pls is slow!

[ix]

NOTE: All benchmarks here are performed with perf with -r100, printing /dev

The majority of pls' execution time (and responsible for the majority of its instructions, 11 million of the total 15 million), is spent adjusting color and resetting it with the term crate. We should fix this by implementing our own means of colorization, even if it's not portable.

I also believe print! and println! to be slower than writing directly to stdout, though this needs further testing.

[ix]

I tried increasing the speed of output using both Stdout::write directly and then BufWriter<Stdout>, however the former is roughly the same speed as using print! and println! and the latter is actually slower.

I think the only other thing I can try to increase the speed of output is using the libc functions.

[ix]

Note that, on my machine, pls is now as fast, if not faster, than GNU's ls (except for when sorting is enabled, which makes it a little slower).

[ix]

Tested on another machine and it's usually as fast or faster than GNU ls.

[ix]

We may be reaching a point where little else can be done to optimize the program.