Add option group support for help output#7
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Flags can now be organized under named group headings (e.g., "Global
Options:") via three mechanisms with clear precedence:
1. InGroup() option on FromStruct call (highest)
2. `group:"..."` tag on embedded struct field
3. `_ struct{} \`group:"..."\`` self-declaration inside a struct
Also adds FlagSet.Group() for programmatic use and extracts shared flag
rendering into WriteFlagHelp() to eliminate duplication between ShowHelp
and dispatcher.showCommandHelp.
phinze
approved these changes
Feb 11, 2026
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Summary
InGroup()option onFromStructcall (highest)group:"..."tag on embedded struct field_ struct{}group:"..."`` self-declaration inside a structFlagSet.Group()method for programmatic (non-struct) groupingWriteFlagHelp(), eliminating duplication betweenShowHelp()anddispatcher.showCommandHelp()Test plan
TestFromStructSelfDeclaredGroup—_ struct{}assigns group to all flagsTestFromStructWithGroup—InGroup()assigns group to all flagsTestFromStructEmbeddedGroupTag—grouptag on embedded struct assigns groupTestGroupPrecedence—InGroup()> embedded tag > self-declarationTestGroupHelpOutput— named groups render before default "Options:"TestGroupBackwardCompatibility— no groups = single "Options:" headingTestGroupMethodProgrammatic—Group()API works for non-struct usageTestGroupOrderPreserved— groups appear in insertion order, not alphabeticalTestShowHelpWithGroups— fullShowHelp()integration with groups