fn run_file<O: Write, P: AsRef<Path>, B: AsMut<Vec<u8>>>(
  out: &mut O,
  options: &args::Options,
  pattern: &Regex,
  path: P,
  buffer: &mut B
) -> io::Result<bool> {
  let buffer = buffer.as_mut();
  let path = path.as_ref();

  buffer.clear();

  let (read_result, path) =
    if path == Path::new(args::STDIN) { // Path::new is cost-free.
      (io::stdin().lock().read_to_end(buffer), Path::new("<stdin>").display())
    }
    else {
      let mut file = File::open(path)
                          .map_err(|e| {
                            eprintln!("Error: failed to open file '{}'", path.display());
                            e
                          })?;

      // Resize buffer to the file size if it exceeds the current size.
      // Currently, the strategy is to grow if needed, and otherwise do nothing.
      // Considering we never shrink the buffer, this can be bad if the first file
      // is huge and the others are small.
      let file_size = file.metadata()
                          .map(|m| m.len())
                          .unwrap_or(0) as usize;
      buffer.reserve(
        file_size.saturating_sub(buffer.len())
      );

      (file.read_to_end(buffer), path.display())
    };

  if let Err(e) = read_result {
    eprintln!("Error: failed to read file '{}'", path);
    return Err(e);
  }


  // Trim the ending newline if requested and present:
  if options.trim_ending_newline && buffer.last() == Some(&b'\n') {
    buffer.pop();
  };


  let matched = match options.output {
    args::Output::FileName => grep_filename (out, options, pattern, path, buffer),
    args::Output::Bytes    => grep_bytes    (out, options, pattern, path, buffer),
    args::Output::Offset   => grep_offset   (out, options, pattern, path, buffer)
  }?;

  Ok(matched)
}
/// Run bgrep with the given options, outputting to the given `out`.
/// Error detail may be outputted to stderr.
/// Returns whether there was a match.
Run bgrep with the given options, outputting to the given `out`.
Error detail may be outputted to stderr.
Returns whether there was a match.
Run bgrep with the given options outputting to the given ` out ` . Error detail may be outputted to stderr . Returns whether there was a match .
fn run_file<O: Write, P: AsRef<Path>, B: AsMut<Vec<u8>>>(
  out: &mut O,
  options: &args::Options,
  pattern: &Regex,
  path: P,
  buffer: &mut B
) -> io::Result<bool> {
  let buffer = buffer.as_mut();
  let path = path.as_ref();
  buffer.clear();
  let (read_result, path) =
    if path == Path::new(args::STDIN) { // Path::new is cost-free.
      (io::stdin().lock().read_to_end(buffer), Path::new("<stdin>").display())
    }
    else {
      let mut file = File::open(path)
                          .map_err(|e| {
                            eprintln!("Error: failed to open file '{}'", path.display());
                            e
                          })?;
      // Resize buffer to the file size if it exceeds the current size.
      // Currently, the strategy is to grow if needed, and otherwise do nothing.
      // Considering we never shrink the buffer, this can be bad if the first file
      // is huge and the others are small.
      let file_size = file.metadata()
                          .map(|m| m.len())
                          .unwrap_or(0) as usize;
      buffer.reserve(
        file_size.saturating_sub(buffer.len())
      );
      (file.read_to_end(buffer), path.display())
    };
  if let Err(e) = read_result {
    eprintln!("Error: failed to read file '{}'", path);
    return Err(e);
  }
  // Trim the ending newline if requested and present:
  if options.trim_ending_newline && buffer.last() == Some(&b'\n') {
    buffer.pop();
  };
  let matched = match options.output {
    args::Output::FileName => grep_filename (out, options, pattern, path, buffer),
    args::Output::Bytes    => grep_bytes    (out, options, pattern, path, buffer),
    args::Output::Offset   => grep_offset   (out, options, pattern, path, buffer)
  }?;
  Ok(matched)
}
fn run_file < O : Write , P : AsRef < Path > , B : AsMut < Vec < u8 > > > ( out : & mut O , options : & args :: Options , pattern : & Regex , path : P , buffer : & mut B ) -> io :: Result < bool > { let buffer = buffer . as_mut ( ) ; let path = path . as_ref ( ) ; buffer . clear ( ) ; let ( read_result , path ) = if path == Path :: new ( args :: STDIN ) { // Path::new is cost-free. ( io :: stdin ( ) . lock ( ) . read_to_end ( buffer ) , Path :: new ( " " ) . display ( ) ) } else { let mut file = File :: open ( path ) . map_err ( | e | { eprintln ! ( " " path display ( ) ) ; e } ) ? ; // Resize buffer to the file size if it exceeds the current size. // Currently, the strategy is to grow if needed, and otherwise do nothing. // Considering we never shrink the buffer, this can be bad if the first file // is huge and the others are small. let file_size = file . metadata ( ) . map ( | m | m . len ( ) ) . unwrap_or ( 0 ) as usize ; buffer . reserve ( file_size . saturating_sub ( buffer . len ( ) ) ) ; ( file . read_to_end ( buffer ) , path . display ( ) ) } ; if let Err ( e ) = read_result { eprintln ! ( " " path ) ; return Err ( e ) ; } // Trim the ending newline if requested and present: if options . trim_ending_newline && buffer . last ( ) == Some ( & b'\n' ) { buffer . pop ( ) ; } ; let matched = match options . output { args :: Output :: FileName => grep_filename ( out , options , pattern , path , buffer ) , args :: Output :: Bytes => grep_bytes ( out , options , pattern , path , buffer ) , args :: Output :: Offset => grep_offset ( out , options , pattern , path , buffer ) } ? ; Ok ( matched ) }
Run bgrep with the given options, outputting to the given `out`.
Run bgrep with the given options outputting to the given ` out ` .
out
&mut O
options
&args::Options
pattern
&Regex
path
P
buffer
&mut B
out
&mut O
options
&args::Options
pattern
&Regex
path
P
buffer
&mut B