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# Description Close: #9673 Close: #8277 Close: #10944 This pr introduces the following syntax: 1. `e>|`, pipe stderr to next command. Example: `$env.FOO=bar nu --testbin echo_env_stderr FOO e>| str length` 2. `o+e>|` and `e+o>|`, pipe both stdout and stderr to next command, example: `$env.FOO=bar nu --testbin echo_env_mixed out-err FOO FOO e+o>| str length` Note: it only works for external commands. ~There is no different for internal commands, that is, the following three commands do the same things:~ Edit: it raises errors if we want to pipes for internal commands ``` ❯ ls e>| str length Error: × `e>|` only works with external streams ╭─[entry #1:1:1] 1 │ ls e>| str length · ─┬─ · ╰── `e>|` only works on external streams ╰──── ❯ ls e+o>| str length Error: × `o+e>|` only works with external streams ╭─[entry #2:1:1] 1 │ ls e+o>| str length · ──┬── · ╰── `o+e>|` only works on external streams ╰──── ``` This can help us to avoid some strange issues like the following: `$env.FOO=bar (nu --testbin echo_env_stderr FOO) e>| str length` Which is hard to understand and hard to explain to users. # User-Facing Changes Nan # Tests + Formatting To be done # After Submitting Maybe update documentation about these syntax.
92 lines
2.1 KiB
Rust
92 lines
2.1 KiB
Rust
use nu_test_support::nu;
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#[test]
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fn let_name_builtin_var() {
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let actual = nu!("let in = 3");
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assert!(actual
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.err
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.contains("'in' is the name of a builtin Nushell variable"));
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}
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#[test]
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fn let_doesnt_mutate() {
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let actual = nu!("let i = 3; $i = 4");
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assert!(actual.err.contains("immutable"));
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}
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#[test]
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fn let_takes_pipeline() {
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let actual = nu!(r#"let x = "hello world" | str length; print $x"#);
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assert_eq!(actual.out, "11");
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}
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#[test]
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fn let_pipeline_allows_in() {
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let actual =
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nu!(r#"def foo [] { let x = $in | str length; print ($x + 10) }; "hello world" | foo"#);
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assert_eq!(actual.out, "21");
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}
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#[test]
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fn mut_takes_pipeline() {
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let actual = nu!(r#"mut x = "hello world" | str length; print $x"#);
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assert_eq!(actual.out, "11");
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}
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#[test]
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fn mut_pipeline_allows_in() {
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let actual =
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nu!(r#"def foo [] { mut x = $in | str length; print ($x + 10) }; "hello world" | foo"#);
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assert_eq!(actual.out, "21");
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}
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#[test]
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fn let_pipeline_redirects_internals() {
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let actual = nu!(r#"let x = echo 'bar'; $x | str length"#);
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assert_eq!(actual.out, "3");
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}
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#[test]
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fn let_pipeline_redirects_externals() {
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let actual = nu!(r#"let x = nu --testbin cococo 'bar'; $x | str length"#);
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assert_eq!(actual.out, "3");
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}
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#[test]
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fn let_err_pipeline_redirects_externals() {
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let actual = nu!(
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r#"let x = with-env [FOO "foo"] {nu --testbin echo_env_stderr FOO e>| str length}; $x"#
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);
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// have an extra \n, so length is 4.
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assert_eq!(actual.out, "4");
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}
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#[test]
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fn let_outerr_pipeline_redirects_externals() {
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let actual = nu!(
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r#"let x = with-env [FOO "foo"] {nu --testbin echo_env_stderr FOO o+e>| str length}; $x"#
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);
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// have an extra \n, so length is 4.
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assert_eq!(actual.out, "4");
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}
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#[ignore]
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#[test]
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fn let_with_external_failed() {
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// FIXME: this test hasn't run successfully for a long time. We should
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// bring it back to life at some point.
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let actual = nu!(r#"let x = nu --testbin outcome_err "aa"; echo fail"#);
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assert!(!actual.out.contains("fail"));
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}
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