10 files changed, 350 insertions, 90 deletions

diff --git a/src/apis/modrinth.rs b/src/apis/modrinth.rs
index 3af5bbd..0c3eca5 100644
--- a/src/apis/modrinth.rs
+++ b/src/apis/modrinth.rs
@@ -1,6 +1,6 @@
 use serde::Deserialize;
 
-use crate::Modloader;
+use crate::{Modloader, List};
 
 #[derive(Debug, Deserialize)]
 pub struct Project {
@@ -68,7 +68,7 @@ pub enum Status {
     unknown
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct Version {
     pub name: String,
     pub version_number: String,
@@ -86,14 +86,14 @@ pub struct Version {
 }
 
 #[allow(non_camel_case_types)]
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub enum VersionType {
     release,
     beta,
     alpha
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct VersionFile {
     pub hashes: Hash,
     pub url: String,
@@ -102,7 +102,7 @@ pub struct VersionFile {
     pub size: u32,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct Hash {
     pub sha512: String,
     pub sha1: String,
@@ -130,7 +130,7 @@ pub async fn project(api: String, name: &str) -> Project {
     serde_json::from_slice(&data.await.unwrap()).unwrap()
 }
 
-pub async fn projects(api: String, ids: Vec<&str>) -> Vec<Project> {
+pub async fn projects(api: String, ids: Vec<String>) -> Vec<Project> {
     let all = ids.join(r#"",""#);
     let url = format!(r#"projects?ids=["{}"]"#, all);
     println!("{}", url);
@@ -140,14 +140,14 @@ pub async fn projects(api: String, ids: Vec<&str>) -> Vec<Project> {
     serde_json::from_slice(&data.await.unwrap()).unwrap()
 }
 
-pub async fn versions(api: String, id: String, loader: Modloader, mc_version: String) -> Vec<Version> {
+pub async fn versions(api: String, id: String, list: List) -> Vec<Version> {
 
-    let loaderstr = match loader {
+    let loaderstr = match list.modloader {
         Modloader::Forge => String::from("forge"),
         Modloader::Fabric => String::from("fabric"),
     };
 
-    let url = format!(r#"project/{}/version?loaders=["{}"]&game_versions=["{}"]"#, id, loaderstr, mc_version);
+    let url = format!(r#"project/{}/version?loaders=["{}"]&game_versions=["{}"]"#, id, loaderstr, list.mc_version);
 
     let data = get(api, url);
 
diff --git a/src/commands/add.rs b/src/commands/add.rs
deleted file mode 100644
index ed4a6d8..0000000
--- a/src/commands/add.rs
+++ /dev/null
@@ -1,52 +0,0 @@
-use std::io::{Error, ErrorKind};
-
-use crate::{modrinth::{project, versions}, config::Cfg, db::insert_mod, Modloader, input::Input};
-
-pub async fn modification(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
-    
-    if args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))) }
-
-    let arguments = Input::from(args.unwrap().join(" "))?;
-
-    if arguments.args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
-
-    match arguments.command.as_str() {
-        "add" => {
-            add(config, arguments.args.unwrap()).await
-        },
-        _ => Err(Box::new(Error::new(ErrorKind::InvalidInput, "UNKNOWN_SUBCOMMAND")))
-    }
-}
-
-pub async fn add(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
-    
-    if args.len() < 1 { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
-
-    let project = project(String::from(&config.apis.modrinth), &args[0]).await;
- 
-    dbg!(&project);
-
-    let loader = Modloader::Fabric;
-
-    if project.versions.is_empty() { panic!("This should never happen"); };
-
-    let current_version = get_current(config, String::from(&project.id)).await?;
-    
-    //add to current list and mod table
-    match insert_mod(project.id, project.title, current_version, project.versions, loader, String::from("1.19.2")) {
-        Err(err) => { Err(Box::new(err)) },
-        Ok(()) => Ok(()),
-    }
-
-}
-
-async fn get_current(config: Cfg, id: String) -> Result<String, Box<dyn std::error::Error>> {
-    let available_versions = versions(config.apis.modrinth, id, Modloader::Fabric, String::from("1.19.2")).await;
-
-    match available_versions.len() {
-        0 => Err(Box::new(Error::new(ErrorKind::NotFound, "NO_VERSIONS_AVAILABLE"))),
-        //TODO compare publish dates
-        1.. => Ok(available_versions[0].id.to_string()),
-        _ => panic!("available_versions should never be negative"),
-    }
-}
diff --git a/src/commands/list.rs b/src/commands/list.rs
index 6c260ce..3dfe1ad 100644
--- a/src/commands/list.rs
+++ b/src/commands/list.rs
@@ -1,12 +1,19 @@
 use std::io::{Error, ErrorKind};
 
-use crate::{db::{insert_list, remove_list, change_list, get_lists, get_current_list}, Modloader, config::Cfg, input::Input};
+use crate::{db::{insert_list, remove_list, change_list, get_lists, get_current_list_id, get_list}, Modloader, config::Cfg, input::Input};
+
+#[derive(Clone)]
+pub struct List {
+    pub id: String,
+    pub mc_version: String,
+    pub modloader: Modloader,
+}
 
 pub fn list(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
 
     if args.is_none() {
         let lists = get_lists(config.clone())?;
-        let current_list = get_current_list(config)?;
+        let current_list = get_current_list_id(config)?;
         println!("Your lists:\n{}\n-----\nCurrently selected list: \"{}\"", lists.join(",\n"), current_list);
         return Ok(());
     }
@@ -29,6 +36,11 @@ pub fn list(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::e
     }
 }
 
+pub fn get_current_list(config: Cfg) -> Result<List, Box<dyn std::error::Error>> {
+    let id = get_current_list_id(config.clone())?;
+    get_list(config, id)
+}
+
 fn add(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
     match args.len() {
         1 | 2 => Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))),
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 6432746..5d008fd 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -1,5 +1,7 @@
-pub mod add;
+pub mod modification;
 pub mod list;
+pub mod update;
 
-pub use add::*;
+pub use modification::*;
 pub use list::*;
+pub use update::*;
diff --git a/src/commands/modification.rs b/src/commands/modification.rs
new file mode 100644
index 0000000..43e2180
--- /dev/null
+++ b/src/commands/modification.rs
@@ -0,0 +1,88 @@
+use std::io::{Error, ErrorKind};
+
+use crate::{modrinth::{project, versions, Version}, config::Cfg, db::{insert_mod, remove_mod_from_list, get_mod_id, insert_mod_in_list, get_mods, get_mods_from_list}, input::Input, get_current_list};
+
+pub async fn modification(config: Cfg, args: Option<Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
+    
+    if args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))) }
+
+    let arguments = Input::from(args.unwrap().join(" "))?;
+
+    if arguments.args.is_none() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+
+    match arguments.command.as_str() {
+        "add" => {
+            add(config, arguments.args.unwrap()).await
+        },
+        "remove" => {
+            remove(config, arguments.args.unwrap())
+        },
+        _ => Err(Box::new(Error::new(ErrorKind::InvalidInput, "UNKNOWN_SUBCOMMAND")))
+    }
+}
+
+async fn add(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+    
+    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+    
+    let current_list = get_current_list(config.clone())?;
+
+    let project = project(String::from(&config.apis.modrinth), &args[0]).await;
+
+    dbg!(&project);
+
+    if project.versions.is_empty() { panic!("This should never happen"); };
+
+    let available_versions = versions(String::from(&config.apis.modrinth), String::from(&project.id), current_list.clone()).await;
+
+    let current_version = extract_current_version(available_versions.clone())?;
+    
+    //add to current list and mod table
+    match get_mods_from_list(config.clone(), current_list.clone()) {
+        Ok(mods) => {
+            dbg!(&mods);
+            if mods.contains(&project.id) {
+                return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_ON_LIST"))); } 
+            else {
+                insert_mod_in_list(config.clone(), current_list.clone(), String::from(&project.id), current_version, available_versions)?;
+            } 
+        },
+        Err(..) => insert_mod_in_list(config.clone(), current_list, String::from(&project.id), current_version, available_versions)?,
+    };
+    
+    match get_mods(config.clone()) {
+        Ok(mods) => {
+            dbg!(&mods);
+            if mods.contains(&project.id) {
+                return Err(Box::new(Error::new(ErrorKind::Other, "MOD_ALREADY_IN_DATABASE")))
+            } else {
+                insert_mod(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?;
+            } 
+        },
+        Err(..) => insert_mod(config.clone(), String::from(&project.id), String::from(&project.title), project.versions)?,
+    };
+
+    Ok(())
+}
+
+fn remove(config: Cfg, args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
+    if args.is_empty() { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))); };
+
+    let current_list = get_current_list(config.clone())?;
+    let mod_id = get_mod_id(config.clone(), String::from(&args[0]))?;
+    
+    //TODO implement remove from modlist if not in any other lists && config clean is true
+    match remove_mod_from_list(config, current_list, mod_id) {
+        Err(err) => { Err(Box::new(err)) },
+        Ok(()) => Ok(()),
+    }
+}
+
+fn extract_current_version(versions: Vec<Version>) -> Result<String, Box<dyn std::error::Error>> {
+    match versions.len() {
+        0 => Err(Box::new(Error::new(ErrorKind::NotFound, "NO_VERSIONS_AVAILABLE"))),
+        //TODO compare publish dates
+        1.. => Ok(versions[0].id.to_string()),
+        _ => panic!("available_versions should never be negative"),
+    }
+}
diff --git a/src/commands/update.rs b/src/commands/update.rs
new file mode 100644
index 0000000..14c37ec
--- /dev/null
+++ b/src/commands/update.rs
@@ -0,0 +1,40 @@
+use std::io::{Error, ErrorKind};
+
+use crate::{config::Cfg, modrinth::projects, get_current_list, db::{get_mods_from_list, get_versions}};
+
+pub async fn update(config: Cfg) -> Result<(), Box<dyn std::error::Error>> {
+
+    let current_list = get_current_list(config.clone())?;
+
+    let mods = get_mods_from_list(config.clone(), current_list)?;
+
+    let mut projects = projects(String::from(&config.apis.modrinth), mods.clone()).await;
+    
+    let mut versions = get_versions(config, mods)?;
+    
+    projects.sort_by_key(|p| p.id.clone());
+
+    versions.sort_by_key(|v| v.mod_id.clone());
+    
+    let mut update_stack: Vec<String> = vec![];
+
+    for (index, project) in projects.iter().enumerate() {
+
+        let cmp_version = &versions[index];
+
+        let p_id = &project.id;
+        let v_id = &cmp_version.mod_id;
+
+        if p_id != v_id { return Err(Box::new(Error::new(ErrorKind::Other, "COMPARE_SORTING_ERR"))); };
+        println!("{}:{}", p_id, v_id);
+
+        if project.versions.join("|") != cmp_version.versions {
+            update_stack.push(String::from(&project.id));
+        };
+    };
+
+    //TODO UPDATE
+    dbg!(update_stack);
+
+    Ok(())
+}
diff --git a/src/config.rs b/src/config.rs
index ba1b46a..58d399a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,9 +1,10 @@
 use config::{Config, File, FileFormat};
 use serde::Deserialize;
 
-#[derive(Debug, Clone,Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct Cfg {
     pub data: String,
+    pub clean_remove: bool,
     pub apis: Apis,
 }
 
diff --git a/src/db.rs b/src/db.rs
index bbbca87..33d8344 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -1,36 +1,164 @@
 use std::io::ErrorKind;
 
-use crate::{Modloader, config::Cfg};
+use crate::{Modloader, config::Cfg, List, modrinth::Version, get_modloader};
 
 //TODO use prepared statements
 
-pub fn insert_mod(id: String, name: String, current_version: String, old_versions: Vec<String>, mod_loader: Modloader, desired_mc_version: String) -> Result<(), sqlite::Error> {
+//MODS
+pub fn insert_mod(config: Cfg, id: String, name: String, versions: Vec<String>) -> Result<(), sqlite::Error> {
 
-    let connection = sqlite::open("./data.db").unwrap();
+    println!("Inserting into modlist");
 
-    let loader = match mod_loader {
-        Modloader::Fabric => "fabric",
-        Modloader::Forge => "forge",
-    };
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let sql = format!("INSERT INTO mods VALUES ('{}', '{}', '{}')", id, name, versions.join("|"));
+
+    connection.execute(sql)
+}
+
+pub fn insert_mod_in_list(config: Cfg, list: List, id: String, current_version: String, applicable_versions: Vec<Version>) -> Result<(), sqlite::Error> {
+
+    println!("Inserting into current list");
+
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let mut applicable_versions_vec = vec![];
+
+    for ver in applicable_versions {
+        applicable_versions_vec.push(ver.id);
+    }
+
+    let sql = format!("INSERT INTO {} VALUES ('{}', '{}', '{}')", list.id, id, current_version, applicable_versions_vec.join("|"));
+
+    connection.execute(sql)
+}
+
+pub fn remove_mod_from_list(config: Cfg, list: List, mod_id: String) -> Result<(), sqlite::Error> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let sql = format!("DELETE FROM {} WHERE mod_id = '{}'", list.id, mod_id);
     
-    let sql = format!("INSERT INTO mods VALUES ('{}', '{}', '{}', '{}', '{}', '{}')", id, name, current_version, old_versions.join("|"), loader, desired_mc_version);
+    dbg!(&sql);
 
     connection.execute(sql)
 }
 
-//LIST
-pub fn insert_list(config: Cfg, id: String, mc_version: String, mod_loader: Modloader) -> Result<(), sqlite::Error> {
+pub fn get_mods(config: Cfg) -> Result<Vec<String>, Box<dyn std::error::Error>> {
+
     let data = format!("{}/data.db", config.data);
     let connection = sqlite::open(data).unwrap();
+
+    let sql = "SELECT id FROM mods";
     
-    //Setup list in table
-    let loader = match mod_loader {
-        Modloader::Fabric => "fabric",
-        Modloader::Forge => "forge",
+    let mut mods: Vec<String> = Vec::new();
+    //TODO catch sql errors better
+    connection.iterate(sql, |ids| {
+        if ids.is_empty() { return false; };
+        for &(_column, value) in ids.iter() {
+            mods.push(String::from(value.unwrap()));
+        }
+        true
+    }).unwrap();
+    match mods.is_empty() {
+        true => Err(Box::new(std::io::Error::new(ErrorKind::NotFound, "NO_MODS"))),
+        false => Ok(mods),
+    }
+}
+
+pub fn get_mods_from_list(config: Cfg, list: List) -> Result<Vec<String>, Box<dyn std::error::Error>> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let sql = format!("SELECT mod_id FROM {}", list.id);
+
+    let mut mods: Vec<String> = Vec::new();
+    //TODO catch sql errors better
+    connection.iterate(sql, |ids| {
+        if ids.is_empty() { return false; };
+        for &(_column, value) in ids.iter() {
+            mods.push(String::from(value.unwrap()));
+        }
+        true
+    }).unwrap();
+    match mods.is_empty() {
+        true => Err(Box::new(std::io::Error::new(ErrorKind::NotFound, "NO_MODS"))),
+        false => Ok(mods),
+    }
+}
+
+pub fn get_mod_id(config: Cfg, name: String) -> Result<String, Box<dyn std::error::Error>> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let sql = format!("SELECT id FROM mods WHERE name = '{}'", name);
+    
+    dbg!(&sql);
+
+    let mut modification = String::new();
+    //TODO catch sql errors better
+    connection.iterate(sql, |id| {
+        if id.is_empty() { return false; };
+        for &(_column, value) in id.iter() {
+            dbg!(&(_column, value));
+            modification = String::from(value.unwrap());
+        }
+        true
+    }).unwrap();
+    
+    dbg!(&modification);
+
+    if modification.is_empty() { return Err(Box::new(std::io::Error::new(ErrorKind::NotFound, "MOD_NOT_IN_DATABASE"))) };
+    
+    Ok(modification)
+}
+
+#[derive(Debug, Clone)]
+pub struct DBModlistVersions {
+    pub mod_id: String,
+    pub versions: String,
+}
+
+pub fn get_versions(config: Cfg, mods: Vec<String>) -> Result<Vec<DBModlistVersions>, Box<dyn std::error::Error>> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+    
+    let mut wherestr = String::from("WHERE");
+    for (i, id) in mods.iter().enumerate() {
+        let mut or = " OR";
+        if i == mods.len() - 1 { or = ""  }
+        println!("Pushing {}({}) | OR: '{}'", id, i, or);
+        wherestr = format!("{} id = '{}'{}", wherestr, id, or);
+    }
+
+    let sql = format!("SELECT id, versions FROM mods {}", wherestr);
+    
+    dbg!(&sql);
+
+    let mut versionmaps: Vec<DBModlistVersions> = Vec::new();
+    //TODO catch sql errors better
+    let mut cursor = connection.prepare(sql).unwrap().into_cursor();
+
+    while let Some(Ok(row)) = cursor.next() {
+        println!("{}: {}", row.get::<String, _>(0), row.get::<String, _>(1));
+        versionmaps.push(DBModlistVersions { mod_id: row.get::<String, _>(0), versions: row.get::<String, _>(1) })
     };
 
-    let sql_list = format!("INSERT INTO lists VALUES ('{}', '{}', '{}')", id, mc_version, loader);
-    let sql_table = format!("CREATE TABLE '{}' ( 'mod_id' TEXT, 'current_version' TEXT, 'applicable_versions' BLOB, 'mod_loader' TEXT )", id);
+    if versionmaps.is_empty() { return Err(Box::new(std::io::Error::new(ErrorKind::Other, "NO_MODS_ON_LIST"))); };
+
+    Ok(versionmaps)
+}
+
+
+//LIST
+pub fn insert_list(config: Cfg, id: String, mc_version: String, mod_loader: Modloader) -> Result<(), sqlite::Error> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+    
+    let sql_list = format!("INSERT INTO lists VALUES ('{}', '{}', '{}')", id, mc_version, mod_loader.stringify());
+    let sql_table = format!("CREATE TABLE '{}' ( 'mod_id' TEXT, 'current_version' TEXT, 'applicable_versions' BLOB)", id);
     let sql = format!("{};{};", sql_list, sql_table);
 
     connection.execute(sql)
@@ -68,6 +196,27 @@ pub fn get_lists(config: Cfg) -> Result<Vec<String>, Box<dyn std::error::Error>>
     }
 }
 
+pub fn get_list(config: Cfg, id: String) -> Result<List, Box<dyn std::error::Error>> {
+    let data = format!("{}/data.db", config.data);
+    let connection = sqlite::open(data).unwrap();
+
+    let sql = format!("SELECT mc_version, modloader FROM lists WHERE id = '{}'", id);
+    
+    let mut list = vec![];
+    //TODO catch sql errors better
+    connection.iterate(sql, |ids| {
+        if ids.is_empty() { return false; };
+        for &(_column, value) in ids.iter() {
+            list.push(String::from(value.unwrap()));
+        }
+        true
+    }).unwrap();
+
+    if list.len() != 2 { return Err(Box::new(std::io::Error::new(ErrorKind::InvalidData, "LIST_MISSING_DATA"))) };
+    
+    Ok(List { id, mc_version: String::from(&list[0]), modloader: get_modloader(String::from(&list[1]))? })
+}
+
 //config
 pub fn change_list(config: Cfg, id: String) -> Result<(), sqlite::Error> {
     let data = format!("{}/data.db", config.data);
@@ -78,7 +227,7 @@ pub fn change_list(config: Cfg, id: String) -> Result<(), sqlite::Error> {
     connection.execute(sql)
 }
 
-pub fn get_current_list(config: Cfg) -> Result<String, Box<dyn std::error::Error>> {
+pub fn get_current_list_id(config: Cfg) -> Result<String, Box<dyn std::error::Error>> {
     let data = format!("{}/data.db", config.data);
     let connection = sqlite::open(data).unwrap();
 
diff --git a/src/input.rs b/src/input.rs
index 061f1fd..0c13e67 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -1,5 +1,5 @@
 use std::io::{stdin, Error, ErrorKind};
-use crate::{add, config::Cfg, list};
+use crate::{config::Cfg, list, modification, update};
 
 pub struct Input {
     pub command: String,
@@ -41,15 +41,15 @@ pub async fn get_input(config: Cfg) -> Result<(), Box<dyn std::error::Error>> {
     let input = Input::from(user_input.trim().to_string())?;
 
     match input.command.as_str() {
-        "add" => { 
-            if input.args == None { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_FEW_ARGUMENTS"))) };
-            if input.args.as_ref().unwrap().len() != 1 { return Err(Box::new(Error::new(ErrorKind::InvalidInput, "TOO_MANY_ARGUMENTS"))) };
-            add(config, input.args.unwrap()[0].to_string()).await?;
-            Ok(()) 
+        "mod" => { 
+            modification(config, input.args).await
         },
         "list" => {
             list(config, input.args)
         },
+        "update" => {
+            update(config).await
+        },
         _ => Err(Box::new(Error::new(ErrorKind::InvalidInput, "UNKNOWN_COMMAND"))),
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 4ad7c39..e059293 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,11 +4,31 @@ pub mod commands;
 pub mod input;
 pub mod db;
 
+use std::io::{Error, ErrorKind};
+
 pub use apis::*;
 pub use commands::*;
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub enum Modloader {
     Fabric,
     Forge
 }
+
+impl Modloader {
+    fn stringify(&self) -> String {
+        match self {
+            Modloader::Fabric => String::from("fabric"),
+            Modloader::Forge => String::from("forge"),
+        }
+    }
+
+}
+
+pub fn get_modloader(string: String) -> Result<Modloader, Box<dyn std::error::Error>> {
+    match string.as_str() {
+        "forge" => Ok(Modloader::Forge),
+        "fabric" => Ok(Modloader::Fabric),
+        _ => Err(Box::new(Error::new(ErrorKind::InvalidData, "UNKNOWN_MODLOADER")))
+    }
+}