Set up initial structure for the nix builder.

src/cli/mod.rs

@@ -0,0 +1 @@
+pub(crate) mod parameters;

src/cli/parameters.rs

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+use clap::Args;
+use clap::Parser;
+use clap::Subcommand;
+use std::path::PathBuf;
+
+#[derive(Parser, Debug)]
+#[command(name = "nix_builder")]
+#[command(version = env!("CARGO_PKG_VERSION"))]
+#[command(about = "Build nix packages.", long_about = None)]
+#[command(propagate_version = true)]
+pub(crate) struct Cli {
+    #[command(subcommand)]
+    pub(crate) command: Commands,
+}
+
+#[derive(Subcommand, Debug)]
+pub(crate) enum Commands {
+    /// Run a single build.
+    Build(BuildArgs),
+
+    /// Launch a daemon to run builds.
+    Daemon(DaemonArgs),
+}
+
+#[derive(Args, Debug)]
+pub(crate) struct BuildArgs {
+    /// Path to the nix_builder config file.
+    #[arg(short, long)]
+    pub(crate) config: PathBuf,
+
+    /// The target to build.
+    #[arg(short, long)]
+    pub(crate) target: Vec<String>,
+}
+
+#[derive(Args, Debug)]
+pub(crate) struct DaemonArgs {
+    /// Path to the nix_builder config file.
+    #[arg(short, long)]
+    pub(crate) path: PathBuf,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        Cli::command().debug_assert()
+    }
+}