Add CLI for URI::PackageURL

[giterlizzi]

purl-tool with JSON output format:

purl-tool pkg:cpan/GDT/URI-PackageURL@2.00 | jq
{
  "name": "URI-PackageURL",
  "namespace": "GDT",
  "qualifiers": {},
  "subpath": null,
  "type": "cpan",
  "version": "2.00"
}

purl-tool with ENV output format:

purl-tool pkg:cpan/GDT/URI-PackageURL@2.00 --env
PURL="pkg:cpan/GDT/URI-PackageURL@2.00"
PURL_TYPE="cpan"
PURL_NAMESPACE="GDT"
PURL_NAME="URI-PackageURL"
PURL_VERSION="2.00"
PURL_SUBPATH=""
PURL_QUALIFIERS=""
PURL_DOWNLOAD_URL="http://www.cpan.org/authors/id/G/GD/GDT/URI-PackageURL-2.00.tar.gz"
PURL_REPOSITORY_URL="https://metacpan.org/release/GDT/URI-PackageURL-2.00"

purl-tool with YAML output format:

purl-tool pkg:cpan/GDT/URI-PackageURL@2.00 --yaml
--- !!perl/hash:URI::PackageURL
name: URI-PackageURL
namespace: GDT
qualifiers: {}
scheme: pkg
subpath: ~
type: cpan
version: '2.00'

Download package using PackageURL string:
wget $(purl-tool --download-url 'pkg:cpan/GDT/URI-PackageURL@2.00' )

Use ENV variables inside shell-script:

#!bash

eval $(perl -Ilib bin/purl-tool --parse 'pkg:cpan/GDT/URI-PackageURL@2.00' --env)

echo "Download $PURL"
wget $PURL_DOWNLOAD_URL