diff --git a/git.c b/git.c
index 239b26adfd..c5de8d3a12 100644
--- a/git.c
+++ b/git.c
@@ -286,6 +286,10 @@ static int cmd_log_wc(int argc, const char **argv, char **envp,
 	const char *commit_prefix = "commit ";
 	int shown = 0;
 
+	rev->abbrev = DEFAULT_ABBREV;
+	rev->commit_format = CMIT_FMT_DEFAULT;
+	argc = setup_revisions(argc, argv, rev, "HEAD");
+
 	if (argc > 1)
 		die("unrecognized argument: %s", argv[1]);
 	if (rev->commit_format == CMIT_FMT_ONELINE)
@@ -294,16 +298,20 @@ static int cmd_log_wc(int argc, const char **argv, char **envp,
 	prepare_revision_walk(rev);
 	setup_pager();
 	while ((commit = get_revision(rev)) != NULL) {
+		unsigned long ofs = 0;
+
 		if (shown && rev->diff &&
 		    rev->commit_format != CMIT_FMT_ONELINE)
 			putchar('\n');
-		fputs(commit_prefix, stdout);
+
+		ofs = sprintf(buf, "%s", commit_prefix);
 		if (rev->abbrev_commit && rev->abbrev)
-			fputs(find_unique_abbrev(commit->object.sha1,
-						 rev->abbrev),
-			      stdout);
+			ofs += sprintf(buf + ofs, "%s",
+				       find_unique_abbrev(commit->object.sha1,
+							  rev->abbrev));
 		else
-			fputs(sha1_to_hex(commit->object.sha1), stdout);
+			ofs += sprintf(buf + ofs, "%s",
+				       sha1_to_hex(commit->object.sha1));
 		if (rev->parents) {
 			struct commit_list *parents = commit->parents;
 			while (parents) {
@@ -311,7 +319,8 @@ static int cmd_log_wc(int argc, const char **argv, char **envp,
 				parents = parents->next;
 				if (o->flags & TMP_MARK)
 					continue;
-				printf(" %s", sha1_to_hex(o->sha1));
+				ofs += sprintf(buf + ofs, " %s",
+					       sha1_to_hex(o->sha1));
 				o->flags |= TMP_MARK;
 			}
 			/* TMP_MARK is a general purpose flag that can
@@ -323,17 +332,20 @@ static int cmd_log_wc(int argc, const char **argv, char **envp,
 			     parents = parents->next)
 				parents->item->object.flags &= ~TMP_MARK;
 		}
-		if (rev->commit_format == CMIT_FMT_ONELINE)
-			putchar(' ');
-		else
-			putchar('\n');
-		pretty_print_commit(rev->commit_format, commit, ~0, buf,
-				    LOGSIZE, rev->abbrev);
-		printf("%s\n", buf);
+		buf[ofs++] = 
+			(rev->commit_format == CMIT_FMT_ONELINE) ? ' ' : '\n';
+		ofs += pretty_print_commit(rev->commit_format, commit, ~0,
+					   buf + ofs,
+					   LOGSIZE - ofs - 20,
+					   rev->abbrev);
+
 		if (rev->diff) {
-			printf("--\n");
+			rev->use_precomputed_header = buf;
+			strcpy(buf + ofs, "\n---\n");
 			log_tree_commit(rev, commit);
 		}
+		else
+			printf("%s\n", buf);
 		shown = 1;
 		free(commit->buffer);
 		commit->buffer = NULL;
@@ -347,12 +359,8 @@ static int cmd_wc(int argc, const char **argv, char **envp)
 	struct rev_info rev;
 
 	init_revisions(&rev);
-	rev.abbrev = DEFAULT_ABBREV;
-	rev.no_commit_id = 1;
-	rev.commit_format = CMIT_FMT_DEFAULT;
 	rev.diff = 1;
 	rev.diffopt.recursive = 1;
-	argc = setup_revisions(argc, argv, &rev, "HEAD");
 	return cmd_log_wc(argc, argv, envp, &rev);
 }
 
@@ -362,14 +370,11 @@ static int cmd_show(int argc, const char **argv, char **envp)
 
 	init_revisions(&rev);
 	rev.diff = 1;
-	rev.ignore_merges = 0;
+	rev.diffopt.recursive = 1;
 	rev.combine_merges = 1;
 	rev.dense_combined_merges = 1;
-	rev.abbrev = DEFAULT_ABBREV;
-	rev.commit_format = CMIT_FMT_DEFAULT;
-	rev.diffopt.recursive = 1;
+	rev.ignore_merges = 0;
 	rev.no_walk = 1;
-	argc = setup_revisions(argc, argv, &rev, "HEAD");
 	return cmd_log_wc(argc, argv, envp, &rev);
 }
 
@@ -378,10 +383,10 @@ static int cmd_log(int argc, const char **argv, char **envp)
 	struct rev_info rev;
 
 	init_revisions(&rev);
-	rev.abbrev = DEFAULT_ABBREV;
-	rev.no_commit_id = 1;
-	rev.commit_format = CMIT_FMT_DEFAULT;
-	argc = setup_revisions(argc, argv, &rev, "HEAD");
+	rev.always_show_header = 1;
+	rev.diffopt.recursive = 1;
+	rev.combine_merges = 1;
+	rev.ignore_merges = 0;
 	return cmd_log_wc(argc, argv, envp, &rev);
 }
 
diff --git a/log-tree.c b/log-tree.c
index 04a68e0f57..7d9f41ede1 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -54,6 +54,9 @@ static const char *generate_header(struct rev_info *opt,
 	int abbrev = opt->diffopt.abbrev;
 	const char *msg = commit->buffer;
 
+	if (opt->use_precomputed_header)
+		return opt->use_precomputed_header;
+
 	if (!opt->verbose_header)
 		return sha1_to_hex(commit_sha1);
 
diff --git a/revision.h b/revision.h
index 7b854866b2..74dc5ef179 100644
--- a/revision.h
+++ b/revision.h
@@ -56,6 +56,7 @@ struct rev_info {
 	enum cmit_fmt	commit_format;
 	const char	*header_prefix;
 	const char	*header;
+	const char	*use_precomputed_header;
 
 	/* special limits */
 	int max_count;