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+=head1 NAME
+
+lei-rediff - regenerate a diff with different options
+
+=head1 SYNOPSIS
+
+lei rediff [OPTIONS] LOCATION [LOCATION...]
+
+lei rediff [OPTIONS] (--stdin|-)
+
+=head1 DESCRIPTION
+
+Read a message from C<LOCATION> or stdin and regenerate its diff with
+the specified L<git-diff(1)> options.  This is useful if you want to
+change the display of the original patch (e.g., increasing context,
+coloring moved lines differently, or using an external diff viewer).
+
+It relies on the contents of the .git directory of your current
+project working tree.  In other words, it works anywhere
+L<git-am(1)> works.  Otherwise, C<--git-dir=> may be specified
+any number of times to add repositories to build blob data from.
+
+=head1 OPTIONS
+
+In addition to many L<git-diff(1)> options (e.g. C<-W>, C<-w>,
+C<-U $LINES>) the following options are supported:
+
+=over
+
+=item --stdin
+
+Read message from stdin.  This is implicit if no arguments are given
+and stdin is a pipe or regular file.
+
+For users of text editors and pagers capable of piping its
+buffer to arbitrary commands, it is useful to pipe a patch email
+to C<lei rediff> before piping it to L<git-am(1)>.  The output
+of C<lei rediff> is compatible with C<git am> if its input was a
+patch email.
+
+=item --drq[=COUNT]
+
+De-Re-Quote.  De-quotes the input and re-quotes (the output).
+Removes COUNT levels of C<E<gt> > email reply prefixes and
+re-adds them upon regenerating the diff.
+
+This switch is intended as a convenience for running inside a
+pipe-capable text editor when writing replies to a patch email.
+Note: this may over-add C<E<gt> > prefixes if some input lines
+are missing C<E<gt> > prefixes.
+
+COUNT is 1 if unspecified; in other words, C<--drq=1> and
+C<--drq> are equivalent.
+
+It implies L</--quiet> unless L</--verbose> is specified
+since text editors tend to combine stderr with stdout.
+
+=item --dequote-only[=COUNT]
+
+Like L</--drq>, but does not re-add quote prefixes to the output.
+
+This can be useful for feeding a hunk to L<git-apply(1)>
+or L<patch(1)> while writing a reply or further processing
+by another diff viewer.
+
+Unlike L</--drq>, it does NOT imply L</--quiet>.
+
+=item --git-dir=DIR
+
+Specify an additional .git/ directory to scan.  This option may be
+given multiple times.
+
+Default: the output of C<git rev-parse --git-dir>
+
+=item --no-cwd
+
+Do not look in the git repository of the current working directory.
+
+=item -q
+
+=item --quiet
+
+Suppress progress output.
+
+=item -v
+
+=item --verbose
+
+Provide more feedback on stderr.
+
+=back
+
+The options below, described in L<lei-q(1)>, are also supported.
+
+=over
+
+=item --[no-]remote
+
+=item --no-local
+
+=item --no-external
+
+=item --no-import-remote
+
+=item --torsocks=auto|no|yes, --no-torsocks
+
+=item --proxy=PROTOCOL://HOST[:PORT]
+
+=back
+
+=head1 CONTACT
+
+Feedback welcome via plain-text mail to L<mailto:meta@public-inbox.org>
+
+The mail archives are hosted at L<https://public-inbox.org/meta/>
+and L<http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>
+
+=head1 COPYRIGHT
+
+Copyright 2021 all contributors L<mailto:meta@public-inbox.org>
+
+License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>
+
+=head1 SEE ALSO
+
+L<lei-q(1)>, L<lei-blob(1)>, L<lei-p2q(1)>