Improve .ghc.environment (#59)

This pull request intends to make it easier to create a working
`.ghc.environment` file.

* The HyperHaskell app now accepts a local installation of
`hyper-haskell-server`
* Building the package `docs/ghc-env/ghc-env.cabal` should create a
suitable `.ghc.environment` file

Author: HeinrichApfelmus

CHANGELOG.md

@@ -3,11 +3,15 @@
 
 ### HyperHaskell app bundle
 
+**v2.4.2** — Snapshot release.
+
+* When using `cabal`, allow local compilation of `hyper-haskell-server`.
+
 **v2.4.1** — Snapshot release.
 
 * Fix "Insert Evaluation Cell Above"yp menu item.
 * Fix "Open…" and "Save As…" dialogs.
-* Look for `ghc` in both `~/.local/bin` and `~/.cabal/bin` when using `cabal`.
+* Look for `hyper-haskell-server` in both `~/.local/bin` and `~/.cabal/bin` when using `cabal`.
 
 **v2.4.0** — Snapshot release.
 

app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "HyperHaskell",
-  "version": "2.4.1",
+  "version": "2.4.2",
   "main": "src/main.js",
   "devDependencies": {
     "electron": "^38.2.2"

app/src/interpreter.js

@@ -99,6 +99,9 @@ exports.init = () => {
         } else {
           cmd = cmdNew
         }
+        if (packagePath) {
+          cmd = cwd + '/' + packagePath + '/hyper-haskell-server'
+        }
       }
     } else if (packageTool == 'cabal.project') {
       cmd = 'cabal'

docs/ghc-env/Main.hs

@@ -0,0 +1,4 @@
+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

docs/ghc-env/README.md

@@ -0,0 +1,11 @@
+This directory contains a dummy `.cabal` file for creating a `.ghc.environment` file with a consistent set of packages.
+
+To create a `.ghc.environment` file in this directory, run
+
+```
+./mk-ghc-env.sh
+```
+
+Put your worksheet into this directory as well, and enter `.` in the "cabal — .ghc.environment" settings
+
+![](settings-back-end-cabal.png)

docs/ghc-env/cabal.project

@@ -0,0 +1,2 @@
+packages: .
+write-ghc-environment-files: always

docs/ghc-env/ghc-env.cabal

@@ -0,0 +1,20 @@
+cabal-version: 3.0
+name:          ghc-env
+synopsis:      Dummy .cabal file to generate a consistent set of packages.
+version:       0.1.0.0
+build-type:    Simple
+
+executable package-db-dummy
+  main-is:            Main.hs
+  build-depends:
+    , base
+    , Chart
+    , Chart-diagrams
+    , deltaq          >=1.1 && <1.2
+    , diagrams-lib
+    , diagrams-svg
+    , hyper
+    , hyper-extra
+
+  build-tool-depends: hyper-haskell-server:hyper-haskell-server
+  hs-source-dirs:     .

docs/ghc-env/mk-ghc-env.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+cabal build && cabal install hyper-haskell-server --installdir=.

docs/ghc-env/settings-back-end-cabal.png

@@ -1,6 +1,6 @@
 ELECTRON := "electron"
 
-VERSION := "0.2.4.1"
+VERSION := "0.2.4.2"
 
 ######################################################################
 # Development targets