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#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2017-2022 Chris Lamb <lamby@debian.org>
#
# diffoscope is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# diffoscope is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with diffoscope. If not, see <https://www.gnu.org/licenses/>.
import os
import logging
from ..profiling import profile
from ..utils import format_bytes
from .text import TextPresenter
from .json import JSONPresenter
from .html import HTMLPresenter, HTMLDirectoryPresenter
from .markdown import MarkdownTextPresenter
from .restructuredtext import RestructuredTextPresenter
logger = logging.getLogger(__name__)
class PresenterManager:
_singleton = {}
def __init__(self):
self.__dict__ = self._singleton
if not self._singleton:
self.reset()
def reset(self):
self.config = {}
def configure(self, parsed_args):
FORMATS = {
"text": {
"klass": TextPresenter,
"target": parsed_args.text_output,
},
"html": {
"klass": HTMLPresenter,
"target": parsed_args.html_output,
},
"json": {
"klass": JSONPresenter,
"target": parsed_args.json_output,
},
"markdown": {
"klass": MarkdownTextPresenter,
"target": parsed_args.markdown_output,
},
"restructuredtext": {
"klass": RestructuredTextPresenter,
"target": parsed_args.restructuredtext_output,
},
"html_directory": {
"klass": HTMLDirectoryPresenter,
"target": parsed_args.html_output_directory,
},
}
self.config = {
k: v for k, v in FORMATS.items() if v["target"] is not None
}
# If no output specified, default to printing --text output to stdout
if not self.config:
FORMATS["text"]["target"] = "-"
self.config["text"] = FORMATS["text"]
logger.debug(
"Will generate the following presenter formats: %s",
", ".join(self.config.keys()),
)
def output(self, difference, parsed_args, has_differences):
if difference is None:
return
for name, data in self.config.items():
logger.debug("Generating %r output at %r", name, data["target"])
# As a special case for text format, write an empty file instead of
# an empty diff (with headers including the path). This lets people
# test if the file is empty.
if not has_differences and name == "text":
target = data["target"]
if target != "-":
open(target, "w").close()
continue
with profile("output", name):
data["klass"].run(data, difference, parsed_args)
size = "n/a"
if os.path.isfile(data["target"]):
size = format_bytes(os.path.getsize(data["target"]))
logger.debug(
"Generated %r output at %r (size: %s)",
name,
data["target"],
size,
)
def compute_visual_diffs(self):
"""
Don't waste time computing visual differences if we won't use them.
"""
return any(
x["klass"].supports_visual_diffs for x in self.config.values()
)
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