nobu	2015-05-12 15:50:05 +0900 (Tue, 12 May 2015)

  New Revision: 50472

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=50472

  Log:
    vm_dump.c: highlight preface
    
    * vm_dump.c (preface_dump): highlight very important but very
      ofhen ignored message like a Xmas tree.

  Modified files:
    trunk/vm_dump.c
Index: vm_dump.c
===================================================================
--- vm_dump.c	(revision 50471)
+++ vm_dump.c	(revision 50472)
@@ -950,8 +950,29 @@ preface_dump(void) https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L950
 	"     * /Library/Logs/DiagnosticReports\n"
 	"   for more details.\n"
 	"\n";
+    const char *const endmsg = msg + sizeof(msg) - 1;
+    const char *p = msg;
+#define RED "\033[;31;1;7m"
+#define GREEN "\033[;32;7m"
+#define RESET "\033[m"
 
-    fputs(msg, stderr);
+    if (isatty(fileno(stderr))) {
+	const char *e = strchr(p, '\n');
+	const int w = (int)(e - p);
+	fputs(RED, stderr);
+	fwrite(p, 1, w, stderr);
+	fputs(RESET, stderr);
+	fputc('\n', stderr);
+	while ((p = e + 1) < endmsg && (e = strchr(p, '\n')) != 0 && e > p + 1) {
+	    int i = (int)(e - p);
+	    fputs(GREEN, stderr);
+	    fwrite(p, 1, e - p, stderr);
+	    for (; i < w; ++i) fputc(' ', stderr);
+	    fputs(RESET, stderr);
+	    fputc('\n', stderr);
+	}
+    }
+    fwrite(p, 1, endmsg - p, stderr);
 #endif
 }
 

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