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Expand Up @@ -9,7 +9,7 @@

# Filesystem

This is a header-only single-file std::filesystem compatible helper library,
This is a header-only single-file `std::filesystem` compatible helper library,
based on the C++17 and C++20 specs, but implemented for C++11, C++14, C++17 or C++20
(tightly following the C++17 standard with very few documented exceptions). It is currently tested on
macOS 10.12/10.14/10.15, Windows 10, Ubuntu 18.04, CentOS 7, CentOS 8, FreeBSD 12
Expand Down Expand Up @@ -87,7 +87,7 @@ Unit tests are currently run with:
The header comes with a set of unit-tests and uses [CMake](https://cmake.org/)
as a build tool and [Catch2](https://github.com/catchorg/Catch2) as test framework.

All tests agains this implementation should succeed, depending on your environment
All tests against this implementation should succeed, depending on your environment
it might be that there are some warnings, e.g. if you have no rights to create
Symlinks on Windows or at least the test thinks so, but these are just informative.

Expand Down Expand Up @@ -128,7 +128,7 @@ source archives can be found [here](https://github.com/gulrak/filesystem/release
### Using it as Single-File-Header

As `ghc::filesystem` is at first a header-only library, it should be enough to copy the header
or the `include/ghc` directory into your project folder oder point your include path to this place and
or the `include/ghc` directory into your project folder or point your include path to this place and
simply include the `filesystem.hpp` header (or `ghc/filesystem.hpp` if you use the subdirectory).

Everything is in the namespace `ghc::filesystem`, so one way to use it only as
Expand All @@ -150,12 +150,12 @@ namespace fs = ghc::filesystem;

**Note that this code uses a two-stage preprocessor condition because Visual Studio 2015
doesn't like the `(<...>)` syntax, even if it could cut evaluation early before. This code also
used the minimum deployment target to detect if std::filesystem really is available on macOS
used the minimum deployment target to detect if `std::filesystem` really is available on macOS
compilation.**

**Note also, this detection now works on MSVC versions prior to 15.7 on, or without setting
the `/Zc:__cplusplus` compile switch that would fix `__cplusplus` on MSVC. (Without the switch
the compiler allways reports `199711L`
the compiler always reports `199711L`
([see](https://blogs.msdn.microsoft.com/vcblog/2018/04/09/msvc-now-correctly-reports-__cplusplus/)),
but `_MSVC_LANG` works without it.**

Expand All @@ -182,7 +182,7 @@ using namespace ghc::filesystem;
using ifstream = ghc::filesystem::ifstream;
using ofstream = ghc::filesystem::ofstream;
using fstream = ghc::filesystem::fstream;
}
}
#endif
```

Expand All @@ -195,18 +195,18 @@ forwarding-/implementation-header based approach (see below) to avoid this.**

:information_source: **Hint:** There is an additional header named `ghc/fs_std.hpp` that implements this
dynamic selection of a filesystem implementation, that you can include
instead of `ghc/filesystem.hpp` when you want std::filesystem where
available and ghc::filesystem where not.
instead of `ghc/filesystem.hpp` when you want `std::filesystem` where
available and `ghc::filesystem` where not.


### Using it as Forwarding-/Implementation-Header

Alternatively, starting from v1.1.0 `ghc::filesystem` can also be used by
including one of two additional wrapper headers. These allow to include
a forwarded version in most places (`ghc/fs_fwd.hpp`) while hiding the
implementation details in a single cpp that includes `ghc/fs_impl.hpp` to
implementation details in a single cpp file that includes `ghc/fs_impl.hpp` to
implement the needed code. That way system includes are only visible from
inside the cpp, all other places are clean.
inside the cpp file, all other places are clean.

Be aware, that it is currently not supported to hide the implementation
into a Windows-DLL, as a DLL interface with C++ standard templates in interfaces
Expand Down Expand Up @@ -236,7 +236,7 @@ using namespace ghc::filesystem;
using ifstream = ghc::filesystem::ifstream;
using ofstream = ghc::filesystem::ofstream;
using fstream = ghc::filesystem::fstream;
}
}
#endif
```

Expand Down Expand Up @@ -271,7 +271,7 @@ as a git submodule, add the directory to your `CMakeLists.txt` with
to ensure correct include path that allow `#include <ghc/filesystem.hpp>`
to work.

The `CMakeLists.txt` offers a few options to customize its behaviour:
The `CMakeLists.txt` offers a few options to customize its behavior:

* `GHC_FILESYSTEM_BUILD_TESTING` - Compile tests, default is `OFF` when used as
a submodule, else `ON`.
Expand Down Expand Up @@ -317,13 +317,13 @@ The only additions to the standard are documented here:
### `ghc::filesystem::ifstream`, `ghc::filesystem::ofstream`, `ghc::filesystem::fstream`

These are simple wrappers around `std::ifstream`, `std::ofstream` and `std::fstream`.
They simply add an `open()` method and a constuctor with an `ghc::filesystem::path`
They simply add an `open()` method and a constructor with an `ghc::filesystem::path`
argument as the `fstream` variants in C++17 have them.

### `ghc::filesystem::u8arguments`

This is a helper class that currently checks for UTF-8 encoding on non-Windows platforms but on Windows it
fetches the command line arguments als Unicode strings from the OS with
fetches the command line arguments as Unicode strings from the OS with

```cpp
::CommandLineToArgvW(::GetCommandLineW(), &argc)
Expand Down Expand Up @@ -383,7 +383,7 @@ where a regular file of the same name prohibits the creation of a directory and
the user of those functions to double-check via `fs::is_directory` if it really worked.
The more intuitive approach to directory creation of treating a file with that name as an
error is also advocated by the newer paper
[WG21 P1164R0](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1164r0.pdf), the revison
[WG21 P1164R0](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1164r0.pdf), the revision
P1161R1 was agreed upon on Kona 2019 meeting [see merge](https://github.com/cplusplus/draft/issues/2703)
and GCC by now switched to following its proposal
([GCC #86910](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86910)).
Expand All @@ -400,7 +400,7 @@ These are not implemented under C++11 and C++14, as there is no
`std::basic_string_view` available and I did want to keep this
implementation self-contained and not write a full C++17-upgrade for
C++11/14. Starting with v1.1.0 these are supported when compiling
ghc::filesystem under C++17 of C++20.
`ghc::filesystem` under C++17 of C++20.
Starting with v1.5.2 `ghc::filesystem` will try to allow the use of
`std::experimental::basic_string_view` where it detects is availability.
Expand All @@ -425,8 +425,8 @@ To not depend on any external third party libraries and still stay portable and
compact, this implementation is following the ["UTF-8 Everywhere" philosophy](https://utf8everywhere.org/) in that all
`std::string` instances will be interpreted the same as `std::u8string` encoding
wise and as being in UTF-8. The `std::u16string` will be seen as UTF-16 and `std::u32string` will be
seen as unicode codepoints. Depending on the size of `std::wstring` characters, it will handle
`std::wstring` as being UTF-16 (e.g. Windows) or `char32_t` unicode codepoints
seen as Unicode codepoints. Depending on the size of `std::wstring` characters, it will handle
`std::wstring` as being UTF-16 (e.g. Windows) or `char32_t` Unicode codepoints
(currently all other platforms).

#### Differences of Specific Interfaces
Expand All @@ -443,7 +443,7 @@ use the W-variant of the Windows-API call (e.g. `GetFileAttributesW(p.c_str())`)
:information_source: **Note:** _When using the old behavior by defining
`GHC_WIN_DISABLE_WSTRING_STORAGE_TYPE`, use the `path::wstring()` member
(e.g. `GetFileAttributesW(p.wstring().c_str())`). This gives you the
Unicode variant independant of the `UNICODE` macro and makes sharing code
Unicode variant independent of the `UNICODE` macro and makes sharing code
between Windows, Linux and macOS easier and works with `std::filesystem` and
`ghc::filesystem`._

Expand Down Expand Up @@ -472,7 +472,7 @@ Any additional observations are welcome!

#### fs.path ([ref](https://en.cppreference.com/w/cpp/filesystem/path))

Since v1.5.0 the complete inner mechanics of this implementations `fs::path`
Since v1.5.0 the complete inner mechanics of this implementations `fs::path`
where changed to the _native_ format as the internal representation.
Creating any mixed slash `fs::path` object under Windows (e.g. with `"C:\foo/bar"`)
will lead clean path with `"C:\foo\bar"` via `native()` and `"C:/foo/bar"` via
Expand All @@ -484,10 +484,10 @@ Additionally this implementation follows the standards suggestion to handle
posix paths of the form `"//host/path"` and USC path on windows also as having
a root-name (e.g. `"//host"`). The GCC implementation didn't choose to do that
while testing on Ubuntu 18.04 and macOS with GCC 8.1.0 or Clang 7.0.0. This difference
will show as warnings under std::filesystem. This leads to a change in the
will show as warnings under `std::filesystem`. This leads to a change in the
algorithm described in the standard for `operator/=(path& p)` where any path
`p` with `p.is_absolute()` will degrade to an assignment, while this implementation
has the exception where `*this == *this.root_name()` and `p == preferred_seperator`
has the exception where `*this == *this.root_name()` and `p == preferred_separator`
a normal append will be done, to allow:

```cpp
Expand All @@ -497,7 +497,7 @@ for (auto p : p1) p2 /= p;
ASSERT(p1 == p2);
```
For all non-host-leading paths the behaviour will match the one described by
For all non-host-leading paths the behavior will match the one described by
the standard.
Expand Down Expand Up @@ -528,12 +528,12 @@ to the expected behavior.
### v1.5.3 (WIP)
* Fix for [#107](https://github.com/gulrak/filesystem/issues/107), the error
handling for status calls was suppressing errors on symlink targets.
handling for status calls was suppressing errors on symlink targets.
* Pull request [#106](https://github.com/gulrak/filesystem/issues/106), fixed
detection of AppleClang for compile options.
* Pull request [#105](https://github.com/gulrak/filesystem/issues/105), added
option GHC_FILESYSTEM_BUILD_STD_TESTING to override additional build of
`std::filesystem` versions of the tests for comparison and the possibility
`std::filesystem` versions of the tests for comparison and the possibility
to use GHC_FILESYSTEM_TEST_COMPILE_FEATURES to prefill the used compile
features defaulting to CMAKE_CXX_COMPILE_FEATURES when not given.
Expand All @@ -546,15 +546,15 @@ to the expected behavior.
* Pull request [#103](https://github.com/gulrak/filesystem/pull/103), `wchar_t`
was not in the list of supported char types on non-Windows backends.
* Pull request [#102](https://github.com/gulrak/filesystem/pull/102), improved
`string_view` support makes use of `<string_view>` or `<experiemental/string_view>`
`string_view` support makes use of `<string_view>` or `<experimental/string_view>`
when available, and allows use of custom `basic_string_view` implementation
when defining `GHC_HAS_CUSTOM_STRING_VIEW` and importing the string view
into the `ghc::filesystem` namespace before including filesystem header.
* Pull request [#101](https://github.com/gulrak/filesystem/pull/101), fix for
[#100](https://github.com/gulrak/filesystem/issues/100), append and concat
type of operations on path called redundant conversions.
* Pull request [#98](https://github.com/gulrak/filesystem/pull/98), on older
linux variants (GCC 7/8), the comerative `std::filesystem` tests now link
linux variants (GCC 7/8), the comparison `std::filesystem` tests now link
with `-lrt` to avoid issues.
* Fix for [#97](https://github.com/gulrak/filesystem/issues/97), on BTRFS the
test case for `fs::hard_link_count` failed due to the filesystems behavior,
Expand Down Expand Up @@ -588,7 +588,7 @@ to the expected behavior.
* `fs::path::native()` and `fs::path::c_str()` can now be `noexcept` as the
standard mandates
* On Windows `wchar_t` is now the default for `fs::path::value_type` and
`std::wstring` is the default für `fs::path::string_type`.
`std::wstring` is the default for `fs::path::string_type`.
* This allows the implementation to call Win-API without allocating
conversions
* Thread-safety on `const` methods of `fs::path` is no longer an issue
Expand Down Expand Up @@ -654,8 +654,8 @@ to the expected behavior.
`filesystem_test.cpp` was completed to fulfill the requirements to build on CentOS 7 with
`devtoolset-9`. CentOS 7 and CentOS 8 are now part of the CI builds.
* Bugfix for [#70](https://github.com/gulrak/filesystem/issues/70), root names are now case
insensitive on Windows. This fix also adds the new behaviour switch `LWG_2936_BEHAVIOUR`
that allows to enable post C++17 `fs::path::compare` behaviour, where the comparison is as
insensitive on Windows. This fix also adds the new behavior switch `LWG_2936_BEHAVIOUR`
that allows to enable post C++17 `fs::path::compare` behavior, where the comparison is as
if it was an element wise path comparison as described in
[LWG 2936](https://cplusplus.github.io/LWG/issue2936) and C++20 `[fs.path.compare]`.
It is default off in v1.3.6 and will be default starting from v1.4.0 as it changes ordering.
Expand Down Expand Up @@ -696,7 +696,7 @@ to the expected behavior.
* Pull request [#52](https://github.com/gulrak/filesystem/pull/52), an ARM Linux
target is now part of the CI infrastructure with the service of Drone CI.
* Pull request [#51](https://github.com/gulrak/filesystem/pull/51), FreeBSD is now
part of the CI infrastucture with the service of Cirrus CI.
part of the CI infrastructure with the service of Cirrus CI.
* Pull request [#50](https://github.com/gulrak/filesystem/pull/50), adaptive cast to
`timespec` fields to avoid warnings.
Expand All @@ -714,10 +714,10 @@ to the expected behavior.
* The Visual Studio 2019 compiler, GCC 9.2 and Clang 9.0 where added to the
CI configuration.
* Bugfix for [#41](https://github.com/gulrak/filesystem/issues/41), `fs::rename`
on Windows didn't replace an axisting regular file as required by the standard,
on Windows didn't replace an existing regular file as required by the standard,
but gave an error. New tests and a fix as provided in the issue was implemented.
* Bugfix for [#39](https://github.com/gulrak/filesystem/issues/39), for the
forwarding use via `fs_fwd.hpp` or `fs_std_fwd.hpp` der was a use of
forwarding use via `fs_fwd.hpp` or `fs_std_fwd.hpp` there was a use of
`DWORD` in the forwarding part leading to an error if `Windows.h` was not
included before the header. The tests were changed to give an error in that
case too and the useage of `DWORD` was removed.
Expand Down Expand Up @@ -749,20 +749,20 @@ to the expected behavior.
* Bugfix for [#33](https://github.com/gulrak/filesystem/issues/33), fixes
an issue with `fs::path::lexically_normal()` that leaves a trailing separator
in case of a resulting path ending with `..` as last element.
* Bugfix for [#36](https://github.com/gulrak/filesystem/issues/36), warings
on Xcode 11.2 due to unhelpfull references in path element iteration.
* Bugfix for [#36](https://github.com/gulrak/filesystem/issues/36), warnings
on Xcode 11.2 due to unhelpful references in path element iteration.
### [v1.2.6](https://github.com/gulrak/filesystem/releases/tag/v1.2.6)
* Pull request [#23](https://github.com/gulrak/filesystem/pull/23), tests and
examples can now be disabled in CMake via seting `BUILD_TESTING` and
examples can now be disabled in CMake via setting `BUILD_TESTING` and
`BUILD_EXAMPLES` to `NO`, `OFF` or `FALSE`.
* Pull request [#25](https://github.com/gulrak/filesystem/pull/25),
missing specialization for construction from `std::string_view` when
available was added.
* Additional test case when `std::string_view` is available.
* Bugfix for [#27](https://github.com/gulrak/filesystem/issues/27), the
`fs::path::preferred_seperator` declaration was not compiling on pre
`fs::path::preferred_separator` declaration was not compiling on pre
C++17 compilers and no test accessed it, to show the problem. Fixed
it to an construction C++11 compiler should accept and added a test that
is successful on all combinations tested.
Expand Down Expand Up @@ -801,7 +801,7 @@ to the expected behavior.
compiling on Windows with defined `GHC_WIN_WSTRING_STRING_TYPE`, this is
default when using the `ghc/fs_std*.hpp` header, to enhance compatibility.
* New feature ([#18](https://github.com/gulrak/filesystem/issues/18)), optional
filesystem exceptions/errors on unicode errors with defined
filesystem exceptions/errors on Unicode errors with defined
`GHC_RAISE_UNICODE_ERRORS` (instead of replacing invalid code points or
UTF-8 encoding errors with the replacement character `U+FFFD`).
* Pull request ([#20](https://github.com/gulrak/filesystem/pull/20)), fix for
Expand All @@ -812,9 +812,9 @@ to the expected behavior.
* Additional Bugfix for ([#12](https://github.com/gulrak/filesystem/issues/12)),
error in old unified `readdir/readdir_r` code of `fs::directory_iterator`;
as `readdir_r` is now depricated, I decided to drop it and the resulting
as `readdir_r` is now deprecated, I decided to drop it and the resulting
code is much easier, shorter and due to more refactoring faster
* Fix for crashing unit tests against MSVC C++17 std::filesystem
* Fix for crashing unit tests against MSVC C++17 `std::filesystem`
* Travis-CI now additionally test with Xcode 10.2 on macOS
* Some minor refactorings
Expand All @@ -824,10 +824,10 @@ to the expected behavior.
`fs::path::lexically_normal()` had some issues with `".."`-sequences.
* Bugfix for ([#12](https://github.com/gulrak/filesystem/issues/12)),
`fs::recursive_directory_iterator` could run into endless loops,
the methods depth() and pop() had issues and the copy behaviour and
the methods depth() and pop() had issues and the copy behavior and
`input_iterator_tag` conformance was broken, added tests
* Restructured some CMake code into a macro to ease the support for
C++17 std::filesystem builds of tests and examples for interoperability
C++17 `std::filesystem` builds of tests and examples for interoperability
checks.
* Some fixes on Windows tests to ease interoperability test runs.
* Reduced noise on `fs::weakly_canonical()` tests against `std::fs`
Expand Down Expand Up @@ -912,7 +912,7 @@ to the expected behavior.
available.
* Starting with this version, only even patch level versions will be tagged and
odd patch levels mark in-between non-stable wip states.
* Tests can now also be run against MS version of std::filesystem for comparison.
* Tests can now also be run against MS version of `std::filesystem` for comparison.
* Added missing `fstream` include.
* Removed non-conforming C99 `timespec`/`timeval` usage.
* Fixed some integer type mismatches that could lead to warnings.
Expand All @@ -925,7 +925,7 @@ to the expected behavior.
paths for non-existant argument paths. ([#1](https://github.com/gulrak/filesystem/issues/1))
* Bugfix: `ghc::filesystem::remove_all` now also counts directories removed ([#2](https://github.com/gulrak/filesystem/issues/2))
* Bugfix: `recursive_directory_iterator` tests didn't respect equality domain issues
and dereferencable constraints, leading to fails on `std::filesystem` tests.
and dereferencapable constraints, leading to fails on `std::filesystem` tests.
* Bugfix: Some `noexcept` tagged methods and functions could indirectly throw exceptions
due to UFT-8 decoding issues.
* `std_filesystem_test` is now also generated if LLVM/clang 7.0.0 is found.
Expand All @@ -934,5 +934,5 @@ to the expected behavior.
### [v1.0.0](https://github.com/gulrak/filesystem/releases/tag/v1.0.0)
This was the first public release version. It implements the full range of
C++17 std::filesystem, as far as possible without other C++17 dependencies.
C++17 `std::filesystem`, as far as possible without other C++17 dependencies.

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