Update the hie-bios commit SHA (#1825)

* Update the hie-bios commit SHA

* Also update the SHA in our bazel WORKSPACE

* Update the hash too

* Tutorial for Emacs integration

* Update hie-bios patch

hie-core-in-emacs.md

@@ -0,0 +1,50 @@
+# How to get `hie-core` working in Emacs
+
+First step is to install required Emacs packages. If you don't already have Melpa config stuff in your `.emacs`, put this stanza at the top.
+```
+;;Melpa packages support
+(require 'package)
+(let* ((no-ssl (and (memq system-type '(windows-nt ms-dos))
+                    (not (gnutls-available-p))))
+       (proto (if no-ssl "http" "https")))
+  (when no-ssl
+    (warn "\
+Your version of Emacs does not support SSL connections,
+which is unsafe because it allows man-in-the-middle attacks.
+There are two things you can do about this warning:
+1. Install an Emacs version that does support SSL and be safe.
+2. Remove this warning from your init file so you won't see it again."))
+  ;; Comment/uncomment these two lines to enable/disable MELPA and MELPA Stable as desired
+  (add-to-list 'package-archives (cons "melpa" (concat proto "://melpa.org/packages/")) t)
+  ;;(add-to-list 'package-archives (cons "melpa-stable" (concat proto "://stable.melpa.org/packages/")) t)
+  (when (< emacs-major-version 24)
+    ;; For important compatibility libraries like cl-lib
+    (add-to-list 'package-archives (cons "gnu" (concat proto "://elpa.gnu.org/packages/")))))
+(package-initialize)
+;; Remember : to avoid package-not-found errors, refresh the package
+;; database now and then with M-x package-refresh-contents.
+```
+
+When this is in your `.emacs` and it's been evaluated, `M-x package-refresh-contents` to get the package database downloaded and then `M-x package-list-packages` to display the available packages. Click on a package to install it. You'll need to install the following packages.
+- `lsp-haskell`
+- `lsp-ui`
+- `flycheck`
+- `yasnippet`
+
+When done with this, add the following lines to your `.emacs` :
+```
+;; lsp-haskell
+(require 'lsp)
+(require 'lsp-haskell)
+(require 'yasnippet)
+(add-hook 'haskell-mode-hook #'lsp)
+(setq lsp-haskell-process-path-hie "hie-core")
+(setq lsp-haskell-process-args-hie '())
+(setq lsp-log-io t) ;; Inspect comms betweeen lsp client/server
+```
+
+Next stop is to build `hie-core`. In the `daml` repository, navigate to `//compiler/hie-core` and invoked `stack build`. This will install the `hie-core` executable into a location along the lines of `/Users/shaynefletcher/project/daml.git/compiler/hie-core/.stack-work/install/x86_64-osx/nightly-2019-05-20/8.6.5/bin/hie-core`. You want to get this executable in your `$PATH`. I achieved this by `ln -s /Users/shaynefletcher/project/daml.git/compiler/hie-core/.stack-work/install/x86_64-osx/nightly-2019-05-20/8.6.5/bin/hie-core ~/.local/bin/hie-core` (because `~/.local/bin` is put in my `PATH` in my `~/.bashrc`).
+
+Time to test things out. It's important to note that you for this to work, your programs need to be compiled with the same compiler used to build `hie-core`. For testing, I've been using the `ghc-lib-gen` target of the `ghc-lib` project). Navigate to the root of `ghc-lib`, create an `hie.yaml` file with contents `cradle: {cabal: {component: "exe:ghc-lib-gen"}}`. Invoke `cabal new-configure -w ~/.stack/programs/~/.stack/programs/x86_64-osx/ghc-8.6.5/bin/ghc` (this is the `ghc` used by `stack` to build `hie-core` - consult `//compiler/hie-core/stack.yaml` to help work out what you should write here). This last step will create a file `cabal.project.local` with contents pointing `cabal` to use the desired `ghc`. You can build `ghc-lib-gen` from the `ghc-lib` directory with the command `cabal new-build` as you like.
+
+After the last step, you should be all set. Open `ghc-lib/ghc-lib-gen/src/Main.hs` in an Emacs buffer and, for example, hover should bring up type/definition info.

stack.yaml

@@ -9,6 +9,6 @@ extra-deps:
   - .
   - haskell-lsp-types
 - git: https://github.com/mpickering/hie-bios.git
-  commit: 9f9fe00591c429c410475349560252ca7e622f1b
+  commit: 8427e424a83c2f3d60bdd26c02478c00d2189a73
 nix:
   packages: [zlib]