v2.4.0: Improved error message for missing required flags: now list all missi…

…ng required flags for better user guidance. (#340)

Issue: https://github.com/alecthomas/kingpin/issues/215

v1.3.4

Since v1.2.0:

• Support "--" for separating flags from positional arguments.
• Support loading flags from files (ParseWithFileExpansion()). Use @file as an argument.
• Add post-app and post-cmd validation hooks. This allows arbitrary validation to be added.
• A bunch of improvements to help usage and formatting.
• Support arbitrarily nested sub-commands.

Fix parsing of flags in subcommands

Flags in two or deeper subcommands were not being parsed.

Subcommands and smarter help

v1.3.0

Reintroduce (much better) help and --help.

Fix bug where argument parse errors were not reported

v1.2.3

Actually return argGroup parse errors :\

Error out on excess arguments

v1.2.2

Return an error if too many arguments are passed through.

Bug fix for Enum values

v1.2.1

Fix enum values.

Help improvements + more useful types

• Pass any value through to Strings() when final argument.
  Allows for values that look like flags to be processed.
• Allow --help to be used with commands.
• Support Hidden() flags.
• Parser for units.Base2Bytes
  type. Allows for flags like --ram=512MB or --ram=1GB.
• Add an Enum() value, allowing only one of a set of values
  to be selected. eg. Flag(...).Enum("debug", "info", "warning").

One major bug fix plus a few minor + added OpenFile()

• Fixed a bug (#6) where an invalid default value could prevent the application from starting. Bad.
• Fixed formatting issue (#5) where very long default values would result in unreadable output.
• Added OpenFile(flag, perm) for controlling how files are opened.

Stable release (v1.0.0)

First stable release. No breaking API changes in this major version.

• gopkg.in for versioning (import "gopkg.in/alecthomas/kingpin.v1")
• Support cumulative positional arguments.
• Return error rather than panic when there are fatal errors not caught by
  the type system. eg. when a default value is invalid.