cherry-pick: allow "-" as abbreviation of '@{-1}'

diff --git a/builtin/commit.c b/builtin/commit.c
index d21d07a1a8e9fbc365a4555a0f9e81d0c1f2a7d0..1621dfcd4008fc5853fc078a32bf9eefb6c52023 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -107,7 +107,7 @@ static const char *cleanup_arg;
 
 static enum commit_whence whence;
 static int use_editor = 1, include_status = 1;
-static int show_ignored_in_status;
+static int show_ignored_in_status, have_option_m;
 static const char *only_include_assumed;
 static struct strbuf message = STRBUF_INIT;
 
@@ -121,9 +121,11 @@ static enum {
 static int opt_parse_m(const struct option *opt, const char *arg, int unset)
 {
        struct strbuf *buf = opt->value;
-       if (unset)
+       if (unset) {
+               have_option_m = 0;
                strbuf_setlen(buf, 0);
-       else {
+       } else {
+               have_option_m = 1;
                if (buf->len)
                        strbuf_addch(buf, '\n');
                strbuf_addstr(buf, arg);
@@ -702,7 +704,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                        previous = eol;
                }
 
-               append_signoff(&sb, ignore_footer);
+               append_signoff(&sb, ignore_footer, 0);
        }
 
        if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
@@ -955,7 +957,7 @@ static const char *read_commit_message(const char *name)
        if (!commit)
                die(_("could not lookup commit %s"), name);
        out_enc = get_commit_output_encoding();
-       return logmsg_reencode(commit, out_enc);
+       return logmsg_reencode(commit, NULL, out_enc);
 }
 
 static int parse_and_validate_options(int argc, const char *argv[],
@@ -975,7 +977,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
        if (force_author && renew_authorship)
                die(_("Using both --reset-author and --author does not make sense"));
 
-       if (logfile || message.len || use_message || fixup_message)
+       if (logfile || have_option_m || use_message || fixup_message)
                use_editor = 0;
        if (0 <= edit_flag)
                use_editor = edit_flag;