Added ability to combine multiple CBZ into one files (#960)

* Added basic CBZ combine func

Need to add support for epub and maybe mobi.

* Removed irrelevant code for CBZ file fusion

* Fixed false description

* Removed irrelevant code

* Removed redundant code

Replaced page tracker and os.rename with os.renames. Removed unneeded reference to gui. Changed mkdir to mkdtemp.

* Made folder and cbz work together

You can select multiple folders of images, multiple cbz files, and folders with subfolders. Fusion will combine them all together at the same time. Mainly added this to idiot proof it.

* Updated gui

Removed redundant tooltip

* simplify code

* fix merging chapter folders with .

* uncheck fusion message

---------

Co-authored-by: Alex Xu <alexkurosakimh3@gmail.com>

kindlecomicconverter/comic2ebook.py

@@ -28,6 +28,7 @@ from copy import copy
 from glob import glob, escape
 from re import sub
 from stat import S_IWRITE, S_IREAD, S_IEXEC
+from typing import List
 from zipfile import ZipFile, ZIP_STORED, ZIP_DEFLATED
 from tempfile import mkdtemp, gettempdir, TemporaryFile
 from shutil import move, copytree, rmtree, copyfile
@@ -36,6 +37,7 @@ from uuid import uuid4
 from natsort import os_sort_keygen
 from slugify import slugify as slugify_ext
 from PIL import Image, ImageFile
+from pathlib import Path
 from subprocess import STDOUT, PIPE, CalledProcessError
 from psutil import virtual_memory, disk_usage
 from html import escape as hescape
@@ -1242,6 +1244,40 @@ def checkPre(source):
         raise UserWarning("Target directory is not writable.")
 
 
+def makeFusion(sources: List[str]):
+    if len(sources) < 2:
+        raise UserWarning('Fusion requires at least 2 sources. Did you forget to uncheck fusion?')
+    start = perf_counter()
+    first_path = Path(sources[0])
+    if first_path.is_file():
+        fusion_path = first_path.parent.joinpath(first_path.stem + ' [fused]')
+    else:
+        fusion_path = first_path.parent.joinpath(first_path.name + ' [fused]')
+    print("Running Fusion")
+
+    for source in sources:
+        print(f"Processing {source}...")
+        checkPre(source)
+        print("Checking images...")
+        path = getWorkFolder(source)
+        pathfinder = os.path.join(path, "OEBPS", "Images")
+        sanitizeTree(pathfinder)
+        # TODO: remove flattenTree when subchapters are supported
+        flattenTree(pathfinder)
+        source_path = Path(source)
+        if source_path.is_file():
+            os.renames(pathfinder, fusion_path.joinpath(source_path.stem))
+        else:
+            os.renames(pathfinder, fusion_path.joinpath(source_path.name))
+        
+
+    end = perf_counter()
+    print(f"makefusion: {end - start} seconds")
+    print("Combined File: "+ str(fusion_path))
+    
+    return str(fusion_path)
+
+
 def makeBook(source, qtgui=None):
     start = perf_counter()
     global GUI