Source code for bokeh.command.subcommands.file_output

# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
# The full license is in the file LICENSE.txt, distributed with this software.
''' Abstract base class for subcommands that output to a file (or stdout).


# Boilerplate
from __future__ import annotations

import logging # isort:skip
log = logging.getLogger(__name__)

# Imports

# Standard library imports
import argparse
import sys
from abc import abstractmethod
from os.path import splitext

# Bokeh imports
from ...document import Document
from ..subcommand import (
from ..util import build_single_handler_applications, die

# Globals and constants

__all__ = (

# General API

# Dev API

[docs]class FileOutputSubcommand(Subcommand): ''' Abstract subcommand to output applications as some type of file. ''' # subtype must set this instance attribute to file extension extension: str
[docs] @classmethod def files_arg(cls, output_type_name: str) -> Arg: ''' Returns a positional arg for ``files`` to specify file inputs to the command. Subclasses should include this to their class ``args``. Example: .. code-block:: python class Foo(FileOutputSubcommand): args = ( FileOutputSubcommand.files_arg("FOO"), # more args for Foo ) + FileOutputSubcommand.other_args() ''' return ('files', Argument( metavar='DIRECTORY-OR-SCRIPT', nargs='+', help=("The app directories or scripts to generate %s for" % (output_type_name)), default=None ))
[docs] @classmethod def other_args(cls) -> Args: ''' Return args for ``-o`` / ``--output`` to specify where output should be written, and for a ``--args`` to pass on any additional command line args to the subcommand. Subclasses should append these to their class ``args``. Example: .. code-block:: python class Foo(FileOutputSubcommand): args = ( FileOutputSubcommand.files_arg("FOO"), # more args for Foo ) + FileOutputSubcommand.other_args() ''' return ( (('-o', '--output'), Argument( metavar='FILENAME', action='append', type=str, help="Name of the output file or - for standard output." )), ('--args', Argument( metavar='COMMAND-LINE-ARGS', nargs="...", help="Any command line arguments remaining are passed on to the application handler", )), )
[docs] def filename_from_route(self, route: str, ext: str) -> str: ''' ''' if route == "/": base = "index" else: base = route[1:] return "%s.%s" % (base, ext)
[docs] def invoke(self, args: argparse.Namespace) -> None: ''' ''' argvs = { f : args.args for f in args.files} applications = build_single_handler_applications(args.files, argvs) if args.output is None: outputs: list[str] = [] else: outputs = list(args.output) # copy so we can pop from it if len(outputs) > len(applications): die("--output/-o was given too many times (%d times for %d applications)" % (len(outputs), len(applications))) for (route, app) in applications.items(): doc = app.create_document() if len(outputs) > 0: filename = outputs.pop(0) else: filename = self.filename_from_route(route, self.extension) self.write_file(args, filename, doc)
[docs] def write_file(self, args: argparse.Namespace, filename: str, doc: Document) -> None: ''' ''' def write_str(content: str, filename: str) -> None: if filename == "-": print(content) else: with open(filename, "w", encoding="utf-8") as file: file.write(content) self.after_write_file(args, filename, doc) def write_bytes(content: bytes, filename: str) -> None: if filename == "-": sys.stdout.buffer.write(content) else: with open(filename, "wb") as f: f.write(content) self.after_write_file(args, filename, doc) contents = self.file_contents(args, doc) if isinstance(contents, str): write_str(contents, filename) elif isinstance(contents, bytes): write_bytes(contents, filename) else: if filename == "-" or len(contents) <= 1: def indexed(i: int) -> str: return filename else: def indexed(i: int) -> str: root, ext = splitext(filename) return f"{root}_{i}{ext}" for i, content in enumerate(contents): if isinstance(content, str): write_str(content, indexed(i)) elif isinstance(content, bytes): write_bytes(content, indexed(i))
# can be overridden optionally
[docs] def after_write_file(self, args: argparse.Namespace, filename: str, doc: Document) -> None: ''' ''' pass
[docs] @abstractmethod def file_contents(self, args: argparse.Namespace, doc: Document) -> str | bytes | list[str] | list[bytes]: ''' Subclasses must override this method to return the contents of the output file for the given doc. subclassed methods return different types: str: html, json bytes: SVG, png Raises: NotImplementedError ''' raise NotImplementedError()
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