repeated errors don't cause repeated windows

src/component.py

@@ -17,7 +17,7 @@ class ComponentMetaclass(type(QtCore.QObject)):
         def initializationWrapper(self, *args, **kwargs):
             try:
                 return func(self, *args, **kwargs)
-            except:
+            except Exception:
                 try:
                     raise ComponentInitError(self, 'initialization process')
                 except ComponentError:
@@ -28,7 +28,7 @@ class ComponentMetaclass(type(QtCore.QObject)):
         def renderWrapper(self, *args, **kwargs):
             try:
                 return func(self, *args, **kwargs)
-            except:
+            except Exception:
                 from toolkit.frame import BlankFrame
                 try:
                     raise ComponentError(self, 'renderer')
@@ -398,8 +398,19 @@ class Component(QtCore.QObject, metaclass=ComponentMetaclass):
 
 class ComponentException(RuntimeError):
     '''A base class for component errors'''
+
+    _prevErrors = []
+
     def __init__(self, caller, name, immediate):
+        print('ComponentError by %s: %s' % (caller.name, name))
         super().__init__()
+        if len(ComponentException._prevErrors) > 1:
+            ComponentException._prevErrors.pop()
+        ComponentException._prevErrors.insert(0, name)
+        if name in ComponentException._prevErrors[1:]:
+            # Don't create multiple windows for repeated messages
+            return
+
         from toolkit import formatTraceback
         import sys
         if sys.exc_info()[0] is not None:

src/components/sound.py

@@ -1,7 +1,6 @@
 from PyQt5 import QtGui, QtCore, QtWidgets
 import os
 
-from core import Core
 from component import Component
 from toolkit.frame import BlankFrame
 

src/components/video.py

@@ -6,8 +6,7 @@ import subprocess
 import threading
 from queue import PriorityQueue
 
-from core import Core
+from component import Component
-from component import Component, ComponentError
 from toolkit.frame import BlankFrame
 from toolkit.ffmpeg import testAudioStream
 from toolkit import openPipe, checkOutput
@@ -155,6 +154,7 @@ class Component(Component):
             return frame
 
     def properties(self):
+        # TODO: Disallow selecting the same video you're exporting to
         props = []
         if not self.videoPath or self.badVideo \
                 or not os.path.exists(self.videoPath):

src/core.py

@@ -215,7 +215,7 @@ class Core:
                     if hasattr(loader, 'updateComponentTitle'):
                         loader.updateComponentTitle(i, modified)
 
-            except:
+            except Exception:
                 errcode = 1
                 data = sys.exc_info()
 
@@ -237,9 +237,10 @@ class Core:
         self.openingProject = False
 
     def parseAvFile(self, filepath):
-        '''Parses an avp (project) or avl (preset package) file.
+        '''
-        Returns dictionary with section names as the keys, each one
+            Parses an avp (project) or avl (preset package) file.
-        contains a list of tuples: (compName, version, compPresetDict)
+            Returns dictionary with section names as the keys, each one
+            contains a list of tuples: (compName, version, compPresetDict)
         '''
         validSections = (
                     'Components',
@@ -287,7 +288,7 @@ class Core:
                         data[section].append((key, value.strip()))
 
             return 0, data
-        except:
+        except Exception:
             return 1, sys.exc_info()
 
     def importPreset(self, filepath):
@@ -332,7 +333,7 @@ class Core:
                 exportPath
             )
             return True
-        except:
+        except Exception:
             return False
 
     def createPresetFile(
@@ -397,7 +398,7 @@ class Core:
                         )
                     )
             return True
-        except:
+        except Exception:
             return False
 
     def newVideoWorker(self, loader, audioFile, outputPath):

src/mainwindow.py

@@ -314,7 +314,7 @@ class MainWindow(QtWidgets.QMainWindow):
                         ['ffmpeg', '-version'], stderr=f
                     )
                 goodVersion = str(ffmpegVers).split()[2].startswith('3')
-            except:
+            except Exception:
                 goodVersion = False
         else:
             goodVersion = True
@@ -381,7 +381,7 @@ class MainWindow(QtWidgets.QMainWindow):
         )
 
     @QtCore.pyqtSlot()
-    def cleanUp(self):
+    def cleanUp(self, *args):
         self.timer.stop()
         self.previewThread.quit()
         self.previewThread.wait()

src/presetmanager.py

@@ -211,10 +211,9 @@ class PresetManager(QtWidgets.QDialog):
         self.parent.drawPreview()
 
     def openDeletePresetDialog(self):
-        selected = self.window.listWidget_presets.selectedItems()
+        row = self.getPresetRow()
-        if not selected:
+        if row == -1:
             return
-        row = self.window.listWidget_presets.row(selected[0])
         comp, vers, name = self.presetRows[row]
         ch = self.parent.showMessage(
             msg='Really delete %s?' % name,
@@ -242,32 +241,40 @@ class PresetManager(QtWidgets.QDialog):
             'numbers, and spaces.',
             parent=window if window else self.window)
 
+    def getPresetRow(self):
+        row = self.window.listWidget_presets.currentRow()
+        if row > -1:
+            return row
+
+        # check if component selected in MainWindow has preset loaded
+        componentList = self.parent.window.listWidget_componentList
+        compIndex = componentList.currentRow()
+        if compIndex == -1:
+            return compIndex
+
+        preset = self.core.selectedComponents[compIndex].currentPreset
+        if preset is None:
+            return -1
+        else:
+            rowTuple = (
+                self.core.selectedComponents[compIndex].name,
+                self.core.selectedComponents[compIndex].version,
+                preset
+            )
+            for i, tup in enumerate(self.presetRows):
+                if rowTuple == tup:
+                    index = i
+                    break
+            else:
+                    return -1
+        return index
+
     def openRenamePresetDialog(self):
         # TODO: maintain consistency by changing this to call createNewPreset()
         presetList = self.window.listWidget_presets
-        index = presetList.currentRow()
+        index = self.getPresetRow()
         if index == -1:
-            # check if component selected in MainWindow has preset loaded
+            return
-            componentList = self.parent.window.listWidget_componentList
-            compIndex = componentList.currentRow()
-            if compIndex == -1:
-                return
-
-            preset = self.core.selectedComponents[compIndex].currentPreset
-            if preset is None:
-                return
-            else:
-                rowTuple = (
-                    self.core.selectedComponents[compIndex].name,
-                    self.core.selectedComponents[compIndex].version,
-                    preset
-                )
-                for i, tup in enumerate(self.presetRows):
-                    if rowTuple == tup:
-                        index = i
-                        break
-                else:
-                    return
 
         while True:
             newName, OK = QtWidgets.QInputDialog.getText(
@@ -326,14 +333,14 @@ class PresetManager(QtWidgets.QDialog):
             self.settings.setValue("presetDir", os.path.dirname(filename))
 
     def openExportDialog(self):
-        if not self.window.listWidget_presets.selectedItems():
+        index = self.getPresetRow()
+        if index == -1:
             return
         filename, _ = QtWidgets.QFileDialog.getSaveFileName(
             self.window, "Export Preset",
             self.settings.value("presetDir"),
             "Preset Files (*.avl)")
         if filename:
-            index = self.window.listWidget_presets.currentRow()
             comp, vers, name = self.presetRows[index]
             if not self.core.exportPreset(filename, comp, vers, name):
                 self.parent.showMessage(

src/video_thread.py

@@ -225,7 +225,7 @@ class Worker(QtCore.QObject):
         self.renderThreads = []
         try:
             numCpus = len(os.sched_getaffinity(0))
-        except:
+        except Exception:
             numCpus = os.cpu_count()
 
         for i in range(2 if numCpus <= 2 else 3):
@@ -268,7 +268,7 @@ class Worker(QtCore.QObject):
                 try:
                     self.out_pipe.stdin.write(frameBuffer[audioI].tobytes())
                     self.previewQueue.put([audioI, frameBuffer.pop(audioI)])
-                except:
+                except Exception:
                     break
 
                 # increase progress bar value
@@ -293,7 +293,7 @@ class Worker(QtCore.QObject):
             print("Export Canceled")
             try:
                 os.remove(self.outputFile)
-            except:
+            except Exception:
                 pass
             self.progressBarUpdate.emit(0)
             self.progressBarSetText.emit('Export Canceled')
@@ -333,7 +333,7 @@ class Worker(QtCore.QObject):
 
         try:
             self.out_pipe.send_signal(signal.SIGINT)
-        except:
+        except Exception:
             pass
 
     def reset(self):