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"""Terminal input and output prompts."""
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from pygments.token import Token
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import sys
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from IPython.core.displayhook import DisplayHook
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from prompt_toolkit.formatted_text import fragment_list_width, PygmentsTokens
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from prompt_toolkit.shortcuts import print_formatted_text
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class Prompts(object):
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def __init__(self, shell):
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self.shell = shell
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def in_prompt_tokens(self):
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return [
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(Token.Prompt, 'In ['),
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(Token.PromptNum, str(self.shell.execution_count)),
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(Token.Prompt, ']: '),
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]
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def _width(self):
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return fragment_list_width(self.in_prompt_tokens())
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def continuation_prompt_tokens(self, width=None):
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if width is None:
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width = self._width()
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return [
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(Token.Prompt, (' ' * (width - 5)) + '...: '),
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]
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def rewrite_prompt_tokens(self):
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width = self._width()
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return [
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(Token.Prompt, ('-' * (width - 2)) + '> '),
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]
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def out_prompt_tokens(self):
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return [
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(Token.OutPrompt, 'Out['),
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(Token.OutPromptNum, str(self.shell.execution_count)),
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(Token.OutPrompt, ']: '),
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]
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class ClassicPrompts(Prompts):
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def in_prompt_tokens(self):
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return [
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(Token.Prompt, '>>> '),
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]
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def continuation_prompt_tokens(self, width=None):
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return [
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(Token.Prompt, '... ')
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]
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def rewrite_prompt_tokens(self):
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return []
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def out_prompt_tokens(self):
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return []
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class RichPromptDisplayHook(DisplayHook):
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"""Subclass of base display hook using coloured prompt"""
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def write_output_prompt(self):
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sys.stdout.write(self.shell.separate_out)
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# If we're not displaying a prompt, it effectively ends with a newline,
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# because the output will be left-aligned.
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self.prompt_end_newline = True
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if self.do_full_cache:
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tokens = self.shell.prompts.out_prompt_tokens()
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prompt_txt = ''.join(s for t, s in tokens)
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if prompt_txt and not prompt_txt.endswith('\n'):
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# Ask for a newline before multiline output
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self.prompt_end_newline = False
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if self.shell.pt_app:
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print_formatted_text(PygmentsTokens(tokens),
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style=self.shell.pt_app.app.style, end='',
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)
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else:
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sys.stdout.write(prompt_txt)
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