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initial commit of WIP code

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Sridhar Ratnakumar 2021-04-19 11:07:52 -04:00
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.ghcid Normal file
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--warnings -T "Ema.Example.runSimpleSitePure"

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name: "Build"
on:
pull_request:
push:
jobs:
build:
runs-on: ubuntu-latest
env:
MAINLINE: refs/heads/master
steps:
- uses: actions/checkout@v2
- uses: cachix/install-nix-action@v13
with:
install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
extra_nix_config: |
experimental-features = nix-command flakes
# This downloads deps from Nix cache, builds neuron, as well as run tests
- name: Build 🔧
run: |
nix build -j4

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dist
dist-*
cabal-dev
*.o
*.hi
*.hie
*.chi
*.chs.h
*.dyn_o
*.dyn_hi
.hpc
.hsenv
.cabal-sandbox/
cabal.sandbox.config
*.prof
*.aux
*.hp
*.eventlog
.stack-work/
cabal.project.local
cabal.project.local~
.HTF/
.ghc.environment.*
result
result-*

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.vscode/extensions.json vendored Normal file
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{
// See https://go.microsoft.com/fwlink/?LinkId=827846
// for the documentation about the extensions.json format
"recommendations": [
"haskell.haskell",
"arrterian.nix-env-selector",
"bbenoist.nix"
]
}

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.vscode/settings.json vendored Normal file
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{
"editor.formatOnType": true,
"editor.formatOnSave": true,
"nixEnvSelector.nixFile": "${workspaceRoot}/shell.nix"
}

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.vscode/tasks.json vendored Normal file
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{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"label": "Ema Example Server",
"type": "shell",
"command": "bin/run",
"args": [],
"problemMatcher": [],
"group": {
"kind": "build",
"isDefault": true
},
"runOptions": {
"runOn": "folderOpen"
}
}
]
}

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# Revision history for ema
## 0.1.0.0 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

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LICENSE Normal file
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

22
README.md
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@ -3,3 +3,25 @@
**WIP**
ema is the next-generation static site generator and live server that hot-reload's on code *or* data change.
## Hacking
Open in VSCode, and run the build task.
## TODO
- [x] MVP
- [ ] Implement hot reload, and ditch browser-sync
- [x] server to client refresh
- [ ] client to server reconnect (on ghcid reload, or accidental client disconnect)
- [ ] or, investigate https://hackage.haskell.org/package/ghci-websockets
- [ ] Example: filesystem watcher
public,
- [ ] refactor and simplify
- [ ] examples
doc notes,
- use async:race to avoid ghcid ghosts
- at most one ws client supported right now
- tailwind + blaze-html layout (BlazeWind?) for no-frills getting started

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bin/format Executable file
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#!/usr/bin/env nix-shell
#! nix-shell ../shell.nix -i bash
set -xe
find src -name \*.hs | xargs ormolu -m inplace
nixpkgs-fmt *.nix
cabal-fmt -i *.cabal

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#!/usr/bin/env bash
set -xe
exec nix-shell --run ghcid

83
ema.cabal Normal file
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cabal-version: 2.4
name: ema
version: 0.1.0.0
license: AGPL-3.0-only
copyright: 2020 Sridhar Ratnakumar
maintainer: srid@srid.ca
author: Sridhar Ratnakumar
category: Web
-- A short (one-line) description of the package.
-- synopsis:
-- A longer description of the package.
-- description:
-- A URL where users can report bugs.
-- bug-reports:
extra-source-files:
CHANGELOG.md
README.md
LICENSE
library
-- Modules included in this executable, other than Main.
-- other-modules:
-- LANGUAGE extensions used by modules in this package.
-- other-extensions:
build-depends:
, aeson
, async
, base ^>=4.14.1.0
, blaze-html
, blaze-markup
, containers
, data-default
, directory
, filepath
, http-types
, mtl
, neat-interpolation
, optparse-applicative
, parser-combinators
, relude
, stm
, text
, time
, wai
, wai-app-static
, wai-websockets
, warp
, websockets
-- record-hasfield is included due to https://github.com/commercialhaskell/stackage/issues/4449
mixins:
base hiding (Prelude),
relude (Relude as Prelude, Relude.Container.One),
relude
ghc-options:
-Wall -Wincomplete-record-updates -Wincomplete-uni-patterns
default-extensions:
FlexibleContexts
FlexibleInstances
KindSignatures
LambdaCase
MultiParamTypeClasses
MultiWayIf
OverloadedStrings
ScopedTypeVariables
TupleSections
ViewPatterns
other-modules:
Ema.App
Ema.Example
Ema.Layout
Ema.Route
hs-source-dirs: src
default-language: Haskell2010

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flake.lock Normal file
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{
"nodes": {
"flake-compat": {
"flake": false,
"locked": {
"lastModified": 1606424373,
"narHash": "sha256-oq8d4//CJOrVj+EcOaSXvMebvuTkmBJuT5tzlfewUnQ=",
"owner": "edolstra",
"repo": "flake-compat",
"rev": "99f1c2157fba4bfe6211a321fd0ee43199025dbf",
"type": "github"
},
"original": {
"owner": "edolstra",
"repo": "flake-compat",
"type": "github"
}
},
"flake-utils": {
"locked": {
"lastModified": 1618217525,
"narHash": "sha256-WGrhVczjXTiswQaoxQ+0PTfbLNeOQM6M36zvLn78AYg=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "c6169a2772643c4a93a0b5ac1c61e296cba68544",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1618447066,
"narHash": "sha256-2f9ydxgdW2igSIe1vmV8buTEpAVQPVhV+OxvlFRTA+Y=",
"owner": "nixos",
"repo": "nixpkgs",
"rev": "dcdf30a78a523296b5f9d44fb67afac485b64737",
"type": "github"
},
"original": {
"owner": "nixos",
"repo": "nixpkgs",
"rev": "dcdf30a78a523296b5f9d44fb67afac485b64737",
"type": "github"
}
},
"root": {
"inputs": {
"flake-compat": "flake-compat",
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

42
flake.nix Normal file
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{
description = "Ema project";
inputs = {
nixpkgs.url = "github:nixos/nixpkgs/dcdf30a78a523296b5f9d44fb67afac485b64737";
flake-utils.url = "github:numtide/flake-utils";
flake-compat = {
url = "github:edolstra/flake-compat";
flake = false;
};
};
outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
let
overlays = [ ];
pkgs = import nixpkgs { inherit system overlays; };
emaProject = returnShellEnv:
pkgs.haskellPackages.developPackage {
inherit returnShellEnv;
name = "ema";
root = ./.;
withHoogle = false;
modifier = drv:
pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
[
cabal-install
cabal-fmt
pkgs.nixpkgs-fmt
ghcid
ormolu
haskell-language-server
]);
};
in
{
# Built by `nix build .`
defaultPackage = emaProject false;
# This is used by `nix develop .` to open a shell for use with
# `cabal`, `hlint` and `haskell-language-server`
devShell = emaProject true;
});
}

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hie.yaml Normal file
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cradle:
cabal:
- path: "./src"
component: "library:ema"

13
shell.nix Normal file
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(import
(
let
lock = builtins.fromJSON (builtins.readFile ./flake.lock);
in
fetchTarball {
url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
sha256 = lock.nodes.flake-compat.locked.narHash;
}
)
{
src = ./.;
}).shellNix

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
module Ema.App where
import Control.Concurrent.Async (race_)
import Control.Concurrent.STM.TVar (swapTVar)
import Control.Exception (try)
import qualified Data.Text as T
import Ema.Route (IsRoute (..))
import GHC.IO.Handle (BufferMode (LineBuffering), hSetBuffering)
import NeatInterpolation (text)
import qualified Network.HTTP.Types as H
import qualified Network.Wai as Wai
import qualified Network.Wai.Handler.Warp as Warp
import qualified Network.Wai.Handler.WebSockets as WaiWs
import Network.WebSockets (ConnectionException)
import qualified Network.WebSockets as WS
-- A mutable variable with change notification
--
-- one subscriber only (because of TMVar)
--
-- TODO: Rename to @TVarO@ and put in a module
-- TODO: refactor? https://hackage.haskell.org/package/websockets-0.7.2.0/docs/Network-WebSockets-Util-PubSub.html
data Changing a = Changing
{ changingTVar :: TVar a,
changingEvent :: TMVar ()
}
data Ema s r = Ema
{ emaModel :: Changing s,
emaRenderRoute :: s -> r -> LByteString
}
-- | Run Ema live server
--
-- Continually observe the world, with a concomitant incremental update of the
-- model so as to hot-reload the browser view.
runEma ::
forall model route.
(Show route, IsRoute route) =>
Ema model route ->
IO ()
runEma ema = do
-- TODO: Use a logging library, in place of managing buffering and using putStrLn
hSetBuffering stdout LineBuffering
hSetBuffering stderr LineBuffering
putStrLn "Launching Ema"
let settings = Warp.setPort 8000 Warp.defaultSettings
currentWsConn :: TVar (Maybe (route, WS.Connection)) <- newTVarIO Nothing
-- bracket helps clean up after ghcid reboot
race_ (notifyWsClient currentWsConn) $
Warp.runSettings settings $ WaiWs.websocketsOr WS.defaultConnectionOptions (wsApp currentWsConn) httpApp
where
notifyWsClient currentWsConn = do
let log s = putTextLn $ " :: " <> s
ch = changingEvent $ emaModel ema
forever $ do
-- FIXME: 100% cpu usage if currentWsConn is nothing?
-- Just spawn this thread on demand, when conn comes in.
readTVarIO currentWsConn >>= \case
Nothing -> pure ()
Just (r, conn) -> do
atomically $ takeTMVar ch
log $ "Sending new HTML for: " <> show r
s <- routeBS r
try (WS.sendTextData conn s) >>= \case
Right () -> pure ()
Left (err :: ConnectionException) ->
log $ "notify:: " <> show err
wsApp currentWsConn pendingConn = do
let log s = putTextLn $ " :: " <> s
log "ws connected"
conn :: WS.Connection <- WS.acceptRequest pendingConn
WS.withPingThread conn 30 (pure ()) $ do
watchingRoute :: Text <- WS.receiveData conn
let pathInfo = filter (/= "") $ T.splitOn "/" $ T.drop 1 watchingRoute
r :: route = fromMaybe (error "invalid route from ws") $ fromSlug $ fromString . toString <$> pathInfo
log $ "Browser loaded: " <> show pathInfo <> " => " <> show r
-- NOTE: only one active client is supported for hot-reload; not
-- bothering with client management for now, because that will require
-- broadcast TChan.
void $ atomically $ swapTVar currentWsConn $ Just (r, conn)
let loop = do
try (WS.receiveDataMessage conn) >>= \case
Right (_ :: WS.DataMessage) -> loop
Left (err :: ConnectionException) -> do
log $ "wsApp:: " <> show err
void $ atomically $ swapTVar currentWsConn Nothing
loop
-- WS.sendTextData conn ("reload" :: Text)
-- WS.sendClose conn ("close" :: Text)
httpApp req f = do
print $ Wai.pathInfo req
let mr = fromSlug $ fromString . toString <$> Wai.pathInfo req
(status, v) <- case mr of
Nothing ->
pure (H.status404, "No route")
Just r -> do
(H.status200,) <$> routeBS r
f $ Wai.responseLBS status [(H.hContentType, "text/html")] v
routeBS :: route -> IO LByteString
routeBS r = do
s <- readTVarIO $ changingTVar $ emaModel ema
pure $ emaRenderRoute ema s r <> wsClientShim
-- TODO: Auto reconnect when server reloads
wsClientShim =
encodeUtf8
[text|
<script>
// https://stackoverflow.com/a/47614491/55246
function setInnerHtml(elm, html) {
elm.innerHTML = html;
Array.from(elm.querySelectorAll("script")).forEach(oldScript => {
const newScript = document.createElement("script");
Array.from(oldScript.attributes)
.forEach(attr => newScript.setAttribute(attr.name, attr.value));
newScript.appendChild(document.createTextNode(oldScript.innerHTML));
oldScript.parentNode.replaceChild(newScript, oldScript);
});
}
window.onpageshow = () => {
console.log("ema: Opening ws conn");
var ws = new WebSocket("ws://" + window.location.host);
ws.onopen = () => {
console.log("ema: Observing server for changes");
ws.send(document.location.pathname);
};
ws.onclose = () => {
console.log("ema: closed");
};
ws.onmessage = evt => {
// console.log(evt.data);
console.log("ema: Resetting HTML body")
setInnerHtml(document.documentElement, evt.data);
// document.documentElement.innerHTML = evt.data;
// ws.close();
// history.go(0);
};
window.onbeforeunload = evt => { ws.close(); };
window.onpagehide = evt => { ws.close(); };
};
</script>
|]
-- | Pure version of @runEma@ that is independent of the world outside the program.
--
-- Due to purity, there is no model that varies over time. The render function
-- can use any value from the closure.
runEmaPure ::
forall r.
(IsRoute r, Show r) =>
-- | How to render a route
(r -> LByteString) ->
IO ()
runEmaPure render = do
model <- Changing <$> newTVarIO () <*> newEmptyTMVarIO
let ema = Ema model (const render)
runEma ema

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{-# LANGUAGE TypeApplications #-}
module Ema.Example where
import Control.Concurrent (threadDelay)
import Control.Concurrent.Async (race_)
import Control.Concurrent.STM.TVar (swapTVar)
import Data.List ((!!))
import qualified Data.Text as T
import Data.Time
( UTCTime,
defaultTimeLocale,
formatTime,
getCurrentTime,
)
import Ema.App (Changing (Changing), Ema (Ema), runEma, runEmaPure)
import qualified Ema.Layout as Layout
import Ema.Route (IsRoute (..), Slug (unSlug))
import Text.Blaze.Html5 ((!))
import qualified Text.Blaze.Html5 as H
import qualified Text.Blaze.Html5.Attributes as A
-- First, the simplest example using @runEmaPure@
-- ----------------------------------------------
runHelloWorld :: IO ()
runHelloWorld = do
let name :: Text = "Srid"
runEmaPure $ \() ->
encodeUtf8 $ "Hello, " <> name
-- Next, an example involving routes & impure data (current time) using @runEma@
-- -----------------------------------------------------------------------------
data PeopleRoute
= PR_Index
| PR_Person Text
deriving (Show)
instance IsRoute PeopleRoute where
toSlug = \case
PR_Index -> mempty
PR_Person name -> one $ fromString . toString $ T.replace " " "_" name
fromSlug = \case
[] -> Just PR_Index
[person] -> Just $ PR_Person (T.replace "_" " " $ unSlug person)
_ -> Nothing
timeC :: IO (Changing UTCTime, IO ())
timeC = do
var <- newTVarIO =<< getCurrentTime
ch <- newEmptyTMVarIO
let run = void $
forever $ do
now <- getCurrentTime
atomically $ do
void $ swapTVar var now
void $ tryPutTMVar ch ()
threadDelay $ 1 * 1000000
pure (Changing var ch, run)
runSimpleSitePure :: IO ()
runSimpleSitePure = do
(model, runTimeC) <- timeC
race_ runTimeC $
runEma $
Ema model $ \now r ->
Layout.tailwindSite (H.title "Simple Site") $
H.div ! A.class_ "container mx-auto" $ do
H.header ! A.class_ "text-4xl font-bold border-b-1" $ "Simple Site!"
case r of
PR_Index -> do
H.p ! A.style "color: red;" $ "Checkout some profiles:"
forM_ ["Srid Ratna", "ema", "Great India"] $ \person ->
H.li $
routeElem (PR_Person person) $
H.toMarkup person
PR_Person name -> do
H.header ! A.class_ "text-2xl" $ H.toMarkup $ "Profile of " <> name
H.div $ routeElem PR_Index "Go to Home"
H.footer ! A.class_ "border-t-1 p-2 text-center" $ do
"The current time is: "
H.pre ! A.class_ "text-4xl" $ do
let epoch = fromMaybe 0 . readMaybe @Int $ formatTime defaultTimeLocale "%s" now
colors = ["green", "purple", "red", "blue"]
color = colors !! mod epoch (length colors)
cls = "text-" <> color <> "-500"
H.span ! A.class_ cls $ H.toMarkup $ formatTime defaultTimeLocale "%Y/%m/%d %H:%M:%S" now
where
routeElem r w =
H.a ! A.class_ "text-xl text-purple-500 hover:underline" ! routeHref r $ w
routeHref r =
A.href (fromString . toString $ routeUrl r)
-- Finally, an advanced example demonstrating how to build something like neuron
-- -----------------------------------------------------------------------------
{-
type Zk = Map FilePath ()
runNeuron :: FilePath -> IO ()
runNeuron fp = do
s <- neuronModel fp
runEma $
Ema s $ \_zk () -> do
"TODO"
neuronModel :: FilePath -> IO (Changing Zk)
neuronModel notebookDir = do
ch <- watchDir notebookDir
buildWorldIncrementally mempty ch $ \zk diff ->
foldl' go zk (Map.toList diff)
where
watchDir :: FilePath -> IO (TBQueue (Map FilePath (Maybe ByteString)))
watchDir = undefined
buildWorldIncrementally ::
state ->
TBQueue worldChange ->
(state -> worldChange -> state) ->
IO (Changing state)
buildWorldIncrementally _state0 _change _f =
undefined
go zk (k, mv) = case mv of
Nothing ->
-- Deleted!
Map.delete k zk
Just newVal ->
Map.insert k (parseMarkdown newVal) zk
parseMarkdown = const ()
-}

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{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TypeApplications #-}
module Ema.Layout where
import NeatInterpolation (text)
import qualified Text.Blaze.Html.Renderer.Utf8 as RU
import Text.Blaze.Html5 ((!))
import qualified Text.Blaze.Html5 as H
import qualified Text.Blaze.Html5.Attributes as A
-- | A simple and off-the-shelf layout using Tailwind CSS
-- TODO: Allow customizing twindShim preflight classes (see below), including google fonts.
tailwindSite :: H.Html -> H.Html -> LByteString
tailwindSite appHead appBody = RU.renderHtml $ do
H.docType
H.html ! A.lang "en" $ do
H.head $ do
H.meta ! A.charset "UTF-8"
H.meta ! A.name "viewport" ! A.content "width=device-width, initial-scale=1"
appHead
googleFonts
-- Using shim doesn't work very well with hot-reload.
-- TODO: Conditionally use shim, when statically generating the site
-- twindShim'
twindCdn
H.body $ do
appBody
twindCdn :: H.Html
twindCdn =
H.unsafeByteString . encodeUtf8 $
[text|
<link href="https://unpkg.com/tailwindcss@2.1.1/dist/tailwind.min.css" rel="stylesheet" type="text/css">
|]
twindShim :: H.Html
twindShim =
H.unsafeByteString . encodeUtf8 $
[text|
<script type="module" src="https://cdn.skypack.dev/twind/shim"></script>
|]
twindShim' :: H.Html
twindShim' = do
H.script
! A.type_ "text/javascript"
! A.src "https://cdn.jsdelivr.net/combine/npm/twind/twind.umd.min.js,npm/twind/observe/observe.umd.min.js"
$ ""
H.script
! A.type_ "text/javascript"
$ (fromString . toString) twindShimJS'
twindShimJS' :: Text
twindShimJS' =
[text|
twind.setup({
theme: {
extend: {
fontFamily: (theme) => ({
sans: ["DM Sans", theme("fontFamily.sans")],
serif: ["Roboto", theme("fontFamily.serif")]
})
}
},
preflight: {
body: {
"@apply": "text-gray-700"
},
"a:any-link": {
"@apply": "no-underline hover:font-bold"
},
p: {
"@apply": "mb-2"
},
"header.pageHeader": {
"@apply": "mb-4 border-l-4 pl-2 hover:(shadow-sm bg-pink-50)"
}
},
})
twindObserve.observe(document.documentElement)
|]
googleFonts :: H.Markup
googleFonts =
-- Using unsafe string only for convenience when copy-pasting from Google Fonts.
H.unsafeByteString . encodeUtf8 $
[text|
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=DM+Sans:wght@500&family=Roboto&display=swap" rel="stylesheet">
|]

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{-# LANGUAGE InstanceSigs #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TypeFamilies #-}
module Ema.Route where
import Data.Default (Default, def)
import qualified Data.Text as T
import System.FilePath (joinPath)
-- ---- [Slug] ----
newtype Slug = Slug {unSlug :: Text}
deriving (Eq)
instance IsString Slug where
fromString :: HasCallStack => String -> Slug
fromString (toText -> s) =
if "/" `T.isInfixOf` s
then error ("Slug cannot contain a slash: " <> s)
else Slug s
-- ---- [Route] ----
class IsRoute r where
-- | Determine the route for the given URL slug
fromSlug :: [Slug] -> Maybe r
-- | The URL slug to use for a given route.
toSlug :: r -> [Slug]
-- | Relative URL to use in "href"
routeUrl :: r -> Text
routeUrl =
routeUrlWithStrategy def
-- | Relative file path to .html file correspondong to this route.
routeFile :: r -> FilePath
routeFile =
routeFileWithStrategy def
instance IsRoute () where
fromSlug = \case
[] -> Just ()
_ -> Nothing
toSlug () = []
-- ---- [UrlStrategy] ----
data UrlStrategy
= UrlStrategy_FolderOnly
| -- | Pretty URLs without ugly .html ext or slash-suffix
UrlStrategy_HtmlOnlySansExt
deriving (Eq, Show, Ord)
instance Default UrlStrategy where
def = UrlStrategy_HtmlOnlySansExt
routeUrlWithStrategy :: IsRoute r => UrlStrategy -> r -> Text
routeUrlWithStrategy strat r =
case strat of
UrlStrategy_FolderOnly ->
"/" <> T.replace "index.html" "" (toText $ routeFile r)
UrlStrategy_HtmlOnlySansExt ->
-- FIXME: This should replace only at the end, not middle
let fp = toText (routeFile r)
in if
| "index.html" == fp ->
"/"
| "/index.html" `T.isSuffixOf` fp ->
"/" <> T.take (T.length fp - T.length "/index.html") fp
| ".html" `T.isSuffixOf` fp ->
"/" <> T.take (T.length fp - T.length ".html") fp
| otherwise ->
"/" <> fp
routeFileWithStrategy :: IsRoute r => UrlStrategy -> r -> FilePath
routeFileWithStrategy strat (toSlug -> slugs) =
case strat of
UrlStrategy_FolderOnly ->
joinPath $ fmap (toString . unSlug) slugs <> ["index.html"]
UrlStrategy_HtmlOnlySansExt ->
let (term :| (reverse -> parts)) = fromMaybe ("index" :| []) $ nonEmpty (reverse $ fmap unSlug slugs)
in joinPath $ fmap toString parts <> [toString term <> ".html"]