feat: fabric server jar download feature during init

src/main.rs

@@ -1,7 +1,8 @@
 mod models;
 mod utils;
 
-use crate::{models::vanilla::{VanillaVersionDetail, VanillaVersionType, VanillaVersions}, utils::{with_progressbar, with_spinner}};
+use crate::{models::{vanilla::{VanillaVersionDetail, VanillaVersionType, VanillaVersions}}, utils::{with_progressbar, with_spinner}};
+use crate::models::fabric::FabricVersions;
 use clap::{
     Parser, Subcommand,
     builder::styling::{self},
@@ -9,7 +10,7 @@ use clap::{
 use dialoguer::{FuzzySelect, Select, theme::ColorfulTheme};
 use futures_util::StreamExt;
 use sha1::{Digest, Sha1};
-use std::error::Error;
+use std::{error::Error, fmt::format};
 use tokio::io::AsyncWriteExt;
 
 fn styles() -> styling::Styles {
@@ -113,7 +114,68 @@ async fn main() -> Result<(), Box<dyn Error>> {
                         Ok(())
                     }).await?;
                 }
-                1 => {}
+                1 => {
+                    const URL: &str = "https://meta.fabricmc.net/v2/versions";
+                    let res = with_spinner("", "", || async {
+                        let res: FabricVersions = reqwest::get(URL).await?.json().await?;
+                        Ok(res)
+                    }).await?;
+
+                    let game_version_names = res.game
+                        .iter()
+                        .filter(|game| game.stable)
+                        .map(|game| game.version.clone())
+                        .collect::<Vec<_>>();
+
+                    let game_version_index = FuzzySelect::with_theme(&ColorfulTheme::default())
+                        .with_prompt("Select Game Version")
+                        .items(&game_version_names)
+                        .default(0)
+                        .interact()?;
+
+                    let loader_version_names = res.loader
+                        .iter()
+                        .filter(|loader| loader.stable)
+                        .map(|loader| loader.version.clone())
+                        .collect::<Vec<_>>();
+
+                    let loader_version_index = FuzzySelect::with_theme(&ColorfulTheme::default())
+                        .with_prompt("Select Loader Version")
+                        .items(&loader_version_names)
+                        .default(0)
+                        .interact()?;
+
+                    let game_version = game_version_names[game_version_index].clone();
+                    let loader_version = loader_version_names[loader_version_index].clone();
+                    let installer_version = res.installer
+                        .iter()
+                        .find_map(|installer| {
+                            if installer.stable { Some(installer.version.clone()) }
+                            else { None }
+                        }).ok_or("No Installer Version Found")?;
+
+                    let start_msg = format!(
+                        "downloading server.jar for {} {}, {}",
+                        loaders[loader_index], loader_version_names[loader_version_index],
+                        game_version_names[game_version_index],
+                    );
+                    with_spinner(&start_msg, "download finished", || async {
+                        let download_url = format!(
+                            "{}/loader/{}/{}/{}/server/jar",
+                            URL, game_version, loader_version, installer_version
+                        );
+                        let res = reqwest::get(download_url).await?;
+                        let mut file = tokio::fs::File::create("server.jar").await?;
+                        let mut stream = res.bytes_stream();
+
+                        while let Some(chunk) = stream.next().await {
+                            file.write_all(&chunk?).await?;
+                        }
+
+                        Ok(())
+                    }).await?;
+
+                }
                 _ => return Err("Invalid selection".into()),
             }
         }

src/models/fabric.rs

@@ -0,0 +1,26 @@
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+pub struct FabricVersions {
+    pub game: Vec<FabricGameVersion>,
+    pub loader: Vec<FabricLoaderVersion>,
+    pub installer: Vec<FabricInstallerVersion>,
+}
+
+#[derive(Deserialize)]
+pub struct FabricGameVersion {
+    pub version: String,
+    pub stable: bool,
+}
+
+#[derive(Deserialize)]
+pub struct FabricLoaderVersion {
+    pub version: String,
+    pub stable: bool,
+}
+
+#[derive(Deserialize)]
+pub struct FabricInstallerVersion {
+    pub version: String,
+    pub stable: bool,
+}

src/models/mod.rs

@@ -1 +1,2 @@
 pub mod vanilla;
+pub mod fabric;