Use clap for CLI argument parsing

Cargo.toml

@@ -34,6 +34,7 @@ base64 = "0.13"
 cargo-registry-s3 = { path = "src/s3", version = "0.2.0" }
 chrono = { version = "0.4.0", features = ["serde"] }
 civet = "0.12.0-alpha.4"
+clap = "=3.0.0-beta.2"
 comrak = { version = "0.8", default-features = false }
 
 conduit = "0.9.0-alpha.3"
@@ -50,7 +51,6 @@ ctrlc = { version = "3.0", features = ["termination"] }
 derive_deref = "1.1.1"
 diesel = { version = "1.4.0", features = ["postgres", "serde_json", "chrono", "r2d2"] }
 diesel_full_text_search = "1.0.0"
-docopt = "1.0"
 dotenv = "0.15"
 env_logger = "0.8"
 failure = "0.1.1"

src/bin/delete-crate.rs

@@ -1,20 +1,21 @@
-// Purge all references to a crate from the database.
-//
-// Please be super sure you want to do this before running this.
-//
-// Usage:
-//      cargo run --bin delete-crate crate-name
-
 #![warn(clippy::all, rust_2018_idioms)]
 
 use cargo_registry::{db, models::Crate, schema::crates};
-use std::{
-    env,
-    io::{self, prelude::*},
-};
+use std::io::{self, prelude::*};
 
+use clap::Clap;
 use diesel::prelude::*;
 
+#[derive(Clap, Debug)]
+#[clap(
+    name = "delete-crate",
+    about = "Purge all references to a crate from the database.\n\nPlease be super sure you want to do this before running this."
+)]
+struct Opts {
+    /// Name of the crate
+    crate_name: String,
+}
+
 fn main() {
     let conn = db::connect_now().unwrap();
     conn.transaction::<_, diesel::result::Error, _>(|| {
@@ -25,18 +26,12 @@ fn main() {
 }
 
 fn delete(conn: &PgConnection) {
-    let name = match env::args().nth(1) {
-        None => {
-            println!("needs a crate-name argument");
-            return;
-        }
-        Some(s) => s,
-    };
-
-    let krate: Crate = Crate::by_name(&name).first(conn).unwrap();
+    let opts: Opts = Opts::parse();
+
+    let krate: Crate = Crate::by_name(&opts.crate_name).first(conn).unwrap();
     print!(
         "Are you sure you want to delete {} ({}) [y/N]: ",
-        name, krate.id
+        opts.crate_name, krate.id
     );
     io::stdout().flush().unwrap();
     let mut line = String::new();

src/bin/delete-version.rs

@@ -1,24 +1,27 @@
-// Purge all references to a crate's version from the database.
-//
-// Please be super sure you want to do this before running this.
-//
-// Usage:
-//      cargo run --bin delete-version crate-name version-number
-
 #![warn(clippy::all, rust_2018_idioms)]
 
 use cargo_registry::{
     db,
     models::{Crate, Version},
     schema::versions,
 };
-use std::{
-    env,
-    io::{self, prelude::*},
-};
+use std::io::{self, prelude::*};
 
+use clap::Clap;
 use diesel::prelude::*;
 
+#[derive(Clap, Debug)]
+#[clap(
+    name = "delete-version",
+    about = "Purge all references to a crate's version from the database.\n\nPlease be super sure you want to do this before running this."
+)]
+struct Opts {
+    /// Name of the crate
+    crate_name: String,
+    /// Version number that should be deleted
+    version: String,
+}
+
 fn main() {
     let conn = db::connect_now().unwrap();
     conn.transaction::<_, diesel::result::Error, _>(|| {
@@ -29,29 +32,16 @@ fn main() {
 }
 
 fn delete(conn: &PgConnection) {
-    let name = match env::args().nth(1) {
-        None => {
-            println!("needs a crate-name argument");
-            return;
-        }
-        Some(s) => s,
-    };
-    let version = match env::args().nth(2) {
-        None => {
-            println!("needs a version argument");
-            return;
-        }
-        Some(s) => s,
-    };
+    let opts: Opts = Opts::parse();
 
-    let krate: Crate = Crate::by_name(&name).first(conn).unwrap();
+    let krate: Crate = Crate::by_name(&opts.crate_name).first(conn).unwrap();
     let v: Version = Version::belonging_to(&krate)
-        .filter(versions::num.eq(&version))
+        .filter(versions::num.eq(&opts.version))
         .first(conn)
         .unwrap();
     print!(
         "Are you sure you want to delete {}#{} ({}) [y/N]: ",
-        name, version, v.id
+        opts.crate_name, opts.version, v.id
     );
     io::stdout().flush().unwrap();
     let mut line = String::new();

src/bin/populate.rs

@@ -1,17 +1,21 @@
-// Populate a set of dummy download statistics for a specific version in the
-// database.
-//
-// Usage:
-//      cargo run --bin populate version_id1 version_id2 ...
-
 #![warn(clippy::all, rust_2018_idioms)]
 
 use cargo_registry::{db, schema::version_downloads};
-use std::env;
 
+use clap::Clap;
 use diesel::prelude::*;
 use rand::{thread_rng, Rng};
 
+#[derive(Clap, Debug)]
+#[clap(
+    name = "populate",
+    about = "Populate a set of dummy download statistics for a specific version in the database."
+)]
+struct Opts {
+    #[clap(required = true)]
+    version_ids: Vec<i32>,
+}
+
 fn main() {
     let conn = db::connect_now().unwrap();
     conn.transaction(|| update(&conn)).unwrap();
@@ -20,10 +24,9 @@ fn main() {
 fn update(conn: &PgConnection) -> QueryResult<()> {
     use diesel::dsl::*;
 
-    let ids = env::args()
-        .skip(1)
-        .filter_map(|arg| arg.parse::<i32>().ok());
-    for id in ids {
+    let opts: Opts = Opts::parse();
+
+    for id in opts.version_ids {
         let mut rng = thread_rng();
         let mut dls = rng.gen_range(5_000i32, 10_000);