miette/
lib.rs

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
#![deny(missing_docs, missing_debug_implementations, nonstandard_style)]
#![warn(unreachable_pub, rust_2018_idioms)]
//! You run miette? You run her code like the software? Oh. Oh! Error code for
//! coder! Error code for One Thousand Lines!
//!
//! ## About
//!
//! `miette` is a diagnostic library for Rust. It includes a series of
//! traits/protocols that allow you to hook into its error reporting facilities,
//! and even write your own error reports! It lets you define error types that
//! can print out like this (or in any format you like!):
//!
//! <img src="https://raw.githubusercontent.com/zkat/miette/main/images/serde_json.png" alt="Hi! miette also includes a screen-reader-oriented diagnostic printer that's enabled in various situations, such as when you use NO_COLOR or CLICOLOR settings, or on CI. This behavior is also fully configurable and customizable. For example, this is what this particular diagnostic will look like when the narrated printer is enabled:
//! \
//! Error: Received some bad JSON from the source. Unable to parse.
//!     Caused by: missing field `foo` at line 1 column 1700
//! \
//! Begin snippet for https://api.nuget.org/v3/registration5-gz-semver2/json.net/index.json starting
//! at line 1, column 1659
//! \
//! snippet line 1: gs&quot;:[&quot;json&quot;],&quot;title&quot;:&quot;&quot;,&quot;version&quot;:&quot;1.0.0&quot;},&quot;packageContent&quot;:&quot;https://api.nuget.o
//!     highlight starting at line 1, column 1699: last parsing location
//! \
//! diagnostic help: This is a bug. It might be in ruget, or it might be in the
//! source you're using, but it's definitely a bug and should be reported.
//! diagnostic error code: ruget::api::bad_json
//! " />
//!
//! > **NOTE: You must enable the `"fancy"` crate feature to get fancy report
//! output like in the screenshots above.** You should only do this in your
//! toplevel crate, as the fancy feature pulls in a number of dependencies that
//! libraries and such might not want.
//!
//! ## Table of Contents <!-- omit in toc -->
//!
//! - [About](#about)
//! - [Features](#features)
//! - [Installing](#installing)
//! - [Example](#example)
//! - [Using](#using)
//!   - [... in libraries](#-in-libraries)
//!   - [... in application code](#-in-application-code)
//!   - [... in `main()`](#-in-main)
//!   - [... diagnostic code URLs](#-diagnostic-code-urls)
//!   - [... snippets](#-snippets)
//!   - [... help text](#-help-text)
//!   - [... severity level](#-severity-level)
//!   - [... multiple related errors](#-multiple-related-errors)
//!   - [... delayed source code](#-delayed-source-code)
//!   - [... handler options](#-handler-options)
//!   - [... dynamic diagnostics](#-dynamic-diagnostics)
//!   - [... syntax highlighting](#-syntax-highlighting)
//!   - [... collection of labels](#-collection-of-labels)
//! - [Acknowledgements](#acknowledgements)
//! - [License](#license)
//!
//! ## Features
//!
//! - Generic [`Diagnostic`] protocol, compatible (and dependent on)
//!   [`std::error::Error`].
//! - Unique error codes on every [`Diagnostic`].
//! - Custom links to get more details on error codes.
//! - Super handy derive macro for defining diagnostic metadata.
//! - Replacements for [`anyhow`](https://docs.rs/anyhow)/[`eyre`](https://docs.rs/eyre)
//!   types [`Result`], [`Report`] and the [`miette!`] macro for the
//!   `anyhow!`/`eyre!` macros.
//! - Generic support for arbitrary [`SourceCode`]s for snippet data, with
//!   default support for `String`s included.
//!
//! The `miette` crate also comes bundled with a default [`ReportHandler`] with
//! the following features:
//!
//! - Fancy graphical [diagnostic output](#about), using ANSI/Unicode text
//! - single- and multi-line highlighting support
//! - Screen reader/braille support, gated on [`NO_COLOR`](http://no-color.org/),
//!   and other heuristics.
//! - Fully customizable graphical theming (or overriding the printers
//!   entirely).
//! - Cause chain printing
//! - Turns diagnostic codes into links in [supported terminals](https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda).
//!
//! ## Installing
//!
//! ```sh
//! $ cargo add miette
//! ```
//!
//! If you want to use the fancy printer in all these screenshots:
//!
//! ```sh
//! $ cargo add miette --features fancy
//! ```
//!
//! ## Example
//!
//! ```rust
//! /*
//! You can derive a `Diagnostic` from any `std::error::Error` type.
//!
//! `thiserror` is a great way to define them, and plays nicely with `miette`!
//! */
//! use miette::{Diagnostic, SourceSpan};
//! use thiserror::Error;
//!
//! #[derive(Error, Debug, Diagnostic)]
//! #[error("oops!")]
//! #[diagnostic(
//!     code(oops::my::bad),
//!     url(docsrs),
//!     help("try doing it better next time?")
//! )]
//! struct MyBad {
//!     // The Source that we're gonna be printing snippets out of.
//!     // This can be a String if you don't have or care about file names.
//!     #[source_code]
//!     src: NamedSource<String>,
//!     // Snippets and highlights can be included in the diagnostic!
//!     #[label("This bit here")]
//!     bad_bit: SourceSpan,
//! }
//!
//! /*
//! Now let's define a function!
//!
//! Use this `Result` type (or its expanded version) as the return type
//! throughout your app (but NOT your libraries! Those should always return
//! concrete types!).
//! */
//! use miette::{NamedSource, Result};
//! fn this_fails() -> Result<()> {
//!     // You can use plain strings as a `Source`, or anything that implements
//!     // the one-method `Source` trait.
//!     let src = "source\n  text\n    here".to_string();
//!     let len = src.len();
//!
//!     Err(MyBad {
//!         src: NamedSource::new("bad_file.rs", src),
//!         bad_bit: (9, 4).into(),
//!     })?;
//!
//!     Ok(())
//! }
//!
//! /*
//! Now to get everything printed nicely, just return a `Result<()>`
//! and you're all set!
//!
//! Note: You can swap out the default reporter for a custom one using
//! `miette::set_hook()`
//! */
//! fn pretend_this_is_main() -> Result<()> {
//!     // kaboom~
//!     this_fails()?;
//!
//!     Ok(())
//! }
//! ```
//!
//! And this is the output you'll get if you run this program:
//!
//! <img src="https://raw.githubusercontent.com/zkat/miette/main/images/single-line-example.png" alt="
//! Narratable printout:
//! \
//! Error: Types mismatched for operation.
//!     Diagnostic severity: error
//! Begin snippet starting at line 1, column 1
//! \
//! snippet line 1: 3 + &quot;5&quot;
//!     label starting at line 1, column 1: int
//!     label starting at line 1, column 1: doesn't support these values.
//!     label starting at line 1, column 1: string
//! diagnostic help: Change int or string to be the right types and try again.
//! diagnostic code: nu::parser::unsupported_operation
//! For more details, see https://docs.rs/nu-parser/0.1.0/nu-parser/enum.ParseError.html#variant.UnsupportedOperation">
//!
//! ## Using
//!
//! ### ... in libraries
//!
//! `miette` is _fully compatible_ with library usage. Consumers who don't know
//! about, or don't want, `miette` features can safely use its error types as
//! regular [`std::error::Error`].
//!
//! We highly recommend using something like [`thiserror`](https://docs.rs/thiserror)
//! to define unique error types and error wrappers for your library.
//!
//! While `miette` integrates smoothly with `thiserror`, it is _not required_.
//! If you don't want to use the [`Diagnostic`] derive macro, you can implement
//! the trait directly, just like with `std::error::Error`.
//!
//! ```rust
//! // lib/error.rs
//! use miette::{Diagnostic, SourceSpan};
//! use thiserror::Error;
//!
//! #[derive(Error, Diagnostic, Debug)]
//! pub enum MyLibError {
//!     #[error(transparent)]
//!     #[diagnostic(code(my_lib::io_error))]
//!     IoError(#[from] std::io::Error),
//!
//!     #[error("Oops it blew up")]
//!     #[diagnostic(code(my_lib::bad_code))]
//!     BadThingHappened,
//!
//!     #[error(transparent)]
//!     // Use `#[diagnostic(transparent)]` to wrap another [`Diagnostic`]. You won't see labels otherwise
//!     #[diagnostic(transparent)]
//!     AnotherError(#[from] AnotherError),
//! }
//!
//! #[derive(Error, Diagnostic, Debug)]
//! #[error("another error")]
//! pub struct AnotherError {
//!    #[label("here")]
//!    pub at: SourceSpan
//! }
//! ```
//!
//! Then, return this error type from all your fallible public APIs. It's a best
//! practice to wrap any "external" error types in your error `enum` instead of
//! using something like [`Report`] in a library.
//!
//! ### ... in application code
//!
//! Application code tends to work a little differently than libraries. You
//! don't always need or care to define dedicated error wrappers for errors
//! coming from external libraries and tools.
//!
//! For this situation, `miette` includes two tools: [`Report`] and
//! [`IntoDiagnostic`]. They work in tandem to make it easy to convert regular
//! `std::error::Error`s into [`Diagnostic`]s. Additionally, there's a
//! [`Result`] type alias that you can use to be more terse.
//!
//! When dealing with non-`Diagnostic` types, you'll want to
//! `.into_diagnostic()` them:
//!
//! ```rust
//! // my_app/lib/my_internal_file.rs
//! use miette::{IntoDiagnostic, Result};
//! use semver::Version;
//!
//! pub fn some_tool() -> Result<Version> {
//!     Ok("1.2.x".parse().into_diagnostic()?)
//! }
//! ```
//!
//! `miette` also includes an `anyhow`/`eyre`-style `Context`/`WrapErr` traits
//! that you can import to add ad-hoc context messages to your `Diagnostic`s, as
//! well, though you'll still need to use `.into_diagnostic()` to make use of
//! it:
//!
//! ```rust
//! // my_app/lib/my_internal_file.rs
//! use miette::{IntoDiagnostic, Result, WrapErr};
//! use semver::Version;
//!
//! pub fn some_tool() -> Result<Version> {
//!     Ok("1.2.x"
//!         .parse()
//!         .into_diagnostic()
//!         .wrap_err("Parsing this tool's semver version failed.")?)
//! }
//! ```
//!
//! To construct your own simple adhoc error use the [miette!] macro:
//! ```rust
//! // my_app/lib/my_internal_file.rs
//! use miette::{miette, IntoDiagnostic, Result, WrapErr};
//! use semver::Version;
//!
//! pub fn some_tool() -> Result<Version> {
//!     let version = "1.2.x";
//!     Ok(version
//!         .parse()
//!         .map_err(|_| miette!("Invalid version {}", version))?)
//! }
//! ```
//! There are also similar [bail!] and [ensure!] macros.
//!
//! ### ... in `main()`
//!
//! `main()` is just like any other part of your application-internal code. Use
//! `Result` as your return value, and it will pretty-print your diagnostics
//! automatically.
//!
//! > **NOTE:** You must enable the `"fancy"` crate feature to get fancy report
//! output like in the screenshots here.** You should only do this in your
//! toplevel crate, as the fancy feature pulls in a number of dependencies that
//! libraries and such might not want.
//!
//! ```rust
//! use miette::{IntoDiagnostic, Result};
//! use semver::Version;
//!
//! fn pretend_this_is_main() -> Result<()> {
//!     let version: Version = "1.2.x".parse().into_diagnostic()?;
//!     println!("{}", version);
//!     Ok(())
//! }
//! ```
//!
//! Please note: in order to get fancy diagnostic rendering with all the pretty
//! colors and arrows, you should install `miette` with the `fancy` feature
//! enabled:
//!
//! ```toml
//! miette = { version = "X.Y.Z", features = ["fancy"] }
//! ```
//!
//! Another way to display a diagnostic is by printing them using the debug formatter.
//! This is, in fact, what returning diagnostics from main ends up doing.
//! To do it yourself, you can write the following:
//!
//! ```rust
//! use miette::{IntoDiagnostic, Result};
//! use semver::Version;
//!
//! fn just_a_random_function() {
//!     let version_result: Result<Version> = "1.2.x".parse().into_diagnostic();
//!     match version_result {
//!         Err(e) => println!("{:?}", e),
//!         Ok(version) => println!("{}", version),
//!     }
//! }
//! ```
//!
//! ### ... diagnostic code URLs
//!
//! `miette` supports providing a URL for individual diagnostics. This URL will
//! be displayed as an actual link in supported terminals, like so:
//!
//! <img
//! src="https://raw.githubusercontent.com/zkat/miette/main/images/code_linking.png"
//! alt=" Example showing the graphical report printer for miette
//! pretty-printing an error code. The code is underlined and followed by text
//! saying to 'click here'. A hover tooltip shows a full-fledged URL that can be
//! Ctrl+Clicked to open in a browser.
//! \
//! This feature is also available in the narratable printer. It will add a line
//! after printing the error code showing a plain URL that you can visit.
//! ">
//!
//! To use this, you can add a `url()` sub-param to your `#[diagnostic]`
//! attribute:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Error, Diagnostic, Debug)]
//! #[error("kaboom")]
//! #[diagnostic(
//!     code(my_app::my_error),
//!     // You can do formatting!
//!     url("https://my_website.com/error_codes#{}", self.code().unwrap())
//! )]
//! struct MyErr;
//! ```
//!
//! Additionally, if you're developing a library and your error type is exported
//! from your crate's top level, you can use a special `url(docsrs)` option
//! instead of manually constructing the URL. This will automatically create a
//! link to this diagnostic on `docs.rs`, so folks can just go straight to your
//! (very high quality and detailed!) documentation on this diagnostic:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Error, Diagnostic, Debug)]
//! #[diagnostic(
//!     code(my_app::my_error),
//!     // Will link users to https://docs.rs/my_crate/0.0.0/my_crate/struct.MyErr.html
//!     url(docsrs)
//! )]
//! #[error("kaboom")]
//! struct MyErr;
//! ```
//!
//! ### ... snippets
//!
//! Along with its general error handling and reporting features, `miette` also
//! includes facilities for adding error spans/annotations/labels to your
//! output. This can be very useful when an error is syntax-related, but you can
//! even use it to print out sections of your own source code!
//!
//! To achieve this, `miette` defines its own lightweight [`SourceSpan`] type.
//! This is a basic byte-offset and length into an associated [`SourceCode`]
//! and, along with the latter, gives `miette` all the information it needs to
//! pretty-print some snippets! You can also use your own `Into<SourceSpan>`
//! types as label spans.
//!
//! The easiest way to define errors like this is to use the
//! `derive(Diagnostic)` macro:
//!
//! ```rust
//! use miette::{Diagnostic, SourceSpan};
//! use thiserror::Error;
//!
//! #[derive(Diagnostic, Debug, Error)]
//! #[error("oops")]
//! #[diagnostic(code(my_lib::random_error))]
//! pub struct MyErrorType {
//!     // The `Source` that miette will use.
//!     #[source_code]
//!     src: String,
//!
//!     // This will underline/mark the specific code inside the larger
//!     // snippet context.
//!     #[label = "This is the highlight"]
//!     err_span: SourceSpan,
//!
//!     // You can add as many labels as you want.
//!     // They'll be rendered sequentially.
//!     #[label("This is bad")]
//!     snip2: (usize, usize), // `(usize, usize)` is `Into<SourceSpan>`!
//!
//!     // Snippets can be optional, by using Option:
//!     #[label("some text")]
//!     snip3: Option<SourceSpan>,
//!
//!     // with or without label text
//!     #[label]
//!     snip4: Option<SourceSpan>,
//! }
//! ```
//!
//! ### ... help text
//! `miette` provides two facilities for supplying help text for your errors:
//!
//! The first is the `#[help()]` format attribute that applies to structs or
//! enum variants:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("welp")]
//! #[diagnostic(help("try doing this instead"))]
//! struct Foo;
//! ```
//!
//! The other is by programmatically supplying the help text as a field to
//! your diagnostic:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("welp")]
//! #[diagnostic()]
//! struct Foo {
//!     #[help]
//!     advice: Option<String>, // Can also just be `String`
//! }
//!
//! let err = Foo {
//!     advice: Some("try doing this instead".to_string()),
//! };
//! ```
//!
//! ### ... severity level
//! `miette` provides a way to set the severity level of a diagnostic.
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("welp")]
//! #[diagnostic(severity(Warning))]
//! struct Foo;
//! ```
//!
//! ### ... multiple related errors
//!
//! `miette` supports collecting multiple errors into a single diagnostic, and
//! printing them all together nicely.
//!
//! To do so, use the `#[related]` tag on any `IntoIter` field in your
//! `Diagnostic` type:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Debug, Error, Diagnostic)]
//! #[error("oops")]
//! struct MyError {
//!     #[related]
//!     others: Vec<MyError>,
//! }
//! ```
//!
//! ### ... delayed source code
//!
//! Sometimes it makes sense to add source code to the error message later.
//! One option is to use [`with_source_code()`](Report::with_source_code)
//! method for that:
//!
//! ```rust,no_run
//! use miette::{Diagnostic, SourceSpan};
//! use thiserror::Error;
//!
//! #[derive(Diagnostic, Debug, Error)]
//! #[error("oops")]
//! #[diagnostic()]
//! pub struct MyErrorType {
//!     // Note: label but no source code
//!     #[label]
//!     err_span: SourceSpan,
//! }
//!
//! fn do_something() -> miette::Result<()> {
//!     // This function emits actual error with label
//!     return Err(MyErrorType {
//!         err_span: (7..11).into(),
//!     })?;
//! }
//!
//! fn main() -> miette::Result<()> {
//!     do_something().map_err(|error| {
//!         // And this code provides the source code for inner error
//!         error.with_source_code(String::from("source code"))
//!     })
//! }
//! ```
//!
//! Also source code can be provided by a wrapper type. This is especially
//! useful in combination with `related`, when multiple errors should be
//! emitted at the same time:
//!
//! ```rust,no_run
//! use miette::{Diagnostic, Report, SourceSpan};
//! use thiserror::Error;
//!
//! #[derive(Diagnostic, Debug, Error)]
//! #[error("oops")]
//! #[diagnostic()]
//! pub struct InnerError {
//!     // Note: label but no source code
//!     #[label]
//!     err_span: SourceSpan,
//! }
//!
//! #[derive(Diagnostic, Debug, Error)]
//! #[error("oops: multiple errors")]
//! #[diagnostic()]
//! pub struct MultiError {
//!     // Note source code by no labels
//!     #[source_code]
//!     source_code: String,
//!     // The source code above is used for these errors
//!     #[related]
//!     related: Vec<InnerError>,
//! }
//!
//! fn do_something() -> Result<(), Vec<InnerError>> {
//!     Err(vec![
//!         InnerError {
//!             err_span: (0..6).into(),
//!         },
//!         InnerError {
//!             err_span: (7..11).into(),
//!         },
//!     ])
//! }
//!
//! fn main() -> miette::Result<()> {
//!     do_something().map_err(|err_list| MultiError {
//!         source_code: "source code".into(),
//!         related: err_list,
//!     })?;
//!     Ok(())
//! }
//! ```
//!
//! ### ... Diagnostic-based error sources.
//!
//! When one uses the `#[source]` attribute on a field, that usually comes
//! from `thiserror`, and implements a method for
//! [`std::error::Error::source`]. This works in many cases, but it's lossy:
//! if the source of the diagnostic is a diagnostic itself, the source will
//! simply be treated as an `std::error::Error`.
//!
//! While this has no effect on the existing _reporters_, since they don't use
//! that information right now, APIs who might want this information will have
//! no access to it.
//!
//! If it's important for you for this information to be available to users,
//! you can use `#[diagnostic_source]` alongside `#[source]`. Not that you
//! will likely want to use _both_:
//!
//! ```rust
//! use miette::Diagnostic;
//! use thiserror::Error;
//!
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("MyError")]
//! struct MyError {
//!     #[source]
//!     #[diagnostic_source]
//!     the_cause: OtherError,
//! }
//!
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("OtherError")]
//! struct OtherError;
//! ```
//!
//! ### ... handler options
//!
//! [`MietteHandler`] is the default handler, and is very customizable. In
//! most cases, you can simply use [`MietteHandlerOpts`] to tweak its behavior
//! instead of falling back to your own custom handler.
//!
//! Usage is like so:
//!
//! ```rust,ignore
//! miette::set_hook(Box::new(|_| {
//!     Box::new(
//!         miette::MietteHandlerOpts::new()
//!             .terminal_links(true)
//!             .unicode(false)
//!             .context_lines(3)
//!             .tab_width(4)
//!             .break_words(true)
//!             .build(),
//!     )
//! }))
//!
//! # .unwrap()
//! ```
//!
//! See the docs for [`MietteHandlerOpts`] for more details on what you can
//! customize!
//!
//! ### ... dynamic diagnostics
//!
//! If you...
//! - ...don't know all the possible errors upfront
//! - ...need to serialize/deserialize errors
//! then you may want to use [`miette!`], [`diagnostic!`] macros or
//! [`MietteDiagnostic`] directly to create diagnostic on the fly.
//!
//! ```rust,ignore
//! # use miette::{miette, LabeledSpan, Report};
//!
//! let source = "2 + 2 * 2 = 8".to_string();
//! let report = miette!(
//!   labels = vec![
//!       LabeledSpan::at(12..13, "this should be 6"),
//!   ],
//!   help = "'*' has greater precedence than '+'",
//!   "Wrong answer"
//! ).with_source_code(source);
//! println!("{:?}", report)
//! ```
//!
//! ### ... syntax highlighting
//!
//! `miette` can be configured to highlight syntax in source code snippets.
//!
//! <!-- TODO: screenshot goes here once default Theme is decided -->
//!
//! To use the built-in highlighting functionality, you must enable the
//! `syntect-highlighter` crate feature. When this feature is enabled, `miette` will
//! automatically use the [`syntect`] crate to highlight the `#[source_code]`
//! field of your [`Diagnostic`].
//!
//! Syntax detection with [`syntect`] is handled by checking 2 methods on the [`SpanContents`] trait, in order:
//! * [language()](SpanContents::language) - Provides the name of the language
//!   as a string. For example `"Rust"` will indicate Rust syntax highlighting.
//!   You can set the language of the [`SpanContents`] produced by a
//!   [`NamedSource`] via the [`with_language`](NamedSource::with_language)
//!   method.
//! * [name()](SpanContents::name) - In the absence of an explicitly set
//!   language, the name is assumed to contain a file name or file path.
//!   The highlighter will check for a file extension at the end of the name and
//!   try to guess the syntax from that.
//!
//! If you want to use a custom highlighter, you can provide a custom
//! implementation of the [`Highlighter`](highlighters::Highlighter)
//! trait to [`MietteHandlerOpts`] by calling the
//! [`with_syntax_highlighting`](MietteHandlerOpts::with_syntax_highlighting)
//! method. See the [`highlighters`] module docs for more details.
//!
//! ### ... collection of labels
//!
//! When the number of labels is unknown, you can use a collection of `SourceSpan`
//! (or any type convertible into `SourceSpan`). For this, add the `collection`
//! parameter to `label` and use any type than can be iterated over for the field.
//!
//! ```rust,ignore
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("oops!")]
//! struct MyError {
//!     #[label("main issue")]
//!     primary_span: SourceSpan,
//!
//!     #[label(collection, "related to this")]
//!     other_spans: Vec<Range<usize>>,
//! }
//!
//! let report: miette::Report = MyError {
//!     primary_span: (6, 9).into(),
//!     other_spans: vec![19..26, 30..41],
//! }.into();
//!
//! println!("{:?}", report.with_source_code("About something or another or yet another ...".to_string()));
//! ```
//!
//! A collection can also be of `LabeledSpan` if you want to have different text
//! for different labels. Labels with no text will use the one from the `label`
//! attribute
//!
//! ```rust,ignore
//! #[derive(Debug, Diagnostic, Error)]
//! #[error("oops!")]
//! struct MyError {
//!     #[label("main issue")]
//!     primary_span: SourceSpan,
//!
//!     #[label(collection, "related to this")]
//!     other_spans: Vec<LabeledSpan>, // LabeledSpan
//! }
//!
//! let report: miette::Report = MyError {
//!     primary_span: (6, 9).into(),
//!     other_spans: vec![
//!         LabeledSpan::new(None, 19, 7), // Use default text `related to this`
//!         LabeledSpan::new(Some("and also this".to_string()), 30, 11), // Use specific text
//!     ],
//! }.into();
//!
//! println!("{:?}", report.with_source_code("About something or another or yet another ...".to_string()));
//! ```
//!
//! ## MSRV
//!
//! This crate requires rustc 1.70.0 or later.
//!
//! ## Acknowledgements
//!
//! `miette` was not developed in a void. It owes enormous credit to various
//! other projects and their authors:
//!
//! - [`anyhow`](http://crates.io/crates/anyhow) and [`color-eyre`](https://crates.io/crates/color-eyre):
//!   these two enormously influential error handling libraries have pushed
//!   forward the experience of application-level error handling and error
//!   reporting. `miette`'s `Report` type is an attempt at a very very rough
//!   version of their `Report` types.
//! - [`thiserror`](https://crates.io/crates/thiserror) for setting the standard
//!   for library-level error definitions, and for being the inspiration behind
//!   `miette`'s derive macro.
//! - `rustc` and [@estebank](https://github.com/estebank) for their
//!   state-of-the-art work in compiler diagnostics.
//! - [`ariadne`](https://crates.io/crates/ariadne) for pushing forward how
//!   _pretty_ these diagnostics can really look!
//!
//! ## License
//!
//! `miette` is released to the Rust community under the [Apache license
//! 2.0](./LICENSE).
//!
//! It also includes code taken from [`eyre`](https://github.com/yaahc/eyre),
//! and some from [`thiserror`](https://github.com/dtolnay/thiserror), also
//! under the Apache License. Some code is taken from
//! [`ariadne`](https://github.com/zesterer/ariadne), which is MIT licensed.
#[cfg(feature = "derive")]
pub use miette_derive::*;

pub use error::*;
pub use eyreish::*;
#[cfg(feature = "fancy-base")]
pub use handler::*;
pub use handlers::*;
pub use miette_diagnostic::*;
pub use named_source::*;
#[cfg(feature = "fancy")]
pub use panic::*;
pub use protocol::*;

mod chain;
mod diagnostic_chain;
mod error;
mod eyreish;
#[cfg(feature = "fancy-base")]
mod handler;
mod handlers;
#[cfg(feature = "fancy-base")]
pub mod highlighters;
#[doc(hidden)]
pub mod macro_helpers;
mod miette_diagnostic;
mod named_source;
#[cfg(feature = "fancy")]
mod panic;
mod protocol;
mod source_impls;