diff --git a/CMakeLists.txt b/CMakeLists.txt
index 15bafd081654175089b44f3b4cd6ba46afa053f2..dde6385a38a7c04261df1da786f2b2250ae57395 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,8 +12,10 @@ include(CheckNotInSources)
 
 project (Pastis)
 
+# Rang (colors? Useless thus necessary!)
+include_directories(${CMAKE_SOURCE_DIR}/packages/rang/include)
+
 # CLI11
-add_subdirectory(${CMAKE_SOURCE_DIR}/packages/CLI11)
 include_directories(${CMAKE_SOURCE_DIR}/packages/CLI11/include)
 
 # Kokkos
diff --git a/main.cpp b/main.cpp
index 4daf0270a5efee866732203b5fbbae946c592492..eeab23dc1ef6bcf101d0403d82d55045bda0112a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,29 +1,41 @@
 #include <iostream>
 #include <Kokkos_Core.hpp>
 #include <RevisionInfo.hpp>
+#include <rang.hpp>
 
 #include <CLI/CLI.hpp>
 
 int main(int argc, char *argv[])
 {
-  std::cout << "It's pastis time!\n";
+  CLI::App app{"Pastis help"};
+
+  long number = 1000;
+  app.add_option("-n,--number", number, "A big integer");
+
+  CLI11_PARSE(app, argc, argv);
 
   std::cout << "--------------------- git info --------------------------\n";
-  std::cout << "* version: " << RevisionInfo::version() << '\n';
-  std::cout << "* head: " << RevisionInfo::head() << '\n';
-  std::cout << "* hash: " << RevisionInfo::hash() << "  (" << RevisionInfo::isClean() << ")\n";
+  std::cout << "* version: " << rang::style::bold << RevisionInfo::version() << rang::style::reset << '\n';
+  std::cout << "* HEAD: " << rang::style::underline << RevisionInfo::head() << rang::style::reset << '\n';
+  std::cout << "* hash: " << RevisionInfo::hash() << "  (";
+  if (RevisionInfo::isClean()) {
+    std::cout << rang::fgB::green << "clean" << rang::fg::reset;
+  } else {
+    std::cout << rang::fgB::red << "dirty" << rang::fg::reset; 
+  }
+  std::cout << ")\n";
   std::cout << "---------------------------------------------------------\n";
 
   Kokkos::initialize(argc, argv);
   Kokkos::DefaultExecutionSpace::print_configuration(std::cout);
 
-  if (argc < 2) {
-    fprintf(stderr, "Usage: %s [<kokkos_options>] <size>\n", argv[0]);
-    Kokkos::finalize();
-    exit(1);
-  }
+  // if (argc < 2) {
+  //   fprintf(stderr, "Usage: %s [<kokkos_options>] <size>\n", argv[0]);
+  //   Kokkos::finalize();
+  //   exit(1);
+  // }
 
-  const long n = strtol(argv[1], NULL, 10);
+  const long& n = number;
   std::cout << "Number of even integers from 0 to " << n - 1 << '\n';
 
   Kokkos::Timer timer;
@@ -31,12 +43,12 @@ int main(int argc, char *argv[])
 
   // Compute the number of even integers from 0 to n-1, in parallel.
   long count = 0;
-  Kokkos::parallel_reduce(n, KOKKOS_LAMBDA (const long i, long& lcount) {
+  Kokkos::parallel_reduce(n, [=] (const long i, long& lcount) {
     lcount += (i % 2) == 0;
   }, count);
 
   double count_time = timer.seconds();
-  std::cout << "  Parallel: " << count << " " << count_time << '\n';
+  std::cout << "  Parallel: " << count << " " << rang::style::bold << count_time << rang::style::reset << '\n';
 
   timer.reset();
 
@@ -46,9 +58,8 @@ int main(int argc, char *argv[])
     seq_count += (i % 2) == 0;
   }
 
-  int k =3;
   count_time = timer.seconds();
-  std::cout << "Sequential: " << seq_count << ' ' <<  count_time << '\n';
+  std::cout << "Sequential: " << seq_count << ' ' << rang::style::bold << count_time << rang::style::reset << '\n';
   Kokkos::finalize();
 
   return (count == seq_count) ? 0 : -1;
diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index e08c25820a511ec82ceefe278c068674ff9343a1..3846348f1f7916019026ea2ea3d65bca1850aaf2 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -4,9 +4,11 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/cmake-modules")
 include(GetGitRevisionDescription)
 
-git_describe(PASTISVERSION "--abbrev=0")
-get_git_head_revision(PASTISHEAD PASTISHASH)
-git_local_changes(PASTISHASLOCALCHANGES)
+git_describe(PASTIS_VERSION "--abbrev=0")
+get_git_head_revision(PASTIS_HEAD PASTIS_HASH)
+git_local_changes(PASTIS_HAS_LOCAL_CHANGES)
+
+set(PASTIS_IS_CLEAN ${PASTIS_HAS_LOCAL_CHANGES} STREQ "CLEAN")
 
 add_custom_target(git_revision ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/pastis_git_revision.hpp)
 set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/pastis_git_revision.hpp PROPERTIES GENERATED TRUE HEADER_FILE_ONLY TRUE)
diff --git a/utils/RevisionInfo.cpp b/utils/RevisionInfo.cpp
index 712aa5152ffb072ac291456b006240c5e564207c..cd4a303accbaad42a2173400d634b8c2456d815f 100644
--- a/utils/RevisionInfo.cpp
+++ b/utils/RevisionInfo.cpp
@@ -3,20 +3,24 @@
 
 std::string RevisionInfo::version()
 {
-  return PASTISVERSION;
+  return PASTIS_VERSION;
 }
 
 std::string RevisionInfo::head()
 {
-  return PASTISHEAD;
+  return PASTIS_HEAD;
 }
 
 std::string RevisionInfo::hash()
 {
-  return PASTISHASH;
+  return PASTIS_HASH;
 }
 
-std::string RevisionInfo::isClean()
+bool RevisionInfo::isClean()
 {
-  return PASTISHASLOCALCHANGES;
+#if PASTIS_IS_CLEAN
+  return true;
+#else
+  return false;
+#endif
 }
diff --git a/utils/RevisionInfo.hpp b/utils/RevisionInfo.hpp
index 57219226b6fff90ca11e590f25f0816788bb56ea..4f1fee3b0e3f36c8f01ebaec78fc3c2b7c0bd4bc 100644
--- a/utils/RevisionInfo.hpp
+++ b/utils/RevisionInfo.hpp
@@ -8,7 +8,7 @@ struct RevisionInfo
   static std::string version();
   static std::string head();
   static std::string hash();
-  static std::string isClean();
+  static bool isClean();
 };
 
 #endif // REVISION_INFO_HPP
diff --git a/utils/pastis_git_revision.hpp.in b/utils/pastis_git_revision.hpp.in
index 0398abebe6b4d43ba155e5e7ad47c4dcc2443e0b..067456974be1ab1e8a225e19987fd9a5767a7403 100644
--- a/utils/pastis_git_revision.hpp.in
+++ b/utils/pastis_git_revision.hpp.in
@@ -1,9 +1,9 @@
 #ifndef GIT_REVISION_HPP
 #define GIT_REVISION_HPP
 
-#define PASTISVERSION "@PASTISVERSION@"
-#define PASTISHEAD "@PASTISHEAD@"
-#define PASTISHASH "@PASTISHASH@"
-#define PASTISHASLOCALCHANGES "@PASTISHASLOCALCHANGES@"
+#define PASTIS_VERSION "@PASTIS_VERSION@"
+#define PASTIS_HEAD "@PASTIS_HEAD@"
+#define PASTIS_HASH "@PASTIS_HASH@"
+#define PASTIS_HAS_LOCAL_CHANGES "@PASTIS_HAS_LOCAL_CHANGES@"
 
 #endif // GIT_REVISION_HPP