1 files changed, 21 insertions, 0 deletions
diff --git a/vendor/clap-3.2.20/src/util/str_to_bool.rs b/vendor/clap-3.2.20/src/util/str_to_bool.rs
new file mode 100644
index 000000000..1fbdc7531
--- /dev/null
+++ b/vendor/clap-3.2.20/src/util/str_to_bool.rs
@@ -0,0 +1,21 @@
+/// True values are `y`, `yes`, `t`, `true`, `on`, and `1`.
+pub(crate) const TRUE_LITERALS: [&str; 6] = ["y", "yes", "t", "true", "on", "1"];
+
+/// False values are `n`, `no`, `f`, `false`, `off`, and `0`.
+pub(crate) const FALSE_LITERALS: [&str; 6] = ["n", "no", "f", "false", "off", "0"];
+
+/// Converts a string literal representation of truth to true or false.
+///
+/// `false` values are `n`, `no`, `f`, `false`, `off`, and `0` (case insensitive).
+///
+/// Any other value will be considered as `true`.
+pub(crate) fn str_to_bool(val: impl AsRef<str>) -> Option<bool> {
+    let pat: &str = &val.as_ref().to_lowercase();
+    if TRUE_LITERALS.contains(&pat) {
+        Some(true)
+    } else if FALSE_LITERALS.contains(&pat) {
+        Some(false)
+    } else {
+        None
+    }
+}