First dispatcher

- Create (sub)command structure.
- First experimental dispatcher to start the daemon.

src/cli/cli_args.rs

@@ -0,0 +1,107 @@
+use clap::Parser;
+use clap::Subcommand;
+
+#[derive(Parser, Debug)]
+#[clap(
+    name = "Husk milter",
+    about = "Encrypting milter.",
+    arg_required_else_help = true,
+)]
+pub struct CliArgs {
+    #[clap(
+        long, short,
+        help = "Configuration file.",
+    )]
+    pub config: Option<String>,
+
+    #[clap(subcommand)]
+    pub subcommand: HuskSubcommands,
+}
+
+// Subcommands Level 1
+
+#[derive(Debug, Subcommand)]
+pub enum HuskSubcommands {
+    Daemon(DaemonCommand),
+    Introducer(IntroducerCommand),
+    Local,
+}
+
+// Daemon subcommands
+
+#[derive(Parser, Debug)]
+#[clap(
+    name = "daemon",
+    about = "Manage milter daemon.",
+    subcommand_required = true,
+    arg_required_else_help = true,
+    disable_colored_help = true,
+    disable_version_flag = true,
+)]
+pub struct DaemonCommand {
+    #[clap(subcommand)]
+    pub subcommand: DaemonSubcommand,
+}
+#[derive(Debug, Subcommand)]
+pub enum DaemonSubcommand {
+    Start,
+    Stop,
+    Status
+}
+
+// Introducer subcommands
+
+#[derive(Parser, Debug)]
+#[clap(
+    name = "introducer",
+    about = "Manage introducers.",
+    subcommand_required = true,
+    arg_required_else_help = true,
+    disable_colored_help = true,
+    disable_version_flag = true,
+)]
+pub struct IntroducerCommand {
+    #[clap(subcommand)]
+    pub subcommand: IntroducerSubcommands,
+}
+#[derive(Debug, Subcommand)]
+pub enum IntroducerSubcommands {
+    Add(IntroducerAddCommand),
+    Remove(IntroducerRemoveCommand),
+    List
+}
+
+#[derive(Parser, Debug)]
+#[clap(
+    name = "introducer",
+    about = "Add introducers.",
+)]
+pub struct IntroducerAddCommand {
+    #[clap(
+        long = "cert",
+        help = "Certificate to declare as introducer."
+    )]
+    pub cert: String,
+
+    #[clap(
+        long = "domains",
+        help = "Domains this certificate introduces.",
+        required = true,
+        num_args = 1..,
+        value_delimiter = ' '
+    )]
+   pub domains: Vec<String>,
+}
+
+#[derive(Parser, Debug)]
+#[clap(
+    name = "introducer",
+    about = "Remove introducers.",
+)]
+pub struct IntroducerRemoveCommand {
+    #[clap(
+        long = "cert",
+        help = "Certificate to be removed as introducer."
+    )]
+    pub cert: String,
+}