diff --git a/README.md b/README.md
index 6a6ba0e..96fd142 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
-# Rust SHell eXtended
+# Rust SHell eXtensible
 
 Learning rust by making a shell.
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..55d2794
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,52 @@
+pub mod core;
+pub mod inbuilt;
+
+pub use core::*;
+pub use inbuilt::*;
+
+// Helper function for resolving aliases.
+pub fn resolve_alias(config: &mlua::Table, cmd: &str) -> Option<String> {
+    config
+        .get::<mlua::Table>("shellAliases")
+        .ok()
+        .and_then(|aliases| aliases.get(cmd).ok())
+}
+
+// Return prompt from configuration file with expansion performed.
+// Otherwise return default prompt.
+pub fn resolve_prompt(config: &mlua::Table) -> String {
+    let default_prompt = "[${user}@${host}:${dir}]$".to_string();
+
+    let prompt = config
+        .get::<String>("prompt")
+        .unwrap_or(default_prompt)
+        + " ";
+
+    shellexpand::env_with_context_no_errors(&prompt, context).to_string()
+}
+
+// Format current working directory.
+fn fmt_cwd() -> String {
+    let home = std::env::var("HOME").unwrap_or_default();
+    let cwd = std::env::current_dir()
+        .ok()
+        .and_then(|p| p.to_str().map(String::from))
+        .unwrap_or_default();
+
+    // Replace $HOME with ~.
+    if cwd.starts_with(&home) {
+        cwd.replacen(&home, "~", 1)
+    } else {
+        cwd
+    }
+}
+
+// Context for shell expansion.
+fn context(s: &str) -> Option<String> {
+    match s {
+        "user" => Some(whoami::username()),
+        "host" => Some(whoami::devicename()),
+        "dir" => Some(fmt_cwd()),
+        _ => None,
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index a115939..4c39cad 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,58 +1,6 @@
-mod core;
-use core::*;
-
-mod inbuilt;
-use inbuilt::*;
-
+use rshx::*;
 use mlua::prelude::*;
 
-// Helper function for resolving aliases.
-fn resolve_alias(config: &mlua::Table, cmd: &str) -> Option<String> {
-    config
-        .get::<mlua::Table>("shellAliases")
-        .ok()
-        .and_then(|aliases| aliases.get(cmd).ok())
-}
-
-// Return prompt from configuration file with expansion performed.
-// Otherwise return default prompt.
-fn resolve_prompt(config: &mlua::Table) -> String {
-    let default_prompt = "[${user}@${host}:${cwd}]$".to_string();
-
-    let prompt = config
-        .get::<String>("prompt")
-        .unwrap_or(default_prompt)
-        + " ";
-
-    shellexpand::env_with_context_no_errors(&prompt, context).to_string()
-}
-
-// Format current working directory.
-fn fmt_cwd() -> String {
-    let home = std::env::var("HOME").unwrap_or_default();
-    let cwd = std::env::current_dir()
-        .ok()
-        .and_then(|p| p.to_str().map(String::from))
-        .unwrap_or_default();
-
-    // Replace $HOME with ~.
-    if cwd.starts_with(&home) {
-        cwd.replacen(&home, "~", 1)
-    } else {
-        cwd
-    }
-}
-
-// Context for shell expansion.
-fn context(s: &str) -> Option<String> {
-    match s {
-        "user" => Some(whoami::username()),
-        "host" => Some(whoami::devicename()),
-        "cwd" => Some(fmt_cwd()),
-        _ => None,
-    }
-}
-
 fn main() {
     // Create a new Lua state and load the safe subset of the standard libraries.
     let lua = Lua::new();