Freeze cabal and index state

cabal.project

@@ -1,3 +1,5 @@
 packages: ./ghup.cabal
 
 with-compiler: ghc-8.6.5
+
+index-state: 2020-01-31T21:11:24Z

cabal.project.freeze

@@ -54,6 +54,7 @@ constraints: any.Cabal ==3.0.0.0,
              any.cryptonite ==0.26,
              cryptonite -check_alignment +integer-gmp -old_toolchain_inliner +support_aesni +support_deepseq -support_pclmuldq +support_rdrand -support_sse,
              any.data-default-class ==0.1.2.0,
+             any.data-default-instances-base ==0.1.0.1,
              any.dates ==0.2.3.0,
              any.deepseq ==1.4.4.0,
              any.deepseq-generics ==0.2.0.0,
@@ -134,6 +135,7 @@ constraints: any.Cabal ==3.0.0.0,
              streamly -benchmark -debug -dev -examples -examples-sdl -has-llvm -inspection -no-charts -no-fusion -streamk,
              any.streamly-bytestring ==0.1.0.1,
              any.syb ==0.7.1,
+             any.table-layout ==0.8.0.5,
              any.tagged ==0.8.6,
              tagged +deepseq +transformers,
              any.template-haskell ==2.14.0.0,

update-index-state.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+set -eu
+
+status_message() {
+    printf "\\033[0;32m%s\\033[0m\\n" "$1"
+}
+
+error_message() {
+    printf "\\033[0;31m%s\\033[0m\\n" "$1"
+}
+
+SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
+CACHE_LOCATION="${HOME}/.cabal/packages/hackage.haskell.org/01-index.cache"
+
+if [ ! -f "${CACHE_LOCATION}" ] ; then
+	error_message "${CACHE_LOCATION} does not exist, did you run 'cabal update'?"
+	exit 1
+fi
+
+if [ ! -f "${SCRIPTPATH}/cabal.project" ] ; then
+	error_message "Could not find ${SCRIPTPATH}/cabal.project, skipping index state update."
+	exit 3
+fi
+
+cabal v2-update
+
+arch=$(getconf LONG_BIT)
+
+case "${arch}" in
+32)
+	byte_size=4
+	magic_word="CABA1002"
+    ;;
+64)
+	byte_size=8
+	magic_word="00000000CABA1002"
+    ;;
+*)
+	error_message "Unknown architecture (long bit): ${arch}"
+	exit 2
+    ;;
+esac
+
+# This is the logic to parse the binary format of 01-index.cache.
+# The first word is a magic 'caba1002', the second one is the timestamp in unix epoch.
+# Better than copying the cabal-install source code.
+if [ "$(xxd -u -p -l${byte_size} -s 0 "${CACHE_LOCATION}")" != "${magic_word}" ] ; then
+	error_message "Magic word does not match!"
+	exit 4
+fi
+cache_timestamp=$(echo "ibase=16;obase=A;$(xxd -u -p -l${byte_size} -s ${byte_size} "${CACHE_LOCATION}")" | bc)
+
+# If we got junk from the binary file, this should fail.
+cache_date=$(date --utc --date "@${cache_timestamp}" "+%FT%TZ")
+
+
+status_message "Updating index state in ${SCRIPTPATH}/cabal.project"
+
+if grep -q "^index-state: .*" "${SCRIPTPATH}/cabal.project" ; then
+	awk '/index-state:/ {gsub(/.*/, "index-state: '${cache_date}'")}; { print }' "${SCRIPTPATH}/cabal.project" > "${SCRIPTPATH}/cabal.project.tmp"
+	mv "${SCRIPTPATH}/cabal.project.tmp" "${SCRIPTPATH}/cabal.project"
+else
+	printf "index-state: %s\n" "${cache_date}" >> "${SCRIPTPATH}/cabal.project"
+fi
+