slack: use latestRelease API for update script

set -eou pipefail

latest_linux_version=$(curl -L --silent https://slack.com/downloads/linux | sed -n 's/.*Version \([0-9\.]\+\).*/\1/p')

latest_mac_version=$(curl -L --silent https://slack.com/downloads/mac | sed -n 's/.*Version \([0-9\.]\+\).*/\1/p')

latest_linux_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=x64&variant=deb')"

latest_mac_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=universal&variant=dmg')"

latest_mac_arm_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=arm64&variant=dmg')"

latest_linux_version="$(echo ${latest_linux_data} | jq -rc '.version')"

latest_mac_version="$(echo ${latest_mac_data} | jq -rc '.version')"

latest_mac_arm_version="$(echo ${latest_mac_arm_data} | jq -rc '.version')"

nixpkgs="$(git rev-parse --show-toplevel)"

slack_nix="$nixpkgs/pkgs/by-name/sl/slack/package.nix"

  exit 0

fi

linux_url="https://downloads.slack-edge.com/desktop-releases/linux/x64/${latest_linux_version}/slack-desktop-${latest_linux_version}-amd64.deb"

mac_url="https://downloads.slack-edge.com/desktop-releases/mac/universal/${latest_mac_version}/Slack-${latest_mac_version}-macOS.dmg"

mac_arm_url="https://downloads.slack-edge.com/desktop-releases/mac/arm64/${latest_mac_version}/Slack-${latest_mac_version}-macOS.dmg"

linux_url="$(echo ${latest_linux_data} | jq -rc '.download_url')"

mac_url="$(echo ${latest_mac_data} | jq -rc '.download_url')"

mac_arm_url="$(echo ${latest_mac_arm_data} | jq -rc '.download_url')"

linux_sha256=$(nix-prefetch-url ${linux_url})

mac_sha256=$(nix-prefetch-url ${mac_url})

mac_arm_sha256=$(nix-prefetch-url ${mac_arm_url})