Module: Thermite::Cargo

Included in:
Tasks
Defined in:
lib/thermite/cargo.rb

Overview

Cargo helpers

Instance Method Summary collapse

Instance Method Details

#cargo ⇒ Object

Path to cargo. Can be overwritten by using the CARGO environment variable.



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# File 'lib/thermite/cargo.rb', line 30

def cargo
  @cargo ||= find_executable(ENV.fetch('CARGO', 'cargo'))
end

#cargo_manifest_path_args ⇒ Object

If the cargo_workspace_member option is set, the --manifest-path argument to cargo.



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# File 'lib/thermite/cargo.rb', line 64

def cargo_manifest_path_args
  return [] unless config.cargo_workspace_member

  manifest = File.join(config.cargo_workspace_member, 'Cargo.toml')
  ['--manifest-path', manifest]
end

#cargo_msg(require_severity) ⇒ Object

Message used when cargo is not found.

require_severity is the verb that indicates how important Rust is to the library.



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# File 'lib/thermite/cargo.rb', line 87

def cargo_msg(require_severity)
  <<MESSAGE
****
Rust's Cargo is #{require_severity} to build this extension. Please install
Rust and put it in the PATH, or set the CARGO environment variable appropriately.
****
MESSAGE
end

#cargo_recommended_msg ⇒ Object

Message used when cargo is recommended but not found.



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# File 'lib/thermite/cargo.rb', line 106

def cargo_recommended_msg
  cargo_msg('recommended (but not required)')
end

#cargo_required_msg ⇒ Object

Message used when cargo is required but not found.



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# File 'lib/thermite/cargo.rb', line 99

def cargo_required_msg
  cargo_msg('required')
end

#inform_user_about_cargo ⇒ Object

Inform the user about cargo if it doesn't exist.

If optional_rust_extension is true, print message to STDERR. Otherwise, raise an exception.



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# File 'lib/thermite/cargo.rb', line 76

def inform_user_about_cargo
  raise cargo_required_msg unless options[:optional_rust_extension]

  $stderr.write(cargo_recommended_msg)
end

#run_cargo(*args) ⇒ Object

Run cargo with the given args and return STDOUT.



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# File 'lib/thermite/cargo.rb', line 37

def run_cargo(*args)
  Dir.chdir(config.rust_toplevel_dir) do
    sh cargo, *args
  end
end

#run_cargo_if_exists(*args) ⇒ Object

Only run_cargo if it is found in the executable paths.



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# File 'lib/thermite/cargo.rb', line 46

def run_cargo_if_exists(*args)
  run_cargo(*args) if cargo
end

#run_cargo_rustc(target) ⇒ Object

Run cargo rustc, given a target (i.e., release [default] or debug).



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# File 'lib/thermite/cargo.rb', line 53

def run_cargo_rustc(target)
  cargo_args = %w[rustc]
  cargo_args.push(*cargo_manifest_path_args)
  cargo_args << '--release' if target == 'release'
  cargo_args.push(*cargo_rustc_args)
  run_cargo(*cargo_args)
end