49 lines
1.5 KiB
Text
49 lines
1.5 KiB
Text
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open IO.Process
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def usingIO {α} (x : IO α) : IO α := x
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#eval usingIO do
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let child ← spawn { cmd := "sh", args := #["-c", "exit 1"] };
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child.wait
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#eval usingIO do
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let child ← spawn { cmd := "sh", args := #["-c", "echo hi!"] };
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child.wait
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#eval usingIO do
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let child ← spawn { cmd := "sh", args := #["-c", "echo ho!"], stdout := Stdio.piped };
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child.wait;
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child.stdout.readToEnd
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#eval usingIO do
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let child ← spawn { cmd := "head", args := #["-n1"], stdin := Stdio.piped, stdout := Stdio.piped };
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child.stdin.putStrLn "hu!";
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child.stdin.flush;
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child.wait;
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child.stdout.readToEnd
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#eval usingIO do
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let child ← spawn { cmd := "true", stdin := Stdio.piped };
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child.wait;
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child.stdin.putStrLn "ha!";
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child.stdin.flush <|> IO.println "flush of broken pipe failed"
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#eval usingIO do
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-- produce enough output to fill both pipes on all platforms
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let out ← output { cmd := "sh", args := #["-c", "printf '%100000s' >& 2; printf '%100001s'"] };
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IO.println out.stdout.length;
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IO.println out.stderr.length
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#eval usingIO do
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-- With a non-empty stdin, cat would wait on input forever
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let child ← spawn { cmd := "sh", args := #["-c", "cat"], stdin := Stdio.null };
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child.wait
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#eval usingIO do
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let child ← spawn { cmd := "sh", args := #["-c", "echo nullStdout"], stdout := Stdio.null };
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child.wait
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#eval usingIO do
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let child ← spawn { cmd := "sh", args := #["-c", "echo nullStderr >& 2"], stderr := Stdio.null };
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child.wait
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