diff --git a/src/cli.rs b/src/cli.rs
new file mode 100644
index 0000000..12dd64e
--- /dev/null
+++ b/src/cli.rs
@@ -0,0 +1,82 @@
+//! Global CLI Setup.
+
+use clap::{App, AppSettings, Arg};
+use crate::command;
+
+macro_rules! register_command {
+    ($module:ident, $app:ident) => {
+        $app = $app.subcommand(command::$module::subcommand());
+    };
+}
+
+macro_rules! handle_command {
+    ($module:ident, $matches:ident) => {
+        if let Some(sub_matches) = $matches.subcommand_matches(stringify!($module)) {
+            command::$module::run(&$matches, &sub_matches).await;
+            return;
+        }
+    };
+    ($name:expr, $module:ident, $matches:ident) => {
+        if let Some(sub_matches) = $matches.subcommand_matches($name) {
+            command::$module::run(&$matches, &sub_matches).await;
+            return;
+        }
+    };
+}
+
+pub fn build_cli() -> App<'static, 'static> {
+    let mut app = App::new("Colmena")
+        .version("0.1.0")
+        .author("Zhaofeng Li <hello@zhaofeng.li>")
+        .about("NixOS deployment tool")
+        .global_setting(AppSettings::ColoredHelp)
+        .setting(AppSettings::ArgRequiredElseHelp)
+        .arg(Arg::with_name("config")
+            .short("f")
+            .long("config")
+            .value_name("CONFIG")
+            .help("Path to a Hive expression")
+
+            // The default value is a lie (sort of)!
+            //
+            // The default behavior is to search upwards from the
+            // current working directory for a file named "hive.nix".
+            // This behavior is disabled if --config/-f is explicitly
+            // supplied by the user (occurrences_of > 0).
+            .default_value("hive.nix")
+            .long_help(r#"If this argument is not specified, Colmena will search upwards from the current working directory for a file named "hive.nix". This behavior is disabled if --config/-f is given explicitly.
+
+For a sample configuration, see <https://github.com/zhaofengli/colmena>.
+"#)
+            .global(true))
+        .arg(Arg::with_name("show-trace")
+            .long("show-trace")
+            .help("Show debug information for Nix commands")
+            .long_help("Passes --show-trace to Nix commands")
+            .global(true)
+            .takes_value(false));
+
+    register_command!(apply, app);
+    register_command!(apply_local, app);
+    register_command!(build, app);
+    register_command!(introspect, app);
+    register_command!(upload_keys, app);
+    register_command!(exec, app);
+
+    app
+}
+
+pub async fn run() {
+    let mut app = build_cli();
+    let matches = app.clone().get_matches();
+
+    handle_command!(apply, matches);
+    handle_command!("apply-local", apply_local, matches);
+    handle_command!(build, matches);
+    handle_command!(introspect, matches);
+    handle_command!("upload-keys", upload_keys, matches);
+    handle_command!(exec, matches);
+
+    app.print_long_help().unwrap();
+    println!();
+}
diff --git a/src/main.rs b/src/main.rs
index 35c19d5..b69620a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,85 +1,15 @@
 use std::env;
-use clap::{App, AppSettings, Arg};
 
 mod nix;
+mod cli;
 mod command;
 mod progress;
 mod util;
 
-macro_rules! command {
-    ($module:ident, $matches:ident) => {
-        if let Some(sub_matches) = $matches.subcommand_matches(stringify!($module)) {
-            command::$module::run(&$matches, &sub_matches).await;
-            return;
-        }
-    };
-    ($name:expr, $module:ident, $matches:ident) => {
-        if let Some(sub_matches) = $matches.subcommand_matches($name) {
-            command::$module::run(&$matches, &sub_matches).await;
-            return;
-        }
-    };
-}
-
-macro_rules! bind_command {
-    ($module:ident, $app:ident) => {
-        $app = $app.subcommand(command::$module::subcommand());
-    };
-}
-
 #[tokio::main]
 async fn main() {
     init_logging();
-
-    let mut app = App::new("Colmena")
-        .version("0.1.0")
-        .author("Zhaofeng Li <hello@zhaofeng.li>")
-        .about("NixOS deployment tool")
-        .global_setting(AppSettings::ColoredHelp)
-        .setting(AppSettings::ArgRequiredElseHelp)
-        .arg(Arg::with_name("config")
-            .short("f")
-            .long("config")
-            .value_name("CONFIG")
-            .help("Path to a Hive expression")
-
-            // The default value is a lie (sort of)!
-            //
-            // The default behavior is to search upwards from the
-            // current working directory for a file named "hive.nix".
-            // This behavior is disabled if --config/-f is explicitly
-            // supplied by the user (occurrences_of > 0).
-            .default_value("hive.nix")
-            .long_help(r#"If this argument is not specified, Colmena will search upwards from the current working directory for a file named "hive.nix". This behavior is disabled if --config/-f is given explicitly.
-
-For a sample configuration, see <https://github.com/zhaofengli/colmena>.
-"#)
-            .global(true))
-        .arg(Arg::with_name("show-trace")
-            .long("show-trace")
-            .help("Show debug information for Nix commands")
-            .long_help("Passes --show-trace to Nix commands")
-            .global(true)
-            .takes_value(false));
-
-    bind_command!(apply, app);
-    bind_command!(apply_local, app);
-    bind_command!(build, app);
-    bind_command!(introspect, app);
-    bind_command!(upload_keys, app);
-    bind_command!(exec, app);
-
-    let matches = app.clone().get_matches();
-
-    command!(apply, matches);
-    command!("apply-local", apply_local, matches);
-    command!(build, matches);
-    command!(introspect, matches);
-    command!("upload-keys", upload_keys, matches);
-    command!(exec, matches);
-
-    app.print_long_help().unwrap();
-    println!();
+    cli::run().await;
 }
 
 fn init_logging() {