57 lines
1.9 KiB
Scheme
57 lines
1.9 KiB
Scheme
#lang plai/web
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;; A blog is a (listof post)
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;; and a post is a (make-post title body)
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;;
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(define-struct post (title body))
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;; BLOG: blog
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;; The static blog.
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(define BLOG (list (make-post "First Post" "This is my first post")
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(make-post "Second Post" "This is another post")))
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;; start: request -> html-response
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;; Consumes a request and produces a page that displays all of the web content.
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(define (start request)
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(render-blog-page BLOG request))
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;; parse-post: bindings -> post
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;; Extracts a post out of the bindings.
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(define (parse-post bindings)
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(make-post (extract-binding/single 'title bindings)
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(extract-binding/single 'body bindings)))
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;; render-blog-page: blog request -> html-response
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;; Consumes a blog and a request, and produces an html-response page of the content of the
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;; blog.
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(define (render-blog-page a-blog request)
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(local [(define (response-generator make-url)
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`(html (head (title "My Blog"))
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(body
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(h1 "My Blog")
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,(render-posts a-blog)
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(form ((action ,(make-url insert-post-handler)))
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(input ((name "title")))
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(input ((name "body")))
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(input ((type "submit")))))))
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(define (insert-post-handler request)
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(render-blog-page (cons (parse-post (request-bindings request))
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a-blog)
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request))]
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(send/suspend/dispatch response-generator)))
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;; render-post: post -> html-response
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;; Consumes a post, produces an html-response fragment of the post.
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(define (render-post a-post)
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`(div ((class "post"))
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,(post-title a-post)
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(p ,(post-body a-post))))
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;; render-posts: blog -> html-response
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;; Consumes a blog, produces an html-response fragment of all its posts.
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(define (render-posts a-blog)
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`(div ((class "posts"))
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,@(map render-post a-blog)))
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