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#!/usr/bin/env bash

# Translate a word from English to German and vice versa.  I don't know how to invoke
# `dict` specifying more than one database to search (exception: searching all available
# databases is no problem), so this functions runs `dict` twice: once for "eng-deu" and
# once for "deu-eng".  Then, the output is processed to make it look like a normal
# invocation of `dict` in all cases.
#
# Tests passed: `t curious`, `t du`, `t la`, `t treee`, `t lassso`, `t kindergarten`,
# `t haus`, `t nun`.

output=$(dict -d eng-deu -- "$1" 2>&1)
status=$?
other_output=$(dict -d deu-eng -- "$1" 2>&1)
other_status=$?
# See https://mywiki.wooledge.org/BashFAQ/002.
if [[ $status -eq 0 && $other_status -eq 0 ]]; then
   # Both commands succeeded (should happen for `t kindergarten`, for example).
   # Merge the "definition found" lines.
   declare -i definition_count # Using `declare` also renders variables local.
   definition_count=${output%% *}
   definition_count+=${other_output%% *}
   echo "$definition_count definitions ${output#* * }"
   # See https://wiki.bash-hackers.org/syntax/pe.
   # Remove the top line.
   echo "$other_output" | tail -n +2
elif [[ $status -eq 0 ]]; then
   # Only the first lookup succeeded.
   echo "$output"
elif [[ $other_status -eq 0 ]]; then
   # Only the second lookup succeeded.
   echo "$other_output"
else
   # SNAFU.
   if [[ $other_output = *'perhaps you mean'* ]]; then
      echo "$other_output" | head -n 1
   else
      echo "$output" | head -n 1
   fi
   echo "$output" | tail -n +2
   echo "$other_output" | tail -n +2
fi