checkpatch: make the CamelCase cache work for non-git trees too

Might as well check include timestamps and cache the include file
CamelCase uses for the non-git case too.

The camelcase cache file is now named:

  for git:      .checkpatch-camelcase.git.<commit_id>
  for non-git:  .checkpatch-camelcase.date.<YYYYMMDDhhmm>

All .checkpatch-camelcase* files are deleted if not current.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 6afcd12..2ee9eb7 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6,6 +6,7 @@
 # Licensed under the terms of the GNU GPL License version 2
 
 use strict;
+use POSIX;
 
 my $P = $0;
 $P =~ s@.*/@@g;
@@ -399,37 +400,52 @@ sub seed_camelcase_includes {
        return if ($camelcase_seeded);
 
        my $files;
-       my $camelcase_git_file = "";
+       my $camelcase_cache = "";
+       my @include_files = ();
+
+       $camelcase_seeded = 1;
 
        if (-d ".git") {
                my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
                chomp $git_last_include_commit;
-               $camelcase_git_file = ".checkpatch-camelcase.$git_last_include_commit";
-               if (-f $camelcase_git_file) {
-                       open(my $camelcase_file, '<', "$camelcase_git_file")
-                           or warn "$P: Can't read '$camelcase_git_file' $!\n";
-                       while (<$camelcase_file>) {
-                               chomp;
-                               $camelcase{$_} = 1;
-                       }
-                       close($camelcase_file);
-
-                       return;
-               }
-               $files = `git ls-files include`;
+               $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
        } else {
+               my $last_mod_date = 0;
                $files = `find $root/include -name "*.h"`;
+               @include_files = split('\n', $files);
+               foreach my $file (@include_files) {
+                       my $date = POSIX::strftime("%Y%m%d%H%M",
+                                                  localtime((stat $file)[9]));
+                       $last_mod_date = $date if ($last_mod_date < $date);
+               }
+               $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
+       }
+
+       if ($camelcase_cache ne "" && -f $camelcase_cache) {
+               open(my $camelcase_file, '<', "$camelcase_cache")
+                   or warn "$P: Can't read '$camelcase_cache' $!\n";
+               while (<$camelcase_file>) {
+                       chomp;
+                       $camelcase{$_} = 1;
+               }
+               close($camelcase_file);
+
+               return;
+       }
+
+       if (-d ".git") {
+               $files = `git ls-files "include/*.h"`;
+               @include_files = split('\n', $files);
        }
-       my @include_files = split('\n', $files);
+
        foreach my $file (@include_files) {
                seed_camelcase_file($file);
        }
-       $camelcase_seeded = 1;
 
-       if ($camelcase_git_file ne "") {
+       if ($camelcase_cache ne "") {
                unlink glob ".checkpatch-camelcase.*";
-               open(my $camelcase_file, '>', "$camelcase_git_file")
-                   or warn "$P: Can't write '$camelcase_git_file' $!\n";
+               open(my $camelcase_file, '>', "$camelcase_cache")
+                   or warn "$P: Can't write '$camelcase_cache' $!\n";
                foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
                        print $camelcase_file ("$_\n");
                }