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post.rb
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post.rb
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module Jekyll
class Post
include Comparable
include Convertible
include URL
class << self
attr_accessor :lsi
end
# Valid post name regex.
MATCHER = /^(.+\/)*(\d+-\d+-\d+)-(.*)(\.[^.]+)$/
# Post name validator. Post filenames must be like:
# 2008-11-05-my-awesome-post.textile
#
# Returns true if valid, false if not.
def self.valid?(name)
name =~ MATCHER
end
attr_accessor :site
attr_accessor :data, :excerpt, :content, :output, :ext
attr_accessor :date, :slug, :published, :tags, :categories
attr_reader :name
# Initialize this Post instance.
#
# site - The Site.
# base - The String path to the dir containing the post file.
# name - The String filename of the post file.
#
# Returns the new Post.
def initialize(site, source, dir, name)
@site = site
@base = self.containing_dir(source, dir)
@name = name
self.categories = dir.downcase.split('/').reject { |x| x.empty? }
self.process(name)
begin
self.read_yaml(@base, name)
rescue Exception => msg
raise FatalException.new("#{msg} in #{@base}/#{name}")
end
# If we've added a date and time to the YAML, use that instead of the
# filename date. Means we'll sort correctly.
if self.data.has_key?('date')
# ensure Time via to_s and reparse
self.date = Time.parse(self.data["date"].to_s)
end
if self.data.has_key?('published') && self.data['published'] == false
self.published = false
else
self.published = true
end
self.tags = self.data.pluralized_array("tag", "tags")
if self.categories.empty?
self.categories = self.data.pluralized_array('category', 'categories').map {|c| c.downcase}
end
self.tags.flatten!
self.categories.flatten!
end
# Get the full path to the directory containing the post files
def containing_dir(source, dir)
return File.join(source, dir, '_posts')
end
# Read the YAML frontmatter.
#
# base - The String path to the dir containing the file.
# name - The String filename of the file.
#
# Returns nothing.
def read_yaml(base, name)
super(base, name)
self.excerpt = self.extract_excerpt
self.data['layout'] = 'post' unless self.data.has_key?('layout')
end
# Compares Post objects. First compares the Post date. If the dates are
# equal, it compares the Post slugs.
#
# other - The other Post we are comparing to.
#
# Returns -1, 0, 1
def <=>(other)
cmp = self.date <=> other.date
if 0 == cmp
cmp = self.slug <=> other.slug
end
return cmp
end
# Extract information from the post filename.
#
# name - The String filename of the post file.
#
# Returns nothing.
def process(name)
m, cats, date, slug, ext = *name.match(MATCHER)
self.date = Time.parse(date)
self.slug = slug
self.ext = ext
rescue ArgumentError
raise FatalException.new("Post #{name} does not have a valid date.")
end
# Transform the contents and excerpt based on the content type.
#
# Returns nothing.
def transform
super
self.excerpt = converter.convert(self.excerpt)
end
# The generated directory into which the post will be placed
# upon generation. This is derived from the permalink or, if
# permalink is absent, set to the default date
# e.g. "/2008/11/05/" if the permalink style is :date, otherwise nothing.
#
# Returns the String directory.
def dir
File.dirname(url)
end
# The full path and filename of the post. Defined in the YAML of the post
# body (optional).
#
# Returns the String permalink.
def permalink
self.data && self.data['permalink']
end
def template
case self.site.permalink_style
when :pretty
"/:categories/:year/:month/:day/:title/"
when :none
"/:categories/:title.html"
when :date
"/:categories/:year/:month/:day/:title.html"
when :ordinal
"/:categories/:year/:y_day/:title.html"
else
self.site.permalink_style.to_s
end
end
# See url.rb for an explanation
def url_placeholders
{
"year" => date.strftime("%Y"),
"month" => date.strftime("%m"),
"day" => date.strftime("%d"),
"title" => CGI.escape(slug),
"i_day" => date.strftime("%d").to_i.to_s,
"i_month" => date.strftime("%m").to_i.to_s,
"categories" => categories.map { |c| URI.escape(c.to_s) }.join('/'),
"short_month" => date.strftime("%b"),
"y_day" => date.strftime("%j"),
"output_ext" => self.output_ext
}
end
# The UID for this post (useful in feeds).
# e.g. /2008/11/05/my-awesome-post
#
# Returns the String UID.
def id
File.join(self.dir, self.slug)
end
# Calculate related posts.
#
# Returns an Array of related Posts.
def related_posts(posts)
return [] unless posts.size > 1
if self.site.lsi
self.class.lsi ||= begin
puts "Starting the classifier..."
lsi = Classifier::LSI.new(:auto_rebuild => false)
$stdout.print(" Populating LSI... ");$stdout.flush
posts.each { |x| $stdout.print(".");$stdout.flush;lsi.add_item(x) }
$stdout.print("\n Rebuilding LSI index... ")
lsi.build_index
puts ""
lsi
end
related = self.class.lsi.find_related(self.content, 11)
related - [self]
else
(posts - [self])[0..9]
end
end
# Add any necessary layouts to this post.
#
# layouts - A Hash of {"name" => "layout"}.
# site_payload - The site payload hash.
#
# Returns nothing.
def render(layouts, site_payload)
# construct payload
payload = {
"site" => { "related_posts" => related_posts(site_payload["site"]["posts"]) },
"page" => self.to_liquid
}.deep_merge(site_payload)
do_layout(payload, layouts)
end
# Obtain destination path.
#
# dest - The String path to the destination dir.
#
# Returns destination file path String.
def destination(dest)
# The url needs to be unescaped in order to preserve the correct filename
path = File.join(dest, CGI.unescape(self.url))
path = File.join(path, "index.html") if template[/\.html$/].nil?
path
end
# Write the generated post file to the destination directory.
#
# dest - The String path to the destination dir.
#
# Returns nothing.
def write(dest)
path = destination(dest)
FileUtils.mkdir_p(File.dirname(path))
File.open(path, 'w') do |f|
f.write(self.output)
end
end
# Convert this post into a Hash for use in Liquid templates.
#
# Returns the representative Hash.
def to_liquid
self.data.deep_merge({
"title" => self.data["title"] || self.slug.split('-').select {|w| w.capitalize! || w }.join(' '),
"url" => self.url,
"date" => self.date,
"id" => self.id,
"categories" => self.categories,
"next" => self.next,
"previous" => self.previous,
"tags" => self.tags,
"content" => self.content,
"excerpt" => self.excerpt })
end
# Returns the shorthand String identifier of this Post.
def inspect
"<Post: #{self.id}>"
end
def next
pos = self.site.posts.index(self)
if pos && pos < self.site.posts.length-1
self.site.posts[pos+1]
else
nil
end
end
def previous
pos = self.site.posts.index(self)
if pos && pos > 0
self.site.posts[pos-1]
else
nil
end
end
protected
# Internal: Extract excerpt from the content
#
# By default excerpt is your first paragraph of a post: everything before
# the first two new lines:
#
# ---
# title: Example
# ---
#
# First paragraph with [link][1].
#
# Second paragraph.
#
# [1]: http://example.com/
#
# This is fairly good option for Markdown and Textile files. But might cause
# problems for HTML posts (which is quite unusual for Jekyll). If default
# excerpt delimiter is not good for you, you might want to set your own via
# configuration option `excerpt_separator`. For example, following is a good
# alternative for HTML posts:
#
# # file: _config.yml
# excerpt_separator: "<!-- more -->"
#
# Notice that all markdown-style link references will be appended to the
# excerpt. So the example post above will have this excerpt source:
#
# First paragraph with [link][1].
#
# [1]: http://example.com/
#
# Excerpts are rendered same time as content is rendered.
#
# Returns excerpt String
def extract_excerpt
separator = self.site.config['excerpt_separator']
head, _, tail = self.content.partition(separator)
"" << head << "\n\n" << tail.scan(/^\[[^\]]+\]:.+$/).join("\n")
end
end
end