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+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
+
+[[package]]
+name = "winnow"
+version = "0.5.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7cf47b659b318dccbd69cc4797a39ae128f533dce7902a1096044d1967b9c16"
+dependencies = [
+ "memchr",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5fe890d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "lectern"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.4.16", features = ["derive"] }
+dirs = "5.0.1"
+regex = "1.10.2"
+serde = { version = "1.0.195", features = ["derive"] }
+tinytemplate = "1.2.1"
+toml = "0.8.8"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3dd5ca8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# lectern
+
+My lecture note manager. homework management coming soon tm
diff --git a/src/lecture.rs b/src/lecture.rs
new file mode 100644
index 0000000..462fd86
--- /dev/null
+++ b/src/lecture.rs
@@ -0,0 +1,91 @@
+use std::{
+    fs,
+    io,
+    path::PathBuf,
+};
+use tinytemplate::TinyTemplate;
+use regex::Regex;
+
+use crate::{Course, CourseContext, Config};
+
+fn init_lecture(course: &Course, config: &Config) {
+    let template_stream = fs::read(&config.template)
+        .expect("Couldn't open template.");
+    let template_string = String::from_utf8_lossy(&template_stream);
+
+    let mut template = TinyTemplate::new();
+    template.add_template("main", &template_string)
+        .expect("Failed initializing template.");
+
+    let context = CourseContext::from(&course, &config);
+
+    let rendered = template.render("main", &context)
+        .expect("Failed applying template");
+
+    let lecture_directory = config.root.join(&course.semester).join(&course.name)
+        .join("lecture");
+    fs::write(lecture_directory.join("main.tex"), rendered)
+        .expect("Failed making main.tex for course.");
+}
+
+fn detect_lessons(path: &PathBuf) -> io::Result<Vec<u32>> {
+    let mut lesson_numbers: Vec<u32> = Vec::new();
+    let dir_iter = fs::read_dir(path)?;
+    let pattern = Regex::new(r"les(\d+)\.tex").unwrap();
+
+    for entry in dir_iter {
+        let entry_path = entry?.path();
+        let name = entry_path.file_name().unwrap().to_string_lossy();
+        if let Some(caps) = pattern.captures(&name) {
+            let lesson_number = caps[1].parse::<u32>().unwrap();
+            lesson_numbers.push(lesson_number);
+        }
+    }
+
+    lesson_numbers.sort();
+
+    return Ok(lesson_numbers);
+}
+
+fn update_main(main_path: &PathBuf, new_lessons: String) -> io::Result<()> {
+    let main = fs::read(main_path)?;
+    let pattern = Regex::new(r"% start lessons\n( {4}\\input\{les(\d+)\.tex\}\n)* {4}% end lessons")
+        .unwrap();
+    let fmt_lessons = format!("% start lessons\n{}    %end lessons", new_lessons);
+    let main_string = String::from_utf8_lossy(&main);
+    let new_main = pattern.replace(&main_string, fmt_lessons);
+    fs::write(main_path, new_main.as_bytes())?;
+
+    Ok(())
+}
+
+pub fn new_lesson(course: &Course, config: &Config) -> String {
+    let lecture_directory = config.root.join(&course.semester).join(&course.name)
+        .join("lecture");
+
+    if !lecture_directory.try_exists().unwrap() {
+        fs::create_dir_all(&lecture_directory).unwrap();
+        init_lecture(course, config);
+    }
+
+    let mut lessons = detect_lessons(&lecture_directory)
+        .expect("Could not make sense of the lesson situation.");
+    let new_lesson = lessons.last().unwrap_or(&0).clone() + 1;
+
+    let lesson_file = format!("les{new_lesson}.tex");
+    let lesson_path = lecture_directory.join(lesson_file.clone());
+    fs::write(&lesson_path, format!("\\lesson{{{new_lesson}}}{{}}\n\n").as_bytes())
+        .expect("Unable to write to lesson file.");
+
+    lessons.push(new_lesson);
+
+    let mut lessons_string = String::new();
+
+    for num in lessons {
+        lessons_string.push_str(format!("    \\input{{les{num}.tex}}\n").as_str());
+    }
+
+    update_main(&lecture_directory.join("main.tex"), lessons_string)
+        .expect("Unable to update main.tex");
+    return lesson_file;
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..847d096
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,271 @@
+use std::{
+    path::PathBuf,
+    io::{self, Write},
+    process::{Command, Stdio},
+    collections::HashMap,
+    fs,
+};
+use lecture::new_lesson;
+use serde::{Deserialize, Serialize};
+use clap::{Parser, Subcommand, Args};
+
+mod lecture;
+
+#[derive(Parser)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+
+    /// Configuration file location
+    #[arg(short, long)]
+    config: Option<PathBuf>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Initialize a course
+    Init(InitArgs),
+
+    /// Open notes for a course
+    Open(OpenArgs),
+}
+
+#[derive(Args)]
+struct InitArgs {
+    /// Course prefix and number
+    name: String,
+
+    /// Course title
+    title: String,
+
+    /// Professor's name
+    prof: String,
+
+    /// Semester id for grouping courses
+    semester: String,
+}
+
+#[derive(Args)]
+struct OpenArgs {
+    /// Course prefix and number
+    name: Option<String>,
+}
+
+#[derive(Deserialize, Serialize)]
+struct Config {
+    root: PathBuf,
+    template: PathBuf,
+}
+
+#[derive(Deserialize, Serialize)]
+struct Course {
+    name: String,
+    title: String,
+    prof: String,
+    semester: String,
+}
+
+#[derive(Serialize)]
+struct CourseContext<'a> {
+    name: &'a String,
+    title: &'a String,
+    prof: &'a String,
+    semester: &'a String,
+    notebook: String,
+}
+
+impl<'a> CourseContext<'a> {
+    fn from(course: &'a Course, config: &'a Config) -> CourseContext<'a> {
+        let notebook = config.root.to_str()
+            .unwrap().to_owned();
+
+        CourseContext {
+            name: &course.name,
+            title: &course.title,
+            prof: &course.prof,
+            semester: &course.semester,
+            notebook,
+        }
+    }
+}
+
+fn resolve_home(path: &mut PathBuf) {
+    if path.starts_with("~") {
+        let temp = path.strip_prefix("~").unwrap();
+        *path = dirs::home_dir().expect("Could not resolve home directory.")
+            .join(temp);
+    }
+}
+
+fn create_config(path: &PathBuf) -> Config {
+    let mut root: PathBuf;
+    let mut input = String::new();
+
+    print!("Where should lecture notes go? ");
+    io::stdout().flush().unwrap();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("Failed to read user input.");
+
+    root = PathBuf::from(input.trim());
+    resolve_home(&mut root);
+
+    let template = path.join("lecture_template.tex");
+    let config = Config { root, template };
+
+    let toml = toml::to_string(&config)
+        .expect("Unable to convert config struct to toml string.");
+    fs::write(path.join("config.toml"), toml)
+        .expect("Unable to initialize config.");
+
+    return config;
+}
+
+fn read_config(path: &PathBuf) -> Config {
+    let file_path = path.join("config.toml");
+
+    if !file_path.try_exists().unwrap() {
+        return create_config(&path);
+    }
+    
+    let file = fs::read_to_string(file_path)
+        .expect("Error reading config file.");
+    return toml::from_str(&file)
+        .expect("Error parsing config file.");
+}
+
+fn get_courses(path: &PathBuf) -> HashMap<String, Course> {
+    let file_path = path.join("courses.toml");
+    let file = fs::read_to_string(file_path)
+        .unwrap_or(String::new());
+
+    return toml::from_str(&file).unwrap();
+}
+
+fn save_courses(courses: &HashMap<String, Course>, path: &PathBuf) {
+    let toml = toml::to_string(courses)
+        .expect("Unable to convert courses to toml string.");
+    fs::write(path.join("courses.toml"), toml)
+        .expect("Unable save courses information.");
+}
+
+fn pick_course<'a>(courses: &'a HashMap<String, Course>) -> Result<&'a Course, &'static str> {
+    let mut options = String::new();
+    let courses_seq: Vec<&Course> = courses.values().collect();
+    for course in &courses_seq {
+        options.push_str(&course.name.to_uppercase());
+        options.push_str(": ");
+        options.push_str(&course.title);
+        options.push_str("\n");
+    }
+
+    let course_idx = rofi_picker("Courses", options)?;
+
+    return Ok(&courses_seq[course_idx as usize]);
+}
+
+fn rofi_picker(title: &'static str, input: String) -> Result<u32, &'static str> {
+    let mut rofi = Command::new("rofi")
+        .args(["-dmenu", "-i"])
+        .args(["-p", title])
+        .args(["-format", "i"])
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .spawn().map_err(|_| "Rofi failed to launch.")?;
+
+    rofi.stdin.as_mut().unwrap().write(input.as_bytes())
+        .map_err(|_| "Could not send input to Rofi process.")?;
+
+    let rofi_output = rofi.wait_with_output()
+        .map_err(|_| "Waiting on Rofi failed.")?;
+    let choice = String::from_utf8(rofi_output.stdout)
+        .map_err(|_| "Couldn't make sense of Rofi output.")?;
+
+    if choice.trim().is_empty() { return Err("Rofi was quit without a choice."); }
+
+    let choice_idx = choice.trim().parse::<u32>().unwrap();
+
+    return Ok(choice_idx);
+}
+
+fn launch_tex(directory: &PathBuf, file_name: &String) {
+    let mut xoppdog = Command::new("xoppdog")
+        .arg("sit")
+        .arg(directory.join("figures").as_os_str())
+        .stdout(io::stdout())
+        .stderr(io::stderr())
+        .spawn()
+        .expect("Failed to start xoppdog.");
+
+    let mut wezterm = Command::new("wezterm")
+        .args(["start", "--always-new-process", "--cwd"])
+        .arg(directory.as_os_str())
+        .args(["nvim", file_name])
+        .spawn()
+        .expect("Failed to start neovim terminal.");
+
+    wezterm.wait().expect("Where did the terminal go??");
+    xoppdog.kill().expect("Couldn't kill xoppdog.");
+}
+
+fn init_command(args: InitArgs, config: &Config) -> Course {
+    let course = Course {
+        name: args.name,
+        title: args.title,
+        prof: args.prof, 
+        semester: args.semester
+    };
+
+    let lecture_directory = config.root.join(&course.semester).join(&course.name)
+        .join("lecture");
+    fs::create_dir_all(&lecture_directory)
+        .expect("Failed creating course dir.");
+
+    return course;
+}
+
+fn open_command(args: OpenArgs, courses: &HashMap<String, Course>, config: &Config) -> Result<(), &'static str> {
+    let course = match &args.name {
+        Some(name) => courses.get(name).expect("Course not found."),
+        None => pick_course(courses)?,
+    };
+
+    let in_lecture = rofi_picker("Type", String::from("Lecture\nHomework"))? == 0;
+    let new_file = rofi_picker("Action", String::from("New\nEdit"))? == 0;
+    
+    let course_directory = config.root.join(&course.semester).join(&course.name).join("lecture");
+    let file_name = match (in_lecture, new_file) {
+        (true, true) => new_lesson(&course, &config),
+        (_, _) => String::from("main.tex"),
+    };
+    
+    launch_tex(&course_directory, &file_name);
+
+    Ok(())
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    let config_path = dirs::config_dir()
+        .expect("Could not resolve config directory.")
+        .join("lectern");
+
+    if !config_path.try_exists().unwrap() {
+        fs::create_dir_all(&config_path).unwrap();
+    }
+
+    let config = read_config(&config_path);
+    let mut courses = get_courses(&config_path);
+
+    match cli.command {
+        Commands::Init(args) => {
+            let course = init_command(args, &config);
+            let name = course.name.clone();
+            courses.insert(name, course);
+            save_courses(&courses, &config_path);
+        },
+        Commands::Open(args) => open_command(args, &courses, &config).unwrap(),
+
+    };
+}