deno upgrade

[ry]

This is a new subcommand (which should be written entirely in Rust) that can download the newest deno executable.

Something like this:

1. Check github for latest version
2. Compare against current version
3. If newer version exists, download newest into temp dir
4. replace std::env::current_exe() with new.

Should not use github API. Use https://github.com/denoland/deno_install/blob/master/install.sh for guidance.

[axetroy]

Talk about the problems encountered before

In Windows, after downloading a new Deno executable, the file cannot be replaced directly because the file is using by process

Solution:

rename executable to another name executable_old
and move executable_new to executable

There are already some Deno version management tools
https://github.com/axetroy/dvm
https://github.com/justjavac/dvm
https://github.com/imbsky/dvm

[bartOssh]

Is it possible that I can work on it ?

[ry]

@bartOssh go for it

[bartlomieju]

Done in #4328