Support for custom styles

Cargo.toml

@@ -22,8 +22,8 @@ eyre = "0.6.1"
 tracing-error = { version = "0.1.2", optional = true }
 backtrace = { version = "0.3.48", features = ["gimli-symbolize"] }
 indenter = "0.3.0"
-owo-colors = "1.0.3"
-color-spantrace = { version = "0.1.4", optional = true }
+owo-colors = "1.2.0"
+color-spantrace = { version = "0.1.5", optional = true }
 once_cell = "1.4.0"
 url = { version = "2.1.1", optional = true }
 
@@ -32,6 +32,7 @@ tracing-subscriber = "0.2.5"
 tracing = "0.1.13"
 pretty_assertions = "0.6.1"
 thiserror = "1.0.19"
+ansi-parser = "0.6.5" # used for testing color schemes
 
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
 wasm-bindgen-test = "0.3.15"
@@ -75,4 +76,4 @@ exactly=1
 file="CHANGELOG.md"
 search="<!-- next-url -->"
 replace="<!-- next-url -->\n[Unreleased]: https://github.com/yaahc/{{crate_name}}/compare/{{tag_name}}...HEAD"
-exactly=1
+exactly=1

examples/theme.rs

@@ -0,0 +1,59 @@
+use color_eyre::{config::Theme, eyre::Report, owo_colors::style, Section};
+
+/// To experiment with theme values, edit `theme()` below and execute `cargo run --example theme`
+fn theme() -> Theme {
+    Theme::dark()
+        // ^ use `new` to derive from a blank theme, or `light` to derive from a light theme.
+        // Now configure your theme (see the docs for all options):
+        .line_number(style().blue())
+        .help_info_suggestion(style().red())
+}
+
+#[derive(Debug, thiserror::Error)]
+#[error("{0}")]
+struct TestError(&'static str);
+
+#[tracing::instrument]
+fn get_error(msg: &'static str) -> Report {
+    fn create_report(msg: &'static str) -> Report {
+        Report::msg(msg)
+            .note("note")
+            .warning("warning")
+            .suggestion("suggestion")
+            .error(TestError("error"))
+    }
+
+    // Using `Option` to add dependency code. See https://github.com/yaahc/color-eyre/blob/4ddaeb2126ed8b14e4e6aa03d7eef49eb8561cf0/src/config.rs#L56
+    None::<Option<()>>
+        .ok_or_else(|| create_report(msg))
+        .unwrap_err()
+}
+
+fn main() {
+    setup();
+    println!("{:?}", get_error("test"));
+}
+
+fn setup() {
+    use tracing_error::ErrorLayer;
+    use tracing_subscriber::prelude::*;
+    use tracing_subscriber::{fmt, EnvFilter};
+
+    std::env::set_var("RUST_LIB_BACKTRACE", "full");
+
+    let fmt_layer = fmt::layer().with_target(false);
+    let filter_layer = EnvFilter::try_from_default_env()
+        .or_else(|_| EnvFilter::try_new("info"))
+        .unwrap();
+
+    tracing_subscriber::registry()
+        .with(filter_layer)
+        .with(fmt_layer)
+        .with(ErrorLayer::default())
+        .init();
+
+    color_eyre::config::HookBuilder::new()
+        .theme(theme())
+        .install()
+        .expect("Failed to install `color_eyre`");
+}

examples/theme_test_helper.rs

@@ -0,0 +1,56 @@
+//! Nothing interesting here. This is just a small helper used in a test.
+
+//! This needs to be an "example" until binaries can declare separate dependencies (see https://github.com/rust-lang/cargo/issues/1982)
+
+//! See "tests/theme.rs" for more information.
+
+use color_eyre::{eyre::Report, Section};
+use tracing_error::ErrorLayer;
+use tracing_subscriber::prelude::*;
+use tracing_subscriber::{fmt, EnvFilter};
+
+#[rustfmt::skip]
+#[derive(Debug, thiserror::Error)]
+#[error("{0}")]
+struct TestError(&'static str);
+
+#[rustfmt::skip]
+#[tracing::instrument]
+fn get_error(msg: &'static str) -> Report {
+
+    #[rustfmt::skip]
+    #[inline(never)]
+    fn create_report(msg: &'static str) -> Report {
+        Report::msg(msg)
+            .note("note")
+            .warning("warning")
+            .suggestion("suggestion")
+            .error(TestError("error"))
+    }
+
+    // Getting regular `Report`. Using `Option` to trigger `is_dependency_code`. See https://github.com/yaahc/color-eyre/blob/4ddaeb2126ed8b14e4e6aa03d7eef49eb8561cf0/src/config.rs#L56
+    None::<Option<()>>.ok_or_else(|| create_report(msg)).unwrap_err()
+}
+
+fn main() {
+    setup();
+    let error = get_error("test");
+    panic!(error)
+}
+
+fn setup() {
+    std::env::set_var("RUST_LIB_BACKTRACE", "full");
+
+    let fmt_layer = fmt::layer().with_target(false);
+    let filter_layer = EnvFilter::try_from_default_env()
+        .or_else(|_| EnvFilter::try_new("info"))
+        .unwrap();
+
+    tracing_subscriber::registry()
+        .with(filter_layer)
+        .with(fmt_layer)
+        .with(ErrorLayer::default())
+        .init();
+
+    color_eyre::install().expect("Failed to install `color_eyre`");
+}