Major refactor

I have spent some time (like two hours) fixing up the app, getting it up
to a somewhat better level. Code is still bad, but that's that. If
anybody is interested to make the code neater, feel free to open a PR!

lib/midi_management.py

@@ -0,0 +1,99 @@
+from mido import MidiFile
+import pyperclip as pc
+
+
+class MidiManagement:
+    def __init__(self):
+        pass
+
+    def addToClipboard(self, text):
+        pc.copy(text)
+
+    def analyse_track(self, path, trackname):
+        mid = MidiFile(path, clip=True)
+        tracks = []
+        for i, track in enumerate(mid.tracks):
+            tracks.append('{} (Track {})'.format(track.name, i))
+        if len(tracks) > 1:
+            tracks.pop(0)
+        else:
+            pass
+        extracted_track = tracks.pop(0)
+        tracknumber = 0
+        while extracted_track != trackname:
+            extracted_track = tracks.pop(0)
+            tracknumber += 1
+        output_list = []
+
+        # Track messages
+        for msg in mid.tracks[tracknumber]:
+            midi_msg = str(msg)
+            if midi_msg[0:8] == "note_on ":
+                try:
+                    msg_loc = midi_msg.index('note=')
+                    note = midi_msg[msg_loc + 5:msg_loc + 7]
+                    note_height = int(note)
+                    note_decod_oct = note_height // 12
+                    note_decode_tone = note_height % 12
+                    note_ext = ""
+                    if note_decode_tone == 1:
+                        note_ext = "C"
+                    elif note_decode_tone == 2:
+                        note_ext = "C#"
+                    elif note_decode_tone == 3:
+                        note_ext = "D"
+                    elif note_decode_tone == 4:
+                        note_ext = "D#"
+                    elif note_decode_tone == 5:
+                        note_ext = "E"
+                    elif note_decode_tone == 6:
+                        note_ext = "F"
+                    elif note_decode_tone == 7:
+                        note_ext = "F#"
+                    elif note_decode_tone == 8:
+                        note_ext = "G"
+                    elif note_decode_tone == 9:
+                        note_ext = "G#"
+                    elif note_decode_tone == 10:
+                        note_ext = "A"
+                    elif note_decode_tone == 11:
+                        note_ext = "A#"
+                    elif note_decode_tone == 12:
+                        note_ext = "H"
+
+                    ext_shortened = midi_msg[40:]
+                    pos = 0
+                    for buchstabe in ext_shortened:
+                        if buchstabe == "=":
+                            pos += 1
+                            break
+                        else:
+                            pos += 1
+
+                    timing_exp = ext_shortened[pos:]
+                    output = note_ext
+                    output += str(note_decod_oct)
+                    output += f":{timing_exp}"
+                    output_list.append(str(output))
+
+                except:
+                    pass
+            elif midi_msg[0:8] == "note_off":
+                ext_shortened = midi_msg[40:]
+                pos = 0
+                for buchstabe in ext_shortened:
+                    if buchstabe == "=":
+                        pos += 1
+                        break
+                    else:
+                        pos += 1
+                output = "R"
+                output += f":{pos}"
+
+                timing_exp = ext_shortened[pos:]
+                output_list.append(output)
+            else:
+                pass
+
+        self.addToClipboard(str(output_list))
+