Add prechecks

src/check.rs

@@ -0,0 +1,40 @@
+// This functions are used to check if the required dependencies are satisfied
+// before starting espanso
+
+#[cfg(target_os = "linux")]
+pub fn check_dependencies() -> bool {
+    use std::process::Command;
+
+    let mut result = true;
+
+    // Make sure notify-send is installed
+    let status = Command::new("notify-send")
+        .arg("-v")
+        .output();
+    if let Err(_) = status {
+        println!("Error: 'notify-send' command is needed for espanso to work correctly, please install it.");
+        result = false;
+    }
+
+    // Make sure xclip is installed
+    let status = Command::new("xclip")
+        .arg("-version")
+        .output();
+    if let Err(_) = status {
+        println!("Error: 'xclip' command is needed for espanso to work correctly, please install it.");
+        result = false;
+    }
+
+    result
+}
+
+#[cfg(target_os = "macos")]
+pub fn check_dependencies() -> bool {
+    // TODO: check accessibility
+}
+
+#[cfg(target_os = "windows")]
+pub fn check_dependencies() -> bool {
+    // Nothing needed on windows
+    true
+}

src/clipboard/linux.rs

@@ -1,5 +1,6 @@
 use std::process::{Command, Stdio};
 use std::io::{Write};
+use log::error;
 
 pub struct LinuxClipboardManager {}
 
@@ -31,8 +32,8 @@ impl super::ClipboardManager for LinuxClipboardManager {
             if let Some(output) = stdin {
                 let res = output.write_all(payload.as_bytes());
 
-                if let Err(_) = res {
+                if let Err(e) = res {
-                    // TODO: log error
+                    error!("Could not set clipboard: {}", e);
                 }
             }
         }
@@ -41,8 +42,6 @@ impl super::ClipboardManager for LinuxClipboardManager {
 
 impl LinuxClipboardManager {
     pub fn new() -> LinuxClipboardManager {
-        // TODO: check if xclip is present and log an error otherwise.
-
         LinuxClipboardManager{}
     }
 }

src/main.rs

@@ -27,6 +27,7 @@ use std::io::{BufReader, BufRead};
 
 mod ui;
 mod event;
+mod check;
 mod bridge;
 mod engine;
 mod config;
@@ -154,6 +155,9 @@ fn main() {
         restart_main(config_set);
         return;
     }
+
+    // Defaults to start subcommand
+    start_main(config_set);
 }
 
 /// Daemon subcommand, start the event loop and spawn a background thread worker
@@ -165,6 +169,8 @@ fn daemon_main(config_set: ConfigSet) {
         exit(3);
     }
 
+    precheck_guard();
+
     // Initialize log
     let log_level = match config_set.default.log_level {
         0 => LevelFilter::Warn,
@@ -261,6 +267,8 @@ fn start_main(config_set: ConfigSet) {
     }
     release_lock(lock_file.unwrap());
 
+    precheck_guard();
+
     if cfg!(target_os = "windows") {
         // TODO: start windows detached
     }else{
@@ -469,3 +477,13 @@ fn acquire_lock() -> Option<File> {
 fn release_lock(lock_file: File) {
     lock_file.unlock().unwrap()
 }
+
+/// Used to make sure all the required dependencies are present before starting espanso.
+fn precheck_guard() {
+    let satisfied = check::check_dependencies();
+    if !satisfied {
+        println!();
+        println!("Pre-check was not successful, espanso could not be started.");
+        exit(5);
+    }
+}