feat: add shell completions

Auto-generated with clap.

build.rs

@@ -0,0 +1,53 @@
+// Importing from Ironbar modules brings in lots of things not used by the build script
+// we can just globally suppress those.
+#![allow(unused, dead_code)]
+
+#[path = "src/cli.rs"]
+mod cli;
+
+#[path = "src/error.rs"]
+mod error;
+
+#[path = "src/ipc"]
+mod ipc {
+    #[path = "commands.rs"]
+    mod commands;
+
+    #[path = "responses.rs"]
+    mod responses;
+
+    pub use commands::Command;
+    pub use responses::Response;
+}
+
+use clap::Command;
+use clap::CommandFactory;
+use clap_complete::generate_to;
+use clap_complete::Shell::{Bash, Fish, Zsh};
+use cli::Args;
+use std::fs;
+use std::path::PathBuf;
+
+const NAME: &str = "ironbar";
+
+fn generate_shell_completions(mut cmd: Command) -> std::io::Result<()> {
+    const MANIFEST_DIR: &str = env!("CARGO_MANIFEST_DIR");
+    let comp_dir = PathBuf::from(MANIFEST_DIR).join("target/completions");
+
+    fs::create_dir_all(&comp_dir)?;
+
+    for shell in [Bash, Fish, Zsh] {
+        generate_to(shell, &mut cmd, NAME, &comp_dir)?;
+    }
+
+    Ok(())
+}
+
+fn main() -> std::io::Result<()> {
+    let mut cmd = Args::command();
+    cmd.set_bin_name(NAME);
+
+    generate_shell_completions(cmd)?;
+
+    Ok(())
+}