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46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
"""Preprocessor for merging consecutive stream outputs for easier handling."""
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import re
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from nbconvert.preprocessors import Preprocessor
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CR_PAT = re.compile(r".*\r(?=[^\n])")
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class CoalesceStreamsPreprocessor(Preprocessor):
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"""
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Merge consecutive sequences of stream output into single stream
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to prevent extra newlines inserted at flush calls
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"""
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def preprocess_cell(self, cell, resources, cell_index):
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"""
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Apply a transformation on each cell. See base.py for details.
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"""
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outputs = cell.get("outputs", [])
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if not outputs:
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return cell, resources
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last = outputs[0]
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new_outputs = [last]
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for output in outputs[1:]:
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if (
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output.output_type == "stream"
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and last.output_type == "stream"
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and last.name == output.name
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):
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last.text += output.text
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else:
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new_outputs.append(output)
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last = output
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# process \r characters
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for output in new_outputs:
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if output.output_type == "stream" and "\r" in output.text:
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output.text = CR_PAT.sub("", output.text)
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cell.outputs = new_outputs
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return cell, resources
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