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70 lines
2.8 KiB
70 lines
2.8 KiB
"""Generic script exporter class for any kernel language"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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import entrypoints
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from .templateexporter import TemplateExporter
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from traitlets import Dict, default
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from .base import get_exporter
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class ScriptExporter(TemplateExporter):
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# Caches of already looked-up and instantiated exporters for delegation:
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_exporters = Dict()
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_lang_exporters = Dict()
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export_from_notebook = "Script"
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@default('template_file')
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def _template_file_default(self):
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return 'script.j2'
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@default('template_name')
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def _template_name_default(self):
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return 'script'
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def _get_language_exporter(self, lang_name):
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"""Find an exporter for the language name from notebook metadata.
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Uses the nbconvert.exporters.script group of entry points.
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Returns None if no exporter is found.
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"""
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if lang_name not in self._lang_exporters:
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try:
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Exporter = entrypoints.get_single(
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'nbconvert.exporters.script', lang_name).load()
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except entrypoints.NoSuchEntryPoint:
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self._lang_exporters[lang_name] = None
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else:
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# TODO: passing config is wrong, but changing this revealed more complicated issues
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self._lang_exporters[lang_name] = Exporter(config=self.config, parent=self)
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return self._lang_exporters[lang_name]
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def from_notebook_node(self, nb, resources=None, **kw):
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langinfo = nb.metadata.get('language_info', {})
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# delegate to custom exporter, if specified
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exporter_name = langinfo.get('nbconvert_exporter')
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if exporter_name and exporter_name != 'script':
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self.log.debug("Loading script exporter: %s", exporter_name)
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if exporter_name not in self._exporters:
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Exporter = get_exporter(exporter_name)
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# TODO: passing config is wrong, but changing this revealed more complicated issues
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self._exporters[exporter_name] = Exporter(config=self.config, parent=self)
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exporter = self._exporters[exporter_name]
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return exporter.from_notebook_node(nb, resources, **kw)
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# Look up a script exporter for this notebook's language
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lang_name = langinfo.get('name')
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if lang_name:
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self.log.debug("Using script exporter for language: %s", lang_name)
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exporter = self._get_language_exporter(lang_name)
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if exporter is not None:
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return exporter.from_notebook_node(nb, resources, **kw)
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# Fall back to plain script export
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self.file_extension = langinfo.get('file_extension', '.txt')
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self.output_mimetype = langinfo.get('mimetype', 'text/plain')
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return super().from_notebook_node(nb, resources, **kw)
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