Add .copy CLI command

cli/app.rs

@@ -713,6 +713,11 @@ impl Limbo {
                         HeadersMode::Off => false,
                     };
                 }
+                Command::Copy(args) => {
+                    if let Err(e) = self.conn.copy_db(&args.output_file) {
+                        let _ = self.writeln(e.to_string());
+                    }
+                }
             },
         }
     }

cli/commands/args.rs

@@ -143,6 +143,11 @@ pub struct HeadersArgs {
     pub mode: HeadersMode,
 }
 
+#[derive(Debug, Clone, Args)]
+pub struct CopyArgs {
+    pub output_file: String,
+}
+
 #[derive(ValueEnum, Copy, Clone, Debug, PartialEq, Eq)]
 pub enum HeadersMode {
     On,

cli/commands/mod.rs

@@ -9,7 +9,10 @@ use args::{
 use clap::Parser;
 use import::ImportArgs;
 
-use crate::input::{AFTER_HELP_MSG, BEFORE_HELP_MSG};
+use crate::{
+    commands::args::CopyArgs,
+    input::{AFTER_HELP_MSG, BEFORE_HELP_MSG},
+};
 
 #[derive(Parser, Debug)]
 #[command(
@@ -86,6 +89,8 @@ pub enum Command {
     /// Toggle column headers on/off in list mode
     #[command(name = "headers", display_name = ".headers")]
     Headers(HeadersArgs),
+    #[command(name = "copy", display_name = ".copy")]
+    Copy(CopyArgs),
 }
 
 const _HELP_TEMPLATE: &str = "{before-help}{name}