Re: [PATCH 2/6] docs-rst: automatically convert Graphviz and SVG images

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Hi Daniel, hi Mauro,

I have to say, that I lost control over our thread ;)

> v3: Only sphinx 1.4 (released in Mar 2016) has patches.Figure.
> Implement Markus suggestion for backwards compatability with earlier
> releases. Laurent reported this, running sphinx 1.3. Solution entirely
> untested.

I have to come back to a more systematic work, this means;
I have to test this v3 and consider what Mauro and you 
already posted.

For this, give me some time. I will send a v4 patch this weekend.

Thanks for all for comments and hints.

 -- Markus --



> Am 02.03.2017 um 16:16 schrieb Daniel Vetter <daniel.vetter@xxxxxxxx>:
> 
> From: Markus Heiser <markus.heiser@xxxxxxxxxxx>
> 
> This patch brings scalable figure, image handling and a concept to
> embed *render* markups:
> 
> * DOT (http://www.graphviz.org)
> * SVG
> 
> For image handling use the 'image' replacement::
> 
>    .. kernel-image::  svg_image.svg
>       :alt:    simple SVG image
> 
> For figure handling use the 'figure' replacement::
> 
>    .. kernel-figure::  svg_image.svg
>       :alt:    simple SVG image
> 
>       SVG image example
> 
> Embed *render* markups (or languages) like Graphviz's **DOT** is
> provided by the *render* directive.::
> 
>  .. kernel-render:: DOT
>     :alt: foobar digraph
>     :caption: Embedded **DOT** (Graphviz) code.
> 
>     digraph foo {
>      "bar" -> "baz";
>     }
> 
> The *render* directive is a concept to integrate *render* markups and
> languages, yet supported markups:
> 
> * DOT: render embedded Graphviz's **DOT**
> * SVG: render embedded Scalable Vector Graphics (**SVG**)
> 
> v2: s/DOC/DOT/ in a few places (by Daniel).
> 
> v3: Simplify stuff a bit (by Daniel):
> 
> - Remove path detection and setup/check code for that. In
>  Documentation/media/Makefile we already simply use these tools,
>  better to have one consolidated check if we want/need one. Also
>  remove the convertsvg support, we require ImageMagick's convert
>  already in the doc build, no need for a 2nd fallback.
> 
> - Use sphinx for depency tracking, remove hand-rolled version.
> 
> - Forward stderr from dot and convert, otherwise debugging issues with
>  the diagrams is impossible.
> 
> v3: Only sphinx 1.4 (released in Mar 2016) has patches.Figure.
> Implement Markus suggestion for backwards compatability with earlier
> releases. Laurent reported this, running sphinx 1.3. Solution entirely
> untested.
> 
> Cc: Jonathan Corbet <corbet@xxxxxxx>
> Cc: linux-doc@xxxxxxxxxxxxxxx
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
> Cc: Markus Heiser <markus.heiser@xxxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Markus Heiser <markus.heiser@xxxxxxxxxxx> (v1)
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> Documentation/conf.py                 |   2 +-
> Documentation/doc-guide/hello.dot     |   3 +
> Documentation/doc-guide/sphinx.rst    |  90 ++++++-
> Documentation/doc-guide/svg_image.svg |  10 +
> Documentation/process/changes.rst     |   7 +-
> Documentation/sphinx/kfigure.py       | 444 ++++++++++++++++++++++++++++++++++
> 6 files changed, 550 insertions(+), 6 deletions(-)
> create mode 100644 Documentation/doc-guide/hello.dot
> create mode 100644 Documentation/doc-guide/svg_image.svg
> create mode 100644 Documentation/sphinx/kfigure.py
> 
> diff --git a/Documentation/conf.py b/Documentation/conf.py
> index f6823cf01275..e3f537ce2935 100644
> --- a/Documentation/conf.py
> +++ b/Documentation/conf.py
> @@ -34,7 +34,7 @@ from load_config import loadConfig
> # Add any Sphinx extension module names here, as strings. They can be
> # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
> # ones.
> -extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain']
> +extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain', 'kfigure']
> 
> # The name of the math extension changed on Sphinx 1.4
> if major == 1 and minor > 3:
> diff --git a/Documentation/doc-guide/hello.dot b/Documentation/doc-guide/hello.dot
> new file mode 100644
> index 000000000000..504621dfc595
> --- /dev/null
> +++ b/Documentation/doc-guide/hello.dot
> @@ -0,0 +1,3 @@
> +graph G {
> +      Hello -- World
> +}
> diff --git a/Documentation/doc-guide/sphinx.rst b/Documentation/doc-guide/sphinx.rst
> index 532d65b70500..b902744ce7dd 100644
> --- a/Documentation/doc-guide/sphinx.rst
> +++ b/Documentation/doc-guide/sphinx.rst
> @@ -34,8 +34,10 @@ format-specific subdirectories under ``Documentation/output``.
> 
> To generate documentation, Sphinx (``sphinx-build``) must obviously be
> installed. For prettier HTML output, the Read the Docs Sphinx theme
> -(``sphinx_rtd_theme``) is used if available. For PDF output, ``rst2pdf`` is also
> -needed. All of these are widely available and packaged in distributions.
> +(``sphinx_rtd_theme``) is used if available. For PDF output you'll also need
> +``XeLaTeX`` and CairoSVG (http://cairosvg.org) or alternatively ``convert(1)``
> +from ImageMagick (https://www.imagemagick.org). All of these are widely
> +available and packaged in distributions.
> 
> To pass extra options to Sphinx, you can use the ``SPHINXOPTS`` make
> variable. For example, use ``make SPHINXOPTS=-v htmldocs`` to get more verbose
> @@ -232,3 +234,87 @@ Rendered as:
>       * .. _`last row`:
> 
>         - column 3
> +
> +
> +Figures & Images
> +================
> +
> +If you want to add an image, you should use the ``kernel-figure`` and
> +``kernel-image`` directives. E.g. to insert a figure with a scalable
> +image format use SVG::
> +
> +    .. kernel-figure::  svg_image.svg
> +       :alt:    simple SVG image
> +
> +       SVG image example
> +
> +.. kernel-figure::  svg_image.svg
> +   :alt:    simple SVG image
> +
> +   SVG image example
> +
> +The kernel figure (and image) directive support **DOT** formated files, see
> +
> +* DOT: http://graphviz.org/pdf/dotguide.pdf
> +* Graphviz: http://www.graphviz.org/content/dot-language
> +
> +A simple example::
> +
> +  .. kernel-figure::  hello.dot
> +     :alt:    hello world
> +
> +     DOT's hello world example
> +
> +.. kernel-figure::  hello.dot
> +   :alt:    hello world
> +
> +   DOT's hello world example
> +
> +Embed *render* markups (or languages) like Graphviz's **DOT** is provided by the
> +``kernel-render`` directives.::
> +
> +  .. kernel-render:: DOT
> +     :alt: foobar digraph
> +     :caption: Embedded **DOT** (Graphviz) code.
> +
> +     digraph foo {
> +      "bar" -> "baz";
> +     }
> +
> +How this will be rendered depends on the installed tools. If Graphviz is
> +installed, you will see an vector image. If not the raw markup is inserted as
> +*literal-block*.
> +
> +.. kernel-render:: DOT
> +   :alt: foobar digraph
> +   :caption: Embedded **DOT** (Graphviz) code.
> +
> +   digraph foo {
> +      "bar" -> "baz";
> +   }
> +
> +The *render* directive has all the options known from the *figure* directive,
> +plus option ``caption``.  If ``caption`` has a value, a *figure* node is
> +inserted. If not, a *image* node is inserted.
> +
> +Embedded **SVG**::
> +
> +  .. kernel-render:: SVG
> +     :caption: Embedded **SVG** markup.
> +     :alt: so-nw-arrow
> +
> +     <?xml version="1.0" encoding="UTF-8"?>
> +     <svg xmlns="http://www.w3.org/2000/svg"; version="1.1" ...>
> +        ...
> +     </svg>
> +
> +.. kernel-render:: SVG
> +   :caption: Embedded **SVG** markup.
> +   :alt: so-nw-arrow
> +
> +   <?xml version="1.0" encoding="UTF-8"?>
> +   <svg xmlns="http://www.w3.org/2000/svg";
> +     version="1.1" baseProfile="full" width="70px" height="40px" viewBox="0 0 700 400">
> +   <line x1="180" y1="370" x2="500" y2="50" stroke="black" stroke-width="15px"/>
> +   <polygon points="585 0 525 25 585 50" transform="rotate(135 525 25)"/>
> +   </svg>
> diff --git a/Documentation/doc-guide/svg_image.svg b/Documentation/doc-guide/svg_image.svg
> new file mode 100644
> index 000000000000..5405f85b8137
> --- /dev/null
> +++ b/Documentation/doc-guide/svg_image.svg
> @@ -0,0 +1,10 @@
> +<?xml version="1.0" encoding="UTF-8"?>
> +<!-- originate: https://commons.wikimedia.org/wiki/File:Variable_Resistor.svg -->
> +<svg xmlns="http://www.w3.org/2000/svg";
> +	version="1.1" baseProfile="full"
> +	width="70px" height="40px" viewBox="0 0 700 400">
> +	<line x1="0" y1="200" x2="700" y2="200" stroke="black" stroke-width="20px"/>
> +	<rect x="100" y="100" width="500" height="200" fill="white" stroke="black" stroke-width="20px"/>
> +	<line x1="180" y1="370" x2="500" y2="50" stroke="black" stroke-width="15px"/>
> +	<polygon points="585 0 525 25 585 50" transform="rotate(135 525 25)"/>
> +</svg>
> diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
> index 56ce66114665..e4f25038ef65 100644
> --- a/Documentation/process/changes.rst
> +++ b/Documentation/process/changes.rst
> @@ -318,9 +318,10 @@ PDF outputs, it is recommended to use version 1.4.6.
> .. note::
> 
>   Please notice that, for PDF and LaTeX output, you'll also need ``XeLaTeX``
> -  version 3.14159265. Depending on the distribution, you may also need
> -  to install a series of ``texlive`` packages that provide the minimal
> -  set of functionalities required for ``XeLaTex`` to work.
> +  version 3.14159265. Depending on the distribution, you may also need to
> +  install a series of ``texlive`` packages that provide the minimal set of
> +  functionalities required for ``XeLaTex`` to work. For PDF output you'll also
> +  need ``convert(1)`` from ImageMagick (https://www.imagemagick.org).
> 
> Other tools
> -----------
> diff --git a/Documentation/sphinx/kfigure.py b/Documentation/sphinx/kfigure.py
> new file mode 100644
> index 000000000000..cbb23e089186
> --- /dev/null
> +++ b/Documentation/sphinx/kfigure.py
> @@ -0,0 +1,444 @@
> +# -*- coding: utf-8; mode: python -*-
> +# pylint: disable=C0103
> +u"""
> +    scalable figure and image handling
> +    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +    Sphinx extension which implements scalable image handling.
> +
> +    :copyright:  Copyright (C) 2016  Markus Heiser
> +    :license:    GPL Version 2, June 1991 see Linux/COPYING for details.
> +
> +    The build for image formats depence on image's source format and output's
> +    destination format. This extension implement methods to simplify image
> +    handling from the author's POV. Directives like ``kernel-figure`` implement
> +    methods *to* always get the best output-format even if some tools are not
> +    installed.For more details take a look at ``convert_image(...)`` which is
> +    the core of all conversions.
> +
> +    * ``.. kernel-image``: for image handling / ``.. image::`` replacement
> +
> +    * ``.. kernel-figure``: for figure handling / ``.. figure::`` replacement
> +
> +    * ``.. kernel-render``: for render markup / a concept to embed *render*
> +      markups (or languages). Supported markups (see ``RENDER_MARKUP_EXT``)
> +
> +      + ``DOT``: render embedded Graphviz's **DOC**
> +      + ``SVG``: render embedded Scalable Vector Graphics (**SVG**)
> +      + ... *developable*
> +
> +    Used tools:
> +
> +    * ``dot(1)``: Graphviz (http://www.graphviz.org). If Graphviz is not
> +      available, the DOT language is inserted as literal-block.
> +
> +    * SVG to PDF: To generate PDF, you need at least one of this tools:
> +
> +      - ``convert(1)``: ImageMagick (https://www.imagemagick.org)
> +
> +    List of customizations:
> +
> +    * generate PDF from SVG / used by PDF (LaTeX) builder
> +
> +    * generate SVG (html-builder) and PDF (latex-builder) from DOT files.
> +      DOT: see http://www.graphviz.org/content/dot-language
> +
> +    """
> +
> +import os
> +from os import path
> +import subprocess
> +from hashlib import sha1
> +import sys
> +
> +from docutils import nodes
> +from docutils.statemachine import ViewList
> +from docutils.parsers.rst import directives
> +from docutils.parsers.rst.directives import images
> +try:
> +    from sphinx.directives.patches import Figure
> +except ImportError:
> +    Figure = images.Figure
> +
> +__version__  = '1.0'
> +
> +# simple helper
> +# -------------
> +
> +def mkdir(folder, mode=0o775):
> +    if not path.isdir(folder):
> +        os.makedirs(folder, mode)
> +
> +# def debug_handle(self, node):           # pylint: disable=W0613
> +#     from linuxdoc.kernel_doc import CONSOLE
> +#     CONSOLE()
> +
> +def pass_handle(self, node):           # pylint: disable=W0613
> +    pass
> +
> +# setup conversion tools and sphinx extension
> +# -------------------------------------------
> +
> +def setup(app):
> +    # image handling
> +    app.add_directive("kernel-image",  KernelImage)
> +    app.add_node(kernel_image,
> +                 html    = (visit_kernel_image, pass_handle),
> +                 latex   = (visit_kernel_image, pass_handle),
> +                 texinfo = (visit_kernel_image, pass_handle),
> +                 text    = (visit_kernel_image, pass_handle),
> +                 man     = (visit_kernel_image, pass_handle), )
> +
> +    # figure handling
> +    app.add_directive("kernel-figure", KernelFigure)
> +    app.add_node(kernel_figure,
> +                 html    = (visit_kernel_figure, pass_handle),
> +                 latex   = (visit_kernel_figure, pass_handle),
> +                 texinfo = (visit_kernel_figure, pass_handle),
> +                 text    = (visit_kernel_figure, pass_handle),
> +                 man     = (visit_kernel_figure, pass_handle), )
> +
> +    # render handling
> +    app.add_directive('kernel-render', KernelRender)
> +    app.add_node(kernel_render,
> +                 html    = (visit_kernel_render, pass_handle),
> +                 latex   = (visit_kernel_render, pass_handle),
> +                 texinfo = (visit_kernel_render, pass_handle),
> +                 text    = (visit_kernel_render, pass_handle),
> +                 man     = (visit_kernel_render, pass_handle), )
> +
> +    return dict(
> +        version = __version__,
> +        parallel_read_safe = True,
> +        parallel_write_safe = True
> +    )
> +
> +# integrate conversion tools
> +# --------------------------
> +
> +RENDER_MARKUP_EXT = {
> +    # The '.ext' must be handled by convert_image(..) function's *in_ext* input.
> +    # <name> : <.ext>
> +    'DOT'   : '.dot'
> +    , 'SVG' : '.svg'
> +}
> +
> +def convert_image(img_node, translator):  # pylint: disable=R0912
> +    """Convert an image node for the builder.
> +
> +    Different builder prefer different image formats, e.g. *latex* builder
> +    prefer PDF while *html* builder prefer SVG format for images.
> +
> +    This function handles outputs image formats in depence of source the format
> +    of the image and the translator's output format. This also means to
> +    manipulate/update the *image* dictionary of the builder (``builder.images``)
> +
> +    """
> +    fname, in_ext = path.splitext(path.basename(img_node['uri']))
> +    src_fname     = path.join(translator.builder.srcdir, img_node['uri'])
> +    src_folder    = path.dirname(img_node['uri'])
> +    out_dir       = translator.builder.outdir
> +    dst_fname     = None
> +
> +    # in kernel builds, use 'make SPHINXOPTS=-v' to see verbose messages
> +    verbose = translator.builder.app.verbose
> +    warn    = translator.builder.warn
> +
> +    verbose('assert best format for: ' + img_node['uri'])
> +
> +    if in_ext == '.dot':
> +
> +        # ----------
> +        # handle DOT
> +        # ----------
> +
> +        dst_fname = path.join(out_dir, fname + '.pdf')
> +
> +        if translator.builder.format == 'html':
> +            dst_fname = path.join(out_dir, src_folder, fname + '.svg')
> +        else:
> +            # all other builder formats will include DOT as raw
> +            with open(src_fname, "r") as dot:
> +                data = dot.read()
> +                node = nodes.literal_block(data, data)
> +                img_node.replace_self(node)
> +
> +
> +    elif in_ext == '.svg':
> +
> +        # ----------
> +        # handle SVG
> +        # ----------
> +
> +        if translator.builder.format == 'latex':
> +            dst_fname = path.join(out_dir, fname + '.pdf')
> +
> +    if dst_fname:
> +        name = dst_fname[len(out_dir) + 1:]
> +        # the builder needs not to copy one more time, so pop it if exists.
> +        translator.builder.images.pop(img_node['uri'], None)
> +        img_node['uri'] = dst_fname
> +        img_node['candidates'] = {'*': dst_fname}
> +
> +        mkdir(path.dirname(dst_fname))
> +
> +        if in_ext == '.dot':
> +            verbose('convert DOT to: {out}/' + name)
> +            dot2format(src_fname, dst_fname)
> +
> +        elif in_ext == '.svg':
> +            verbose('convert SVG to: {out}/' + name)
> +            svg2pdf(src_fname, dst_fname)
> +
> +def dot2format(dot_fname, out_fname):
> +    """Converts DOT file to ``out_fname`` using ``dot(1)``.
> +
> +    * ``dot_fname`` pathname of the input DOT file, including extension ``.dot``
> +    * ``out_fname`` pathname of the output file, including format extension
> +
> +    The *format extension* depends on the ``dot`` command (see ``man dot``
> +    option ``-Txxx``). Normally you will use one of the following extensions:
> +
> +    - ``.ps`` for PostScript,
> +    - ``.svg`` or ``svgz`` for Structured Vector Graphics,
> +    - ``.fig`` for XFIG graphics and
> +    - ``.png`` or ``gif`` for common bitmap graphics.
> +
> +    """
> +    out_format = path.splitext(out_fname)[1][1:]
> +    cmd = ['dot', '-T%s' % out_format, dot_fname]
> +    exit_code = 42
> +    with open(out_fname, "w") as out:
> +        p = subprocess.Popen(
> +            cmd, stdout = out, stderr = subprocess.PIPE )
> +        nil, err = p.communicate()
> +
> +        sys.stderr.write(err)
> +
> +        exit_code = p.returncode
> +        out.flush()
> +    return bool(exit_code == 0)
> +
> +def svg2pdf(svg_fname, pdf_fname):
> +    """Converts SVG to PDF with CairoSVG or ``convert(1)`` command.
> +
> +    Uses ``convert(1)`` from ImageMagick (https://www.imagemagick.org) for
> +    conversion.  Returns ``True`` on success and ``False`` if an error occurred
> +    (e.g. none of the conversion tool is available).
> +
> +    * ``svg_fname`` pathname of the input SVG file with extension (``.svg``)
> +    * ``pdf_name``  pathname of the output PDF file with extension (``.pdf``)
> +
> +    """
> +    cmd = [convert_cmd, svg_fname, pdf_fname]
> +    p = subprocess.Popen(
> +        cmd, stdout = out, stderr = subprocess.PIPE )
> +    nil, err = p.communicate()
> +
> +    sys.stderr.write(err)
> +
> +    exit_code = p.returncode
> +    return bool(exit_code == 0)
> +
> +
> +# image handling
> +# ---------------------
> +
> +def visit_kernel_image(self, node):    # pylint: disable=W0613
> +    """Visitor of the ``kernel_image`` Node.
> +
> +    Handles the ``image`` child-node with the ``convert_image(...)``.
> +    """
> +    img_node = node[0]
> +    convert_image(img_node, self)
> +
> +class kernel_image(nodes.General, nodes.Element):
> +    """Node for ``kernel-image`` directive."""
> +    pass
> +
> +class KernelImage(images.Image):
> +    u"""KernelImage directive
> +
> +    Earns everything from ``.. image::`` directive, except *remote URI* and
> +    *glob* pattern. The KernelImage wraps a image node into a
> +    kernel_image node. See ``visit_kernel_image``.
> +    """
> +
> +    def run(self):
> +        env = self.state.document.settings.env
> +
> +        uri = self.arguments[0]
> +        if uri.endswith('.*') or uri.find('://') != -1:
> +            raise self.severe(
> +                'Error in "%s: %s": glob pattern and remote images are not allowed'
> +                % (self.name, uri))
> +
> +        # Tell sphinx of the dependency
> +        env.note_dependency(os.path.abspath(uri))
> +
> +        result = images.Image.run(self)
> +        if len(result) == 2 or isinstance(result[0], nodes.system_message):
> +            return result
> +        (image_node,) = result
> +        # wrap image node into a kernel_image node / see visitors
> +        node = kernel_image('', image_node)
> +        return [node]
> +
> +# figure handling
> +# ---------------------
> +
> +def visit_kernel_figure(self, node):   # pylint: disable=W0613
> +    """Visitor of the ``kernel_figure`` Node.
> +
> +    Handles the ``image`` child-node with the ``convert_image(...)``.
> +    """
> +    img_node = node[0][0]
> +    convert_image(img_node, self)
> +
> +class kernel_figure(nodes.General, nodes.Element):
> +    """Node for ``kernel-figure`` directive."""
> +
> +class KernelFigure(Figure):
> +    u"""KernelImage directive
> +
> +    Earns everything from ``.. figure::`` directive, except *remote URI* and
> +    *glob* pattern.  The KernelFigure wraps a figure node into a kernel_figure
> +    node. See ``visit_kernel_figure``.
> +    """
> +
> +    def run(self):
> +        env = self.state.document.settings.env
> +
> +        uri = self.arguments[0]
> +        if uri.endswith('.*') or uri.find('://') != -1:
> +            raise self.severe(
> +                'Error in "%s: %s":'
> +                ' glob pattern and remote images are not allowed'
> +                % (self.name, uri))
> +
> +        # Tell sphinx of the dependency
> +        env.note_dependency(os.path.abspath(uri))
> +
> +        result = Figure.run(self)
> +        if len(result) == 2 or isinstance(result[0], nodes.system_message):
> +            return result
> +        (figure_node,) = result
> +        # wrap figure node into a kernel_figure node / see visitors
> +        node = kernel_figure('', figure_node)
> +        return [node]
> +
> +
> +# render handling
> +# ---------------------
> +
> +def visit_kernel_render(self, node):
> +    """Visitor of the ``kernel_render`` Node.
> +
> +    If rendering tools available, save the markup of the ``literal_block`` child
> +    node into a file and replace the ``literal_block`` node with a new created
> +    ``image`` node, pointing to the saved markup file. Afterwards, handle the
> +    image child-node with the ``convert_image(...)``.
> +    """
> +
> +    verbose = self.builder.app.verbose
> +    warn    = self.builder.warn
> +    srclang = node.get('srclang')
> +
> +    verbose('visit kernel-render node lang: "%s"' % (srclang))
> +
> +    tmp_ext = RENDER_MARKUP_EXT.get(srclang, None)
> +    if tmp_ext is None:
> +        warn('kernel-render: "%s" unknow / include raw.' % (srclang))
> +        return
> +
> +    literal_block = node[0]
> +    code = literal_block.astext()
> +
> +    if tmp_ext:
> +        hashobj   = code.encode('utf-8') #  str(node.attributes)
> +        fname     = '%s-%s' % (srclang, sha1(hashobj).hexdigest())
> +        tmp_fname = path.join(
> +            self.builder.outdir, self.builder.imagedir, fname + tmp_ext)
> +
> +        if not path.isfile(tmp_fname):
> +            mkdir(path.dirname(tmp_fname))
> +            with open(tmp_fname, "w") as out:
> +                out.write(code)
> +
> +        image_node = nodes.image(node.rawsource, **node.attributes)
> +        image_node['uri'] = tmp_fname
> +
> +        literal_block.replace_self(image_node)
> +        convert_image(image_node, self)
> +
> +
> +class kernel_render(nodes.General, nodes.Inline, nodes.Element):
> +    """Node for ``kernel-render`` directive."""
> +    pass
> +
> +class KernelRender(Figure):
> +    u"""KernelRender directive
> +
> +    Render content by external tool.  Has all the options known from the
> +    *figure*  directive, plus option ``caption``.  If ``caption`` has a
> +    value, a figure node with the *caption* is inserted. If not, a image node is
> +    inserted.
> +
> +    The KernelRender directive wraps the text of the directive into a
> +    literal_block node and wraps it into a kernel_render node. See
> +    ``visit_kernel_render``.
> +    """
> +    has_content = True
> +    required_arguments = 1
> +    optional_arguments = 0
> +    final_argument_whitespace = False
> +
> +    # earn options from 'figure'
> +    option_spec = Figure.option_spec.copy()
> +    option_spec['caption'] = directives.unchanged
> +
> +    def run(self):
> +        return [self.build_node()]
> +
> +    def build_node(self):
> +
> +        srclang = self.arguments[0].strip()
> +        if srclang not in RENDER_MARKUP_EXT.keys():
> +            return [self.state_machine.reporter.warning(
> +                'Unknow source language "%s", use one of: %s.' % (
> +                    srclang, ",".join(RENDER_MARKUP_EXT.keys())),
> +                line=self.lineno)]
> +
> +        code = '\n'.join(self.content)
> +        if not code.strip():
> +            return [self.state_machine.reporter.warning(
> +                'Ignoring "%s" directive without content.' % (
> +                    self.name),
> +                line=self.lineno)]
> +
> +        node = kernel_render()
> +        node['alt'] = self.options.get('alt','')
> +        node['srclang'] = srclang
> +        literal_node = nodes.literal_block(code, code)
> +        node += literal_node
> +
> +        caption = self.options.get('caption')
> +        if caption:
> +            # parse cation's content
> +            parsed = nodes.Element()
> +            self.state.nested_parse(
> +                ViewList([caption], source=''), self.content_offset, parsed)
> +            caption_node = nodes.caption(
> +                parsed[0].rawsource, '', *parsed[0].children)
> +            caption_node.source = parsed[0].source
> +            caption_node.line = parsed[0].line
> +
> +            figure_node = nodes.figure('', node)
> +            for k,v in self.options.items():
> +                figure_node[k] = v
> +            figure_node += caption_node
> +
> +            node = figure_node
> +
> +        return node
> +
> -- 
> 2.11.0
> 
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