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differentiating between --x
and --x: bool
(#10456)
# Description Fixes: #10450 This pr differentiating between `--x: bool` and `--x` Here are examples which demostrate difference between them: ```nushell def a [--x: bool] { $x }; a --x # not allowed, you need to parse a value to the flag. a # it's allowed, and the value of `$x` is false, which behaves the same to `def a [--x] { $x }; a` ``` For boolean flag with default value, it works a little bit different to #10450 mentioned: ```nushell def foo [--option: bool = false] { $option } foo # output false foo --option # not allowed, you need to parse a value to the flag. foo --option true # output true ``` # User-Facing Changes After the pr, the following code is not allowed: ```nushell def a [--x: bool] { $x }; a --x ``` Instead, you have to pass a value to flag `--x` like `a --x false`. But bare flag works in the same way as before. ## Update: one more breaking change to help on #7260 ``` def foo [--option: bool] { $option == null } foo ``` After the pr, if we don't use a boolean flag, the value will be `null` instead of `true`. Because here `--option: bool` is treated as a flag rather than a switch --------- Co-authored-by: amtoine <stevan.antoine@gmail.com>
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@ -180,3 +180,16 @@ fn def_default_value_should_restrict_implicit_type() {
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let actual2 = nu!("def foo2 [--x = 3] { $x }; foo2 --x 3.0");
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assert!(actual2.err.contains("expected int"));
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}
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#[test]
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fn def_boolean_flags() {
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let actual = nu!("def foo [--x: bool] { $x }; foo --x");
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assert!(actual.err.contains("flag missing bool argument"));
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let actual = nu!("def foo [--x: bool = false] { $x }; foo");
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assert_eq!(actual.out, "false");
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let actual = nu!("def foo [--x: bool = false] { $x }; foo --x");
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assert!(actual.err.contains("flag missing bool argument"));
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// boolean flags' default value should be null
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let actual = nu!("def foo [--x: bool] { $x == null }; foo");
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assert_eq!(actual.out, "true");
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}
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