checkpatch: add --showfile to allow input via pipe to show filenames

Using "git diff | ./scripts/checkpatch -" does not have an
easy mechanism to see the files and lines actually modified.

Add --showfile to see the file and line specified in the diff.

When --showfile is used without --terse, the second line of each
message output is redundant, so it is removed.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Petr Mladek <pmladek@suse.cz>
Cc: Andy Whitcroft <apw@canonical.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 d52293f..46ebc6a 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -25,6 +25,7 @@ my $chk_patch = 1;
 my $tst_only;
 my $emacs = 0;
 my $terse = 0;
+my $showfile = 0;
 my $file = 0;
 my $check = 0;
 my $check_orig = 0;
@@ -66,6 +67,7 @@ Options:
   --patch                    treat FILE as patchfile (default)
   --emacs                    emacs compile window format
   --terse                    one line per report
+  --showfile                 emit diffed file position, not input file position
   -f, --file                 treat FILE as regular source file
   --subjective, --strict     enable more subjective tests
   --types TYPE(,TYPE2...)    show only these comma separated message types
@@ -137,6 +139,7 @@ GetOptions(
        'patch!'        => \$chk_patch,
        'emacs!'        => \$emacs,
        'terse!'        => \$terse,
+       'showfile!'     => \$showfile,
        'f|file!'       => \$file,
        'subjective!'   => \$check,
        'strict!'       => \$check,
@@ -1693,6 +1696,12 @@ sub report {
        }
        $output .= RESET if (-t STDOUT && $color);
        $output .= ' ' . $msg . "\n";
+
+       if ($showfile) {
+               my @lines = split("\n", $output, -1);
+               splice(@lines, 1, 1);
+               $output = join("\n", @lines);
+       }
        $output = (split('\n', $output))[0] . "\n" if ($terse);
 
        push(our @report, $output);
@@ -2119,10 +2128,6 @@ sub process {
 
                my $hunk_line = ($realcnt != 0);
 
-#make up the handle for any error we report on this line
-               $prefix = "$filename:$realline: " if ($emacs && $file);
-               $prefix = "$filename:$linenr: " if ($emacs && !$file);
-
                $here = "#$linenr: " if (!$file);
                $here = "#$realline: " if ($file);
 
@@ -2152,6 +2157,13 @@ sub process {
                        $found_file = 1;
                }
 
+#make up the handle for any error we report on this line
+               if ($showfile) {
+                       $prefix = "$realfile:$realline: "
+               } elsif ($emacs) {
+                       $prefix = "$filename:$linenr: ";
+               }
+
                if ($found_file) {
                        if ($realfile =~ m@^(drivers/net/|net/)@) {
                                $check = 1;
@@ -5606,7 +5618,7 @@ sub process {
                ERROR("NOT_UNIFIED_DIFF",
                      "Does not appear to be a unified-diff format patch\n");
        }
-       if ($is_patch && $chk_signoff && $signoff == 0) {
+       if ($is_patch && $filename ne '-' && $chk_signoff && $signoff == 0) {
                ERROR("MISSING_SIGN_OFF",
                      "Missing Signed-off-by: line(s)\n");
        }