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
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
use std::{
    cell::RefCell,
    io::{self, Write},
    path::Path,
    sync::Arc,
    time::Instant,
};

use {
    grep_matcher::Matcher,
    grep_searcher::{Searcher, Sink, SinkError, SinkFinish, SinkMatch},
    termcolor::{ColorSpec, NoColor, WriteColor},
};

use crate::{
    color::ColorSpecs,
    counter::CounterWriter,
    hyperlink::{self, HyperlinkConfig},
    stats::Stats,
    util::{find_iter_at_in_context, PrinterPath},
};

/// The configuration for the summary printer.
///
/// This is manipulated by the SummaryBuilder and then referenced by the actual
/// implementation. Once a printer is build, the configuration is frozen and
/// cannot changed.
#[derive(Debug, Clone)]
struct Config {
    kind: SummaryKind,
    colors: ColorSpecs,
    hyperlink: HyperlinkConfig,
    stats: bool,
    path: bool,
    max_matches: Option<u64>,
    exclude_zero: bool,
    separator_field: Arc<Vec<u8>>,
    separator_path: Option<u8>,
    path_terminator: Option<u8>,
}

impl Default for Config {
    fn default() -> Config {
        Config {
            kind: SummaryKind::Count,
            colors: ColorSpecs::default(),
            hyperlink: HyperlinkConfig::default(),
            stats: false,
            path: true,
            max_matches: None,
            exclude_zero: true,
            separator_field: Arc::new(b":".to_vec()),
            separator_path: None,
            path_terminator: None,
        }
    }
}

/// The type of summary output (if any) to print.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum SummaryKind {
    /// Show only a count of the total number of matches (counting each line
    /// at most once) found.
    ///
    /// If the `path` setting is enabled, then the count is prefixed by the
    /// corresponding file path.
    Count,
    /// Show only a count of the total number of matches (counting possibly
    /// many matches on each line) found.
    ///
    /// If the `path` setting is enabled, then the count is prefixed by the
    /// corresponding file path.
    CountMatches,
    /// Show only the file path if and only if a match was found.
    ///
    /// This ignores the `path` setting and always shows the file path. If no
    /// file path is provided, then searching will immediately stop and return
    /// an error.
    PathWithMatch,
    /// Show only the file path if and only if a match was found.
    ///
    /// This ignores the `path` setting and always shows the file path. If no
    /// file path is provided, then searching will immediately stop and return
    /// an error.
    PathWithoutMatch,
    /// Don't show any output and the stop the search once a match is found.
    ///
    /// Note that if `stats` is enabled, then searching continues in order to
    /// compute statistics.
    Quiet,
}

impl SummaryKind {
    /// Returns true if and only if this output mode requires a file path.
    ///
    /// When an output mode requires a file path, then the summary printer
    /// will report an error at the start of every search that lacks a file
    /// path.
    fn requires_path(&self) -> bool {
        use self::SummaryKind::*;

        match *self {
            PathWithMatch | PathWithoutMatch => true,
            Count | CountMatches | Quiet => false,
        }
    }

    /// Returns true if and only if this output mode requires computing
    /// statistics, regardless of whether they have been enabled or not.
    fn requires_stats(&self) -> bool {
        use self::SummaryKind::*;

        match *self {
            CountMatches => true,
            Count | PathWithMatch | PathWithoutMatch | Quiet => false,
        }
    }

    /// Returns true if and only if a printer using this output mode can
    /// quit after seeing the first match.
    fn quit_early(&self) -> bool {
        use self::SummaryKind::*;

        match *self {
            PathWithMatch | Quiet => true,
            Count | CountMatches | PathWithoutMatch => false,
        }
    }
}

/// A builder for summary printer.
///
/// The builder permits configuring how the printer behaves. The summary
/// printer has fewer configuration options than the standard printer because
/// it aims to produce aggregate output about a single search (typically just
/// one line) instead of output for each match.
///
/// Once a `Summary` printer is built, its configuration cannot be changed.
#[derive(Clone, Debug)]
pub struct SummaryBuilder {
    config: Config,
}

impl SummaryBuilder {
    /// Return a new builder for configuring the summary printer.
    pub fn new() -> SummaryBuilder {
        SummaryBuilder { config: Config::default() }
    }

    /// Build a printer using any implementation of `termcolor::WriteColor`.
    ///
    /// The implementation of `WriteColor` used here controls whether colors
    /// are used or not when colors have been configured using the
    /// `color_specs` method.
    ///
    /// For maximum portability, callers should generally use either
    /// `termcolor::StandardStream` or `termcolor::BufferedStandardStream`
    /// where appropriate, which will automatically enable colors on Windows
    /// when possible.
    ///
    /// However, callers may also provide an arbitrary writer using the
    /// `termcolor::Ansi` or `termcolor::NoColor` wrappers, which always enable
    /// colors via ANSI escapes or always disable colors, respectively.
    ///
    /// As a convenience, callers may use `build_no_color` to automatically
    /// select the `termcolor::NoColor` wrapper to avoid needing to import
    /// from `termcolor` explicitly.
    pub fn build<W: WriteColor>(&self, wtr: W) -> Summary<W> {
        Summary {
            config: self.config.clone(),
            wtr: RefCell::new(CounterWriter::new(wtr)),
        }
    }

    /// Build a printer from any implementation of `io::Write` and never emit
    /// any colors, regardless of the user color specification settings.
    ///
    /// This is a convenience routine for
    /// `SummaryBuilder::build(termcolor::NoColor::new(wtr))`.
    pub fn build_no_color<W: io::Write>(&self, wtr: W) -> Summary<NoColor<W>> {
        self.build(NoColor::new(wtr))
    }

    /// Set the output mode for this printer.
    ///
    /// The output mode controls how aggregate results of a search are printed.
    ///
    /// By default, this printer uses the `Count` mode.
    pub fn kind(&mut self, kind: SummaryKind) -> &mut SummaryBuilder {
        self.config.kind = kind;
        self
    }

    /// Set the user color specifications to use for coloring in this printer.
    ///
    /// A [`UserColorSpec`](crate::UserColorSpec) can be constructed from
    /// a string in accordance with the color specification format. See
    /// the `UserColorSpec` type documentation for more details on the
    /// format. A [`ColorSpecs`] can then be generated from zero or more
    /// `UserColorSpec`s.
    ///
    /// Regardless of the color specifications provided here, whether color
    /// is actually used or not is determined by the implementation of
    /// `WriteColor` provided to `build`. For example, if `termcolor::NoColor`
    /// is provided to `build`, then no color will ever be printed regardless
    /// of the color specifications provided here.
    ///
    /// This completely overrides any previous color specifications. This does
    /// not add to any previously provided color specifications on this
    /// builder.
    ///
    /// The default color specifications provide no styling.
    pub fn color_specs(&mut self, specs: ColorSpecs) -> &mut SummaryBuilder {
        self.config.colors = specs;
        self
    }

    /// Set the configuration to use for hyperlinks output by this printer.
    ///
    /// Regardless of the hyperlink format provided here, whether hyperlinks
    /// are actually used or not is determined by the implementation of
    /// `WriteColor` provided to `build`. For example, if `termcolor::NoColor`
    /// is provided to `build`, then no hyperlinks will ever be printed
    /// regardless of the format provided here.
    ///
    /// This completely overrides any previous hyperlink format.
    ///
    /// The default configuration results in not emitting any hyperlinks.
    pub fn hyperlink(
        &mut self,
        config: HyperlinkConfig,
    ) -> &mut SummaryBuilder {
        self.config.hyperlink = config;
        self
    }

    /// Enable the gathering of various aggregate statistics.
    ///
    /// When this is enabled (it's disabled by default), statistics will be
    /// gathered for all uses of `Summary` printer returned by `build`,
    /// including but not limited to, the total number of matches, the total
    /// number of bytes searched and the total number of bytes printed.
    ///
    /// Aggregate statistics can be accessed via the sink's
    /// [`SummarySink::stats`] method.
    ///
    /// When this is enabled, this printer may need to do extra work in order
    /// to compute certain statistics, which could cause the search to take
    /// longer. For example, in `Quiet` mode, a search can quit after finding
    /// the first match, but if `stats` is enabled, then the search will
    /// continue after the first match in order to compute statistics.
    ///
    /// For a complete description of available statistics, see [`Stats`].
    ///
    /// Note that some output modes, such as `CountMatches`, automatically
    /// enable this option even if it has been explicitly disabled.
    pub fn stats(&mut self, yes: bool) -> &mut SummaryBuilder {
        self.config.stats = yes;
        self
    }

    /// When enabled, if a path was given to the printer, then it is shown in
    /// the output (either as a heading or as a prefix to each matching line).
    /// When disabled, then no paths are ever included in the output even when
    /// a path is provided to the printer.
    ///
    /// This setting has no effect in `PathWithMatch` and `PathWithoutMatch`
    /// modes.
    ///
    /// This is enabled by default.
    pub fn path(&mut self, yes: bool) -> &mut SummaryBuilder {
        self.config.path = yes;
        self
    }

    /// Set the maximum amount of matches that are printed.
    ///
    /// If multi line search is enabled and a match spans multiple lines, then
    /// that match is counted exactly once for the purposes of enforcing this
    /// limit, regardless of how many lines it spans.
    ///
    /// This is disabled by default.
    pub fn max_matches(&mut self, limit: Option<u64>) -> &mut SummaryBuilder {
        self.config.max_matches = limit;
        self
    }

    /// Exclude count-related summary results with no matches.
    ///
    /// When enabled and the mode is either `Count` or `CountMatches`, then
    /// results are not printed if no matches were found. Otherwise, every
    /// search prints a result with a possibly `0` number of matches.
    ///
    /// This is enabled by default.
    pub fn exclude_zero(&mut self, yes: bool) -> &mut SummaryBuilder {
        self.config.exclude_zero = yes;
        self
    }

    /// Set the separator used between fields for the `Count` and
    /// `CountMatches` modes.
    ///
    /// By default, this is set to `:`.
    pub fn separator_field(&mut self, sep: Vec<u8>) -> &mut SummaryBuilder {
        self.config.separator_field = Arc::new(sep);
        self
    }

    /// Set the path separator used when printing file paths.
    ///
    /// Typically, printing is done by emitting the file path as is. However,
    /// this setting provides the ability to use a different path separator
    /// from what the current environment has configured.
    ///
    /// A typical use for this option is to permit cygwin users on Windows to
    /// set the path separator to `/` instead of using the system default of
    /// `\`.
    ///
    /// This is disabled by default.
    pub fn separator_path(&mut self, sep: Option<u8>) -> &mut SummaryBuilder {
        self.config.separator_path = sep;
        self
    }

    /// Set the path terminator used.
    ///
    /// The path terminator is a byte that is printed after every file path
    /// emitted by this printer.
    ///
    /// If no path terminator is set (the default), then paths are terminated
    /// by either new lines or the configured field separator.
    pub fn path_terminator(
        &mut self,
        terminator: Option<u8>,
    ) -> &mut SummaryBuilder {
        self.config.path_terminator = terminator;
        self
    }
}

/// The summary printer, which emits aggregate results from a search.
///
/// Aggregate results generally correspond to file paths and/or the number of
/// matches found.
///
/// A default printer can be created with either of the `Summary::new` or
/// `Summary::new_no_color` constructors. However, there are a number of
/// options that configure this printer's output. Those options can be
/// configured using [`SummaryBuilder`].
///
/// This type is generic over `W`, which represents any implementation of
/// the `termcolor::WriteColor` trait.
#[derive(Debug)]
pub struct Summary<W> {
    config: Config,
    wtr: RefCell<CounterWriter<W>>,
}

impl<W: WriteColor> Summary<W> {
    /// Return a summary printer with a default configuration that writes
    /// matches to the given writer.
    ///
    /// The writer should be an implementation of `termcolor::WriteColor`
    /// and not just a bare implementation of `io::Write`. To use a normal
    /// `io::Write` implementation (simultaneously sacrificing colors), use
    /// the `new_no_color` constructor.
    ///
    /// The default configuration uses the `Count` summary mode.
    pub fn new(wtr: W) -> Summary<W> {
        SummaryBuilder::new().build(wtr)
    }
}

impl<W: io::Write> Summary<NoColor<W>> {
    /// Return a summary printer with a default configuration that writes
    /// matches to the given writer.
    ///
    /// The writer can be any implementation of `io::Write`. With this
    /// constructor, the printer will never emit colors.
    ///
    /// The default configuration uses the `Count` summary mode.
    pub fn new_no_color(wtr: W) -> Summary<NoColor<W>> {
        SummaryBuilder::new().build_no_color(wtr)
    }
}

impl<W: WriteColor> Summary<W> {
    /// Return an implementation of `Sink` for the summary printer.
    ///
    /// This does not associate the printer with a file path, which means this
    /// implementation will never print a file path. If the output mode of
    /// this summary printer does not make sense without a file path (such as
    /// `PathWithMatch` or `PathWithoutMatch`), then any searches executed
    /// using this sink will immediately quit with an error.
    pub fn sink<'s, M: Matcher>(
        &'s mut self,
        matcher: M,
    ) -> SummarySink<'static, 's, M, W> {
        let interpolator =
            hyperlink::Interpolator::new(&self.config.hyperlink);
        let stats = if self.config.stats || self.config.kind.requires_stats() {
            Some(Stats::new())
        } else {
            None
        };
        SummarySink {
            matcher,
            summary: self,
            interpolator,
            path: None,
            start_time: Instant::now(),
            match_count: 0,
            binary_byte_offset: None,
            stats,
        }
    }

    /// Return an implementation of `Sink` associated with a file path.
    ///
    /// When the printer is associated with a path, then it may, depending on
    /// its configuration, print the path.
    pub fn sink_with_path<'p, 's, M, P>(
        &'s mut self,
        matcher: M,
        path: &'p P,
    ) -> SummarySink<'p, 's, M, W>
    where
        M: Matcher,
        P: ?Sized + AsRef<Path>,
    {
        if !self.config.path && !self.config.kind.requires_path() {
            return self.sink(matcher);
        }
        let interpolator =
            hyperlink::Interpolator::new(&self.config.hyperlink);
        let stats = if self.config.stats || self.config.kind.requires_stats() {
            Some(Stats::new())
        } else {
            None
        };
        let ppath = PrinterPath::new(path.as_ref())
            .with_separator(self.config.separator_path);
        SummarySink {
            matcher,
            summary: self,
            interpolator,
            path: Some(ppath),
            start_time: Instant::now(),
            match_count: 0,
            binary_byte_offset: None,
            stats,
        }
    }
}

impl<W> Summary<W> {
    /// Returns true if and only if this printer has written at least one byte
    /// to the underlying writer during any of the previous searches.
    pub fn has_written(&self) -> bool {
        self.wtr.borrow().total_count() > 0
    }

    /// Return a mutable reference to the underlying writer.
    pub fn get_mut(&mut self) -> &mut W {
        self.wtr.get_mut().get_mut()
    }

    /// Consume this printer and return back ownership of the underlying
    /// writer.
    pub fn into_inner(self) -> W {
        self.wtr.into_inner().into_inner()
    }
}

/// An implementation of `Sink` associated with a matcher and an optional file
/// path for the summary printer.
///
/// This type is generic over a few type parameters:
///
/// * `'p` refers to the lifetime of the file path, if one is provided. When
/// no file path is given, then this is `'static`.
/// * `'s` refers to the lifetime of the [`Summary`] printer that this type
/// borrows.
/// * `M` refers to the type of matcher used by
/// `grep_searcher::Searcher` that is reporting results to this sink.
/// * `W` refers to the underlying writer that this printer is writing its
/// output to.
#[derive(Debug)]
pub struct SummarySink<'p, 's, M: Matcher, W> {
    matcher: M,
    summary: &'s mut Summary<W>,
    interpolator: hyperlink::Interpolator,
    path: Option<PrinterPath<'p>>,
    start_time: Instant,
    match_count: u64,
    binary_byte_offset: Option<u64>,
    stats: Option<Stats>,
}

impl<'p, 's, M: Matcher, W: WriteColor> SummarySink<'p, 's, M, W> {
    /// Returns true if and only if this printer received a match in the
    /// previous search.
    ///
    /// This is unaffected by the result of searches before the previous
    /// search.
    pub fn has_match(&self) -> bool {
        match self.summary.config.kind {
            SummaryKind::PathWithoutMatch => self.match_count == 0,
            _ => self.match_count > 0,
        }
    }

    /// If binary data was found in the previous search, this returns the
    /// offset at which the binary data was first detected.
    ///
    /// The offset returned is an absolute offset relative to the entire
    /// set of bytes searched.
    ///
    /// This is unaffected by the result of searches before the previous
    /// search. e.g., If the search prior to the previous search found binary
    /// data but the previous search found no binary data, then this will
    /// return `None`.
    pub fn binary_byte_offset(&self) -> Option<u64> {
        self.binary_byte_offset
    }

    /// Return a reference to the stats produced by the printer for all
    /// searches executed on this sink.
    ///
    /// This only returns stats if they were requested via the
    /// [`SummaryBuilder`] configuration.
    pub fn stats(&self) -> Option<&Stats> {
        self.stats.as_ref()
    }

    /// Returns true if and only if the searcher may report matches over
    /// multiple lines.
    ///
    /// Note that this doesn't just return whether the searcher is in multi
    /// line mode, but also checks if the matter can match over multiple lines.
    /// If it can't, then we don't need multi line handling, even if the
    /// searcher has multi line mode enabled.
    fn multi_line(&self, searcher: &Searcher) -> bool {
        searcher.multi_line_with_matcher(&self.matcher)
    }

    /// Returns true if this printer should quit.
    ///
    /// This implements the logic for handling quitting after seeing a certain
    /// amount of matches. In most cases, the logic is simple, but we must
    /// permit all "after" contextual lines to print after reaching the limit.
    fn should_quit(&self) -> bool {
        let limit = match self.summary.config.max_matches {
            None => return false,
            Some(limit) => limit,
        };
        self.match_count >= limit
    }

    /// If this printer has a file path associated with it, then this will
    /// write that path to the underlying writer followed by a line terminator.
    /// (If a path terminator is set, then that is used instead of the line
    /// terminator.)
    fn write_path_line(&mut self, searcher: &Searcher) -> io::Result<()> {
        if self.path.is_some() {
            self.write_path()?;
            if let Some(term) = self.summary.config.path_terminator {
                self.write(&[term])?;
            } else {
                self.write_line_term(searcher)?;
            }
        }
        Ok(())
    }

    /// If this printer has a file path associated with it, then this will
    /// write that path to the underlying writer followed by the field
    /// separator. (If a path terminator is set, then that is used instead of
    /// the field separator.)
    fn write_path_field(&mut self) -> io::Result<()> {
        if self.path.is_some() {
            self.write_path()?;
            if let Some(term) = self.summary.config.path_terminator {
                self.write(&[term])?;
            } else {
                self.write(&self.summary.config.separator_field)?;
            }
        }
        Ok(())
    }

    /// If this printer has a file path associated with it, then this will
    /// write that path to the underlying writer in the appropriate style
    /// (color and hyperlink).
    fn write_path(&mut self) -> io::Result<()> {
        if self.path.is_some() {
            let status = self.start_hyperlink()?;
            self.write_spec(
                self.summary.config.colors.path(),
                self.path.as_ref().unwrap().as_bytes(),
            )?;
            self.end_hyperlink(status)?;
        }
        Ok(())
    }

    /// Starts a hyperlink span when applicable.
    fn start_hyperlink(
        &mut self,
    ) -> io::Result<hyperlink::InterpolatorStatus> {
        let Some(hyperpath) =
            self.path.as_ref().and_then(|p| p.as_hyperlink())
        else {
            return Ok(hyperlink::InterpolatorStatus::inactive());
        };
        let values = hyperlink::Values::new(hyperpath);
        self.interpolator.begin(&values, &mut *self.summary.wtr.borrow_mut())
    }

    fn end_hyperlink(
        &self,
        status: hyperlink::InterpolatorStatus,
    ) -> io::Result<()> {
        self.interpolator.finish(status, &mut *self.summary.wtr.borrow_mut())
    }

    /// Write the line terminator configured on the given searcher.
    fn write_line_term(&self, searcher: &Searcher) -> io::Result<()> {
        self.write(searcher.line_terminator().as_bytes())
    }

    /// Write the given bytes using the give style.
    fn write_spec(&self, spec: &ColorSpec, buf: &[u8]) -> io::Result<()> {
        self.summary.wtr.borrow_mut().set_color(spec)?;
        self.write(buf)?;
        self.summary.wtr.borrow_mut().reset()?;
        Ok(())
    }

    /// Write all of the given bytes.
    fn write(&self, buf: &[u8]) -> io::Result<()> {
        self.summary.wtr.borrow_mut().write_all(buf)
    }
}

impl<'p, 's, M: Matcher, W: WriteColor> Sink for SummarySink<'p, 's, M, W> {
    type Error = io::Error;

    fn matched(
        &mut self,
        searcher: &Searcher,
        mat: &SinkMatch<'_>,
    ) -> Result<bool, io::Error> {
        let is_multi_line = self.multi_line(searcher);
        let sink_match_count = if self.stats.is_none() && !is_multi_line {
            1
        } else {
            // This gives us as many bytes as the searcher can offer. This
            // isn't guaranteed to hold the necessary context to get match
            // detection correct (because of look-around), but it does in
            // practice.
            let buf = mat.buffer();
            let range = mat.bytes_range_in_buffer();
            let mut count = 0;
            find_iter_at_in_context(
                searcher,
                &self.matcher,
                buf,
                range,
                |_| {
                    count += 1;
                    true
                },
            )?;
            count
        };
        if is_multi_line {
            self.match_count += sink_match_count;
        } else {
            self.match_count += 1;
        }
        if let Some(ref mut stats) = self.stats {
            stats.add_matches(sink_match_count);
            stats.add_matched_lines(mat.lines().count() as u64);
        } else if self.summary.config.kind.quit_early() {
            return Ok(false);
        }
        Ok(!self.should_quit())
    }

    fn begin(&mut self, _searcher: &Searcher) -> Result<bool, io::Error> {
        if self.path.is_none() && self.summary.config.kind.requires_path() {
            return Err(io::Error::error_message(format!(
                "output kind {:?} requires a file path",
                self.summary.config.kind,
            )));
        }
        self.summary.wtr.borrow_mut().reset_count();
        self.start_time = Instant::now();
        self.match_count = 0;
        self.binary_byte_offset = None;
        if self.summary.config.max_matches == Some(0) {
            return Ok(false);
        }

        Ok(true)
    }

    fn finish(
        &mut self,
        searcher: &Searcher,
        finish: &SinkFinish,
    ) -> Result<(), io::Error> {
        self.binary_byte_offset = finish.binary_byte_offset();
        if let Some(ref mut stats) = self.stats {
            stats.add_elapsed(self.start_time.elapsed());
            stats.add_searches(1);
            if self.match_count > 0 {
                stats.add_searches_with_match(1);
            }
            stats.add_bytes_searched(finish.byte_count());
            stats.add_bytes_printed(self.summary.wtr.borrow().count());
        }
        // If our binary detection method says to quit after seeing binary
        // data, then we shouldn't print any results at all, even if we've
        // found a match before detecting binary data. The intent here is to
        // keep BinaryDetection::quit as a form of filter. Otherwise, we can
        // present a matching file with a smaller number of matches than
        // there might be, which can be quite misleading.
        //
        // If our binary detection method is to convert binary data, then we
        // don't quit and therefore search the entire contents of the file.
        //
        // There is an unfortunate inconsistency here. Namely, when using
        // Quiet or PathWithMatch, then the printer can quit after the first
        // match seen, which could be long before seeing binary data. This
        // means that using PathWithMatch can print a path where as using
        // Count might not print it at all because of binary data.
        //
        // It's not possible to fix this without also potentially significantly
        // impacting the performance of Quiet or PathWithMatch, so we accept
        // the bug.
        if self.binary_byte_offset.is_some()
            && searcher.binary_detection().quit_byte().is_some()
        {
            // Squash the match count. The statistics reported will still
            // contain the match count, but the "official" match count should
            // be zero.
            self.match_count = 0;
            return Ok(());
        }

        let show_count =
            !self.summary.config.exclude_zero || self.match_count > 0;
        match self.summary.config.kind {
            SummaryKind::Count => {
                if show_count {
                    self.write_path_field()?;
                    self.write(self.match_count.to_string().as_bytes())?;
                    self.write_line_term(searcher)?;
                }
            }
            SummaryKind::CountMatches => {
                if show_count {
                    self.write_path_field()?;
                    let stats = self
                        .stats
                        .as_ref()
                        .expect("CountMatches should enable stats tracking");
                    self.write(stats.matches().to_string().as_bytes())?;
                    self.write_line_term(searcher)?;
                }
            }
            SummaryKind::PathWithMatch => {
                if self.match_count > 0 {
                    self.write_path_line(searcher)?;
                }
            }
            SummaryKind::PathWithoutMatch => {
                if self.match_count == 0 {
                    self.write_path_line(searcher)?;
                }
            }
            SummaryKind::Quiet => {}
        }
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use grep_regex::RegexMatcher;
    use grep_searcher::SearcherBuilder;
    use termcolor::NoColor;

    use super::{Summary, SummaryBuilder, SummaryKind};

    const SHERLOCK: &'static [u8] = b"\
For the Doctor Watsons of this world, as opposed to the Sherlock
Holmeses, success in the province of detective work must always
be, to a very large extent, the result of luck. Sherlock Holmes
can extract a clew from a wisp of straw or a flake of cigar ash;
but Doctor Watson has to have it taken out for him and dusted,
and exhibited clearly, with a label attached.
";

    fn printer_contents(printer: &mut Summary<NoColor<Vec<u8>>>) -> String {
        String::from_utf8(printer.get_mut().get_ref().to_owned()).unwrap()
    }

    #[test]
    fn path_with_match_error() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithMatch)
            .build_no_color(vec![]);
        let res = SearcherBuilder::new().build().search_reader(
            &matcher,
            SHERLOCK,
            printer.sink(&matcher),
        );
        assert!(res.is_err());
    }

    #[test]
    fn path_without_match_error() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithoutMatch)
            .build_no_color(vec![]);
        let res = SearcherBuilder::new().build().search_reader(
            &matcher,
            SHERLOCK,
            printer.sink(&matcher),
        );
        assert!(res.is_err());
    }

    #[test]
    fn count_no_path() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(&matcher, SHERLOCK, printer.sink(&matcher))
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("2\n", got);
    }

    #[test]
    fn count_no_path_even_with_path() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .path(false)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("2\n", got);
    }

    #[test]
    fn count_path() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock:2\n", got);
    }

    #[test]
    fn count_path_with_zero() {
        let matcher = RegexMatcher::new(r"NO MATCH").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .exclude_zero(false)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock:0\n", got);
    }

    #[test]
    fn count_path_without_zero() {
        let matcher = RegexMatcher::new(r"NO MATCH").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .exclude_zero(true)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("", got);
    }

    #[test]
    fn count_path_field_separator() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .separator_field(b"ZZ".to_vec())
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlockZZ2\n", got);
    }

    #[test]
    fn count_path_terminator() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .path_terminator(Some(b'\x00'))
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock\x002\n", got);
    }

    #[test]
    fn count_path_separator() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .separator_path(Some(b'\\'))
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "/home/andrew/sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("\\home\\andrew\\sherlock:2\n", got);
    }

    #[test]
    fn count_max_matches() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Count)
            .max_matches(Some(1))
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(&matcher, SHERLOCK, printer.sink(&matcher))
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("1\n", got);
    }

    #[test]
    fn count_matches() {
        let matcher = RegexMatcher::new(r"Watson|Sherlock").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::CountMatches)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock:4\n", got);
    }

    #[test]
    fn path_with_match_found() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithMatch)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock\n", got);
    }

    #[test]
    fn path_with_match_not_found() {
        let matcher = RegexMatcher::new(r"ZZZZZZZZ").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithMatch)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("", got);
    }

    #[test]
    fn path_without_match_found() {
        let matcher = RegexMatcher::new(r"ZZZZZZZZZ").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithoutMatch)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("sherlock\n", got);
    }

    #[test]
    fn path_without_match_not_found() {
        let matcher = RegexMatcher::new(r"Watson").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::PathWithoutMatch)
            .build_no_color(vec![]);
        SearcherBuilder::new()
            .build()
            .search_reader(
                &matcher,
                SHERLOCK,
                printer.sink_with_path(&matcher, "sherlock"),
            )
            .unwrap();

        let got = printer_contents(&mut printer);
        assert_eq_printed!("", got);
    }

    #[test]
    fn quiet() {
        let matcher = RegexMatcher::new(r"Watson|Sherlock").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Quiet)
            .build_no_color(vec![]);
        let match_count = {
            let mut sink = printer.sink_with_path(&matcher, "sherlock");
            SearcherBuilder::new()
                .build()
                .search_reader(&matcher, SHERLOCK, &mut sink)
                .unwrap();
            sink.match_count
        };

        let got = printer_contents(&mut printer);
        assert_eq_printed!("", got);
        // There is actually more than one match, but Quiet should quit after
        // finding the first one.
        assert_eq!(1, match_count);
    }

    #[test]
    fn quiet_with_stats() {
        let matcher = RegexMatcher::new(r"Watson|Sherlock").unwrap();
        let mut printer = SummaryBuilder::new()
            .kind(SummaryKind::Quiet)
            .stats(true)
            .build_no_color(vec![]);
        let match_count = {
            let mut sink = printer.sink_with_path(&matcher, "sherlock");
            SearcherBuilder::new()
                .build()
                .search_reader(&matcher, SHERLOCK, &mut sink)
                .unwrap();
            sink.match_count
        };

        let got = printer_contents(&mut printer);
        assert_eq_printed!("", got);
        // There is actually more than one match, and Quiet will usually quit
        // after finding the first one, but since we request stats, it will
        // mush on to find all matches.
        assert_eq!(3, match_count);
    }
}