Split init_revisions() out of setup_revisions()

Merging all three option parsers related to whatchanged is
unarguably the right thing, but the fallout was too big to scare
me away.  Let's try it once again, but once step at time.

This splits out init_revisions() call from setup_revisions(), so
that the callers can set different defaults to match the
traditional benaviour.

The rev-list command is still broken in a big way, which is the
topic of next step.

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

commit.h

@@ -45,6 +45,8 @@ enum cmit_fmt {
 	CMIT_FMT_FULL,
 	CMIT_FMT_FULLER,
 	CMIT_FMT_ONELINE,
+
+	CMIT_FMT_UNSPECIFIED,
 };
 
 extern enum cmit_fmt get_commit_format(const char *arg);

diff-tree.c

@@ -69,6 +69,7 @@ int main(int argc, const char **argv)
 
 	git_config(git_diff_config);
 	nr_sha1 = 0;
+	init_revisions(opt);
 	opt->abbrev = 0;
 	argc = setup_revisions(argc, argv, opt, NULL);
 

git.c

@@ -286,6 +286,7 @@ static int cmd_log(int argc, const char **argv, char **envp)
 	const char *commit_prefix = "commit ";
 	int shown = 0;
 
+	init_revisions(&rev);
 	rev.abbrev = DEFAULT_ABBREV;
 	argc = setup_revisions(argc, argv, &rev, "HEAD");
 	if (argc > 1)

http-push.c

@@ -2498,6 +2498,7 @@ int main(int argc, char **argv)
 			commit_argv[3] = old_sha1_hex;
 			commit_argc++;
 		}
+		init_revisions(&revs);
 		setup_revisions(commit_argc, commit_argv, &revs, NULL);
 		free(new_sha1_hex);
 		if (old_sha1_hex) {

revision.c

@@ -475,11 +475,9 @@ static void handle_all(struct rev_info *revs, unsigned flags)
 
 void init_revisions(struct rev_info *revs)
 {
-	unsigned abbrev = revs->abbrev;
-
 	memset(revs, 0, sizeof(*revs));
 
-	revs->abbrev = abbrev;
+	revs->abbrev = DEFAULT_ABBREV;
 	revs->ignore_merges = 1;
 	revs->pruning.recursive = 1;
 	revs->pruning.add_remove = file_add_remove;
@@ -516,8 +514,6 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 	const char **unrecognized = argv + 1;
 	int left = 1;
 
-	init_revisions(revs);
-
 	/* First, search for "--" */
 	seen_dashdash = 0;
 	for (i = 1; i < argc; i++) {