fix: patch-hub crashes when loading patches after b4 fails

src/app.rs

@@ -3,7 +3,7 @@ use crate::{
     ui::popup::{info_popup::InfoPopUp, PopUp},
 };
 use ansi_to_tui::IntoText;
-use color_eyre::eyre::bail;
+use color_eyre::eyre::{bail};
 use config::Config;
 use cover_renderer::render_cover;
 use logging::Logger;
@@ -23,6 +23,8 @@ use screens::{
     CurrentScreen,
 };
 use std::collections::{HashMap, HashSet};
+use std::ffi::OsStr;
+use std::path::Path;
 
 use crate::utils;
 
@@ -32,6 +34,11 @@ pub mod logging;
 pub mod patch_renderer;
 pub mod screens;
 
+pub enum PatchFound {
+    Found,
+    NotFound
+} 
+
 /// Type that represents the overall state of the application. It can be viewed
 /// as the **Model** component of `patch-hub`.
 pub struct App {
@@ -132,7 +139,7 @@ impl App {
     /// Initializes field [App::details_actions], from currently selected
     /// patchset in [App::bookmarked_patchsets] or [App::latest_patchsets],
     /// depending on the value of [App::current_screen].
-    pub fn init_details_actions(&mut self) -> color_eyre::Result<()> {
+    pub fn init_details_actions(&mut self) -> color_eyre::Result<PatchFound> {
         let representative_patch: Patch;
         let mut is_patchset_bookmarked = true;
         let mut reviewed_by = Vec::new();
@@ -164,7 +171,15 @@ impl App {
             self.config.patchsets_cache_dir(),
             &representative_patch,
         )) {
-            Ok(result) => result,
+            Ok(result) => {
+				let path = Path::new(OsStr::new(&result));
+
+				if ! path.exists() {
+					return Ok(PatchFound::NotFound);
+				}
+
+				result
+			} 
             Err(io_error) => bail!("{io_error}"),
         };
 
@@ -250,7 +265,7 @@ impl App {
                     lore_api_client: self.lore_api_client.clone(),
                     patchset_path,
                 });
-                Ok(())
+                Ok(PatchFound::Found)
             }
             Err(message) => bail!(message),
         }

src/handler/latest.rs

@@ -1,10 +1,11 @@
 use std::ops::ControlFlow;
 
 use crate::{
-    app::{screens::CurrentScreen, App},
+    app::{screens::CurrentScreen, App, PatchFound},
     loading_screen,
-    ui::popup::{help::HelpPopUpBuilder, PopUp},
+    ui::popup::{help::HelpPopUpBuilder, info_popup::InfoPopUp, PopUp},
 };
+use color_eyre::eyre::Ok;
 use ratatui::{
     crossterm::event::{KeyCode, KeyEvent},
     prelude::Backend,
@@ -55,10 +56,19 @@ where
                 "Loading patchset" => {
                     let result = app.init_details_actions();
                     if result.is_ok() {
-                        app.set_current_screen(CurrentScreen::PatchsetDetails);
+                        match result.unwrap() {
+                            PatchFound::Found => {
+                                app.set_current_screen(CurrentScreen::PatchsetDetails);
+                            }
+
+                            PatchFound::NotFound => {
+                                app.popup = Some(InfoPopUp::generate_info_popup("Error","The selected patchset couldn't be retrieved.\nPlease choose another patchset."));
+						        app.set_current_screen(CurrentScreen::LatestPatchsets);
+                            }
+                        }   
                     }
-                    result
-                }
+                    Ok(())
+				}
             };
         }
         _ => {}