Greek transliteration enhancements (#3)

* Enhancements:
- greek_transliteration can handle some punctuation marks

* Translitation function fixes, tests and readme

README.md

@@ -77,4 +77,29 @@ False
 # Both look the same but are different unnicode characters
 >>> ANNA == ΑΝΝΑ
 False
+```
+
+There's also the abillity to convert a word from latin to it's intended accentuated once in Greek:
+
+```
+>>> greek_transliteration("P;ita soybl;aki")
+Πίτα σουβλάκι
+
+>>> greek_transliteration("kaWiki")
+καΐκι
+
+>>> greek_transliteration("pro:yp;ouesh")
+προϋπόθεση
+
+>>> greek_transliteration("GA:IDAROS")
+ΓΑΪΔΑΡΟΣ
+```
+
+Note: The function takes as given that the user intended to write the work in Greek using the correct key sequence but just didn't switch their keyboard to Greek. It doesn't convert from Greeklish!
+
+```
+# Wrong key sequence by user.
+# They're supposed to press SHIFT + W and not just w for the ΅ character to appear.
+>>> greek_transliteration("kawiki")
+καςικι
 ```

src/greeklt/greek_transliteration.py

@@ -1,10 +1,30 @@
 def greek_transliteration(string: str):
-    eng = "abcdefghijklmnoprstuvwxyzABCDEFGHIJKLMNOPRSTUVWXYZ"
-    el = "αβψδεφγηιξκλμνοπρστθωςχυζΑΒΨΔΕΦΓΗΙΞΚΛΜΝΟΠΡΣΤΘΩςΧΥΖ"
+    eng = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    el = "αβψδεφγηιξκλμνοπ;ρστθωςχυζΑΒΨΔΕΦΓΗΙΞΚΛΜΝΟΠ:ΡΣΤΘΩςΧΥΖ"
+    diaresis = {"i": "ϊ", "I": "Ϊ", "y": "ϋ", "Y": "Ϋ"}
+    accent = {"a": "ά", "e": "έ", "h": "ή", "i": "ί", "o": "ό", "y": "ύ", "v": "ώ"}
+    diaresis_accent = {"i": "ΐ", "y": "ΰ"}
+
     new_string = ""
-    for i in string:
-        if i in eng:
-            new_string += el[eng.index(i)]
+    for i, letter in enumerate(string):
+        if letter in eng:
+            if i != len(string) - 1 and letter == "W":
+                if string[i + 1] in diaresis_accent.keys():
+                    new_string += diaresis_accent[string[i + 1]]
+                else:
+                    new_string += el[eng.index(letter)]
+            elif (string[i - 1] == "W" and letter in diaresis.keys()) or (
+                string[i - 1] in (";", ":")
+                and (letter in accent.keys() or letter in diaresis.keys())
+            ):
+                continue
+            else:
+                new_string += el[eng.index(letter)]
+        elif letter in (";", ":"):
+            if letter == ";":
+                new_string += accent[string[i + 1]]
+            else:
+                new_string += diaresis[string[i + 1]]
         else:
-            new_string += i
+            new_string += letter
     return new_string

tests/test_tests.py

@@ -19,10 +19,10 @@ def test_remove_accentuation():
 def test_transilteration():
 
     assert greek_transliteration("fvtia") == "φωτια"
-    assert (
-        greek_transliteration("Gamow htane den htane na ginei")
-        == "Γαμος ητανε δεν ητανε να γινει"
-    )
+    assert greek_transliteration("kaWiki") == "καΐκι"
+    assert greek_transliteration("p;ita soybl;aki") == "πίτα σουβλάκι"
+    assert greek_transliteration("pro:yp;ouesh") == "προϋπόθεση"
+    assert greek_transliteration("GA:IDAROS") == "ΓΑΪΔΑΡΟΣ"
 
 
 def test_convert_final_s():