Rewrite upcheck in Rust.

Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "upcheck"
+version = "0.1.0"
+authors = ["Eduard Toloza <tolosaeduard@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+notify-rust = "^3"

src/main.rs

@@ -0,0 +1,56 @@
+// Crate for notifications
+extern crate notify_rust;
+
+use notify_rust::Notification;
+use std::path::Path;
+use std::process::Command;
+
+fn main() {
+    upcheck();
+}
+
+fn upcheck() {
+    // Declare variables
+    let checkupdates = "/usr/bin/checkupdates";
+
+    // check if pacman-contrib and libnotify are installed
+    if Path::new(&checkupdates).exists() {
+        // Get output of checkupdates command
+        let available_updates = Command::new(&checkupdates)
+            .output()
+            .expect("Failed to execute the checkupdates command.");
+
+        // if the previous command exit with sucess, continue.
+        if available_updates.status.success() {
+            // Convert the output of the command into a string.
+            let available_updates = String::from_utf8(available_updates.stdout)
+                .expect("Output of checkupdates could not be parsed as valid UTF-8.");
+            // Send the notification if updates are or not available
+            if &available_updates.len() > &0 {
+                Notification::new()
+                    .summary("The following updates are available:")
+                    .body(&available_updates)
+                    .icon("dialog-information")
+                    .show()
+                    .unwrap();
+            } else {
+                Notification::new()
+                    .summary("No updates are available.")
+                    .icon("dialog-information")
+                    .show()
+                    .unwrap();
+            }
+        } else {
+            eprintln!("Process exited with: {}", available_updates.status);
+            eprintln!(
+                "\nMore information about the error:\n\n {:#?}",
+                available_updates
+            );
+        }
+    } else {
+        eprintln!(
+            "File {} doesn't exist, please install the pacman-contrib package.",
+            &checkupdates
+        );
+    }
+}