Created
November 13, 2013 23:16
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Rustic Cat
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| /* | |
| * Rustic cat. If any command-line arguments are supplied, this | |
| * program will print out the contents of each of those files. | |
| * Otherwise, it prints out whatever is read from stdin. | |
| * | |
| * As of Rust 0.8, this failed to compile with this error: | |
| * | |
| * error: internal compiler error: unexpected failure | |
| * note: the compiler hit an unexpected failure path. this is a bug | |
| * note: try running with RUST_LOG=rustc=1 to get further details and report the results to github.com/mozilla/rust/issues | |
| * | |
| * And with RUST_LOG=rustc=1: | |
| * | |
| * task <unnamed> failed at 'assertion failed: rp.is_none()', /opt/rust/0.8/src/librustc/middle/typeck/collect.rs:1108 | |
| * error: internal compiler error: unexpected failure | |
| * note: the compiler hit an unexpected failure path. this is a bug | |
| * note: try running with RUST_LOG=rustc=1 to get further details and report the results to github.com/mozilla/rust/issues | |
| * task <unnamed> failed at 'explicit failure', /opt/rust/0.8/src/librustc/rustc.rs:391 | |
| */ | |
| use std::io; | |
| use std::iter; | |
| use std::os; | |
| condition! { | |
| pub file_not_found : ~str -> ~str; | |
| } | |
| fn cat<T: io::Reader>(reader: &T) { | |
| loop { | |
| let line = reader.read_line(); | |
| if reader.eof() { | |
| break; | |
| } | |
| io::println(line); | |
| } | |
| } | |
| fn cat_files<T: Iterator<&'self ~str>>(files: &T) { | |
| let stderr = io::stderr(); | |
| do file_not_found::cond.trap(|filename| "cat: " + filename + ": No such file or directory").inside { | |
| for file in files { | |
| let filename = file.to_str(); | |
| let p = &Path(filename); | |
| if !p.exists() { | |
| stderr.write_str(file_not_found::cond.raise(filename) + "\n"); | |
| } else { | |
| let r = io::file_reader(p); | |
| if r.is_ok() { | |
| cat(&r.unwrap()); | |
| } else { | |
| fail!(r.unwrap_err()); | |
| } | |
| } | |
| } | |
| } | |
| } | |
| fn main() { | |
| let args: ~[~str] = os::args(); | |
| if args.len() > 1 { | |
| cat_files(&args.iter().skip(1)); | |
| } else { | |
| cat(&io::stdin()); | |
| } | |
| } |
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