--[[

We perform the actual check for whether this is a preview here since

preprocessing is relatively expensive.

]]

local frame = mw.getCurrentFrame()



local function is_preview()

	local revision_id = frame:preprocess('{{REVISIONID}}')

	-- {{REVISIONID}} is usually the empty string when previewed.

	-- I don't know why we're checking for nil but hey, maybe someday things

	-- would have broken

	return revision_id == nil or revision_id == ''

end



local function templatestyles()

	return frame:extensionTag{

		name = 'templatestyles', args = { src = 'Module:If preview/styles.css' }

	}

end



return {

	preview = is_preview(),

	templatestyles = templatestyles(),

	warning_infrastructure = '%s<div class="preview-warning"><strong>Preview warning:</strong> %s</div>',

	missing_warning = 'The template has no warning text. Please add a warning.'

}