[PATCH] graph: Fix log's graph's colors when merging branches.

[Hemmo Nieminen]

>From bdbefc100ceba66a70f540dfe2b1b09b0869f7ab Mon Sep 17 00:00:00 2001
From: Hemmo Nieminen 
Date: Wed, 16 Oct 2013 11:28:50 +0300
Subject: [PATCH] graph: Fix log's graph's colors when merging branches.

The log's graph's colors were off sometimes when merging several
branches. For example in the graph depicted below, the '-.' part
following the asterisk was colored with incorrect colors. This was
caused by the fact that the leftmost branches, not part of the merge,
were not taken into account when calculating the column numbers
(colors).

  | | Merge of http://members.cox.net/junkio/git-jc.git
  | |
  | *-.   commit 211232bae64bcc60bbf5d1b5e5b2344c22ed767e
  | |\ \ \ \  Merge: fc54a9c 9e30dd7 c4b83e6 6602659 b28858b
  | | | | | | Author: Junio C Hamano 

Signed-off-by: Hemmo Nieminen 
---
 graph.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/graph.c b/graph.c
index b24d04c..6404331 100644
--- a/graph.c
+++ b/graph.c
@@ -801,10 +801,10 @@ static int graph_draw_octopus_merge(struct git_graph *graph,
 	int num_dashes =
 		((graph->num_parents - dashless_commits) * 2) - 1;
 	for (i = 0; i < num_dashes; i++) {
-		col_num = (i / 2) + dashless_commits;
+		col_num = (i / 2) + dashless_commits + graph->commit_index;
 		strbuf_write_column(sb, &graph->new_columns[col_num], '-');
 	}
-	col_num = (i / 2) + dashless_commits;
+	col_num = (i / 2) + dashless_commits + graph->commit_index;
 	strbuf_write_column(sb, &graph->new_columns[col_num], '.');
 	return num_dashes + 1;
 }
-- 
1.8.4.1

Re: [PATCH] graph: Fix log's graph's colors when merging branches.

[Hemmo Nieminen]

Hi,

On 09:13 Thu 17 Oct, John Keeping wrote:
> It took me a minute to spot the problem when I tested this, but you're
> right that there is a bug and I agree that the patch below is the right
> fix.
> 
> Perhaps a better commit message will help others looking at this, maybe
> something like this?

Updated the patch. Attaching it here.


-- 
Best Regards
Hemmo Nieminen

>From 46b7ae56e08bc8ca9c29697da2c1210bd2a242b0 Mon Sep 17 00:00:00 2001
From: Hemmo Nieminen 
Date: Wed, 16 Oct 2013 11:28:50 +0300
Subject: [PATCH v2] graph: fix coloring around octopus merges

When drawing the graph of an octopus merge, we draw a horizontal line
from parents 3 and above into the asterisk representing the commit. The
sections of this line should be colored to match the graph lines coming
in from above.

However, if the commit is not in the left-most column we do not take
into account the columns to the left of the commit when calculating
these colors. Fix this by adding the appropriate offset to the column
index used for calculating the color.

Signed-off-by: Hemmo Nieminen 
---

Notes:
Commit 211232b (Octopus merge of the following five patches.,
2005-05-05) in git.git's history exhibits this problem.

 graph.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/graph.c b/graph.c
index b24d04c..6404331 100644
--- a/graph.c
+++ b/graph.c
@@ -801,10 +801,10 @@ static int graph_draw_octopus_merge(struct git_graph *graph,
 	int num_dashes =
 		((graph->num_parents - dashless_commits) * 2) - 1;
 	for (i = 0; i < num_dashes; i++) {
-		col_num = (i / 2) + dashless_commits;
+		col_num = (i / 2) + dashless_commits + graph->commit_index;
 		strbuf_write_column(sb, &graph->new_columns[col_num], '-');
 	}
-	col_num = (i / 2) + dashless_commits;
+	col_num = (i / 2) + dashless_commits + graph->commit_index;
 	strbuf_write_column(sb, &graph->new_columns[col_num], '.');
 	return num_dashes + 1;
 }
-- 
1.8.4.1