v1.7.0

Add nested subcommand support (sub-usage_t per command)

A usage_t may now declare `commands`: a declared-order vector of
{name, shared_ptr<usage_t>}. When the first positional argument matches a
command name, the rest of the command line is handed to that command's own
usage_t and parsed against ITS options (recursively - a sub-usage can have its
own commands). Global options before the command still parse against the parent.
A null entry is a raw passthrough: the command is recognised but its arguments
are left unparsed, retrievable via tail() (for wrapping foreign flag sets like
`docker run`).

shared_ptr keeps usage_t an aggregate, so designated-init (`.args = {...}`) still
works and the sub-usages are released with the parent - no destructor (which
would break the aggregate). args_t gains a default ctor for command usage_t's
whose args are filled on dispatch.

New API: commands member, subcommand()/sub()/tail(). Empty commands == the
previous single-level behaviour, bit for bit (verified). Example + README updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ax7adsbWbibrSvpAGr7DTJ

v1.6.1

1.6.1: ordered options, aligned help, version spacing

Three fixes to usage/help composition:

- options are listed in their declared order. Since 1.5.0 `options` was a
  std::unordered_map (to drop the tsl::ordered_map dependency) with a "reverse
  iterate to keep order" routine, but unordered_map has no insertion order, so
  help listed options in hash order. options is now an ordered
  std::vector<std::pair<std::string, option_t>>.
- the description column is aligned by measuring the widest rendered option
  first, then padding. The previous up-front width miscounted the key-column
  padding, so long options ran straight into their descriptions.
- the program name is no longer followed by a stray space when version_title
  starts on a new line (title()/version()).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.6.0

release 1.6.0: docs, example version, CI

- document positional-argument / remainder handling (options may appear before,
  after or between positionals; `--` ends option parsing)
- bump example + README version strings to 1.6.0
- CI: checkout@v5, push/pull_request triggers, drop the unused submodule step;
  release workflow uses create-release-action@v2 / upload-recursive-asset-action@v2
  (aligned with the splash-drm workflows)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.5.0

Release v1.5.0

This release makes usage_cpp independent from other submodules and some minor changes.

 - instead of tsl::ordered_map, use std::unordered_map
 - created static functions for manipulating strings to break out from common_cpp depency
 - implemented `map_contains` since unordered_map does not have `contains`
 - implemented a routine to reverse iterater unordered_map to keep initialized order of options
 - remove submodule common_cpp depency

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.4.1

Release v1.4.1

minor changes:
 - improve usage_t::help(), fix some indents

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.4.0

Release v1.4.0

Release v1.4.0 is improvement release.
New features include:

 - support for "remainder" options/arguments which
   works similarly as it does with getopt. Optionally,
   you can use option "--" to stop parsing and put
   rest of command-line options to remainder.
   Remainder is available for user via remainder() function
   of usage_t class.
 - Options and arguments are now parsed once during construction
   of usage_t.
 - separator = is now supported, for example in example program,
   you can use `--age 10` or `--age=10` to archieve same result.
 - arguments for option can now be set to either not used, required
   or optional.
 - minimal argument validation is now supported for following types:
   bool, integer, float, string, hex
 - info structure has now even more detail.
 - default function for reporting parsing errors, is now present

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.3.0

version bump

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.2.0

Release v1.2.0

Some general improvements and better example

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.1.0

Release v1.1.0

This release add version_info()

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>

v1.0.1

Release v1.0.1

 - some fine tuning

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>