Add xy_log() and xy_info() xy_error()

helper.h

@@ -11,6 +11,7 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <stdbool.h>
 
 #ifdef _WIN32
   #include <windows.h>
@@ -43,6 +44,53 @@ xy_strjoin (const char* str1, const char* str2)
 }
 
 
+#define XY_INFO     1
+#define XY_SUCCESS  1<<1
+#define XY_WARN     1<<2
+#define XY_ERROR    1<<3
+
+static void
+xy_log (int level, const char* str)
+{
+  char* color_fmt_str = NULL;
+
+  bool to_stderr = false;
+
+  if (level & XY_INFO) {
+    color_fmt_str = "\033[34m%s\033[0m";   // 蓝色
+  }
+  else if (level & XY_SUCCESS) {
+    color_fmt_str = "\033[32m%s\033[0m";   // 绿色
+  }
+  else if (level & XY_WARN) {
+    color_fmt_str = "\033[33m%s\033[0m\n"; // 黄色
+    to_stderr = true;
+  }
+  else if (level & XY_ERROR) {
+    color_fmt_str = "\033[31m%s\033[0m\n"; // 红色
+    to_stderr = true;
+  }
+  else {
+    //xy_assert ("CAN'T REACH!");
+  }
+
+  // -2 把中间%s减掉，-1 把末尾nul减掉
+  size_t len = sizeof(color_fmt_str) -2 -1;
+  char* buf = malloc(strlen(str) + len + 1);
+
+  sprintf (buf, color_fmt_str, str);
+  if (to_stderr) {
+    fprintf(stderr, buf);
+  } else {
+    puts(buf);
+  }
+  free(buf);
+}
+
+#define xy_info(str)  xy_log (XY_INFO,  str)
+#define xy_error(str) xy_log (XY_ERROR, str)
+
+
 static void
 xy_success (const char* str1)
 {