365 lines
12 KiB
Python
365 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This module contains interactive widgets:
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- interactive console: a text edit made to run subprocesses interactively
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"""
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import locale
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import logging
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import os
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import sys
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from pyqode.core.api.client import PROCESS_ERROR_STRING
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from pyqode.qt.QtCore import Qt, Signal, QProcess, QProcessEnvironment
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from pyqode.qt.QtWidgets import QTextEdit
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from pyqode.qt.QtGui import QColor, QTextCursor, QFont
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def _logger():
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return logging.getLogger(__name__)
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class InteractiveConsole(QTextEdit):
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"""
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An interactive console is a QTextEdit specialised to run a process
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interactively
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The user will see the process outputs and will be able to
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interact with the process by typing some text, this text will be forwarded
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to the process stdin.
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You can customize the colors using the following attributes:
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- stdout_color: color of the process stdout
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- stdin_color: color of the user inputs. Green by default
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- app_msg_color: color for custom application message (
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process started, process finished)
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- stderr_color: color of the process stderr
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"""
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#: Signal emitted when the process has finished.
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process_finished = Signal(int)
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def __init__(self, parent=None):
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super(InteractiveConsole, self).__init__(parent)
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self._stdout_col = QColor("#404040")
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self._app_msg_col = QColor("#4040FF")
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self._stdin_col = QColor("#22AA22")
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self._stderr_col = QColor("#FF0000")
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self._write_app_messages = True
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self._process_name = ''
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self.process = None
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self._args = None
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self._usr_buffer = ""
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self._clear_on_start = True
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self._merge_outputs = False
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self._running = False
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self._writer = self.write
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self._user_stop = False
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font = "monospace"
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if sys.platform == "win32":
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font = "Consolas"
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elif sys.platform == "darwin":
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font = 'Monaco'
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self._font_family = font
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self.setFont(QFont(font, 10))
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self.setReadOnly(True)
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def set_writer(self, writer):
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"""
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Changes the writer function to handle writing to the text edit.
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A writer function must have the following prototype:
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.. code-block:: python
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def write(text_edit, text, color)
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:param writer: write function as described above.
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"""
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if self._writer != writer and self._writer:
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self._writer = None
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if writer:
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self._writer = writer
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def _on_stdout(self):
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raw = self.process.readAllStandardOutput()
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txt = bytes(raw).decode(locale.getpreferredencoding())
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self._writer(self, txt, self.stdout_color)
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def _on_stderr(self):
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txt = bytes(self.process.readAllStandardError()).decode(
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locale.getpreferredencoding())
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_logger().debug('%s', txt)
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self._writer(self, txt, self.stderr_color)
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@property
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def write_app_messages(self):
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return self._write_app_messages
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@write_app_messages.setter
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def write_app_messages(self, value):
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self._write_app_messages = value
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@property
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def background_color(self):
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""" The console background color. Default is white. """
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pal = self.palette()
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return pal.color(pal.Base)
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@background_color.setter
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def background_color(self, color):
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pal = self.palette()
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pal.setColor(pal.Base, color)
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pal.setColor(pal.Text, self.stdout_color)
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self.setPalette(pal)
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@property
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def stdout_color(self):
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""" STDOUT color. Default is black. """
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return self._stdout_col
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@stdout_color.setter
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def stdout_color(self, color):
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self._stdout_col = color
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pal = self.palette()
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pal.setColor(pal.Text, self._stdout_col)
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self.setPalette(pal)
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@property
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def stderr_color(self):
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"""
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Color for stderr output if
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:attr:`pyqode.core.widgets.InteractiveConsole.merge_outputs` is False.
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Default is Red.
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"""
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return self._stderr_col
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@stderr_color.setter
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def stderr_color(self, color):
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self._stderr_col = color
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@property
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def stdin_color(self):
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"""
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STDIN color. Default is green.
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"""
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return self._stdin_col
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@stdin_color.setter
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def stdin_color(self, color):
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self._stdin_col = color
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@property
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def app_msg_color(self):
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"""
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Color of the application messages (e.g.: 'Process started',
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'Process finished with status %d')
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"""
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return self._app_msg_col
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@app_msg_color.setter
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def app_msg_color(self, color):
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self._app_msg_col = color
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@property
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def clear_on_start(self):
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"""
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True to clear window when starting a new process. False to accumulate
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outputs.
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"""
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return self._clear_on_start
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@clear_on_start.setter
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def clear_on_start(self, value):
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self._clear_on_start = value
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@property
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def merge_outputs(self):
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"""
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Merge stderr with stdout. Default is False.
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If set to true, stderr and stdin will use the same color: stdin_color.
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"""
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return self._merge_outputs
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@merge_outputs.setter
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def merge_outputs(self, value):
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self._merge_outputs = value
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if value:
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self.process.setProcessChannelMode(QProcess.MergedChannels)
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else:
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self.process.setProcessChannelMode(QProcess.SeparateChannels)
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@property
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def is_running(self):
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"""
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Checks if the process is running.
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:return:
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"""
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return self._running
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def closeEvent(self, *args, **kwargs):
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if self.process.state() == QProcess.Running:
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self.process.terminate()
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def start_process(self, process, args=None, cwd=None, env=None):
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"""
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Starts a process interactively.
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:param process: Process to run
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:type process: str
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:param args: List of arguments (list of str)
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:type args: list
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:param cwd: Working directory
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:type cwd: str
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:param env: environment variables (dict).
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"""
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self.setReadOnly(False)
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if env is None:
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env = {}
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if args is None:
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args = []
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if not self._running:
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self.process = QProcess()
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self.process.finished.connect(self._on_process_finished)
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self.process.error.connect(self._write_error)
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self.process.readyReadStandardError.connect(self._on_stderr)
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self.process.readyReadStandardOutput.connect(self._on_stdout)
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if cwd:
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self.process.setWorkingDirectory(cwd)
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e = self.process.systemEnvironment()
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ev = QProcessEnvironment()
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for v in e:
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values = v.split('=')
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ev.insert(values[0], '='.join(values[1:]))
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for k, v in env.items():
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ev.insert(k, v)
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self.process.setProcessEnvironment(ev)
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self._running = True
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self._process_name = process
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self._args = args
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if self._clear_on_start:
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self.clear()
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self._user_stop = False
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self._write_started()
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self.process.start(process, args)
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else:
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_logger().warning('a process is already running')
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def stop_process(self):
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"""
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Stop the process (by killing it).
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"""
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_logger().debug('killing process')
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if self.process is not None:
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self._user_stop = True
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self.process.kill()
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self.setReadOnly(True)
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self._running = False
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def keyPressEvent(self, event):
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if event.key() == Qt.Key_Return or event.key() == Qt.Key_Enter:
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# send the user input to the child process
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if sys.platform == 'win32':
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self._usr_buffer += "\r"
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self._usr_buffer += "\n"
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self.process.write(bytes(
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self._usr_buffer, locale.getpreferredencoding()))
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self._usr_buffer = ""
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else:
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if event.key() != Qt.Key_Backspace:
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txt = event.text()
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self._usr_buffer += txt
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self.setTextColor(self._stdin_col)
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elif event.text().isalnum():
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self._usr_buffer = self._usr_buffer[
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0:len(self._usr_buffer) - 1]
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# text is inserted here, the text color must be defined before this
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# line
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super(InteractiveConsole, self).keyPressEvent(event)
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self.setTextColor(self._stdout_col)
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def _on_process_finished(self, exit_code, exit_status):
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if not self._user_stop:
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if self._write_app_messages:
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self._writer(
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self, "\nProcess finished with exit code %d" %
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exit_code, self._app_msg_col)
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self._running = False
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_logger().debug('process finished (exit_code=%r, exit_status=%r)',
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exit_code, exit_status)
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self.process_finished.emit(exit_code)
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self.setReadOnly(True)
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def _write_started(self):
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if not self._write_app_messages:
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return
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self._writer(self, "{0} {1}\n".format(
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self._process_name, " ".join(self._args)), self._app_msg_col)
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self._running = True
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_logger().debug('process started')
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def _write_error(self, error):
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if self._user_stop:
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self._writer(self, '\nProcess stopped by the user',
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self.app_msg_color)
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else:
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self._writer(self, "Failed to start {0} {1}\n".format(
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self._process_name, " ".join(self._args)), self.app_msg_color)
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err = PROCESS_ERROR_STRING[error]
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self._writer(self, "Error: %s" % err, self.stderr_color)
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_logger().debug('process error: %s', err)
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self._running = False
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@staticmethod
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def write(text_edit, text, color):
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"""
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Default write function. Move the cursor to the end and insert text with
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the specified color.
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:param text_edit: QInteractiveConsole instance
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:type text_edit: pyqode.widgets.QInteractiveConsole
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:param text: Text to write
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:type text: str
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:param color: Desired text color
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:type color: QColor
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"""
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text_edit.moveCursor(QTextCursor.End)
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text_edit.setTextColor(color)
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text_edit.insertPlainText(text)
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text_edit.moveCursor(QTextCursor.End)
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def apply_color_scheme(self, color_scheme):
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"""
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Apply a pygments color scheme to the console.
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As there is not a 1 to 1 mapping between color scheme formats and
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console formats, we decided to make the following mapping (it usually
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looks good for most of the available pygments styles):
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- stdout_color = normal color
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- stderr_color = red (lighter if background is dark)
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- stdin_color = numbers color
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- app_msg_color = string color
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- bacgorund_color = background
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:param color_scheme: pyqode.core.api.ColorScheme to apply
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"""
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self.stdout_color = color_scheme.formats['normal'].foreground().color()
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self.stdin_color = color_scheme.formats['number'].foreground().color()
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self.app_msg_color = color_scheme.formats[
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'string'].foreground().color()
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self.background_color = color_scheme.background
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if self.background_color.lightness() < 128:
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self.stderr_color = QColor('#FF8080')
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else:
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self.stderr_color = QColor('red')
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