git-rev-list: factor out the commit printing from "main()"

Functions that do many things are bad. We should basically
just parse the arguments in main(). We're not quite there
yet, but it's a step in the right direction.

rev-list.c

diff --git a/rev-list.c b/rev-list.c
index 73b3e97..8775b65 100644
--- a/rev-list.c
+++ b/rev-list.c
@@ -13,6 +13,54 @@
 		      "  --header\n"
 		      "  --pretty";
 
+static int verbose_header = 0;
+static int show_parents = 0;
+static int pretty_print = 0;
+static int hdr_termination = 0;
+static const char *prefix = "";
+static unsigned long max_age = -1;
+static unsigned long min_age = -1;
+static int max_count = -1;
+
+static void show_commit(struct commit *commit)
+{
+	printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
+	if (show_parents) {
+		struct commit_list *parents = commit->parents;
+		while (parents) {
+			printf(" %s", sha1_to_hex(parents->item->object.sha1));
+			parents = parents->next;
+		}
+	}
+	putchar('\n');
+	if (verbose_header) {
+		const char *buf = commit->buffer;
+		if (pretty_print) {
+			static char pretty_header[16384];
+			pretty_print_commit(commit->buffer, ~0, pretty_header, sizeof(pretty_header));
+			buf = pretty_header;
+		}
+		printf("%s%c", buf, hdr_termination);
+	}
+}
+
+static void show_commit_list(struct commit_list *list)
+{
+	while (list) {
+		struct commit *commit = pop_most_recent_commit(&list, SEEN);
+
+		if (commit->object.flags & UNINTERESTING)
+			continue;
+		if (min_age != -1 && (commit->date > min_age))
+			continue;
+		if (max_age != -1 && (commit->date < max_age))
+			break;
+		if (max_count != -1 && !max_count--)
+			break;
+		show_commit(commit);
+	}
+}
+
 static void mark_parents_uninteresting(struct commit *commit)
 {
 	struct commit_list *parents = commit->parents;
@@ -42,12 +90,7 @@
 	unsigned char sha1[2][20];
 	struct commit_list *list = NULL;
 	struct commit *commit, *end;
-	int i, verbose_header = 0, show_parents = 0, pretty_print = 0;
-	int hdr_termination = 0;
-	const char *prefix = "";
-	unsigned long max_age = -1;
-	unsigned long min_age = -1;
-	int max_count = -1;
+	int i;
 
 	nr_sha = 0;
 	for (i = 1 ; i < argc; i++) {
@@ -119,35 +162,6 @@
 		list = newlist;
 	}
 
-	while (list) {
-		struct commit *commit = pop_most_recent_commit(&list, SEEN);
-
-		if (commit->object.flags & UNINTERESTING)
-			continue;
-		if (min_age != -1 && (commit->date > min_age))
-			continue;
-		if (max_age != -1 && (commit->date < max_age))
-			break;
-		if (max_count != -1 && !max_count--)
-			break;
-		printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
-		if (show_parents) {
-			struct commit_list *parents = commit->parents;
-			while (parents) {
-				printf(" %s", sha1_to_hex(parents->item->object.sha1));
-				parents = parents->next;
-			}
-		}
-		putchar('\n');
-		if (verbose_header) {
-			const char *buf = commit->buffer;
-			if (pretty_print) {
-				static char pretty_header[16384];
-				pretty_print_commit(commit->buffer, ~0, pretty_header, sizeof(pretty_header));
-				buf = pretty_header;
-			}
-			printf("%s%c", buf, hdr_termination);
-		}
-	}
+	show_commit_list(list);
 	return 0;
 }