Don't create bookmark files on OSX that start with a dot.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_logging.h"
 #include "chrome/browser/search/search.h"
@@ skipping 704 matching lines @@
 
 // Returns if there is already a file |name| at dir NSURL |base|.
 static BOOL FileAlreadyExists(NSURL* base, NSString* name) {
   NSString* path = PathWithBaseURLAndName(base, name);
   DCHECK([path hasSuffix:name]);
   return [[NSFileManager defaultManager] fileExistsAtPath:path];
 }
 
 // Takes a destination URL, a suggested file name, & an extension (eg .webloc).
 // Returns the complete file name with extension you should use.
-// The name returned will not contain /, : or ?, will not be longer than
-// kMaxNameLength + length of extension, and will not be a file name that
-// already exists in that directory. If necessary it will try appending a space
-// and a number to the name (but before the extension) trying numbers up to and
-// including kMaxIndex.
+// The name returned will not contain /, : or ?, will not start with a dot,
+// will not be longer than kMaxNameLength + length of extension, and will not
+// be a file name that already exists in that directory. If necessary it will
+// try appending a space and a number to the name (but before the extension)
+// trying numbers up to and including kMaxIndex.
 // If the function gives up it returns nil.
 static NSString* UnusedLegalNameForNewDropFile(NSURL* saveLocation,
                                                NSString *fileName,
                                                NSString *extension) {
   int number = 1;
   const int kMaxIndex = 20;
   const unsigned kMaxNameLength = 64; // Arbitrary.
 
   NSString* filteredName = [fileName stringByReplacingOccurrencesOfString:@"/"
                                                                withString:@"-"];
   filteredName = [filteredName stringByReplacingOccurrencesOfString:@":"
                                                          withString:@"-"];
   filteredName = [filteredName stringByReplacingOccurrencesOfString:@"?"
                                                          withString:@"-"];
+  filteredName = [filteredName stringByReplacingOccurrencesOfString:@"."
+      withString:@"-" options:0 range:NSMakeRange(0,1)];

[Scott Hess - ex-Googler, 2015/06/09 20:37:29]

http://google-styleguide.googlecode.com/svn/trunk/objcguide.xml?showone=Metho...

Unfortunately, the combo of super-long method signature and Chromium's 80-column
limit makes this one sad.  I think you can line all the colons up if you put a
line break between the = and the [, even with the resulting 4-space indent.

 
   if ([filteredName length] > kMaxNameLength)
     filteredName = [filteredName substringToIndex:kMaxNameLength];
 
   NSString* candidateName = [filteredName stringByAppendingString:extension];
 
   while (FileAlreadyExists(saveLocation, candidateName)) {
     if (number > kMaxIndex)
       return nil;
     else
@@ skipping 109 matching lines @@
       focusEvent_.reset([event retain]);
       return;
     }
   }
 
   // Handle event immediately.
   [self focusNotificationFor:event ofView:controlView];
 }
 
 @end