CHANGELOG.md

Changelog

Unreleased

• add mechanism to allow option groups to be hidden and all options be considered part of the parent for help display

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

Version 2.4.1: Missing header

A transitive include that might be present in some standard libraries is now included directly. This also fixes a test on architectures that need libatomic linked and fix an inadvertent breaking change regarding unused defaults for config files

• Bugfix: Include cstdint #996
• Bugfix: Fix change in operation of config_ptr with unused default in the count method #1003
• Tests: Include libatomic if required for fuzzing test #1000

Version 2.4.2: Build systems

This version improves support for alternative build systems, like Meson and Bazel. The single-include file now is in its own subdirectory. Several smaller fixes as well.

• Meson: fixes, cleanups, and modernizations #1024 & #1025
• Support building with Bazel #1033
• Restore non-arch dependent path for the pkgconfig file #1012
• Add get_subcommand_no_throw #1016
• Move single file to single-include folder #1030 & #1036
• Fixed app.set_failure_message(...) -> app.failure_message(...) #1018
• Add IWYU pragmas #1008
• Fix internal header include paths #1011
• Improved clarity in RequiredError #1029
• Added ability to use lexical_cast overloads constrained with enable_if #1021
• Bug fixes in latest release related to environmental variable parsing from option groups and unrecognized fields in a config file #1005

Version 2.3: Precompilation Support

This version adds a pre-compiled mode to CLI11, which allows you to precompile 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
• Bugfix: Include <functional> in FormatterFwd #727
• Bugfix: Add missing Macros.hpp to Error.hpp #755
• Bugfix: Fix subcommand callback trigger #733
• Bugfix: Variable rename to avoid warning #734
• Bugfix: split_program_name single file name error #740
• Bugfix: Better support for min/max overrides on MSVC #741
• Bugfix: Support MSVC 2022 #748
• Bugfix: Support negated flag in config file #775
• Bugfix: Better errors for some confusing config file situations #781
• Backend: Restore coverage testing (lost with Travis CI) #747

Version 2.3.1: Missing implementation

A function implementation was missing after the pre-compile move, missed due to the fact we lost 100% after losing coverage checking. We are working on filling out 100% coverage again to ensure this doesn't happen again!

• Bugfix: App::get_option_group implementation missing #793
• Bugfix: Fix spacing when setting an empty footer #796
• Bugfix: Address Klocwork static analysis checking issues #785

Version 2.3.2: Minor maintenance

This version provides a few fixes collected over the last three months before adding features for 2.4.

• Bugfix: Consistently use ADL for lexical_cast, making it easier to extend for custom template types #820
• Bugfix: Tweak the parsing of files for flags with disable_flag_override #800
• Bugfix: Handle out of bounds long long #807
• Bugfix: Spacing of make_description min option output #808
• Bugfix: Print last parsed subcommand's help message #822
• Bugfix: Avoid floating point warning in GCC 12 #803
• Bugfix: Fix a few gcc warnings #813
• Backend: Max CMake tested 3.22 -> 3.24 #823

Version 2.2: Option and Configuration Flexibility

New features include support for output of an empty vector, a summing option policy that can be applied more broadly, and an option to validate optional arguments to discriminate from positional arguments. A new validator to check for files on a default path is included to allow one or more default paths for configuration files or other file arguments. A number of bug fixes and code cleanup for various build configurations. Clean up of some error outputs and extension of existing capability to new types or situations.

There is a possible minor breaking change in behavior of certain types which wrapped an integer, such as std::atomic<int> or std::optional<int> when used in a flag. The default behavior is now as a single argument value vs. summing all the arguments. The default summing behavior is now restricted to pure integral types, int64_t, int, uint32_t, etc. Use the new sum multi option policy to revert to the older behavior. The summing behavior on wrapper types was not originally intended.

• Add MultiOptionPolicy::Sum and refactor the add_flag to fix a bug when using std::optional<bool> as type. #709
• Add support for an empty vector result in TOML and as a default string. #660
• Add .validate_optional_arguments() to support discriminating positional arguments from vector option arguments. #668
• Add CLI::FileOnDefaultPath to check for files on a specified default path. #698
• Change default value display in help messages from =XXXX to [XXXXX] to make it clearer. #666
• Modify the Range Validator to support additional types and clean up the error output. #690
• Bugfix: The trigger on parse modifier did not work on positional argument.s #713
• Bugfix: The single header file generation was missing custom namespace generation. #707
• Bugfix: Clean up File Error handling in the argument processing. #678
• Bugfix: Fix a stack overflow error if nameless commands had fallthrough. #665
• Bugfix: A subcommand callback could be executed multiple times if it was a member of an option group. #666
• Bugfix: Fix an issue with vectors of multi argument types where partial argument sets did not result in an error. #661
• Bugfix: Fix an issue with type the template matching on C++20 and add some CI builds for C++20. #663
• Bugfix: Fix typo in C++20 detection on MSVC. #706
• Bugfix: An issue where the detection of RTTI being disabled on certain MSVC platforms did not disable the use of dynamic cast calls. #666
• Bugfix: Resolve strict-overflow warning on some GCC compilers. #666
• Backend: Add additional tests concerning the use of aliases for option groups in config files. #666
• Build: Add support for testing in meson and cleanup symbolic link generation. #701, #697
• Build: Support building in WebAssembly. #679

Version 2.1: Names and callbacks

The name restrictions for options and subcommands are now much looser, allowing a wider variety of characters than before, even spaces can be used (use quotes to include a space in most shells). The default configuration parser was improved, allowing your configuration to sit in a larger file. And option callbacks have a few new settings, allowing them to be run even if the option is not passed, or every time the option is parsed.

• Option/subcommand name restrictions have been relaxed. Most characters are now allowed. #627
• The config parser can accept streams, specify a specific section, and inline comment characters are supported #630
• force_callback & trigger_on_parse added, allowing a callback to always run on parse even if not present or every time the option is parsed #631
• Bugfix(cmake): Only add CONFIGURE_DEPENDS if CLI11 is the main project #633
• Bugfix(cmake): Ensure the cmake/pkg-config files install to a arch independent path #635
• Bugfix: The single header file generation was missing the include guard. #620

Version 2.1.1: Quick Windows fix

• A collision with min/max macros on Windows has been fixed. #642
• Tests pass with Boost again #646
• Running the pre-commit hooks in development no longer requires docker for clang-format #647

Version 2.1.2: Better subproject builds

• Use main for the main branch of the repository #657
• Bugfix(cmake): Enforce at least C++11 when using CMake target #656
• Build: Don't run doxygen and CTest includes if a submodule #656
• Build: Avoid a warning on CMake 3.22 #656
• Build: Support compiling the tests with an external copy of Catch2 #653

Version 2.0: Simplification

This version focuses on cleaning up deprecated functionality, and some minor default changes. The config processing is TOML compliant now. Atomics and complex numbers are directly supported, along with other container improvements. A new version flag option has finally been added. Subcommands are significantly improved with new features and bugfixes for corner cases. This release contains a lot of backend cleanup, including a complete overhaul of the testing system and single file generation system.

• Built-in config format is TOML compliant now #435
  • Support multiline TOML #528
  • Support for configurable quotes #599
  • Support short/positional options in config mode #443
• More powerful containers, support for %% separator #423
• Support atomic types #520 and complex types natively #423
• Add a type validator CLI::TypeValidator<TYPE> #526
• Add a version flag easily #452, with help message #601
• Support ->silent() on subcommands. #529
• Add alias section to help for subcommands #545
• Allow quotes to specify a program name #605
• Backend: redesigned MakeSingleFiles to have a higher level of manual control, to support future features. #546
• Backend: moved testing from GTest to Catch2 #574
• Bugfix: avoid duplicated and missed calls to the final callback #584
• Bugfix: support embedded newlines in more places #592
• Bugfix: avoid listing helpall as a required flag #530
• Bugfix: avoid a clash with WINDOWS define #563
• Bugfix: the help flag didn't get processed when a config file was required #606
• Bugfix: fix description of non-configurable subcommands in config #604
• Build: support pkg-config #523

Converting from CLI11 1.9

• Removed deprecated set commands, use validators instead. #565
• The final "defaulted" bool has been removed, use ->capture_default_str() instead. Use app.option_defaults()->always_capture_default() to set this for all future options. #597
• Use add_option on a complex number instead of add_complex, which has been removed.

Version 1.9: Config files and cleanup

Config file handling was revamped to fix common issues, and now supports reading TOML.

Adding options is significantly more powerful with support for things like std::tuple and std::array, including with transforms. Several new configuration options were added to facilitate a wider variety of apps. GCC 4.7 is no longer supported.

• Config files refactored, supports TOML (may become default output in 2.0) #362
• Added two template parameter form of add_option, allowing std::optional to be supported without a special import #285
• string_view now supported in reasonable places #300, #285
• immediate_callback, final_callback, and parse_complete_callback added to support controlling the App callback order #292, #313
• Multiple positional arguments maintain order if positionals_at_end is set. #306
• Pair/tuple/array now supported, and validators indexed to specific components in the objects #307, #310
• Footer callbacks supported #309
• Subcommands now support needs (including nameless subcommands) #317
• More flexible type size, more useful add_complex #325, #370
• Added new validators CLI::NonNegativeNumber and CLI::PositiveNumber #342
• Transform now supports arrays #349
• Option groups can be hidden #356
• Add CLI::deprecate_option and CLI::retire_option functions #358
• More flexible and safer Option default_val #387
• Backend: Cleaner type traits #286
• Backend: File checking updates #341
• Backend: Using pre-commit to format, checked in GitHub Actions #336
• Backend: Clang-tidy checked again, CMake option now CL11_CLANG_TIDY #390
• Backend: Warning cleanup, more checks from klocwork #350, Effective C++ #354, clang-tidy #360, CUDA NVCC #365, cross compile #373, sign conversion #382, and cpplint #400
• Docs: CLI11 Tutorial now hosted in the same repository #304, #318, #374
• Bugfix: Fixed undefined behavior in checked_multiply #290
• Bugfix: ->check() was adding the name to the wrong validator #320
• Bugfix: Resetting config option works properly #301
• Bugfix: Hidden flags were showing up in error printout #333
• Bugfix: Enum conversion no longer broken if stream operator added #348
• Build: The meson build system supported #299
• Build: GCC 4.7 is no longer supported, due mostly to GoogleTest. GCC 4.8+ is now required. #160
• Build: Restructured significant portions of CMake build system #394

Converting from CLI11 1.8

• Some deprecated methods dropped
  • add_set* should be replaced with ->check/->transform and CLI::IsMember since 1.8
  • get_defaultval was replaced by get_default_str in 1.8
• The true/false 4th argument to add_option is expected to be removed in 2.0, use ->capture_default_str() since 1.8

Version 1.9.1: Backporting fixes

This is a patch version that backports fixes from the development of 2.0.

• Support relative inclusion #475
• Fix cases where spaces in paths could break CMake support #471
• Fix an issue with string conversion #421
• Cross-compiling improvement for Conan.io #430
• Fix option group default propagation #450
• Fix for C++20 #459
• Support compiling with RTTI off #461

Version 1.8: Transformers, default strings, and flags

Set handling has been completely replaced by a new backend that works as a Validator or Transformer. This provides a single interface instead of the 16 different functions in App. It also allows ordered collections to be used, custom functions for filtering, and better help and error messages. You can also use a collection of pairs (like std::map) to transform the match into an output. Also new are inverted flags, which can cancel or reduce the count of flags, and can also support general flag types. A new add_option_fn lets you more easily program CLI11 options with the types you choose. Vector options now support a custom separator. Apps can now be composed with unnamed subcommand support. The final bool "defaults" flag when creating options has been replaced by ->capture_default_str() (ending an old limitation in construction made this possible); the old method is still available but may be removed in future versions.

• Replaced default help capture: .add_option("name", value, "", True) becomes .add_option("name", value)->capture_default_str() #242
• Added .always_capture_default() #242
• New CLI::IsMember validator replaces set validation #222
• IsMember also supports container of pairs, transform allows modification of result #228
• Added new Transformers, CLI::AsNumberWithUnit and CLI::AsSizeValue #253
• Much more powerful flags with different values #211, general types #235
• add_option now supports bool due to unified bool handling #211
• Support for composable unnamed subcommands #216
• Reparsing is better supported with .remaining_for_passthrough() #265
• Custom vector separator using ->delimiter(char) #209, #221, #240
• Validators added for IP4 addresses and positive numbers #210 and numbers #262
• Minimum required Boost for optional Optionals has been corrected to 1.61 #226
• Positionals can stop options from being parsed with app.positionals_at_end() #223
• Added validate_positionals #262
• Positional parsing is much more powerful #251, duplicates supported #247
• Validators can be negated with ! #230, and now handle tname functions #228
• Better enum support and streaming helper #233 and #228
• Cleanup for shadow warnings #232
• Better alignment on multiline descriptions #269
• Better support for aarch64 #266
• Respect BUILD_TESTING only if CLI11 is the main project; otherwise, CLI11_TESTING must be used #277
• Drop auto-detection of experimental optional and boost::optional; must be enabled explicitly (too fragile) #277 #279

Converting from CLI11 1.7

• .add_option(..., true) should be replaced by .add_option(...)->capture_default_str() or app.option_defaults()->always_capture_default() can be used
• app.add_set("--name", value, {"choice1", "choice2"}) should become app.add_option("--name", value)->check(CLI::IsMember({"choice1", "choice2"}))
• The _ignore_case version of this can be replaced by adding CLI::ignore_case to the argument list in IsMember
• The _ignore_underscore version of this can be replaced by adding CLI::ignore_underscore to the argument list in IsMember
• The _ignore_case_underscore version of this can be replaced by adding both functions listed above to the argument list in IsMember
• If you want an exact match to the original choice after one of the modifier functions matches, use ->transform instead of ->check
• The _mutable versions of this can be replaced by passing a pointer or shared pointer into IsMember
• An error with sets now produces a ValidationError instead of a ConversionError

Version 1.7: Parse breakup

The parsing procedure now maps much more sensibly to complex, nested subcommand structures. Each phase of the parsing happens on all subcommands before moving on with the next phase of the parse. This allows several features, like required environment variables, to work properly even through subcommand boundaries. Passing the same subcommand multiple times is better supported. Several new features were added as well, including Windows style option support, parsing strings directly, and ignoring underscores in names. Adding a set that you plan to change later must now be done with add_mutable_set.

• Support Windows style options with ->allow_windows_style_options. #187 On by default on Windows. #190
• Added parse(string) to split up and parse a command-line style string directly. #186
• Added ignore_underscore and related functions, to ignore underscores when matching names. #185
• The default INI Config will now add quotes to strings with spaces #195
• The default message now will mention the help-all flag also if present #197
• Added ->description to set Option descriptions #199
• Mutating sets (introduced in Version 1.6) now have a clear add method, add_mutable_set*, since the set reference should not expire #200
• Subcommands now track how many times they were parsed in a parsing process. count() with no arguments will return the number of times a subcommand was encountered. #178
• Parsing is now done in phases: shortcurcuits, ini, env, callbacks, and requirements; all subcommands complete a phase before moving on. #178
• Calling parse multiple times is now officially supported without clear (automatic). #178
• Dropped the mostly undocumented short_circuit property, as help flag parsing is a bit more complex, and the default callback behavior of options now works properly. #179
• Use the standard BUILD_TESTING over CLI11_TESTING if defined #183
• Cleanup warnings #191
• Remove deprecated names: set_footer, set_name, set_callback, and set_type_name. Use without the set_ instead. #192

Converting from CLI11 1.6

• ->short_circuit() is no longer needed, just remove it if you were using it - raising an exception will happen in the proper place now without it.
• ->add_set* becomes ->add_mutable_set* if you were using the editable set feature
• footer, name, callback, and type_name must be used instead of the set_* versions (deprecated previously).

Version 1.7.1: Quick patch

This version provides a quick patch for a (correct) warning from GCC 8 for the windows options code.

• Fix for Windows style option parsing #201
• Improve add_subcommand when throwing an exception #204
• Better metadata for Conan package #202

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 1.6.1: 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 1.6.2: Help-all

This version fixes some formatting bugs with help-all. It also adds fixes for several warnings, including an experimental optional error on Clang 7. Several smaller fixes.

• Fixed help-all formatting #163
  • Printing help-all on nested command now fixed (App)
  • Missing space after help-all restored (Default formatter)
  • More detail printed on help all (Default formatter)
  • Help-all subcommands get indented with inner blank lines removed (Default formatter)
  • detail::find_and_replace added to utilities
• Fixed CMake install as subproject with CLI11_INSTALL flag. #156
• Fixed warning about local variable hiding class member with MSVC #157
• Fixed compile error with default settings on Clang 7 and libc++ #158
• Fixed special case of --help on subcommands (general fix planned for 1.7) #168
• Removing an option with links #179

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 enum 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 1.5.1: Access

This patch release adds better access to the App programmatically, 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 1.5.2: 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 1.5.3: 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 1.5.4: Optionals

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 1.4: 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

Version 1.1: Feedback

This release incorporates feedback from the release announcement. The examples are slowly being expanded, some corner cases improved, and some new functionality for tricky parsing situations.

• Added simple support for enumerations, allow non-printable objects #12
• Added app.parse_order() with original parse order (#13, #16)
• Added prefix_command(), which is like allow_extras but ceases processing and puts all remaining args in the remaining_args structure. #8, #17)
• Removed Windows warning (#10, #20)
• Some improvements to CMake, detect Python and no dependencies on Python 2 (like Python 3) (#18, #21)

Version 1.0: Official release

This is the first stable release for CLI11. Future releases will try to remain backward compatible and will follow semantic versioning if possible. There were a few small changes since version 0.9:

• Cleanup using clang-tidy and clang-format
• Small improvements to Timers, easier to subclass Error
• Move to 3-Clause BSD license

Version 0.9: Polish

This release focused on cleaning up the most exotic compiler warnings, fixing a few oddities of the config parser, and added a more natural method to check subcommands.

• Better CMake named target (CLI11)
• More warnings added, fixed
• Ini output now includes =false when default_also is true
• Ini no longer lists the help pointer
• Added test for inclusion in multiple files and linking, fixed issues (rarely needed for CLI, but nice for tools)
• Support for complex numbers
• Subcommands now test true/false directly or with ->parsed(), cleaner parse

Version 0.8: CLIUtils

This release moved the repository to the CLIUtils main organization.

• Moved to CLIUtils on GitHub
• Fixed docs build and a few links

Version 0.7: Code coverage 100%

Lots of small bugs fixed when adding code coverage, better in edge cases. Much more powerful ini support.

• Allow comments in ini files (lines starting with ;)
• Ini files support flags, vectors, subcommands
• Added CodeCov code coverage reports
• Lots of small bugfixes related to adding tests to increase coverage to 100%
• Error handling now uses scoped enum in errors
• Reparsing rules changed a little to accommodate Ini files. Callbacks are now called when parsing INI, and reset any time results are added.
• Adding extra utilities in full version only, Timer (not needed for parsing, but useful for general CLI applications).
• Better support for custom add_options like functions.

Version 0.6: Cleanup

Lots of cleanup and docs additions made it into this release. Parsing is simpler and more robust; fall through option added and works as expected; much more consistent variable names internally.

• Simplified parsing to use vector<string> only
• Fixed fallthrough, made it optional as well (default: off): .fallthrough().
• Added string versions of ->requires() and ->excludes() for consistency.
• Renamed protected members for internal consistency, grouped docs.
• Added the ability to add a number to .require_subcommand().

Version 0.5: Windows support

• Allow Hidden options.
• Throw OptionAlreadyAdded errors for matching subcommands or options, with ignore-case included, tests
• ->ignore_case() added to subcommands, options, and add_set_ignore_case. Subcommands inherit setting from parent App on creation.
• Subcommands now can be "chained", that is, left over arguments can now include subcommands that then get parsed. Subcommands are now a list (get_subcommands). Added got_subcommand(App_or_name) to check for subcommands.
• Added .allow_extras() to disable error on failure. Parse returns a vector of leftover options. Renamed error to ExtrasError, and now triggers on extra options too.
• Added require_subcommand to App, to simplify forcing subcommands. Do not do add_subcommand()->require_subcommand, since that is the subcommand, not the main App.
• Added printout of ini file text given parsed options, skips flags.
• Support for quotes and spaces in ini files
• Fixes to allow support for Windows (added Appveyor) (Uses -, not / syntax)

Version 0.4: Ini support

• Updates to help print
• Removed run, please use parse unless you subclass and add it
• Supports ini files mixed with command line, tested
• Added Range for further Plumbum compatibility
• Added function to print out ini file

Version 0.3: Plumbum compatibility

• Added ->requires, ->excludes, and ->envname from Plumbum
• Supports ->mandatory from Plumbum
• More tests for help strings, improvements in formatting
• Support type and set syntax in positionals help strings
• Added help groups, with ->group("name") syntax
• Added initial support for ini file reading with add_config option.
• Supports GCC 4.7 again
• Clang 3.5 now required for tests due to googlemock usage, 3.4 should still work otherwise
• Changes setup for an explicit help bool in constructor/add_subcommand

Version 0.2: Leaner and meaner

• Moved to simpler syntax, where Option pointers are returned and operated on
• Removed make_ style options
• Simplified Validators, now only requires ->check(function)
• Removed Combiners
• Fixed pointers to Options, stored in unique_ptr now
• Added Option_p and App_p, mostly for internal use
• Startup sequence, including help flag, can be modified by subclasses

Version 0.1: First release

First release before major cleanup. Still has make syntax and combiners; very clever syntax but not the best or most commonly expected way to work.