ur0 / lolcat

lolcat, now with fearless concurrency.

Lolcat

The good ol' lolcat, now with fearless concurrency.

Run lolcat on everything you like and you'll never have to wonder about the dullness of your life. See? It's that simple.

Installation

Rustacean? Just run cargo install lolcat.

License

Seriously? It's the MIT license.

lolcat's Issues

Can this be published on Homebrew?

I use lolcat almost every day. Until I found this repository, I used the Ruby version by installing it through gem install lolcat. This has always been a hassle because of local Ruby versions.

I'm glad I found the Rust equivalent of lolcat. I'm curious if this could get published on Homebrew so I can install brew install rust-lolcat or something similar? I don't mind updating this repository with docs and managing the formula updates. But I didn't want to do anything without checking in first. Thanks!

snap package for lolcat

I wrote an article about lolcats and how to create snap packages for them,
https://blog.simos.info/how-to-make-a-snap-package-for-lolcat-with-snapcraft-on-ubuntu/
I included this version of lolcat as well!

Add option to not change foreground color when --bg is active

Currently, the foreground color is changed when --bg is active. On short text, this causes the text color to sometimes abruptly change halfway, and I wish to be able to turn this off.

rainbow effect gone

I upgraded from commit 31 to commit 54, and the rainbow effect is gone in the new version.
Now every line starts with the same color, whereas previously it shifted the starting color a bit, making the output much more vibrant.
commit 31:

commit 54:

If the last argument is a file, open and cat it?

Not sure how much complexity this adds...

panicks when streaming ascii star wars

{ sleep 1 ; echo starwars ; sleep 99999 ;} | nc -c telehack.com 23 | RUST_BACKTRACE=full lolcat

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Kind(InvalidData)', /Users/michael1/.cargo/registry/src/index.crates.io-6f17d22bba15001f/lolcat-1.5.0/src/main.rs:24:60
stack backtrace:
   0:        0x109decd73 - std::backtrace_rs::backtrace::libunwind::trace::h211824fb0870b7d7
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:        0x109decd73 - std::backtrace_rs::backtrace::trace_unsynchronized::h0e69993850353c73
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:        0x109decd73 - std::sys_common::backtrace::_print_fmt::hee91bd3b61c5fec7
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:65:5
   3:        0x109decd73 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9b8c7d4986eea143
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:44:22
   4:        0x109e06c3b - core::fmt::rt::Argument::fmt::hea92c31b43c9e564
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/fmt/rt.rs:138:9
   5:        0x109e06c3b - core::fmt::write::h745c6d87d2702197
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/fmt/mod.rs:1094:21
   6:        0x109dea28e - std::io::Write::write_fmt::h9bc75e1a1578f329
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/io/mod.rs:1714:15
   7:        0x109decb6a - std::sys_common::backtrace::_print::h98bb00e155d79a89
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:47:5
   8:        0x109decb6a - std::sys_common::backtrace::print::hb5816525719dec2d
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:34:9
   9:        0x109dedf35 - std::panicking::default_hook::{{closure}}::hfc88b82ae9ab0222
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:269:22
  10:        0x109dedcdf - std::panicking::default_hook::h2cb72824a505d11d
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:288:9
  11:        0x109dee490 - std::panicking::rust_panic_with_hook::hc7199b95a24a631d
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:705:13
  12:        0x109dee3b3 - std::panicking::begin_panic_handler::{{closure}}::h29c0dd87214757f4
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:597:13
  13:        0x109ded179 - std::sys_common::backtrace::__rust_end_short_backtrace::hd299ff4177db45a7
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/sys_common/backtrace.rs:151:18
  14:        0x109dee0ed - rust_begin_unwind
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:593:5
  15:        0x109e10433 - core::panicking::panic_fmt::h8b25e6b7bc9d8aa4
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/panicking.rs:67:14
  16:        0x109e107e5 - core::result::unwrap_failed::h3575be054108b8be
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/result.rs:1651:5
  17:        0x109d75082 - lolcat::cat::print_chars_lol::h020bb8e4a14de7a5
  18:        0x109d776be - lolcat::main::hb84b2e210e3827df
  19:        0x109d7b7c6 - std::sys_common::backtrace::__rust_begin_short_backtrace::h89b72f6f6c527f26
  20:        0x109d7b7dc - std::rt::lang_start::{{closure}}::h44df6f286e049f18
  21:        0x109de677a - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h136184a71f015bca
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/core/src/ops/function.rs:284:13
  22:        0x109de677a - std::panicking::try::do_call::h2e2637ab353d5609
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:500:40
  23:        0x109de677a - std::panicking::try::hab157366490bbca8
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:464:19
  24:        0x109de677a - std::panic::catch_unwind::h65a1f3af6151de00
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panic.rs:142:14
  25:        0x109de677a - std::rt::lang_start_internal::{{closure}}::h34628e201aebaa71
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/rt.rs:148:48
  26:        0x109de677a - std::panicking::try::do_call::hb94abc6ad51b64cb
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:500:40
  27:        0x109de677a - std::panicking::try::h8e012c727c1c58c7
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panicking.rs:464:19
  28:        0x109de677a - std::panic::catch_unwind::h4d612bb9078ec854
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/panic.rs:142:14
  29:        0x109de677a - std::rt::lang_start_internal::h4f6dde0e5153fc54
                               at /rustc/d5c2e9c342b358556da91d61ed4133f6f50fc0c3/library/std/src/rt.rs:148:20
  30:        0x109d787dc - _main
  31:     0x7ff803800310 - <unknown>

When printing a line that is longer than the length of the terminal, try to detect that and

From clolcat:

// if a single line is too fat it might break down to multiple visual lines,
	// but the color will be as if it was a single visual line. So we get the
	// width of the terminal and every time it is reached we act as if a \n
	// appeared

Seems like a good feature. I will try to implement after exams.

lolcat shouldn't change your bg color

Currently lolcat changes your terminal background color to black. The original lolcat doesn't do this.

Black portion is your version of lolcat, bottom half is with original authors, in ruby.

So much for blazingly fast

So I was quite pleased with myself that this implementation is much faster than other rust lolcats. But

hyperfine 'lolcat words' '/tmp/lolcrab/target/release/lolcrab words' /tmp/clolcat/clolcat\ words
Benchmark 1: lolcat words
  Time (mean ± σ):     110.0 ms ±  14.8 ms    [User: 89.9 ms, System: 18.7 ms]
  Range (min … max):    87.6 ms … 135.3 ms    23 runs
 
Benchmark 2: /tmp/lolcrab/target/release/lolcrab words
  Time (mean ± σ):     294.6 ms ±  12.0 ms    [User: 258.1 ms, System: 35.5 ms]
  Range (min … max):   280.0 ms … 310.7 ms    10 runs
 
Benchmark 3: /tmp/clolcat/clolcat words
  Time (mean ± σ):       1.1 ms ±   0.4 ms    [User: 0.4 ms, System: 0.9 ms]
  Range (min … max):     0.0 ms …   3.1 ms    1748 runs
 
Summary
  '/tmp/clolcat/clolcat words' ran
  103.45 ± 43.90 times faster than 'lolcat words'
  277.00 ± 112.04 times faster than '/tmp/lolcrab/target/release/lolcrab words'

That's not good. We can probably do a lot better. clolcat does not handle any escape sequences and so there are reasons to prefer going slower. But they're probably doing something quite clever which, especially when printing files and not stdin, I want to look into.

Update crate for lolcat

How do we do that? @ur0

Currently, it installs a previous version if I run cargo install lolcat. I assumed it tracked this repository directly, but I guess not.

lolcat --help should display its help as a rainbow, if supported

:D

inconsistent coloring

ruby lolcat makes a nice rainbow of the entire buffer, instead of breaking line by line:

ruby

rust

When printing a line that is longer than the length of the terminal, try to detect that and

From clolcat:

// if a single line is too fat it might break down to multiple visual lines,
	// but the color will be as if it was a single visual line. So we get the
	// width of the terminal and every time it is reached we act as if a \n
	// appeared

Seems like a good feature. I will try to implement after exams.

lolcat doesn't work on my Ubuntu 21.x

Confirmed it works on ubuntu 20.x but the colors don't work properly for any lolcat distribution on 21.x. Have tried with many different lolcat versions. Text is gray and occasionally displays a character with a colored background or blinking

`sl | lolcat` renders incorrectly

This recording probably sums it up best.