Clean up/fix error handling in main

src/main.rs

@@ -1,64 +1,43 @@
 mod app;
+mod crossterm;
 mod literature;
 mod ui;
 
+use clap::Parser;
 use log::error;
 use serde_json;
+use std::{env, error::Error, fs::OpenOptions};
 
 use crate::app::AppState;
 
-// use crate::snowballing::get_citing_papers;
-// #[tokio::main]
-// async fn main() -> Result<(), reqwest::Error> {
-//     let publications = get_citing_papers("w2963127785", "an.tsouchlos@gmail.com").await?;
-//
-//     let app = App {
-//         pending_publications: publications,
-//         ..Default::default()
-//     };
-//
-//     if let Ok(serialized) = serde_json::to_string_pretty(&app) {
-//         std::fs::write("temp.json", serialized)
-//             .expect("We can't really deal with io errors ourselves");
-//     }
-//
-//     Ok(())
-// }
+fn deserialize_savefile(filename: &String) -> Result<AppState, Box<dyn Error>> {
+    if !std::fs::exists(filename)? {
+        return Ok(AppState::default());
+    }
 
-fn deserialize_savefile(
-    filename: &String,
-) -> Result<AppState, serde_json::Error> {
-    match std::fs::read_to_string(filename) {
-        Ok(content) => {
-            let app: AppState = serde_json::from_str(&content)?;
-            Ok(app)
-        }
-        Err(_) => {
-            let app = AppState::default();
-            if let Ok(serialized) = serde_json::to_string_pretty(&app) {
-                let _ = std::fs::write(filename, serialized);
-            }
-            Ok(app)
-        }
-    }
+    let app_state: AppState =
+        serde_json::from_str::<AppState>(&std::fs::read_to_string(filename)?)?;
+
+    Ok(app_state)
 }
 
 fn serialize_savefile(
     app: &AppState,
     filename: &String,
-) -> Result<(), serde_json::Error> {
-    if let Ok(serialized) = serde_json::to_string_pretty(&app) {
-        std::fs::write(filename, serialized)
-            .expect("We can't really deal with io errors ourselves");
+) -> Result<(), Box<dyn Error>> {
+    let serialized = serde_json::to_string_pretty(&app)?;
+    Ok(std::fs::write(filename, serialized)?)
 }
 
+async fn run(args: &Args) -> Result<(), Box<dyn Error>> {
+    let starting_app_state = deserialize_savefile(&args.savefile)?;
+    let final_app_state = crate::crossterm::run(starting_app_state).await?;
+
+    serialize_savefile(&final_app_state, &args.savefile)?;
+
     Ok(())
 }
 
-use clap::Parser;
-mod crossterm;
-use std::{env, error::Error, fs::OpenOptions};
-
 #[derive(Parser)]
 #[command(name = "Brittling")]
 #[command(about = "A tool to perform snowballing for literature studies", long_about = None)]
@@ -89,21 +68,9 @@ async fn main() {
         )))
         .init();
 
-    match run(&args).await {
-        Err(e) => {
+    if let Err(e) = run(&args).await {
         error!("Application error: {}", e);
         print!("{e:?}");
         std::process::exit(1);
     }
-        _ => {}
-    }
-}
-
-async fn run(args: &Args) -> Result<(), Box<dyn Error>> {
-    let starting_app_state = deserialize_savefile(&args.savefile)?;
-    let final_app_state = crate::crossterm::run(starting_app_state).await?;
-
-    serialize_savefile(&final_app_state, &args.savefile)?;
-
-    Ok(())
 }