ssh completion snippet: host aliases from the configuration file

[Hannu Koivisto <azure@iki.fi>]

Greetings,

I modified ssh completion to dig host aliases from the
configuration file.  I don't use wildcards in host patterns or give
multiple patterns, so this doesn't attempt to handle such cases.  I
also have no idea whether this modification is otherwise well
written or not; I'm still a beginner in completion hacking.  All
comments appreciated.

I think that a well written version (one that handles multiple
patterns and patterns with wildcards, among the other issues) of
the same subject would be nice as a standard feature.  One might
also want to utilize hosts from the known_hosts file.

_ssh_hosts () {
  if [[ "$IPREFIX" == *@ ]]; then
    _combination -s '[:@]' my-accounts users-hosts "users=${IPREFIX/@}" hosts "$@"
  else
    _combination -s '[:@]' my-accounts users-hosts \
      ${opt_args[-l]:+"users=${opt_args[-l]:q}"} hosts "$@"
  fi
  if [[ -r "$HOME/.ssh/config" ]]; then
      local IFS=" 	" key host
      while read key host; do
          if [[ "$key" == (#i)host ]]; then
              _wanted hosts expl host \
                  compadd -M 'm:{a-zA-Z}={A-Za-z} r:|.=* r:|=*' "$@" "$host"
          fi
      done < "$HOME/.ssh/config"
  fi
}

-- 
Hannu