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completion-gem
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completion-gem
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#! bash
# bash completion for the `gem` command.
#
# Copyright (c) 2009-2021 Daniel Luz <dev dot gsz at mernen dot com>.
# Distributed under the MIT license.
# https://mernen.com/projects/completion-ruby
#
# To use, source this file on bash:
# . completion-gem
__gem() {
local gem_bin=("${_RUBY_COMMAND_PREFIX[@]}" "$1")
local cur=$2
local prev=$3
COMPREPLY=()
local gem_command
__gem_get_command
[[ $gem_command = i ]] && gem_command=install
# Can't do anything with non-commands
[[ $gem_command = - ]] && return
if [[ $prev = --config-file ]]; then
# Leave COMPREPLY blank, let the default handle it
return
elif [[ $prev = --*dir || ${COMP_WORDS[$COMP_CWORD]} = --*dir=* ]]; then
# Assume any option ending in 'dir' takes a directory name
type -t _filedir >/dev/null && _filedir -d
return
fi
local choices
if [[ $cur = -* ]]; then
case $gem_command in
"")
choices="-h --help -v --version";;
*)
choices=$(__gem_command_options "$gem_command")
esac
else
case $gem_command in
"")
choices=$(__gem_available_commands);;
help)
choices="commands examples platforms $(__gem_available_commands)";;
build)
if type -t _filedir >/dev/null; then
if [[ $prev = -C ]]; then
_filedir -d
else
_filedir gemspec
fi
fi
return;;
install)
if type -t _filedir >/dev/null; then
if [[ $prev = -i || $prev = -n || $prev = --build-root || ${COMP_WORDS[$COMP_CWORD]} = --build-root=* ]]; then
_filedir -d
else
_filedir gem
fi
fi
return;;
uninstall | cleanup)
choices=$(__gem_installed_gems);;
push)
type -t _filedir >/dev/null && _filedir gem
return;;
esac
fi
COMPREPLY=($(compgen -W "$choices" -- "$cur"))
}
# Stores in $gem_command the name of the gem command currently in use.
# If no command is found, the variable is not set.
__gem_get_command() {
local i
for ((i=1; i < $COMP_CWORD; ++i)); do
local arg=${COMP_WORDS[$i]}
case $arg in
-h | --help | -v | --version | --)
# These options are command-killers
gem_command=-
return;;
--config-file)
# Skip argument
((++i));;
[^-]*)
gem_command=$arg
# Keep scanning; if a "--" is found, treat the command as finished
for ((++i; i < $COMP_CWORD; ++i)); do
if [[ ${COMP_WORDS[$i]} = -- ]]; then
gem_command=-
return
fi
done
return;;
esac
done
}
# Outputs a list of installed gems, one per line.
__gem_installed_gems() {
"${gem_bin[@]}" list --local --no-details 2>/dev/null | awk '/^[^ ]+ \(/ { print $1 }'
}
# Outputs a list of available commands, one per line.
__gem_available_commands() {
"${gem_bin[@]}" help commands 2>/dev/null | awk '/^ [^ ]/ { print $1 }'
}
# Performs `gem help $1`, scans output for options, emits them one per line.
__gem_command_options() {
# gem help output starts option sections with a header like
# " Common Options:", followed by lines indented with at least
# four spaces, one or more forms for the same option, a couple
# alignment spaces, and a description.
# We assume a header that doesn't mention "Options" denotes the
# end of the list of options.
# Also, some options come with optional parts, like "--[no-]ri";
# we first emit the version with these parts included, then omit
# them.
"${gem_bin[@]}" help "$1" 2>/dev/null |
ruby -ne '
if /^ (\S.*):/
exit unless $1.include? "Options"
elsif /^ {4,}((?:-[-\w\[\],]+ )+)/
$1.gsub(",", " ").split.each do |opt|
# Print option with optional parts
puts opt.gsub(/[\[\]]/, "")
# Print also version w/o optionals if available
opt.gsub!(/\[[^\]]+\]/, "") and puts opt
end
end' 2>/dev/null
}
complete -F __gem -o bashdefault -o default gem gem1.{8..9} gem2.{0..7} gem3.{0..3} jgem
# vim: ai ft=sh sw=4 sts=4 et