Can show command line help

src/main.rs

@@ -1,16 +1,35 @@
-use std::future::Future;
-
 use comunic_server::{cleanup_thread, server};
 use comunic_server::data::config::{conf, Config};
 use comunic_server::helpers::database;
+use comunic_server::utils::date_utils::current_year;
 
-type MainActionFunction = Box<dyn Future<Output=std::io::Result<()>>>;
+type MainActionFunction = std::io::Result<()>;
 
 struct Action {
     name: String,
     description: String,
     arguments: Vec<String>,
-    function: Box<dyn FnOnce() -> MainActionFunction>,
+    function: Box<dyn Fn() -> MainActionFunction>,
+}
+
+fn get_actions() -> Vec<Action> {
+    vec![
+        // Start server
+        Action {
+            name: "serve".to_string(),
+            description: "Start the Comunic Server (default action)".to_string(),
+            arguments: vec![],
+            function: Box::new(serve),
+        },
+
+        // Show help
+        Action {
+            name: "help".to_string(),
+            description: "Show this help".to_string(),
+            arguments: vec![],
+            function: Box::new(help),
+        }
+    ]
 }
 
 #[actix_rt::main]
@@ -34,36 +53,28 @@ async fn main() -> std::io::Result<()> {
         .unwrap_or("serve")
         .to_string();
 
-    /* let actions = vec![
-         Action {
-             name: "serve".to_string(),
-             description: "Start the Comunic Server (default action)".to_string(),
-             arguments: vec![],
-             function: Box::new(serve),
-         }
-     ];
+    let actions = get_actions();
 
-     let selected_action = actions
-         .iter()
-         .filter(|p|p.name.eq(&action))
-         .next();
+    let selected_action = actions
+        .iter()
+        .filter(|p| p.name.eq(&action))
+        .next();
 
-     let selected_action = match selected_action {
-         None => {
-             eprintln!("Action {} invalid! For more information try 'help'!", action);
-             std::process::exit(-1);
-         }
-         Some(a) => a
-     };
+    let selected_action = match selected_action {
+        None => {
+            eprintln!("Action {} invalid! For more information try 'help'!", action);
+            std::process::exit(-1);
+        }
+        Some(a) => a
+    };
 
-     if selected_action.arguments.len() != args.len() - 2 {
-         eprintln!("Invalid number of arguments!");
-         std::process::exit(-2);
-     }
+    if !selected_action.arguments.is_empty() && selected_action.arguments.len() + 2 > args.len() {
+        eprintln!("Invalid number of arguments!");
+        std::process::exit(-2);
+    }
 
-     let func =  (selected_action.function)();
-     func.await*/
-    serve()
+    (selected_action.function)()?;
+    Ok(())
 }
 
 /// Start Comunic Server (main action)
@@ -86,5 +97,20 @@ fn serve() -> std::io::Result<()> {
     });
 
     t.join().unwrap();
+    Ok(())
+}
+
+fn help() -> std::io::Result<()> {
+    println!("Comunic API v3 Server - (c) Pierre HUBERT 2012 - {}", current_year());
+
+    println!("Available actions:");
+    for action in get_actions() {
+        println!("\t{}\t{} - {}",
+                 action.name,
+                 action.arguments.iter().map(|s| format!("[{}]", s)).collect::<Vec<String>>().join(" "),
+                 action.description
+        );
+    }
+
     Ok(())
 }

src/utils/date_utils.rs

@@ -4,7 +4,7 @@
 
 use std::time::{SystemTime, UNIX_EPOCH};
 
-use chrono::{TimeZone, Utc};
+use chrono::{TimeZone, Utc, Datelike};
 
 /// Get the current time since epoch
 ///
@@ -34,4 +34,10 @@ pub fn time_to_mysql_date(time: u64) -> String {
 /// Get current Mysql formatted date
 pub fn mysql_date() -> String {
     time_to_mysql_date(time())
+}
+
+/// Get current year
+pub fn current_year() -> i32 {
+    let utc = Utc.timestamp(time() as i64, 0);
+    utc.year()
 }