[PATCH 2/4] scripts: sphinx-pre-install: add a helper subroutine

[Sai Vishnu M <saivishnu725@gmail.com>]

From: Sai Vishnu M <saivishnu725@gmail.com>

Implement run_if_interactive subroutine to prompt for command execution.
The script crashes if the command fails to execute properly.

Signed-off-by: Sai Vishnu M <saivishnu725@gmail.com>
---
Patch series history:
1 -> implement the --interactive flag

 scripts/sphinx-pre-install | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 6e6e5bda6186..16eb739fd633 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -339,6 +339,22 @@ sub which($)
 	return undef;
 }
 
+sub run_if_interactive($)
+{
+	my $command = shift;
+	printf("\n\t$command\n");
+
+	if ($interactive) {
+		printf("Run the command now? [Y/n]: ");
+		my $user_input = <STDIN>;
+		chomp $user_input;
+		if ($user_input eq '' or $user_input =~ /^y(es)?$/i) {
+			system($command) == 0
+				or die "Failed to run the command";
+		}
+	}
+}
+
 #
 # Subroutines that check distro-specific hints
 #
-- 
2.49.0