enh: display currently processed file in GUI

CHANGELOG

@@ -1,6 +1,7 @@
 0.6.0
  - feat: generalize GUI to use all recipes
  - enh: prevent GUI from locking when transferring large file
+ - enh: display currently processed file in GUI
  - enh: re-use tree count information for transfer progress bar
  - enh: display the actual directory tree instead of a table
  - enh: compute file hash while copying, avoiding reading data twice

mpl_data_cast/gui/main.py

@@ -5,7 +5,6 @@
 import sys
 import threading
 import traceback
-from typing import Dict
 
 import dclab
 import h5py
@@ -153,9 +152,9 @@ def on_task_transfer(self) -> None:
                                  self.widget_output.path)
 
         tree_counter = self.widget_input.tree_counter
-        with CastingCallback(self, tree_counter) as callback:
+        with CastingCallback(self, tree_counter) as path_callback:
             # run the casting operation in a separate thread
-            caster = CastingThread(rp, callback=callback)
+            caster = CastingThread(rp, path_callback=path_callback)
             caster.start()
 
         while not caster.result:
@@ -198,10 +197,8 @@ def __init__(self,
                  tree_counter: widget_tree.TreeObjectCounter):
         self.gui = gui
         self.counter = 0
-        #: This is a thread running in the background, counting all files.
+        #: This is a thread running in the background, counting recipe files.
         self.tree_counter = tree_counter
-        self.size = 0
-        self.time_start = time.monotonic()
 
     def __enter__(self):
         return self
@@ -210,7 +207,8 @@ def __exit__(self, exc_type, exc_val, exc_tb):
         pass
 
     def __call__(self, path) -> None:
-        self.size += path.stat().st_size
+        # Let the user know how far we are
+        self.gui.label_file.setText(f"Processing {path}...")
 
         if self.tree_counter.has_counted:
             self.gui.progressBar.setRange(0, 100)
@@ -224,14 +222,14 @@ def __call__(self, path) -> None:
 
 
 class CastingThread(threading.Thread):
-    def __init__(self, rp, callback, *args, **kwargs):
+    def __init__(self, rp, path_callback, *args, **kwargs):
         super(CastingThread, self).__init__(*args, **kwargs)
         self.rp = rp
-        self.callback = callback
+        self.path_callback = path_callback
         self.result = {}
 
     def run(self):
-        self.result = self.rp.cast(callback=self.callback)
+        self.result = self.rp.cast(path_callback=self.path_callback)
 
 
 def excepthook(etype, value, trace) -> None:
@@ -265,19 +263,6 @@ def excepthook(etype, value, trace) -> None:
         cb.setText(exception)
 
 
-def error(message: str, info: str = "", details: str = "") -> None:
-    """Shows a little window for error messages."""
-    msg = QtWidgets.QMessageBox()
-    msg.setIcon(QtWidgets.QMessageBox.Icon.Critical)
-    msg.setWindowTitle("Errors occured")
-    msg.setText(message)
-    if info:
-        msg.setInformativeText(info)
-    if details:
-        msg.setDetailedText(details)
-    msg.exec()
-
-
 # Make Ctr+C close the app
 signal.signal(signal.SIGINT, signal.SIG_DFL)
 

mpl_data_cast/gui/main.ui

@@ -114,6 +114,13 @@
       </item>
      </layout>
     </item>
+    <item>
+     <widget class="QLabel" name="label_file">
+      <property name="text">
+       <string/>
+      </property>
+     </widget>
+    </item>
     <item>
      <widget class="QProgressBar" name="progressBar">
       <property name="value">

mpl_data_cast/recipe.py

@@ -75,7 +75,8 @@ def cast(self, path_callback: Callable = None, **kwargs) -> dict:
             targ_path = self.get_target_path(path_list)
             temp_path = self.get_temp_path(path_list)
             try:
-                self.convert_dataset(path_list=path_list, temp_path=temp_path,
+                self.convert_dataset(path_list=path_list,
+                                     temp_path=temp_path,
                                      **kwargs)
             except BaseException:
                 errors.append((path_list[0], traceback.format_exc()))
@@ -223,9 +224,9 @@ def transfer_to_target_path(temp_path: pathlib.Path,
                 hash_input = copyhashfile(temp_path, target_path)
             else:
                 shutil.copy2(temp_path, target_path)
-            # compute md5hash of target path
+            # compute md5 hash of target path
             hash_cp = hashfile(target_path)
-            # compare md5hashes (verification)
+            # compare md5 hashes (verification)
             success = hash_input == hash_cp
             if not success:
                 # Since we copied the wrong file, we are responsible for