do not ignore leading space

protocol_translation_live/__main__.py

@@ -11,11 +11,13 @@ import utils
 from pad import Etherpad, HedgedocNote, Pad
 from translation import DeepL, LibreTranslate, Translation
 
-# TODO: implement initial test of config file (if values are ok and stuff), provide fallback values, error msgs
 # TODO: scheint nur bei fem-instanz zu funktionieren. bei libretranslate.de kackt das ab
-# TODO: document config properly
-# TODO: proper typing
 # TODO: update setup.py
+# TODO: tab in quelldatei führt zu 8space in destination
+# TODO: übersetzung parallelisieren mit echten threads
+# TODO: proper typing
+# TODO: error msgs werden nicht in systemd krams geschrieben
+# TODO: ordentliche setup anleitung
 
 
 def main():
@@ -124,20 +126,39 @@ def main():
     def translate_with_leading_whitespace(lines: List[str]) -> List[str]:
         """ translate list of strings with trailing whitespace lines:
             * strip leading lines consisting of whitespace,
-            * add them when writing to dst_pad
+            * strip leading space string from each line
+            * add both when writing to dst_pad
             This has to be done, because libretranslate ignores leading whitespace,
             leading to incorrect order of the translated lines.
         """
-        leading_space_lines = list(
+        # filter leading space lines
+        space_lines = list(
             takewhile(lambda line: line.isspace() or not line, lines))
 
-        text_to_translate = '\n'.join(
-            lines[len(leading_space_lines):])
+        # filter leading space strings of each line
+        lstrings: List[str] = []
+        lines_to_translate: List[str] = []
+        for line in lines[len(space_lines):]:
+            # compute leading strings
+            lchars = list(
+                takewhile(lambda character: character.isspace(), line))
+            lstring = ''.join(lchars)
+            lstrings.append(lstring)
+            # create lines where leading space strings are stripped
+            lines_to_translate.append(line[len(lchars):])
+
+        # translate it
+        text_to_translate = '\n'.join(lines_to_translate)
 
         translated_lines = t.translate(text_to_translate, src_lang,
                                        dst_lang).splitlines()
 
-        return leading_space_lines + translated_lines
+        # append leading strings per line
+        translated_lines_lspace: List[str] = []
+        for space, line in zip(lstrings, translated_lines):
+            translated_lines_lspace.append(space + line)
+
+        return space_lines + translated_lines_lspace
 
     dst_pad.write("initializing...")