html_preview.py 15.7 KB
Newer Older
1 2 3
#!/usr/bin/env python3

#
4
# html_preview.py
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
#
# Copyright (C) 2015 Christian Hergert <chris@dronelabs.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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#

22
import builtins
23
import gi
24
import io
25
import locale
26 27 28 29 30
import os
import shutil
import sys
import subprocess
import threading
31

32
gi.require_version('Gtk', '3.0')
33 34 35
gi.require_version('Ide', '1.0')
gi.require_version('WebKit2', '4.0')

36
from gi.repository import Dazzle
37 38 39 40 41 42 43 44
from gi.repository import GLib
from gi.repository import Gio
from gi.repository import Gtk
from gi.repository import GObject
from gi.repository import Ide
from gi.repository import WebKit2
from gi.repository import Peas

45 46 47 48 49
try:
    locale.setlocale(locale.LC_ALL, '')
except:
    pass

50
can_preview_rst = True
51 52
can_preview_sphinx = True
old_open = None
53 54 55 56 57 58

try:
    from docutils.core import publish_string
except ImportError:
    can_preview_rst = False

59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
try:
    import sphinx
except ImportError:
    can_preview_sphinx = False

sphinx_states = {}
sphinx_override = {}


def add_override_file(path, content):
    if path in sphinx_override:
        return False
    else:
        sphinx_override[path] = content.encode('utf-8')
        return True


def remove_override_file(path):
    try:
        del sphinx_override[path]
    except KeyError:
        return False

    return True


def new_open(*args, **kwargs):
    path = args[0]
    if path in sphinx_override:
        return io.BytesIO(sphinx_override[path])

    return old_open(*args, **kwargs)

old_open = builtins.open
builtins.open = new_open

95 96
_ = Ide.gettext

97

98 99 100 101 102 103
class SphinxState():
    def __init__(self, builddir):
        self.builddir = builddir
        self.is_running = False
        self.need_build = False

104
class HtmlPreviewData(GObject.Object, Ide.ApplicationAddin):
105 106 107 108 109
    MARKDOWN_CSS = None
    MARKED_JS = None
    MARKDOWN_VIEW_JS = None

    def do_load(self, app):
110 111 112 113 114 115 116
        HtmlPreviewData.MARKDOWN_CSS = self.get_data('css/markdown.css')
        HtmlPreviewData.MARKED_JS = self.get_data('js/marked.js')
        HtmlPreviewData.MARKDOWN_VIEW_JS = self.get_data('js/markdown-view.js')

        assert HtmlPreviewData.MARKDOWN_CSS
        assert HtmlPreviewData.MARKED_JS
        assert HtmlPreviewData.MARKDOWN_VIEW_JS
117

118 119 120 121 122 123 124
    def do_unload(self, app):
        for state in sphinx_states.items():
            # Be extra sure that we are in the tmp dir
            tmpdir = GLib.get_tmp_dir()
            if state.builddir.startswith(tmpdir):
                shutil.rmtree(state.builddir)

125
    def get_data(self, name):
126 127 128
        # Hold onto the GBytes to avoid copying the buffer
        path = os.path.join('/org/gnome/builder/plugins/html_preview', name)
        return Gio.resources_lookup_data(path, 0)
129

130 131 132
class HtmlWorkbenchAddin(GObject.Object, Ide.WorkbenchAddin):
    def do_load(self, workbench):
        self.workbench = workbench
133

134
        group = Gio.SimpleActionGroup()
135

136
        self.install_action = Gio.SimpleAction(name='install-docutils', enabled=True)
137 138
        self.install_action.connect('activate', lambda *_: self.install_docutils())
        group.insert(self.install_action)
139

140 141
        self.install_action = Gio.SimpleAction(name='install-sphinx', enabled=True)
        self.install_action.connect('activate', lambda *_: self.install_sphinx())
142 143 144 145
        group.insert(self.install_action)

        self.workbench.insert_action_group('html-preview', group)

146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169
    def do_unload(self, workbench):
        self.workbench = None

    def install_docutils(self):
        transfer = Ide.PkconTransfer(packages=['python3-docutils'])
        context = self.workbench.get_context()
        manager = context.get_transfer_manager()

        manager.execute_async(transfer, None, self.docutils_installed, None)

    def install_sphinx(self):
        transfer = Ide.PkconTransfer(packages=['python3-sphinx'])
        context = self.workbench.get_context()
        manager = context.get_transfer_manager()

        manager.execute_async(transfer, None, self.sphinx_installed, None)

    def docutils_installed(self, object, result, data):
        global can_preview_rst
        global publish_string

        try:
            from docutils.core import publish_string
        except ImportError:
170
            Ide.warning("Failed to load docutils.core module")
171 172 173 174 175 176 177 178 179 180 181 182
            return

        can_preview_rst = True
        self.workbench.pop_message('org.gnome.builder.docutils.install')

    def sphinx_installed(self, object, result, data):
        global can_preview_sphinx
        global sphinx

        try:
            import sphinx
        except ImportError:
183
            Ide.warning("Failed to load sphinx module")
184 185 186 187 188 189 190 191 192 193 194 195 196 197
            return

        can_preview_sphinx = True
        self.workbench.pop_message('org.gnome.builder.sphinx.install')


class HtmlPreviewAddin(GObject.Object, Ide.EditorViewAddin):
    def do_load(self, view):
        self.workbench = view.get_ancestor(Ide.Workbench)
        self.view = view
        self.can_preview = False
        self.sphinx_basedir = None
        self.sphinx_builddir = None

198 199
        group = view.get_action_group('editor-view')

200
        self.action = Gio.SimpleAction(name='preview-as-html', enabled=True)
201
        self.action.connect('activate', self.preview_activated)
202
        group.add_action(self.action)
203

204
        document = view.get_buffer()
205 206 207 208 209
        language = document.get_language()
        language_id = language.get_id() if language else None

        self.do_language_changed(language_id)

210 211 212 213 214 215 216
        # Add a shortcut for activation inside the editor
        controller = Dazzle.ShortcutController.find(view)
        controller.add_command_action('org.gnome.builder.html-preview.preview',
                                      '<Control><Alt>p',
                                      Dazzle.ShortcutPhase.CAPTURE,
                                      'editor-view.preview-as-html')

217
    def do_unload(self, view):
218 219 220 221 222
        group = view.get_action_group('editor-view')
        group.remove_action('preview-as-html')

        self.view = None
        self.workbench = None
223 224

    def do_language_changed(self, language_id):
225
        enabled = (language_id in ('html', 'markdown', 'rst'))
226
        self.action.set_enabled(enabled)
227 228 229 230 231
        self.lang_id = language_id
        self.can_preview = enabled

        if self.lang_id == 'rst':
            if not self.sphinx_basedir:
232
                document = self.view.get_buffer()
233 234 235 236 237
                path = document.get_file().get_file().get_path()
                self.sphinx_basedir = self.search_sphinx_base_dir(path)

            if self.sphinx_basedir:
                self.sphinx_builddir = self.setup_sphinx_states(self.sphinx_basedir)
238

239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
        if not enabled:
            self.sphinx_basedir = None
            self.sphinx_builddir = None

    def setup_sphinx_states(self, basedir):
        global sphinx_states

        if basedir in sphinx_states:
            state = sphinx_states[basedir]
            sphinx_builddir = state.builddir
        else:
            sphinx_builddir = GLib.Dir.make_tmp('gnome-builder-sphinx-build-XXXXXX')
            state = SphinxState(sphinx_builddir)
            sphinx_states[basedir] = state

        return sphinx_builddir

256
    def preview_activated(self, *args):
257 258
        global can_preview_rst

259 260
        view = self.view
        if view is None:
261 262
            return

263 264 265 266 267 268 269 270 271
        if self.lang_id == 'rst':
            if self.sphinx_basedir:
                if not can_preview_sphinx:
                    self.show_missing_sphinx_message(view)
                    return
            elif not can_preview_rst:
                self.show_missing_docutils_message(view)
                return

272
        document = view.get_buffer()
273 274 275 276 277
        web_view = HtmlPreviewView(document,
                                   self.sphinx_basedir,
                                   self.sphinx_builddir,
                                   visible=True)

278 279 280 281 282 283 284 285 286
        column = view.get_ancestor(Ide.LayoutGridColumn)
        grid = column.get_ancestor(Ide.LayoutGrid)
        index = grid.child_get_property(column, 'index')

        # If we are past first stack, use the 0 column stack
        # otherwise create or reuse a stack to the right.
        index += -1 if index > 0 else 1
        column = grid.get_nth_column(index)
        column.add(web_view)
287

288
        self.action.set_enabled(False)
289
        web_view.connect('destroy', self.web_view_destroyed)
290

291
    def web_view_destroyed(self, web_view, *args):
292 293
        self.action.set_enabled(True)

294 295 296 297
    def search_sphinx_base_dir(self, path):
        context = self.workbench.get_context()
        vcs = context.get_vcs()
        working_dir = vcs.get_working_directory().get_path()
298

299 300 301 302 303
        try:
            if os.path.commonpath([working_dir, path]) != working_dir:
                working_dir = '/'
        except:
            working_dir = '/'
304

305 306
        folder = os.path.dirname(path)
        level = 10
307

308 309 310 311 312
        while level > 0:
            files = os.scandir(folder)
            for file in files:
                if file.name == 'conf.py':
                    return folder
313

314 315 316 317 318 319 320
            if folder == working_dir:
                return None

            level -= 1
            folder = os.path.dirname(folder)

    def show_missing_docutils_message(self, view):
321 322 323 324 325 326 327 328 329
        message = Ide.WorkbenchMessage(
            id='org.gnome.builder.docutils.install',
            title=_('Your computer is missing python3-docutils'),
            show_close_button=True,
            visible=True)

        message.add_action(_('Install'), 'html-preview.install-docutils')
        self.workbench.push_message(message)

330 331 332 333 334 335
    def show_missing_sphinx_message(self, view):
        message = Ide.WorkbenchMessage(
            id='org.gnome.builder.sphinx.install',
            title=_('Your computer is missing python3-sphinx'),
            show_close_button=True,
            visible=True)
336

337 338
        message.add_action(_('Install'), 'html-preview.install-sphinx')
        self.workbench.push_message(message)
339

340

341
class HtmlPreviewView(Ide.LayoutView):
342
    markdown = False
343
    rst = False
344

345 346 347
    def __init__(self, document, sphinx_basedir, sphinx_builddir, *args, **kwargs):
        global old_open

348
        super().__init__(*args, **kwargs)
349 350 351

        self.sphinx_basedir = sphinx_basedir
        self.sphinx_builddir = sphinx_builddir
352 353 354 355 356
        self.document = document

        self.webview = WebKit2.WebView(visible=True, expand=True)
        self.add(self.webview)

357 358 359
        settings = self.webview.get_settings()
        settings.enable_html5_local_storage = False

360
        language = document.get_language()
361 362 363 364 365 366
        if language:
            id = language.get_id()
            if id == 'markdown':
                self.markdown = True
            elif id == 'rst':
                self.rst = True
367

368
        document.connect('notify::title', self.on_title_changed)
369
        document.connect('changed', self.on_changed)
370
        self.webview.connect('destroy', self.web_view_destroyed)
371

372
        self.on_changed(document)
373 374 375 376
        self.on_title_changed(document)

    def on_title_changed(self, buffer):
        self.set_title("%s %s" % (buffer.get_title(), _("(Preview)")))
377

378 379 380
    def web_view_destroyed(self, web_view):
        self.document.disconnect_by_func(self.on_changed)

381 382
    def get_markdown(self, text):
        text = text.replace("\"", "\\\"").replace("\n", "\\n")
383
        params = (HtmlPreviewData.MARKDOWN_CSS.get_data().decode('UTF-8'),
384
                  text,
385 386
                  HtmlPreviewData.MARKED_JS.get_data().decode('UTF-8'),
                  HtmlPreviewData.MARKDOWN_VIEW_JS.get_data().decode('UTF-8'))
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402

        return """
<html>
 <head>
  <style>%s</style>
  <script>var str="%s";</script>
  <script>%s</script>
  <script>%s</script>
 </head>
 <body onload="preview()">
  <div class="markdown-body" id="preview">
  </div>
 </body>
</html>
""" % params

403 404 405 406 407
    def get_rst(self, text, path):
        return publish_string(text,
                              writer_name='html5',
                              source_path=path,
                              destination_path=path)
408

409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463
    def get_sphinx_rst_async(self, text, path, basedir, builddir, cancellable, callback):
        task = Gio.Task.new(self, cancellable, callback)
        threading.Thread(target=self.get_sphinx_rst_worker,
                         args=[task, text, path, basedir, builddir],
                         name='sphinx-rst-thread').start()

    def purge_cache(self, basedir, builddir, document):
        path = document.get_file().get_file().get_path()
        rel_path = os.path.relpath(path, start=basedir)
        rel_path_doctree = os.path.splitext(rel_path)[0] + '.doctree'
        doctree_path = os.path.join(builddir, '.doctrees', rel_path_doctree)

        tmpdir = GLib.get_tmp_dir()
        if doctree_path.startswith(tmpdir):
            try:
                os.remove(doctree_path)
            except:
                pass

    def get_sphinx_rst_worker(self, task, text, path, basedir, builddir):
        add_override_file(path, text)

        rel_path = os.path.relpath(path, start=basedir)
        command = ['sphinx-build', '-Q', '-b', 'html', basedir, builddir, path]

        rel_path_html = os.path.splitext(rel_path)[0] + '.html'
        builddir_path = os.path.join(builddir, rel_path_html)

        result = not sphinx.build_main(command)
        remove_override_file(path)

        if not result:
            task.builddir_path = None
            task.return_error(GLib.Error('\'sphinx-build\' command error for {}'.format(path)))
            return

        task.builddir_path = builddir_path
        task.return_boolean(True)

    def get_sphinx_rst_finish(self, result):
        succes = result.propagate_boolean()
        builddir_path = result.builddir_path

        return builddir_path

    def get_sphinx_state(self, basedir):
        global sphinx_states

        try:
            state = sphinx_states[basedir]
        except KeyError:
            return None

        return state

464
    def reload(self):
465 466 467 468 469 470 471
        state = self.get_sphinx_state(self.sphinx_basedir)
        if state and state.is_running:
            state.need_build = True
            return

        gfile = self.document.get_file().get_file()
        base_uri = gfile.get_uri()
472 473 474 475 476 477

        begin, end = self.document.get_bounds()
        text = self.document.get_text(begin, end, True)

        if self.markdown:
            text = self.get_markdown(text)
478
        elif self.rst:
479 480 481 482 483 484 485 486 487 488 489 490 491 492
            if self.sphinx_basedir:
                self.purge_cache(self.sphinx_basedir, self.sphinx_builddir, self.document)
                state.is_running = True

                self.get_sphinx_rst_async(text,
                                          gfile.get_path(),
                                          self.sphinx_basedir,
                                          self.sphinx_builddir,
                                          None,
                                          self.get_sphinx_rst_cb)

                return
            else:
                text = self.get_rst(text, gfile.get_path()).decode("utf-8")
493 494 495

        self.webview.load_html(text, base_uri)

496 497 498 499 500 501 502 503 504 505 506 507
    def get_sphinx_rst_cb(self, obj, result):
        builddir_path = self.get_sphinx_rst_finish(result)
        if builddir_path:
            uri = 'file:///' + builddir_path
            self.webview.load_uri(uri)

        state = self.get_sphinx_state(self.sphinx_basedir)
        state.is_running = False
        if state.need_build:
            state.need_build = False
            self.reload()

508 509
    def on_changed(self, document):
        self.reload()