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modified generated HTML files by downloading CDN-loaded assets #105

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modified generated HTML files by downloading CDN-loaded assets #105

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45 changes: 45 additions & 0 deletions build.fsx
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@

#load "fsreveal.fsx"

open System.Text.RegularExpressions

// Git configuration (used for publishing documentation in gh-pages branch)
// The profile where the project is posted
let gitOwner = "myGitUser"
Expand Down Expand Up @@ -57,6 +59,45 @@ let copyPics() =
with
| exn -> traceImportant <| sprintf "Could not copy picture: %s" exn.Message

let downloadAssets file =
let download (url:string) (filename:string) =
let content = (new System.Net.WebClient()).DownloadString(url)
File.WriteAllText((outDir </> filename), content)

let matchDownloadAndModifyAsset input tag attr subdir =
let regex = sprintf @"^(.*<%s.*%s\s*=\s*"")(//[^""]+?)(\?[^""]+?)?("".*)$" tag attr
let m = Regex.Match(input, regex)
if (m.Success)
then
let filePath = subdir </> Path.GetFileName(m.Groups.[2].Value)
let url = "http:" + m.Groups.[2].Value + m.Groups.[3].Value

download url filePath

Some (m.Groups.[1].Value + filePath + m.Groups.[4].Value)
else
None

let (|ScriptTag|_|) input =
matchDownloadAndModifyAsset input "script" "src" "js"

let (|LinkTag|_|) input =
matchDownloadAndModifyAsset input "link" "href" "css"

let downloadAssetIfNeeded line =
match line with
| ScriptTag l -> l
| LinkTag l -> l
| _ -> line

let oldFile = file + ".old"
File.Move(file, oldFile)

use stream = new StreamWriter(file);
File.ReadLines oldFile
|> Seq.map downloadAssetIfNeeded
|> Seq.iter stream.WriteLine

let generateFor (file:FileInfo) =
try
copyPics()
Expand All @@ -71,6 +112,10 @@ let generateFor (file:FileInfo) =

tryGenerate 3

let outFile = outDir </> (System.IO.Path.ChangeExtension(file.Name, "html"))
trace <| sprintf "Created '%s', downloading CDN-loaded assets..." outFile
downloadAssets outFile

copyStylesheet()
with
| :? FileNotFoundException as exn ->
Expand Down