feat: add build time completion generation

Cargo.lock

@@ -188,6 +188,15 @@ dependencies = [
  "strsim",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "4.5.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c757a3b7e39161a4e56f9365141ada2a6c915a8622c408ab6bb4b5d047371031"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "clap_derive"
 version = "4.5.55"
@@ -1533,6 +1542,7 @@ dependencies = [
  "anyhow",
  "chrono",
  "clap",
+ "clap_complete",
  "colored",
  "dirs",
  "serde",

Cargo.toml

@@ -13,3 +13,10 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 sqlx = { version = "0.8", features = ["runtime-tokio", "sqlite", "chrono", "migrate"] }
 tokio = { version = "1", features = ["rt", "macros"] }
+
+[build-dependencies]
+anyhow = "1"
+chrono = { version = "0.4", features = ["serde"] }
+clap = { version = "4", features = ["derive"] }
+clap_complete = "4"
+serde = { version = "1", features = ["derive"] }

build.rs

@@ -0,0 +1,28 @@
+#[allow(dead_code)]
+#[path = "src/model.rs"]
+mod model;
+
+include!("src/cli.rs");
+
+use clap::{CommandFactory, ValueEnum};
+use clap_complete::{generate_to, Shell};
+use std::{env, io::Error};
+
+fn main() -> Result<(), Error> {
+    let outdir = env::var_os("SHELL_COMPLETIONS_DIR")
+        .or_else(|| env::var_os("OUT_DIR"));
+
+    let Some(outdir) = outdir else {
+        return Ok(());
+    };
+
+    let mut cmd = Cli::command();
+
+    for shell in Shell::value_variants() {
+        let path = generate_to(*shell, &mut cmd, "todo", &outdir)?;
+
+        println!("cargo:warning=completion file is generated: {path:?}");
+    }
+
+    Ok(())
+}