sbt-site supports basic variable substitution via the
PreprocessPlugin if for example you need to replace a version string in a source file or a generated HTML file. More advanced preprocessing, such as interpreting code snippets with tut, is possible via additional configuration as shown below.
PreprocessPlugin reads files from an input directory, substitute variables and writes them to an output directory. In addition to preprocessing static content it is also possible to use the plugin either before or after invoking a site generator. To enable, add this to your
By default files are read from
src/site-preprocess but this is configurable by setting
sourceDirectory in Preprocess := sourceDirectory.value / "site-preprocess"
Variables are delimited by surrounding the name with
@ symbols (e.g.
@[email protected]). Values are assigned to variables via the setting
preprocessVars: [Map[String, String]]. For example:
preprocessVars in Preprocess := Map("VERSION" -> version.value, "DATE" -> new Date().toString)
The plugin will generate an error if a variable is found in the source file with no matching value in
preprocessIncludeFilter is used to define the filename extensions that should be processed when
makeSite is run.
preprocessIncludeFilter := "*.md" | "*.markdown"
The default filter is:
"*.txt" | "*.html" | "*.md" | "*.rst"
The tut sbt plugin allows you to write documentation with fenced code blocks that is typechecked and run as part of your build. For example this markdown snippet:
Here is how you add numbers: ```tut 1 + 1 ```
Will show the result of running the code in the Scala REPL:
Here is how you add numbers: ```scala scala> 1 + 1 res0: Int = 2 ```
The following example shows how to use it to preprocess a collection of markdown files before running a site generator.
enablePlugins(ParadoxSitePlugin, TutPlugin) sourceDirectory in Paradox := tutTargetDirectory.value makeSite := makeSite.dependsOn(tut).value
The example uses the Paradox site generator but can be adapted to any site generator which understands markdown by configuring its
sourceDirectory accordingly. For Jekyll, this would be:
sourceDirectory in Jekyll := tutTargetDirectory.value