~rjarry/aerc

ref: 4240f1fbfd095724bcbb0ea49cfa561c973ba6ce aerc/config/config.go -rw-r--r-- 27.9 KiB
4240f1fbTim Culverhouse perf: reduce calls to GetUiConfig a month ago
                                                                                                    
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
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
package config

import (
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"net/url"
	"os"
	"os/exec"
	"path"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"time"
	"unicode"

	"github.com/gdamore/tcell/v2"
	"github.com/go-ini/ini"
	"github.com/imdario/mergo"
	"github.com/kyoh86/xdg"
	"github.com/mitchellh/go-homedir"

	"git.sr.ht/~rjarry/aerc/lib/templates"
)

type GeneralConfig struct {
	DefaultSavePath    string `ini:"default-save-path"`
	PgpProvider        string `ini:"pgp-provider"`
	UnsafeAccountsConf bool   `ini:"unsafe-accounts-conf"`
}

type UIConfig struct {
	IndexFormat         string        `ini:"index-format"`
	TimestampFormat     string        `ini:"timestamp-format"`
	ThisDayTimeFormat   string        `ini:"this-day-time-format"`
	ThisWeekTimeFormat  string        `ini:"this-week-time-format"`
	ThisYearTimeFormat  string        `ini:"this-year-time-format"`
	ShowHeaders         []string      `delim:","`
	RenderAccountTabs   string        `ini:"render-account-tabs"`
	PinnedTabMarker     string        `ini:"pinned-tab-marker"`
	SidebarWidth        int           `ini:"sidebar-width"`
	PreviewHeight       int           `ini:"preview-height"`
	EmptyMessage        string        `ini:"empty-message"`
	EmptyDirlist        string        `ini:"empty-dirlist"`
	MouseEnabled        bool          `ini:"mouse-enabled"`
	ThreadingEnabled    bool          `ini:"threading-enabled"`
	FuzzyComplete       bool          `ini:"fuzzy-complete"`
	NewMessageBell      bool          `ini:"new-message-bell"`
	Spinner             string        `ini:"spinner"`
	SpinnerDelimiter    string        `ini:"spinner-delimiter"`
	IconUnencrypted     string        `ini:"icon-unencrypted"`
	IconEncrypted       string        `ini:"icon-encrypted"`
	IconSigned          string        `ini:"icon-signed"`
	IconSignedEncrypted string        `ini:"icon-signed-encrypted"`
	IconUnknown         string        `ini:"icon-unknown"`
	IconInvalid         string        `ini:"icon-invalid"`
	DirListFormat       string        `ini:"dirlist-format"`
	DirListDelay        time.Duration `ini:"dirlist-delay"`
	DirListTree         bool          `ini:"dirlist-tree"`
	Sort                []string      `delim:" "`
	NextMessageOnDelete bool          `ini:"next-message-on-delete"`
	CompletionDelay     time.Duration `ini:"completion-delay"`
	CompletionPopovers  bool          `ini:"completion-popovers"`
	StyleSetDirs        []string      `ini:"stylesets-dirs" delim:":"`
	StyleSetName        string        `ini:"styleset-name"`
	style               StyleSet
	// customize border appearance
	BorderCharVertical   rune `ini:"-"`
	BorderCharHorizontal rune `ini:"-"`
}

type ContextType int

const (
	UI_CONTEXT_FOLDER ContextType = iota
	UI_CONTEXT_ACCOUNT
	UI_CONTEXT_SUBJECT
	BIND_CONTEXT_ACCOUNT
	BIND_CONTEXT_FOLDER
)

type UIConfigContext struct {
	ContextType ContextType
	Regex       *regexp.Regexp
	UiConfig    UIConfig
}

const (
	FILTER_MIMETYPE = iota
	FILTER_HEADER
)

type AccountConfig struct {
	Archive           string
	CopyTo            string
	Default           string
	Postpone          string
	From              string
	Aliases           string
	Name              string
	Source            string
	SourceCredCmd     string
	Folders           []string
	FoldersExclude    []string
	Params            map[string]string
	Outgoing          string
	OutgoingCredCmd   string
	SignatureFile     string
	SignatureCmd      string
	EnableFoldersSort bool     `ini:"enable-folders-sort"`
	FoldersSort       []string `ini:"folders-sort" delim:","`

	// CheckMail
	CheckMail        time.Duration `ini:"check-mail"`
	CheckMailCmd     string        `ini:"check-mail-cmd"`
	CheckMailTimeout time.Duration `ini:"check-mail-timeout"`
	CheckMailInclude []string      `ini:"check-mail-include"`
	CheckMailExclude []string      `ini:"check-mail-exclude"`

	// PGP Config
	PgpKeyId                string `ini:"pgp-key-id"`
	PgpAutoSign             bool   `ini:"pgp-auto-sign"`
	PgpOpportunisticEncrypt bool   `ini:"pgp-opportunistic-encrypt"`

	// AuthRes
	TrustedAuthRes []string `ini:"trusted-authres" delim:","`
}

type BindingConfig struct {
	Global                 *KeyBindings
	AccountWizard          *KeyBindings
	Compose                *KeyBindings
	ComposeEditor          *KeyBindings
	ComposeReview          *KeyBindings
	MessageList            *KeyBindings
	MessageView            *KeyBindings
	MessageViewPassthrough *KeyBindings
	Terminal               *KeyBindings
}

type BindingConfigContext struct {
	ContextType ContextType
	Regex       *regexp.Regexp
	Bindings    *KeyBindings
	BindContext string
}

type ComposeConfig struct {
	Editor         string     `ini:"editor"`
	HeaderLayout   [][]string `ini:"-"`
	AddressBookCmd string     `ini:"address-book-cmd"`
	ReplyToSelf    bool       `ini:"reply-to-self"`
}

type FilterConfig struct {
	FilterType int
	Filter     string
	Command    string
	Header     string
	Regex      *regexp.Regexp
}

type ViewerConfig struct {
	Pager          string
	Alternatives   []string
	ShowHeaders    bool       `ini:"show-headers"`
	AlwaysShowMime bool       `ini:"always-show-mime"`
	ParseHttpLinks bool       `ini:"parse-http-links"`
	HeaderLayout   [][]string `ini:"-"`
	KeyPassthrough bool       `ini:"-"`
}

type StatuslineConfig struct {
	RenderFormat string `ini:"render-format"`
	Separator    string
	DisplayMode  string `ini:"display-mode"`
}

type TriggersConfig struct {
	NewEmail       string `ini:"new-email"`
	ExecuteCommand func(command []string) error
}

type TemplateConfig struct {
	TemplateDirs []string `ini:"template-dirs" delim:":"`
	NewMessage   string   `ini:"new-message"`
	QuotedReply  string   `ini:"quoted-reply"`
	Forwards     string   `ini:"forwards"`
}

type AercConfig struct {
	Bindings        BindingConfig
	ContextualBinds []BindingConfigContext
	Compose         ComposeConfig
	Ini             *ini.File        `ini:"-"`
	Accounts        []AccountConfig  `ini:"-"`
	Filters         []FilterConfig   `ini:"-"`
	Viewer          ViewerConfig     `ini:"-"`
	Statusline      StatuslineConfig `ini:"-"`
	Triggers        TriggersConfig   `ini:"-"`
	Ui              UIConfig
	ContextualUis   []UIConfigContext
	General         GeneralConfig
	Templates       TemplateConfig
}

// Input: TimestampFormat
// Output: timestamp-format
func mapName(raw string) string {
	newstr := make([]rune, 0, len(raw))
	for i, chr := range raw {
		if isUpper := 'A' <= chr && chr <= 'Z'; isUpper {
			if i > 0 {
				newstr = append(newstr, '-')
			}
		}
		newstr = append(newstr, unicode.ToLower(chr))
	}
	return string(newstr)
}

func loadAccountConfig(path string) ([]AccountConfig, error) {
	file, err := ini.Load(path)
	if err != nil {
		// No config triggers account configuration wizard
		return nil, nil
	}
	file.NameMapper = mapName

	var accounts []AccountConfig
	for _, _sec := range file.SectionStrings() {
		if _sec == "DEFAULT" {
			continue
		}
		sec := file.Section(_sec)
		account := AccountConfig{
			Archive:           "Archive",
			Default:           "INBOX",
			Postpone:          "Drafts",
			Name:              _sec,
			Params:            make(map[string]string),
			EnableFoldersSort: true,
			CheckMailTimeout:  10 * time.Second,
		}
		if err = sec.MapTo(&account); err != nil {
			return nil, err
		}
		for key, val := range sec.KeysHash() {
			if key == "folders" {
				folders := strings.Split(val, ",")
				sort.Strings(folders)
				account.Folders = folders
			} else if key == "folders-exclude" {
				folders := strings.Split(val, ",")
				sort.Strings(folders)
				account.FoldersExclude = folders
			} else if key == "source-cred-cmd" {
				account.SourceCredCmd = val
			} else if key == "outgoing" {
				account.Outgoing = val
			} else if key == "outgoing-cred-cmd" {
				account.OutgoingCredCmd = val
			} else if key == "from" {
				account.From = val
			} else if key == "aliases" {
				account.Aliases = val
			} else if key == "copy-to" {
				account.CopyTo = val
			} else if key == "archive" {
				account.Archive = val
			} else if key == "enable-folders-sort" {
				account.EnableFoldersSort, _ = strconv.ParseBool(val)
			} else if key == "pgp-key-id" {
				account.PgpKeyId = val
			} else if key == "pgp-auto-sign" {
				account.PgpAutoSign, _ = strconv.ParseBool(val)
			} else if key == "pgp-opportunistic-encrypt" {
				account.PgpOpportunisticEncrypt, _ = strconv.ParseBool(val)
			} else if key != "name" {
				account.Params[key] = val
			}
		}
		if account.Source == "" {
			return nil, fmt.Errorf("Expected source for account %s", _sec)
		}
		if account.From == "" {
			return nil, fmt.Errorf("Expected from for account %s", _sec)
		}

		source, err := parseCredential(account.Source, account.SourceCredCmd)
		if err != nil {
			return nil, fmt.Errorf("Invalid source credentials for %s: %s", _sec, err)
		}
		account.Source = source

		outgoing, err := parseCredential(account.Outgoing, account.OutgoingCredCmd)
		if err != nil {
			return nil, fmt.Errorf("Invalid outgoing credentials for %s: %s", _sec, err)
		}
		account.Outgoing = outgoing

		accounts = append(accounts, account)
	}
	return accounts, nil
}

func parseCredential(cred, command string) (string, error) {
	if cred == "" || command == "" {
		return cred, nil
	}

	u, err := url.Parse(cred)
	if err != nil {
		return "", err
	}

	// ignore the command if a password is specified
	if _, exists := u.User.Password(); exists {
		return cred, nil
	}

	// don't attempt to parse the command if the url is a path (ie /usr/bin/sendmail)
	if !u.IsAbs() {
		return cred, nil
	}

	cmd := exec.Command("sh", "-c", command)
	cmd.Stdin = os.Stdin
	output, err := cmd.Output()
	if err != nil {
		return "", fmt.Errorf("failed to read password: %s", err)
	}

	pw := strings.TrimSpace(string(output))
	u.User = url.UserPassword(u.User.Username(), pw)

	return u.String(), nil
}

// Set at build time
var shareDir string

func buildDefaultDirs() []string {
	var defaultDirs []string

	prefixes := []string{
		xdg.ConfigHome(),
		xdg.DataHome(),
	}

	// Add XDG_CONFIG_HOME and XDG_DATA_HOME
	for _, v := range prefixes {
		if v != "" {
			v, err := homedir.Expand(v)
			if err != nil {
				log.Println(err)
			}
			defaultDirs = append(defaultDirs, path.Join(v, "aerc"))
		}
	}

	// Add custom buildtime shareDir
	if shareDir != "" && shareDir != "/usr/local/share/aerc" {
		shareDir, err := homedir.Expand(shareDir)
		if err == nil {
			defaultDirs = append(defaultDirs, shareDir)
		}
	}

	// Add fixed fallback locations
	defaultDirs = append(defaultDirs, "/usr/local/share/aerc")
	defaultDirs = append(defaultDirs, "/usr/share/aerc")

	return defaultDirs
}

var searchDirs = buildDefaultDirs()

func installTemplate(root, name string) error {
	var err error
	if _, err = os.Stat(root); os.IsNotExist(err) {
		err = os.MkdirAll(root, 0755)
		if err != nil {
			return err
		}
	}
	var data []byte
	for _, dir := range searchDirs {
		data, err = ioutil.ReadFile(path.Join(dir, name))
		if err == nil {
			break
		}
	}
	if err != nil {
		return err
	}
	err = ioutil.WriteFile(path.Join(root, name), data, 0644)
	if err != nil {
		return err
	}
	return nil
}

func (config *AercConfig) LoadConfig(file *ini.File) error {
	if filters, err := file.GetSection("filters"); err == nil {
		// TODO: Parse the filter more finely, e.g. parse the regex
		for _, match := range filters.KeyStrings() {
			cmd := filters.KeysHash()[match]
			filter := FilterConfig{
				Command: cmd,
				Filter:  match,
			}
			if strings.Contains(match, ",~") {
				filter.FilterType = FILTER_HEADER
				header := filter.Filter[:strings.Index(filter.Filter, ",")]
				regex := filter.Filter[strings.Index(filter.Filter, "~")+1:]
				filter.Header = strings.ToLower(header)
				filter.Regex, err = regexp.Compile(regex)
				if err != nil {
					return err
				}
			} else if strings.ContainsRune(match, ',') {
				filter.FilterType = FILTER_HEADER
				header := filter.Filter[:strings.Index(filter.Filter, ",")]
				value := filter.Filter[strings.Index(filter.Filter, ",")+1:]
				filter.Header = strings.ToLower(header)
				filter.Regex, err = regexp.Compile(regexp.QuoteMeta(value))
				if err != nil {
					return err
				}
			} else {
				filter.FilterType = FILTER_MIMETYPE
			}
			config.Filters = append(config.Filters, filter)
		}
	}
	if viewer, err := file.GetSection("viewer"); err == nil {
		if err := viewer.MapTo(&config.Viewer); err != nil {
			return err
		}
		for key, val := range viewer.KeysHash() {
			switch key {
			case "alternatives":
				config.Viewer.Alternatives = strings.Split(val, ",")
			case "header-layout":
				config.Viewer.HeaderLayout = parseLayout(val)
			}
		}
	}
	if statusline, err := file.GetSection("statusline"); err == nil {
		if err := statusline.MapTo(&config.Statusline); err != nil {
			return err
		}
	}
	if compose, err := file.GetSection("compose"); err == nil {
		if err := compose.MapTo(&config.Compose); err != nil {
			return err
		}
		for key, val := range compose.KeysHash() {
			switch key {
			case "header-layout":
				config.Compose.HeaderLayout = parseLayout(val)
			}
		}
	}

	if ui, err := file.GetSection("ui"); err == nil {
		if err := ui.MapTo(&config.Ui); err != nil {
			return err
		}
		if err := validateBorderChars(ui, &config.Ui); err != nil {
			return err
		}
		// Values with type=time.Duration must be explicitly set. If these
		// values are given a default in the struct passed to ui.MapTo, which
		// they are, a zero-value in the config won't overwrite the default.
		for key, val := range ui.KeysHash() {
			switch key {
			case "dirlist-delay":
				dur, err := time.ParseDuration(val)
				if err != nil {
					return err
				}
				config.Ui.DirListDelay = dur
			case "completion-delay":
				dur, err := time.ParseDuration(val)
				if err != nil {
					return err
				}
				config.Ui.CompletionDelay = dur
			}
		}
	}

	for _, sectionName := range file.SectionStrings() {
		if !strings.Contains(sectionName, "ui:") {
			continue
		}

		uiSection, err := file.GetSection(sectionName)
		if err != nil {
			return err
		}
		uiSubConfig := UIConfig{}
		if err := uiSection.MapTo(&uiSubConfig); err != nil {
			return err
		}
		if err := validateBorderChars(uiSection, &uiSubConfig); err != nil {
			return err
		}
		contextualUi :=
			UIConfigContext{
				UiConfig: uiSubConfig,
			}

		var index int
		if strings.Contains(sectionName, "~") {
			index = strings.Index(sectionName, "~")
			regex := string(sectionName[index+1:])
			contextualUi.Regex, err = regexp.Compile(regex)
			if err != nil {
				return err
			}
		} else if strings.Contains(sectionName, "=") {
			index = strings.Index(sectionName, "=")
			value := string(sectionName[index+1:])
			contextualUi.Regex, err = regexp.Compile(regexp.QuoteMeta(value))
			if err != nil {
				return err
			}
		} else {
			return fmt.Errorf("Invalid Ui Context regex in %s", sectionName)
		}

		switch sectionName[3:index] {
		case "account":
			contextualUi.ContextType = UI_CONTEXT_ACCOUNT
		case "folder":
			contextualUi.ContextType = UI_CONTEXT_FOLDER
		case "subject":
			contextualUi.ContextType = UI_CONTEXT_SUBJECT
		default:
			return fmt.Errorf("Unknown Contextual Ui Section: %s", sectionName)
		}
		config.ContextualUis = append(config.ContextualUis, contextualUi)
	}
	if triggers, err := file.GetSection("triggers"); err == nil {
		if err := triggers.MapTo(&config.Triggers); err != nil {
			return err
		}
	}
	if templatesSec, err := file.GetSection("templates"); err == nil {
		if err := templatesSec.MapTo(&config.Templates); err != nil {
			return err
		}
		templateDirs := templatesSec.Key("template-dirs").String()
		if templateDirs != "" {
			config.Templates.TemplateDirs = strings.Split(templateDirs, ":")
		}
	}

	// append default paths to template-dirs and styleset-dirs
	for _, dir := range searchDirs {
		config.Ui.StyleSetDirs = append(
			config.Ui.StyleSetDirs, path.Join(dir, "stylesets"),
		)
		config.Templates.TemplateDirs = append(
			config.Templates.TemplateDirs, path.Join(dir, "templates"),
		)
	}

	// we want to fail during startup if the templates are not ok
	// hence we do dummy executes here
	t := config.Templates
	if err := templates.CheckTemplate(t.NewMessage, t.TemplateDirs); err != nil {
		return err
	}
	if err := templates.CheckTemplate(t.QuotedReply, t.TemplateDirs); err != nil {
		return err
	}
	if err := templates.CheckTemplate(t.Forwards, t.TemplateDirs); err != nil {
		return err
	}
	if err := config.Ui.loadStyleSet(
		config.Ui.StyleSetDirs); err != nil {
		return err
	}

	for idx, contextualUi := range config.ContextualUis {
		if contextualUi.UiConfig.StyleSetName == "" &&
			len(contextualUi.UiConfig.StyleSetDirs) == 0 {
			continue // no need to do anything if nothing is overridden
		}
		// fill in the missing part from the base
		if contextualUi.UiConfig.StyleSetName == "" {
			config.ContextualUis[idx].UiConfig.StyleSetName = config.Ui.StyleSetName
		} else if len(contextualUi.UiConfig.StyleSetDirs) == 0 {
			config.ContextualUis[idx].UiConfig.StyleSetDirs = config.Ui.StyleSetDirs
		}
		// since at least one of them has changed, load the styleset
		if err := config.ContextualUis[idx].UiConfig.loadStyleSet(
			config.ContextualUis[idx].UiConfig.StyleSetDirs); err != nil {
			return err
		}
	}

	return nil
}

func validateBorderChars(section *ini.Section, config *UIConfig) error {
	for key, val := range section.KeysHash() {
		switch key {
		case "border-char-vertical":
			char := []rune(val)
			if len(char) != 1 {
				return fmt.Errorf("%v must be one and only one character", key)
			}
			config.BorderCharVertical = char[0]
		case "border-char-horizontal":
			char := []rune(val)
			if len(char) != 1 {
				return fmt.Errorf("%v must be one and only one character", key)
			}
			config.BorderCharHorizontal = char[0]
		}
	}
	return nil
}

func validatePgpProvider(section *ini.Section) error {
	m := map[string]bool{
		"gpg":      true,
		"internal": true,
	}
	for key, val := range section.KeysHash() {
		switch key {
		case "pgp-provider":
			if !m[strings.ToLower(val)] {
				return fmt.Errorf("%v must be either 'gpg' or 'internal'", key)
			}
		}
	}
	return nil
}

func LoadConfigFromFile(root *string, logger *log.Logger) (*AercConfig, error) {
	if root == nil {
		_root := path.Join(xdg.ConfigHome(), "aerc")
		root = &_root
	}
	filename := path.Join(*root, "aerc.conf")

	// if it doesn't exist copy over the template, then load
	if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
		if err := installTemplate(*root, "aerc.conf"); err != nil {
			return nil, err
		}
	}

	file, err := ini.LoadSources(ini.LoadOptions{
		KeyValueDelimiters: "=",
	}, filename)
	if err != nil {
		return nil, err
	}
	file.NameMapper = mapName
	config := &AercConfig{
		Bindings: BindingConfig{
			Global:                 NewKeyBindings(),
			AccountWizard:          NewKeyBindings(),
			Compose:                NewKeyBindings(),
			ComposeEditor:          NewKeyBindings(),
			ComposeReview:          NewKeyBindings(),
			MessageList:            NewKeyBindings(),
			MessageView:            NewKeyBindings(),
			MessageViewPassthrough: NewKeyBindings(),
			Terminal:               NewKeyBindings(),
		},

		ContextualBinds: []BindingConfigContext{},

		Ini: file,

		General: GeneralConfig{
			PgpProvider:        "internal",
			UnsafeAccountsConf: false,
		},

		Ui: UIConfig{
			IndexFormat:        "%D %-17.17n %s",
			TimestampFormat:    "2006-01-02 03:04 PM",
			ThisDayTimeFormat:  "",
			ThisWeekTimeFormat: "",
			ThisYearTimeFormat: "",
			ShowHeaders: []string{
				"From", "To", "Cc", "Bcc", "Subject", "Date",
			},
			RenderAccountTabs:   "auto",
			PinnedTabMarker:     "`",
			SidebarWidth:        20,
			PreviewHeight:       12,
			EmptyMessage:        "(no messages)",
			EmptyDirlist:        "(no folders)",
			MouseEnabled:        false,
			NewMessageBell:      true,
			FuzzyComplete:       false,
			Spinner:             "[..]    , [..]   ,  [..]  ,   [..] ,    [..],   [..] ,  [..]  , [..]   ",
			SpinnerDelimiter:    ",",
			IconUnencrypted:     "",
			IconSigned:          "[s]",
			IconEncrypted:       "[e]",
			IconSignedEncrypted: "",
			IconUnknown:         "[s?]",
			IconInvalid:         "[s!]",
			DirListFormat:       "%n %>r",
			DirListDelay:        200 * time.Millisecond,
			NextMessageOnDelete: true,
			CompletionDelay:     250 * time.Millisecond,
			CompletionPopovers:  true,
			StyleSetDirs:        []string{},
			StyleSetName:        "default",
			// border defaults
			BorderCharVertical:   ' ',
			BorderCharHorizontal: ' ',
		},

		ContextualUis: []UIConfigContext{},

		Viewer: ViewerConfig{
			Pager:        "less -R",
			Alternatives: []string{"text/plain", "text/html"},
			ShowHeaders:  false,
			HeaderLayout: [][]string{
				{"From", "To"},
				{"Cc", "Bcc"},
				{"Date"},
				{"Subject"},
			},
			ParseHttpLinks: true,
		},

		Statusline: StatuslineConfig{
			RenderFormat: "[%a] %S %>%T",
			Separator:    " | ",
			DisplayMode:  "",
		},

		Compose: ComposeConfig{
			HeaderLayout: [][]string{
				{"To", "From"},
				{"Subject"},
			},
			ReplyToSelf: true,
		},

		Templates: TemplateConfig{
			TemplateDirs: []string{},
			NewMessage:   "new_message",
			QuotedReply:  "quoted_reply",
			Forwards:     "forward_as_body",
		},
	}

	// These bindings are not configurable
	config.Bindings.AccountWizard.ExKey = KeyStroke{
		Key: tcell.KeyCtrlE,
	}
	quit, _ := ParseBinding("<C-q>", ":quit<Enter>")
	config.Bindings.AccountWizard.Add(quit)

	if err = config.LoadConfig(file); err != nil {
		return nil, err
	}

	if ui, err := file.GetSection("general"); err == nil {
		if err := ui.MapTo(&config.General); err != nil {
			return nil, err
		}
		if err := validatePgpProvider(ui); err != nil {
			return nil, err
		}
	}

	filename = path.Join(*root, "accounts.conf")
	if !config.General.UnsafeAccountsConf {
		if err := checkConfigPerms(filename); err != nil {
			return nil, err
		}
	}

	accountsPath := path.Join(*root, "accounts.conf")
	if accounts, err := loadAccountConfig(accountsPath); err != nil {
		return nil, err
	} else {
		config.Accounts = accounts
	}

	filename = path.Join(*root, "binds.conf")
	binds, err := ini.Load(filename)
	if err != nil {
		if err := installTemplate(*root, "binds.conf"); err != nil {
			return nil, err
		}
		if binds, err = ini.Load(filename); err != nil {
			return nil, err
		}
	}

	baseGroups := map[string]**KeyBindings{
		"default":           &config.Bindings.Global,
		"compose":           &config.Bindings.Compose,
		"messages":          &config.Bindings.MessageList,
		"terminal":          &config.Bindings.Terminal,
		"view":              &config.Bindings.MessageView,
		"view::passthrough": &config.Bindings.MessageViewPassthrough,
		"compose::editor":   &config.Bindings.ComposeEditor,
		"compose::review":   &config.Bindings.ComposeReview,
	}

	// Base Bindings
	for _, sectionName := range binds.SectionStrings() {
		// Handle :: delimeter
		baseSectionName := strings.Replace(sectionName, "::", "////", -1)
		sections := strings.Split(baseSectionName, ":")
		baseOnly := len(sections) == 1
		baseSectionName = strings.Replace(sections[0], "////", "::", -1)

		group, ok := baseGroups[strings.ToLower(baseSectionName)]
		if !ok {
			return nil, errors.New("Unknown keybinding group " + sectionName)
		}

		if baseOnly {
			err = config.LoadBinds(binds, baseSectionName, group, logger)
			if err != nil {
				return nil, err
			}
		}
	}

	config.Bindings.Global.Globals = false
	for _, contextBind := range config.ContextualBinds {
		if contextBind.BindContext == "default" {
			contextBind.Bindings.Globals = false
		}
	}

	return config, nil
}

func LoadBindingSection(sec *ini.Section) (*KeyBindings, error) {
	bindings := NewKeyBindings()
	for key, value := range sec.KeysHash() {
		if key == "$ex" {
			strokes, err := ParseKeyStrokes(value)
			if err != nil {
				return nil, err
			}
			if len(strokes) != 1 {
				return nil, errors.New("Invalid binding")
			}
			bindings.ExKey = strokes[0]
			continue
		}
		if key == "$noinherit" {
			if value == "false" {
				continue
			}
			if value != "true" {
				return nil, errors.New("Invalid binding")
			}
			bindings.Globals = false
			continue
		}
		binding, err := ParseBinding(key, value)
		if err != nil {
			return nil, err
		}
		bindings.Add(binding)
	}
	return bindings, nil
}

func (config *AercConfig) LoadBinds(binds *ini.File, baseName string, baseGroup **KeyBindings, logger *log.Logger) error {

	if sec, err := binds.GetSection(baseName); err == nil {
		binds, err := LoadBindingSection(sec)
		if err != nil {
			return err
		}
		*baseGroup = MergeBindings(binds, *baseGroup)
	}

	for _, sectionName := range binds.SectionStrings() {
		if !strings.Contains(sectionName, baseName+":") ||
			strings.Contains(sectionName, baseName+"::") {
			continue
		}

		bindSection, err := binds.GetSection(sectionName)
		if err != nil {
			return err
		}

		binds, err := LoadBindingSection(bindSection)
		if err != nil {
			return err
		}

		contextualBind :=
			BindingConfigContext{
				Bindings:    binds,
				BindContext: baseName,
			}

		var index int
		if strings.Contains(sectionName, "=") {
			index = strings.Index(sectionName, "=")
			value := string(sectionName[index+1:])
			contextualBind.Regex, err = regexp.Compile(value)
			if err != nil {
				return err
			}
		} else {
			return fmt.Errorf("Invalid Bind Context regex in %s", sectionName)
		}

		switch sectionName[len(baseName)+1 : index] {
		case "account":
			acctName := sectionName[index+1:]
			valid := false
			for _, acctConf := range config.Accounts {
				matches := contextualBind.Regex.FindString(acctConf.Name)
				if matches != "" {
					valid = true
				}
			}
			if !valid {
				logger.Printf("Tried to define binds for unexistent account: %v\n", acctName)
				continue
			}
			contextualBind.ContextType = BIND_CONTEXT_ACCOUNT
		case "folder":
			// No validation needed. If the folder doesn't exist, the binds
			// never get used
			contextualBind.ContextType = BIND_CONTEXT_FOLDER
		default:
			return fmt.Errorf("Unknown Context Bind Section: %s", sectionName)
		}
		config.ContextualBinds = append(config.ContextualBinds, contextualBind)
	}

	return nil
}

// checkConfigPerms checks for too open permissions
// printing the fix on stdout and returning an error
func checkConfigPerms(filename string) error {
	info, err := os.Stat(filename)
	if errors.Is(err, os.ErrNotExist) {
		return nil // disregard absent files
	}
	if err != nil {
		return err
	}

	perms := info.Mode().Perm()
	// group or others have read access
	if perms&044 != 0 {
		fmt.Fprintf(os.Stderr, "The file %v has too open permissions.\n", filename)
		fmt.Fprintln(os.Stderr, "This is a security issue (it contains passwords).")
		fmt.Fprintf(os.Stderr, "To fix it, run `chmod 600 %v`\n", filename)
		return errors.New("account.conf permissions too lax")
	}
	return nil
}

func parseLayout(layout string) [][]string {
	rows := strings.Split(layout, ",")
	l := make([][]string, len(rows))
	for i, r := range rows {
		l[i] = strings.Split(r, "|")
	}
	return l
}

func (ui *UIConfig) loadStyleSet(styleSetDirs []string) error {
	ui.style = NewStyleSet()
	err := ui.style.LoadStyleSet(ui.StyleSetName, styleSetDirs)
	if err != nil {
		return fmt.Errorf("Unable to load default styleset: %s", err)
	}

	return nil
}

func (config AercConfig) mergeContextualUi(baseUi UIConfig,
	contextType ContextType, s string) UIConfig {
	for _, contextualUi := range config.ContextualUis {
		if contextualUi.ContextType != contextType {
			continue
		}

		if !contextualUi.Regex.Match([]byte(s)) {
			continue
		}

		mergo.Merge(&baseUi, contextualUi.UiConfig, mergo.WithOverride)
		if contextualUi.UiConfig.StyleSetName != "" {
			baseUi.style = contextualUi.UiConfig.style
		}
		return baseUi
	}

	return baseUi
}

func (config AercConfig) GetUiConfig(params map[ContextType]string) *UIConfig {
	baseUi := config.Ui

	for k, v := range params {
		baseUi = config.mergeContextualUi(baseUi, k, v)
	}

	return &baseUi
}

func (config *AercConfig) GetContextualUIConfigs() []UIConfigContext {
	return config.ContextualUis
}

func (uiConfig UIConfig) GetStyle(so StyleObject) tcell.Style {
	return uiConfig.style.Get(so)
}

func (uiConfig UIConfig) GetStyleSelected(so StyleObject) tcell.Style {
	return uiConfig.style.Selected(so)
}

func (uiConfig UIConfig) GetComposedStyle(base StyleObject,
	styles []StyleObject) tcell.Style {
	return uiConfig.style.Compose(base, styles)
}

func (uiConfig UIConfig) GetComposedStyleSelected(base StyleObject, styles []StyleObject) tcell.Style {
	return uiConfig.style.ComposeSelected(base, styles)
}