238 lines
8.7 KiB
Python
238 lines
8.7 KiB
Python
import os
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import argparse
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import fitz
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import Levenshtein
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from pubs.plugins import PapersPlugin
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from pubs.events import DocAddEvent, NoteEvent
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from pubs import repo
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from pubs.utils import resolve_citekey_list
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from pubs.content import check_file, read_text_file, write_file
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class ExtractPlugin(PapersPlugin):
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"""Extract annotations from any pdf document.
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The extract plugin allows manual or automatic extraction of all annotations
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contained in the pdf documents belonging to entries of the pubs library.
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It can write those changes to stdout or directly create and update notes
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for the pubs entries.
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It adds a `pubs extract` subcommand through which it is invoked, but can
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optionally run whenever a new document is imported for a pubs entry.
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"""
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name = "extract"
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description = "Extract annotations from pubs documents"
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def __init__(self, conf, ui):
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self.ui = ui
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self.note_extension = conf["main"]["note_extension"]
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self.repository = repo.Repository(conf)
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self.pubsdir = os.path.expanduser(conf["main"]["pubsdir"])
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self.broker = self.repository.databroker
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# TODO implement custom annotation formatting, akin to main config citekey format
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# e.g. `> [{page}] {annotation}`
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# or `:: {annotation} :: {page} ::`
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# and so on
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self.on_import = conf["plugins"].get("extract", {}).get("on_import", False)
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self.minimum_similarity = float(conf["plugins"].get("extract", {}).get("minimum_similarity", 0.75))
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def update_parser(self, subparsers, conf):
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"""Allow the usage of the pubs extract subcommand"""
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# TODO option for ignoring missing documents or erroring.
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extract_parser = subparsers.add_parser(self.name, help=self.description)
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extract_parser.add_argument(
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"citekeys",
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nargs=argparse.REMAINDER,
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help="citekey(s) of the documents to extract from",
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)
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extract_parser.add_argument(
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"-w",
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"--write",
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help="Write to individual notes instead of standard out. Appends to existing notes.",
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action="store_true",
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default=None,
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)
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extract_parser.add_argument(
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"-e",
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"--edit",
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help="Open each note in editor for manual editing after extracting annotations to it.",
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action="store_true",
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default=False,
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)
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extract_parser.set_defaults(func=self.command)
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def command(self, conf, args):
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"""Run the annotation extraction command."""
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citekeys = resolve_citekey_list(
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self.repository, conf, args.citekeys, ui=self.ui, exit_on_fail=True
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)
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if not citekeys:
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return
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all_annotations = self.extract(citekeys)
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if args.write:
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self._to_notes(all_annotations, self.note_extension, args.edit)
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else:
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self._to_stdout(all_annotations)
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self.repository.close()
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def extract(self, citekeys):
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"""Extracts annotations from citekeys.
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Returns all annotations belonging to the papers that
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are described by the citekeys passed in.
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"""
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papers = self._gather_papers(citekeys)
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papers_annotated = []
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for paper in papers:
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file = self._get_file(paper)
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try:
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papers_annotated.append((paper, self._get_annotations(file)))
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except fitz.FileDataError as e:
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self.ui.error(f"Document {file} is broken: {e}")
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return papers_annotated
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def _gather_papers(self, citekeys):
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"""Get all papers for citekeys.
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Returns all Paper objects described by the citekeys
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passed in.
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"""
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papers = []
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for key in citekeys:
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papers.append(self.repository.pull_paper(key))
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return papers
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def _get_file(self, paper):
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"""Get path of document belonging to paper.
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Returns the real path to the document which belongs
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to the paper passed in. Emits a warning if no
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document belongs to paper.
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"""
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path = self.broker.real_docpath(paper.docpath)
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if not path:
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self.ui.warning(f"{paper.citekey} has no valid document.")
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return path
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def _get_annotations(self, filename):
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"""Extract annotations from a file.
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Returns all readable annotations contained in the file
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passed in. Only returns Highlight or Text annotations
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currently.
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"""
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annotations = []
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with fitz.Document(filename) as doc:
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for page in doc:
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for annot in page.annots():
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content = self._retrieve_annotation_content(page, annot)
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if content:
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annotations.append(f"[{(page.number or 0) + 1}] {content}")
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return annotations
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def _retrieve_annotation_content(self, page, annotation, highlight_prefix = "> ", note_prefix = "Note: "):
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"""Gets the text content of an annotation.
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Returns the actual content of an annotation. Sometimes
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that is only the written words, sometimes that is only
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annotation notes, sometimes it is both. Runs a similarity
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comparison between strings to find out whether they
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should both be included or are doubling up.
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"""
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content = annotation.info["content"].replace("\n", " ")
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written = page.get_textbox(annotation.rect).replace("\n", " ")
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# highlight with selection in note
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if Levenshtein.ratio(content,written) > self.minimum_similarity:
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return f"{highlight_prefix}{content}"
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# an independent note, not a highlight
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elif content and not written:
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return f"{note_prefix}{content}"
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# both a highlight and a note
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elif content:
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return f"{highlight_prefix}{written}\n{note_prefix}{content}"
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# highlight with selection not in note
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return f"{highlight_prefix}{written}"
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def _to_stdout(self, annotated_papers):
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"""Write annotations to stdout.
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Simply outputs the gathered annotations over stdout
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ready to be passed on through pipelines etc.
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"""
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output = ""
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for contents in annotated_papers:
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paper = contents[0]
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annotations = contents[1]
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if annotations:
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output += f"{paper.citekey}\n"
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for annot in annotations:
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output += f'{annot}\n\n'
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output += "\n"
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print(output)
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def _to_notes(self, annotated_papers, note_extension="txt", edit=False):
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"""Write annotations into pubs notes.
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Permanently writes the given annotations into notes
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in the pubs notes directory. Creates new notes for
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citekeys missing a note or appends to existing.
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"""
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for contents in annotated_papers:
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paper = contents[0]
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annotations = contents[1]
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if annotations:
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notepath = self.broker.real_notepath(paper.citekey, note_extension)
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if check_file(notepath, fail=False):
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self._append_to_note(notepath, annotations)
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else:
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self._write_new_note(notepath, annotations)
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self.ui.info(f"Wrote annotations to {paper.citekey} note {notepath}.")
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if edit is True:
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self.ui.edit_file(notepath, temporary=False)
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NoteEvent(paper.citekey).send()
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def _write_new_note(self, notepath, annotations):
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"""Create a new note containing the annotations.
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Will create a new note in the notes folder of pubs
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and fill it with the annotations extracted from pdf.
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"""
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output = "# Annotations\n\n"
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for annotation in annotations:
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output += f"> {annotation}\n\n"
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write_file(notepath, output, "w")
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def _append_to_note(self, notepath, annotations):
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"""Append new annotations to the end of a note.
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Looks through note to determine any new annotations which should be
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added and adds them to the end of the note file.
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"""
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existing = read_text_file(notepath)
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# removed annotations already found in the note
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existing_dropped = [x for x in annotations if x not in existing]
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if not existing_dropped:
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return
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output = ""
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for annotation in existing_dropped:
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output += f"> {annotation}\n\n"
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write_file(notepath, output, "a")
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@DocAddEvent.listen()
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def modify_event(event):
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if ExtractPlugin.is_loaded():
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plg = ExtractPlugin.get_instance()
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if plg.on_import:
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all_annotations = plg.extract([event.citekey])
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if all_annotations[0][1]:
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plg._to_notes(all_annotations, plg.note_extension)
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