generate completions

Cargo.lock

@@ -168,6 +168,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "clap_generate"
+version = "3.0.0-beta.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adf420f8b687b628d2915ccfd43a660c437a170432e3fbcb66944e8717a0d68f"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "concurrent-queue"
 version = "1.2.2"
@@ -443,6 +452,7 @@ dependencies = [
  "async-io",
  "async-net",
  "clap",
+ "clap_generate",
  "crossbeam-queue",
  "crossterm 0.19.0",
  "dirs-next",

Cargo.toml

@@ -29,6 +29,10 @@ version = "0.14.0"
 default-features = false
 features = ["crossterm", "serde"]
 
+[build-dependencies]
+clap = "3.0.0-beta.2"
+clap_generate = "3.0.0-beta.2"
+
 [profile.release]
 lto = true
 panic = "abort"

build.rs

@@ -0,0 +1,20 @@
+use clap::IntoApp;
+use clap_generate::{generate_to, generators};
+
+use std::{env, fs::create_dir_all, path::Path};
+
+include!("src/cli.rs");
+
+fn main() {
+    let out = &Path::new(&env::var_os("OUT_DIR").unwrap()).join("completions");
+    create_dir_all(out).unwrap();
+    let app = &mut Opts::into_app();
+
+    macro_rules! generate {
+        ($($g:ident),*) => {
+            $(generate_to::<generators::$g, _, _>(app, "mmtc", out);)*
+        }
+    }
+
+    generate![Bash, Elvish, Fish, PowerShell, Zsh];
+}