Basic cabal install

readme.md

Install cabal binary:

wget -qO- https://gist.githubusercontent.com/joehand/24f15a88c13dc628fd3dc459d9810429/raw/f02b5278a15a3fa2ce834e4647f78a4a8f45f957/install-cabal.sh | bash

install-cabal.sh

#!/bin/bash

# gets latest cabal release zip for platform and extracts runnable binary into ~/.cabal
# usage: wget -qO- https://raw.githubusercontent.com/cabal-club/cabal-cli/master/bin/install.sh | bash
# based on https://github.com/jpillora/installer/blob/master/scripts/download.sh

CABAL_DIR="$HOME/.cabal/releases"

function cleanup {
	rm -rf $CABAL_DIR/tmp.zip > /dev/null
}

function fail {
	cleanup
	msg=$1
	echo "============"
	echo "Error: $msg" 1>&2
	exit 1
}

function install {
  # bash check
  [ ! "$BASH_VERSION" ] && fail "Please use bash instead"
	GET=""
	if which curl > /dev/null; then
		GET="curl"
		GET="$GET --fail -# -L"
	elif which wget > /dev/null; then
		GET="wget"
		GET="$GET -qO-"
	else
		fail "neither wget/curl are installed"
	fi
  case `uname -s` in
  Darwin) OS="macos";;
  Linux) OS="linux";;
  *) fail "unsupported os: $(uname -s)";;
  esac
  if uname -m | grep 64 > /dev/null; then
  	ARCH="x64"
  else
  	fail "only arch x64 is currently supported for single file install. please use npm instead. your arch is: $(uname -m)"
  fi
  echo "Fetching latest Cabal release version from GitHub"
  LATEST=$($GET -qs https://api.github.com/repos/cabal-club/cabal-cli/releases/latest | grep tag_name | head -n 1 | cut -d '"' -f 4);
	mkdir -p $CABAL_DIR || fail "Could not create directory $CABAL_DIR, try manually downloading zip and extracting instead."
	cd $CABAL_DIR
  RELEASE="cabal-${LATEST:1}-${OS}-${ARCH}"
  URL="https://github.com/cabal-club/cabal-cli/releases/download/${LATEST}/${RELEASE}.zip"
	which unzip > /dev/null || fail "unzip is not installed"
  echo "Downloading $URL"
	bash -c "$GET $URL" > $CABAL_DIR/tmp.zip || fail "download failed"
	unzip -o -qq $CABAL_DIR/tmp.zip || fail "unzip failed"
  BIN="$CABAL_DIR/$RELEASE/cabal"
	chmod +x $BIN || fail "chmod +x failed"
	cleanup
  printf "Cabal $LATEST has been downloaded successfully. Execute it with this command:\n\n${BIN}\n\nAdd it to your PATH with this command (add this to .bash_profile/.bashrc):\n\nexport PATH=\"\$PATH:$CABAL_DIR/$RELEASE\"\n"
}

install

Questions I have:

• Is ~/.cabal/releases the best place to install?
• Can we make that exit message nicer?
• What if the latest release isn't published? (this happened in Dat because we released a new one but the binary didn't get built b/c tests failed causing this script to break)
• Should we prefer this distribution to npm? (e.g. zeit/now installs the binary when you do npm install)