feat: argument parsing and version cli flag

Cargo.lock

@@ -23,6 +23,38 @@ version = "1.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 
+[[package]]
+name = "argh"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34ff18325c8a36b82f992e533ece1ec9f9a9db446bd1c14d4f936bac88fcd240"
+dependencies = [
+ "argh_derive",
+ "argh_shared",
+ "rust-fuzzy-search",
+]
+
+[[package]]
+name = "argh_derive"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb7b2b83a50d329d5d8ccc620f5c7064028828538bdf5646acd60dc1f767803"
+dependencies = [
+ "argh_shared",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.114",
+]
+
+[[package]]
+name = "argh_shared"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a464143cc82dedcdc3928737445362466b7674b5db4e2eb8e869846d6d84f4f6"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "atomic"
 version = "0.6.1"
@@ -118,6 +150,7 @@ name = "chkr"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "argh",
  "crossterm",
  "insta",
  "ratatui",
@@ -990,6 +1023,12 @@ version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
 
+[[package]]
+name = "rust-fuzzy-search"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a157657054ffe556d8858504af8a672a054a6e0bd9e8ee531059100c0fa11bb2"
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2024"
 crossterm = "0.29"
 ratatui = { version = "0.30", features = ["crossterm"] }
 anyhow = "1.0"
+argh = "0.1.13"
 
 [dev-dependencies]
 insta = "1.33"

src/main.rs

@@ -16,8 +16,24 @@ use ratatui::backend::CrosstermBackend;
 use std::io::{self, Read as _};
 use terminal_guard::TerminalModeGuard;
 use todo_list::TodoList;
+use argh::FromArgs;
+
+#[derive(FromArgs)]
+/// chkr - terminal checklist
+struct Args {
+    /// print version and exit
+    #[argh(switch, short = 'V', long = "version")]
+    version: bool,
+}
 
 fn main() -> Result<()> {
+    let args: Args = argh::from_env();
+
+    if args.version {
+        println!("v{}", env!("CARGO_PKG_VERSION"));
+        return Ok(());
+    }
+
     let mut input = String::new();
     io::stdin()
         .read_to_string(&mut input)