willbe 0.34.0

Utility to publish multi-crate and multi-workspace environments and maintain their consistency.
Documentation 
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#[ allow( clippy ::std_instead_of_alloc, clippy ::std_instead_of_core ) ]
mod private
{

  use crate :: *;
  use std ::
  {
  fmt ::Formatter,
  ffi ::OsString,
 };
  use std ::path ::Path;
  use collection_tools ::collection ::HashSet;
  use error ::untyped :: { Error };

  use process_tools ::process :: *;

  /// The `Channel` enum represents different release channels for rust.
  #[ derive( Debug, Default, Copy, Clone, Hash, Eq, PartialEq, Ord, PartialOrd ) ]
  pub enum Channel
  {
  /// Represents the stable release channel.
  #[ default ]
  Stable,
  /// Represents the nightly release channel.
  Nightly,
 }

  impl std ::fmt ::Display for Channel
  {
  fn fmt( &self, f: &mut Formatter< '_ > ) -> std ::fmt ::Result
  {
   match self
   {
  Self ::Stable => write!( f, "stable" ),
  Self ::Nightly => write!( f, "nightly" ),
 }
 }
 }

  impl TryFrom< String > for Channel
  {
  type Error = error ::untyped ::Error;
  fn try_from( value: String ) -> Result< Self, Self ::Error >
  {
   Ok( match value.as_ref()
   {
  "stable" => Self ::Stable,
  "nightly" => Self ::Nightly,
  other => error ::untyped ::bail!( "Unexpected channel value. Expected [stable, channel]. Got: `{other}`" ),
 })
 }
 }

  /// Retrieves a list of available channels.
  ///
  /// This function takes a path and returns a `Result` with a vector of strings representing the available channels.
  ///
  /// # Errors
  /// qqq: doc
  // qqq: typed error
  pub fn available_channels< P >( path: P ) -> error ::untyped ::Result< HashSet< Channel > >
  where
  P: AsRef< Path >,
  {
  let ( program, options ) = ( "rustup", [ "toolchain", "list" ] );
  let report = Run ::former()
  .bin_path( program )
  .args( options.into_iter().map( OsString ::from ).collect :: < Vec< _ > >() )
  .current_path( path.as_ref().to_path_buf() )
  .run().map_err :: < Error, _ >( | report | error ::untyped ::format_err!( report.to_string() ) )?;

  let list = report
  .out
  .lines()
  // toolchain with a name without `-` may exist, but we are looking at specific ones
  .filter_map( | l | l.split_once( '-' ) )
  .filter_map( |( c, _ ) | match c
  {
   "stable" => Some( Channel ::Stable ),
   "nightly" => Some( Channel ::Nightly ),
   _ => None
 })
  .collect();

  Ok( list )
 }
}

//

crate ::mod_interface!
{
  own use Channel;
  own use available_channels;
}