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Tools: Add bash completions for xkbcli
- Add bash completion script. It 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. - Add installation entry in Meson. The path can be configured using the option `bash-completion-path`; it will default to: `share/bash-completion/completions`. TODO: completion for other shells?
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,97 @@ | ||
| # bash completion support for xkbcli. | ||
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| # 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. | ||
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| ___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 | ||
| _init_completion -s || return | ||
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| local i=1 cmd | ||
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| # Find subcommand | ||
| while [[ "$i" -lt "$COMP_CWORD" ]] | ||
| do | ||
| local s="${COMP_WORDS[i]}" | ||
| case "$s" in | ||
| -*) ;; | ||
| *) | ||
| cmd="$s" | ||
| break | ||
| ;; | ||
| esac | ||
| (( i++ )) | ||
| done | ||
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| # Parse available subcommands | ||
| local help_output line is_command_list=false subcommands=() | ||
| help_output=$(xkbcli --help) | ||
| 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 [[ "$line" == "Commands:" ]]; then | ||
| is_command_list=true | ||
| fi | ||
| done <<< "$help_output" | ||
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| # 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 | ||
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| # Found a supported subcommand: proceed to completion | ||
| if [[ " ${subcommands[*]} " =~ " $cmd " ]] | ||
| then | ||
| ___xkbcli_subcommand "$cmd" | ||
| fi | ||
| } | ||
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| ___xkbcli_subcommand() | ||
| { | ||
| # Some special cases | ||
| case $1 in | ||
| compile-keymap | interactive-evdev) | ||
| case ${COMP_WORDS[COMP_CWORD-1]} in | ||
| --include | --keymap) | ||
| _filedir | ||
| return;; | ||
| esac | ||
| ;; | ||
| list) | ||
| if [[ ${COMP_WORDS[COMP_CWORD]} != -* ]]; then | ||
| _filedir | ||
| return | ||
| fi | ||
| ;; | ||
| esac | ||
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| # Parse help to get command options | ||
| local opts | ||
| # Doc for _parse_usage & _parse_help: | ||
| # • https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L335 | ||
| # • https://github.com/scop/bash-completion/blob/fdf4456186eb4548ef628e65fb1be73d8e4695e9/bash_completion.d/000_bash_completion_compat.bash#L311 | ||
| opts=$(_parse_usage xkbcli "$1 --help") | ||
| opts+=$(_parse_help xkbcli "$1 --help") | ||
| local cur="${COMP_WORDS[COMP_CWORD]}" | ||
| COMPREPLY=($(compgen -W "$opts" -- "$cur")) | ||
| } | ||
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| complete -F ___xkbcli_main xkbcli |
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