Update editor and tooling support

ecosystem/Editor-and-tool-support.md

@@ -1,51 +1,111 @@
+# Editor and tool support
 
-## Editors
+The PureScript ecosystem contains a number of editor plugins and tools to help you build libraries and applications. The set of available tools is growing continuously, but this documentation contains popular, stable tools that you can use today.
 
-#### Atom
+At minimum, almost all projects will use:
 
-- [purescript-contrib/atom-language-purescript](https://github.com/purescript-contrib/atom-language-purescript) provides syntax highlighting
-- [nwolverson/atom-ide-purescript](https://github.com/nwolverson/atom-ide-purescript) provides build support,   REPL, and autocomplete etc. via [psc-ide](https://github.com/purescript/purescript/tree/master/psc-ide)
+- The [PureScript compiler](https://github.com/purescript/purescript)
+- The [Spago](https://github.com/purescript/spago) build tool and package manager
 
-#### Emacs
-Install these two packages and follow the instructions in the `psc-ide-emacs` README.
-- [purescript-mode](https://github.com/purescript-emacs/purescript-mode) Syntax Highlighting and indentation (adapted from haskell-mode)
-- [psc-ide-emacs](https://github.com/purescript-emacs/psc-ide-emacs) Emacs plugin exposing the compilers IDE support
+These tools can be installed via [NPM](https://www.npmjs.com), among other installation methods.
 
-PSCI support via comint:
+## Editor support
 
-- [psci-mode](https://github.com/purescript-emacs/emacs-psci) is a REPL minor mode
+The PureScript compiler includes an IDE server, [`purs ide`](https://github.com/purescript/purescript/tree/master/psc-ide), to supply tooling for editors. This server has been used to implement a [PureScript language server](https://github.com/nwolverson/purescript-language-server), which implements the [Language Server Protocol](https://langserver.org) for PureScript. Major editor tooling either uses `purs ide server` directly or via the language server.
 
-Spacemacs users can just use the [`purescript` layer](https://github.com/syl20bnr/spacemacs/tree/master/layers/%2Blang/purescript).
+Most editor plugins which rely on PureScript's IDE tooling have at least these features:
 
-#### Sublime Text 2
+- Autocomplete (including auto-imports)
+- Definitions and error reporting on hover
+- Go-to-definition and local search
+- REPL support
+- Automatic builds
+- Error suggestions and quick-fix actions for missing type signatures, imports, and more
+- Case split for type-driven development
 
-- [PureScript package](https://sublime.wbond.net/search/PureScript) by joneshf
+### General
 
-#### Vim
+Some tools are commonly used with several editors, as they are implemented to be editor-agnostic:
 
-- [purescript-vim](https://github.com/raichoo/purescript-vim) syntax highlighting and indentation
-- [FrigoEU/psc-ide-vim](https://github.com/FrigoEU/psc-ide-vim/)
-- [w0rp/ale](https://github.com/w0rp/ale) supports the [purescript-language-server](https://github.com/nwolverson/purescript-language-server)
+- [psa](https://github.com/natefaubion/purescript-psa) is a pretty, flexible error/warning reporting frontend for the compiler featuring colours, original source spans in errors, warning filtering and persistence.
+- [pscid](https://github.com/kRITZCREEK/pscid) is a lightweight file-watcher and test runner which provides instant-rebuilds in an editor agnostic way.
 
-#### VS Code
+To generate `TAGS` files, use `purs docs --format etags` (or `--format ctags`).
 
-- [nwolverson/vscode-ide-purescript](https://github.com/nwolverson/vscode-ide-purescript)
+### Atom
 
-#### General
+- [atom-language-purescript](https://github.com/purescript-contrib/atom-language-purescript) provides syntax highlighting for `.purs` files.
+- [atom-ide-purescript](https://github.com/nwolverson/atom-ide-purescript) provides editor support via `purs ide`.
 
-- To generate `TAGS` files, use `purs docs --format etags` (or `--format ctags`)
+### Emacs
 
-## Build tools and package managers
+- [psc-ide-emacs](https://github.com/purescript-emacs/psc-ide-emacs) provides editor support via `purs ide`.
+- [purescript-mode](https://github.com/purescript-emacs/purescript-mode) provides syntax highlighting and indentation rules for `.purs` files.
+- [psci-mode](https://github.com/purescript-emacs/emacs-psci) provides a minor mode for a PureScript REPL.
 
-Maintained:
-- [spago](https://github.com/purescript/spago) - PureScript package manager and build tool powered by [Dhall](https://github.com/dhall-lang/dhall-lang) and [package-sets](https://github.com/purescript/package-sets)
-- [psc-package](https://github.com/purescript/psc-package) - A package manager for PureScript based on the concept of package sets
-- [purs-loader](https://github.com/ethul/purs-loader/) - PureScript loader for WebPack
-- [pscid](https://github.com/kRITZCREEK/pscid) is a lightweight file-watcher/testrunner for PS projects providing instant-rebuilds in an editor agnostic way
-- [purescript-psa](https://github.com/natefaubion/purescript-psa) - A pretty, flexible error/warning reporting frontend for `psc` featuring colours, original source spans in errors, warning filtering and persistence.
-- [Pulp](https://github.com/purescript-contrib/pulp) - a standalone build system for PureScript ([pulp](https://www.npmjs.com/package/pulp) in `npm`). *Spago is recommended over Pulp.*
-- [Gulp task](https://github.com/purescript-contrib/gulp-purescript) (`gulp-purescript` in `npm`). *Spago is recommended over the PureScript Gulp task.*
+Spacemacs users can use the [PureScript layer](https://github.com/syl20bnr/spacemacs/tree/master/layers/%2Blang/purescript).
 
-Unmaintained:
-- [psvm-js](https://github.com/ThomasCrvsr/psvm-js) - PureScript Version Manager
-- [psc-pane](https://github.com/anttih/psc-pane) - Auto reloading compiler which formats a single error to fit the window
+### Sublime Text 3
+
+- [purescript-ide-sublime](https://packagecontrol.io/packages/PureScript) provides editor support via `purs ide` and syntax highlighting for `.purs` files.
+
+### Vim
+
+- [psc-ide-vim](https://github.com/FrigoEU/psc-ide-vim) provides editor support via `purs ide`.
+- [ale](https://github.com/dense-analysis/ale) provides editor support via the PureScript language server.
+- [coc.nvim](https://github.com/neoclide/coc.nvim) provides editor support via the PureScript language server.
+- [purescript-vim](https://github.com/raichoo/purescript-vim) provides syntax highlighting and indentation rules for `.purs` files.
+
+### VSCode
+
+- [ide-purescript](https://marketplace.visualstudio.com/items?itemName=nwolverson.ide-purescript) provides editor support via the PureScript language server.
+- [language-purescript](https://marketplace.visualstudio.com/items?itemName=nwolverson.language-purescript) provides syntax highlighting for `.purs` files.
+
+## Tooling support
+
+There are many tools available to help you develop libraries and applications in PureScript. These include build tools, package managers, code formatters, dead code elimination tools, GitHub Actions, Nix tools, and more.
+
+### Build tools and package managers
+
+There are several build tools and package managers available for PureScript.
+
+- [spago](https://github.com/purescript/spago) is the standard package manager and build tool for Purescript, powered by [Dhall](https://github.com/dhall-lang/dhall-lang) and [package-sets](https://github.com/purescript/package-sets).
+
+These build tools are maintained, but are no longer recommended for most projects (use Spago instead):
+
+- [psc-package](https://github.com/purescript/psc-package) is a package manager for PureScript based on [package-sets](https://github.com/purescript/package-sets) and a precursor to Spago.
+- [pulp](https://github.com/purescript-contrib/pulp) is a standalone build system for PureScript which relies on [Bower](https://github.com/bower/bower) for package management and a precursor to Spago.
+
+### Development tools
+
+- [setup-purescript](https://github.com/purescript-contrib/setup-purescript) is a GitHub Action which sets up a PureScript toolchain with common tools including the compiler and Spago for continuous integration.
+- [purty](https://gitlab.com/joneshf/purty) is a formatter / pretty-printer for PureScript source code.
+- [zephyr](https://github.com/coot/zephyr) is a dead code elimination tool for PureScript applications which can be used to reduce bundle sizes.
+
+#### For Nix users
+
+There are some tools meant specifically for Nix users, who may not be able to use installation methods like NPM.
+
+- [easy-purescript-nix](https://github.com/justinwoo/easy-purescript-nix) provides many common tools in the PureScript community like the compiler (`purs`), `spago`, `pscid`, `zephyr`, and more for Nix environments.
+- [spago2nix](https://github.com/justinwoo/spago2nix) helps you generate Nix expressions for your Spago dependencies.
+- [yarn2nix](https://github.com/nix-community/yarn2nix) helps you generate Nix expressions for your JavaScript dependencies.
+
+### Backend-specific tooling
+
+PureScript projects which use alternate backends may use tools from the ecosystem of the target language. This documentation is a non-exhaustive starting point for some tools you may find useful when working with particular backends for PureScript.
+
+#### JavaScript
+
+PureScript projects which target JavaScript may find some tools from the JavaScript ecosystem. PureScript code which imports libraries from JavaScript will at least require a JavaScript package manager (to install dependencies) and a JavaScript bundling tool (to resolve JavaScript imports, among other things). You may also want to use a linter for any JavaScript code you are writing via the FFI.
+
+- Some popular package managers in JavaScript include [npm](https://www.npmjs.com) (recommended), [yarn](https://yarnpkg.com), and [pnpm](https://pnpm.js.org).
+- Some popular bundlers in JavaScript include [webpack](https://webpack.js.org) (recommended) with the [purs-loader](https://github.com/ethul/purs-loader) PureScript loader, and [parcel](https://parceljs.org). Other JavaScript bundlers like [rollup](https://github.com/rollup/rollup) rely on ES Modules, which PureScript does not yet support.
+- Some popular linters include [eslint](https://eslint.org) and [jsconfig](https://code.visualstudio.com/docs/languages/jsconfig).
+
+### Deprecated and unmaintained tools
+
+These tools were previously mentioned in this documentation, but are no longer maintained or recommended:
+
+- [gulp-purescript](https://github.com/purescript-deprecated/gulp-purescript) was a Gulp task for Purescript`npm`).
+- [psvm-js](https://github.com/ThomasCrvsr/psvm-js) was a version manager (like `nvm` for Node) for PureScript compiler versions.
+- [psc-pane](https://github.com/anttih/psc-pane) provided auto-reloading builds which formatted a single error to fit the window.