standalone message retrieval unless - given

diff --git a/git-grep-footer b/git-grep-footer
index 0a3450ecd9484daaafbffca458201f175938d037..a868319653246030ea7f83e7540b0e78a7ee2e48 100755 (executable)
--- a/git-grep-footer
+++ b/git-grep-footer
@@ -9,6 +9,7 @@ use Getopt::Long qw(:config bundling);
 
 GetOptions(\my %opt,
        'debug!',
+       '',  # stdin
        'count|c!',
        'simplify|s:s',
        'ignore-case|i!',
@@ -21,6 +22,11 @@ GetOptions(\my %opt,
        'help|man|?' => sub { Getopt::Long::HelpMessage(-verbose => 2) },
 ) or exit 129;
 
+my $inputstream = $opt{''} ? \*ARGV : eval {
+       require Git;
+       Git::command_output_pipe('log', '-z', '--pretty=format:%b', @ARGV);
+} || die "Automatic git log failed: $@";
+
 local $| = 1;
 local $/ = "\0";
 
@@ -28,7 +34,7 @@ my $HEADERMATCH = qr/ [a-z]+ (?: (?:-\w+)+ | \ by ) | cc | reference /ix;
 
 my (%headercount, @headercache);
 
-while (readline) {
+while (readline $inputstream) {
        s/^([0-9a-f]{4,40})\n//m and
        my $hash = $1;
 
@@ -159,7 +165,9 @@ git-grep-footer - Find custom header lines in commit messages
 
 =head1 SYNOPSIS
 
-F<git> log --pretty=%b%x00 | F<git-grep-footer> [OPTIONS]
+F<git-grep-footer> [OPTIONS] [-- <git log options>]
+
+F<git> log -z --pretty=format:%b | F<git-grep-footer> [OPTIONS] -
 
 =head1 DESCRIPTION
 
@@ -232,9 +240,9 @@ Causes output to be buffered until all input has been read (obviously).
 
 =over
 
-=item git-grep-footer --grep=^ack
+=item git-grep-footer --grep=^ack v2.6.32..v2.6.33
 
-Search for Acked-by lines.
+Search for I<Acked-by> lines for version I<v2.6.33>.
 Append C<-uin> to skip reoccurrences.
 
 =item git-grep-footer -u --grep=junio
@@ -249,9 +257,9 @@ Compare various capitalisations and (mis)spellings of signoffs.
 
 List the ten most frequently used attribute names.
 
-=item git-grep-footer -n2 -i -s
+=item git-grep-footer -n2 -i -s -- --reverse
 
-Upto two examples for each distinct identifier.
+The earliest two usages of each distinct identifier.
 
 =back