Hakyll说“检测到依赖性周期:...". [英] Hakyll says "Dependency cycle detected: ..."

问题描述

我正在尝试构建一个包含7页的网站.每个页面都是使用.markdown输入定义的.在每个页面上，我都希望有一个带有所有其他页面链接的标题.

I'm trying to construct a site with 7 pages. Each page is defined using a .markdown input. On each page I want a header with links to all the other pages.

现在，这似乎是不可能的，因为Hakyll告诉我我有递归依赖项.

Now, this seems to be impossible since Hakyll tells me that I have a recursive dependency.

[ERROR] Hakyll.Core.Runtime.chase: Dependency cycle detected: posts/page1.markdown depends on posts/page1.markdown

我已经确定了对该代码段的递归依赖性.

I have identified the recursive dependency to this snippet.

match "posts/*" $ do
    route $ setExtension "html"
    compile $ do
        posts <- loadAll "posts/*"
        let indexCtx =
                listField "posts" postCtx (return posts) `mappend`
                constField "title" "Home"                `mappend`
                defaultContext

        pandocCompiler >>= loadAndApplyTemplate "templates/post.html" indexCtx
              >>= loadAndApplyTemplate "templates/default.html" indexCtx
              >>= relativizeUrls

我想问题是我不允许在加载模板的模板上进行匹配.

I guess the problem is that I'm not allowed to match on the same template that a do a load on.

因此，如何在生成帖子时使用所有要使用的帖子的listField构造上下文.

So how can I construct a context with a listField for all posts to be used when generating posts.

我想一种替代方法是先生成链接，以某种方式存储它们，然后将其包含在帖子中.但是我该怎么办?

I guess an alternative would be to generate the links first, store them somehow and then include them in the posts. But how would I do that?

推荐答案

通过调用loadAll "posts/*"，您可以在编译当前帖子之前加载所有已完全编译的帖子，因此这是周期依赖性.

By calling loadAll "posts/*" you load every fully compiled post before compile the current one, so it's a cycle dependency.

最直接的解决方案是定义帖子的另一个版本:

The most straightforward solution is to define another version of your posts:

match "posts/*" $ version "titleLine" $ do
  -- route
  -- compiler, maybe generate a link to real page here from file path

然后，您可以加载它们而无需触发周期依赖性:

Then you can load them all without triggering a cycle dependency:

match "posts/*" $ do
  -- route
  compile $ do
    postList <- loadAll ("posts/*" .&&. hasVersion "titleLine")
    -- render the page

但是在所有不同的版本都是具有不同URL的不同页面之后，您可能必须从文件路径手动生成正确的URL.如果为多个页面设置相同的路由，则最后编译的页面将覆盖所有其他页面.

But you may have to manually generate the correct url from file path, after all a different version is a different page with different url. If you set the same routing for more than one page, the last one compiled will overwrite all the others.

您的情况还可以，因为未标记的版本取决于"titleLine"版本，因此稍后进行编译，但是对于不具有这种依赖性的version标记的页面始终进行编译，通常对于不同的页面具有相同的路由是很危险的以后.

It's OK in your case since the non-tagged version depends on the "titleLine" version so is compiled later, but generally it's dangerous to have same routing for different pages, without such a dependency version tagged page is always compiled later.

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