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Add option to show a callstack to the widget under the mouse
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,186 @@ | ||
| #[derive(Clone)] | ||
| struct Frame { | ||
| /// `_main` is usually as the deepest depth. | ||
| depth: usize, | ||
| name: String, | ||
| file_and_line: String, | ||
| } | ||
|
|
||
| /// Capture a callstack, skipping the frames that are not interesting. | ||
| /// | ||
| /// In particular: slips everything before `egui::Context::run`, | ||
| /// and skipping all frames in the `egui::` namespace. | ||
| pub fn capture() -> String { | ||
| let mut frames = vec![]; | ||
| let mut depth = 0; | ||
|
|
||
| backtrace::trace(|frame| { | ||
| // Resolve this instruction pointer to a symbol name | ||
| backtrace::resolve_frame(frame, |symbol| { | ||
| let mut file_and_line = symbol.filename().map(shorten_source_file_path); | ||
|
|
||
| if let Some(file_and_line) = &mut file_and_line { | ||
| if let Some(line_nr) = symbol.lineno() { | ||
| file_and_line.push_str(&format!(":{line_nr}")); | ||
| } | ||
| } | ||
| let file_and_line = file_and_line.unwrap_or_default(); | ||
|
|
||
| let name = symbol | ||
| .name() | ||
| .map(|name| name.to_string()) | ||
| .unwrap_or_default(); | ||
|
|
||
| frames.push(Frame { | ||
| depth, | ||
| name, | ||
| file_and_line, | ||
| }); | ||
| }); | ||
|
|
||
| depth += 1; // note: we can resolve multiple symbols on the same frame. | ||
|
|
||
| true // keep going to the next frame | ||
| }); | ||
|
|
||
| if frames.is_empty() { | ||
| return Default::default(); | ||
| } | ||
|
|
||
| // Inclusive: | ||
| let mut min_depth = 0; | ||
| let mut max_depth = frames.len() - 1; | ||
|
|
||
| for frame in &frames { | ||
| if frame.name.starts_with("egui::callstack::capture") { | ||
| min_depth = frame.depth + 1; | ||
| } | ||
| if frame.name.starts_with("egui::context::Context::run") { | ||
| max_depth = frame.depth; | ||
| } | ||
| } | ||
|
|
||
| // Remove frames that are uninteresting: | ||
| frames.retain(|frame| { | ||
| // Keep some special frames to give the user a sense of chronology: | ||
| if frame.name == "main" | ||
| || frame.name == "_main" | ||
| || frame.name.starts_with("egui::context::Context::run") | ||
| || frame.name.starts_with("eframe::run_native") | ||
| { | ||
| return true; | ||
| } | ||
|
|
||
| if frame.depth < min_depth || max_depth < frame.depth { | ||
| return false; | ||
| } | ||
|
|
||
| // Remove stuff that isn't user calls: | ||
| let skip_prefixes = [ | ||
| // "backtrace::", // not needed, since we cut at at egui::callstack::capture | ||
| "egui::", | ||
| "<egui::", | ||
| "<F as egui::widgets::Widget>", | ||
| "egui_plot::", | ||
| "egui_extras::", | ||
| "core::ptr::drop_in_place<egui::ui::Ui>::", | ||
| "eframe::", | ||
| "core::ops::function::FnOnce::call_once", | ||
| "<alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once", | ||
| ]; | ||
| for prefix in skip_prefixes { | ||
| if frame.name.starts_with(prefix) { | ||
| return false; | ||
| } | ||
| } | ||
| true | ||
| }); | ||
|
|
||
| frames.reverse(); // main on top, i.e. chronological order. Same as Python. | ||
|
|
||
| let mut deepest_depth = 0; | ||
| let mut widest_file_line = 0; | ||
| for frame in &frames { | ||
| deepest_depth = frame.depth.max(deepest_depth); | ||
| widest_file_line = frame.file_and_line.len().max(widest_file_line); | ||
| } | ||
|
|
||
| let widest_depth = deepest_depth.to_string().len(); | ||
|
|
||
| let mut formatted = String::new(); | ||
|
|
||
| if !frames.is_empty() { | ||
| let mut last_depth = frames[0].depth; | ||
|
|
||
| for frame in &frames { | ||
| let Frame { | ||
| depth, | ||
| name, | ||
| file_and_line, | ||
| } = frame; | ||
|
|
||
| if frame.depth + 1 < last_depth || last_depth + 1 < frame.depth { | ||
| // Show that some frames were elided | ||
| formatted.push_str(&format!("{:widest_depth$} …\n", "")); | ||
| } | ||
|
|
||
| formatted.push_str(&format!( | ||
| "{depth:widest_depth$}: {file_and_line:widest_file_line$} {name}\n" | ||
| )); | ||
|
|
||
| last_depth = frame.depth; | ||
| } | ||
| } | ||
|
|
||
| formatted | ||
| } | ||
|
|
||
| /// Shorten a path to a Rust source file from a callstack. | ||
| /// | ||
| /// Example input: | ||
| /// * `/Users/emilk/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.24.1/src/runtime/runtime.rs` | ||
| /// * `crates/rerun/src/main.rs` | ||
| /// * `/rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs` | ||
| fn shorten_source_file_path(path: &std::path::Path) -> String { | ||
| // Look for `src` and strip everything up to it. | ||
|
|
||
| let components: Vec<_> = path.iter().map(|path| path.to_string_lossy()).collect(); | ||
|
|
||
| let mut src_idx = None; | ||
| for (i, c) in components.iter().enumerate() { | ||
| if c == "src" { | ||
| src_idx = Some(i); | ||
| } | ||
| } | ||
|
|
||
| // Look for the last `src`: | ||
| if let Some(src_idx) = src_idx { | ||
| // Before `src` comes the name of the crate - let's include that: | ||
| let first_index = src_idx.saturating_sub(1); | ||
|
|
||
| let mut output = components[first_index].to_string(); | ||
| for component in &components[first_index + 1..] { | ||
| output.push('/'); | ||
| output.push_str(component); | ||
| } | ||
| output | ||
| } else { | ||
| // No `src` directory found - weird! | ||
| path.display().to_string() | ||
| } | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_shorten_path() { | ||
| for (before, after) in [ | ||
| ("/Users/emilk/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.24.1/src/runtime/runtime.rs", "tokio-1.24.1/src/runtime/runtime.rs"), | ||
| ("crates/rerun/src/main.rs", "rerun/src/main.rs"), | ||
| ("/rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs", "core/src/ops/function.rs"), | ||
| ("/weird/path/file.rs", "/weird/path/file.rs"), | ||
| ] | ||
| { | ||
| use std::str::FromStr as _; | ||
| let before = std::path::PathBuf::from_str(before).unwrap(); | ||
| assert_eq!(shorten_source_file_path(&before), after); | ||
| } | ||
| } |
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