Use standard lilypond for standard key sigs

engine/api.py

@@ -1652,8 +1652,10 @@ def insertLegatoSlur():
 
 
 #Key Signatures
-def insertKeySignature(root, scheme):
+def insertKeySignature(root:int, scheme:list, lilypondOverride:str=None):
     keysig = items.KeySignature(pitchmath.plain(root), scheme)
+    if lilypondOverride:
+        keysig.lilypondParameters["override"] = lilypondOverride
     insertItem(keysig)
 
 def commonKeySignaturesAsList():
@@ -1673,7 +1675,7 @@ def commonKeySignaturesAsList():
         "Hollywood",
         ]
 
-def insertCommonKeySignature(root, scheme):
+def insertCommonKeySignature(root:int, scheme:str):
     """example:
     insertCommonKeySignature(P_C, "Major")
     """
@@ -1688,13 +1690,28 @@ def insertCommonKeySignature(root, scheme):
         "Hollywood": [0,0,0,0,0,-10,-10], #The "Hollywood"-Scale. Stargate, Lord of the Rings etc.
         #TODO: MOAR!
         }
-    insertKeySignature(root, schemes[scheme])
 
-def insertCursorCommonKeySignature(scheme):
+    #Lilypond knows some standard key signature modes, which produce cleaner output than our default verbose note-for-note one.
+    lySupported = ("major", "minor", "dorian", "phrygian", "lydian", "mixolydian", "locrian")
+
+    if scheme.lower() in lySupported:
+        lyRootNote = pitchmath.pitch2ly[root].strip("'").strip(",").lower()
+        lyovrd = f"\\key {lyRootNote} \\{scheme.lower()}"
+    else:
+        lyovrd = None
+
+    insertKeySignature(root, schemes[scheme], lilypondOverride=lyovrd)
+
+def insertCursorCommonKeySignature(scheme:str):
     """Root note is generated from the cursor pitch position and takes the previous keysig
-    into account."""
-    root = pitchmath.plain(session.data.cursor.pitchindex)
+    into account.
+
+    Scheme is a string as seen in commonKeySignaturesAsList()
+    """
+    if not scheme in commonKeySignaturesAsList():
+        raise ValueError("Unknown key signature scheme string: " + scheme)
 
+    root = pitchmath.plain(session.data.cursor.pitchindex)
     keysig = session.data.currentTrack().state.keySignature()
     pitchToInsert = pitchmath.toScale(session.data.cursor.pitchindex, keysig)