Add CLI command for generating OpenAPI documentation

apps/api/src/cmd.rs

@@ -0,0 +1,45 @@
+use std::pin::Pin;
+use std::{future::Future, process::exit};
+
+use clap::{ArgMatches, Command};
+
+pub mod generate_openapi;
+
+pub struct CliCommand {
+    pub command: Command,
+    pub action: fn(&clap::ArgMatches) -> Pin<Box<dyn std::future::Future<Output = ()> + Send>>,
+}
+
+static CLI_COMMANDS: once_cell::sync::Lazy<
+    [CliCommand; 1 /* Update this count when adding new commands */],
+> =
+    once_cell::sync::Lazy::new(|| {
+        [
+            // Add new commands here
+            generate_openapi::get_cli_command(),
+        ]
+    });
+
+pub fn get_command() -> Command {
+    let mut c = Command::new("cmd");
+
+    for cmd in CLI_COMMANDS.iter() {
+        c = c.subcommand(cmd.command.clone());
+    }
+
+    c
+}
+
+pub fn execute(matches: &ArgMatches, help_msg: &str) -> Pin<Box<dyn Future<Output = ()> + Send>> {
+    if let Some((subcommand_name, subcommand_matches)) = matches.subcommand() {
+        for cmd in CLI_COMMANDS.iter() {
+            if cmd.command.get_name() == subcommand_name {
+                return (cmd.action)(subcommand_matches);
+            }
+        }
+    }
+
+    eprintln!("Error: No valid subcommand provided.");
+    eprintln!("{}", help_msg);
+    exit(1);
+}