vis: add workaround for broken color handling in Terminal.app

Terminal.app sets $TERM=xterm-256color and ships a corresponding
terminfo description advocating that it is capable of color changes
to the 256 color palette when in fact it can not.

We introduce a new boolean option "change-256colors" which is
true by default but can be used to disable color changes. It is
automatically set if Terminal.app is detected using $TERM_PROGRAM.

This should fix display artifacts as described in #456.

1 files changed, 1 insertions, 0 deletions

diff --git a/vis.c b/vis.c
index 790069a..e0b2c1e 100644
--- a/vis.c
+++ b/vis.c
@@ -532,6 +532,7 @@ Vis *vis_new(Ui *ui, VisEvent *event) {
 	vis->ui = ui;
 	vis->tabwidth = 8;
 	vis->expandtab = false;
+	vis->change_colors = true;
 	vis->registers[VIS_REG_BLACKHOLE].type = REGISTER_BLACKHOLE;
 	vis->registers[VIS_REG_CLIPBOARD].type = REGISTER_CLIPBOARD;
 	array_init(&vis->motions);