4 files changed, 124 insertions, 3 deletions

diff --git a/src/sheet/loader.rs b/src/sheet/loader.rs
new file mode 100644
index 0000000..613d2a5
--- /dev/null
+++ b/src/sheet/loader.rs
@@ -0,0 +1,55 @@
+use std::{
+    collections::HashMap,
+    path::Path,
+    sync::{Mutex, MutexGuard},
+};
+
+use lazy_static::lazy_static;
+use mlua::{Lua, UserData};
+
+use crate::lua::{ownedfunction::OwnedFunction, runnable::Runnable};
+
+use super::{register::SheetId, tablized::Tablized};
+
+lazy_static! {
+    static ref GLOBAL_LOADER: Mutex<Loader> = Mutex::new(Loader::new());
+}
+
+#[derive(Default)]
+pub struct Loader {
+    loaders: HashMap<String, Box<dyn Runnable<String, Tablized>>>,
+}
+
+impl Loader {
+    pub fn new() -> Self {
+        Self {
+            loaders: HashMap::new(),
+        }
+    }
+
+    pub fn load_sheet(&self, path: String, lua: &Lua) -> Option<SheetId> {
+        let p = Path::new(&path);
+        let loader = self.loaders.get(p.extension()?.to_str()?)?;
+        match loader.run(path, lua) {
+            Ok(table) => table.to_sheet(lua).ok(),
+            Err(_) => None,
+        }
+    }
+
+    pub fn add(&mut self, extension: String, func: Box<dyn Runnable<String, Tablized>>) {
+        self.loaders.insert(extension, func);
+    }
+
+    pub fn get() -> MutexGuard<'static, Loader> {
+        GLOBAL_LOADER.lock().unwrap()
+    }
+}
+
+impl UserData for Loader {
+    fn add_methods<'lua, M: mlua::prelude::LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
+        methods.add_function("add", |_, (extension, func): (String, OwnedFunction)| {
+            GLOBAL_LOADER.lock().unwrap().add(extension, Box::new(func));
+            Ok(())
+        });
+    }
+}
diff --git a/src/sheet/mod.rs b/src/sheet/mod.rs
index ffaec94..118e2ca 100644
--- a/src/sheet/mod.rs
+++ b/src/sheet/mod.rs
@@ -4,6 +4,8 @@ pub mod cell;
 pub mod map;
 pub mod register;
 pub mod luaref;
+pub mod loader;
+pub mod tablized;
 
 #[derive(Debug, Default)]
 pub struct Sheet {
diff --git a/src/sheet/register.rs b/src/sheet/register.rs
index c43720d..aaf9c35 100644
--- a/src/sheet/register.rs
+++ b/src/sheet/register.rs
@@ -2,7 +2,7 @@ use std::sync::{Arc, RwLock};
 
 use mlua::{Table, UserData, Value};
 
-use super::{cell::Cell, Sheet, luaref::SheetLuaRef};
+use super::{cell::Cell, loader::Loader, luaref::SheetLuaRef, Sheet};
 
 static REGISTER: RwLock<Vec<Arc<RwLock<Sheet>>>> = RwLock::new(Vec::new());
 
@@ -59,7 +59,7 @@ impl Register {
 
 impl UserData for Register {
     fn add_methods<'lua, M: mlua::UserDataMethods<'lua, Self>>(methods: &mut M) {
-        methods.add_function_mut("create", |lua, table: Table| {
+        methods.add_function("create", |lua, table: Table| {
             let id = Register::create_from_table(table)?;
             let luaref = SheetLuaRef::new(id);
             if let Ok(ud) = lua.create_userdata(luaref) {
@@ -69,7 +69,11 @@ impl UserData for Register {
             }
         });
 
-        methods.add_function_mut("get", |lua, id: SheetId| {
+        methods.add_function("open", |lua, path: String| {
+            Ok(Loader::get().load_sheet(path, lua))
+        });
+
+        methods.add_function("get", |lua, id: SheetId| {
             if Register::get(id).is_some() {
                 let luaref = SheetLuaRef::new(id);
                 if let Ok(ud) = lua.create_userdata(luaref) {
diff --git a/src/sheet/tablized.rs b/src/sheet/tablized.rs
new file mode 100644
index 0000000..a40af0d
--- /dev/null
+++ b/src/sheet/tablized.rs
@@ -0,0 +1,60 @@
+use mlua::{FromLuaMulti, Lua, RegistryKey};
+
+use super::{
+    cell::Cell,
+    register::{Register, SheetId},
+};
+
+pub enum Tablized {
+    Vector(Vec<Vec<Cell>>),
+    Table(RegistryKey),
+}
+
+impl Tablized {
+    pub fn to_sheet(&self, lua: &Lua) -> mlua::Result<SheetId> {
+        match self {
+            Tablized::Vector(v) => {
+                let rows = v.len();
+                let columns = v
+                    .iter()
+                    .max_by_key(|v| v.len())
+                    .unwrap_or(&Vec::new())
+                    .len();
+
+                let id = Register::create(columns, rows);
+                let lock = Register::get(id).unwrap();
+                let mut sheet = lock.write().unwrap();
+
+                for row in 0..rows {
+                    for column in 0..columns {
+                        if let Some(value) = v.get(row).and_then(|c| c.get(column)) {
+                            sheet.set_cell(row, column, value.clone())
+                        }
+                    }
+                }
+
+                Ok(id)
+            }
+            Tablized::Table(key) => {
+                let table = lua.registry_value(key)?;
+                Register::create_from_table(table)
+            },
+        }
+    }
+}
+
+impl<'lua> FromLuaMulti<'lua> for Tablized {
+    fn from_lua_multi(
+        values: mlua::prelude::LuaMultiValue<'lua>,
+        lua: &'lua mlua::prelude::Lua,
+    ) -> mlua::prelude::LuaResult<Self> {
+        if let Some(value) = values.get(0) {
+            if value.is_table() {
+                let key = lua.create_registry_value(value)?;
+                return Ok(Self::Table(key));
+            }
+        }
+
+        Err(mlua::Error::runtime("table needed"))
+    }
+}