Make git-send-email detect mbox-style patches more readily

Earlier we insisted that mbox file to begin with "From ".  That
is fine as long as you feed format-patch output, but if you
handcraft the input file, this is unnecessary burden.  We should
detect lines that look like e-mail headers and say that is also
a mbox file.

The other input file format is traditional "send lots of email",
whose first line would never look like e-mail headers, so this
is a safe change.

The original patch was done by Matthew Wilcox, which checked
explicitly for headers the script pays attention to.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-send-email.perl b/git-send-email.perl
index 21b3686b2c94740fac030624dc2eefeda82617da..eb91270898fe3e961cea626e5e43be85a08ba51d 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -481,15 +481,21 @@ foreach my $t (@files) {
        my $author_not_sender = undef;
        @cc = @initial_cc;
        @xh = ();
-       my $found_mbox = 0;
+       my $input_format = undef;
        my $header_done = 0;
        $message = "";
        while(<F>) {
                if (!$header_done) {
-                       $found_mbox = 1, next if (/^From /);
+                       if (/^From /) {
+                               $input_format = 'mbox';
+                               next;
+                       }
                        chomp;
+                       if (!defined $input_format && /^[-A-Za-z]+:\s/) {
+                               $input_format = 'mbox';
+                       }
 
-                       if ($found_mbox) {
+                       if (defined $input_format && $input_format eq 'mbox') {
                                if (/^Subject:\s+(.*)$/) {
                                        $subject = $1;
 
@@ -514,6 +520,7 @@ foreach my $t (@files) {
                                # line 1 = cc
                                # line 2 = subject
                                # So let's support that, too.
+                               $input_format = 'lots';
                                if (@cc == 0) {
                                        printf("(non-mbox) Adding cc: %s from line '%s'\n",
                                                $_, $_) unless $quiet;