[PATCH 2/4] Move finding bisection into do_find_bisection.

[PATCH 2/4] Move finding bisection into do_find_bisection.

[Christian Couder]

This factorises some code and make a big function smaller.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin-rev-list.c |   40 +++++++++++++++++++++++++---------------
 1 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 5bcafe4..4e2524a 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -255,6 +255,9 @@ static void show_list(const char *debug, int counted, int nr,
 }
 #endif /* DEBUG_BISECT */
 
+static struct commit_list *do_find_bisection(struct commit_list *list,
+					     int nr, int *weights);
+
 /*
  * zero or positive weight is the number of interesting commits it can
  * reach, including itself.  Especially, weight = 0 means it does not
@@ -272,7 +275,7 @@ static void show_list(const char *debug, int counted, int nr,
 static struct commit_list *find_bisection(struct commit_list *list,
 					  int *reaches, int *all)
 {
-	int n, nr, on_list, counted, distance;
+	int nr, on_list;
 	struct commit_list *p, *best, *next, *last;
 	int *weights;
 
@@ -301,6 +304,25 @@ static struct commit_list *find_bisection(struct commit_list *list,
 
 	*all = nr;
 	weights = xcalloc(on_list, sizeof(int));
+
+	/* Do the real work of finding bisection commit. */
+	best = do_find_bisection(list, nr, weights);
+
+	if (best)
+		best->next = NULL;
+
+	*reaches = weight(best);
+	free(weights);
+
+	return best;
+}
+
+static struct commit_list *do_find_bisection(struct commit_list *list,
+					     int nr, int *weights)
+{
+	int n, counted, distance;
+	struct commit_list *p, *best;
+
 	counted = 0;
 
 	for (n = 0, p = list; p; p = p->next) {
@@ -357,12 +379,8 @@ static struct commit_list *find_bisection(struct commit_list *list,
 		weight_set(p, distance);
 
 		/* Does it happen to be at exactly half-way? */
-		if (halfway(p, distance, nr)) {
-			p->next = NULL;
-			*reaches = distance;
-			free(weights);
+		if (halfway(p, distance, nr))
 			return p;
-		}
 		counted++;
 	}
 
@@ -400,12 +418,8 @@ static struct commit_list *find_bisection(struct commit_list *list,
 
 			/* Does it happen to be at exactly half-way? */
 			distance = weight(p);
-			if (halfway(p, distance, nr)) {
-				p->next = NULL;
-				*reaches = distance;
-				free(weights);
+			if (halfway(p, distance, nr))
 				return p;
-			}
 		}
 	}
 
@@ -425,12 +439,8 @@ static struct commit_list *find_bisection(struct commit_list *list,
 		if (distance > counted) {
 			best = p;
 			counted = distance;
-			*reaches = weight(p);
 		}
 	}
-	if (best)
-		best->next = NULL;
-	free(weights);
 	return best;
 }
 
-- 
1.5.2.1.144.gabc40

[PATCH 3/4] Move some bisection code into best_bisection.

[Christian Couder]

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin-rev-list.c |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 4e2524a..e5e8011 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -258,6 +258,8 @@ static void show_list(const char *debug, int counted, int nr,
 static struct commit_list *do_find_bisection(struct commit_list *list,
 					     int nr, int *weights);
 
+static struct commit_list *best_bisection(struct commit_list *list, int nr);
+
 /*
  * zero or positive weight is the number of interesting commits it can
  * reach, including itself.  Especially, weight = 0 means it does not
@@ -321,7 +323,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
 					     int nr, int *weights)
 {
 	int n, counted, distance;
-	struct commit_list *p, *best;
+	struct commit_list *p;
 
 	counted = 0;
 
@@ -426,9 +428,17 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
 	show_list("bisection 2 counted all", counted, nr, list);
 
 	/* Then find the best one */
-	counted = -1;
+	return best_bisection(list, nr);
+}
+
+static struct commit_list *best_bisection(struct commit_list *list, int nr)
+{
+	struct commit_list *p, *best;
+	int best_distance = -1;
+
 	best = list;
 	for (p = list; p; p = p->next) {
+		int distance;
 		unsigned flags = p->item->object.flags;
 
 		if (revs.prune_fn && !(flags & TREECHANGE))
@@ -436,11 +446,12 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
 		distance = weight(p);
 		if (nr - distance < distance)
 			distance = nr - distance;
-		if (distance > counted) {
+		if (distance > best_distance) {
 			best = p;
-			counted = distance;
+			best_distance = distance;
 		}
 	}
+
 	return best;
 }
 
-- 
1.5.2.1.144.gabc40

[PATCH 4/4] Bisection "distance" clean up.

[Christian Couder]

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin-rev-list.c |   18 +++++++-----------
 1 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index e5e8011..38d7069 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -189,7 +189,7 @@ static int count_interesting_parents(struct commit *commit)
 	return count;
 }
 
-static inline int halfway(struct commit_list *p, int distance, int nr)
+static inline int halfway(struct commit_list *p, int nr)
 {
 	/*
 	 * Don't short-cut something we are not going to return!
@@ -202,8 +202,7 @@ static inline int halfway(struct commit_list *p, int distance, int nr)
 	 * 2 and 3 are halfway of 5.
 	 * 3 is halfway of 6 but 2 and 4 are not.
 	 */
-	distance *= 2;
-	switch (distance - nr) {
+	switch (2 * weight(p) - nr) {
 	case -1: case 0: case 1:
 		return 1;
 	default:
@@ -322,7 +321,7 @@ static struct commit_list *find_bisection(struct commit_list *list,
 static struct commit_list *do_find_bisection(struct commit_list *list,
 					     int nr, int *weights)
 {
-	int n, counted, distance;
+	int n, counted;
 	struct commit_list *p;
 
 	counted = 0;
@@ -373,15 +372,13 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
 	for (p = list; p; p = p->next) {
 		if (p->item->object.flags & UNINTERESTING)
 			continue;
-		n = weight(p);
-		if (n != -2)
+		if (weight(p) != -2)
 			continue;
-		distance = count_distance(p);
+		weight_set(p, count_distance(p));
 		clear_distance(list);
-		weight_set(p, distance);
 
 		/* Does it happen to be at exactly half-way? */
-		if (halfway(p, distance, nr))
+		if (halfway(p, nr))
 			return p;
 		counted++;
 	}
@@ -419,8 +416,7 @@ static struct commit_list *do_find_bisection(struct commit_list *list,
 				weight_set(p, weight(q));
 
 			/* Does it happen to be at exactly half-way? */
-			distance = weight(p);
-			if (halfway(p, distance, nr))
+			if (halfway(p, nr))
 				return p;
 		}
 	}
-- 
1.5.2.1.144.gabc40