feat: support --help and --version CLI arguments

src/cli/mod.rs

@@ -0,0 +1,40 @@
+use crate::utils::formatted_strings::APP_VERSION;
+
+/// Parse CLI arguments, and exit if `--help`, `--version`, or an
+/// unknown argument was supplied
+pub fn parse_cli_args() {
+    let args = std::env::args().skip(1);
+    for arg in args {
+        match arg.as_str() {
+            "--help" | "-h" => print_help(),
+            "--version" | "-v" => print_version(),
+            _ => {
+                unknown_argument(&arg);
+                std::process::exit(1);
+            }
+        }
+        std::process::exit(0);
+    }
+}
+
+fn print_help() {
+    println!(
+        "Application to comfortably monitor your Internet traffic\n\
+        Usage: sniffnet [OPTIONS]\n\
+        Options:\n\
+        \t-h, --help      Print help\n\
+        \t-v, --version   Print version info\n\
+        (Run without options to start the app)"
+    );
+}
+
+fn print_version() {
+    println!("sniffnet {APP_VERSION}");
+}
+
+fn unknown_argument(arg: &str) {
+    eprintln!(
+        "sniffnet: unknown option '{arg}'\n\
+        For more information, try 'sniffnet --help'"
+    );
+}

src/main.rs

@@ -10,6 +10,7 @@ use iced::{window, Application, Settings};
 
 use chart::types::chart_type::ChartType;
 use chart::types::traffic_chart::TrafficChart;
+use cli::parse_cli_args;
 use configs::types::config_device::ConfigDevice;
 use configs::types::config_settings::ConfigSettings;
 use gui::pages::types::running_page::RunningPage;
@@ -32,6 +33,7 @@ use utils::formatted_strings::print_cli_welcome_message;
 use crate::secondary_threads::check_updates::set_newer_release_status;
 
 mod chart;
+mod cli;
 mod configs;
 mod countries;
 mod gui;
@@ -46,6 +48,8 @@ mod utils;
 ///
 /// It initializes shared variables and loads configuration parameters
 pub fn main() -> iced::Result {
+    parse_cli_args();
+
     let current_capture_id1 = Arc::new(Mutex::new(0));
     let current_capture_id2 = current_capture_id1.clone();
 

src/networking/types/data_info.rs

@@ -1,8 +1,9 @@
 //! Module defining the `DataInfo` struct, which represents incoming and outgoing packets and bytes.
 
-use crate::networking::types::traffic_direction::TrafficDirection;
 use std::ops::AddAssign;
 
+use crate::networking::types::traffic_direction::TrafficDirection;
+
 /// Amount of exchanged data (packets and bytes) incoming and outgoing
 #[derive(Clone, Default, Copy)]
 pub struct DataInfo {