prevented crash on empty anime list selection

Suggestions about refactoring

.gitignore

@@ -1 +1,2 @@
 /target
+test.json

Cargo.lock

@@ -629,6 +629,7 @@ dependencies = [
  "crossterm 0.24.0",
  "dirs",
  "isahc",
+ "lazy_static",
  "regex",
  "rust_cast",
  "serde_json",

Cargo.toml

@@ -20,3 +20,4 @@ crossterm = "0.24.0"
 unicode-width = "0.1.9"
 rust_cast = "0.17.0"
 viuer = { version = "0.6", features = ["sixel"] }
+lazy_static = "1.4.0"

src/anime/scraper.rs

@@ -3,43 +3,39 @@ use isahc::{ReadResponseExt, Request, RequestExt};
 use std::fs::File;
 use std::io::prelude::*;
 
+use crate::helpers::{fixing_text::htmlise, scraper};
+
 //use serde_json::json;
 
 pub fn search_anime(query: String) -> (Vec<String>, Vec<String>, Vec<String>) {
     let req = Request::builder()
         .uri(format!(
             "https://api.consumet.org/meta/anilist/{}",
-            query
-                .replace(" ", "%20")
-                .replace(":", "%3A")
-                .replace("!", "%21")
-                .replace("?", "%3F")
-                .replace("'", "%27")
+            htmlise(query)
         ))
         .redirect_policy(isahc::config::RedirectPolicy::Follow)
-        .header(
-            "user-agent",
-            "Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/100.0",
-        )
+        .header("user-agent", *scraper::USER_AGENT)
         .body(())
         .unwrap();
     let json = req.send().unwrap().text().unwrap();
     let json: serde_json::Value = serde_json::from_str(&json).unwrap();
+
     let mut titles = Vec::new();
     let mut ids = Vec::new();
     let mut images = Vec::new();
-    for i in 0..json["results"].as_array().unwrap().len() {
+
+    for anime in json["results"].as_array().unwrap().iter() {
         titles.push(
-            json["results"][i]["title"]["userPreferred"]
+            anime["title"]["userPreferred"]
                 .as_str()
                 .unwrap()
                 .to_string(),
         );
 
-        ids.push(json["results"][i]["id"].as_str().unwrap().to_string());
-        //convert ids to i32
-        images.push(json["results"][i]["image"].as_str().unwrap().to_string());
+        ids.push(anime["id"].as_str().unwrap().to_string());
+        images.push(anime["image"].as_str().unwrap().to_string());
     }
+
     (ids, titles, images)
 }
 
@@ -50,19 +46,18 @@ pub fn get_episodes(id: &i32, provider: &str) -> (Vec<String>, Vec<String>) {
             id, provider
         ))
         .redirect_policy(isahc::config::RedirectPolicy::Follow)
-        .header(
-            "user-agent",
-            "Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/100.0",
-        )
+        .header("user-agent", *scraper::USER_AGENT)
         .body(())
         .unwrap();
     let json = req.send().unwrap().text().unwrap();
     let json: serde_json::Value = serde_json::from_str(&json).unwrap();
+
     let mut titles = Vec::new();
     let mut ids = Vec::new();
-    for i in 0..json["episodes"].as_array().unwrap().len() {
-        titles.push(json["episodes"][i]["title"].as_str().unwrap().to_string());
-        ids.push(json["episodes"][i]["id"].as_str().unwrap().to_string());
+
+    for episode in json["episodes"].as_array().unwrap().iter() {
+        titles.push(episode["title"].as_str().unwrap().to_string());
+        ids.push(episode["id"].as_str().unwrap().to_string());
     }
     (titles, ids)
 }
@@ -74,33 +69,31 @@ pub fn get_episode_link(ep_id: &str, provider: &str) -> (String, String) {
             ep_id, provider
         ))
         .redirect_policy(isahc::config::RedirectPolicy::Follow)
-        .header(
-            "user-agent",
-            "Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/100.0",
-        )
+        .header("user-agent", *scraper::USER_AGENT)
         .body(())
         .unwrap();
     let json = req.send().unwrap().text().unwrap();
     let json: serde_json::Value = serde_json::from_str(&json).unwrap();
+
     let mut url = String::new();
     std::fs::write("test.json", json.to_string()).unwrap();
+
     let mut subtitle = String::new();
     let _error_vec = Vec::new();
+
     let sub_array = json["subtitles"].as_array().unwrap_or(&_error_vec);
-    for i in 0..sub_array.len() {
+
+    for sub in sub_array.iter() {
         //set subtitle to lang = English
-        if json["subtitles"][i]["lang"].as_str().unwrap_or("null") == "English" {
-            subtitle = json["subtitles"][i]["url"]
-                .as_str()
-                .unwrap_or("null")
-                .to_string();
+        if sub["lang"].as_str().unwrap_or("null") == "English" {
+            subtitle = sub["url"].as_str().unwrap_or("null").to_string();
             // add \ before the first : in the url
             subtitle = subtitle.replace(":", "\\:");
         }
     }
     let mut highest_quality = 0;
-    for i in 0..json["sources"].as_array().unwrap().len() {
-        let quality = json["sources"][i]["quality"]
+    for source in json["sources"].as_array().unwrap().iter() {
+        let quality = source["quality"]
             .as_str()
             .unwrap()
             .replace("p", "")
@@ -108,10 +101,10 @@ pub fn get_episode_link(ep_id: &str, provider: &str) -> (String, String) {
             .unwrap_or(0);
         if quality > highest_quality {
             highest_quality = quality;
-            url = json["sources"][i]["url"].as_str().unwrap().to_string();
+            url = source["url"].as_str().unwrap().to_string();
         }
     }
-    (url.to_string(), subtitle)
+    (url, subtitle)
 }
 
 pub fn get_image(url: &str, path: &str) {

src/helpers/fixing_text.rs

@@ -59,3 +59,12 @@ pub fn fix_html_encoding(ln_text: &Vec<String>) -> Vec<String> {
     }
     ln_text_new
 }
+
+pub fn htmlise(query: String) -> String {
+    query
+        .replace(" ", "%20")
+        .replace(":", "%3A")
+        .replace("!", "%21")
+        .replace("?", "%3F")
+        .replace("'", "%27")
+}

src/helpers/mod.rs

@@ -1,2 +1,3 @@
 pub mod fixing_text;
+pub mod scraper;
 pub mod take_input;

src/helpers/scraper.rs

@@ -0,0 +1,4 @@
+lazy_static! {
+    pub static ref USER_AGENT: &'static str =
+        "Mozilla/5.0 (X11; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/100.0";
+}

src/main.rs

@@ -3,6 +3,9 @@ mod helpers;
 mod ln;
 mod ui;
 
+#[macro_use]
+extern crate lazy_static;
+
 use anime::anime::anime_ui;
 use colored::Colorize;
 //use ln::ui::ln_ui;
@@ -11,6 +14,7 @@ use ln::ln::ln_ui;
 use crate::anime::trackers::*;
 use crate::get_token;
 use crate::helpers::take_input::{int_input, string_input};
+
 fn main() {
     let mut help = false;
     let mut anime = false;
@@ -106,25 +110,19 @@ fn main() {
 }
 
 fn print_help() {
-    println!("anime:\t\t{}", format_args!("{}", "-a --anime".red()));
+    println!("anime:\t\t{}\n", format_args!("{}", "-a --anime".red()));
     //print blank line
-    println!("");
     println!(
-        "cast:\t\t{}",
+        "cast:\t\t{}\n",
         format_args!("{} {}", "-C --cast".red(), "<IP Adress>".green())
     );
-    println!("");
-    println!("light novel:\t{}", format_args!("{}", "-l --ln".red()));
-    //print blank line
-    println!("");
-    println!("chapter:\t{}", format_args!("{}", "-c --chapter".red()));
+    println!("light novel:\t{}\n", format_args!("{}", "-l --ln".red()));
+    println!("chapter:\t{}\n", format_args!("{}", "-c --chapter".red()));
     println!(
         "{}",
         "after this^^^ argument you can enter a chapter number".green()
     );
-    println!("{}", "for exaple kami -c 200");
-    //print blank line
-    println!("");
+    println!("{}", "for exaple kami -c 200\n");
     println!("provider:\t{}", format_args!("{}", "-r --provider".red()));
     println!(
         "{}",
@@ -138,8 +136,11 @@ fn print_help() {
         "if the -r argument is not used it will default to {}",
         "zoro".green()
     );
-    println!("the providers are {} or {}", "gogo".green(), "zoro".green());
-    println!("");
+    println!(
+        "the providers are {} or {}\n",
+        "gogo".green(),
+        "zoro".green()
+    );
     println!("reader:\t\t{}", format_args!("{}", "-R --reader".red()));
     println!(
         "{}",
@@ -153,8 +154,7 @@ fn print_help() {
         "if the -R argument is not used it will default to {}",
         "bat".green()
     );
-    println!("the readers are {} or {}", "bat".green(), "glow".green());
-    println!("");
+    println!("the readers are {} or {}\n", "bat".green(), "glow".green());
     println!("help:\t\t{}", format_args!("{}", "-h --help".red()));
     //kill the program
     std::process::exit(0);

src/ui/app/anime.rs

@@ -103,6 +103,24 @@ impl<'a> KamiApp for App {
             terminal.draw(|f| self.ui(f))?;
 
             if let Event::Key(key) = event::read()? {
+                fn match_anime_list(this: &mut App, selected: Option<usize>) {
+                    match selected {
+                        Some(0) => match this.animes.2.len() {
+                            0 => {
+                                _ = 0;
+                            }
+                            _ => {
+                                this.image = this.animes.2[selected.unwrap()].clone();
+                                this.change_image();
+                            }
+                        },
+                        Some(std::usize::MAX) => _ = 0,
+                        _ => {
+                            this.image = this.animes.2[selected.unwrap()].clone();
+                            this.change_image();
+                        }
+                    }
+                }
                 match self.input_mode {
                     InputMode::Normal => match key.code {
                         KeyCode::Char('i') => {
@@ -120,8 +138,7 @@ impl<'a> KamiApp for App {
                             false => {
                                 self.messages.next();
                                 let selected = self.messages.state.selected();
-                                self.image = self.animes.2[selected.unwrap()].clone();
-                                self.change_image();
+                                match_anime_list(self, selected);
                             }
                         },
                         KeyCode::Char('j') => match ep_select {
@@ -131,8 +148,7 @@ impl<'a> KamiApp for App {
                             false => {
                                 self.messages.next();
                                 let selected = self.messages.state.selected();
-                                self.image = self.animes.2[selected.unwrap()].clone();
-                                self.change_image();
+                                match_anime_list(self, selected)
                             }
                         },
                         KeyCode::Up => match ep_select {
@@ -142,8 +158,7 @@ impl<'a> KamiApp for App {
                             false => {
                                 self.messages.previous();
                                 let selected = self.messages.state.selected();
-                                self.image = self.animes.2[selected.unwrap()].clone();
-                                self.change_image();
+                                match_anime_list(self, selected)
                             }
                         },
                         KeyCode::Char('k') => match ep_select {
@@ -153,8 +168,7 @@ impl<'a> KamiApp for App {
                             false => {
                                 self.messages.previous();
                                 let selected = self.messages.state.selected();
-                                self.image = self.animes.2[selected.unwrap()].clone();
-                                self.change_image();
+                                match_anime_list(self, selected)
                             }
                         },
                         //if KeyCode::Enter => {