diff --git a/Cargo.toml b/Cargo.toml
index d2b9d31..45b5c9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,9 @@ edition = "2021"
 [dependencies]
 directories = "5.0.1"
 eframe = "0.21.3"
+native-dialog = "0.6.3"
 rfd = "0.11.4"
 serde = "1.0.163"
 serde_derive = "1.0.163"
+shell-escape = "0.1.5"
 toml = "0.7.4"
diff --git a/src/infos.rs b/src/infos.rs
index 253553b..42d6a84 100644
--- a/src/infos.rs
+++ b/src/infos.rs
@@ -55,4 +55,14 @@ impl Difficulty {
         ];
         DIFFICULTIES.iter()
     }
+    pub fn flag_number(&self) -> &str {
+        match self {
+            Difficulty::None => "0",
+            Difficulty::Baby => "1",
+            Difficulty::Easy => "2",
+            Difficulty::Medium => "3",
+            Difficulty::Hard => "4",
+            Difficulty::Nightmare => "5",
+        }
+    }           
 }
diff --git a/src/main.rs b/src/main.rs
index 0bdab7c..4e4079e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 use config::{default_save_filename, load_config, save_config, Config};
 use eframe::egui;
 use infos::{Difficulty, LauncherInfo, WadInfo};
+use native_dialog::{MessageDialog, MessageType};
 use std::path::PathBuf;
 use std::process::Command;
 
@@ -32,6 +33,13 @@ struct RustDoomLauncher {
     difficulty: Difficulty,
     fast_monsters: bool,
     respawning_monsters: bool,
+    display_command: bool,
+}
+
+// Great name, I know
+enum MyErrors {
+    NoLauncher,
+    NoIwad,
 }
 
 impl Default for RustDoomLauncher {
@@ -50,6 +58,7 @@ impl Default for RustDoomLauncher {
             difficulty: Difficulty::None,
             fast_monsters: false,
             respawning_monsters: false,
+            display_command: false,
         }
     }
 }
@@ -76,14 +85,34 @@ impl RustDoomLauncher {
         }
     }
 
-    fn launch_doom(&self) -> () {
+    fn get_launcher_and_command(&self, show_dialogs: bool) -> Result<(&str, Vec<&str>), MyErrors> {
         let launcher = match self.selected_launcher {
             Some(l) => self.all_launchers.get(l).unwrap(),
-            None => panic!("Gotta pick a launcher!"),
+            None => {
+                if show_dialogs {
+                    MessageDialog::new()
+                        .set_type(MessageType::Error)
+                        .set_title("I can't let you do that")
+                        .set_text("You didn't pick a launcher!\nPlease do that")
+                        .show_alert()
+                        .unwrap();
+                }
+                return Err(MyErrors::NoLauncher);
+            }
         };
         let iwad = match self.selected_iwad {
             Some(i) => self.all_iwads.get(i).unwrap(),
-            None => panic!("Gotta pick and iwad"),
+            None => {
+                if show_dialogs {
+                    MessageDialog::new()
+                        .set_type(MessageType::Error)
+                        .set_title("I can't let you do that")
+                        .set_text("You didn't pick an IWAD!\nPlease do that")
+                        .show_alert()
+                        .unwrap();
+                }
+                return Err(MyErrors::NoIwad);
+            }
         };
         let mut command = vec!["-iwad", iwad.path.to_str().unwrap()];
         for pwad_index in &self.selected_pwads {
@@ -91,9 +120,37 @@ impl RustDoomLauncher {
             let pwad = self.all_pwads.get(*pwad_index).unwrap();
             command.push(pwad.path.to_str().unwrap());
         }
-        Command::new(launcher.path.to_str().unwrap())
-            .args(command)
-            .spawn();
+        if self.difficulty != Difficulty::None {
+            command.push("-skill");
+            command.push(self.difficulty.flag_number());
+        }
+        if !self.warp_string.is_empty() {
+            command.push("-warp");
+            command.push(&self.warp_string);
+        }
+        if self.respawning_monsters {
+            command.push("-respawn");
+        }
+        Ok((launcher.path.to_str().unwrap(), command))
+    }
+
+    fn form_command_string(&self) -> String {
+        match self.get_launcher_and_command(false) {
+            Ok((launch, comms)) => {
+                //TODO - escape all the strings
+                let c = comms.join(" ");
+                format!("{} {}", launch, c)
+            }
+            Err(MyErrors::NoLauncher) => "Error: No launcher".to_string(),
+            Err(MyErrors::NoIwad) => "Error: No IWAD".to_string(),
+        }
+    }
+
+    fn launch_doom(&self) -> () {
+        if let Ok((launcher, command)) = self.get_launcher_and_command(true) {
+            // Note to self, don't hit launch button when running from emacs
+            Command::new(launcher).args(command).spawn();
+        }
     }
 }
 
@@ -108,7 +165,7 @@ impl eframe::App for RustDoomLauncher {
         true
     }
 
-    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+    fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
         if self.config_file_loaded == false {
             self.get_config_file_stuff();
             self.config_file_loaded = true;
@@ -247,7 +304,10 @@ impl eframe::App for RustDoomLauncher {
                 });
             });
             ui.separator();
-            ui.label("Command");
+            ui.horizontal(|ui| {
+                ui.label("Command");
+                ui.checkbox(&mut self.display_command, "");
+            });
             ui.horizontal_wrapped(|ui| {
                 // I don't actually think using SelectableLabel is correct here -
                 //  but it'll at least do the highlighting when hovered nicely
@@ -300,6 +360,13 @@ impl eframe::App for RustDoomLauncher {
                     pos += 1;
                 }
             });
+            if self.display_command {
+                ui.horizontal(|ui| {
+                    let mut text = self.form_command_string();
+                    let window_size = frame.info().window_info.size;
+                    ui.add(egui::TextEdit::multiline(&mut text).desired_width(window_size[0] * 0.9));
+                });
+            }
         });
     }
 }