libxkbcommon/tools/xkbcli-bash-completion.sh

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# bash completion support for xkbcli.
# See completion API documentation: https://github.com/scop/bash-completion
# NOTE: The script parses the commands help messages to provide the completions,
# thus any new subcommand or option will be supported, as long as it has its
# entry in the help messages. This should result in low maintenancei effort.
___xkbcli_main()
{
# Initialization: https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L205
local cur prev words cword cmd
_init_completion -s || return
# Find subcommand
local i=1
while [[ "$i" -lt "$COMP_CWORD" ]]; do
local s="${COMP_WORDS[i]}"
case "$s" in
-*) ;;
*)
cmd="$s"
break
;;
esac
(( i++ ))
done
# Parse available subcommands
local line
local is_command_list=false
local subcommands=()
while IFS='' read -r line; do
# Traverse subcommand list
if [[ "$is_command_list" == true ]]; then
# Check for subcommand based on the indentation
if [[ "$line" =~ ^[[:blank:]]{2}([[:alpha:]]([[:alnum:]]|-)+)$ ]]; then
subcommands+=("${BASH_REMATCH[1]}")
# Detect end of subcommand list based on indentation
elif [[ "$line" =~ ^[[:graph:]] ]]; then
is_command_list=false
fi
# Detect start of subcommand list
elif [[ "$line" == "Commands:" ]]; then
is_command_list=true
fi
# NOTE: <( COMMAND ) Bash construct is “process substitution”.
done < <(xkbcli --help)
# No previous subcommand or incomplete: completion for root xkbcli command
if [[ "$i" -eq "$COMP_CWORD" ]]; then
local opts
# Doc for _parse_help: https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L311
opts=$(_parse_help xkbcli)
local cur="${COMP_WORDS[COMP_CWORD]}"
COMPREPLY=($(compgen -W "${subcommands[*]} $opts" -- "$cur"))
return
fi
# Found a supported subcommand: proceed to completion
if [[ "${subcommands[*]}" =~ (^| )$cmd( |$) ]]; then
___xkbcli_subcommand "$cmd"
fi
}
___xkbcli_subcommand()
{
# Some special cases
case $1 in
compile-keymap | interactive-evdev)
case ${COMP_WORDS[COMP_CWORD-1]} in
--include | --keymap)
_filedir
return;;
esac
;;
compile-compose)
case ${COMP_WORDS[COMP_CWORD-1]} in
--file)
_filedir
return;;
esac
;;
list)
if [[ ${COMP_WORDS[COMP_CWORD]} != -* ]]; then
_filedir
return
fi
;;
esac
# Parse help to get command options
local opts
# Doc for _parse_usage and _parse_help:
# • https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L335
# • https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L311
# We need both as the current help messages adopt both GNU and BSD styles.
opts=$(_parse_usage xkbcli "$1 --help")
opts+="
"
opts+=$(_parse_help xkbcli "$1 --help")
local cur="${COMP_WORDS[COMP_CWORD]}"
COMPREPLY=($(compgen -W "$opts" -- "$cur"))
}
complete -F ___xkbcli_main xkbcli