Redmine Wiki External Filter Plugin
===================================
Copyright (C) 2010 Alexander Tsvyashchenko,
http://www.ndl.kiev.ua - see COPYRIGHT.txt
This plugin allows defining macros that process macro argument using external filter program and render its result in Redmine wiki.
For every filter two macros are defined: <macro> and <macro>_include. The first one directly processes its argument using filter, while the second one assumes its argument is wiki page name, so it reads that wiki page content and processes it using the filter.
Macros already bundled with current release are listed below, but adding new ones is typically as easy as adding several lines in plugin config file.
It's recommended (but not required) to install popen4 library first as without it plugin is unable to capture stderr output of external command, so it might be hard to debug it if things go wrong.
Get sources from github.
See Installing a plugin on Redmine site.
Copy wiki_external_filter.yml from config folder of plugin directory to the config folder of your redmine installation.
After installation it's strongly recommended to go to plugin settings and configure caching: Administration -> Plugins -> Wiki External Filter Plugin: Configure and follow instructions. Note that RoR file-based caching suggested by default does not implement proper cache expiration: you should either setup a cron task to clean cache or do it manually from time to time.
To successfully use macros with argument expressions, it's necessary to patch wiki formatting routine so that it preserves macros arguments.
Redmine 1.0.2: apply this patch to the Redmine core and go to step 7, there's no need to patch individual wiki formatters anymore.
Redmine 0.9.x: if you use Markdown Extra, switch to the following fork of redmine_markdown_extra_formatter that contains all necessary changes. This patch is for older Markdown Extra formatter version and should not be used for new installations.
Note: if you install Markdown Extra formatter - you should enable it in Administration -> Settings -> General -> Text formatting.
If you use wiki formatter other than Markdown Extra (including default Textile formatter) you will have to change your wiki formatter yourselves as follows:
Preliminary version of patch for Textile support was made available by Yuya Nishihara, according to the author "It works but really messy" but I haven't tested it so cannot comment on it.
To allow passing attachments names as macros arguments Redmine core should be patched accordingly: here's the patch for Redmine 1.0.2 and here is the patch for Redmine 0.9.x.
Specific filters installation instructions are below.
PlantUML is a tool to render UML diagrams from their textual representation. It's assumed that it can be invoked via wrapper /usr/bin/plantuml, here's its example content:
#!/bin/bash
/usr/bin/java -Djava.io.tmpdir=/var/tmp -jar /usr/share/plantuml/lib/plantuml.jar ${@}
Result is rendered as PNG file. SVG support seems to be under development for PlantUML but so far looks like it's still unusable.
Gentoo ebuild is attached.
Example of usage:
{{plantuml(
Alice -> Bob: Authentication Request
alt successful case
Bob -> Alice: Authentication Accepted
else some kind of failure
Bob -> Alice: Authentication Failure
opt
loop 1000 times
Alice -> Bob: DNS Attack
end
end
else Another type of failure
Bob -> Alice: Please repeat
end
)}}
Rendered output:
Graphviz is a tool for graph-like structures visualization. It's assumed that it can be called as /usr/bin/dot.
Result is rendered as SVG image or PNG fallback if SVG is not supported by your browser.
Example of usage:
{{graphviz(
digraph finite_state_machine {
rankdir=LR;
size="8,5"
node [shape = doublecircle]; LR_0 LR_3 LR_4 LR_8;
node [shape = circle];
LR_0 -> LR_2 [ label = "SS(B)" ];
LR_0 -> LR_1 [ label = "SS(S)" ];
LR_1 -> LR_3 [ label = "S($end)" ];
LR_2 -> LR_6 [ label = "SS(b)" ];
LR_2 -> LR_5 [ label = "SS(a)" ];
LR_2 -> LR_4 [ label = "S(A)" ];
LR_5 -> LR_7 [ label = "S(b)" ];
LR_5 -> LR_5 [ label = "S(a)" ];
LR_6 -> LR_6 [ label = "S(b)" ];
LR_6 -> LR_5 [ label = "S(a)" ];
LR_7 -> LR_8 [ label = "S(b)" ];
LR_7 -> LR_5 [ label = "S(a)" ];
LR_8 -> LR_6 [ label = "S(b)" ];
LR_8 -> LR_5 [ label = "S(a)" ];
}
)}}
Rendered output:
Combination of Ritex: a Ruby WebTeX to MathML converter and SVGMath that takes WebTeX formula specification as input and produces SVG file as output.
Both ritex and SVGMath require some patches/wrappers.
Additionally working installation of xmllint from libxml2 with configured MathML catalog is required: for Gentoo use this ebuild.
Gentoo ebuilds for ritex and svgmath are attached.
Example of usage:
{{ritex(
G(y) = \left\{\array{ 1 - e^{-\lambda x} & \text{ if } y \geq 0 \\ 0 & \text{ if } y < 0 }\right.
)}}
Rendered output:
These macros use ffmpeg to convert any supported video file to FLV format and display it on wiki using FlowPlayer flash player. video macro takes file path on server as its input, as well as attachments names from current wiki page, while video_url expects full URL to the video to convert & show.
Splash images for videos are generated automatically from the first frame of the video.
Multiple videos per page are supported, player instance is attached to the selected video as in this example.
Required packages installed:
Example of usage:
{{video(video_attachment_name.avi)}}
or
{{video(/full/path/to/the/file/on/the/server/video.avi)}}
or
{{video_url(http://www.example.com/video.avi)}}
Rendered output (before player is embedded by clicking on the image, using Flowplayer video demo file):
Fortune is a simple program that displays a random message from a database of quotations.
Not strictly a filter on its own (as it does not require any input), but it plays nice with external filtering approach and is fun to use, hence it's here ;-)
Example of usage:
{{fortune}}
Rendered output:
New macros can easily be added via wiki_external_filter.yml config file.
Every macro may have multiple commands processing the same input - for example for video macro two commands are used: first one extracts thumbnail and second one converts the video.
Commands use standard Unix approach for filtering: input is fed
to the command via stdin and output is read on stdout. If command return
status is zero, content type is assumed to be of content_type
specified in
config, otherwise it's assumed to be plain error text together with stderr content.
You can use prolog
/epilog
config parameters to add standard text before/after
actual macro content passed to filter.
Additionally, cache_seconds
parameter specifies the number of seconds commands
output result should be cached, use zero to disable caching for this macro.
The way filter output is visualized is controlled via
app/views/wiki_externalfilter/macro*.html.erb files. The view to use is selected by template
macro option in config. The view can use all commands outputs for particular macro.
replace_attachments
tells plugin that it should parse the text passed to the macro and replace all occurrences of strings matching attachments names with their physical paths on disk.
Macro argument is de-escaped via CGI.unescapeHTML call prior to being fed to filter.