Braulio Valdivielso Martínez 1794ad51bd
Sanitize arguments to external commands a bit better (#4157)
* fix #4140

We are passing commands into a shell underneath but we were not
escaping arguments correctly. This new version of the code also takes
into consideration the ";" and "&" characters, which have special
meaning in shells.

We would probably benefit from a more robust way to join arguments to
shell programs. Python's stdlib has shlex.join, and perhaps we can
take that implementation as a reference.

* clean up escaping of posix shell args

I believe the right place to do escaping of arguments was in the
spawn_sh_command function. Note that this change prevents things like:

^echo "$(ls)"

from executing the ls command. Instead, this will just print

$(ls)

The regex has been taken from the python stdlib implementation of shlex.quote

* fix non-literal parameters and single quotes

* address clippy's comments

* fixup! address clippy's comments

* test that subshell commands are sanitized properly
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Nushell core libraries and plugins

These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

Foundational libraries are split into two kinds of crates:

  • Core crates - those crates that work together to build the Nushell language engine
  • Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.

Plugins are likewise also split into two types:

  • Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
  • Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.