diff --git a/src/main.rs b/src/main.rs
index e7a11a9..2ba387f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+mod notes;
+
 fn main() {
     println!("Hello, world!");
 }
diff --git a/src/notes.rs b/src/notes.rs
new file mode 100644
index 0000000..8811e78
--- /dev/null
+++ b/src/notes.rs
@@ -0,0 +1,35 @@
+use anyhow::Result;
+use chrono::Utc;
+use std::{env, fs, process::Command};
+
+fn get_base_path() -> Result<String> {
+    let home = env::var("HOME")?;
+    Ok(format!("{}/.rnote/", home))
+}
+
+fn get_path(category: &str) -> Result<String> {
+    let base = get_base_path()?;
+    let date = Utc::now().format("%Y-%m-%d");
+    match category.is_empty() {
+        true => Ok(format!("{}{}", base, date)),
+        false => Ok(format!("{}{}", base, category)),
+    }
+}
+
+pub fn create_dir(category: &str) -> Result<()> {
+    let path = get_base_path()?;
+    let date = Utc::now().format("%Y-%m-%d");
+    match category.is_empty() {
+        true => fs::create_dir_all(format!("{}{}", path, date))?,
+        false => fs::create_dir_all(format!("{}{}", path, category))?,
+    }
+    Ok(())
+}
+
+pub fn create_note(header: &str, category: &str) -> Result<()> {
+    let editor = env::var("EDITOR").unwrap_or("/bin/vi".to_owned());
+    let path = format!("{}{}", get_path(category)?, header);
+    // TODO: check if duplicate
+    Command::new(editor).arg(&path).status()?;
+    Ok(())
+}