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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f2c9127
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "happens"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.3.1", features = ["derive"] }
+copypasta = "0.8.2"
+phf = { version = "0.11.1", features = ["macros"] }
+xdotool = "0.0.2"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6c4a1e3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,5 @@
+
+### `happens`
+
+A keyboard layout switcher. Just highlight the text and press a preconfigured
+hotkey to switch the layout.
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2074a21
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,60 @@
+mod tables;
+#[cfg(test)]
+mod tests;
+
+use clap::Parser;
+use copypasta::x11_clipboard::{Primary, X11ClipboardContext};
+use copypasta::{ClipboardContext, ClipboardProvider};
+use std::thread;
+use std::time::Duration;
+use tables::{ENG_TO_RU, RU_TO_ENG};
+use xdotool::keyboard::send_key;
+use xdotool::option_vec;
+use xdotool::OptionVec;
+
+// TODO: consider switching away from xdotool system dependency (currently
+//       the program won't work if xdotool is not installed)
+
+// TODO: implement saving removed selection to some kind of storage so that
+//       it can be restored via another hotkey
+
+// TODO: add error logging
+
+#[derive(Parser, Debug)]
+struct Args {
+    #[arg(short, long)]
+    table: String,
+}
+
+fn main() {
+    let args = Args::parse();
+    // I don't know why yet, but without this delay program invocation
+    // via OS hotkey binding isn't working from time to time
+    thread::sleep(Duration::from_millis(50));
+    let user_selection = X11ClipboardContext::<Primary>::new()
+        .expect("Failed to initialize X11 connection.")
+        .get_contents()
+        .expect("Failed to read user selection.");
+    let mut clipboard = ClipboardContext::new().unwrap();
+    let substitute = get_substitute(user_selection, args.table);
+    clipboard.set_contents(substitute).unwrap();
+    send_key("ctrl+v", option_vec![]);
+}
+
+fn get_substitute(user_input: String, table_name: String) -> String {
+    user_input
+        .chars()
+        .map(|c| {
+            let sub = match table_name.as_str() {
+                "eng-to-ru" => ENG_TO_RU.get(&c.to_string()),
+                "ru-to-eng" => RU_TO_ENG.get(&c.to_string()),
+                _ => panic!("Unknown table name: {}", table_name),
+            };
+            match sub {
+                Some(s) => s.to_string(),
+                None => c.to_string(),
+            }
+        })
+        .collect::<Vec<String>>()
+        .join("")
+}
diff --git a/src/tables.rs b/src/tables.rs
new file mode 100644
index 0000000..1752f90
--- /dev/null
+++ b/src/tables.rs
@@ -0,0 +1,143 @@
+use phf::{phf_map};
+
+pub static ENG_TO_RU: phf::Map<&'static str, &'static str> = phf_map! {
+    "q" => "й",
+    "Q" => "Й",
+    "w" => "ц",
+    "W" => "Ц",
+    "e" => "у",
+    "E" => "У",
+    "r" => "к",
+    "R" => "К",
+    "t" => "е",
+    "T" => "Е",
+    "y" => "н",
+    "Y" => "Н",
+    "u" => "г",
+    "U" => "Г",
+    "i" => "ш",
+    "I" => "Ш",
+    "o" => "щ",
+    "O" => "Щ",
+    "p" => "з",
+    "P" => "З",
+    "[" => "х",
+    "{" => "Х",
+    "]" => "ъ",
+    "}" => "Ъ",
+    "\\" => "\\",
+    "|" => "/",
+    "a" => "ф",
+    "A" => "Ф",
+    "s" => "ы",
+    "S" => "Ы",
+    "d" => "в",
+    "D" => "В",
+    "f" => "а",
+    "F" => "А",
+    "g" => "п",
+    "G" => "П",
+    "h" => "р",
+    "H" => "Р",
+    "j" => "о",
+    "J" => "О",
+    "k" => "л",
+    "K" => "Л",
+    "l" => "д",
+    "L" => "Д",
+    ";" => "ж",
+    ":" => "Ж",
+    "'" => "э",
+    "\"" => "Э",
+    "z" => "я",
+    "Z" => "Я",
+    "x" => "ч",
+    "X" => "Ч",
+    "c" => "с",
+    "C" => "С",
+    "v" => "м",
+    "V" => "М",
+    "b" => "и",
+    "B" => "И",
+    "n" => "т",
+    "N" => "Т",
+    "m" => "ь",
+    "M" => "Ь",
+    "," => "б",
+    "<" => "Б",
+    "." => "ю",
+    ">" => "Ю",
+    "/" => ".",
+    "?" => ",",
+};
+
+pub static RU_TO_ENG : phf::Map<&'static str, &'static str> = phf_map! {
+    "й" => "q",
+    "Й" => "Q",
+    "ц" => "w",
+    "Ц" => "W",
+    "у" => "e",
+    "У" => "E",
+    "к" => "r",
+    "К" => "R",
+    "е" => "t",
+    "Е" => "T",
+    "н" => "y",
+    "Н" => "Y",
+    "г" => "u",
+    "Г" => "U",
+    "ш" => "i",
+    "Ш" => "I",
+    "щ" => "o",
+    "Щ" => "O",
+    "з" => "p",
+    "З" => "P",
+    "х" => "[",
+    "Х" => "{",
+    "ъ" => "]",
+    "Ъ" => "}",
+    "\\" => "\\",
+    "/" => "|",
+    "ф" => "a",
+    "Ф" => "A",
+    "ы" => "s",
+    "Ы" => "S",
+    "в" => "d",
+    "В" => "D",
+    "а" => "f",
+    "А" => "F",
+    "п" => "g",
+    "П" => "G",
+    "р" => "h",
+    "Р" => "H",
+    "о" => "j",
+    "О" => "J",
+    "л" => "k",
+    "Л" => "K",
+    "д" => "l",
+    "Д" => "L",
+    "ж" => ";",
+    "Ж" => ":",
+    "э" => "'",
+    "Э" => "\"",
+    "я" => "z",
+    "Я" => "Z",
+    "ч" => "x",
+    "Ч" => "X",
+    "с" => "c",
+    "С" => "C",
+    "м" => "v",
+    "М" => "V",
+    "и" => "b",
+    "И" => "B",
+    "т" => "n",
+    "Т" => "N",
+    "ь" => "m",
+    "Ь" => "M",
+    "б" => ",",
+    "Б" => "<",
+    "ю" => ".",
+    "Ю" => ">",
+    "." => "/",
+    "," => "?",
+};
diff --git a/src/tests.rs b/src/tests.rs
new file mode 100644
index 0000000..7de3f24
--- /dev/null
+++ b/src/tests.rs
@@ -0,0 +1,30 @@
+use crate::*;
+
+#[test]
+fn test_get_substitute_eng_to_ru() {
+    let user_input = "qwerty".to_string();
+    let table_name = "eng_to_ru".to_string();
+    assert_eq!(get_substitute(user_input, table_name), "йцукен".to_string());
+}
+
+#[test]
+fn test_get_substitute_ru_to_eng() {
+    let user_input = "йцукен".to_string();
+    let table_name = "ru_to_eng".to_string();
+    assert_eq!(get_substitute(user_input, table_name), "qwerty".to_string());
+}
+
+#[test]
+fn test_get_substitute_mixed() {
+    let user_input = "qweЙЦУ".to_string();
+    let table_name = "eng_to_ru".to_string();
+    assert_eq!(get_substitute(user_input, table_name), "йцуЙЦУ".to_string());
+}
+
+#[test]
+#[should_panic(expected = "Unknown table name: unknown")]
+fn test_get_substitute_unknown_table() {
+    let user_input = "qwerty".to_string();
+    let table_name = "unknown".to_string();
+    get_substitute(user_input, table_name);
+}