Author of ripgrep here.

Very cool! It looks like Rak has a lot of nice features.

I will say that getting this thing built took some digging. Could you please add install/build instructions to the README? As it is, I had to go sleuthing through your CI setup to figure it out. On Archlinux, here's what I did:

    $ yay -S rakudo-bin
    $ export PATH="/usr/share/perl6/site/bin:$PATH"
    $ git clone https://github.com/lizmat/App-Rak
    $ cd App-Rak
    $ zef install .
    $ export PATH="$HOME/.raku/bin:$PATH"

I realize features and an expressive language is your main goal, but I wanted to see what it looked like from a perf perspective:

    $ git remote -v
    origin  git@github.com:rust-lang/rust (fetch)
    origin  git@github.com:rust-lang/rust (push)

    $ git rev-parse HEAD
    699f4a637ef382ea0716c72f60d0c1c4cd79df41

    $ time rg accelerated --files-with-matches
    compiler/rustc_target/src/spec/thumbv7em_none_eabi.rs
    src/llvm-project/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
    src/llvm-project/llvm/docs/PDB/HashTable.rst

    real    0.126
    user    0.544
    sys     0.850
    maxmem  22 MB
    faults  0

    $ time rak accelerated --files-with-matches
    compiler/rustc_target/src/spec/thumbv7em_none_eabi.rs
    src/llvm-project/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
    src/llvm-project/llvm/docs/PDB/HashTable.rst

    real    17.005
    user    2:07.88
    sys     8.866
    maxmem  1565 MB
    faults  0

I'm not totally clear on what kind of filtering `rak` does by default, so I also ran a search on a single plain text file:

    $ cd /dev/shm
    $ curl -LO https://burntsushi.net/stuff/opensubtitles/2018/en/sixteenth.txt.gz
    $ gunzip sixteenth.txt.gz
    $ time rg 'Sherlock Holmes' sixteenth.txt -c
    426

    real    0.068
    user    0.047
    sys     0.020
    maxmem  778 MB
    faults  0

    $ time rg 'Sherlock Holmes' sixteenth.txt -c --no-mmap
    426

    real    0.089
    user    0.026
    sys     0.063
    maxmem  14 MB
    faults  0

    $ time rak 'Sherlock Holmes' sixteenth.txt --count-only
    426 matches in 1 file

    real    48.236
    user    48.010
    sys     0.334
    maxmem  215 MB
    faults  0

    $ time grep 'Sherlock Holmes' sixteenth.txt -c
    426

    real    0.297
    user    0.233
    sys     0.063
    maxmem  14 MB
    faults  0