diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 0c8aaf4..9b42106 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1 @@
-.ccls-cache/
-*/.ccls-cache/
-*/target/
+.direnv/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..a2dfd6d
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1709204812,
+        "narHash": "sha256-EjFkpUjz1iV4LZJwgd3PqyLkuyrxrJLobrpNUUumXeI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "728d2d1fd999b9be599793a12bae719709129577",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..8ccd411
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,40 @@
+{
+    description = "compilers and interpreters for jpp";
+
+    inputs = {
+        nixpkgs.url = "github:NixOS/nixpkgs";
+    };
+
+    outputs = {
+        nixpkgs,
+        ...
+    }: let 
+        systems = [ "x86_64-linux" "aarch64-linux" ];
+        forEachSystem = nixpkgs.lib.genAttrs systems;
+        pkgsForEach = nixpkgs.legacyPackages;
+    in {
+        devShells = forEachSystem (system: 
+            let 
+                pkgs = pkgsForEach.${system};
+            in {
+                default = pkgs.mkShell {
+                    name = "jpp";
+
+                    nativeBuildInputs = with pkgs; [
+                        gcc
+                        clang
+                        gnat
+                        alire
+                        gprbuild
+                        jdk
+                        go
+                        ghc
+                        clisp
+                        smlnj
+                        swiProlog
+                    ];
+                };
+            }
+        );
+    };
+}
diff --git a/lab0/HelloWorld.hs b/lab0/HelloWorld.hs
new file mode 100644
index 0000000..98f25e4
--- /dev/null
+++ b/lab0/HelloWorld.hs
@@ -0,0 +1,4 @@
+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, World!"
diff --git a/lab0/HelloWorld.java b/lab0/HelloWorld.java
new file mode 100644
index 0000000..70fd330
--- /dev/null
+++ b/lab0/HelloWorld.java
@@ -0,0 +1,5 @@
+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
diff --git a/lab0/hello-world.go b/lab0/hello-world.go
new file mode 100644
index 0000000..b7d2a32
--- /dev/null
+++ b/lab0/hello-world.go
@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello, World!")
+}
diff --git a/lab0/hello_world.adb b/lab0/hello_world.adb
new file mode 100644
index 0000000..9e04e39
--- /dev/null
+++ b/lab0/hello_world.adb
@@ -0,0 +1,6 @@
+with Ada.Text_IO;
+
+procedure Hello_World is
+begin
+    Ada.Text_IO.Put_Line ("Hello, World!");
+end Hello_World;
diff --git a/lab0/helloworld.c b/lab0/helloworld.c
new file mode 100644
index 0000000..63f8805
--- /dev/null
+++ b/lab0/helloworld.c
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(void) {
+    printf("Hello, World!\n");
+    return 0;
+}
diff --git a/lab0/helloworld.cpp b/lab0/helloworld.cpp
new file mode 100644
index 0000000..ad8283b
--- /dev/null
+++ b/lab0/helloworld.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main() {
+    std::cout << "Hello, World!\n";
+    return 0;
+}
diff --git a/lab0/helloworld.lisp b/lab0/helloworld.lisp
new file mode 100644
index 0000000..582db12
--- /dev/null
+++ b/lab0/helloworld.lisp
@@ -0,0 +1,4 @@
+(defun helloworld ()
+  (format t "Hello, World!~%"))
+
+(helloworld)
diff --git a/lab0/helloworld.pl b/lab0/helloworld.pl
new file mode 100644
index 0000000..12d35b4
--- /dev/null
+++ b/lab0/helloworld.pl
@@ -0,0 +1,6 @@
+main :-
+    write("Hello, World!").
+
+:- main.
+
+% vi: ft=prolog
diff --git a/lab0/helloworld.sml b/lab0/helloworld.sml
new file mode 100644
index 0000000..9074bbc
--- /dev/null
+++ b/lab0/helloworld.sml
@@ -0,0 +1 @@
+print "Hello, World!\n";
diff --git a/lab1/.gitignore b/lab1/.gitignore
new file mode 100644
index 0000000..0c8aaf4
--- /dev/null
+++ b/lab1/.gitignore
@@ -0,0 +1,3 @@
+.ccls-cache/
+*/.ccls-cache/
+*/target/
diff --git a/zad1/.ccls b/lab1/zad1/.ccls
similarity index 100%
rename from zad1/.ccls
rename to lab1/zad1/.ccls
diff --git a/zad1/Makefile b/lab1/zad1/Makefile
similarity index 100%
rename from zad1/Makefile
rename to lab1/zad1/Makefile
diff --git a/zad1/include/mod.h b/lab1/zad1/include/mod.h
similarity index 100%
rename from zad1/include/mod.h
rename to lab1/zad1/include/mod.h
diff --git a/zad1/src/main.c b/lab1/zad1/src/main.c
similarity index 100%
rename from zad1/src/main.c
rename to lab1/zad1/src/main.c
diff --git a/zad1/src/mod_iter.c b/lab1/zad1/src/mod_iter.c
similarity index 100%
rename from zad1/src/mod_iter.c
rename to lab1/zad1/src/mod_iter.c
diff --git a/zad1/src/mod_rec.c b/lab1/zad1/src/mod_rec.c
similarity index 100%
rename from zad1/src/mod_rec.c
rename to lab1/zad1/src/mod_rec.c
diff --git a/zad2/.gitignore b/lab1/zad2/.gitignore
similarity index 100%
rename from zad2/.gitignore
rename to lab1/zad2/.gitignore
diff --git a/zad2/iter/module.adb b/lab1/zad2/iter/module.adb
similarity index 100%
rename from zad2/iter/module.adb
rename to lab1/zad2/iter/module.adb
diff --git a/zad2/rec/module.adb b/lab1/zad2/rec/module.adb
similarity index 100%
rename from zad2/rec/module.adb
rename to lab1/zad2/rec/module.adb
diff --git a/zad2/src/main.adb b/lab1/zad2/src/main.adb
similarity index 100%
rename from zad2/src/main.adb
rename to lab1/zad2/src/main.adb
diff --git a/zad2/src/module.ads b/lab1/zad2/src/module.ads
similarity index 100%
rename from zad2/src/module.ads
rename to lab1/zad2/src/module.ads
diff --git a/zad2/zad2.gpr b/lab1/zad2/zad2.gpr
similarity index 100%
rename from zad2/zad2.gpr
rename to lab1/zad2/zad2.gpr
diff --git a/zad3/Cargo.lock b/lab1/zad3/Cargo.lock
similarity index 100%
rename from zad3/Cargo.lock
rename to lab1/zad3/Cargo.lock
diff --git a/zad3/Cargo.toml b/lab1/zad3/Cargo.toml
similarity index 100%
rename from zad3/Cargo.toml
rename to lab1/zad3/Cargo.toml
diff --git a/zad3/src/main.rs b/lab1/zad3/src/main.rs
similarity index 100%
rename from zad3/src/main.rs
rename to lab1/zad3/src/main.rs
diff --git a/zad3/src/module.rs b/lab1/zad3/src/module.rs
similarity index 100%
rename from zad3/src/module.rs
rename to lab1/zad3/src/module.rs
diff --git a/zad4/.ccls b/lab1/zad4/.ccls
similarity index 100%
rename from zad4/.ccls
rename to lab1/zad4/.ccls
diff --git a/zad4/include/wrapper.h b/lab1/zad4/include/wrapper.h
similarity index 100%
rename from zad4/include/wrapper.h
rename to lab1/zad4/include/wrapper.h
diff --git a/zad4/iter/module.adb b/lab1/zad4/iter/module.adb
similarity index 100%
rename from zad4/iter/module.adb
rename to lab1/zad4/iter/module.adb
diff --git a/zad4/rec/module.adb b/lab1/zad4/rec/module.adb
similarity index 100%
rename from zad4/rec/module.adb
rename to lab1/zad4/rec/module.adb
diff --git a/zad4/src/main.c b/lab1/zad4/src/main.c
similarity index 100%
rename from zad4/src/main.c
rename to lab1/zad4/src/main.c
diff --git a/zad4/src/module.ads b/lab1/zad4/src/module.ads
similarity index 100%
rename from zad4/src/module.ads
rename to lab1/zad4/src/module.ads
diff --git a/zad4/zad4.gpr b/lab1/zad4/zad4.gpr
similarity index 100%
rename from zad4/zad4.gpr
rename to lab1/zad4/zad4.gpr
diff --git a/zad5/.ccls b/lab1/zad5/.ccls
similarity index 100%
rename from zad5/.ccls
rename to lab1/zad5/.ccls
diff --git a/zad5/include/mod.h b/lab1/zad5/include/mod.h
similarity index 100%
rename from zad5/include/mod.h
rename to lab1/zad5/include/mod.h
diff --git a/zad5/iter/mod.c b/lab1/zad5/iter/mod.c
similarity index 100%
rename from zad5/iter/mod.c
rename to lab1/zad5/iter/mod.c
diff --git a/zad5/rec/mod.c b/lab1/zad5/rec/mod.c
similarity index 100%
rename from zad5/rec/mod.c
rename to lab1/zad5/rec/mod.c
diff --git a/zad5/src/main.adb b/lab1/zad5/src/main.adb
similarity index 100%
rename from zad5/src/main.adb
rename to lab1/zad5/src/main.adb
diff --git a/zad5/zad5.gpr b/lab1/zad5/zad5.gpr
similarity index 100%
rename from zad5/zad5.gpr
rename to lab1/zad5/zad5.gpr
diff --git a/zad6/.ccls b/lab1/zad6/.ccls
similarity index 100%
rename from zad6/.ccls
rename to lab1/zad6/.ccls
diff --git a/zad6/Cargo.lock b/lab1/zad6/Cargo.lock
similarity index 100%
rename from zad6/Cargo.lock
rename to lab1/zad6/Cargo.lock
diff --git a/zad6/Cargo.toml b/lab1/zad6/Cargo.toml
similarity index 100%
rename from zad6/Cargo.toml
rename to lab1/zad6/Cargo.toml
diff --git a/zad6/build.rs b/lab1/zad6/build.rs
similarity index 100%
rename from zad6/build.rs
rename to lab1/zad6/build.rs
diff --git a/zad6/src/main.rs b/lab1/zad6/src/main.rs
similarity index 100%
rename from zad6/src/main.rs
rename to lab1/zad6/src/main.rs
diff --git a/zad6/src/mod_iter.c b/lab1/zad6/src/mod_iter.c
similarity index 100%
rename from zad6/src/mod_iter.c
rename to lab1/zad6/src/mod_iter.c
diff --git a/zad6/src/mod_rec.c b/lab1/zad6/src/mod_rec.c
similarity index 100%
rename from zad6/src/mod_rec.c
rename to lab1/zad6/src/mod_rec.c
diff --git a/zad7/.ccls b/lab1/zad7/.ccls
similarity index 100%
rename from zad7/.ccls
rename to lab1/zad7/.ccls
diff --git a/zad7/Cargo.lock b/lab1/zad7/Cargo.lock
similarity index 100%
rename from zad7/Cargo.lock
rename to lab1/zad7/Cargo.lock
diff --git a/zad7/Cargo.toml b/lab1/zad7/Cargo.toml
similarity index 100%
rename from zad7/Cargo.toml
rename to lab1/zad7/Cargo.toml
diff --git a/zad7/Makefile b/lab1/zad7/Makefile
similarity index 100%
rename from zad7/Makefile
rename to lab1/zad7/Makefile
diff --git a/zad7/c/main.c b/lab1/zad7/c/main.c
similarity index 100%
rename from zad7/c/main.c
rename to lab1/zad7/c/main.c
diff --git a/zad7/c/wrapper.h b/lab1/zad7/c/wrapper.h
similarity index 100%
rename from zad7/c/wrapper.h
rename to lab1/zad7/c/wrapper.h
diff --git a/zad7/src/iter.rs b/lab1/zad7/src/iter.rs
similarity index 100%
rename from zad7/src/iter.rs
rename to lab1/zad7/src/iter.rs
diff --git a/zad7/src/lib.rs b/lab1/zad7/src/lib.rs
similarity index 100%
rename from zad7/src/lib.rs
rename to lab1/zad7/src/lib.rs
diff --git a/zad7/src/rec.rs b/lab1/zad7/src/rec.rs
similarity index 100%
rename from zad7/src/rec.rs
rename to lab1/zad7/src/rec.rs