pretty: pass graph width to pretty formatting for use in '%>|(N)'

Pass graph width to pretty formatting, to make N in '%>|(N)'
include columns consumed by graph rendered when --graph option
is in use.

For example, in the output of

  git log --all --graph --pretty='format: [%>|(20)%h] %ar%d'

this change will make all commit hashes align at 20th column from
the edge of the terminal, not from the edge of the graph.

Signed-off-by: Josef Kufner <josef@kufner.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/graph.h b/graph.h
index 0be62bd..3f48c19 100644
--- a/graph.h
+++ b/graph.h
@@ -68,6 +68,11 @@ int graph_next_line(struct git_graph *graph, struct strbuf *sb);
 
 
 /*
+ * Return current width of the graph in on-screen characters.
+ */
+int graph_width(struct git_graph *graph);
+
+/*
  * graph_show_*: helper functions for printing to stdout
  */