kc3-lang/libxkbcommon/tools/xkbcli-bash-completion.sh

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• Hash : d826d70b
  Author :
  Date : 2023-11-07T12:58:36
  

  xkbcli: Fix bash completion `compgen` expect command options list formatted as a newline-separated list. Add a missing newline when concatenating two lists.

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• tools/xkbcli-bash-completion.sh

• # 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
  

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