Add option to hide frames via regexes

Cargo.toml

@@ -8,5 +8,7 @@ version = "0.1.0"
 [dependencies]
 clap = { version = "4.5.8", features = ["derive", "wrap_help"] }
 regex = "1.10.5"
+serde = { version = "1.0.203", features = ["derive"] }
 termcolor = "1.4.1"
 termion = "4.0.2"
+toml = "0.8.14"

README.md

@@ -14,7 +14,7 @@ cargo install --git https://github.com/nilehmann/backtracetk
 
 ## Screenshot
 
-![Screenshot](./screenshot.png)
+![Screenshot](./screenshot1.png)
 
 ## Usage
 
@@ -28,11 +28,20 @@ Arguments:
   [CMD]...
 
 Options:
-      --style <STYLE>     Set the backtrace style to short (RUST_BACKTRACE=1) or full (RUST_BACKTRACE=full)
-                          [default: short] [possible values: short, full]
-      --no-lib-backtrace  Set RUST_LIB_BACKTRACE=0
-      --hide-output       By default, backtracetk prints every captured line as it reads it to get immediate
-                          feedback. If this flag is set, this output is suppressed and nothing will be printed
-                          until the program exits
-  -h, --help              Print help
+      --style <STYLE>         Set the backtrace style to short (RUST_BACKTRACE=1) or full
+                              (RUST_BACKTRACE=full) [default: short] [possible values: short, full]
+      --enable-lib-backtrace  By default, backtracetk sets RUST_LIB_BACKTRACE=0. Set this flag to revert this
+                              behavior
+      --hide-output           By default, backtracetk prints each captured line as it reads it, providing
+                              immediate feedback. If this flag is set, this output is suppressed, and nothing
+                              will be printed until the program exits
+  -h, --help                  Print help
+
 ```
+
+### Configuration
+
+Backtracetk will attempt to locate a configuration file named `backtrack.toml` or `.backtrack.toml` in the parent directories starting from where the command is executed. Currently, the only supported configuration is `hide`, which accepts a list of regex patterns.
+Any frame matching on of these patterns will be hidden from the output. For example:
+
+![Screenshot2](./screenshot2.png)

backtracetk.toml

@@ -0,0 +1 @@
+hide = ["core::panicking", "rust_begin_unwind"] 

src/lib.rs

@@ -12,26 +12,8 @@ pub struct Backtrace {
     panic_info: Option<PanicInfo>,
 }
 
-struct PanicInfo {
-    thread: String,
-    at: String,
-    message: Vec<String>,
-}
-
-pub struct Frame {
-    function: String,
-    frameno: u32,
-    source_info: Option<SourceInfo>,
-}
-
-pub struct SourceInfo {
-    file: String,
-    lineno: usize,
-    colno: usize,
-}
-
 impl Backtrace {
-    pub fn render(&self, out: &mut StandardStream) -> io::Result<()> {
+    pub fn render(&self, out: &mut StandardStream, filter: &mut impl Filter) -> io::Result<()> {
         if self.frames.is_empty() {
             return Ok(());
         }
@@ -40,9 +22,17 @@ impl Backtrace {
         let width = self.compute_width(framnow);
         writeln!(out, "\n{:━^width$}", " BACKTRACE ")?;
 
+        let mut hidden = 0;
         for frame in self.frames.iter().rev() {
-            frame.render(out, framnow, linenow)?;
+            if filter.exclude(frame) {
+                hidden += 1;
+            } else {
+                print_hidden_frames_message(out, hidden)?;
+                frame.render(out, framnow, linenow)?;
+                hidden = 0;
+            }
         }
+        print_hidden_frames_message(out, hidden)?;
 
         if let Some(panic_info) = &self.panic_info {
             panic_info.render(out)?;
@@ -78,6 +68,18 @@ impl Backtrace {
     }
 }
 
+struct PanicInfo {
+    thread: String,
+    at: String,
+    message: Vec<String>,
+}
+
+pub struct Frame {
+    pub function: String,
+    frameno: u32,
+    source_info: Option<SourceInfo>,
+}
+
 impl Frame {
     fn render(&self, out: &mut StandardStream, framenow: usize, linenow: usize) -> io::Result<()> {
         write!(out, "{:>framenow$}: ", self.frameno)?;
@@ -103,6 +105,26 @@ impl Frame {
     }
 }
 
+pub struct SourceInfo {
+    file: String,
+    lineno: usize,
+    colno: usize,
+}
+
+fn print_hidden_frames_message(out: &mut StandardStream, hidden: u32) -> io::Result<()> {
+    out.set_color(ColorSpec::new().set_fg(Some(Color::Cyan)))?;
+    match hidden {
+        0 => {}
+        1 => {
+            writeln!(out, " ({hidden} frame hidden)")?;
+        }
+        _ => {
+            writeln!(out, " ({hidden} frames hidden)")?;
+        }
+    }
+    out.set_color(&ColorSpec::new())
+}
+
 impl SourceInfo {
     fn render(&self, out: &mut StandardStream, framenow: usize, linenow: usize) -> io::Result<()> {
         write!(out, "{:framenow$}  at ", "")?;
@@ -303,3 +325,16 @@ impl Parser {
         backtraces
     }
 }
+
+pub trait Filter {
+    fn exclude(&mut self, frame: &Frame) -> bool;
+}
+
+impl<F> Filter for F
+where
+    F: FnMut(&Frame) -> bool,
+{
+    fn exclude(&mut self, frame: &Frame) -> bool {
+        (self)(frame)
+    }
+}