feat:add color and ttl check

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.16)
 project(jsonschema VERSION 4.3.0 LANGUAGES CXX)
 list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
 include(vendor/noa/cmake/noa.cmake)
-
+include_directories(vendor/termcolor/include)
 # Options
 option(JSONSCHEMA_TESTS "Build the JSON Schema CLI tests" OFF)
 option(JSONSCHEMA_TESTS_CI "Build the JSON Schema CLI CI tests" OFF)

DEPENDENCIES

@@ -5,3 +5,4 @@ hydra https://github.com/sourcemeta/hydra a4a74f3cabd32f2f829f449d67339dac33f991
 alterschema https://github.com/sourcemeta/alterschema 92e370ce9c1f0582014b54d43e388ee012dfe13d
 jsonbinpack https://github.com/sourcemeta/jsonbinpack d777179441d3c703e1fda1187742541aa26836b5
 blaze https://github.com/sourcemeta/blaze 4db8309470369332d3d0658ade9402a37abe418e
+termcolor https://github.com/ikalnytskyi/termcolor.git v2.1.0

src/main.cc

@@ -11,6 +11,13 @@
 
 #include "command.h"
 #include "configure.h"
+#ifdef _WIN32
+#include <io.h>
+#define isatty _isatty
+#else
+#include <unistd.h>
+#endif
+#include <termcolor/termcolor.hpp>
 
 constexpr std::string_view USAGE_DETAILS{R"EOF(
 Global Options:
@@ -88,6 +95,13 @@ For more documentation, visit https://github.com/sourcemeta/jsonschema
 
 auto jsonschema_main(const std::string &program, const std::string &command,
                      const std::span<const std::string> &arguments) -> int {
+  bool use_colors = true;
+  if (std::find(arguments.begin(), arguments.end(), "--no-color") !=
+      arguments.end()) {
+    use_colors = false;
+  } else if (!isatty(fileno(stdout))) {
+    use_colors = false;
+  }
   if (command == "fmt") {
     return sourcemeta::jsonschema::cli::fmt(arguments);
   } else if (command == "frame") {
@@ -112,12 +126,18 @@ auto jsonschema_main(const std::string &program, const std::string &command,
     return sourcemeta::jsonschema::cli::encode(arguments);
   } else if (command == "decode") {
     return sourcemeta::jsonschema::cli::decode(arguments);
-  } else {
+  }
+  {
     std::cout << "JSON Schema CLI - v"
               << sourcemeta::jsonschema::cli::PROJECT_VERSION << "\n";
     std::cout << "Usage: " << std::filesystem::path{program}.filename().string()
               << " <command> [arguments...]\n";
-    std::cout << USAGE_DETAILS;
+    if (use_colors) {
+      std::cout << termcolor::yellow << USAGE_DETAILS << termcolor::reset
+                << "\n";
+    } else {
+      std::cout << USAGE_DETAILS << "\n";
+    }
     return EXIT_SUCCESS;
   }
 }