feat: cli completions

cli/Cargo.toml

@@ -23,7 +23,8 @@ base64 = "0.21"
 bincode = "1.3.3"
 cargo_toml = "0.19.2"
 chrono = "0.4.19"
-clap = { version = "4.2.4", features = ["derive"] }
+clap = { version = "4.5.17", features = ["derive"] }
+clap_complete = "4.5.26"
 dirs = "4.0"
 flate2 = "1.0.19"
 heck = "0.4.0"

cli/src/lib.rs

@@ -10,7 +10,8 @@ use anchor_lang_idl::convert::convert_idl;
 use anchor_lang_idl::types::{Idl, IdlArrayLen, IdlDefinedFields, IdlType, IdlTypeDefTy};
 use anyhow::{anyhow, Context, Result};
 use checks::{check_anchor_version, check_idl_build_feature, check_overflow};
-use clap::Parser;
+use clap::{CommandFactory, Parser};
+use clap_complete::generate;
 use dirs::home_dir;
 use flate2::read::GzDecoder;
 use flate2::read::ZlibDecoder;
@@ -365,6 +366,11 @@ pub enum Command {
         #[clap(long)]
         idl: Option<String>,
     },
+    /// Generates shell completions.
+    Completions {
+        #[clap(value_enum)]
+        shell: clap_complete::Shell,
+    },
 }
 
 #[derive(Debug, Parser)]
@@ -924,6 +930,15 @@ fn process_command(opts: Opts) -> Result<()> {
             address,
             idl,
         } => account(&opts.cfg_override, account_type, address, idl),
+        Command::Completions { shell } => {
+            generate(
+                shell,
+                &mut Opts::command(),
+                "anchor",
+                &mut std::io::stdout(),
+            );
+            Ok(())
+        }
     }
 }