Supporting auto complete and a build-release script

src/main.rs

@@ -1,4 +1,5 @@
-use clap::{Parser, Subcommand};
+use clap::{CommandFactory, Parser, Subcommand};
+use clap_complete::{generate, Shell};
 use colored::*;
 use anyhow::Result;
 use anvil::version::ANVIL_VERSION;
@@ -167,6 +168,12 @@ enum Commands {
         dir: Option<String>,
     },
 
+    /// Generate shell completion scripts
+    Completions {
+        /// Shell to generate completions for (bash, zsh, fish, powershell)
+        shell: Shell,
+    },
+
     /// View pin maps, assign pins, and audit wiring
     Pin {
         /// Capability filter (pwm, analog, spi, i2c, uart, interrupt)
@@ -228,7 +235,11 @@ fn main() -> Result<()> {
 
     let cli = Cli::parse();
 
-    print_banner();
+    // Completions output must be clean -- no banner
+    let is_completions = matches!(cli.command, Commands::Completions { .. });
+    if !is_completions {
+        print_banner();
+    }
 
     match cli.command {
         Commands::New { name, template, board, list_templates, list_boards } => {
@@ -352,6 +363,11 @@ fn main() -> Result<()> {
                 commands::lib::list_libraries(dir.as_deref())
             }
         }
+        Commands::Completions { shell } => {
+            let mut cmd = Cli::command();
+            generate(shell, &mut cmd, "anvil", &mut std::io::stdout());
+            Ok(())
+        }
         Commands::Pin {
             name, pin, assign, remove, audit, brief,
             generate, capabilities, init_from, mode, cs, board, dir,