From 1fb8d176c5fc381da777a39275211314a2ebe9a7 Mon Sep 17 00:00:00 2001
From: Basile Henry <bjm.henry@gmail.com>
Date: Sun, 26 Aug 2018 13:26:49 +0100
Subject: [PATCH 1/2] Add script to generate the elm-format nix derivation for
 nixpkgs

---
 package/nix/generate_derivation.sh | 50 ++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100755 package/nix/generate_derivation.sh

diff --git a/package/nix/generate_derivation.sh b/package/nix/generate_derivation.sh
new file mode 100755
index 000000000..e7853064d
--- /dev/null
+++ b/package/nix/generate_derivation.sh
@@ -0,0 +1,50 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p git haskellPackages.cabal2nix nix-prefetch-git jq
+
+# This script generates the nix derivation for elm-format intended for nixpkgs:
+# https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/compilers/elm/packages/elm-format.nix
+
+# To use this script, update the FLAVOR to the most recent flavor of elm-format
+# and then run:
+#
+# $ ./generate_derivation.sh > elm-format.sh
+#
+# This might take a bit of time if the dependencies are not already in the nix
+# store. If you already have all the dependencies installed, feel free to remove
+# them from the shebang to speed up the process.
+
+FLAVOR="0.19"
+
+REV="$(git rev-parse HEAD)"
+VERSION="$(git describe --abbrev=8)"
+ROOTDIR="$(git rev-parse --show-toplevel)"
+SHA="$(nix-prefetch-git --url "$ROOTDIR" --rev "$REV" --quiet --no-deepClone | jq .sha256)"
+
+PATCH=$(cat <<END
+  src = fetchgit {
+    url = "http://github.com/avh4/elm-format";
+    sha256 = $SHA;
+    rev = "$REV";
+  };
+
+  doHaddock = false;
+  jailbreak = true;
+  postInstall = ''
+    ln -s \$out/bin/elm-format-$FLAVOR \$out/bin/elm-format
+  '';
+  postPatch = ''
+    sed -i "s|desc <-.*||" ./Setup.hs
+    sed -i "s|gitDescribe = .*|gitDescribe = \\\\\\\\\"$VERSION\\\\\\\\\"\"|" ./Setup.hs
+  '';
+END
+)
+
+# quoteSubst from https://stackoverflow.com/a/29613573
+quoteSubst() {
+  IFS= read -d '' -r < <(sed -e ':a' -e '$!{N;ba' -e '}' -e 's/[&/\]/\\&/g; s/\n/\\&/g' <<<"$1")
+  printf %s "${REPLY%$'\n'}"
+}
+
+cabal2nix "$ROOTDIR" |
+  sed "s#^{ mkDerivation#{ mkDerivation, fetchgit#" |
+  sed "s#\\s*src = .*;#$(quoteSubst "$PATCH")#"

From ae0f3392b7fc245e689a547736b7703cd49dbdcb Mon Sep 17 00:00:00 2001
From: Aaron VonderHaar <gruen0aermel@gmail.com>
Date: Tue, 2 Oct 2018 18:02:58 -0700
Subject: [PATCH 2/2] Automate preparing the nix formula

---
 PUBLISHING.md                      | 10 ++++++++
 package/nix/.gitignore             |  1 +
 package/nix/build.sh               | 37 ++++++++++++++++++++++++++++++
 package/nix/generate_derivation.sh | 23 +++++++------------
 4 files changed, 56 insertions(+), 15 deletions(-)
 create mode 100644 package/nix/.gitignore
 create mode 100755 package/nix/build.sh

diff --git a/PUBLISHING.md b/PUBLISHING.md
index 36619501b..df80683ab 100644
--- a/PUBLISHING.md
+++ b/PUBLISHING.md
@@ -67,3 +67,13 @@ npm dist-tag add elm-format@<new version> elm0.18.0
 npm dist-tag add elm-format@<new version> elm0.19.0
 npm dist-tag add elm-format@<new version> exp
 ```
+
+
+## Nix
+
+```
+cd package/nix
+./build.sh
+```
+
+Then `cd nixpkgs`, push the resulting branch, and make a PR to https://github.com/NixOS/nixpkgs with the title "elm-format: [old version] -> [new version]"
diff --git a/package/nix/.gitignore b/package/nix/.gitignore
new file mode 100644
index 000000000..85104f126
--- /dev/null
+++ b/package/nix/.gitignore
@@ -0,0 +1 @@
+/nixpkgs
diff --git a/package/nix/build.sh b/package/nix/build.sh
new file mode 100755
index 000000000..9e252f7f7
--- /dev/null
+++ b/package/nix/build.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -exo pipefail
+
+ELM_FORMAT_VERSION="$(git describe --abbrev=8)"
+BRANCH="elm-format-$ELM_FORMAT_VERSION"
+
+if [ ! -d nixpkgs ]; then
+  git clone https://github.com/NixOS/nixpkgs.git nixpkgs
+fi
+
+pushd nixpkgs
+git fetch origin master
+if git branch | grep " ${BRANCH}$"; then
+  git checkout "$BRANCH"
+  git reset --hard origin/master
+else
+  git checkout -b "$BRANCH" origin/master
+fi
+popd
+
+cabal2nix --no-check cabal://indents-0.3.3 > nixpkgs/pkgs/development/compilers/elm/packages/indents.nix
+cabal2nix --no-check cabal://tasty-quickcheck-0.9.2 > nixpkgs/pkgs/development/compilers/elm/packages/tasty-quickcheck.nix
+./generate_derivation.sh > nixpkgs/pkgs/development/compilers/elm/packages/elm-format.nix
+
+pushd nixpkgs
+rm -f result
+nix-build -A elmPackages.elm-format
+git status
+result/bin/elm-format | head -n1
+popd
+
+set +x
+
+echo
+echo "Everything looks good!"
+echo "You will need to make a PR from the $BRANCH branch"
diff --git a/package/nix/generate_derivation.sh b/package/nix/generate_derivation.sh
index e7853064d..53efeaade 100755
--- a/package/nix/generate_derivation.sh
+++ b/package/nix/generate_derivation.sh
@@ -1,37 +1,30 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i bash -p git haskellPackages.cabal2nix nix-prefetch-git jq
+#! nix-shell -i bash -p git cabal2nix nix-prefetch-git jq
 
 # This script generates the nix derivation for elm-format intended for nixpkgs:
 # https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/compilers/elm/packages/elm-format.nix
 
-# To use this script, update the FLAVOR to the most recent flavor of elm-format
-# and then run:
+# To use this script, run:
 #
-# $ ./generate_derivation.sh > elm-format.sh
+# $ ./generate_derivation.sh > elm-format.nix
 #
 # This might take a bit of time if the dependencies are not already in the nix
 # store. If you already have all the dependencies installed, feel free to remove
 # them from the shebang to speed up the process.
 
-FLAVOR="0.19"
+set -exo pipefail
 
 REV="$(git rev-parse HEAD)"
-VERSION="$(git describe --abbrev=8)"
+VERSION="$(git describe --abbrev=8 "$REV")"
 ROOTDIR="$(git rev-parse --show-toplevel)"
-SHA="$(nix-prefetch-git --url "$ROOTDIR" --rev "$REV" --quiet --no-deepClone | jq .sha256)"
+SHA="$(nix-prefetch-git --url "$ROOTDIR" --rev "$REV" --quiet --no-deepClone | jq --raw-output .sha256)"
 
 PATCH=$(cat <<END
   src = fetchgit {
     url = "http://github.com/avh4/elm-format";
-    sha256 = $SHA;
+    sha256 = "$SHA";
     rev = "$REV";
   };
-
-  doHaddock = false;
-  jailbreak = true;
-  postInstall = ''
-    ln -s \$out/bin/elm-format-$FLAVOR \$out/bin/elm-format
-  '';
   postPatch = ''
     sed -i "s|desc <-.*||" ./Setup.hs
     sed -i "s|gitDescribe = .*|gitDescribe = \\\\\\\\\"$VERSION\\\\\\\\\"\"|" ./Setup.hs
@@ -45,6 +38,6 @@ quoteSubst() {
   printf %s "${REPLY%$'\n'}"
 }
 
-cabal2nix "$ROOTDIR" |
+cabal2nix --no-haddock "$ROOTDIR" |
   sed "s#^{ mkDerivation#{ mkDerivation, fetchgit#" |
   sed "s#\\s*src = .*;#$(quoteSubst "$PATCH")#"