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pdf2txt: clean up construction of LAParams from arguments (#682)
* Fix pdf2txt --boxes-flow=disabled Fixes: ``` $ pdf2txt.py --boxes-flow=disabled test.pdf Traceback (most recent call last): File "tools/pdf2txt.py", line 204, in <module> sys.exit(main()) File "tools/pdf2txt.py", line 198, in main outfp = extract_text(**vars(A)) File "tools/pdf2txt.py", line 66, in extract_text pdfminer.high_level.extract_text_to_fp(fp, **locals()) File "pdfminer/high_level.py", line 85, in extract_text_to_fp interpreter.process_page(page) File "pdfminer/pdfinterp.py", line 896, in process_page self.device.end_page(page) File "pdfminer/converter.py", line 51, in end_page self.cur_item.analyze(self.laparams) File "pdfminer/layout.py", line 822, in analyze group.analyze(laparams) File "pdfminer/layout.py", line 575, in analyze LTTextGroup.analyze(self, laparams) File "pdfminer/layout.py", line 362, in analyze obj.analyze(laparams) File "pdfminer/layout.py", line 575, in analyze LTTextGroup.analyze(self, laparams) File "pdfminer/layout.py", line 362, in analyze obj.analyze(laparams) File "pdfminer/layout.py", line 575, in analyze LTTextGroup.analyze(self, laparams) File "pdfminer/layout.py", line 362, in analyze obj.analyze(laparams) File "pdfminer/layout.py", line 577, in analyze self._objs.sort( File "pdfminer/layout.py", line 578, in <lambda> key=lambda obj: (1 - laparams.boxes_flow) * obj.x0 TypeError: unsupported operand type(s) for -: 'int' and 'str' ``` Related: Issue #477, PR #479 * update CHANGELOG * merge CHANGELOG * pdf2txt: clean up handling of layout parameter arguments * avoid specifying default values twice * construct LAParams earlier, rather than passing its components around * fix crash with --boxes_flow=disabled * update CHANGELOG * construct new LAParams, so _validate runs * Improve readability of setting LAParams by explicitly copying them from parsed_args into init of LAParams. And move all parsed_args post processing to the parse_args() method. * Add cli argument for line_overlap * Also use default values from LAParams for --detect-vertical and --all-texts Co-authored-by: Pieter Marsman <pietermarsman@gmail.com>
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