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# frozen_string_literal: true
require "open3"
require "psych"
module RbSys
module Cargo
# Extracts metadata from a Cargo project using `cargo metadata`.
class Metadata
attr_reader :name
# Initializes a new Cargo::Metadata instance.
#
# @param name [String] the name of the Cargo project
def initialize(name, deps: false)
raise ArgumentError, "name must be a String" unless name.is_a?(String)
@name = name
@cargo_metadata = nil
@package_metadata = nil
@deps = deps
end
# Returns the path where the Cargo project's Cargo.toml is located.
#
# @return [String]
def manifest_directory
@manifest_directory ||= File.dirname(manifest_path)
end
# Returns the target directory for the Cargo project.
#
# @return [String]
def target_directory
cargo_metadata.fetch("target_directory")
end
# Returns the workspace root for the Cargo project.
#
# @return [String]
def workspace_root
cargo_metadata.fetch("workspace_root")
end
# Returns the workspace members for the Cargo project.
#
# @return [Array<Hash>]
def packages
cargo_metadata.fetch("packages")
end
# Returns the path to the package's Cargo.toml.
#
# @return [String]
def manifest_path
package_metadata.fetch("manifest_path")
end
# Returns the package's version.
#
# @return [String]
def version
package_metadata.fetch("version")
end
# Returns the package's id.
#
# @return [String]
def id
package_metadata.fetch("id")
end
# Returns the package's Rust edition.
#
# @return [String]
def edition
package_metadata.fetch("edition")
end
# Returns the package's features.
#
# @return [Array<String>]
def features
package_metadata.fetch("features")
end
# Returns the package's custom metadata.
#
# @return [Hash]
def metadata
package_metadata.fetch("metadata")
end
# Returns the rb-sys version, if any.
def rb_sys_version
pkg = packages.find { |p| p.fetch("name") == "rb-sys" }
return unless pkg
pkg["version"]
end
private
def package_metadata
return @package_metadata if @package_metadata
found = cargo_metadata.fetch("packages").find { |p| p.fetch("name") == name }
raise PackageNotFoundError, @name unless found
@package_metadata = found
end
def cargo_metadata
return @cargo_metadata if @cargo_metadata
::Gem.load_yaml
cargo = ENV["CARGO"] || "cargo"
args = ["metadata", "--format-version", "1"]
args << "--no-deps" unless @deps
out, stderr, status = Open3.capture3(cargo, *args)
raise "exited with non-zero status (#{status})" unless status.success?
data = Gem::SafeYAML.safe_load(out)
raise "metadata must be a Hash" unless data.is_a?(Hash)
@cargo_metadata = data
rescue => err
raise CargoMetadataError.new(err, stderr)
end
end
end
end
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