From 7ee135c044a616b8cca565624412b75d4bb40211 Mon Sep 17 00:00:00 2001
From: Sridhar Ratnakumar <srid@srid.ca>
Date: Thu, 18 Jun 2020 17:59:09 -0400
Subject: [PATCH 1/4] Remove Haskell refs from final neuron drv

---
 default.nix | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index accc1f999..cbb6c84f2 100644
--- a/default.nix
+++ b/default.nix
@@ -1 +1,14 @@
-(import ./project.nix {}).ghc.neuron
+let 
+  ghc = (import ./project.nix {}).ghc;
+  neuron = ghc.neuron;
+in 
+  neuron.overrideDerivation (drv: {
+     disallowedReferences = [ ghc.pandoc ghc.pandoc-types ghc.shake ghc.warp ghc.HTTP ];
+     postInstall = ''
+      remove-references-to -t ${ghc.pandoc} $out/bin/neuron
+      remove-references-to -t ${ghc.pandoc-types} $out/bin/neuron
+      remove-references-to -t ${ghc.shake} $out/bin/neuron
+      remove-references-to -t ${ghc.warp} $out/bin/neuron
+      remove-references-to -t ${ghc.HTTP} $out/bin/neuron
+     '';
+  })

From 931288d06e6b9a9db14fad7536ca885b4547f0b6 Mon Sep 17 00:00:00 2001
From: Sridhar Ratnakumar <srid@srid.ca>
Date: Thu, 18 Jun 2020 18:34:21 -0400
Subject: [PATCH 2/4] Discard more references

---
 default.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index cbb6c84f2..e9cb8b8fc 100644
--- a/default.nix
+++ b/default.nix
@@ -3,12 +3,15 @@ let
   neuron = ghc.neuron;
 in 
   neuron.overrideDerivation (drv: {
-     disallowedReferences = [ ghc.pandoc ghc.pandoc-types ghc.shake ghc.warp ghc.HTTP ];
+     disallowedReferences = [ ghc.pandoc ghc.pandoc-types ghc.shake ghc.warp ghc.HTTP ghc.js-jquery ghc.js-dgtable ghc.js-flot ];
      postInstall = ''
       remove-references-to -t ${ghc.pandoc} $out/bin/neuron
       remove-references-to -t ${ghc.pandoc-types} $out/bin/neuron
       remove-references-to -t ${ghc.shake} $out/bin/neuron
       remove-references-to -t ${ghc.warp} $out/bin/neuron
       remove-references-to -t ${ghc.HTTP} $out/bin/neuron
+      remove-references-to -t ${ghc.js-jquery} $out/bin/neuron
+      remove-references-to -t ${ghc.js-dgtable} $out/bin/neuron
+      remove-references-to -t ${ghc.js-flot} $out/bin/neuron
      '';
   })

From 036b78cba428e13cb169bf5d7ef3b787e2dd8a78 Mon Sep 17 00:00:00 2001
From: Sridhar Ratnakumar <srid@srid.ca>
Date: Thu, 18 Jun 2020 18:40:15 -0400
Subject: [PATCH 3/4] Update ci.nix to reuse existing Nix files

---
 .gitignore | 1 +
 ci.nix     | 5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index da47f8fd8..1073eb824 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ dist
 dist-*
 .ghc.environment.*
 result
+result-2
 .shake
 .neuron
 neuron.prof
diff --git a/ci.nix b/ci.nix
index aa189d5bf..64b3f9343 100644
--- a/ci.nix
+++ b/ci.nix
@@ -1,11 +1,10 @@
 let
-  project = import ./project.nix { };
   pkgs = import <nixpkgs> { };
 in
 pkgs.recurseIntoAttrs {
   # Build both default.nix and shell.nix such that both derivations are
   # pushed to cachix. This allows the development workflow (bin/run, etc.) to
   # use cachix to full extent.
-  neuron = project.ghc.neuron;
-  neuronShell = project.shells.ghc;
+  neuron = import ./default.nix;
+  neuronShell = import ./shell.nix;
 }

From 93e4d04a6c5727a38ca98383f9196410f2833824 Mon Sep 17 00:00:00 2001
From: Sridhar Ratnakumar <srid@srid.ca>
Date: Thu, 18 Jun 2020 18:43:42 -0400
Subject: [PATCH 4/4] Add comments

---
 default.nix | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/default.nix b/default.nix
index e9cb8b8fc..feee52c96 100644
--- a/default.nix
+++ b/default.nix
@@ -3,8 +3,14 @@ let
   neuron = ghc.neuron;
 in 
   neuron.overrideDerivation (drv: {
-     disallowedReferences = [ ghc.pandoc ghc.pandoc-types ghc.shake ghc.warp ghc.HTTP ghc.js-jquery ghc.js-dgtable ghc.js-flot ];
-     postInstall = ''
+    # Avoid transitive runtime dependency on the whole GHC distribution due to
+    # Cabal's `Path_*` module thingy. For details, see:
+    # https://github.com/NixOS/nixpkgs/blob/46405e7952c4b41ca0ba9c670fe9a84e8a5b3554/pkgs/development/tools/pandoc/default.nix#L13-L28
+    #
+    # In order to keep this list up to date, use nix-store and why-depends as
+    # explained here: https://www.srid.ca/04b88e01.html
+    disallowedReferences = [ ghc.pandoc ghc.pandoc-types ghc.shake ghc.warp ghc.HTTP ghc.js-jquery ghc.js-dgtable ghc.js-flot ];
+    postInstall = ''
       remove-references-to -t ${ghc.pandoc} $out/bin/neuron
       remove-references-to -t ${ghc.pandoc-types} $out/bin/neuron
       remove-references-to -t ${ghc.shake} $out/bin/neuron
@@ -13,5 +19,5 @@ in
       remove-references-to -t ${ghc.js-jquery} $out/bin/neuron
       remove-references-to -t ${ghc.js-dgtable} $out/bin/neuron
       remove-references-to -t ${ghc.js-flot} $out/bin/neuron
-     '';
+    '';
   })