The `postsparkline` directive is supplied by the [[!iki plugins/postsparkline desc=postsparkline]] plugin.

This directive uses the [[!iki plugins/sparkline desc=sparkline]] plugin to create a
[[sparkline]] of statistics about a set of pages, such as posts to a blog.

# examples

	Post interval: 
	\[[!postsparkline pages="blog/* and !*/Discussion" max=100
	formula=interval style=bar barwidth=2 barspacing=1 height=13]]
	
	Posts per month this year: 
	\[[!postsparkline pages="blog/* and !*/Discussion" max=12
	formula=permonth style=bar barwidth=2 barspacing=1 height=13]]

# usage

All options aside fron the `pages`, `max`, `formula`, `time`, and `color`
options are the same as in [[sparkline]] directive.

You don't need to specify any data points (though you can if you want to).
Instead, data points are automatically generated based on the creation
times of pages matched by the specified `pages` [[ikiwiki/PageSpec]]. A
maximum of `max` data points will be generated.

The `formula` parameter controls the formula used to generate data points.
Available forumlae:

* `interval` - The height of each point represents how long it has been
  since the previous post.
* `perday` - Each point represents a day; the height represents how
  many posts were made that day.
* `permonth` - Each point represents a month; the height represents how
  many posts were made that month.
* `peryear` - Each point represents a day; the height represents how
  many posts were made that year.

The `time` parameter has a default value of "ctime", since forumae use
the creation times of pages by default. If you instead want
them to use the modification times of pages, set it to "mtime".

To change the color used to draw the sparkline, use the `color` parameter.
For example, "color=red".

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