Subject: [PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

From: "Slavica Djukic via GitGitGadget" <[email-masked]>
Date: Thu, 20 Dec 2018 04:09:26 -0800 (PST)

From: Slavica Djukic <[email-masked]>

To enable testing the colored output on Windows, enable TTY
by using environment variable GIT_TEST_PRETEND_TTY.

This is the original idea by Johannes Schindelin.

Signed-off-by: Slavica Djukic <[email-masked]>
---
 color.c     | 4 ++++
 perl/Git.pm | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/color.c b/color.c
index ebb222ec33..4aa6cc3442 100644
--- a/color.c
+++ b/color.c
@@ -323,6 +323,10 @@ static int check_auto_color(int fd)
 {
 	static int color_stderr_is_tty = -1;
 	int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
+	
+	if (git_env_bool("GIT_TEST_PRETEND_TTY", 0))
+		return 1;
+
 	if (*is_tty_p < 0)
 		*is_tty_p = isatty(fd);
 	if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
diff --git a/perl/Git.pm b/perl/Git.pm
index d856930b2e..51a1ce0617 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -757,7 +757,7 @@ and returns boolean (true for "use color", false for "do not use color").
 
 sub get_colorbool {
 	my ($self, $var) = @_;
-	my $stdout_to_tty = (-t STDOUT) ? "true" : "false";
+	my $stdout_to_tty = $ENV{GIT_TEST_PRETEND_TTY} || (-t STDOUT) ? "true" : "false";
 	my $use_color = $self->command_oneline('config', '--get-colorbool',
 					       $var, $stdout_to_tty);
 	return ($use_color eq 'true');
-- 
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