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Add MarkdownOptionsHandlerFunc in a separate experimental package.
It allows enabling automatic Table of Contents widget, which is experimentally provided via a blank import of a handler. Many issues to resolve and need to continue to look for a good solution. But this works for now and is needed for Conception-go to compile as is.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package u10 | ||
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|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "time" | ||
|
|
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| "github.com/shurcooL/go/github_flavored_markdown" | ||
| "github.com/shurcooL/go/u/u1" | ||
|
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| // An experiment in making the frontend resources available. | ||
| // This tries to ensure "/table-of-contents.go.js" and "/table-of-contents.css" will be available... | ||
| // TODO: This is not quite done and requires figuring out a good way to solve the challenge... | ||
| // Relative paths do not work at all when it's a library rather than package main. | ||
| // TODO: Perhaps the strings `<script type="text/javascript" src="/table-of-contents.go.js"></script>` and | ||
| // `<link href="/table-of-contents.css" media="all" rel="stylesheet" type="text/css" />` should be coming | ||
| // from the TOC handler package? | ||
| // TODO: Perhaps I could use "/go/import/path" notation to ensure no path collisions? | ||
| _ "github.com/shurcooL/frontend/table-of-contents/handler" | ||
| ) | ||
|
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| type Options struct { | ||
| TableOfContents bool | ||
| } | ||
|
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| // MarkdownOptionsHandlerFunc is an http.Handler that serves rendered Markdown. | ||
| type MarkdownOptionsHandlerFunc func(req *http.Request) (markdown []byte, opt *Options, err error) | ||
|
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| func (this MarkdownOptionsHandlerFunc) ServeHTTP(w http.ResponseWriter, req *http.Request) { | ||
| markdown, opt, err := this(req) | ||
| if err != nil { | ||
| http.Error(w, err.Error(), 500) | ||
| return | ||
| } | ||
|
|
||
| if opt == nil { | ||
| opt = &Options{} | ||
| } | ||
|
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| if _, plain := req.URL.Query()["plain"]; plain { | ||
| w.Header().Set("Content-Type", "text/plain") | ||
| w.Write(markdown) | ||
| } else if _, github := req.URL.Query()["github"]; github { | ||
| w.Header().Set("Content-Type", "text/html") | ||
| started := time.Now() | ||
| switch opt.TableOfContents { | ||
| case false: | ||
| u1.WriteGitHubFlavoredMarkdownViaGitHub(w, markdown) | ||
| case true: | ||
| http.Error(w, "not implemented", 500) | ||
| panic("not implemented") | ||
| } | ||
| fmt.Println("rendered GFM via GitHub, took", time.Since(started)) | ||
| } else { | ||
| w.Header().Set("Content-Type", "text/html") | ||
| started := time.Now() | ||
| switch opt.TableOfContents { | ||
| case false: | ||
| u1.WriteGitHubFlavoredMarkdownViaLocal(w, markdown) | ||
| case true: | ||
| writeGitHubFlavoredMarkdownViaLocalWithToc(w, markdown) | ||
| } | ||
| fmt.Println("rendered GFM locally, took", time.Since(started)) | ||
| } | ||
| } | ||
|
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| // writeGitHubFlavoredMarkdownViaLocalWithToc renders GFM as a full HTML page with table of contents and writes to w. | ||
| func writeGitHubFlavoredMarkdownViaLocalWithToc(w io.Writer, markdown []byte) { | ||
| io.WriteString(w, `<html><head><meta charset="utf-8"><link href="https://dl.dropboxusercontent.com/u/8554242/temp/github-flavored-markdown.css" media="all" rel="stylesheet" type="text/css" /><link href="//cdnjs.cloudflare.com/ajax/libs/octicons/2.1.2/octicons.css" media="all" rel="stylesheet" type="text/css" /><link href="/table-of-contents.css" media="all" rel="stylesheet" type="text/css" /></head><body><article class="markdown-body entry-content" style="padding: 30px;">`) | ||
| w.Write(github_flavored_markdown.Markdown(markdown)) | ||
| io.WriteString(w, `</article><script type="text/javascript" src="/table-of-contents.go.js"></script></body></html>`) | ||
| } |