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SubjectRe: [PATCH] checkpatch: use patch subject when reading from stdin
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On Tue, 2019-10-08 at 17:28 +0200, Geert Uytterhoeven wrote:
> Hi Joe,
>
> On Tue, Oct 8, 2019 at 5:20 PM Joe Perches <joe@perches.com> wrote:
> > On Tue, 2019-10-08 at 11:40 +0200, Geert Uytterhoeven wrote:
> > > When reading a patch file from standard input, checkpatch calls it "Your
> > > patch", and reports its state as:
> > >
> > > Your patch has style problems, please review.
> > >
> > > or:
> > >
> > > Your patch has no obvious style problems and is ready for submission.
> > >
> > > Hence when checking multiple patches by piping them to checkpatch, e.g.
> > > when checking patchwork bundles using:
> > >
> > > formail -s scripts/checkpatch.pl < bundle-foo.mbox
> > >
> > > it is difficult to identify which patches need to be reviewed and
> > > improved.
> > >
> > > Fix this by replacing "Your patch" by the patch subject, if present.
> > []
> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > []
> > > @@ -1047,6 +1047,10 @@ for my $filename (@ARGV) {
> > > }
> > > while (<$FILE>) {
> > > chomp;
> > > + if ($vname eq 'Your patch') {
> > > + my ($subject) = $_ =~ /^Subject:\s*(.*)/;
> > > + $vname = '"' . $subject . '"' if $subject;
> >
> > Hi again Geert.
> >
> > Just some stylistic nits:
> >
> > $filename is not quoted so I think adding quotes
> > before and after $subject may not be useful.
>
> Filename is indeed not quoted, but $git_commits{$filename} is.

If I understand your use case, this will only show the last
patch $subject of a bundle?

Also, it'll show things like "duplicate signature" when multiple
patches are tested in a single bundle.

For instance, if I have a git format-patch series in an output
directory and do

$ cat <output_dir>/*.patch | ./scripts/checkpatch.pl

Bad output happen.

Maybe this might be better:

---
scripts/checkpatch.pl | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index cf7543a9d1b2..2f79c585e795 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2444,6 +2444,15 @@ sub process {

my $rawline = $rawlines[$linenr - 1];

+# if input from stdin, report the subject lines if they exist
+ if ($filename eq '-' && !$quiet &&
+ $rawline =~ /^Subject:\s*(.*)/) {
+ report("stdin", "STDIN", '-' x length($1));
+ report("stdin", "STDIN", $1);
+ report("stdin", "STDIN", '-' x length($1));
+ %signatures = (); # avoid duplicate signatures
+ }
+
# check if it's a mode change, rename or start of a patch
if (!$in_commit_log &&
($line =~ /^ mode change [0-7]+ => [0-7]+ \S+\s*$/ ||
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