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PICARD-1849: add album_save_post_processors to plug-in API. #1565

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PICARD-1849: add album_save_post_processors to plug-in API. #1565

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b4b1743
add album_save_post_processors to plug-in API.
Jun 21, 2020
7b41e12
run isort
Jun 21, 2020
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17 changes: 17 additions & 0 deletions picard/album.py
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Original file line number Diff line number Diff line change
Expand Up @@ -753,3 +753,20 @@ def register_album_post_removal_processor(function, priority=PluginPriority.NORM

def run_album_post_removal_processors(album_object):
_album_post_removal_processors.run(album_object)

_album_post_save_processors = PluginFunctions(label='album_post_save_processors')


def register_album_post_save_processor(function, priority=PluginPriority.NORMAL):
"""Registers an album-removed processor.
Args:
function: function to call after album save, it will be passed the album object
priority: optional, PluginPriority.NORMAL by default
Returns:
None
"""
_album_post_save_processors.register(function.__module__, function, priority)


def run_album_post_save_processors(album_object):
_album_post_save_processors.run(album_object)
32 changes: 28 additions & 4 deletions picard/tagger.py
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,7 @@
Album,
NatAlbum,
run_album_post_removal_processors,
run_album_post_save_processors,
)
from picard.browser.browser import BrowserIntegration
from picard.browser.filelookup import FileLookup
Expand All @@ -98,7 +99,10 @@
)
from picard.dataobj import DataObject
from picard.disc import Disc
from picard.file import File
from picard.file import (
File,
register_file_post_save_processor,
)
from picard.formats import open_ as open_file
from picard.i18n import setup_gettext
from picard.pluginmanager import PluginManager
Expand Down Expand Up @@ -294,6 +298,10 @@ def __init__(self, picard_args, unparsed_args, localedir, autoupdate):
if self.autoupdate_enabled:
self.updatecheckmanager = UpdateCheckManager(parent=self.window)

# track all file save completions for album save
self._album_saves = []
register_file_post_save_processor(self._file_post_save)

def register_cleanup(self, func):
self.exit_cleanup.append(func)

Expand Down Expand Up @@ -658,9 +666,14 @@ def get_files_from_objects(self, objects, save=False):

def save(self, objects):
"""Save the specified objects."""
files = self.get_files_from_objects(objects, save=True)
for file in files:
file.save()
for o in objects:
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Please use obj instead of o

log.debug('save object %r', o)
files = self.get_files_from_objects([o, ], save=True)
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This defeats uniquification (?) implemented in

picard/picard/tagger.py

Lines 663 to 665 in 7b41e12

def get_files_from_objects(self, objects, save=False):
"""Return list of files from list of albums, clusters, tracks or files."""
return uniqify(chain(*[obj.iterfiles(save) for obj in objects]))

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Yes, this can potentially lead to the same file saved twice: You can have both the album and the files selected for saving, but saving should only happen once.

Also we need to be clear what is expected to happen:

  1. If I select the album and save, should the album_save_post_processor be run? (I assume this is a clear YES)
  2. If I select all files of an album, but not the album itself, should the album_save_post_processor be run?
  3. If I select only some files of an album, but not the album itself, should the album_save_post_processor be run?

I tend to say yes to all of the above. But for case 3 it might be useful if the registered processor gets some information, that only a subset has been saved. Optimal would be to pass a list of actually saved files to the processor, so it could figure out what to do with this based on the use case.

for file in files:
file.save()
if isinstance(o, Album):
# track the album and its files pending save
self._album_saves.append((o, files))

def load_album(self, album_id, discid=None):
album_id = self.mbid_redirects.get(album_id, album_id)
Expand Down Expand Up @@ -773,6 +786,17 @@ def remove(self, objects):
if files:
self.remove_files(files)

# run album_save hooks when the last file is saved
def _file_post_save(self, file):
for album, files in self._album_saves:
if file in files:
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Since file will not be found in empty files:

if not files:
    ...
elif file in files:
   ...

files.remove(file)
if not files:
log.debug("Album %r saved, running post_save_processors", album)
run_album_post_save_processors(album)
self._album_saves.remove((album, files))
return
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I'm not sure to understand why we return immediatly here


def _lookup_disc(self, disc, result=None, error=None):
self.restore_cursor()
if error is not None:
Expand Down