try to search for save3ds_fuse in PATH, if not found locally

custominstall/__main__.py

@@ -15,7 +15,7 @@ from os.path import dirname, join, isdir, isfile
 from random import randint
 from hashlib import sha256
 from pprint import pformat
-from shutil import copyfile, copy2, rmtree
+from shutil import copyfile, copy2, rmtree, which
 import sys
 from sys import platform, executable
 from tempfile import TemporaryDirectory
@@ -64,6 +64,9 @@ else:
         script_dir = dirname(__file__)
         save3ds_fuse_path = join(script_dir, 'bin', platform, save3ds_fuse_name)
 
+    if not isfile(save3ds_fuse_path):
+        save3ds_fuse_path = which('save3ds_fuse')
+
 # missing contents are replaced with 0xFFFFFFFF in the cmd file
 CMD_MISSING = b'\xff\xff\xff\xff'
 
@@ -289,7 +292,7 @@ class CustomInstall:
         return isdir(sd_path)
 
     def start(self):
-        if not isfile(save3ds_fuse_path):
+        if not (save3ds_fuse_path and isfile(save3ds_fuse_path)):
             self.log("Couldn't find " + save3ds_fuse_path, 2)
             return None, False, 0
 

custominstall/gui.py

@@ -26,7 +26,7 @@ from pyctr.type.cia import CIAError
 from pyctr.type.tmd import TitleMetadataError
 
 from . import __version__
-from .__main__ import CustomInstall, load_cifinish, InvalidCIFinishError, InstallStatus
+from .__main__ import CustomInstall, load_cifinish, InvalidCIFinishError, InstallStatus, save3ds_fuse_path
 
 if TYPE_CHECKING:
     from os import PathLike
@@ -739,6 +739,10 @@ class CustomInstallGUI(ttk.Frame):
 
 
 def main():
+    if not (save3ds_fuse_path and isfile(save3ds_fuse_path)):
+        mb.showerror('Error', "Couldn't find save3ds_fuse. Please place it PATH.")
+        return
+
     window = tk.Tk()
     window.title(f'custom-install {__version__}')
     frame = CustomInstallGUI(window)