# Functions
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HandlePluginCommand receives a pluginHandler and command-line arguments and attempts to find a plugin executable on the PATH that satisfies the given arguments.
IsSubcommandPluginAllowed returns the given command is allowed to use plugin as subcommand if the subcommand does not exist as builtin.
NewDefaultPluginHandler instantiates the DefaultPluginHandler with a list of given filename prefixes used to identify valid plugin filenames.
# Structs
DefaultPluginHandler implements PluginHandler.
# Interfaces
PluginHandler is capable of parsing command line arguments and performing executable filename lookups to search for valid plugin files, and execute found plugins.