upgrade from structopt to clap 3

xtask/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 aya-gen = { path = "../aya-gen" }
-structopt = {version = "0.3", default-features = false }
+clap = { version = "3", features = ["derive"] }
 anyhow = "1"
 syn = "1"
 quote = "1"

xtask/src/codegen/mod.rs

@@ -4,7 +4,7 @@ mod helpers;
 
 use std::path::PathBuf;
 
-use structopt::StructOpt;
+use clap::Parser;
 
 const SUPPORTED_ARCHS: &[Architecture] = &[
     Architecture::X86_64,
@@ -52,34 +52,34 @@ impl std::fmt::Display for Architecture {
     }
 }
 
-#[derive(StructOpt)]
+#[derive(Parser)]
 pub struct Options {
-    #[structopt(long)]
+    #[clap(long)]
     libbpf_dir: PathBuf,
 
     // sysroot options. Default to ubuntu headers installed by the
     // libc6-dev-{arm64,armel}-cross packages.
-    #[structopt(long, default_value = "/usr/include/x86_64-linux-gnu")]
+    #[clap(long, default_value = "/usr/include/x86_64-linux-gnu")]
     x86_64_sysroot: PathBuf,
 
-    #[structopt(long, default_value = "/usr/aarch64-linux-gnu/include")]
+    #[clap(long, default_value = "/usr/aarch64-linux-gnu/include")]
     aarch64_sysroot: PathBuf,
 
-    #[structopt(long, default_value = "/usr/arm-linux-gnueabi/include")]
+    #[clap(long, default_value = "/usr/arm-linux-gnueabi/include")]
     armv7_sysroot: PathBuf,
 
-    #[structopt(long, default_value = "/usr/riscv64-linux-gnu/include")]
+    #[clap(long, default_value = "/usr/riscv64-linux-gnu/include")]
     riscv64_sysroot: PathBuf,
 
-    #[structopt(subcommand)]
+    #[clap(subcommand)]
     command: Option<Command>,
 }
 
-#[derive(StructOpt)]
+#[derive(Parser)]
 enum Command {
-    #[structopt(name = "aya")]
+    #[clap(name = "aya")]
     Aya,
-    #[structopt(name = "aya-bpf-bindings")]
+    #[clap(name = "aya-bpf-bindings")]
     AyaBpfBindings,
 }
 

xtask/src/main.rs

@@ -3,21 +3,21 @@ mod docs;
 
 use std::process::exit;
 
-use structopt::StructOpt;
-#[derive(StructOpt)]
+use clap::Parser;
+#[derive(Parser)]
 pub struct Options {
-    #[structopt(subcommand)]
+    #[clap(subcommand)]
     command: Command,
 }
 
-#[derive(StructOpt)]
+#[derive(Parser)]
 enum Command {
     Codegen(codegen::Options),
     Docs,
 }
 
 fn main() {
-    let opts = Options::from_args();
+    let opts = Options::parse();
 
     use Command::*;
     let ret = match opts.command {