feat: add a generator for shell completions

crates/aiken/Cargo.toml

@@ -31,6 +31,7 @@ aiken-lang = { path = "../aiken-lang", version = "1.0.13-alpha" }
 aiken-lsp = { path = "../aiken-lsp", version = "1.0.13-alpha" }
 aiken-project = { path = '../aiken-project', version = "1.0.13-alpha" }
 uplc = { path = '../uplc', version = "1.0.13-alpha" }
+clap_complete = "4.3.2"
 
 [build-dependencies]
 built = { version = "0.6.0", features = ["git2"] }

crates/aiken/src/cmd/completion.rs

@@ -0,0 +1,28 @@
+use clap::{Subcommand, Command};
+use clap_complete::{Shell, generate};
+
+use crate::cmd::Cmd as MainCmd;
+
+/// Generates shell completion scripts
+#[derive(Subcommand)]
+pub enum Cmd {
+    Bash,
+    Zsh,
+    Fish
+}
+
+pub fn exec(sub_cmd: Cmd) -> miette::Result<()> {
+    let shell = match sub_cmd {
+        Cmd::Bash => Shell::Bash,
+        Cmd::Zsh => Shell::Zsh,
+        Cmd::Fish => Shell::Fish
+    };
+
+    let cli = Command::new("aiken").disable_version_flag(true);
+
+    let mut main = MainCmd::augment_subcommands(cli);
+
+    generate(shell, &mut main, "aiken".to_string(), &mut std::io::stdout());
+
+    Ok(())
+}

crates/aiken/src/cmd/mod.rs

@@ -1,6 +1,9 @@
+use clap::Parser;
+
 pub mod blueprint;
 pub mod build;
 pub mod check;
+pub mod completion;
 pub mod docs;
 pub mod fmt;
 pub mod lsp;
@@ -8,3 +11,51 @@ pub mod new;
 pub mod packages;
 pub mod tx;
 pub mod uplc;
+
+use crate::built_info;
+
+/// Aiken: a smart-contract language and toolchain for Cardano
+#[derive(Parser)]
+#[clap(version = version(), about, long_about = None)]
+#[clap(propagate_version = true)]
+pub enum Cmd {
+    New(new::Args),
+    Fmt(fmt::Args),
+    Build(build::Args),
+    Address(blueprint::address::Args),
+    Check(check::Args),
+    Docs(docs::Args),
+    Add(packages::add::Args),
+
+    #[clap(subcommand)]
+    Blueprint(blueprint::Cmd),
+
+    #[clap(subcommand)]
+    Packages(packages::Cmd),
+
+    #[clap(subcommand)]
+    Tx(tx::Cmd),
+
+    #[clap(subcommand)]
+    Uplc(uplc::Cmd),
+
+    #[clap(subcommand)]
+    Completion(completion::Cmd),
+
+    #[clap(hide = true)]
+    Lsp(lsp::Args),
+}
+
+impl Default for Cmd {
+    fn default() -> Self {
+        Self::parse()
+    }
+}
+
+fn version() -> String {
+    format!(
+        "v{} {}",
+        built_info::PKG_VERSION,
+        built_info::GIT_COMMIT_HASH_SHORT.unwrap_or("unknown")
+    )
+}

crates/aiken/src/cmd/packages/add.rs

@@ -22,7 +22,7 @@ pub struct Args {
     #[clap(long)]
     pub version: String,
 
-    #[clap(hide = true)]
+    #[clap(hide = true, long)]
     pub overwrite: bool,
 }
 

crates/aiken/src/main.rs

@@ -1,50 +1,15 @@
 use aiken::{
-    built_info,
     cmd::{
+        Cmd,
         blueprint::{self, address},
         build, check, docs, fmt, lsp, new,
         packages::{self, add},
-        tx, uplc,
+        tx, uplc, completion,
     },
 };
-use clap::Parser;
+
 use owo_colors::OwoColorize;
 
-/// Aiken: a smart-contract language and toolchain for Cardano
-#[derive(Parser)]
-#[clap(version = version(), about, long_about = None)]
-#[clap(propagate_version = true)]
-pub enum Cmd {
-    New(new::Args),
-    Fmt(fmt::Args),
-    Build(build::Args),
-    Address(address::Args),
-    Check(check::Args),
-    Docs(docs::Args),
-    Add(add::Args),
-
-    #[clap(subcommand)]
-    Blueprint(blueprint::Cmd),
-
-    #[clap(subcommand)]
-    Packages(packages::Cmd),
-
-    #[clap(subcommand)]
-    Tx(tx::Cmd),
-
-    #[clap(subcommand)]
-    Uplc(uplc::Cmd),
-
-    #[clap(hide = true)]
-    Lsp(lsp::Args),
-}
-
-impl Default for Cmd {
-    fn default() -> Self {
-        Self::parse()
-    }
-}
-
 fn main() -> miette::Result<()> {
     panic_handler();
 
@@ -61,17 +26,10 @@ fn main() -> miette::Result<()> {
         Cmd::Lsp(args) => lsp::exec(args),
         Cmd::Tx(sub_cmd) => tx::exec(sub_cmd),
         Cmd::Uplc(sub_cmd) => uplc::exec(sub_cmd),
+        Cmd::Completion(sub_cmd) => completion::exec(sub_cmd)
     }
 }
 
-fn version() -> String {
-    format!(
-        "v{} {}",
-        built_info::PKG_VERSION,
-        built_info::GIT_COMMIT_HASH_SHORT.unwrap_or("unknown")
-    )
-}
-
 fn panic_handler() {
     std::panic::set_hook(Box::new(move |info| {
         let message = info