summaryrefslogtreecommitdiff
path: root/widgets/msgviewer.go
blob: 6c69577131d01c7dbe1c45df6cb9c7cd155a25c2 (plain)
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
package widgets

import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"regexp"
	"strings"

	"github.com/danwakefield/fnmatch"
	"github.com/gdamore/tcell"
	"github.com/google/shlex"
	"github.com/mattn/go-runewidth"

	"git.sr.ht/~sircmpwn/aerc/config"
	"git.sr.ht/~sircmpwn/aerc/lib"
	"git.sr.ht/~sircmpwn/aerc/lib/format"
	"git.sr.ht/~sircmpwn/aerc/lib/ui"
	"git.sr.ht/~sircmpwn/aerc/models"
)

var ansi = regexp.MustCompile("\x1B\\[[0-?]*[ -/]*[@-~]")

var _ ProvidesMessages = (*MessageViewer)(nil)

type MessageViewer struct {
	ui.Invalidatable
	acct     *AccountView
	conf     *config.AercConfig
	err      error
	grid     *ui.Grid
	switcher *PartSwitcher
	msg      lib.MessageView
	uiConfig config.UIConfig
}

type PartSwitcher struct {
	ui.Invalidatable
	parts          []*PartViewer
	selected       int
	showHeaders    bool
	alwaysShowMime bool

	height int
	mv     *MessageViewer
}

func NewMessageViewer(acct *AccountView,
	conf *config.AercConfig, msg lib.MessageView) *MessageViewer {

	hf := HeaderLayoutFilter{
		layout: HeaderLayout(conf.Viewer.HeaderLayout),
		keep: func(msg *models.MessageInfo, header string) bool {
			if fmtHeader(msg, header, "2") != "" {
				return true
			}
			return false
		},
	}
	layout := hf.forMessage(msg.MessageInfo())
	header, headerHeight := layout.grid(
		func(header string) ui.Drawable {
			return &HeaderView{
				conf: conf,
				Name: header,
				Value: fmtHeader(msg.MessageInfo(), header,
					acct.UiConfig().TimestampFormat),
				uiConfig: acct.UiConfig(),
			}
		},
	)

	rows := []ui.GridSpec{
		{ui.SIZE_EXACT, ui.Const(headerHeight)},
	}

	if msg.PGPDetails() != nil {
		height := 1
		if msg.PGPDetails().IsSigned && msg.PGPDetails().IsEncrypted {
			height = 2
		}
		rows = append(rows, ui.GridSpec{ui.SIZE_EXACT, ui.Const(height)})
	}

	rows = append(rows, []ui.GridSpec{
		{ui.SIZE_EXACT, ui.Const(1)},
		{ui.SIZE_WEIGHT, ui.Const(1)},
	}...)

	grid := ui.NewGrid().Rows(rows).Columns([]ui.GridSpec{
		{ui.SIZE_WEIGHT, ui.Const(1)},
	})

	switcher := &PartSwitcher{}
	err := createSwitcher(acct, switcher, conf, msg)
	if err != nil {
		return &MessageViewer{
			err:      err,
			grid:     grid,
			msg:      msg,
			uiConfig: acct.UiConfig(),
		}
	}

	grid.AddChild(header).At(0, 0)
	if msg.PGPDetails() != nil {
		grid.AddChild(NewPGPInfo(msg.PGPDetails(), acct.UiConfig())).At(1, 0)
		grid.AddChild(ui.NewFill(' ')).At(2, 0)
		grid.AddChild(switcher).At(3, 0)
	} else {
		grid.AddChild(ui.NewFill(' ')).At(1, 0)
		grid.AddChild(switcher).At(2, 0)
	}

	mv := &MessageViewer{
		acct:     acct,
		conf:     conf,
		grid:     grid,
		msg:      msg,
		switcher: switcher,
		uiConfig: acct.UiConfig(),
	}
	switcher.mv = mv

	return mv
}

func fmtHeader(msg *models.MessageInfo, header string, timefmt string) string {
	switch header {
	case "From":
		return format.FormatAddresses(msg.Envelope.From)
	case "To":
		return format.FormatAddresses(msg.Envelope.To)
	case "Cc":
		return format.FormatAddresses(msg.Envelope.Cc)
	case "Bcc":
		return format.FormatAddresses(msg.Envelope.Bcc)
	case "Date":
		return msg.Envelope.Date.Local().Format(timefmt)
	case "Subject":
		return msg.Envelope.Subject
	case "Labels":
		return strings.Join(msg.Labels, ", ")
	default:
		return msg.RFC822Headers.Get(header)
	}
}

func enumerateParts(acct *AccountView, conf *config.AercConfig,
	msg lib.MessageView, body *models.BodyStructure,
	index []int) ([]*PartViewer, error) {

	var parts []*PartViewer
	for i, part := range body.Parts {
		curindex := append(index, i+1)
		if part.MIMEType == "multipart" {
			// Multipart meta-parts are faked
			pv := &PartViewer{part: part}
			parts = append(parts, pv)
			subParts, err := enumerateParts(
				acct, conf, msg, part, curindex)
			if err != nil {
				return nil, err
			}
			parts = append(parts, subParts...)
			continue
		}
		pv, err := NewPartViewer(acct, conf, msg, part, curindex)
		if err != nil {
			return nil, err
		}
		parts = append(parts, pv)
	}
	return parts, nil
}

func createSwitcher(acct *AccountView, switcher *PartSwitcher,
	conf *config.AercConfig, msg lib.MessageView) error {

	var err error
	switcher.selected = -1
	switcher.showHeaders = conf.Viewer.ShowHeaders
	switcher.alwaysShowMime = conf.Viewer.AlwaysShowMime

	if len(msg.BodyStructure().Parts) == 0 {
		switcher.selected = 0
		pv, err := NewPartViewer(acct, conf, msg, msg.BodyStructure(), nil)
		if err != nil {
			return err
		}
		switcher.parts = []*PartViewer{pv}
		pv.OnInvalidate(func(_ ui.Drawable) {
			switcher.Invalidate()
		})
	} else {
		switcher.parts, err = enumerateParts(acct, conf, msg,
			msg.BodyStructure(), []int{})
		if err != nil {
			return err
		}
		selectedPriority := -1
		fmt.Printf("Selecting best message from %v\n", conf.Viewer.Alternatives)
		for i, pv := range switcher.parts {
			pv.OnInvalidate(func(_ ui.Drawable) {
				switcher.Invalidate()
			})
			// Switch to user's preferred mimetype
			if switcher.selected == -1 && pv.part.MIMEType != "multipart" {
				switcher.selected = i
			}
			mime := strings.ToLower(pv.part.MIMEType) +
				"/" + strings.ToLower(pv.part.MIMESubType)
			for idx, m := range conf.Viewer.Alternatives {
				if m != mime {
					continue
				}
				priority := len(conf.Viewer.Alternatives) - idx
				if priority > selectedPriority {
					selectedPriority = priority
					switcher.selected = i
				}
			}
		}
	}
	return nil
}

func (mv *MessageViewer) Draw(ctx *ui.Context) {
	if mv.err != nil {
		style := mv.acct.UiConfig().GetStyle(config.STYLE_DEFAULT)
		ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style)
		ctx.Printf(0, 0, style, "%s", mv.err.Error())
		return
	}
	mv.grid.Draw(ctx)
}

func (mv *MessageViewer) MouseEvent(localX int, localY int, event tcell.Event) {
	if mv.err != nil {
		return
	}
	mv.grid.MouseEvent(localX, localY, event)
}

func (mv *MessageViewer) Invalidate() {
	mv.grid.Invalidate()
}

func (mv *MessageViewer) OnInvalidate(fn func(d ui.Drawable)) {
	mv.grid.OnInvalidate(func(_ ui.Drawable) {
		fn(mv)
	})
}

func (mv *MessageViewer) Store() *lib.MessageStore {
	return mv.msg.Store()
}

func (mv *MessageViewer) SelectedAccount() *AccountView {
	return mv.acct
}

func (mv *MessageViewer) SelectedMessage() (*models.MessageInfo, error) {
	if mv.msg == nil {
		return nil, errors.New("no message selected")
	}
	return mv.msg.MessageInfo(), nil
}

func (mv *MessageViewer) MarkedMessages() ([]uint32, error) {
	store := mv.Store()
	return store.Marked(), nil
}

func (mv *MessageViewer) ToggleHeaders() {
	switcher := mv.switcher
	mv.conf.Viewer.ShowHeaders = !mv.conf.Viewer.ShowHeaders
	err := createSwitcher(mv.acct, switcher, mv.conf, mv.msg)
	if err != nil {
		mv.acct.Logger().Printf(
			"warning: error during create switcher - %v", err)
	}
	switcher.Invalidate()
}

func (mv *MessageViewer) SelectedMessagePart() *PartInfo {
	switcher := mv.switcher
	part := switcher.parts[switcher.selected]

	return &PartInfo{
		Index: part.index,
		Msg:   part.msg.MessageInfo(),
		Part:  part.part,
	}
}

func (mv *MessageViewer) PreviousPart() {
	switcher := mv.switcher
	for {
		switcher.selected--
		if switcher.selected < 0 {
			switcher.selected = len(switcher.parts) - 1
		}
		if switcher.parts[switcher.selected].part.MIMEType != "multipart" {
			break
		}
	}
	mv.Invalidate()
}

func (mv *MessageViewer) NextPart() {
	switcher := mv.switcher
	for {
		switcher.selected++
		if switcher.selected >= len(switcher.parts) {
			switcher.selected = 0
		}
		if switcher.parts[switcher.selected].part.MIMEType != "multipart" {
			break
		}
	}
	mv.Invalidate()
}

func (mv *MessageViewer) Close() error {
	mv.switcher.Cleanup()
	return nil
}

func (ps *PartSwitcher) Invalidate() {
	ps.DoInvalidate(ps)
}

func (ps *PartSwitcher) Focus(focus bool) {
	if ps.parts[ps.selected].term != nil {
		ps.parts[ps.selected].term.Focus(focus)
	}
}

func (ps *PartSwitcher) Event(event tcell.Event) bool {
	return ps.parts[ps.selected].Event(event)
}

func (ps *PartSwitcher) Draw(ctx *ui.Context) {
	height := len(ps.parts)
	if height == 1 && !ps.alwaysShowMime {
		ps.parts[ps.selected].Draw(ctx)
		return
	}
	// TODO: cap height and add scrolling for messages with many parts
	ps.height = ctx.Height()
	y := ctx.Height() - height
	for i, part := range ps.parts {
		style := ps.mv.uiConfig.GetStyle(config.STYLE_DEFAULT)
		if ps.selected == i {
			style = ps.mv.uiConfig.GetStyleSelected(config.STYLE_DEFAULT)
		}
		ctx.Fill(0, y+i, ctx.Width(), 1, ' ', style)
		name := fmt.Sprintf("%s/%s",
			strings.ToLower(part.part.MIMEType),
			strings.ToLower(part.part.MIMESubType))
		if filename, ok := part.part.DispositionParams["filename"]; ok {
			name += fmt.Sprintf(" (%s)", filename)
		} else if filename, ok := part.part.Params["name"]; ok {
			// workaround golang not supporting RFC2231 besides ASCII and UTF8
			name += fmt.Sprintf(" (%s)", filename)
		}
		ctx.Printf(len(part.index)*2, y+i, style, "%s", name)
	}
	ps.parts[ps.selected].Draw(ctx.Subcontext(
		0, 0, ctx.Width(), ctx.Height()-height))
}

func (ps *PartSwitcher) MouseEvent(localX int, localY int, event tcell.Event) {
	switch event := event.(type) {
	case *tcell.EventMouse:
		switch event.Buttons() {
		case tcell.Button1:
			height := len(ps.parts)
			y := ps.height - height
			if localY < y && ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.MouseEvent(localX, localY, event)
			}
			for i := range ps.parts {
				if localY != y+i {
					continue
				}
				if ps.parts[i].part.MIMEType == "multipart" {
					continue
				}
				if ps.parts[ps.selected].term != nil {
					ps.parts[ps.selected].term.Focus(false)
				}
				ps.selected = i
				ps.Invalidate()
				if ps.parts[ps.selected].term != nil {
					ps.parts[ps.selected].term.Focus(true)
				}
			}
		case tcell.WheelDown:
			height := len(ps.parts)
			y := ps.height - height
			if localY < y && ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.MouseEvent(localX, localY, event)
			}
			if ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.Focus(false)
			}
			ps.mv.NextPart()
			if ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.Focus(true)
			}
		case tcell.WheelUp:
			height := len(ps.parts)
			y := ps.height - height
			if localY < y && ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.MouseEvent(localX, localY, event)
			}
			if ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.Focus(false)
			}
			ps.mv.PreviousPart()
			if ps.parts[ps.selected].term != nil {
				ps.parts[ps.selected].term.Focus(true)
			}
		}
	}
}

func (ps *PartSwitcher) Cleanup() {
	for _, partViewer := range ps.parts {
		partViewer.Cleanup()
	}
}

func (mv *MessageViewer) Event(event tcell.Event) bool {
	return mv.switcher.Event(event)
}

func (mv *MessageViewer) Focus(focus bool) {
	mv.switcher.Focus(focus)
}

type PartViewer struct {
	ui.Invalidatable
	conf        *config.AercConfig
	err         error
	fetched     bool
	filter      *exec.Cmd
	index       []int
	msg         lib.MessageView
	pager       *exec.Cmd
	pagerin     io.WriteCloser
	part        *models.BodyStructure
	showHeaders bool
	sink        io.WriteCloser
	source      io.Reader
	term        *Terminal
	selector    *Selector
	grid        *ui.Grid
	uiConfig    config.UIConfig
}

func NewPartViewer(acct *AccountView, conf *config.AercConfig,
	msg lib.MessageView, part *models.BodyStructure,
	index []int) (*PartViewer, error) {

	var (
		filter  *exec.Cmd
		pager   *exec.Cmd
		pipe    io.WriteCloser
		pagerin io.WriteCloser
		term    *Terminal
	)
	cmd, err := shlex.Split(conf.Viewer.Pager)
	if err != nil {
		return nil, err
	}

	pager = exec.Command(cmd[0], cmd[1:]...)

	info := msg.MessageInfo()
	for _, f := range conf.Filters {
		mime := strings.ToLower(part.MIMEType) +
			"/" + strings.ToLower(part.MIMESubType)
		switch f.FilterType {
		case config.FILTER_MIMETYPE:
			if fnmatch.Match(f.Filter, mime, 0) {
				filter = exec.Command("sh", "-c", f.Command)
			}
		case config.FILTER_HEADER:
			var header string
			switch f.Header {
			case "subject":
				header = info.Envelope.Subject
			case "from":
				header = format.FormatAddresses(info.Envelope.From)
			case "to":
				header = format.FormatAddresses(info.Envelope.To)
			case "cc":
				header = format.FormatAddresses(info.Envelope.Cc)
			}
			if f.Regex.Match([]byte(header)) {
				filter = exec.Command("sh", "-c", f.Command)
			}
		}
		if filter != nil {
			break
		}
	}
	if filter != nil {
		if pipe, err = filter.StdinPipe(); err != nil {
			return nil, err
		}
		if pagerin, _ = pager.StdinPipe(); err != nil {
			return nil, err
		}
		if term, err = NewTerminal(pager); err != nil {
			return nil, err
		}
	}

	grid := ui.NewGrid().Rows([]ui.GridSpec{
		{ui.SIZE_EXACT, ui.Const(3)}, // Message
		{ui.SIZE_EXACT, ui.Const(1)}, // Selector
		{ui.SIZE_WEIGHT, ui.Const(1)},
	}).Columns([]ui.GridSpec{
		{ui.SIZE_WEIGHT, ui.Const(1)},
	})

	selector := NewSelector([]string{"Save message", "Pipe to command"},
		0, acct.UiConfig()).
		OnChoose(func(option string) {
			switch option {
			case "Save message":
				acct.aerc.BeginExCommand("save ")
			case "Pipe to command":
				acct.aerc.BeginExCommand("pipe ")
			}
		})

	grid.AddChild(selector).At(2, 0)

	pv := &PartViewer{
		conf:        conf,
		filter:      filter,
		index:       index,
		msg:         msg,
		pager:       pager,
		pagerin:     pagerin,
		part:        part,
		showHeaders: conf.Viewer.ShowHeaders,
		sink:        pipe,
		term:        term,
		selector:    selector,
		grid:        grid,
		uiConfig:    acct.UiConfig(),
	}

	if term != nil {
		term.OnStart = func() {
			pv.attemptCopy()
		}
		term.OnInvalidate(func(_ ui.Drawable) {
			pv.Invalidate()
		})
	}

	return pv, nil
}

func (pv *PartViewer) SetSource(reader io.Reader) {
	pv.source = reader
	pv.attemptCopy()
}

func (pv *PartViewer) attemptCopy() {
	if pv.source == nil || pv.pager == nil || pv.pager.Process == nil {
		return
	}
	if pv.filter != nil {
		pv.copyFilterOutToPager() //delayed until we write to the sink
	}
	go func() {
		pv.writeMailHeaders()
		if strings.EqualFold(pv.part.MIMEType, "text") {
			// if the content is plain we can strip ansi control chars
			pv.copySourceToSinkStripAnsi()
		} else {
			// if it's binary we have to rely on the filter to be sane
			io.Copy(pv.sink, pv.source)
		}
		pv.sink.Close()
	}()
}

func (pv *PartViewer) writeMailHeaders() {
	info := pv.msg.MessageInfo()
	if pv.showHeaders && info.RFC822Headers != nil {
		// header need to bypass the filter, else we run into issues
		// with the filter messing with newlines etc.
		// hence all writes in this block go directly to the pager
		fields := info.RFC822Headers.Fields()
		for fields.Next() {
			var value string
			var err error
			if value, err = fields.Text(); err != nil {
				// better than nothing, use the non decoded version
				value = fields.Value()
			}
			field := fmt.Sprintf(
				"%s: %s\n", fields.Key(), value)
			pv.pagerin.Write([]byte(field))
		}
		// virtual header
		if len(info.Labels) != 0 {
			labels := fmtHeader(info, "Labels", "")
			pv.pagerin.Write([]byte(fmt.Sprintf("Labels: %s\n", labels)))
		}
		pv.pagerin.Write([]byte{'\n'})
	}
}

func (pv *PartViewer) copyFilterOutToPager() {
	stdout, _ := pv.filter.StdoutPipe()
	stderr, _ := pv.filter.StderrPipe()
	pv.filter.Start()
	ch := make(chan interface{})
	go func() {
		_, err := io.Copy(pv.pagerin, stdout)
		if err != nil {
			pv.err = err
			pv.Invalidate()
		}
		stdout.Close()
		ch <- nil
	}()
	go func() {
		_, err := io.Copy(pv.pagerin, stderr)
		if err != nil {
			pv.err = err
			pv.Invalidate()
		}
		stderr.Close()
		ch <- nil
	}()
	go func() {
		<-ch
		<-ch
		pv.filter.Wait()
		pv.pagerin.Close()
	}()
}

func (pv *PartViewer) copySourceToSinkStripAnsi() {
	scanner := bufio.NewScanner(pv.source)
	// some people send around huge html without any newline in between
	// this did overflow the default 64KB buffer of bufio.Scanner.
	// If something can't fit in a GB there's no hope left
	scanner.Buffer(nil, 1024*1024*1024)
	for scanner.Scan() {
		text := scanner.Text()
		text = ansi.ReplaceAllString(text, "")
		io.WriteString(pv.sink, text+"\n")
	}
	if err := scanner.Err(); err != nil {
		fmt.Fprintf(os.Stderr, "failed to read line: %v\n", err)
	}
}

func (pv *PartViewer) Invalidate() {
	pv.DoInvalidate(pv)
}

func (pv *PartViewer) Draw(ctx *ui.Context) {
	style := pv.uiConfig.GetStyle(config.STYLE_DEFAULT)
	styleError := pv.uiConfig.GetStyle(config.STYLE_ERROR)
	if pv.filter == nil {
		// TODO: Let them download it directly or something
		ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style)
		ctx.Printf(0, 0, styleError,
			"No filter configured for this mimetype ('%s/%s')",
			pv.part.MIMEType, pv.part.MIMESubType,
		)
		ctx.Printf(0, 2, style,
			"You can still :save the message or :pipe it to an external command")
		pv.selector.Focus(true)
		pv.grid.Draw(ctx)
		return
	}
	if !pv.fetched {
		pv.msg.FetchBodyPart(pv.index, pv.SetSource)
		pv.fetched = true
	}
	if pv.err != nil {
		ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style)
		ctx.Printf(0, 0, style, "%s", pv.err.Error())
		return
	}
	pv.term.Draw(ctx)
}

func (pv *PartViewer) Cleanup() {
	if pv.pager != nil && pv.pager.Process != nil {
		pv.pager.Process.Kill()
		pv.pager = nil
	}
}

func (pv *PartViewer) Event(event tcell.Event) bool {
	if pv.term != nil {
		return pv.term.Event(event)
	}
	return pv.selector.Event(event)
}

type HeaderView struct {
	ui.Invalidatable
	conf     *config.AercConfig
	Name     string
	Value    string
	uiConfig config.UIConfig
}

func (hv *HeaderView) Draw(ctx *ui.Context) {
	name := hv.Name
	size := runewidth.StringWidth(name)
	lim := ctx.Width() - size - 1
	value := runewidth.Truncate(" "+hv.Value, lim, "…")

	vstyle := hv.uiConfig.GetStyle(config.STYLE_DEFAULT)
	hstyle := hv.uiConfig.GetStyle(config.STYLE_HEADER)

	// TODO: Make this more robust and less dumb
	if hv.Name == "PGP" {
		vstyle = hv.uiConfig.GetStyle(config.STYLE_SUCCESS)
	}

	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', vstyle)
	ctx.Printf(0, 0, hstyle, "%s", name)
	ctx.Printf(size, 0, vstyle, "%s", value)
}

func (hv *HeaderView) Invalidate() {
	hv.DoInvalidate(hv)
}