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Changelog

Unreleased

5.0.2

Changed

  • Update Kotlin to 2.1.0

5.0.1

Added

  • Added completion commands for suspending and chained commands. (#553)
  • Added no-op suspending commands. (#554)

Changed

  • Unknown option errors and missing argument errors that occur at the same time will now both be reported. (#553)

5.0.0

Added

  • Publish iosArm64 and iosX64 targets.
  • Added NoSuchArgument exception that is thrown when too many arguments were given on the command line. Previously, a less specific UsageError was thrown instead.
  • Added CommandLineParser.tokenize that splits a string into argv tokens.
  • Added CommandLineParser that provides functions for parsing and finalizing commands manually for more control.
  • Added Context.invokedSubcommands that contains all subcommands of the current command that are going to be invoked when allowMultipleSubcommands is true.
  • Added SuspendingCliktCommand that has a suspend fun run method, allowing you to use coroutines in your commands.
  • Added ChainedCliktCommand that allows you to return a value from your run method and pass it to the next command in the chain.
  • Added Context.data as an alternative to obj that allows you to store more than one object in the context.
  • Added Context.echoer to customize how echo messages are printed.
  • Added CompletionGenerator to manually generate completions for a command.
  • Added Context.exitProcess which you can use to prevent the process from exiting during tests.
  • Added core module that supports watchOS, tvOS, and wasmWasi targets and has no dependencies.
  • Added more options to CliktCommand.test to control the terminal interactivity. (#517)
  • Added associate{}, associateBy{}, and associateWith{} transforms for options that allow you to convert the keys and values of the map. (#529)
  • Added support for aliasing options to other options. (#535)
  • Added limit and ignoreCase parameters to option().split(). (#541)
  • Support calling --help on subcommands when parents have required parameters.

Changed

  • In a subcommand with and an argument() with multiple() or optional(), the behavior is now the same regardless of the value of allowMultipleSubcommands: if a token matches a subcommand name, it's now treated as a subcommand rather than a positional argument.

  • Due to changes to the internal parsing algorithm, the exact details of error messages when multiple usage errors occur have changed in some cases.

  • Breaking Change: Moved the following parameters from CliktCommand's constructor; override the corresponding properties instead:

    removed parameter replacement property
    help fun help
    epilog fun helpEpilog
    invokeWithoutSubcommand val invokeWithoutSubcommand
    printHelpOnEmptyArgs val printHelpOnEmptyArgs
    helpTags val helpTags
    autoCompleteEnvvar val autoCompleteEnvvar
    allowMultipleSubcommands val allowMultipleSubcommands
    treatUnknownOptionsAsArgs val treatUnknownOptionsAsArgs
    hidden val hiddenFromHelp

  • The following methods on CliktCommand have been renamed: commandHelp -> help, commandHelpEpilog -> epilog. The old names are deprecated.

  • Breaking Change: CliktCommand.main and CliktCommand.parse are now extension functions rather than methods.

  • Breaking Change: Context.obj and Context.terminal, and OptionTransformContext.terminal are now extension functions rather than properties.

  • Breaking Change: The RenderedSection and DefinitionRow classes have moved to AbstractHelpFormatter.

  • Markdown support in the help formatter is no longer included by default. To enable it, include the :clikt-markdown dependency and call yourCommand.installMordantMarkdown() before parsing.

  • Updated Kotlin to 2.0.0

Fixed

  • Fixed excess arguments not being reported when allowMultipleSubcommands=true and a subcommand has excess arguments followed by another subcommand.
  • Commands with printHelpOnEmptyArgs=true will no longer print help if an option has a value from an environment variable or value source. (#382)

Deprecated

  • Deprecated Context.originalArgv. It will now always return an empty list. If your commands need an argv, you can pass it to them before you run them, or set in on the new Context.data map.
  • Deprecated Context.expandArgumentFiles. Use Context.argumentFileReader instead.
  • Renamed the following Context fields to be more consistent. The old names are deprecated.
old name new name
Context.envvarReader Context.readEnvvar
Context.correctionSuggestor Context.suggestTypoCorrection
Context.argumentFileReader Context.readArgumentFile
Context.tokenTransformer Context.transformToken

Removed

  • Removed previously deprecated experimental annotations.
  • Removed MordantHelpFormatter.graphemeLength
  • Removed TermUi

4.4.0

Added

  • Publish linuxArm64 and wasmJs targets.

4.3.0

Added

  • Added limit parameter to option().counted() to limit the number of times the option can be used. You can either clamp the value to the limit, or throw an error if the limit is exceeded. (#483)
  • Added Context.registerClosable and Context.callOnClose to allow you to register cleanup actions that will be called when the command exits. (#395)

Fixed

  • Fixed unrecognized modifier 'i' that happened on tab-completion when using sub command aliases. Thanks to @hick209 for the contribution. (#500)
  • Make sure auto complete script works on zsh, fixing the error complete:13: command not found: compdef. Thanks to @hick209 for the contribution. (#499)

4.2.2

Changed

  • Options and arguments can now reference option groups in their defaultLazy and other finalization blocks. They can also freely reference each other, including though chains of references. (#473)
  • Updated Kotlin to 1.9.21 (#472)

4.2.1

Added

  • Added toString implementations to options and arguments. (#434)
  • Added CliktCommand.test overload that takes a vararg of Strings as the command line arguments. Thanks to @sschuberth for the contribution (#451)

Fixed

  • Update Mordant dependency to fix crashes on native targets and GraalVM (#447)

4.2.0

Added

  • Added requireConfirmation parameter to option().prompt() (#426)
  • Added CliktCommand.terminal extension for accessing the terminal from a command.
  • Added includeSystemEnvvars, ansiLevel, width, and height parameters to all CliktCommand.test overloads.

Deprecated

  • Deprecated CliktCommand.prompt, use CliktCommand.terminal.prompt or Prompt instead.
  • Deprecated CliktCommand.confirm, use YesNoPrompt instead.

Fixed

  • Fixed incorrect error message when a defaultLazy option referenced a required option. (#430)

4.1.0

Added

  • Added MordantHelpFormatter.renderAttachedOptionValue that you can override to change how option values are shown, e.g. if you want option to show as --option <value> instead of --option=<value>. (#416)
  • Added option().optionalValueLazy{}, which work like optionalValue() but the default value is computed lazily. (#381)

Changed

  • Updated Kotlin to 1.9.0
  • PrintMessage, PrintHelpMessage and PrintCompletionMessage now default to exiting with a status code 0, which is the behavior they had in 3.x. (#419)

4.0.0

Added

  • Added Context.errorEncountered which is true if parsing has continued after an error was encountered.
  • option().help{""} and argument().help{""} extensions that set the parameter's help text lazily, with access to the current context so that you can add colors.

Changed

  • Option.optionHelp and Argument.argumentHelp, CliktCommand.commandHelp, and CliktCommand.commandHelpEpilog are now methods that take the context as an argument, and the help parameter to copy is now a helpGetter lambda. CliktCommand.shortHelp now takes the context as an argument.
  • The message method on TransformContext interfaces is now an extension.

Deprecated

  • Deprecated CliktCommand.commandHelp and commandHelpEpilog properties in favor of the methods with the same name.

4.0.0-RC

Added

  • You can now use markdown in your help strings, including tables and lists. Clikt uses the Mordant library for rendering.
  • Help output and error messages now include colors by default. You can disable this or customize the styling by configuring the context.terminal
  • Added Option.varargValues() to create an option that accepts a variable number of values
  • Added Option.optionalValue() to create an option whose value is optional.
  • Added obj setter to context builder as an alternative to currentContext.obj
  • Added boolean() parameter type conversions.
  • Added uint() and ulong() parameter type conversions.
  • Added nullableFlag() parameter transformation.
  • Added CliktCommand.test extension for testing your commands and their output
  • Clikt will now report multiple errors if they occur via the new MultiUsageError exception, rather than just reporting the first error. (#367)
  • Added CliktCommand.allHelpParams(), which can be overridden to change which parameters are displayed in help output
  • Added Context.argumentFileReader which allows custom loading of argument files
  • Added Context.allowGroupedShortOptions which can disable parsing -abc as -a -b -c
  • Options named -? or /? are now supported
  • Added option(eager=true) to create an eager option that takes values
  • Added option(acceptsUnattachedValue=false) to force the option to only accept values like --option=1 and not --option 1
  • Added CliktCommand.test() that captures the output of a command and does not exit the process.

Removed

  • Removed CliktConsole. Mordant is now used for all input and output. If you were defining a custom console, instead define a mordant TerminalInterface and set it on your context's Terminal.
  • Removed TermUi.echo, TermUi.prompt, and TermUi.confirm. Use the equivalent methods on your CliktCommand, or use mordant's prompts directly.
  • Removed legacy JS publications. Now only the JS/IR artifacts are published.
  • Removed CliktHelpFormatter. Use MordantHelpFormatter instead.
  • Removed FlagOption and EagerOption classes. All options are now implemented as transformations on OptionWithValues. FlagOption is now OptionWithValues<Boolean, Boolean, Boolean>.

Changed

  • prompt and confirm are now implemented with mordant's prompt functionality, and the method parameters have changed to match mordant's
  • When using treatUnknownOptionsAsArgs, grouped short options like -abc will be treated as an argument rather than reporting an error as long as they don't match any short options in the command. (#340)
  • Clikt no longer automatically calls trimIndent on strings passed to help. Call trimIndent or trimMargin yourself if necessary.
  • Context.Builder.helpOptionNames now accepts any iterable rather than just a set.
  • CliktCommand.echo and prompt are now public. (#407)
  • Internally, all options are implemented transformations on OptionWithValues, rather than using separate classes for each option type.
  • Some Localization strings have changed, removed Localization.aborted(), added Localization.argumentsMetavar()
  • Context.Builder.helpFormatter is now a lambda that takes the current context as an argument
  • Exceptions have been reworked so that all exceptions thrown by Clikt are subclasses of CliktError.
  • CliktError now includes statusCode and printError properties.
  • The constructor of UsageError and its subclasses no longer takes a context parameter. The context is now inferred automatically.
  • UsageError.formatUsage now takes the localization and formatter as arguments

Fixed

  • When parsing a command line with more than one error, Clikt will now always report the error that occurs earliest if it can't report them all (#361)
  • When treatUnknownOptionsAsArgs is true, grouped unknown short options will now be treated as arguments rather than reporting an error.

3.5.4

Fixed

  • Revert jvm jars to target Java 8

3.5.3

Changed

  • Updated Kotlin to 1.8.22

Fixed

  • Context is now set properly on NoSuchOption exceptions when thrown from subcommands. (#399)
  • When treatUnknownOptionsAsArgs is true, grouped unknown short options will now be treated as arguments rather than reporting an error.

3.5.2

Changed

  • Updated Kotlin to 1.8.10

Fixed

  • Fix CliktCommand.prompt on NodeJS targets that would hang due to KT-55817 (#387)

3.5.1

Changed

  • Updated Kotlin to 1.7.20

Fixed

  • Support unicode in environment variable values on Native Windows. (#362)
  • Support environment variables for options in a mutually exclusive options group. (#384)

3.5.0

Added

  • Added hidden parameter to CliktCommand, which will prevent the command from being displayed as a subcommand in help output (#353)
  • Publish artifacts for the macosArm64 target. Note that this target is not tested on CI. (#352)

Changed

  • Default values for arguments will now be included in help output when showDefaultValues=true is set on your help formatter (#357)

Fixed

  • Fix flags and other options with defaults not being usable in mutuallyExclusiveOptions (#349)
  • Fix CompletionCommand generating completion for itself (#355)

3.4.2

Deprecated

  • TermUi.echo, TermUi.prompt, and TermUi.confirm. Use the equivalent methods on CliktCommand instead. (#344)

3.4.1

Added

  • Added obj setter to context builder as an alternative to currentContext.obj
  • Added option().boolean() and argument().boolean()
  • uint() and ulong() parameter type conversions.
  • CliktCommand.test extension for testing your commands and their output

Changed

  • Updated Kotlin to 1.6.20

3.4.0

Changed

  • unique() now works with any option with a list type, not just multiple() options (#332)
  • Updated Kotlin to 1.6.10

Fixed

  • Fixed co-occurring option groups returning null when all options in the group are defined in environment variables (#330)

3.3.0

Added

  • Added default parameter to argument().multiple() (#305)
  • Context.originalArgv that allows you to read the command line arguments from within a command's run (#290)
  • context { envarReader = {...} } to set a custom function to read from environment variables (#299)

Changed

  • defaultLazy values can now reference other parameters, as long the referenced parameters do not also reference other parameters
  • You can now call CliktCommand.context multiple times on the same command, and all builder blocks will be applied
  • Validate values entered to a prompt option, and show another prompt if the validation fails (#288)
  • Updated kotlin to 1.5.31

Fixed

  • Report error when excess arguments are given to a command with allowMultipleSubcommands=true (#303)

3.2.0

Added

  • InputStream.isCliktParameterDefaultStdin and OutputStream.isCliktParameterDefaultStdout to check if the streams returned from inputStream/outputStream options are proxying stdin/stdout (#272)

Changed

  • Make parameters of mutuallyExclusiveOptions covariant to allow validation without explicit type annotations. (#265)
  • Updated kotlin to 1.5.0

Fixed

  • Reading from an option or argument property on a command that hasn't been invoked will now always throw an IllegalStateException

3.1.0

Added

  • Added required() and defaultLazy() for nullable flag options like switch(). (#240)
  • Added support for generating autocomplete scripts for Fish shells (#189)
  • Added CompletionCommand and CliktCommand.completionOption() that will print an autocomplete script when invoked, as an alternative to using environment variables.

Changed

  • Updated Kotlin to 1.4.21
  • @argfiles now allow line breaks in quoted values, which are included in the value verbatim. You can now end lines with \ to concatenate them with the following line. (#248)

3.0.1

Deprecated

  • Deprecated calling echo with err or lineSeparator but no message.

3.0.0

Added

  • Clikt's JS target now supports both NodeJS and Browsers. (#198)
  • Default values for switch options are now shown in the help. Help text can be customized using the defaultForHelp argument, similar to normal options. (#205)
  • Added FlagOption.convert (#208)
  • Added ability to use unicode NEL character (\u0085) to manually break lines in help output (#214)
  • Added help("") extension to options and arguments as an alternative to passing the help as an argument (#207)
  • Added valueSourceKey parameter to option
  • Added check() extensions to options and arguments as an alternative to validate()
  • Added prompt and confirm functions to CliktCommand that call the TermUi equivalents with the current console.
  • Added echo() overload with no parameters to CliktCommand that prints a newline by itself.
  • Added localization support. You can set an implementation of the Localization interface on your context with your translations. (#227)

Fixed

  • Hidden options will no longer be suggested as possible typo corrections. (#202)
  • Options and Arguments with multiple(required=true) will now show as required in help output. (#212)
  • Multiple short lines in a help text paragraph no longer appear dedented (#215)

Changed

  • Updated Kotlin to 1.4.0
  • Argument.help and Option.help properties have been renamed to argumentHelp and optionHelp, respectively. The help parameter names to option() and argument() are unchanged.
  • commandHelp and commandHelpEpilog properties on CliktCommand are now open, so you can choose to override them instead of passing help and epilog to the constructor.
  • Replaced MapValueSource.defaultKey with ValueSource.getKey(), which is more customizable.
  • Option.metavar, Option.parameterHelp, OptionGroup.parameterHelp and Argument.parameterHelp properties are now functions.
  • Changed constructor parameters of CliktHelpFormatter. Added localization and removed usageTitle, optionsTitle, argumentsTitle, commandsTitle, optionsMetavar, and commandMetavar. Those strings are now defined on equivalently named functions on Localization.

Removed

  • Removed envvarSplit parameter from option() and convert(). Option values from environment variables are no longer split automatically. (#177)
  • Removed public constructors from the following classes: ProcessedArgument, OptionWithValues, FlagOption, CoOccurringOptionGroup, ChoiceGroup, MutuallyExclusiveOptions.
  • MissingParameter exception replaced with MissingOption and MissingArgument
  • Removed Context.helpOptionMessage. Override Localization.helpOptionMessage and set it on your context instead.

Deprecated

  • @ExperimentalCompletionCandidates and @ExperimentalValueSourceApi annotations. These APIs no longer require an opt-in.

2.8.0

Added

  • Added error parameter to PrintMessage and PrintHelpMessage. When true, CliktCommand.main will exit with status code 1. (#187)

Changed

  • When printHelpOnEmptyArgs is true and no arguments are present, or when invokeWithoutSubcommand is false and no subcommand is present, CliktCommand.main will now exit with status code 1 rather than 0.
  • restrictTo now works with any Comparable value, not just Number.
  • CliktCommand.main now accepts Array<out String>, not just Array<String>. (#196)

Fixed

  • Fixed option values being reset when calling multiple subcommands with allowMultipleSubcommands=true (#190)

2.7.1

Fixed

  • Fixed NPE thrown in some cases when using defaultByName (#179)

2.7.0

Added

  • Ability to use custom program exit status codes via ProgramResult.
  • inputStream and outputStream conversions for options and arguments. (#157 and #159)
  • splitPair, toMap, and associate extensions on option. (#166)
  • treatUnknownOptionsAsArgs parameter to CliktCommand. (#152)
  • defaultByName function for groupChoice and groupSwitch options. (#171)

Changed

  • Update Kotlin to 1.3.71
  • Improved command name inference. Now, a class like MyAppCommand will infer its commandName as my-app rather than myappcommand. You can still specify the name manually as before. (#168)

Fixed

  • Correctly parse short options with attached values that contain =

2.6.0

Added

  • registeredSubcommands, registeredOptions, registeredArguments, and registeredParameterGroups methods on CliktCommand.
  • Ability to read default option values from configuration files and other sources. Support for Java property files is built in on JVM, see the json sample for an example of reading from other formats.
  • allowMultipleSubcommands parameter to CliktCommand that allows you to pass multiple subcommands in the same call. (docs)
  • Errors from typos in subcommand names will now include suggested corrections. Corrections for options and subcommands are now based on a Jaro-Winkler similarity metric, and can be customized with Context.correctionSuggestor

Changed

  • Update Kotlin to 1.3.70
  • convert can be called more than once on the same option or argument, including after calls to conversion functions like int and file.
  • CliktCommand.toString now includes the class name
  • Reverted automatic ~ expansion in file() and path() introduced in 2.5.0. If you need this behavior, you can implement it with code like convert { /* expand tidle */ }.file()

Deprecated

  • wrapValue is now deprecated, since convert can be used in its place instead.

2.5.0

Added

  • Clikt is now available as a Kotlin Multiplatform Project, supporting JVM, NodeJS, and native Windows, Linux, and macOS.
  • eagerOption {} function to more easily register eager options.
  • Eager options can now be added to option groups in help out by passing a value for groupName when creating them.
  • canBeSymlink parameter to file() and path() conversions that can be used to disallow symlinks
  • CliktCommand.eagerOption to simplify creating custom eager options

Changed

  • The parameter names of file() and path() conversions have changed. The existing names are deprecated, and can be converted to the new usages with an IntelliJ inspection. Note that if you are calling these functions with unnamed arguments (e.g. file(true, false)), you'll need to add argument names in order to remove the deprecation warning.

Deprecated

  • The CliktCommand.context property has been deprecated in favor of the new name, currentContext, to avoid confusion with the CliktCommand.context{} method.
  • NoRunCliktCommand was renamed to NoOpCliktCommand. The existing class is deprecated. (#130)

Fixed

  • file() and path() conversions will now properly expand leading ~ in paths to the home directory for mustExist, canBeFile, and canBeDir checks. The property value is unchanged, and can still begin with a ~. (#131)

2.4.0

Added

  • CompletionCandidates.Fixed now has a secondary convenience constructor that take a vararg of Strings
  • CompletionCadidates.Custom, which allows you to call other binaries or write a script to generate completions. This class is currently experimental. (#79)
  • Option.wrapValue and Argument.wrapValue to make it easier to reuse existing conversion functions.
  • ignoreCase parameter to choice() and enum() conversion functions.

Changed

  • option() and argument() now take optional completionCandidates parameters to override how completion is generated. The constructor and copy functions of OptionsWithValues and ProcessedArgument have changed to support default values.
  • The overloads of findObject (1 2) that take a default value have been renamed findOrSetObject. The existing names are marked with @Deprecated, and IntelliJ can convert your call sites automatically. (#110)
  • enum() parameters now accept case-insensitive values by default. You change this behavior by passing ignoreCase = false to enum() (#115)

Fixed

  • groupChoice help output now includes the choices in the help output metavar
  • TermUi.edit* functions could freeze on certain editors (#99, thanks @iampravikant and @sebokopter)
  • Shell completion can now handle command names with dashes. (#104)
  • Arguments with = in them could be incorrectly interpreted as options (#106)

2.3.0

Added

  • option().groupSwitch(), which works like groupChoice(), but uses a switch() option rather than a choice() option.
  • UsageError now has a statusCode parameter (which defaults to 1). If you're using ClicktCommand.main, the value of statusCode will be passed to exitProcess.

Changed

  • Shell completion code is now printed by throwing a PrintCompletionMessage (a subclass of PrintMessage) rather than calling echo directly.

2.2.0

Added

Changed

Fixed

  • Help output missing items when no help text is specified. (#85)
  • Help output not grouping options in groups passed to groupChoice. (#88)

2.1.0

Added

  • Ability to prevent rewrapping individual paragraphs in help output.
  • Added parameter required to Option.multiple() to require at least one instance of the option on the command line.

Changed

  • CliktCommand.toString() now includes the names and values of all parameters and subcommands.

Fixed

  • Create subcommand context when helpOptionNames is empty. (#64)

2.0.0

Added

Changed

  • If multiple -- tokens are present on the command line, all subsequent occurrences after the first are now parsed as positional arguments. Previously, subsequent -- tokens were skipped.
  • The PlaintextHelpFormatter has been replaced with CliktHelpFormatter, which is more customizable. See the docs for more info, or the new sample for an example of customizing help output to use ANSI colors.
  • Some of the properties and constructor parameters for OptionWithValues and ProcessedArgument have changed.
  • The OptionDelegate interface has changed, and GroupableOption and ParameterHolder interfaces have been added to work with option groups.
  • Parameter validation now occurs after all parameter delegates have set their values, so the lambdas passed to validate may reference other parameters.

1.7.0

Added

  • printHelpOnEmptyArgs parameter to CliktCommand constructor. (#41)

Fixed

  • Usage errors now correctly print subcommand names. (#47)
  • Arguments with multiple(required=true) now report an error if no argument is given on the command line. (#36)

1.6.0

Added

  • .multiple().unique() modifier for options and arguments.

Fixed

  • Support multi-line input when redirecting stdin

1.5.0

Added

  • Ability to use alternate output streams rather than stdin and stdout by setting Context.console or by passing a console to TermUI functions.

1.4.0

Added

  • path() type for parameter values

Changed

  • Clikt now targets JVM 8 bytecode
  • Responses to TermUi.confirm() are now case-insensitive

1.3.0

Added

  • defaultLazy extension for options and arguments

Changed

  • main now prints messages to stderr instead of stdout

Fixed

  • Parameter help messages are now wrapped more consistently

1.2.0

Added

  • Default parameter to option().default()

Changed

  • Treat tokens with unknown prefixes as arguments (this makes it easier to pass in file paths without using --).

1.1.0

Added

  • List<String> overloads to CliktCommand.parse and main
  • err parameter to TermUi.echo
  • error property to Abort