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version 2.109.1

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Function std.path.asRelativePath

Transforms path into a path relative to base.

auto asRelativePath(CaseSensitive cs = CaseSensitive.osDefault, R1, R2) (
  R1 path,
  R2 base
)
if ((isNarrowString!R1 || isRandomAccessRange!R1 && hasSlicing!R1 && isSomeChar!(ElementType!R1) && !isConvertibleToString!R1) && (isNarrowString!R2 || isRandomAccessRange!R2 && hasSlicing!R2 && isSomeChar!(ElementType!R2) && !isConvertibleToString!R2));

The returned path is relative to base, which is usually the current working directory. base must be an absolute path, and it is always assumed to refer to a directory. If path and base refer to the same directory, the function returns '.'.

The following algorithm is used:

  1. If path is a relative directory, return it unaltered.
  2. Find a common root between path and base. If there is no common root, return path unaltered.
  3. Prepare a string with as many ../ or ..\ as necessary to reach the common root from base path.
  4. Append the remaining segments of path to the string and return.

In the second step, path components are compared using filenameCmp!cs, where cs is an optional template parameter determining whether the comparison is case sensitive or not. See the filenameCmp documentation for details.

Parameters

NameDescription
path path to transform
base absolute path
cs whether filespec comparisons are sensitive or not; defaults to CaseSensitive.osDefault

Returns

a random access range of the transformed path

See Also

relativePath

Example

import std.array;
version (Posix)
{
    writeln(asRelativePath("foo", "/bar").array); // "foo"
    writeln(asRelativePath("/foo/bar", "/foo/bar").array); // "."
    writeln(asRelativePath("/foo/bar", "/foo/baz").array); // "../bar"
    writeln(asRelativePath("/foo/bar/baz", "/foo/woo/wee").array); // "../../bar/baz"
    writeln(asRelativePath("/foo/bar/baz", "/foo/bar").array); // "baz"
}
else version (Windows)
{
    writeln(asRelativePath("foo", `c:\bar`).array); // "foo"
    writeln(asRelativePath(`c:\foo\bar`, `c:\foo\bar`).array); // "."
    writeln(asRelativePath(`c:\foo\bar`, `c:\foo\baz`).array); // `..\bar`
    writeln(asRelativePath(`c:\foo\bar\baz`, `c:\foo\woo\wee`).array); // `..\..\bar\baz`
    writeln(asRelativePath(`c:/foo/bar/baz`, `c:\foo\woo\wee`).array); // `..\..\bar\baz`
    writeln(asRelativePath(`c:\foo\bar\baz`, `c:\foo\bar`).array); // "baz"
    writeln(asRelativePath(`c:\foo\bar`, `d:\foo`).array); // `c:\foo\bar`
    writeln(asRelativePath(`\\foo\bar`, `c:\foo`).array); // `\\foo\bar`
}
else
    static assert(0);

Authors

Lars Tandle Kyllingstad, Walter Bright, Grzegorz Adam Hankiewicz, Thomas Kühne, Andrei Alexandrescu

License

Boost License 1.0