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//! An error report handler for panics and the [`eyre`] crate for colorful, consistent, and well //! formatted error reports for all kinds of errors. //! //! ## TLDR //! //! `color_eyre` helps you build error reports that look like this: //! //! <pre><span style="color: #06989A"><b>color-eyre</b></span> on <span style="color: #75507B"><b> hooked</b></span> <span style="color: #CC0000"><b>[$!] </b></span>is <span style="color: #FF8700"><b>📦 v0.5.0</b></span> via <span style="color: #CC0000"><b>🦀 v1.44.0</b></span> //! <span style="color: #4E9A06"><b>❯</b></span> cargo run --example custom_section //! <span style="color: #4E9A06"><b> Finished</b></span> dev [unoptimized + debuginfo] target(s) in 0.04s //! <span style="color: #4E9A06"><b> Running</b></span> `target/debug/examples/custom_section` //! Error: //! 0: <span style="color: #F15D22">Unable to read config</span> //! 1: <span style="color: #F15D22">cmd exited with non-zero status code</span> //! //! Stderr: //! cat: fake_file: No such file or directory //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! //! 0: <span style="color: #F15D22">custom_section::output2</span> with <span style="color: #34E2E2">self="cat" "fake_file"</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">14</span> //! 1: <span style="color: #F15D22">custom_section::read_file</span> with <span style="color: #34E2E2">path="fake_file"</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">58</span> //! 2: <span style="color: #F15D22">custom_section::read_config</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">63</span> //! //! <span style="color: #34E2E2">Suggestion</span>: try using a file that exists next time</pre> //! //! ## Setup //! //! Add the following to your toml file: //! //! ```toml //! [dependencies] //! color-eyre = "0.5" //! ``` //! //! And install the panic and error report handlers: //! //! ```rust //! use color_eyre::eyre::Result; //! //! fn main() -> Result<()> { //! color_eyre::install()?; //! //! // ... //! # Ok(()) //! } //! ``` //! //! ### Disabling tracing support //! //! If you don't plan on using `tracing_error` and `SpanTrace` you can disable the //! tracing integration to cut down on unused dependencies: //! //! ```toml //! [dependencies] //! color-eyre = { version = "0.5", default-features = false } //! ``` //! //! ### Disabling SpanTrace capture by default //! //! color-eyre defaults to capturing span traces. This is because `SpanTrace` //! capture is significantly cheaper than `Backtrace` capture. However, like //! backtraces, span traces are most useful for debugging applications, and it's //! not uncommon to want to disable span trace capture by default to keep noise out //! developer. //! //! To disable span trace capture you must explicitly set one of the env variables //! that regulate `SpanTrace` capture to `"0"`: //! //! ```rust //! if std::env::var("RUST_SPANTRACE").is_err() { //! std::env::set_var("RUST_SPANTRACE", "0"); //! } //! ``` //! //! ### Improving perf on debug builds //! //! In debug mode `color-eyre` behaves noticably worse than `eyre`. This is caused //! by the fact that `eyre` uses `std::backtrace::Backtrace` instead of //! `backtrace::Backtrace`. The std version of backtrace is precompiled with //! optimizations, this means that whether or not you're in debug mode doesn't //! matter much for how expensive backtrace capture is, it will always be in the //! 10s of milliseconds to capture. A debug version of `backtrace::Backtrace` //! however isn't so lucky, and can take an order of magnitude more time to capture //! a backtrace compared to its std counterpart. //! //! Cargo [profile //! overrides](https://doc.rust-lang.org/cargo/reference/profiles.html#overrides) //! can be used to mitigate this problem. By configuring your project to always //! build `backtrace` with optimizations you should get the same performance from //! `color-eyre` that you're used to with `eyre`. To do so add the following to //! your Cargo.toml: //! //! ```toml //! [profile.dev.package.backtrace] //! opt-level = 3 //! ``` //! //! ## Features //! //! ### Multiple report format verbosity levels //! //! `color-eyre` provides 3 different report formats for how it formats the captured `SpanTrace` //! and `Backtrace`, minimal, short, and full. Take the below snippets of the output produced by [`examples/usage.rs`]: //! //! --- //! //! Running `cargo run --example usage` without `RUST_LIB_BACKTRACE` set will produce a minimal //! report like this: //! //! <pre><span style="color: #06989A"><b>color-eyre</b></span> on <span style="color: #75507B"><b> hooked</b></span> <span style="color: #CC0000"><b>[$!] </b></span>is <span style="color: #FF8700"><b>📦 v0.5.0</b></span> via <span style="color: #CC0000"><b>🦀 v1.44.0</b></span> took <span style="color: #C4A000"><b>2s</b></span> //! <span style="color: #CC0000"><b>❯</b></span> cargo run --example usage //! <span style="color: #4E9A06"><b> Finished</b></span> dev [unoptimized + debuginfo] target(s) in 0.04s //! <span style="color: #4E9A06"><b> Running</b></span> `target/debug/examples/usage` //! <span style="color: #A1A1A1">Jul 05 19:15:58.026 </span><span style="color: #4E9A06"> INFO</span> <b>read_config</b>:<b>read_file{</b>path="fake_file"<b>}</b>: Reading file //! Error: //! 0: <span style="color: #F15D22">Unable to read config</span> //! 1: <span style="color: #F15D22">No such file or directory (os error 2)</span> //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! //! 0: <span style="color: #F15D22">usage::read_file</span> with <span style="color: #34E2E2">path="fake_file"</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">32</span> //! 1: <span style="color: #F15D22">usage::read_config</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">38</span> //! //! <span style="color: #34E2E2">Suggestion</span>: try using a file that exists next time</pre> //! //! <br> //! //! Running `RUST_LIB_BACKTRACE=1 cargo run --example usage` tells `color-eyre` to use the short //! format, which additionally capture a [`backtrace::Backtrace`]: //! //! <pre><span style="color: #06989A"><b>color-eyre</b></span> on <span style="color: #75507B"><b> hooked</b></span> <span style="color: #CC0000"><b>[$!] </b></span>is <span style="color: #FF8700"><b>📦 v0.5.0</b></span> via <span style="color: #CC0000"><b>🦀 v1.44.0</b></span> //! <span style="color: #CC0000"><b>❯</b></span> RUST_LIB_BACKTRACE=1 cargo run --example usage //! <span style="color: #4E9A06"><b> Finished</b></span> dev [unoptimized + debuginfo] target(s) in 0.04s //! <span style="color: #4E9A06"><b> Running</b></span> `target/debug/examples/usage` //! <span style="color: #A1A1A1">Jul 05 19:16:02.853 </span><span style="color: #4E9A06"> INFO</span> <b>read_config</b>:<b>read_file{</b>path="fake_file"<b>}</b>: Reading file //! Error: //! 0: <span style="color: #F15D22">Unable to read config</span> //! 1: <span style="color: #F15D22">No such file or directory (os error 2)</span> //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! //! 0: <span style="color: #F15D22">usage::read_file</span> with <span style="color: #34E2E2">path="fake_file"</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">32</span> //! 1: <span style="color: #F15D22">usage::read_config</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">38</span> //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! <span style="color: #34E2E2"> ⋮ 5 frames hidden ⋮ </span> //! 6: <span style="color: #F15D22">usage::read_file</span><span style="color: #88807C">::haee210cb22460af3</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">35</span> //! 7: <span style="color: #F15D22">usage::read_config</span><span style="color: #88807C">::ha649ef4ec333524d</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">40</span> //! 8: <span style="color: #F15D22">usage::main</span><span style="color: #88807C">::hbe443b50eac38236</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">11</span> //! <span style="color: #34E2E2"> ⋮ 10 frames hidden ⋮ </span> //! //! <span style="color: #34E2E2">Suggestion</span>: try using a file that exists next time</pre> //! //! <br> //! //! Finally, running `RUST_LIB_BACKTRACE=full cargo run --example usage` tells `color-eyre` to use //! the full format, which in addition to the above will attempt to include source lines where the //! error originated from, assuming it can find them on the disk. //! //! <pre><span style="color: #06989A"><b>color-eyre</b></span> on <span style="color: #75507B"><b> hooked</b></span> <span style="color: #CC0000"><b>[$!] </b></span>is <span style="color: #FF8700"><b>📦 v0.5.0</b></span> via <span style="color: #CC0000"><b>🦀 v1.44.0</b></span> //! <span style="color: #CC0000"><b>❯</b></span> RUST_LIB_BACKTRACE=full cargo run --example usage //! <span style="color: #4E9A06"><b> Finished</b></span> dev [unoptimized + debuginfo] target(s) in 0.05s //! <span style="color: #4E9A06"><b> Running</b></span> `target/debug/examples/usage` //! <span style="color: #A1A1A1">Jul 05 19:16:06.335 </span><span style="color: #4E9A06"> INFO</span> <b>read_config</b>:<b>read_file{</b>path="fake_file"<b>}</b>: Reading file //! Error: //! 0: <span style="color: #F15D22">Unable to read config</span> //! 1: <span style="color: #F15D22">No such file or directory (os error 2)</span> //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! //! 0: <span style="color: #F15D22">usage::read_file</span> with <span style="color: #34E2E2">path="fake_file"</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">32</span> //! 30 │ } //! 31 │ //! <b> 32 > #[instrument]</b> //! 33 │ fn read_file(path: &str) -> Result<(), Report> { //! 34 │ info!("Reading file"); //! 1: <span style="color: #F15D22">usage::read_config</span> //! at <span style="color: #75507B">examples/usage.rs</span>:<span style="color: #75507B">38</span> //! 36 │ } //! 37 │ //! <b> 38 > #[instrument]</b> //! 39 │ fn read_config() -> Result<(), Report> { //! 40 │ read_file("fake_file") //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! <span style="color: #34E2E2"> ⋮ 5 frames hidden ⋮ </span> //! 6: <span style="color: #F15D22">usage::read_file</span><span style="color: #88807C">::haee210cb22460af3</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">35</span> //! 33 │ fn read_file(path: &str) -> Result<(), Report> { //! 34 │ info!("Reading file"); //! <span style="color: #D3D7CF"><b> 35 > Ok(std::fs::read_to_string(path).map(drop)?)</b></span> //! 36 │ } //! 37 │ //! 7: <span style="color: #F15D22">usage::read_config</span><span style="color: #88807C">::ha649ef4ec333524d</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">40</span> //! 38 │ #[instrument] //! 39 │ fn read_config() -> Result<(), Report> { //! <span style="color: #D3D7CF"><b> 40 > read_file("fake_file")</b></span> //! 41 │ .wrap_err("Unable to read config") //! 42 │ .suggestion("try using a file that exists next time") //! 8: <span style="color: #F15D22">usage::main</span><span style="color: #88807C">::hbe443b50eac38236</span> //! at <span style="color: #75507B">/home/jlusby/git/yaahc/color-eyre/examples/usage.rs</span>:<span style="color: #75507B">11</span> //! 9 │ color_eyre::install()?; //! 10 │ //! <span style="color: #D3D7CF"><b> 11 > Ok(read_config()?)</b></span> //! 12 │ } //! 13 │ //! <span style="color: #34E2E2"> ⋮ 10 frames hidden ⋮ </span> //! //! <span style="color: #34E2E2">Suggestion</span>: try using a file that exists next time</pre> //! //! ### Custom `Section`s for error reports via [`Help`] trait //! //! The `section` module provides helpers for adding extra sections to error //! reports. Sections are disinct from error messages and are displayed //! independently from the chain of errors. Take this example of adding sections //! to contain `stderr` and `stdout` from a failed command, taken from //! [`examples/custom_section.rs`]: //! //! ```rust //! use color_eyre::{eyre::eyre, SectionExt, Help, eyre::Report}; //! use std::process::Command; //! use tracing::instrument; //! //! trait Output { //! fn output2(&mut self) -> Result<String, Report>; //! } //! //! impl Output for Command { //! #[instrument] //! fn output2(&mut self) -> Result<String, Report> { //! let output = self.output()?; //! //! let stdout = String::from_utf8_lossy(&output.stdout); //! //! if !output.status.success() { //! let stderr = String::from_utf8_lossy(&output.stderr); //! Err(eyre!("cmd exited with non-zero status code")) //! .with_section(move || stdout.trim().to_string().header("Stdout:")) //! .with_section(move || stderr.trim().to_string().header("Stderr:")) //! } else { //! Ok(stdout.into()) //! } //! } //! } //! ``` //! //! --- //! //! Here we have an function that, if the command exits unsuccessfully, creates a //! report indicating the failure and attaches two sections, one for `stdout` and //! one for `stderr`. //! //! Running `cargo run --example custom_section` shows us how these sections are //! included in the output: //! //! <pre><span style="color: #06989A"><b>color-eyre</b></span> on <span style="color: #75507B"><b> hooked</b></span> <span style="color: #CC0000"><b>[$!] </b></span>is <span style="color: #FF8700"><b>📦 v0.5.0</b></span> via <span style="color: #CC0000"><b>🦀 v1.44.0</b></span> took <span style="color: #C4A000"><b>2s</b></span> //! <span style="color: #CC0000"><b>❯</b></span> cargo run --example custom_section //! <span style="color: #4E9A06"><b> Finished</b></span> dev [unoptimized + debuginfo] target(s) in 0.04s //! <span style="color: #4E9A06"><b> Running</b></span> `target/debug/examples/custom_section` //! Error: //! 0: <span style="color: #F15D22">Unable to read config</span> //! 1: <span style="color: #F15D22">cmd exited with non-zero status code</span> //! //! Stderr: //! cat: fake_file: No such file or directory //! //! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ //! //! 0: <span style="color: #F15D22">custom_section::output2</span> with <span style="color: #34E2E2">self="cat" "fake_file"</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">14</span> //! 1: <span style="color: #F15D22">custom_section::read_file</span> with <span style="color: #34E2E2">path="fake_file"</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">58</span> //! 2: <span style="color: #F15D22">custom_section::read_config</span> //! at <span style="color: #75507B">examples/custom_section.rs</span>:<span style="color: #75507B">63</span> //! //! <span style="color: #34E2E2">Suggestion</span>: try using a file that exists next time</pre> //! //! Only the `Stderr:` section actually gets included. The `cat` command fails, //! so stdout ends up being empty and is skipped in the final report. This gives //! us a short and concise error report indicating exactly what was attempted and //! how it failed. //! //! ### Aggregating multiple errors into one report //! //! It's not uncommon for programs like batched task runners or parsers to want //! to return an error with multiple sources. The current version of the error //! trait does not support this use case very well, though there is [work being //! done](https://github.com/rust-lang/rfcs/pull/2895) to improve this. //! //! For now however one way to work around this is to compose errors outside the //! error trait. `color-eyre` supports such composition in its error reports via //! the `Help` trait. //! //! For an example of how to aggregate errors check out [`examples/multiple_errors.rs`]. //! //! ### Custom configuration for `color-backtrace` for setting custom filters and more //! //! The pretty printing for backtraces and span traces isn't actually provided by //! `color-eyre`, but instead comes from its dependencies [`color-backtrace`] and //! [`color-spantrace`]. `color-backtrace` in particular has many more features //! than are exported by `color-eyre`, such as customized color schemes, panic //! hooks, and custom frame filters. The custom frame filters are particularly //! useful when combined with `color-eyre`, so to enable their usage we provide //! the `install` fn for setting up a custom `BacktracePrinter` with custom //! filters installed. //! //! For an example of how to setup custom filters, check out [`examples/custom_filter.rs`]. //! //! [`eyre`]: https://docs.rs/eyre //! [`tracing-error`]: https://docs.rs/tracing-error //! [`color-backtrace`]: https://docs.rs/color-backtrace //! [`eyre::EyreHandler`]: https://docs.rs/eyre/*/eyre/trait.EyreHandler.html //! [`backtrace::Backtrace`]: https://docs.rs/backtrace/*/backtrace/struct.Backtrace.html //! [`tracing_error::SpanTrace`]: https://docs.rs/tracing-error/*/tracing_error/struct.SpanTrace.html //! [`color-spantrace`]: https://github.com/yaahc/color-spantrace //! [`Help`]: https://docs.rs/color-eyre/*/color_eyre/trait.Help.html //! [`eyre::Report`]: https://docs.rs/eyre/*/eyre/struct.Report.html //! [`eyre::Result`]: https://docs.rs/eyre/*/eyre/type.Result.html //! [`Handler`]: https://docs.rs/color-eyre/*/color_eyre/struct.Handler.html //! [`examples/usage.rs`]: https://github.com/yaahc/color-eyre/blob/master/examples/usage.rs //! [`examples/custom_filter.rs`]: https://github.com/yaahc/color-eyre/blob/master/examples/custom_filter.rs //! [`examples/custom_section.rs`]: https://github.com/yaahc/color-eyre/blob/master/examples/custom_section.rs //! [`examples/multiple_errors.rs`]: https://github.com/yaahc/color-eyre/blob/master/examples/multiple_errors.rs #![doc(html_root_url = "https://docs.rs/color-eyre/0.5.11")] #![cfg_attr(docsrs, feature(doc_cfg))] #![warn( missing_docs, missing_doc_code_examples, rust_2018_idioms, unreachable_pub, bad_style, const_err, dead_code, improper_ctypes, non_shorthand_field_patterns, no_mangle_generic_items, overflowing_literals, path_statements, patterns_in_fns_without_body, private_in_public, unconditional_recursion, unused, unused_allocation, unused_comparisons, unused_parens, while_true )] #![allow(clippy::try_err)] use std::sync::Arc; use backtrace::Backtrace; pub use eyre; #[doc(hidden)] pub use eyre::Report; #[doc(hidden)] pub use eyre::Result; pub use owo_colors; use section::help::HelpInfo; #[doc(hidden)] pub use section::Section as Help; pub use section::{IndentedSection, Section, SectionExt}; #[cfg(feature = "capture-spantrace")] use tracing_error::SpanTrace; #[doc(hidden)] pub use Handler as Context; pub mod config; mod fmt; mod handler; pub(crate) mod private; pub mod section; mod writers; /// A custom handler type for [`eyre::Report`] which provides colorful error /// reports and [`tracing-error`] support. /// /// # Details /// /// This type is not intended to be used directly, prefer using it via the /// [`color_eyre::Report`] and [`color_eyre::Result`] type aliases. /// /// [`eyre::Report`]: https://docs.rs/eyre/*/eyre/struct.Report.html /// [`tracing-error`]: https://docs.rs/tracing-error /// [`color_eyre::Report`]: type.Report.html /// [`color_eyre::Result`]: type.Result.html pub struct Handler { filters: Arc<[Box<config::FilterCallback>]>, backtrace: Option<Backtrace>, #[cfg(feature = "capture-spantrace")] span_trace: Option<SpanTrace>, sections: Vec<HelpInfo>, display_env_section: bool, #[cfg(feature = "issue-url")] issue_url: Option<String>, #[cfg(feature = "issue-url")] issue_metadata: std::sync::Arc<Vec<(String, Box<dyn std::fmt::Display + Send + Sync + 'static>)>>, #[cfg(feature = "issue-url")] issue_filter: std::sync::Arc<config::IssueFilterCallback>, theme: crate::config::Theme, #[cfg(feature = "track-caller")] location: Option<&'static std::panic::Location<'static>>, } /// The kind of type erased error being reported #[cfg(feature = "issue-url")] #[cfg_attr(docsrs, doc(cfg(feature = "issue-url")))] pub enum ErrorKind<'a> { /// A non recoverable error aka `panic!` NonRecoverable(&'a dyn std::any::Any), /// A recoverable error aka `impl std::error::Error` Recoverable(&'a (dyn std::error::Error + 'static)), } /// Install the default panic and error report hooks /// /// # Details /// /// This function must be called to enable the customization of `eyre::Report` /// provided by `color-eyre`. This function should be called early, ideally /// before any errors could be encountered. /// /// Only the first install will succeed. Calling this function after another /// report handler has been installed will cause an error. **Note**: This /// function _must_ be called before any `eyre::Report`s are constructed to /// prevent the default handler from being installed. /// /// Installing a global theme in `color_spantrace` manually (by calling /// `color_spantrace::set_theme` or `color_spantrace::colorize` before /// `install` is called) will result in an error if this function is called. /// /// # Examples /// /// ```rust /// use color_eyre::eyre::Result; /// /// fn main() -> Result<()> { /// color_eyre::install()?; /// /// // ... /// # Ok(()) /// } /// ``` pub fn install() -> Result<(), crate::eyre::Report> { config::HookBuilder::default().install() }