From 1276c2d3ebf311a9f48494ae369bc9848b6e0a3a Mon Sep 17 00:00:00 2001
From: Bryan Gardiner <bog@khumba.net>
Date: Sun, 28 May 2023 10:09:14 -0700
Subject: [PATCH] Respect the NO_COLOR environment variable to disable colour.

---
 CHANGELOG.md | 4 ++++
 src/nvd      | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4b2b18..bba5bf4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## 0.2.4 (unreleased)
 
+- Respect the `NO_COLOR` environment variable and disable colour when it is set
+  and nonempty (when the default `--color=auto` is used).  For more info see:
+  https://no-color.org
+
 ## 0.2.3 (2023-05-22)
 
 - Fix compatibility with nix-2.3 where `nix --extra-experimental-features` isn't
diff --git a/src/nvd b/src/nvd
index 916a96e..9a07fd2 100755
--- a/src/nvd
+++ b/src/nvd
@@ -764,7 +764,9 @@ def main():
     args = parse_args()
     action = args.action
     NIX_BIN_DIR = args.nix_bin_dir or None
-    USE_COLOUR = args.color == "always" or (args.color == "auto" and sys.stdout.isatty())
+    USE_COLOUR = \
+        args.color == "always" \
+        or (args.color == "auto" and sys.stdout.isatty() and not os.getenv('NO_COLOR'))
     del args.action
     del args.nix_bin_dir
     del args.color