Rewrite "tools/" scripts in Deno

[bartlomieju]

Various utility scripts in deno repository, that are used during development and CI, are written in Python. Those are scripts in tools/ directory. They are used for formatting, linting, parsing benchmarks output, etc.

I think it would be beneficial to rewrite them to use Deno instead of Python. Doing so would completely remove dependency on Python (unsure about that, rusty_v8 probably still needs it?) and close #5114 and #2893.

Changes needed to resolve this issue:

• install deno in CI script (.github/workflows/ci.yml)
• for each script in tools/:
  • rewrite the script in deno
  • replace invocation of the script to call deno

The easiest to rewrite would be tools/format.py and tools/lint.py. Here are respective example scripts from deno_lint repository which can be used as a basis for this refactor:

• https://github.com/denoland/deno_lint/blob/master/tools/format.ts
• https://github.com/denoland/deno_lint/blob/master/tools/lint.ts

[crowlKats]

for installing deno in CI script, would be using https://github.com/denolib/setup-deno alright, or rather do it manually?

[bartlomieju]

@crowlKats I think we should use deno_install script

[MarkTiedemann]

If you just want to determine the latest Deno executable, download and unzip it, you can do that in a shell or cmd one-liner (or 3-liner, nicely formatted).

v=$(curl -sSf https://github.com/denoland/deno/releases | grep -o \/denoland/deno/releases/download/.*/deno-x86_64-unknown-linux-gnu.zip | head -1 | cut -d/ -f6)
curl -Lo deno.zip https://github.com/denoland/deno/releases/download/$v/deno-x86_64-unknown-linux-gnu.zip
unzip deno.zip

for /f "delims=/ tokens=6" %%v in ('"curl -sSf https://github.com/denoland/deno/releases | findstr \/denoland/deno/releases/download/.*/deno-x86_64-pc-windows-msvc.zip | findstr /n . | findstr ^1:"') do (
    curl -Lo deno.zip https://github.com/denoland/deno/releases/download/%%v/deno-x86_64-pc-windows-msvc.zip
    tar xf deno.zip
)

Both setup-deno and deno_install deal with edge cases, different arguments, versions, putting Deno in the PATH, etc. If the requirements are simpler than that, you could get away with simpler scripts...

// Note that curl and tar are installed by default on recent Windows. unzip is not available by default on all *nixes.