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lib.strings: add trim and trimWith

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`strings.trim` returns a copy of the string with all leading and trailing
whitespace removed.

`strings.trimWith` does the same thing, but calling code can decide
whether to trim the start and/or end of the string.
This commit is contained in:
Matt Sturgeon 2024-05-28 18:22:43 +01:00
parent d1e70dde57
commit aad87c2aa8
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3 changed files with 129 additions and 1 deletions
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66
lib/tests/misc.nix
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@ -369,6 +369,72 @@ runTests {
expected = "hellohellohellohellohello";
};
# Test various strings are trimmed correctly
testTrimString = {
expr =
let
testValues = f: mapAttrs (_: f) {
empty = "";
cr = "\r";
lf = "\n";
tab = "\t";
spaces = " ";
leading = " Hello, world";
trailing = "Hello, world ";
mixed = " Hello, world ";
mixed-tabs = " \t\tHello, world \t \t ";
multiline = " Hello,\n world! ";
multiline-crlf = " Hello,\r\n world! ";
};
in
{
leading = testValues (strings.trimWith { start = true; });
trailing = testValues (strings.trimWith { end = true; });
both = testValues strings.trim;
};
expected = {
leading = {
empty = "";
cr = "";
lf = "";
tab = "";
spaces = "";
leading = "Hello, world";
trailing = "Hello, world ";
mixed = "Hello, world ";
mixed-tabs = "Hello, world \t \t ";
multiline = "Hello,\n world! ";
multiline-crlf = "Hello,\r\n world! ";
};
trailing = {
empty = "";
cr = "";
lf = "";
tab = "";
spaces = "";
leading = " Hello, world";
trailing = "Hello, world";
mixed = " Hello, world";
mixed-tabs = " \t\tHello, world";
multiline = " Hello,\n world!";
multiline-crlf = " Hello,\r\n world!";
};
both = {
empty = "";
cr = "";
lf = "";
tab = "";
spaces = "";
leading = "Hello, world";
trailing = "Hello, world";
mixed = "Hello, world";
mixed-tabs = "Hello, world";
multiline = "Hello,\n world!";
multiline-crlf = "Hello,\r\n world!";
};
};
};
testSplitStringsSimple = {
expr = strings.splitString "." "a.b.c.d";
expected = [ "a" "b" "c" "d" ];