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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| use std::{ | ||
| fs::File, | ||
| io::{self, BufRead}, | ||
| path::Path, | ||
| }; | ||
|
|
||
| use crate::{Backtrace, Frame, FrameFilter, PanicInfo, SourceInfo}; | ||
|
|
||
| const GREEN: anstyle::Style = | ||
| anstyle::Style::new().fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Green))); | ||
| const CYAN: anstyle::Style = | ||
| anstyle::Style::new().fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Cyan))); | ||
| const RED: anstyle::Style = | ||
| anstyle::Style::new().fg_color(Some(anstyle::Color::Ansi(anstyle::AnsiColor::Red))); | ||
| const BOLD: anstyle::Style = anstyle::Style::new().bold(); | ||
| const RESET: anstyle::Reset = anstyle::Reset; | ||
|
|
||
| impl Backtrace { | ||
| pub fn render(&self, filter: &mut impl FrameFilter) -> io::Result<()> { | ||
| if self.frames.is_empty() { | ||
| return Ok(()); | ||
| } | ||
| let framnow = self.compute_frameno_width(); | ||
| let linenow = self.compute_lineno_width(); | ||
| let width = self.compute_width(framnow); | ||
| anstream::eprintln!("\n{:━^width$}", " BACKTRACE "); | ||
|
|
||
| let mut hidden = 0; | ||
| for frame in self.frames.iter().rev() { | ||
| if filter.should_hide(frame) { | ||
| hidden += 1; | ||
| } else { | ||
| print_hidden_frames_message(hidden, width)?; | ||
| frame.render(framnow, linenow)?; | ||
| hidden = 0; | ||
| } | ||
| } | ||
| print_hidden_frames_message(hidden, width)?; | ||
|
|
||
| if let Some(panic_info) = &self.panic_info { | ||
| panic_info.render()?; | ||
| } | ||
|
|
||
| eprintln!(); | ||
| Ok(()) | ||
| } | ||
|
|
||
| fn compute_lineno_width(&self) -> usize { | ||
| // This is assuming we have 2 more lines in the file, if we don't, in the worst case we will | ||
| // print an unnecesary extra space for each line number. | ||
| self.frames | ||
| .iter() | ||
| .flat_map(|f| &f.source_info) | ||
| .map(|source_info| source_info.lineno + 3) | ||
| .max() | ||
| .unwrap_or(1) | ||
| .ilog10() as usize | ||
| } | ||
|
|
||
| fn compute_frameno_width(&self) -> usize { | ||
| self.frames.len().ilog10() as usize + 1 | ||
| } | ||
|
|
||
| fn compute_width(&self, frameno_width: usize) -> usize { | ||
| let term_size = termion::terminal_size().unwrap_or((80, 0)).0 as usize; | ||
| self.frames | ||
| .iter() | ||
| .map(|f| f.width(frameno_width)) | ||
| .max() | ||
| .unwrap_or(80) | ||
| .min(term_size) | ||
| } | ||
| } | ||
|
|
||
| impl Frame { | ||
| fn render(&self, framenow: usize, linenow: usize) -> io::Result<()> { | ||
| anstream::eprintln!( | ||
| "{:>framenow$}: {GREEN}{}{RESET}", | ||
| self.frameno, | ||
| self.function | ||
| ); | ||
|
|
||
| if let Some(source_info) = &self.source_info { | ||
| let padding = Padding(framenow); | ||
| anstream::eprintln!("{padding} at {source_info}"); | ||
| source_info.render_code(padding, linenow)?; | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| fn width(&self, frameno_width: usize) -> usize { | ||
| usize::max( | ||
| frameno_width + 2 + self.function.len(), | ||
| self.source_info | ||
| .as_ref() | ||
| .map(|s| s.width(frameno_width)) | ||
| .unwrap_or(0), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| fn print_hidden_frames_message(hidden: u32, width: usize) -> io::Result<()> { | ||
| let msg = match hidden { | ||
| 0 => return Ok(()), | ||
| 1 => format!(" ({hidden} frame hidden) "), | ||
| _ => format!(" ({hidden} frames hidden) "), | ||
| }; | ||
| anstream::eprintln!("{CYAN}{msg:┄^width$}{RESET}"); | ||
| Ok(()) | ||
| } | ||
|
|
||
| impl SourceInfo { | ||
| fn render_code(&self, padding: Padding, linenow: usize) -> io::Result<()> { | ||
| let path = Path::new(&self.file); | ||
| if path.exists() { | ||
| let lineno = self.lineno - 1; | ||
| let file = File::open(path)?; | ||
| let reader = io::BufReader::new(file); | ||
| let viewport: Vec<_> = reader | ||
| .lines() | ||
| .enumerate() | ||
| .skip(lineno.saturating_sub(2)) | ||
| .take(5) | ||
| .collect(); | ||
| for (i, line) in viewport { | ||
| if i == lineno { | ||
| anstream::eprint!("{BOLD}"); | ||
| } | ||
| anstream::eprintln!("{padding} {:>linenow$} | {}", i + 1, line?); | ||
| if i == lineno { | ||
| anstream::eprint!("{RESET}"); | ||
| } | ||
| } | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| /// Width without considering the source code snippet | ||
| fn width(&self, framenow: usize) -> usize { | ||
| framenow + self.file.len() + (self.lineno.ilog10() + self.colno.ilog10()) as usize + 9 | ||
| } | ||
| } | ||
|
|
||
| impl PanicInfo { | ||
| fn render(&self) -> io::Result<()> { | ||
| anstream::eprint!("{RED}"); | ||
| anstream::eprintln!("thread '{}' panickd at {}", self.thread, self.at); | ||
| for line in &self.message { | ||
| anstream::eprintln!("{line}"); | ||
| } | ||
| anstream::eprint!("{RESET}"); | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| impl std::fmt::Display for SourceInfo { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| write!(f, "{}:{}:{}", self.file, self.lineno, self.colno) | ||
| } | ||
| } | ||
|
|
||
| struct Padding(usize); | ||
|
|
||
| impl std::fmt::Display for Padding { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| for _ in 0..self.0 { | ||
| write!(f, " ")?; | ||
| } | ||
| Ok(()) | ||
| } | ||
| } |