grocery-list

An experimental grocery list, nothing to say of yet!

Some hopes...

When an item is checked off of the grocery list, the time is recorded
- Save a UTC datetime for future algorithms
- Save a reference time so that we can ask questions about item order within a store.
  - Store layouts may differ, we may need to record stores (no gps, just a dropdown (initially?))
  - Reference time looks for clusters of check-times to determine an item proximity graph
Future duplicates of items are sorted in new lists based on the referential checked time
The application can be pinned to user devices as a PWA
- Needs an icon
- The app name needs to not be 'TODO'
The application should save the users grocery list on the device it's created on
The user can check an item off by taking a picture of the item.
- Create a personal database of food items - track prices, nutrition information, deals, link to other databases
- Let's the user search the personal food database by picture
- Let's the user share grocery lists by sending reference images to friends (so they finally get the right stuff!)

Below this line is the readme from the Sapper template. Keeping it for now

sapper-template

The default template for setting up a Sapper project. Can use either Rollup or webpack as bundler.

Getting started

Using `degit`

To create a new Sapper project based on Rollup locally, run

npx degit "sveltejs/sapper-template#rollup" my-app

For a webpack-based project, instead run

npx degit "sveltejs/sapper-template#webpack" my-app

degit is a scaffolding tool that lets you create a directory from a branch in a repository.

Replace my-app with the path where you wish to create the project.

Using GitHub templates

Alternatively, you can create the new project as a GitHub reposity using GitHub's template feature.

Go to either sapper-template-rollup or sapper-template-webpack and click on "Use this template" to create a new project repository initialized by the template.

Running the project

Once you have created the project, install dependencies and run the project in development mode:

cd my-app
npm install # or yarn
npm run dev

This will start the development server on localhost:3000. Open it and click around.

You now have a fully functional Sapper project! To get started developing, consult sapper.svelte.dev.

Using TypeScript

By default, the template uses plain JavaScript. If you wish to use TypeScript instead, you need some changes to the project:

Add typescript as well as typings as dependences in package.json
Configure the bundler to use svelte-preprocess and transpile the TypeScript code.
Add a tsconfig.json file
Update the project code to TypeScript

The template comes with a script that will perform these changes for you by running

node scripts/setupTypeScript.js

@sapper dependencies are resolved through src/node_modules/@sapper, which is created during the build. You therefore need to run or build the project once to avoid warnings about missing dependencies.

The script does not support webpack at the moment.

Directory structure

Sapper expects to find two directories in the root of your project — src and static.

src

The src directory contains the entry points for your app — client.js, server.js and (optionally) a service-worker.js — along with a template.html file and a routes directory.

src/routes

This is the heart of your Sapper app. There are two kinds of routes — pages, and server routes.

Pages are Svelte components written in .svelte files. When a user first visits the application, they will be served a server-rendered version of the route in question, plus some JavaScript that 'hydrates' the page and initialises a client-side router. From that point forward, navigating to other pages is handled entirely on the client for a fast, app-like feel. (Sapper will preload and cache the code for these subsequent pages, so that navigation is instantaneous.)

Server routes are modules written in .js files, that export functions corresponding to HTTP methods. Each function receives Express request and response objects as arguments, plus a next function. This is useful for creating a JSON API, for example.

There are three simple rules for naming the files that define your routes:

A file called src/routes/about.svelte corresponds to the /about route. A file called src/routes/blog/[slug].svelte corresponds to the /blog/:slug route, in which case params.slug is available to the route
The file src/routes/index.svelte (or src/routes/index.js) corresponds to the root of your app. src/routes/about/index.svelte is treated the same as src/routes/about.svelte.
Files and directories with a leading underscore do not create routes. This allows you to colocate helper modules and components with the routes that depend on them — for example you could have a file called src/routes/_helpers/datetime.js and it would not create a /_helpers/datetime route

static

The static directory contains any static assets that should be available. These are served using sirv.

In your service-worker.js file, you can import these as files from the generated manifest...

import { files } from '@sapper/service-worker';

...so that you can cache them (though you can choose not to, for example if you don't want to cache very large files).

Bundler configuration

Sapper uses Rollup or webpack to provide code-splitting and dynamic imports, as well as compiling your Svelte components. With webpack, it also provides hot module reloading. As long as you don't do anything daft, you can edit the configuration files to add whatever plugins you'd like.

Production mode and deployment

To start a production version of your app, run npm run build && npm start. This will disable live reloading, and activate the appropriate bundler plugins.

You can deploy your application to any environment that supports Node 10 or above. As an example, to deploy to Vercel Now when using sapper export, run these commands:

npm install -g vercel
vercel

If your app can't be exported to a static site, you can use the now-sapper builder. You can find instructions on how to do so in its README.

Using external components

When using Svelte components installed from npm, such as @sveltejs/svelte-virtual-list, Svelte needs the original component source (rather than any precompiled JavaScript that ships with the component). This allows the component to be rendered server-side, and also keeps your client-side app smaller.

Because of that, it's essential that the bundler doesn't treat the package as an external dependency. You can either modify the external option under server in rollup.config.js or the externals option in webpack.config.js, or simply install the package to devDependencies rather than dependencies, which will cause it to get bundled (and therefore compiled) with your app:

npm install -D @sveltejs/svelte-virtual-list

Bugs and feedback

Sapper is in early development, and may have the odd rough edge here and there. Please be vocal over on the Sapper issue tracker.

ConradMearns/grocery-list