handle case_sensitive=False when completing choices

Co-authored-by: David Lord <davidism@gmail.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/src/click/types.py b/src/click/types.py
index 8c886d6..626287d 100644
--- a/src/click/types.py
+++ b/src/click/types.py
@@ -274,7 +274,14 @@ class Choice(ParamType):
         from click.shell_completion import CompletionItem
 
         str_choices = map(str, self.choices)
-        return [CompletionItem(c) for c in str_choices if c.startswith(incomplete)]
+
+        if self.case_sensitive:
+            matched = (c for c in str_choices if c.startswith(incomplete))
+        else:
+            incomplete = incomplete.lower()
+            matched = (c for c in str_choices if c.lower().startswith(incomplete))
+
+        return [CompletionItem(c) for c in matched]
 
 
 class DateTime(ParamType):