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externalapp.py
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externalapp.py
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# -*- coding: utf-8 -*-
# This file is part of MyPaint.
# Copyright (C) 2014-2019 by the MyPaint Development Team
# Copyright (C) 2014 by Andrew Chadwick <a.t.chadwick@gmail.com>
#
# This program 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 2 of the License, or
# (at your option) any later version.
"""External application launching and monitoring"""
## Imports
from __future__ import division, print_function
import weakref
import os.path
import os
import subprocess
import gui.document # noqa
from lib.gettext import gettext as _
from lib.gettext import C_
from lib.layer.core import LayerBase # noqa
from lib.gibindings import Gio
from lib.gibindings import Pango
from lib.gibindings import Gtk
import lib.xml
import logging
logger = logging.getLogger(__name__)
## UI string consts
# TRANSLATORS: Statusbar message when "Edit in External App"
# TRANSLATORS: (for a layer) is successfully initiated.
_LAUNCH_SUCCESS_MSG = _(u"Launched {app_name} to edit layer “{layer_name}”")
# TRANSLATORS: Statusbar message shown when the app chosen for
# TRANSLATORS: "Edit in External App" (for a layer) failed to open.
_LAUNCH_FAILED_MSG = _(u"Error: failed to launch {app_name} to edit "
u"layer “{layer_name}”")
# TRANSLATORS: Statusbar message for when an "Edit in External App"
# TRANSLATORS: operation is cancelled by the user before it starts.
_LAUNCH_CANCELLED_MSG = _(u"Editing cancelled. You can still edit "
u"“{layer_name}” from the Layers menu.")
# TRANSLATORS: This is a statusbar message shown when
# TRANSLATORS: a layer is updated from an external edit
_LAYER_UPDATED_MSG = _(u"Updated layer “{layer_name}” with external edits")
_LAYER_UPDATE_FAILED_MSG = C_(
"Edit in External App (statusbar message)",
u"Failed to update layer with external edits from “{file_basename}”.",
)
# Restoration of environment variables for launch context.
# Required (in some cases) for launching programs for external
# editing, and for opening web browsers, from appimages.
_MYP_ENV_NAME = 'MYPAINT_ENV_CLEAN'
_ORIGINAL_ENV = None
# Required for opening web browsers from the appimages,
# relevant for bug reports, brush packs, and online help.
if _MYP_ENV_NAME in os.environ:
_Popen = subprocess.Popen
class AppImagePopen(_Popen):
def __init__(self, cmd, *args, **kwargs):
kwargs["env"] = original_environ()
super(AppImagePopen, self).__init__(cmd, *args, **kwargs)
subprocess.Popen = AppImagePopen
def original_environ():
"""Reads the outer environment and returns it as a dict
This is only used by the appimage builds, where the outer
environment is stored with null separators in a temp file.
"""
global _ORIGINAL_ENV
if _MYP_ENV_NAME not in os.environ:
return os.environ
elif _ORIGINAL_ENV is None:
with open(os.environ[_MYP_ENV_NAME]) as f:
orig = f.read()
_ORIGINAL_ENV = {
varname: value for
varname, value in
(s.split('=', 1)for s in orig.split('\0') if '=' in s)
} if orig else {}
return _ORIGINAL_ENV
def restore_env(ctx):
"""Clear existing envvars in context & use the given envvars instead
This is used to restore the original environment when starting
external editing with an environment that may lead to e.g.
incompatible or non-existing versions of libraries being linked
by the external application, instead of the correct ones.
Relies on the existence of an environment variable named
``MYPAINT_ENV_CLEAN``; if it is undefined, this is a no-op.
If it is defined, it should contain a string of K=V statements
separated by newlines.
Currently this is only used by (and necessary for) appimages.
:param ctx: a launch context
"""
clean = os.environ.get(_MYP_ENV_NAME, None)
if clean is None:
return
dirty = ctx.get_environment()
# Unfortunately there is no function for replacing the env in one go,
# so we loop through and unset/set each name/pair instead.
# If startup time needs to be reduced by (at most) a few ms:s,
# the dirty/clean list/dict should both be safe to cache.
for varname, __ in (s.split('=', 1) for s in dirty):
ctx.unsetenv(varname)
for varname, value in original_environ().items():
ctx.setenv(varname, value)
# Class definitions
class OpenWithDialog (Gtk.Dialog):
"""Choose an app from those recommended for a type"""
ICON_SIZE = Gtk.IconSize.DIALOG
SPECIFIC_FILE_MSG = _(
u"MyPaint needs to edit a file of type \u201c{type_name}\u201d "
u"({content_type}). What application should it use?"
)
GENERIC_MSG = _(
u"What application should MyPaint use for editing files of "
u"type \u201c{type_name}\u201d ({content_type})?"
)
def __init__(self, content_type, specific_file=False):
Gtk.Dialog.__init__(self)
self.set_title(_(u"Open With…"))
self.add_button(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL)
self.add_button(Gtk.STOCK_OK, Gtk.ResponseType.OK)
self.set_default_response(Gtk.ResponseType.CANCEL)
self.set_response_sensitive(Gtk.ResponseType.OK, False)
self.connect("show", self._show_cb)
content_box = self.get_content_area()
content_box.set_border_width(12)
content_box.set_spacing(12)
msg_template = self.GENERIC_MSG
if specific_file:
msg_template = self.SPECIFIC_FILE_MSG
msg_text = msg_template.format(
content_type=content_type,
type_name=Gio.content_type_get_description(content_type),
)
msg_label = Gtk.Label(label=msg_text)
msg_label.set_single_line_mode(False)
msg_label.set_line_wrap(True)
msg_label.set_alignment(0.0, 0.5)
content_box.pack_start(msg_label, False, False, 0)
default_app = Gio.AppInfo.get_default_for_type(content_type, False)
default_iter = None
app_list_store = Gtk.ListStore(object)
apps = Gio.AppInfo.get_all_for_type(content_type)
for app in apps:
if not app.should_show():
continue
row_iter = app_list_store.append([app])
if default_iter is not None:
continue
if default_app and Gio.AppInfo.equal(app, default_app):
default_iter = row_iter
# TreeView to show available apps for this content type
view = Gtk.TreeView()
view.set_model(app_list_store)
view.set_headers_clickable(False)
view.set_headers_visible(False)
view.connect("row-activated", self._row_activated_cb)
view_scrolls = Gtk.ScrolledWindow()
view_scrolls.set_shadow_type(Gtk.ShadowType.IN)
view_scrolls.add(view)
view_scrolls.set_size_request(375, 225)
content_box.pack_start(view_scrolls, True, True, 0)
# Column 0: application icon
cell = Gtk.CellRendererPixbuf()
col = Gtk.TreeViewColumn(_("Icon"), cell)
col.set_cell_data_func(cell, self._app_icon_datafunc)
icon_size_ok, icon_w, icon_h = Gtk.icon_size_lookup(self.ICON_SIZE)
if icon_size_ok:
col.set_min_width(icon_w)
col.set_expand(False)
col.set_resizable(False)
view.append_column(col)
# Column 1: application name
cell = Gtk.CellRendererText()
cell.set_property("ellipsize", Pango.EllipsizeMode.END)
cell.set_property("editable", False)
col = Gtk.TreeViewColumn(_("Name"), cell)
col.set_cell_data_func(cell, self._app_name_datafunc)
col.set_expand(True)
col.set_min_width(150)
view.append_column(col)
# Selection: mode and initial value
selection = view.get_selection()
selection.set_mode(Gtk.SelectionMode.SINGLE)
if default_iter:
selection.select_iter(default_iter)
self.set_default_response(Gtk.ResponseType.OK)
self.set_response_sensitive(Gtk.ResponseType.OK, True)
selection.connect("changed", self._selection_changed_cb)
# Results go here
self.selected_appinfo = default_app #: The app the user chose
def _show_cb(self, dialog):
content_box = self.get_content_area()
content_box.show_all()
def _app_name_datafunc(self, col, cell, model, it, data):
app = model.get_value(it, 0)
name = app.get_display_name()
desc = app.get_description()
if desc is not None:
markup_template = "<b>{name}</b>\n{description}"
else:
markup_template = "<b>{name}</b>\n<i>({description})</i>"
desc = _("no description")
markup = markup_template.format(
name=lib.xml.escape(name),
description=lib.xml.escape(desc),
)
cell.set_property("markup", markup)
def _app_icon_datafunc(self, col, cell, model, it, data):
app = model.get_value(it, 0)
icon = app.get_icon()
cell.set_property("gicon", icon)
cell.set_property("stock-size", self.ICON_SIZE)
def _row_activated_cb(self, view, treepath, column):
model = view.get_model()
treeiter = model.get_iter(treepath)
if treeiter:
appinfo = model.get_value(treeiter, 0)
self.selected_appinfo = appinfo
self.response(Gtk.ResponseType.OK)
def _selection_changed_cb(self, selection):
model, selected_iter = selection.get_selected()
if selected_iter:
appinfo = model.get_value(selected_iter, 0)
self.selected_appinfo = appinfo
self.set_response_sensitive(Gtk.ResponseType.OK, True)
self.set_default_response(Gtk.ResponseType.OK)
else:
self.selected_appinfo = None
self.set_response_sensitive(Gtk.ResponseType.OK, False)
self.set_default_response(Gtk.ResponseType.CANCEL)
class LayerEditManager (object):
"""Launch external apps to edit layers, monitoring file changes"""
def __init__(self, doc):
"""Initialize, attached to a document controller
:param gui.document.Document doc: Owning controller
"""
super(LayerEditManager, self).__init__()
self._doc = doc
self._active_edits = []
def begin(self, layer):
"""Begin editing a layer in an external application
:param LayerBase layer: Layer to start editing
This starts the edit procedure by launching a chosen
application for a tempfile requested from the layer. The file is
monitored for changes, which are loaded back into the associated
layer automatically.
Each invocation of this callback from ``EditLayerExternally``
creates a new tempfile for editing the layer, and launches a new
instance of the external app. Previous tempfiles are removed
from monitoring in favour of the new one.
"""
logger.info("Starting external edit for %r...", layer.name)
try:
new_edit_tempfile = layer.new_external_edit_tempfile
except AttributeError:
return
file_path = new_edit_tempfile()
if os.name == 'nt':
self._begin_file_edit_using_startfile(file_path, layer)
# Avoid segfault: https://github.com/mypaint/mypaint/issues/531
# Upstream: https://bugzilla.gnome.org/show_bug.cgi?id=758248
else:
self._begin_file_edit_using_gio(file_path, layer)
self._begin_file_monitoring_using_gio(file_path, layer)
def _begin_file_edit_using_startfile(self, file_path, layer):
logger.info("Using os.startfile() to edit %r", file_path)
os.startfile(file_path, "edit")
self._doc.app.show_transient_message(
_LAUNCH_SUCCESS_MSG.format(
app_name = "(unknown Win32 app)", # FIXME: needs i18n
layer_name = layer.name,
))
def _begin_file_edit_using_gio(self, file_path, layer):
logger.info("Using OpenWithDialog and GIO to open %r", file_path)
logger.debug("Querying file path for info")
file = Gio.File.new_for_path(file_path)
flags = Gio.FileQueryInfoFlags.NONE
attr = Gio.FILE_ATTRIBUTE_STANDARD_FAST_CONTENT_TYPE
file_info = file.query_info(attr, flags, None)
file_type = file_info.get_attribute_string(attr)
logger.debug("Creating and launching external layer edit dialog")
dialog = OpenWithDialog(file_type, specific_file=True)
dialog.set_modal(True)
dialog.set_transient_for(self._doc.app.drawWindow)
dialog.set_position(Gtk.WindowPosition.CENTER)
response = dialog.run()
dialog.destroy()
if response != Gtk.ResponseType.OK:
self._doc.app.show_transient_message(
_LAUNCH_CANCELLED_MSG.format(
layer_name=layer.name,
))
return
appinfo = dialog.selected_appinfo
assert appinfo is not None
disp = self._doc.tdw.get_display()
launch_ctx = disp.get_app_launch_context()
restore_env(launch_ctx)
logger.debug(
"Launching %r with %r (user-chosen app for %r)",
appinfo.get_name(),
file_path,
file_type,
)
launched_app = appinfo.launch([file], launch_ctx)
if not launched_app:
self._doc.app.show_transient_message(
_LAUNCH_FAILED_MSG.format(
app_name=appinfo.get_name(),
layer_name=layer.name,
))
logger.error(
"Failed to launch %r with %r",
appinfo.get_name(),
file_path,
)
return
self._doc.app.show_transient_message(
_LAUNCH_SUCCESS_MSG.format(
app_name=appinfo.get_name(),
layer_name=layer.name,
))
def _begin_file_monitoring_using_gio(self, file_path, layer):
self._cleanup_stale_monitors(added_layer=layer)
logger.debug("Begin monitoring %r for changes (layer=%r)",
file_path, layer)
file = Gio.File.new_for_path(file_path)
file_mon = file.monitor_file(Gio.FileMonitorFlags.NONE, None)
file_mon.connect("changed", self._file_changed_cb)
edit_info = (file_mon, weakref.ref(layer), file, file_path)
self._active_edits.append(edit_info)
def commit(self, layer):
"""Commit a layer's ongoing external edit"""
logger.debug("Commit %r's current tempfile", layer)
self._cleanup_stale_monitors()
for mon, layer_ref, file, file_path in self._active_edits:
if layer_ref() is not layer:
continue
model = self._doc.model
file_basename = os.path.basename(file_path)
try:
model.update_layer_from_external_edit_tempfile(
layer,
file_path,
)
except Exception as ex:
logger.error(
"Loading tempfile for %r (%r) failed: %r",
layer,
file_path,
str(ex),
)
status_msg = _LAYER_UPDATE_FAILED_MSG.format(
file_basename = file_basename,
layer_name = layer.name,
)
else:
status_msg = _LAYER_UPDATED_MSG.format(
file_basename = file_basename,
layer_name = layer.name,
)
self._doc.app.show_transient_message(status_msg)
return
def _file_changed_cb(self, mon, file1, file2, event_type):
self._cleanup_stale_monitors()
if event_type == Gio.FileMonitorEvent.DELETED:
logger.debug("File %r was deleted", file1.get_path())
self._cleanup_stale_monitors(deleted_file=file1)
return
if event_type == Gio.FileMonitorEvent.CHANGES_DONE_HINT:
logger.debug("File %r was changed", file1.get_path())
for a_mon, layer_ref, file, file_path in self._active_edits:
if a_mon is mon:
layer = layer_ref()
self.commit(layer)
return
def _cleanup_stale_monitors(self, added_layer=None, deleted_file=None):
for i in reversed(range(len(self._active_edits))):
mon, layer_ref, file, file_path = self._active_edits[i]
layer = layer_ref()
stale = False
if layer is None:
logger.info("Removing monitor for garbage-collected layer")
stale = True
elif layer is added_layer:
logger.info("Replacing monitor for already-tracked layer")
stale = True
if file is deleted_file:
logger.info("Removing monitor for deleted file")
stale = True
if stale:
mon.cancel()
logger.info("File %r is no longer monitored", file.get_path())
self._active_edits[i:i+1] = []
if __name__ == '__main__':
logging.basicConfig(level=logging.DEBUG)
dialog = OpenWithDialog("image/svg+xml")
# dialog = OpenWithDialog("text/plain")
# dialog = OpenWithDialog("image/jpeg")
# dialog = OpenWithDialog("application/xml")
response = dialog.run()
if response == Gtk.ResponseType.OK:
app_name = dialog.selected_appinfo.get_name()
logger.debug("AppInfo chosen: %r", app_name)
else:
logger.debug("Dialog was cancelled")