Version 1.6.1: Platform fixes

This version provides a few fixes for special cases, such as mixing with Windows.h and better defaults for systems like Hunter. The one new feature is the ability to produce "branded" single file output for providing custom namespaces or custom macro names.

• Added fix and test for including Windows.h #145
• No longer build single file by default if main project, supports systems stuck on Python 2.6 #149, #151
• Branding support for single file output #150

Version 1.6: Formatting help

Added a new formatting system #109. You can now set the formatter on Apps. This has also simplified the internals of Apps and Options a bit by separating most formatting code.

• Added CLI::Formatter and formatter slot for apps, inherited.
• FormatterBase is the minimum required.
• FormatterLambda provides for the easy addition of an arbitrary function.
• Added help_all support (not added by default).

Changes to the help system (most normal users will not notice this):

• Renamed single_name to get_name(false, false) (the default).
• The old get_name() is now get_name(false, true).
• The old get_pname() is now get_name(true, false).
• Removed help_* functions.
• Protected function _has_help_positional removed.
• format_help can now be chained.
• Added getters for the missing parts of options (help no longer uses any private parts).
• Help flags now use new short_circuit property to simplify parsing. #121

New for Config file reading and writing #121:

• Overridable, bidirectional Config.
• ConfigINI provided and used by default.
• Renamed ini to config in many places.
• Has config_formatter() and get_config_formatter().
• Dropped prefix argument from config_to_str.
• Added ConfigItem.
• Added an example of a custom config format using nlohmann/json. #138

Validators are now much more powerful #118, all built in validators upgraded to the new form:

• A subclass of CLI::Validator is now also accepted.
• They now can set the type name to things like PATH and INT in [1-4].
• Validators can be combined with & and |.
• Old form simple validators are still accepted.

Other changes:

• Fixing parse(args)'s args setting and ordering after parse. #141
• Replaced set_custom_option with type_name and type_size instead of set_custom_option. Methods return this. [#136]
• Dropped set_ on Option's type_name, default_str, and default_val. [#136]
• Removed set_ from App's failure_message, footer, callback, and name. [#136]
• Fixed support N<-1 for type_size. #140
• Added ->each() to make adding custom callbacks easier. #126
• Allow empty options add_option("-n",{}) to be edited later with each #142
• Added filter argument to get_subcommands, get_options; use empty filter {} to avoid filtering.
• Added get_groups() to get groups.
• Better support for manual options with get_option, set_results, and empty. #119
• lname and sname have getters, added const get_parent. #120
• Using add_set will now capture L-values for sets, allowing further modification. #113
• Dropped duplicate way to run get_type_name (get_typeval).
• Removed requires in favor of needs (deprecated in last version). #112
• Const added to argv. #126

Backend and testing changes:

• Internally, type_name is now a lambda function; for sets, this reads the set live. #116
• Cleaner tests without app.reset() (and reset is now clear). #141
• Better CMake policy handling. #110
• Includes are properly sorted. #120
• Testing (only) now uses submodules. #111

Version 1.5.4: Optionals fix

This version fixes the optional search in the single file version; some macros were not yet defined when it did the search. You can define the CLI11_*_OPTIONAL macros to 0 if needed to eliminate the search.

Version 1.5.3: Compiler compatibility

This version fixes older AppleClang compilers by removing the optimization for casting. The minimum version of Boost Optional supported has been clarified to be 1.58. CUDA 7.0 NVCC is now supported.

Version 1.5.2: LICENSE in single header mode

This is a quick patch release that makes LICENSE part of the single header file, making it easier to include. Minor cleanup from codacy. No significant code changes from 1.5.1.

Version 1.5.1: Access

This patch release adds better access to the App progromatically, to assist with writing custom converters to other formats. It also improves the help output, and uses a new feature in CLI11 1.5 to fix an old "quirk" in the way unlimited options and positionals interact.

• Make mixing unlimited positionals and options more intuitive #102
• Add missing getters get_options and get_description to App #105
• The app name now can be set, and will override the auto name if present #105
• Add (REQUIRED) for required options #104
• Print simple name for Needs/Excludes #104
• Use Needs instead of Requires in help print #104
• Groups now are listed in the original definition order #106

Version 1.5: Optionals

This version introduced support for optionals, along with clarification and examples of custom conversion overloads. Enums now have been dropped from the automatic conversion system, allowing explicit protection for out-of-range ints (or a completely custom conversion). This version has some internal cleanup and improved support for the newest compilers. Several bugs were fixed, as well.

Note: This is the final release with requires, please switch to needs.

• Fix unlimited short options eating two values before checking for positionals when no space present #90
• Symmetric exclude text when excluding options, exclude can be called multiple times #64
• Support for std::optional, std::experimental::optional, and boost::optional added if __has_include is supported #95
• All macros/CMake variables now start with CLI11_ instead of just CLI_ #95
• The internal stream was not being cleared before use in some cases. Fixed. #95
• Using an emum now requires explicit conversion overload #97
• The separator -- now is removed when it ends unlimited arguments #100

Other, non-user facing changes:

• Added Macros.hpp with better C++ mode discovery #95
• Deprecated macros added for all platforms
• C++17 is now tested on supported platforms #95
• Informational printout now added to CTest #95
• Better single file generation #95
• Added support for GTest on MSVC 2017 (but not in C++17 mode, will need next version of GTest)
• Types now have a specific size, separate from the expected number - cleaner and more powerful internally #92
• Examples now run as part of testing #99

Version 1.4: More feedback

This version adds lots of smaller fixes and additions after the refactor in version 1.3. More ways to download and use CLI11 in CMake have been added. INI files have improved support.

• Lexical cast is now more strict than before #68 and fails on overflow #84
• Added get_parent() to access the parent from a subcommand
• Added ExistingPath validator #73
• app.allow_ini_extras() added to allow extras in INI files #70
• Multiline INI comments now supported
• Descriptions can now be written with config_to_str #66
• Double printing of error message fixed #77
• Renamed requires to needs to avoid C++20 keyword #75, #82
• MakeSingleHeader now works if outside of git #78
• Adding install support for CMake #79, improved support for find_package #83, #84
• Added support for Conan.io #83

Version 1.3: Refactor

This version focused on refactoring several key systems to ensure correct behavior in the interaction of different settings. Most caveats about features only working on the main App have been addressed, and extra arguments have been reworked. Inheritance of defaults makes configuring CLI11 much easier without having to subclass. Policies add new ways to handle multiple arguments to match your favorite CLI programs. Error messages and help messages are better and more flexible. Several bugs and odd behaviors in the parser have been fixed.

• Added a version macro, CLI11_VERSION, along with *_MAJOR, *_MINOR, and *_PATCH, for programmatic access to the version.
• Reworked the way defaults are set and inherited; explicit control given to user with ->option_defaults() #48
• Hidden options now are based on an empty group name, instead of special "hidden" keyword #48
• parse no longer returns (so CLI11_PARSE is always usable) #37
• Added remaining() and remaining_size() #37
• allow_extras and prefix_command are now valid on subcommands #37
• Added take_last to only take last value passed #40
• Added multi_option_policy and shortcuts to provide more control than just a take last policy #59
• More detailed error messages in a few cases #41
• Footers can be added to help #42
• Help flags are easier to customize #43
• Subcommand now support groups #46
• CLI::RuntimeError added, for easy exit with error codes #45
• The clang-format script is now no longer "hidden" #48
• The order is now preserved for subcommands (list and callbacks) #49
• Tests now run individually, utilizing CMake 3.10 additions if possible #50
• Failure messages are now customizable, with a shorter default #52
• Some improvements to error codes #53
• require_subcommand now offers a two-argument form and negative values on the one-argument form are more useful #51
• Subcommands no longer match after the max required number is obtained #51
• Unlimited options no longer prioritize over remaining/unlimited positionals #51
• Added ->transform which modifies the string parsed #54
• Changed of API in validators to void(std::string &) (const for users), throwing providing nicer errors #54
• Added CLI::ArgumentMismatch #56 and fixed missing failure if one arg expected #55
• Support for minimum unlimited expected arguments #56
• Single internal arg parse function #56
• Allow options to be disabled from INI file, rename add_config to set_config #60

Converting from CLI11 1.2:

• app.parse no longer returns a vector. Instead, use app.remaining(true).
• "hidden" is no longer a special group name, instead use ""
• Validators API has changed to return an error string; use .empty() to get the old bool back
• Use .set_help_flag instead of accessing the help pointer directly (discouraged, but not removed yet)
• add_config has been renamed to set_config
• Errors thrown in some cases are slightly more specific

Version 1.2: Stability

This release focuses on making CLI11 behave properly in corner cases, and with config files on the command line. This includes fixes for a variety of reported issues. A few features were added to make life easier, as well; such as a new flag callback and a macro for the parse command.

• Added functional form of flag #33, automatic on C++14
• Fixed Config file search if passed on command line #30
• Added CLI11_PARSE(app, argc, argv) macro for simple parse commands (does not support returning arg)
• The name string can now contain spaces around commas #29
• set_default_str now only sets string, and set_default_val will evaluate the default string given #26
• Required positionals now take priority over subcommands #23
• Extra requirements enforced by Travis