feat: compile time completion generation

Removed `completion` command in favor of compile time completion
generation. This tool will only be build from source for the foreseeable
future so this makes sense for now.

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 license = "MIT"
 authors = ["Matej Janežič <janezic.mj@gmail.com>"]
 repository = "https://github.com/janezicmatej/ahab.git"
+build = "build.rs"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -15,3 +16,7 @@ clap = { version = "4.3.0", features = ["derive"] }
 clap_complete = "4.3.0"
 anyhow = "1.0.71"
 dotenvy = "0.15.7"
+
+[build-dependencies]
+clap = { version = "4.3.0", features = ["derive"] }
+clap_complete = "4.3.0"

build.rs

@@ -0,0 +1,22 @@
+use clap::{CommandFactory, ValueEnum};
+use clap_complete::{generate_to, Shell};
+use std::{env, io::Error};
+
+include!("src/cli/mod.rs");
+
+fn main() -> Result<(), Error> {
+    let outdir = match env::var_os("OUT_DIR") {
+        None => return Ok(()),
+        Some(outdir) => outdir,
+    };
+
+    let mut cmd = ahab::Ahab::command();
+
+    for shell in Shell::value_variants() {
+        let path = generate_to(*shell, &mut cmd, "ahab", &outdir)?;
+
+        println!("cargo:warning=completion file is generated: {path:?}");
+    }
+
+    Ok(())
+}

src/cli/ahab.rs

@@ -1,6 +1,5 @@
 use super::{Django, Docker, DockerCompose, Postgres};
 use clap::{Parser, Subcommand};
-use clap_complete::Shell;
 
 /// A program for interacting with various dockerized applications.
 #[derive(Parser, Debug)]
@@ -12,12 +11,6 @@ pub struct Ahab {
 
 #[derive(Debug, Subcommand)]
 pub enum Commands {
-    /// Generate completion files
-    Completion {
-        #[arg(value_enum)]
-        shell: Shell,
-    },
-
     /// Docker related subcommands
     Docker {
         #[command(subcommand)]

src/main.rs

@@ -1,7 +1,7 @@
 use ahab::{cli, scripts};
 
 use anyhow::Result;
-use clap::{CommandFactory, Parser};
+use clap::Parser;
 
 fn main() -> Result<()> {
     // always load dotenv on start
@@ -13,15 +13,6 @@ fn main() -> Result<()> {
     let args = cli::Ahab::parse();
 
     match args.command {
-        cli::Commands::Completion { shell } => {
-            clap_complete::generate(
-                shell,
-                &mut cli::Ahab::command(),
-                "ahab",
-                &mut std::io::stdout(),
-            );
-            Ok(())
-        }
         cli::Commands::Docker { command } => match command {
             cli::Docker::StopAll => scripts::docker::stop_all(),
         },