
		}
	}
	return nil, fmt.Errorf("no prev account")
}

func (aerc *Aerc) NextAccount() (*AccountView, error) {
	cur := aerc.SelectedAccount()
	if cur == nil {
		return nil, fmt.Errorf("no account selected, cannot get next")
	}
	for i, conf := range config.Accounts {
		if conf.Name == cur.Name() {
			i += 1
			if i == len(config.Accounts) {
				i = 0
			}
			conf = config.Accounts[i]
			return aerc.Account(conf.Name)
		}
	}
	return nil, fmt.Errorf("no next account")
}

func (aerc *Aerc) AccountNames() []string {
	results := make([]string, 0)
	for name := range aerc.accounts {
		results = append(results, name)
	}
	return results
}

func (aerc *Aerc) account(d ui.Drawable) *AccountView {
	switch tab := d.(type) {
	case *AccountView:
		return tab
	case *MessageViewer:
		return tab.SelectedAccount()
	case *Composer:
		return tab.Account()
	}
	return nil
}

func (aerc *Aerc) SelectedAccountUiConfig() *config.UIConfig {
	acct := aerc.SelectedAccount()
	if acct == nil {
		return config.Ui
	}
	return acct.UiConfig()
}

func (aerc *Aerc) SelectedTabContent() ui.Drawable {
	tab := aerc.tabs.Selected()
	if tab == nil {
		return nil
	}
	return tab.Content
}

func (aerc *Aerc) SelectedTab() *ui.Tab {
	return aerc.tabs.Selected()
}

func (aerc *Aerc) NewTab(clickable ui.Drawable, name string) *ui.Tab {
	uiConf := config.Ui
	if acct := aerc.account(clickable); acct != nil {
		uiConf = acct.UiConfig()
	}
	tab := aerc.tabs.Add(clickable, name, uiConf)
	aerc.UpdateStatus()
	return tab
}

func (aerc *Aerc) RemoveTab(tab ui.Drawable, closeContent bool) {
	aerc.tabs.Remove(tab)
	aerc.UpdateStatus()
	if content, ok := tab.(ui.Closeable); ok && closeContent {
		content.Close()
	}
}

func (aerc *Aerc) ReplaceTab(tabSrc ui.Drawable, tabTarget ui.Drawable, name string, closeSrc bool) {
	aerc.tabs.Replace(tabSrc, tabTarget, name)
	if content, ok := tabSrc.(ui.Closeable); ok && closeSrc {
		content.Close()
	}
}

func (aerc *Aerc) MoveTab(i int, relative bool) {
	aerc.tabs.MoveTab(i, relative)
}

func (aerc *Aerc) PinTab() {
	aerc.tabs.PinTab()
}

func (aerc *Aerc) UnpinTab() {
	aerc.tabs.UnpinTab()
}

func (aerc *Aerc) NextTab() {
	aerc.tabs.NextTab()
}

func (aerc *Aerc) PrevTab() {
	aerc.tabs.PrevTab()
}

func (aerc *Aerc) SelectTab(name string) bool {
	ok := aerc.tabs.SelectName(name)
	if ok {
		aerc.UpdateStatus()
	}
	return ok
}

func (aerc *Aerc) SelectTabIndex(index int) bool {
	ok := aerc.tabs.Select(index)
	if ok {
		aerc.UpdateStatus()
	}
	return ok
}

func (aerc *Aerc) SelectTabAtOffset(offset int) {
	aerc.tabs.SelectOffset(offset)
}

func (aerc *Aerc) TabNames() []string {
	return aerc.tabs.Names()
}

func (aerc *Aerc) SelectPreviousTab() bool {
	return aerc.tabs.SelectPrevious()
}

func (aerc *Aerc) UpdateStatus() {
	if acct := aerc.SelectedAccount(); acct != nil {
		aerc.statusline.Update(acct)
	} else {
		aerc.statusline.Clear()
	}
}

func (aerc *Aerc) SetError(err string) {
	aerc.statusline.SetError(err)
}

func (aerc *Aerc) PushStatus(text string, expiry time.Duration) *StatusMessage {
	return aerc.statusline.Push(text, expiry)
}

func (aerc *Aerc) PushError(text string) *StatusMessage {
	return aerc.statusline.PushError(text)
}

func (aerc *Aerc) PushWarning(text string) *StatusMessage {
	return aerc.statusline.PushWarning(text)
}

func (aerc *Aerc) PushSuccess(text string) *StatusMessage {
	return aerc.statusline.PushSuccess(text)
}

func (aerc *Aerc) focus(item ui.Interactive) {
	if aerc.focused == item {
		return
	}
	if aerc.focused != nil {
		aerc.focused.Focus(false)
	}
	aerc.focused = item
	interactive, ok := aerc.SelectedTabContent().(ui.Interactive)
	if item != nil {
		item.Focus(true)
		if ok {
			interactive.Focus(false)
		}
	} else if ok {
		interactive.Focus(true)
	}
}

func (aerc *Aerc) BeginExCommand(cmd string) {
	previous := aerc.focused
	var tabComplete func(string) ([]string, string)
	if aerc.simulating != 0 {
		// Don't try to draw completions for simulated events
		tabComplete = nil
	} else {
		tabComplete = func(cmd string) ([]string, string) {
			return aerc.complete(cmd)
		}
	}
	exline := NewExLine(cmd, func(cmd string) {
		err := aerc.cmd(cmd, nil, nil)
		if err != nil {
			aerc.PushError(err.Error())
		}
		// only add to history if this is an unsimulated command,
		// ie one not executed from a keybinding
		if aerc.simulating == 0 {
			aerc.cmdHistory.Add(cmd)
		}
	}, func() {
		aerc.statusbar.Pop()
		aerc.focus(previous)
	}, tabComplete, aerc.cmdHistory)
	aerc.statusbar.Push(exline)
	aerc.focus(exline)
}

func (aerc *Aerc) PushPrompt(prompt *ExLine) {
	aerc.prompts.Push(prompt)
}

func (aerc *Aerc) RegisterPrompt(prompt string, cmd string) {
	p := NewPrompt(prompt, func(text string) {
		if text != "" {
			cmd += " " + opt.QuoteArg(text)
		}
		err := aerc.cmd(cmd, nil, nil)
		if err != nil {
			aerc.PushError(err.Error())
		}
	}, func(cmd string) ([]string, string) {
		return nil, "" // TODO: completions
	})
	aerc.prompts.Push(p)
}

func (aerc *Aerc) RegisterChoices(choices []Choice) {
	cmds := make(map[string]string)
	texts := []string{}
	for _, c := range choices {
		text := fmt.Sprintf("[%s] %s", c.Key, c.Text)
		if strings.Contains(c.Text, c.Key) {
			text = strings.Replace(c.Text, c.Key, "["+c.Key+"]", 1)
		}
		texts = append(texts, text)
		cmds[c.Key] = c.Command
	}
	prompt := strings.Join(texts, ", ") + "? "
	p := NewPrompt(prompt, func(text string) {
		cmd, ok := cmds[text]
		if !ok {
			return
		}
		err := aerc.cmd(cmd, nil, nil)
		if err != nil {
			aerc.PushError(err.Error())
		}
	}, func(cmd string) ([]string, string) {
		return nil, "" // TODO: completions
	})
	aerc.prompts.Push(p)
}

func (aerc *Aerc) Mailto(addr *url.URL) error {
	var subject string
	var body string
	var acctName string
	var attachments []string
	h := &mail.Header{}
	to, err := mail.ParseAddressList(addr.Opaque)
	if err != nil && addr.Opaque != "" {
		return fmt.Errorf("Could not parse to: %w", err)
	}
	h.SetAddressList("to", to)
	template := config.Templates.NewMessage
	for key, vals := range addr.Query() {
		switch strings.ToLower(key) {
		case "account":
			acctName = strings.Join(vals, "")
		case "bcc":
			list, err := mail.ParseAddressList(strings.Join(vals, ","))
			if err != nil {
				break
			}
			h.SetAddressList("Bcc", list)
		case "body":
			body = strings.Join(vals, "\n")
		case "cc":
			list, err := mail.ParseAddressList(strings.Join(vals, ","))
			if err != nil {
				break
			}
			h.SetAddressList("Cc", list)
		case "in-reply-to":
			for i, msgID := range vals {
				if len(msgID) > 1 && msgID[0] == '<' &&
					msgID[len(msgID)-1] == '>' {
					vals[i] = msgID[1 : len(msgID)-1]
				}
			}
			h.SetMsgIDList("In-Reply-To", vals)
		case "subject":
			subject = strings.Join(vals, ",")
			h.SetText("Subject", subject)
		case "template":
			template = strings.Join(vals, "")
			log.Tracef("template set to %s", template)
		case "attach":
			for _, path := range vals {
				// remove a potential file:// prefix.
				attachments = append(attachments, strings.TrimPrefix(path, "file://"))
			}
		default:
			// any other header gets ignored on purpose to avoid control headers
			// being injected
		}
	}

	acct := aerc.SelectedAccount()
	if acctName != "" {
		if a, ok := aerc.accounts[acctName]; ok && a != nil {
			acct = a
		}
	}

	if acct == nil {
		return errors.New("No account selected")
	}

	defer ui.Invalidate()

	composer, err := NewComposer(acct,
		acct.AccountConfig(), acct.Worker(),
		config.Compose.EditHeaders, template, h, nil,
		strings.NewReader(body))
	if err != nil {
		return err
	}
	composer.FocusEditor("subject")
	title := "New email"
	if subject != "" {
		title = subject
		composer.FocusTerminal()
	}
	if to == nil {
		composer.FocusEditor("to")
	}
	composer.Tab = aerc.NewTab(composer, title)

	for _, file := range attachments {
		composer.AddAttachment(file)
	}
	return nil
}

func (aerc *Aerc) Mbox(source string) error {
	acctConf := config.AccountConfig{}
	if selectedAcct := aerc.SelectedAccount(); selectedAcct != nil {
		acctConf = *selectedAcct.acct
		info := fmt.Sprintf("Loading outgoing mbox mail settings from account [%s]", selectedAcct.Name())
		aerc.PushStatus(info, 10*time.Second)
		log.Debugf(info)
	} else {
		acctConf.From = &mail.Address{Address: "user@localhost"}
	}
	acctConf.Name = "mbox"
	acctConf.Source = source
	acctConf.Default = "INBOX"
	acctConf.Archive = "Archive"
	acctConf.Postpone = "Drafts"
	acctConf.CopyTo = "Sent"

	defer ui.Invalidate()

	mboxView, err := NewAccountView(&acctConf, nil)
	if err != nil {
		aerc.NewTab(errorScreen(err.Error()), acctConf.Name)
	} else {
		aerc.accounts[acctConf.Name] = mboxView
		aerc.NewTab(mboxView, acctConf.Name)
	}
	return nil
}

func (aerc *Aerc) Command(cmd string) error {
	defer ui.Invalidate()
	return aerc.cmd(cmd, nil, nil)
}

func (aerc *Aerc) CloseBackends() error {
	var returnErr error
	for _, acct := range aerc.accounts {
		var raw interface{} = acct.worker.Backend
		c, ok := raw.(io.Closer)
		if !ok {
			continue
		}
		err := c.Close()
		if err != nil {
			returnErr = err
			log.Errorf("Closing backend failed for %s: %v", acct.Name(), err)
		}
	}
	return returnErr
}

func (aerc *Aerc) AddDialog(d ui.DrawableInteractive) {
	aerc.dialog = d
	aerc.Invalidate()
}

func (aerc *Aerc) CloseDialog() {
	aerc.dialog = nil
	aerc.Invalidate()
}

func (aerc *Aerc) GetPassword(title string, prompt string) (chText chan string, chErr chan error) {
	chText = make(chan string, 1)
	chErr = make(chan error, 1)
	getPasswd := NewGetPasswd(title, prompt, func(pw string, err error) {
		defer func() {
			close(chErr)
			close(chText)
			aerc.CloseDialog()
		}()
		if err != nil {
			chErr <- err
			return
		}
		chErr <- nil
		chText <- pw
	})
	aerc.AddDialog(getPasswd)

	return
}

func (aerc *Aerc) DecryptKeys(keys []openpgp.Key, symmetric bool) (b []byte, err error) {
	for _, key := range keys {
		ident := key.Entity.PrimaryIdentity()
		chPass, chErr := aerc.GetPassword("Decrypt PGP private key",
			fmt.Sprintf("Enter password for %s (%8X)\nPress <ESC> to cancel",
				ident.Name, key.PublicKey.KeyId))

		for err := range chErr {
			if err != nil {
				return nil, err
			}
			pass := <-chPass
			err = key.PrivateKey.Decrypt([]byte(pass))
			return nil, err
		}
	}
	return nil, err
}

// errorScreen is a widget that draws an error in the middle of the context
func errorScreen(s string) ui.Drawable {
	errstyle := config.Ui.GetStyle(config.STYLE_ERROR)
	text := ui.NewText(s, errstyle).Strategy(ui.TEXT_CENTER)
	grid := ui.NewGrid().Rows([]ui.GridSpec{
		{Strategy: ui.SIZE_WEIGHT, Size: ui.Const(1)},
		{Strategy: ui.SIZE_EXACT, Size: ui.Const(1)},
		{Strategy: ui.SIZE_WEIGHT, Size: ui.Const(1)},
	}).Columns([]ui.GridSpec{
		{Strategy: ui.SIZE_WEIGHT, Size: ui.Const(1)},
	})
	grid.AddChild(ui.NewFill(' ', vaxis.Style{})).At(0, 0)
	grid.AddChild(text).At(1, 0)
	grid.AddChild(ui.NewFill(' ', vaxis.Style{})).At(2, 0)
	return grid
}

func (aerc *Aerc) isExKey(key vaxis.Key, exKey config.KeyStroke) bool {
	return key.Matches(exKey.Key, exKey.Modifiers)
}

// CmdFallbackSearch checks cmds for the first executable availabe in PATH. An error is
// returned if none are found
func CmdFallbackSearch(cmds []string, silent bool) (string, error) {
	var tried []string
	for _, cmd := range cmds {
		if cmd == "" {
			continue
		}
		params := strings.Split(cmd, " ")
		_, err := exec.LookPath(params[0])
		if err != nil {
			tried = append(tried, cmd)
			if !silent {
				warn := fmt.Sprintf("cmd '%s' not found in PATH, using fallback", cmd)
				PushWarning(warn)
			}
			continue
		}
		return cmd, nil
	}
	return "", fmt.Errorf("no command found in PATH: %s", tried)
}