matplotlib
diff --git a/‎tools/test_triage.py
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+"""
+This is a developer utility to help analyze and triage image
+comparison failures.
+
+It allows the failures to be quickly compared against the expected
+results, and the new results to be either accepted (by copying the new
+results to the source tree) or rejected (by copying the original
+expected result to the source tree).
+
+To start:
+
+    If you ran the tests from the top-level of a source checkout, simply run:
+
+        python tools/test_triage.py
+
+    Otherwise, you can manually select the location of `result_images`
+    on the commandline.
+
+Keys:
+
+    left/right: Move between test, expected and diff images
+    up/down:    Move between tests
+    A:          Accept test.  Copy the test result to the source tree.
+    R:          Reject test.  Copy the expected result to the source tree.
+"""
+
+import os
+import shutil
+import sys
+
+from PyQt4 import QtCore, QtGui
+
+
+# matplotlib stores the baseline images under two separate subtrees,
+# but these are all flattened in the result_images directory.  In
+# order to find the source, we need to search for a match in one of
+# these two places.
+
+BASELINE_IMAGES = [
+    os.path.join('lib', 'matplotlib', 'tests', 'baseline_images'),
+    os.path.join('lib', 'mpl_toolkits', 'tests', 'baseline_images')
+    ]
+
+
+# Non-png image extensions
+
+exts = ['pdf', 'svg']
+
+
+class Thumbnail(QtGui.QFrame):
+    """
+    Represents one of the three thumbnails at the top of the window.
+    """
+    def __init__(self, parent, index, name):
+        super(Thumbnail, self).__init__()
+
+        self.parent = parent
+        self.index = index
+
+        layout = QtGui.QVBoxLayout()
+
+        label = QtGui.QLabel(name)
+        label.setAlignment(QtCore.Qt.AlignHCenter |
+                           QtCore.Qt.AlignVCenter)
+        layout.addWidget(label, 0)
+
+        self.image = QtGui.QLabel()
+        self.image.setAlignment(QtCore.Qt.AlignHCenter |
+                                QtCore.Qt.AlignVCenter)
+        self.image.setMinimumSize(800/3, 600/3)
+        layout.addWidget(self.image)
+        self.setLayout(layout)
+
+    def mousePressEvent(self, ev):
+        self.parent.set_large_image(self.index)
+
+
+class ListWidget(QtGui.QListWidget):
+    """
+    The list of files on the left-hand side
+    """
+    def __init__(self, parent):
+        super(ListWidget, self).__init__()
+        self.parent = parent
+        self.currentRowChanged.connect(self.change_row)
+
+    def change_row(self, i):
+        self.parent.set_entry(i)
+
+
+class EventFilter(QtCore.QObject):
+    # A hack keypresses can be handled globally and aren't swallowed
+    # by the individual widgets
+
+    def __init__(self, window):
+        super(EventFilter, self).__init__()
+        self.window = window
+
+    def eventFilter(self, receiver, event):
+        if event.type() == QtCore.QEvent.KeyPress:
+            self.window.keyPressEvent(event)
+            return True
+        else:
+            return False
+            return super(EventFilter, self).eventFilter(receiver, event)
+
+
+class Dialog(QtGui.QDialog):
+    """
+    The main dialog window.
+    """
+    def __init__(self, entries):
+        super(Dialog, self).__init__()
+
+        self.entries = entries
+        self.current_entry = -1
+        self.current_thumbnail = -1
+
+        event_filter = EventFilter(self)
+        self.installEventFilter(event_filter)
+
+        self.filelist = ListWidget(self)
+        self.filelist.setMinimumWidth(400)
+        for entry in entries:
+            self.filelist.addItem(entry.display)
+
+        images_box = QtGui.QWidget()
+        images_layout = QtGui.QVBoxLayout()
+        thumbnails_box = QtGui.QWidget()
+        thumbnails_layout = QtGui.QHBoxLayout()
+        self.thumbnails = []
+        for i, name in enumerate(('test', 'expected', 'diff')):
+            thumbnail = Thumbnail(self, i, name)
+            thumbnails_layout.addWidget(thumbnail)
+            self.thumbnails.append(thumbnail)
+        thumbnails_box.setLayout(thumbnails_layout)
+        self.image_display = QtGui.QLabel()
+        self.image_display.setAlignment(QtCore.Qt.AlignHCenter |
+                                        QtCore.Qt.AlignVCenter)
+        self.image_display.setMinimumSize(800, 600)
+        images_layout.addWidget(thumbnails_box, 3)
+        images_layout.addWidget(self.image_display, 6)
+        images_box.setLayout(images_layout)
+
+        buttons_box = QtGui.QWidget()
+        buttons_layout = QtGui.QHBoxLayout()
+        accept_button = QtGui.QPushButton("Accept (A)")
+        accept_button.clicked.connect(self.accept_test)
+        buttons_layout.addWidget(accept_button)
+        reject_button = QtGui.QPushButton("Reject (R)")
+        reject_button.clicked.connect(self.reject_test)
+        buttons_layout.addWidget(reject_button)
+        buttons_box.setLayout(buttons_layout)
+        images_layout.addWidget(buttons_box)
+
+        main_layout = QtGui.QHBoxLayout()
+        main_layout.addWidget(self.filelist, 3)
+        main_layout.addWidget(images_box, 6)
+
+        self.setLayout(main_layout)
+
+        self.setWindowTitle("matplotlib test triager")
+
+        self.set_entry(0)
+
+    def set_entry(self, index):
+        if self.current_entry == index:
+            return
+
+        self.current_entry = index
+        entry = self.entries[index]
+
+        self.pixmaps = []
+        for fname, thumbnail in zip(entry.thumbnails, self.thumbnails):
+            pixmap = QtGui.QPixmap(fname)
+            scaled_pixmap = pixmap.scaled(
+                thumbnail.size(), QtCore.Qt.KeepAspectRatio,
+                QtCore.Qt.SmoothTransformation)
+            thumbnail.image.setPixmap(scaled_pixmap)
+            self.pixmaps.append(scaled_pixmap)
+
+        self.set_large_image(0)
+        self.filelist.setCurrentRow(self.current_entry)
+
+    def set_large_image(self, index):
+        self.thumbnails[self.current_thumbnail].setFrameShape(0)
+        self.current_thumbnail = index
+        pixmap = QtGui.QPixmap(
+            self.entries[self.current_entry].thumbnails[self.current_thumbnail])
+        self.image_display.setPixmap(pixmap)
+        self.thumbnails[self.current_thumbnail].setFrameShape(1)
+
+    def accept_test(self):
+        self.entries[self.current_entry].accept()
+        self.filelist.currentItem().setText(
+            self.entries[self.current_entry].display)
+        # Auto-move to the next entry
+        self.set_entry(min((self.current_entry + 1), len(self.entries) - 1))
+
+    def reject_test(self):
+        self.entries[self.current_entry].reject()
+        self.filelist.currentItem().setText(
+            self.entries[self.current_entry].display)
+        # Auto-move to the next entry
+        self.set_entry(min((self.current_entry + 1), len(self.entries) - 1))
+
+    def keyPressEvent(self, e):
+        if e.key() == QtCore.Qt.Key_Left:
+            self.set_large_image((self.current_thumbnail - 1) % 3)
+        elif e.key() == QtCore.Qt.Key_Right:
+            self.set_large_image((self.current_thumbnail + 1) % 3)
+        elif e.key() == QtCore.Qt.Key_Up:
+            self.set_entry(max((self.current_entry - 1), 0))
+        elif e.key() == QtCore.Qt.Key_Down:
+            self.set_entry(min((self.current_entry + 1), len(self.entries) - 1))
+        elif e.key() == QtCore.Qt.Key_A:
+            self.accept_test()
+        elif e.key() == QtCore.Qt.Key_R:
+            self.reject_test()
+        else:
+            super(Dialog, self).keyPressEvent(e)
+
+
+class Entry(object):
+    """
+    A model for a single image comparison test.
+    """
+    def __init__(self, path, root, source):
+        self.source = source
+        self.root = root
+        self.dir, fname = os.path.split(path)
+        self.reldir = os.path.relpath(self.dir, self.root)
+        self.diff = fname
+
+        basename = fname[:-len('-failed-diff.png')]
+        for ext in exts:
+            if basename.endswith('_' + ext):
+                display_extension = '_' + ext
+                extension = ext
+                basename = basename[:-4]
+                break
+        else:
+            display_extension = ''
+            extension = 'png'
+
+        self.basename = basename
+        self.extension = extension
+        self.generated = basename + '.' + extension
+        self.expected = basename + '-expected.' + extension
+        self.expected_display = basename + '-expected' + display_extension + '.png'
+        self.generated_display = basename + display_extension + '.png'
+        self.name = os.path.join(self.reldir, self.basename)
+        self.destdir = self.get_dest_dir(self.reldir)
+
+        self.thumbnails = [
+            self.generated_display,
+            self.expected_display,
+            self.diff
+            ]
+        self.thumbnails = [os.path.join(self.dir, x) for x in self.thumbnails]
+
+        self.status = 'unknown'
+
+        if self.same(os.path.join(self.dir, self.generated),
+                     os.path.join(self.destdir, self.generated)):
+            self.status = 'accept'
+
+    def same(self, a, b):
+        """
+        Returns True if two files have the same content.
+        """
+        with open(a, 'rb') as fd:
+            a_content = fd.read()
+        with open(b, 'rb') as fd:
+            b_content = fd.read()
+        return a_content == b_content
+
+    def copy_file(self, a, b):
+        """
+        Copy file from a to b.
+        """
+        print("copying: {} to {}".format(a, b))
+        shutil.copyfile(a, b)
+
+    def get_dest_dir(self, reldir):
+        """
+        Find the source tree directory corresponding to the given
+        result_images subdirectory.
+        """
+        for baseline_dir in BASELINE_IMAGES:
+            path = os.path.join(self.source, baseline_dir, reldir)
+            if os.path.isdir(path):
+                return path
+        raise ValueError("Can't find baseline dir for {}".format(reldir))
+
+    @property
+    def display(self):
+        """
+        Get the display string for this entry.  This is the text that
+        appears in the list widget.
+        """
+        status_map = {
+            'unknown': '\u2610',
+            'accept':  '\u2611',
+            'reject':  '\u2612'
+            }
+        box = status_map[self.status]
+        return '{} {} [{}]'.format(
+            box, self.name, self.extension)
+
+    def accept(self):
+        """
+        Accept this test by copying the generated result to the
+        source tree.
+        """
+        a = os.path.join(self.dir, self.generated)
+        b = os.path.join(self.destdir, self.generated)
+        self.copy_file(a, b)
+        self.status = 'accept'
+
+    def reject(self):
+        """
+        Reject this test by copying the expected result to the
+        source tree.
+        """
+        a = os.path.join(self.dir, self.expected)
+        b = os.path.join(self.destdir, self.generated)
+        self.copy_file(a, b)
+        self.status = 'reject'
+
+
+def find_failing_tests(result_images, source):
+    """
+    Find all of the failing tests by looking for files with
+    `-failed-diff` at the end of the basename.
+    """
+    entries = []
+    for root, dirs, files in os.walk(result_images):
+        for fname in files:
+            basename, ext = os.path.splitext(fname)
+            if basename.endswith('-failed-diff'):
+                path = os.path.join(root, fname)
+                entry = Entry(path, result_images, source)
+                entries.append(entry)
+    entries.sort(key=lambda x: x.name)
+    return entries
+
+
+def launch(result_images, source):
+    """
+    Launch the GUI.
+    """
+    entries = find_failing_tests(result_images, source)
+
+    if len(entries) == 0:
+        print("No failed tests")
+        sys.exit(0)
+
+    app = QtGui.QApplication(sys.argv)
+    dialog = Dialog(entries)
+    dialog.show()
+    filter = EventFilter(dialog)
+    app.installEventFilter(filter)
+    sys.exit(app.exec_())
+
+
+if __name__ == '__main__':
+    import argparse
+
+    source_dir = os.path.join(os.path.dirname(__file__), '..')
+
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description="""
+Triage image comparison test failures.
+
+If no arguments are provided, it assumes you ran the tests at the
+top-level of a source checkout as `python tests.py`.
+
+Keys:
+    left/right: Move between test, expected and diff images
+    up/down:    Move between tests
+    A:          Accept test.  Copy the test result to the source tree.
+    R:          Reject test.  Copy the expected result to the source tree.
+""")
+    parser.add_argument("result_images", type=str, nargs='?',
+                        default=os.path.join(source_dir, 'result_images'),
+                        help="The location of the result_images directory")
+    parser.add_argument("source", type=str, nargs='?', default=source_dir,
+                        help="The location of the matplotlib source tree")
+    args = parser.parse_args()
+
+    launch(args.result_images, args.source)