diff --git a/src/lib.rs b/src/lib.rs
index d2279ef..5ea8379 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,7 @@ extern crate core;
 
 pub mod commands;
 
-use crate::commands::CargoCommand;
+use crate::commands::{CargoCommand, Input};
 use cargo_metadata::{Message, MetadataCommand};
 use core::fmt;
 use rustc_version::Channel;
@@ -14,6 +14,42 @@ use std::process::{Command, ExitStatus, Stdio};
 use std::{env, io, process};
 use tee::TeeReader;
 
+const DEFAULT_MESSAGE_FORMAT: &str = "json-render-diagnostics";
+
+pub fn get_should_link(input: &mut Input) -> bool {
+    input.cmd == CargoCommand::Build
+        || (input.cmd == CargoCommand::Test
+            && if input.cargo_opts.contains(&"--no-run".to_string()) {
+                false
+            } else {
+                input.cargo_opts.push("--no-run".to_string());
+                true
+            })
+}
+
+pub fn get_message_format(input: &mut Input) -> String {
+    if let Some(pos) = input
+        .cargo_opts
+        .iter()
+        .position(|s| s.starts_with("--message-format"))
+    {
+        let arg = input.cargo_opts.remove(pos);
+        let format = if let Some((_, format)) = arg.split_once('=') {
+            format.to_string()
+        } else {
+            input.cargo_opts.remove(pos)
+        };
+        if !format.starts_with("json") {
+            eprintln!("error: non-JSON `message-format` is not supported");
+            process::exit(1);
+        } else {
+            format
+        }
+    } else {
+        DEFAULT_MESSAGE_FORMAT.to_string()
+    }
+}
+
 pub fn build_elf(
     cmd: CargoCommand,
     message_format: &str,
@@ -25,7 +61,7 @@ pub fn build_elf(
 
     let mut tee_reader;
     let mut stdout_reader;
-    let buf_reader: &mut dyn BufRead = if message_format == "json-render-diagnostics" {
+    let buf_reader: &mut dyn BufRead = if message_format == DEFAULT_MESSAGE_FORMAT {
         stdout_reader = BufReader::new(command_stdout);
         &mut stdout_reader
     } else {
diff --git a/src/main.rs b/src/main.rs
index 6897aaa..cda6c62 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,8 @@
-use cargo_3ds::commands::{Cargo, CargoCommand};
-use cargo_3ds::{build_3dsx, build_elf, build_smdh, check_rust_version, get_metadata, link};
+use cargo_3ds::commands::Cargo;
+use cargo_3ds::{
+    build_3dsx, build_elf, build_smdh, check_rust_version, get_message_format, get_metadata,
+    get_should_link, link,
+};
 use clap::Parser;
 use std::process;
 
@@ -8,35 +11,8 @@ fn main() {
 
     let Cargo::Input(mut input) = Cargo::parse();
 
-    let should_link = input.cmd == CargoCommand::Build
-        || (input.cmd == CargoCommand::Test
-            && if input.cargo_opts.contains(&"--no-run".to_string()) {
-                false
-            } else {
-                input.cargo_opts.push("--no-run".to_string());
-                true
-            });
-
-    let message_format = if let Some(pos) = input
-        .cargo_opts
-        .iter()
-        .position(|s| s.starts_with("--message-format"))
-    {
-        let arg = input.cargo_opts.remove(pos);
-        let format = if let Some((_, format)) = arg.split_once('=') {
-            format.to_string()
-        } else {
-            input.cargo_opts.remove(pos)
-        };
-        if !format.starts_with("json") {
-            eprintln!("error: non-JSON `message-format` is not supported");
-            process::exit(1);
-        } else {
-            format
-        }
-    } else {
-        "json-render-diagnostics".to_string()
-    };
+    let should_link = get_should_link(&mut input);
+    let message_format = get_message_format(&mut input);
 
     let (status, messages) = build_elf(input.cmd, &message_format, &input.cargo_opts);