Moved changes from #20

- Moved changes from #20 to 25-add-python-version-parsing-pep-440 branch

Author: Allstreamer

Cargo.lock

@@ -15,6 +15,10 @@ anyhow = { version = "1.0.58", features = ["backtrace"] }
 clap = { version = "3.2", features = ["derive"] }
 reqwest = { version = "0.11", features = ["blocking", "json"] }
 strum = { version = "0.24.1", features = ["derive"] }
-
+serde = { version = "1", features = ["derive"] }
+regex = { version = "1" }
+lazy_static = { version = "1.4.0" }
+pomsky-macro = { version = "0.6.0" }
+derivative = { version = "2.2.0" }
 
 [dev-dependencies]

Cargo.toml

@@ -1,5 +1,11 @@
 use clap::{AppSettings, Parser};
 
+#[macro_use]
+extern crate derivative;
+
+mod package_version;
+use package_version::PackageVersion;
+
 /// Python package manager written in Rust
 #[derive(Parser, Debug)]
 #[clap(global_setting = AppSettings::DeriveDisplayOrder)]
@@ -43,7 +49,10 @@ enum Opt {
     Help {},
 }
 
-fn download_package(_package_name: String, _package_index: &str) {}
+fn download_package(_package_name: String, _package_index: &str) {
+    // Version usage example
+    let _ = PackageVersion::new("v1.0");
+}
 
 fn main() {
     let opt = Opt::parse();