Support tab-completion for bash and other shells

[hirak99]

[SJFCS]

zsh can use this

# _yabsnap.zsh
# This function provides tab completion for the yabsnap command.

_yabsnap() {
  local -a commands
  commands=(
    'list:List all managed snaps'
    'list-json:Machine readable list of all managed snaps'
    'create:Create new snapshots'
    'create-config:Bootstrap a config for new filesystem to snapshot'
    'delete:Delete a snapshot created by yabsnap'
    'rollback-gen:Generate script to rollback one or more snaps'
  )

  local -a options
  options=(
    '-h[Show help message]'
    '--help[Show help message]'
    '--sync[Wait for btrfs to sync for any delete operations]'
    '--config-file[Specify a config file to use]'
    '--source[Restrict to config with this source path]'
    '--dry-run[Disable all snapshot creation and deletion]'
    '--verbose[Sets log-level to INFO]'
  )

  # Complete commands
  if [[ $words[1] == "yabsnap" ]]; then
    _describe -t commands 'yabsnap command' commands
    return
  fi

  # Complete options for the commands
  if [[ $words[1] == "yabsnap" && $words[2] ]]; then
    _describe -t options 'yabsnap option' options
  fi
}

# Register the completion function
compdef _yabsnap yabsnap

[hirak99]

Yabsnap now has a moderately complex set of inter related arguments. I think the best way to have an auto-complete system is to actually use Yabsnap's code. I will see if I can generate completions from the code itself.

The template above is helpful.