chore: Significantly restructure folder layout

This moves the various projects from "type-based" folders (such as
"services" or "tools") into more appropriate semantic folders (such as
"nix", "ops" or "web").

Deprecated projects (nixcon-demo & gotest) which only existed for
testing/demonstration purposes have been removed.

(Note: *all* builds are broken with this commit)

web/tazblog/src/Server.hs

@@ -0,0 +1,81 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Server where
+
+import Blog
+import BlogStore
+import Control.Applicative (optional)
+import Control.Monad (msum)
+import Control.Monad.IO.Class (liftIO)
+import Data.Maybe (maybe)
+import qualified Data.Text as T
+import Happstack.Server hiding (Session)
+import RSS
+
+pageSize :: Int
+pageSize = 3
+
+tmpPolicy :: BodyPolicy
+tmpPolicy = defaultBodyPolicy "/tmp" 0 200000 1000
+
+runBlog :: Int -> String -> IO ()
+runBlog port respath =
+  withCache "blog.tazj.in." $ \cache ->
+    simpleHTTP nullConf {port = port} $ tazblog cache respath
+
+tazblog :: BlogCache -> String -> ServerPart Response
+tazblog cache resDir =
+  msum
+    [ -- legacy language-specific routes
+      dir "de" $ blogHandler cache,
+      dir "en" $ blogHandler cache,
+      dir "static" $ staticHandler resDir,
+      blogHandler cache,
+      staticHandler resDir,
+      notFound $ toResponse $ showError "Not found" "Page not found"
+      ]
+
+blogHandler :: BlogCache -> ServerPart Response
+blogHandler cache =
+  msum
+    [ path $ \(eId :: Integer) -> showEntry cache $ EntryId eId,
+      nullDir >> showIndex cache,
+      dir "rss" $ nullDir >> showRSS cache,
+      dir "rss.xml" $ nullDir >> showRSS cache
+      ]
+
+staticHandler :: String -> ServerPart Response
+staticHandler resDir = do
+  setHeaderM "cache-control" "max-age=630720000"
+  setHeaderM "expires" "Tue, 20 Jan 2037 04:20:42 GMT"
+  serveDirectory DisableBrowsing [] resDir
+
+showEntry :: BlogCache -> EntryId -> ServerPart Response
+showEntry cache eId = do
+  entry <- getEntry cache eId
+  tryEntry entry
+
+tryEntry :: Maybe Entry -> ServerPart Response
+tryEntry Nothing = notFound $ toResponse $ showError "Not found" "Blog entry not found"
+tryEntry (Just entry) = ok $ toResponse $ blogTemplate eTitle $ renderEntry entry
+  where
+    eTitle = T.append ": " (title entry)
+
+offset :: Maybe Int -> Int
+offset = maybe 0 (pageSize *)
+
+showIndex :: BlogCache -> ServerPart Response
+showIndex cache = do
+  (page :: Maybe Int) <- optional $ lookRead "page"
+  entries <- listEntries cache (offset page) pageSize
+  ok $ toResponse $ blogTemplate ""
+    $ renderEntries entries (Just $ showLinks page)
+
+showRSS :: BlogCache -> ServerPart Response
+showRSS cache = do
+  entries <- listEntries cache 0 4
+  feed <- liftIO $ renderFeed entries
+  setHeaderM "content-type" "text/xml"
+  ok $ toResponse feed