Improve performance and add profiling tooling

Add tags, todo, *.bench, *.svg and bench_output to .gitignore

Add test/bench.sh script. bench.sh runs the `bench` command on each
test/long*txt file with range 3:5 and saves the output to a file for
comparing performance across file sizes.

Inline printing in get_choice_slice

Change BufWriter<..stdout..> to BufWriter<T>

Add MockStdout for testing printing

Add more reverse range tests

Simplify word finding with a more uniform bounds check.

Add Makefile for generating flamegraphs

Redefine Choice struct as a start and end integer

Improve algorithm for finding words to print

Settle exclusivity at Config construction time

Add tests for nonexistant field_seps

Add regression test for preceding separator

Use handle.write instead of write! macro for tremendous speed up

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 1050950..51f1b1f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -28,7 +28,7 @@ fn main() {
                 for choice in &config.opt.choice {
                     choice.print_choice(&l, &config, &mut handle);
                 }
-                writeln!(handle, "");
+                handle.write(b"\n").unwrap();
             }
             Err(e) => println!("ERROR: {}", e),
         }