This directory helpers is the place to put third-party helper scripts
that are used by third-party completion files in the completions directory,
written for bash-completion.
Note
The core bash-completion framework (<= 2.17) has provided also helper
scripts included in the bash-completion framework itself in this directory,
but we separated those files into helpers-core. However, external
completion provider should continue to install their helper scripts in
helpers. The new directory helpers-core is an internal directory
intended to be used by the core bash-completion.
The helper script may be referenced by a completion script in completions
with ${BASH_COMPLETION[0]%/*}/../helpers/<helper>.