obelisk

defmodule Obelisk.Document do

  def compile(md_file, template) do
    md = File.read! md_file
    { frontmatter, md_content } =  parts md
    fm = Obelisk.FrontMatter.parse frontmatter
    File.write(html_filename(md_file),
      EEx.eval_string(Obelisk.Layout.layout, assigns: [js: Obelisk.Assets.js, css: Obelisk.Assets.css, content: EEx.eval_string(template, assigns: [content: Earmark.to_html(md_content), frontmatter: fm])]))
  end

  def prepare(md_file, template) do
    md = File.read! md_file
    { frontmatter, md_content } =  parts md
    fm = Obelisk.FrontMatter.parse frontmatter
    content = EEx.eval_string(template, assigns: [ content: Earmark.to_html(md_content), frontmatter: fm, filename: file_name(md_file) ])
    assigns = [ js:       Obelisk.Assets.js,
                css:      Obelisk.Assets.css,
                content:  content
              ]
    document = EEx.eval_string(Obelisk.Layout.layout, assigns: assigns)
    %{ frontmatter: fm, content: content, document: document, path: html_filename(md_file), filename: file_name(md_file)  }
  end

  def write_all(pages) do
    Enum.each pages, fn page ->
      File.write page.path, page.document
    end
  end

  def file_name(md) do
    filepart = String.split("#{md}", "/") |> Enum.reverse |> hd
    String.replace(filepart, ".markdown", ".html")
  end

  def html_filename(md) do
    "./build/#{file_name(md)}"
  end

  def title(md) do
    String.capitalize(String.replace(String.replace(String.slice(md, 11, 1000), "-", " "), ".markdown", ""))
  end

  def parts(page_content) do
    [frontmatter|content] = String.split page_content, "\n---\n"
    { frontmatter, Enum.join(content, "\n") }
  end

  def create(title) do
    File.write(filename_from_title(title), Obelisk.Templates.post(title))
  end

  def filename_from_title(title) do
    datepart = Chronos.today |> Chronos.Formatter.strftime("%Y-%0m-%0d")
    titlepart = String.downcase(title) |> String.replace(" ", "-")
    "./posts/#{datepart}-#{titlepart}.markdown"
  end

end