diff --git a/CMakeLists.txt b/CMakeLists.txt
index f7d4f53..aabf244 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,13 @@ cmake_minimum_required(VERSION 3.7)
 
 project(ceev)
 
+execute_process(
+    COMMAND git status --porcelain=v1 --ignored=no
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE GIT_ISCOMMITTED
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+string(COMPARE EQUAL "${GIT_ISCOMMITTED}" "" is_committed)
+
 execute_process(
     COMMAND git rev-parse --short HEAD
     WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
@@ -26,6 +33,11 @@ execute_process(
     OUTPUT_VARIABLE GIT_COMMIT_AUTHOR
     OUTPUT_STRIP_TRAILING_WHITESPACE)
 
+if(NOT is_committed)
+    set(GIT_COMMIT_HASH "${GIT_COMMIT_HASH}-dev")
+    set(GIT_COMMIT_DATE "Not committed yet")
+endif()
+
 set(CMAKE_CXX_STANDARD 17)
 find_package(SDL2 REQUIRED)
 include_directories(${SDL2_INCLUDE_DIRS})
diff --git a/src/ceev.cc b/src/ceev.cc
index eb88da1..56bb921 100644
--- a/src/ceev.cc
+++ b/src/ceev.cc
@@ -336,7 +336,13 @@ int devel_sdl2(std::deque<std::string> args) {
 
 int devel_lang(std::deque<std::string> args) {
     NYI;
-    return 1;
+    if (args.empty()) {
+        std::cout << bg_red(bold("ERROR")) << ": You need to specify a file"
+                  << std::endl;
+        return 1;
+    }
+    read_file(args);
+    return 0;
 }
 
 int main(int argc, char** argv) {
diff --git a/src/ceev.h b/src/ceev.h
index 4501bf5..a016470 100644
--- a/src/ceev.h
+++ b/src/ceev.h
@@ -2,6 +2,7 @@
 
 #include <SDL2/SDL.h>
 #include <ceev/colors.h>
+#include <ceev/lang.h>
 #include <unistd.h>
 #include <algorithm>
 #include <cstdlib>