refactor "dumb" terminal determination

Move the code to detect "dumb" terminals into a single location. This
avoids duplicating the terminal detection code yet again in a subsequent
commit.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/color.c b/color.c
index 9a9261a..d48dd94 100644
--- a/color.c
+++ b/color.c
@@ -329,8 +329,7 @@ static int check_auto_color(void)
 	if (color_stdout_is_tty < 0)
 		color_stdout_is_tty = isatty(1);
 	if (color_stdout_is_tty || (pager_in_use() && pager_use_color)) {
-		char *term = getenv("TERM");
-		if (term && strcmp(term, "dumb"))
+		if (!is_terminal_dumb())
 			return 1;
 	}
 	return 0;