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A pandoc-filter for images

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``` 
                                          \\\///
                                         / _  _ \
                                       (| (.)(.) |)
                .--------------------.OOOo--()--oOOO.-------------------.
                |                                                       |
                |        ____                          _                |
                |       /  _/____ ___   ____ _ ____ _ (_)____   ___     |
                |       / / / __ `__ \ / __ `// __ `// // __ \ / _ \    |
                |     _/ / / / / / / // /_/ // /_/ // // / / //  __/    |
                |    /___//_/ /_/ /_/ \__,_/ \__, //_//_/ /_/ \___/     |
                |                           /____/                      |
                |                                                       |
                '-------------------.oooO-------------------------------'
                                     (   )   Oooo.
                                      \ (    (   )
                                       \_)    ) /
                                             (_/
```

## A pandoc filter to process codeblocks into images and/or ascii art

Imagine is a pandoc filter that will turn codeblocks tagged with certain
classes into images or ascii art. The following are currently supported:

actdiag, asy, asymptote, blockdiag, boxes, circo, ctioga2, ditaa, dot, fdp,
    figlet, flydraw, gle, gnuplot, graph, graphviz, gri, imagine, mermaid, mscgen,
    neato, nwdiag, octave, packetdiag, pic, pic2plot, plantuml, plot, ploticus,
    protocol, pyxplot, rackdiag, seqdiag, sfdp, shebang, twopi

## Examples

### [Mscgen](http://www.mcternan.me.uk/mscgen/)

![](https://raw.githubusercontent.com/hertogp/imagine/master/pd-images/3472ea8b47f0b7d2d2f30565851e320f39b5e3a9.png)

```{.mscgen im_out="img,fcb" im_fmt="png"}
    msc {
     hscale="1.3", arcgradient = "8";
    
     a [label="Client"],b [label="Server"];
    
     a=>b [label="data1"];
     a-xb [label="data2"];
     a=>b [label="data3"];
     a<=b [label="ack1, nack2"];
     a=>b [label="data2", arcskip="1"];
     |||;
     a<=b [label="ack3"];
     |||;
    }
    ```

### [Mermaid](https://github.com/mermaidjs/mermaid.cli)

![](https://raw.githubusercontent.com/hertogp/imagine/master/pd-images/cc321a3330d39327fcaffac5dc39397e6166edc7.png)

```{.mermaid im_opt="-H 300" im_fmt="png" im_out="img,fcb"}
    sequenceDiagram
        Alice ->> Bob: Hello Bob, how are you?
        Bob-->>John: How about you John?
        Bob--x Alice: I am good thanks!
        Bob-x John: I am good thanks!
        Note right of John: Bob thinks a long<br/>long time, so long<br/>that the text does<br/>not fit on a row.
    
        Bob-->Alice: Checking with John...
        Alice->John: Yes... John, how are you?
    ```

### [Gnuplot](http://www.gnuplot.info)

![](https://raw.githubusercontent.com/hertogp/imagine/master/pd-images/5f64cf6a4cf0b4b737fd2d07f0e3cc035475aca6.png)

```{.gnuplot im_fmt="png" im_out="img,fcb"}
    set terminal png
    set dummy u,v
    set key bmargin center horizontal Right noreverse enhanced autotitles nobox
    set parametric
    set view 50, 30, 1, 1
    set isosamples 50, 20
    set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
    set ticslevel 0
    set title "Interlocking Tori"
    set urange [ -3.14159 : 3.14159 ] noreverse nowriteback
    set vrange [ -3.14159 : 3.14159 ] noreverse nowriteback
    splot cos(u)+.5*cos(u)*cos(v),sin(u)+.5*sin(u)*cos(v),.5*sin(v) with lines,\
    1+cos(u)+.5*cos(u)*cos(v),.5*sin(v),sin(u)+.5*sin(u)*cos(v) with lines
    ```

### [Shebang](http://www.google.com/search?q=linux+shebang) using Python & Pygal

![](https://raw.githubusercontent.com/hertogp/imagine/master/pd-images/4d647b61c07fe8c3935def2b57796c0780ff38bd.png)

```{.shebang im_fmt="png" im_out="img,fcb"}
    #!/usr/bin/env python3
    import sys
    import pygal
    from math import cos
    xy_chart = pygal.XY()
    xy_chart.title = 'XY Cosinus'
    xy_chart.add('x = cos(y)', [(cos(x / 10.), x / 10.) for x in range(-50, 50, 5)])
    xy_chart.add('y = cos(x)', [(x / 10., cos(x / 10.)) for x in range(-50, 50, 5)])
    xy_chart.render_to_png(sys.argv[-1])
    ```

### [boxes](http://boxes.thomasjensen.com)

/*       _\|/_
             (o o)
     +----oOO-{_}-OOo------------------------------+
     |    #!/bin/bash                              |
     |    # I seem to have got myself boxed in!    |
     |    cat $0 | boxes -d peek -p h4             |
     +--------------------------------------------*/

```{.shebang im_out="stdout,fcb"}
    #!/bin/bash
    # I seem to have got myself boxed in!
    cat $0 | boxes -d peek -p h4
    ```

More examples on
[github](https://github.com/hertogp/imagine/tree/master/examples), which
also includes formats other than `png`.

## Documentation

Imagine
      A pandoc filter to turn fenced codeblocks into graphics or ascii art by
      wrapping some external command line utilities, such as:
    
        actdiag, asy, asymptote, blockdiag, boxes, circo, ctioga2, ditaa, dot,
        fdp, figlet, flydraw, gle, gnuplot, graph, graphviz, gri, imagine,
        mermaid, mscgen, neato, nwdiag, octave, packetdiag, pic, pic2plot,
        plantuml, plot, ploticus, protocol, pyxplot, rackdiag, seqdiag, sfdp,
        shebang, twopi
    
    
    Installation
    
        % sudo -H pip install pandoc-imagine
    
        or simply save `pandoc_imagine.py` anywhere along python's sys.path
    
    
    Dependencies
    
        % sudo -H pip install pandocfilters six
    
        and one (or more) of the packages that provide above utilities.
    
    
    Pandoc usage
    
        % pandoc --filter pandoc-imagine document.md -o document.pdf
    
    
    Markdown usage
    
        ```cmd
        code
        ```
    
      Alternate, longer form:
    
        ```{.cmd im_opt=".." ...}
        code
        ```
    
      which will run `cmd` (if known) to proces the `code` into an image and
      replaces the fenced code block with an Image in a paragraph of its own or any
      ascii art in its own CodeBlock.
    
      If the command fails, the original fenced code block is retained unchanged.
      Usually, only errors are printed to stderr but you can get more info by
      setting the `im_log` option (see below).
    
      If the command succeeds but produces no image, a line reporting the missing
      image is included in the output document.
    
    
    Imagine options
    
      Imagine's behaviour can be influenced by setting these options:
    
      - im_opt="" or any cli-options to pass in on the command line.
        Some classes already provide some defaults (as required by the command).
    
      - im_out="img", or ordered csv-list of keywords indicating what to produce:
        - img     an image-link in a paragraph
        - ocb     the original codeblock but without imagine's class or options
        - fcb     an anonymous codeblock containing the original codeblock
        - stdout  an anonymous codeblock containing captured stdout (if any)
        - stderr  an anonymous codeblock containing captured stderr (if any)
    
        Some workers ignore 'img' by necessity since they donot produce graphical
        data that can be linked to, e.g. `figlet` or `protocol`, while others the
        'stdout' will ignored because that's where they produce their graphical
        data.
    
      - im_prg=None, or a cli-cmd name to override class-to-command map.
        Normally, the class on the code block maps directly to a command line
        tool to use. For example,
        ```gri
        ..
        ```
        maps gri to `gri`, but that can be changed by `{.gri im_prg="gri2"} to use
        `gri2` instead of `gri`.
    
      - im_fmt="png", or another output format of your choosing depending on the
        command line tool used.  Some tools donot derive their output image format
        from an intended output file name extension, but instead require it to be
        set in the tool's codeblock containing its instructions.  Be sure the code
        in the codeblock matches `im_fmt` or pandoc may have trouble assembling the
        final document.
    
      - im_dir="pd", or antoher absolute or relative (to the working directory)
        path in which input/output files are to be stored during processing.
        Note that an "-images" is still tacked onto the end of the path though.
    
      - im_log=0, which defaults to printing only errors caught during processing.
        Set it to -1 to completely silence Imagine, or as high as 4 for debug level
        output if somethings goes wrong and you need more information on what is
        going on.
    
      Option values are resolved in order of most to least specific:
    
      1. {.klass im_xyz=".."}       codeblock specific
      2. imagine.klass.im_xyz: ..   metadata, klass specific
      3. imagine.im_xyz: ..         metadata, imagine specific
      4. class variable             hardcoded default
    
      Notes:
      - filenames are based on a hash of the codeblock + its attributes
      - uses subdir `{im_dir}-images` to store any input/output files
      - there's no clean up of files stored there
      - if an output filename exists, it is not regenerated but simply linked to.
      - `packetdiag`'s underlying library seems to have some problems.
    
      Some commands follow a slightly different pattern:
      - 'img' directive is ignored by commands that only produce ascii
      - ctioga2 defaults to pdf instead of png
      - flydraw produces a gif, not png
      - gle also creates a .gle subdir inside the images-dir
      - gri produces a ps, which is `convert`ed to png
      - imagine reads its code as help-topics, returns codeblocks with help-info
      - plot reads its codeblock as the relative path to the file to process
      - pyxplot will have `set terminal` & `set output` prepended to its `code`
      - shebang runs its codeblock as a script with <fname>.{im_fmt} as its argument.
        - use {.shebang im_out="stdout"} for text instead of an png
    
    
    Merge `Image`'s into a single `Para`.
    
      Based on a feature request (https://github.com/hertogp/imagine/issues/16) by
      pbsds (https://github.com/pbsds), `pandoc-imagine` has been extended to
      better cooperate with pandoc-crossref
      (https://github.com/lierdakil/pandoc-crossref#pandoc-crossref-filter-), whose
      subfigure grids (https://lierdakil.github.io/pandoc-crossref/#subfigure-grid)
      facility requires that consecutive image links be located inside a single
      paragraph.
    
      This means that 'Div's, when assigned the 'pandoc-imagine' specific class
      `im_merge`, will have their block-level elements processed individually.  Any
      consecutive `Image`-links are collected into a single `Para`, other elements
      are included in the `Div` contents as-is.
    
      See Examples/inline.md and Examples/inline.pdf.
    
    
    Security
    
      Imagine just hands the fenced codeblocks to plotting tools to process or
      simply runs them as system scripts, as-is.
    
      Shebang's are inherently unsafe and most of the plotting tools implement
      their own 'little' languages, which can create beautiful images, but can also
      cause harm.
    
      There is no way to check for 'side effects' in advance, so make sure to check
      the fenced codeblocks before running them through the filter.
    
    
    Imagine class
    
    The imagine class puts documentation of topics at your fingertips, like so:
    
        ```imagine
        klass
        ```
    
      Use `imagine` as klass to get the module's docstring (ie this text) and/or
      one or more of the commands you're interested in, each on a separate line.
    
    
    Thanks for feedback:
    
      amietn, chdemko, heyrict, priiduonu, K4zuki, pbsds

## Individual Classes

``` 
Asy

sudo-apt-get install asymptote

See http://asymptote.sourceforge.net/
    
    Runs asy -o <fname>.{im_fmt} {im_opt} <fname>.asy
    Wraps:
    -  'asy' -> asy
    -  'asymptote' -> asy

BlockDiag

sudo pip install blockdiag nwdiag actdiag seqdiag
    http://blockdiag.com/
    
    Runs {im_prg} {im_opt} -T {im_fmt} <fname>.{im_fmt} -o <fname>.{im_prg}
    Wraps:
    -  'blockdiag' -> blockdiag
    -  'seqdiag' -> seqdiag
    -  'rackdiag' -> rackdiag
    -  'nwdiag' -> nwdiag
    -  'packetdiag' -> packetdiag
    -  'actdiag' -> actdiag

Boxes

sudo apt-get install boxes
    http://boxes.thomasjensen.com
    
    Runs boxes {im_opt} <fname>.boxes
    Wraps:
    -  'boxes' -> boxes

Ctioga2

sudo apt-get install ctioga2
    http://ctioga2.sourceforge.net
    
    Runs ctioga2 {im_opt} -f <fname>.ctioga2
    Wraps:
    -  'ctioga2' -> ctioga2

Ditaa

sudo apt-get install ditaa
    http://ditaa.sourceforge.net
    
    Runs ditaa <fname>.ditaa <fname>.{im_fmt} {im_opt}
    Wraps:
    -  'ditaa' -> ditaa

Figlet

sudo apt-get install figlet
    http://www.figlet.org
    
    Runs figlet {im_opt} < code-text
    Wraps:
    -  'figlet' -> figlet

Flydraw

sudo apt-get install flydraw
    http://manpages.ubuntu.com/manpages/precise/man1/flydraw.1.html
    notes:
    - graphic data is printed to stdout
    - so 'stdout' in im_out option is silently ignored
    
    Runs flydraw {im_opt} < code-text
    Wraps:
    -  'flydraw' -> flydraw

Gle

sudo apt-get install gle-graphics
    http://glx.sourceforge.net
    
    Runs gle {im_opt} -verbosity 0 -output <fname>.{im_fmt} <fname>.gle
    Wraps:
    -  'gle' -> gle

GnuPlot

sudo apt-get install gnuplot
    http://www.gnuplot.info
    notes:
    - graphic data is printed to stdout
    - so 'stdout' in im_out option is silently ignored
    
    Runs gnuplot {im_opt} <fname>.gnuplot > <fname>.{im_fmt}
    Wraps:
    -  'gnuplot' -> gnuplot

Graph

sudo apt-get install plotutils
    https://www.gnu.org/software/plotutils
    notes:
    - graphic data is printed to stdout
    - so 'stdout' in im_out option is silently ignored
    
    Runs graph -T png {im_opt} <fname>.graph
    Wraps:
    -  'graph' -> graph

Graphviz

sudo apt-get install graphviz
    http://graphviz.org
    
    Runs {im_prg} {im_opt} -T{im_fmt} <fname>.{im_prg} <fname>.{im_fmt}
    Wraps:
    -  'dot' -> dot
    -  'neato' -> neato
    -  'twopi' -> twopi
    -  'circo' -> circo
    -  'fdp' -> fdp
    -  'sfdp' -> sfdp
    -  'graphviz' -> dot

Gri

sudo apt-get install gri imagemagick
    http://gri.sourceforge.net
    Notes
    - insists on creating a <fname>.ps in current working directory
    - requires `convert` from imagemagick
    - ImageMagick's security policy might need massaging
    
    Runs gri {im_opt} -c 0 -b <fname>.gri
    Wraps:
    -  'gri' -> gri

Imagine

pip install pandoc-imagine
    https://github.com/hertogp/imagine
    
    Runs returns documentation in a CodeBlock
    Wraps:
    -  'imagine' -> imagine

Mermaid

sudo npm install mermaid.cli
    https://github.com/mermaidjs/mermaid.cli
    
    Runs mmdc -i <fname>.mermaid -o <fname>.<fmt> {im_opt}
    Wraps:
    -  'mermaid' -> mmdc

MscGen

sudo apt-get install mscgen
    http://www.mcternan.me.uk/mscgen
    
    Runs mscgen -T {im_fmt} -o <fname>.{im_fmt} <fname>.mscgen
    Wraps:
    -  'mscgen' -> mscgen

Octave

sudo apt-get install octave
    https://www.gnu.org/software/octave
    
    Runs octage --no-gui -q {im_opt} <fname>.octave <fname>.{im_fmt}
    Wraps:
    -  'octave' -> octave

Pic2Plot

sudo apt-get install plotutils
    https://www.gnu.org/software/plotutils
    notes:
    - graphic data is printed to stdout
    - so 'stdout' in im_out option is silently ignored
    
    Runs pic2plot -T png {im_opt} <fname>.pic2plot
    Wraps:
    -  'pic2plot' -> pic2plot
    -  'pic' -> pic2plot

PlantUml

sudo apt-get install plantuml
    http://plantuml.com
    
    Runs plantuml -t{im_fmt} <fname>.plantuml {im_opt}
    Wraps:
    -  'plantuml' -> plantuml

Plot

sudo apt-get install plotutils
    https://www.gnu.org/software/plotutils
    notes:
    - graphic data is printed to stdout
    - so 'stdout' in im_out option is silently ignored
    
    Runs plot -T {im_fmt} {im_opt} <code-text-as-filename>
    Wraps:
    -  'plot' -> plot

Ploticus

sudo apt-get install ploticus
    http://ploticus.sourceforge.net/doc/welcome.html
    
    Runs ploticus -{im_fmt} -o <fname>.{im_fmt} {im_opt} <fname>.ploticus
    Wraps:
    -  'ploticus' -> ploticus

Protocol

cd ~/installs/git-repos
    git clone https://github.com/luismartingarcia/protocol.git
    python setup install
    https://github.com/luismartingarcia/protocol.git
    
    Runs protocol {im_opt} code-text
    Wraps:
    -  'protocol' -> protocol

PyxPlot

sudo apt-get install pyxplot
    http://pyxplot.org.uk
    
    Runs pyxplot {im_opt} <fname>.pyxplot
    Wraps:
    -  'pyxplot' -> pyxplot

SheBang

http://www.google.com/search?q=shebang+line
    
    Runs <fname>.shebang {im_opt} <fname>.{im_fmt}
    Wraps:
    -  'shebang' -> shebang

```

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