add basic cli info

Cargo.toml

@@ -3,16 +3,19 @@ name = "rust-pip"
 version = "0.0.1"
 edition = "2021"
 description = "WORK IN PROGRESS: Pip rewritten in Rust"
-authors = [
-    "Jan Bronicki janbronicki@gmail.com",
-]
+authors = ["Jan Bronicki janbronicki@gmail.com"]
 license = "MIT"
 readme = "README.md"
-
+repository = "https://github.com/John15321/rust-pip"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = { version = "1.0.58", features = ["backtrace"] }
+reqwest = { version = "0.11", features = ["blocking", "json"] }
+structopt = { version = "0.3.26", features = ["color"] }
+strum = "0.24.1"
+strum_macros = "0.24.2"
 
 
 [dev-dependencies]

src/main.rs

@@ -1,3 +1,61 @@
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+/// A basic example
+#[derive(StructOpt, Debug)]
+#[structopt(name = "rust-pip", about = "Python package manager written in Rust.")]
+enum Opt {
+    /// Install packages.
+    Install {},
+    /// Download packages.
+    Download {
+        #[structopt(short = "n", long = "name")]
+        name: String,
+        #[structopt(short = "i", long = "index", default_value = "https://pypi.org/")]
+        index: String,
+    },
+    /// Uninstall packages.
+    Uninstall {},
+    /// List installed packages.
+    List {},
+    /// Show information about installed packages.
+    Show {},
+    /// Output installed packages in requirements format.
+    Freeze {},
+    /// Verify installed packages have compatible dependencies.
+    Check {},
+    /// Manage local and global configuration.
+    Config {},
+    /// Search PyPI for packages.
+    Search {},
+    /// Inspect and manage pip's wheel cache.
+    Cache {},
+    /// Inspect information available from package indexes.
+    Index {},
+    /// Build wheels from your requirements.
+    Wheel {},
+    /// Compute hashes of package archives.
+    Hash {},
+    /// A helper command used for command completion.
+    Completion {},
+    /// Show information useful for debugging.
+    Debug {},
+    /// Show help for commands.
+    Help {},
+}
+
+fn download_package(package_name: String, package_index: &String) {}
+
 fn main() {
-    println!("Hello, world!");
+    let opt = Opt::from_args();
+    println!("{:#?}", opt);
+
+    match opt {
+        Opt::Download { name, index } => {
+            println!("Package name {:?}", name);
+            println!("Index name: {:?}", index);
+            download_package(name, &index);
+        }
+        _ => todo!(),
+    }
 }