docs: release update (#974)

Update the Readme and the changelog in preparation for a release.

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henry.fredrick.schreiner@cern.ch>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

CHANGELOG.md

@@ -1,5 +1,71 @@
 # Changelog
 
+## Version 2.4: Unicode and TOML support
+
+This version adds Unicode support, support for TOML standard including multiline
+strings, digit separators, string escape sequences,and dot notation. An initial
+round of a fuzzer was added to testing which has caught several bugs related to
+config file processing, and a few other edge cases not previously observed.
+
+- Add Unicode support and bug fixes [#804][], [#923][], [#876][], [#848][],
+  [#832][], [#987][]
+- Match TOML standard for string and numerical entries, multiline strings
+  [#968][], [#967][],[#964][], [#935][]
+- Add validation for environmental variables [#926][]
+- Add an escape string transform [#970][]
+- Add A REVERSE multi-option policy to support multiple config files and other
+  applications [#918][]
+- Add usage message replacement [#768][]
+- Allow using dot notation for subcommand arguments such as `--sub1.field`
+  [#789][]
+- Bugfix: Fuzzing tests and fixes [#930][], [#905][], [#874][], [#846][]
+- Bugfix: Missing coverage tests [#928][]
+- Bugfix: CMake package and package config tests and fixes [#916][]
+- Bugfix: Support for Windows ARM compilation and tests [#913][], [#914][]
+- Bugfix: Environmental variable checks in non-triggered subcommands [#904][]
+- Bugfix: Environmental variables were not being correctly process by config
+  pointer [#891][]
+- Bugfix: Undefined behavior in `sum_string_vector` [#893][]
+- Bugfix: Warnings and updates for CUDA 11 support [#851][]
+- Backend: Add tests for newer compilers (lost with Travis CI) [#972][]
+- Backend: Increase minimum CMake to 3.5 [#898][]
+- Backend: Remove integrated Conan support (provided now by Conan center)
+  [#853][]
+- Tests: Support Catch2 Version 3 [#896][], [#980][]
+
+[#768]: https://github.com/CLIUtils/CLI11/pull/768
+[#789]: https://github.com/CLIUtils/CLI11/pull/789
+[#804]: https://github.com/CLIUtils/CLI11/pull/804
+[#832]: https://github.com/CLIUtils/CLI11/pull/832
+[#846]: https://github.com/CLIUtils/CLI11/pull/846
+[#848]: https://github.com/CLIUtils/CLI11/pull/848
+[#851]: https://github.com/CLIUtils/CLI11/pull/851
+[#853]: https://github.com/CLIUtils/CLI11/pull/853
+[#874]: https://github.com/CLIUtils/CLI11/pull/874
+[#876]: https://github.com/CLIUtils/CLI11/pull/876
+[#891]: https://github.com/CLIUtils/CLI11/pull/891
+[#893]: https://github.com/CLIUtils/CLI11/pull/893
+[#896]: https://github.com/CLIUtils/CLI11/pull/896
+[#898]: https://github.com/CLIUtils/CLI11/pull/898
+[#904]: https://github.com/CLIUtils/CLI11/pull/904
+[#905]: https://github.com/CLIUtils/CLI11/pull/905
+[#913]: https://github.com/CLIUtils/CLI11/pull/913
+[#914]: https://github.com/CLIUtils/CLI11/pull/914
+[#916]: https://github.com/CLIUtils/CLI11/pull/916
+[#918]: https://github.com/CLIUtils/CLI11/pull/918
+[#923]: https://github.com/CLIUtils/CLI11/pull/923
+[#926]: https://github.com/CLIUtils/CLI11/pull/926
+[#928]: https://github.com/CLIUtils/CLI11/pull/928
+[#930]: https://github.com/CLIUtils/CLI11/pull/930
+[#935]: https://github.com/CLIUtils/CLI11/pull/935
+[#964]: https://github.com/CLIUtils/CLI11/pull/964
+[#967]: https://github.com/CLIUtils/CLI11/pull/967
+[#968]: https://github.com/CLIUtils/CLI11/pull/968
+[#970]: https://github.com/CLIUtils/CLI11/pull/970
+[#972]: https://github.com/CLIUtils/CLI11/pull/972
+[#980]: https://github.com/CLIUtils/CLI11/pull/980
+[#987]: https://github.com/CLIUtils/CLI11/pull/987
+
 ## Version 2.3: Precompilation Support
 
 This version adds a pre-compiled mode to CLI11, which allows you to precompile
@@ -7,7 +73,7 @@ the library, saving time on incremental rebuilds, making CLI11 more competitive
 on compile time with classic compiled CLI libraries. The header-only mode is
 still default, and is not yet distributed via binaries.
 
-- Add `CLI11_PRECOMPILED` as an option. [#762][]
+- Add `CLI11_PRECOMPILED` as an option [#762][]
 - Bugfix: Include `<functional>` in `FormatterFwd` [#727][]
 - Bugfix: Add missing `Macros.hpp` to `Error.hpp` [#755][]
 - Bugfix: Fix subcommand callback trigger [#733][]

README.md

@@ -206,8 +206,8 @@ int main(int argc, char** argv) {
 }
 ```
 
-For more information about 🚧`ensure_utf8` the section on
+For more information about 🆕`ensure_utf8` the section on
-[Unicode support](#unicode-support) below. The 🚧`ensure_utf8` function is only
+[Unicode support](#unicode-support) below. The 🆕`ensure_utf8` function is only
 available in main currently and not in a release.
 
 <details><summary>Note: If you don't like macros, this is what that macro expands to: (click to expand)</summary><p>
@@ -416,7 +416,7 @@ Before parsing, you can set the following options:
   option. Options can be removed from the excludes list with
   `->remove_excludes(opt)`
 - `->envname(name)`: Gets the value from the environment if present and not
-  passed on the command line. 🚧 The value must also pass any validators to be
+  passed on the command line. 🆕 The value must also pass any validators to be
   used.
 - `->group(name)`: The help group to put the option in. No effect for positional
   options. Defaults to `"Options"`. Options given an empty string will not show
@@ -452,7 +452,7 @@ Before parsing, you can set the following options:
   are `CLI::MultiOptionPolicy::Throw`, `CLI::MultiOptionPolicy::Throw`,
   `CLI::MultiOptionPolicy::TakeLast`, `CLI::MultiOptionPolicy::TakeFirst`,
   `CLI::MultiOptionPolicy::Join`, `CLI::MultiOptionPolicy::TakeAll`,
-  `CLI::MultiOptionPolicy::Sum` 🆕, and `CLI::MultiOptionPolicy::Reverse` 🚧.
+  `CLI::MultiOptionPolicy::Sum`, and `CLI::MultiOptionPolicy::Reverse` 🆕.
 - `->check(std::string(const std::string &), validator_name="",validator_description="")`:
   Define a check function. The function should return a non empty string with
   the error message if the check fails
@@ -694,7 +694,7 @@ NOTES: If the container used in `IsMember`, `Transformer`, or
 fast search is performed first, and if that fails a linear search with the
 filters on the key values is performed.
 
-- `CLI::FileOnDefaultPath(default_path)`: 🆕 can be used to check for files in a
+- `CLI::FileOnDefaultPath(default_path)`: can be used to check for files in a
   default path. If used as a transform it will first check that a file exists,
   if it does nothing further is done, if it does not it tries to add a default
   Path to the file and search there again. If the file does not exist an error
@@ -702,7 +702,7 @@ filters on the key values is performed.
   `CLI::FileOnDefaultPath(default_path, false)`. This allows multiple paths to
   be chained using multiple transform calls.
 
-- `CLI::EscapedString`: 🚧 can be used to process an escaped string. The
+- `CLI::EscapedString`: 🆕 can be used to process an escaped string. The
   processing is equivalent to that used for TOML config files, see
   [TOML strings](https://toml.io/en/v1.0.0#string). With 2 notable exceptions.
   \` can also be used as a literal string notation, and it also allows binary
@@ -874,7 +874,7 @@ nameless subcommands are allowed. Callbacks for nameless subcommands are only
 triggered if any options from the subcommand were parsed. Subcommand names given
 through the `add_subcommand` method have the same restrictions as option names.
 
-🚧 Options or flags in a subcommand may be directly specified using dot notation
+🆕 Options or flags in a subcommand may be directly specified using dot notation
 
 - `--subcommand.long=val` (long subcommand option)
 - `--subcommand.long val` (long subcommand option)
@@ -886,7 +886,7 @@ through the `add_subcommand` method have the same restrictions as option names.
 The use of dot notation in this form is equivalent `--subcommand.long <args>` =>
 `subcommand --long <args> ++`. Nested subcommands also work `sub1.subsub` would
 trigger the subsub subcommand in `sub1`. This is equivalent to "sub1 subsub".
-Quotes around the subcommand names are permitted 🚧 following the TOML standard
+Quotes around the subcommand names are permitted 🆕 following the TOML standard
 for such specification. This includes allowing escape sequences. For example
 `"subcommand".'f'` or `"subcommand.with.dots".arg1 = value`.
 
@@ -926,9 +926,9 @@ option_groups. These are:
   before matching. Validation is specified through `transform`, `check`, and
   `each` for an option. If an argument fails validation it is not an error and
   matching proceeds to the next available positional or extra arguments.
-- `.validate_optional_arguments()`:🆕 Specify that optional arguments should
+- `.validate_optional_arguments()`: Specify that optional arguments should pass
-  pass validation before being assigned to an option. Validation is specified
+  validation before being assigned to an option. Validation is specified through
-  through `transform`, `check`, and `each` for an option. If an argument fails
+  `transform`, `check`, and `each` for an option. If an argument fails
   validation it is not an error and matching proceeds to the next available
   positional subcommand or extra arguments.
 - `.excludes(option_or_subcommand)`: If given an option pointer or pointer to
@@ -1014,9 +1014,9 @@ option_groups. These are:
 - `.prefix_command()`: Like `allow_extras`, but stop immediately on the first
   unrecognized item. It is ideal for allowing your app or subcommand to be a
   "prefix" to calling another app.
-- `.usage(message)`: 🚧 Replace text to appear at the start of the help string
+- `.usage(message)`: 🆕 Replace text to appear at the start of the help string
   after description.
-- `.usage(std::string())`: 🚧 Set a callback to generate a string that will
+- `.usage(std::string())`: 🆕 Set a callback to generate a string that will
   appear at the start of the help string after description.
 - `.footer(message)`: Set text to appear at the bottom of the help string.
 - `.footer(std::string())`: Set a callback to generate a string that will appear
@@ -1223,8 +1223,8 @@ is present, it will be read along with the normal command line arguments. The
 file will be read if it exists, and does not throw an error unless `required` is
 `true`. Configuration files are in [TOML][] format by default, though the
 default reader can also accept files in INI format as well. The config reader
-can read most aspects of TOML files including strings both literal 🚧 and with
+can read most aspects of TOML files including strings both literal 🆕 and with
-potential escape sequences 🚧, digit separators 🚧, and multi-line strings 🚧,
+potential escape sequences 🆕, digit separators 🆕, and multi-line strings 🆕,
 and run them through the CLI11 parser. Other formats can be added by an adept
 user, some variations are available through customization points in the default
 formatter. An example of a TOML file:
@@ -1297,9 +1297,9 @@ boolean values are not quoted.
 
 For options or flags which allow 0 arguments to be passed using an empty string
 in the config file, `{}`, or `[]` will convert the result to the default value
-specified via `default_str` or `default_val` on the option 🆕. If no user
+specified via `default_str` or `default_val` on the option. If no user specified
-specified default is given the result is an empty string or the converted value
+default is given the result is an empty string or the converted value of an
-of an empty string.
+empty string.
 
 NOTE: Transforms and checks can be used with the option pointer returned from
 set_config like any other option to validate the input if needed. It can also be
@@ -1427,8 +1427,8 @@ CLI11 supports Unicode and wide strings as defined in the
 
 When using the command line on Windows with unicode arguments, your `main`
 function may already receive broken Unicode. Parsing `argv` at that point will
-not give you a correct string. To fix this, you have three good options and two
+not give you a correct string. To fix this, you have three options; the first is
-bad ones:
+recommended for cross-platform support:
 
 1\. Replace `argv` with `app.ensure_utf8(argv)` before any arguments are parsed.
 `ensure_utf8` will do nothing on systems where `argv` is already in UTF-8 (Such
@@ -1445,40 +1445,13 @@ int main(int argc, char** argv) {
 }
 ```
 
-2\. If you pass unmodified command-line arguments to CLI11, call `app.parse()`
+Be sure you do not modify `argv` before this function call, as the correct
-instead of `app.parse(argc, argv)` (or `CLI11_PARSE(app)` instead of
+values will be reconstructed using Windows APIs and produced by this call. It
-`CLI11_PARSE(app, argc, argv)`). The library will find correct arguments by
+has no effect on other platforms and just passes through `argv`.
-itself.
 
-> [!NOTE]
+<details><summary>Other options (click to expand)</summary><p>
->
-> This approach may not work on weird OS configurations, such as when the
-> `/proc` dir is missing on Linux systems (see also
-> [#845](https://github.com/CLIUtils/CLI11/issues/845)).
->
-> ```cpp
-> int main() {
->     CLI::App app;
->     // ...
->     CLI11_PARSE(app);
-> }
-> ```
 
-3\. Get correct arguments with which the program was originally executed using
+2\. Use the Windows-only non-standard `wmain` function, which accepts
-provided functions: `CLI::argc()` and `CLI::argv()`. These three methods are the
-only cross-platform ways of handling unicode correctly.
-
-```cpp
-int main() {
-    CLI::App app;
-    // ...
-    CLI11_PARSE(app, CLI::argc(), CLI::argv());
-}
-```
-
-<details><summary>Bad options (click to expand)</summary><p>
-
-4\. Use the Windows-only non-standard `wmain` function, which accepts
 `wchar_t *argv[]` instead of `char* argv[]`. Parsing this will allow CLI to
 convert wide strings to UTF-8 without losing information.
 
@@ -1490,10 +1463,10 @@ int wmain(int argc, wchar_t *argv[]) {
 }
 ```
 
-5\. Retrieve arguments yourself by using Windows APIs like
+3\. Retrieve arguments yourself by using Windows APIs like
 [`CommandLineToArgvW`](https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-commandlinetoargvw)
 and pass them to CLI. This is what the library is doing under the hood in
-`CLI::argv()`.
+`ensure_utf8`.
 
 </p></details>
 </br>