#!/bin/sh

# Translate given text passed via stdin with the help of DeepL. Expects the API
# token to be passed through the environment variable $DEEPL_API_TOKEN.
#
# The output is only the translated text if `jq` is installed, and the json
# response from DeepL otherwise.
#
# Assumes German as source language and English (US) as target language if not
# specified via the first two arguments.
#
# Can be simply used in vim:
#
#   :'<,'>!trans

ENDPOINT='https://api-free.deepl.com/v2/translate'

source="${1:-DE}"
target="${2:-EN-US}"

curl -sS "$ENDPOINT" \
	-H "Authorization: DeepL-Auth-Key $DEEPL_API_TOKEN" \
	--data-urlencode "text=$(cat)" \
	-d "source_lang=$source" \
	-d "target_lang=$target" \
| { command -v jq >/dev/null 2>&1 && jq -r '.translations[].text' || cat; }