latest-stable

#!/usr/bin/env bash

version_gte_api_change() {
  # Split the versions by dot character into arrays
  IFS='.' read -r -a input_version_array <<<"$1"
  IFS='.' read -r -a api_change_version_array <<<"0.16.0"

  # Support for 3 numbers in semantic versioning
  for i in {0..2}; do
    # suport for shorter versions by padding with 0
    [[ -z ${input_version_array[i]} ]] && input_version_array[i]=0

    if ((input_version_array[i] > api_change_version_array[i])); then
      # input version is higher
      return 0
    elif ((input_version_array[i] < api_change_version_array[i])); then
      # input version is lower
      return 1
    fi
    # else next loop
  done

  # versions are equal
  return 0
}

# get the directory of the current script
ASDF_ELIXIR_SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# calling a script to list all elixir releases
# reject releases before 1.0.0 (starting with 0)
# reject main and master branches
# reject releases with otp version
# reject release candidates
# reject empty line
# finally take last one
ASDF_ELIXIR_LATEST_VERSION=$("$ASDF_ELIXIR_SCRIPT_DIR"/list-all | tr " " "\n" | grep -Ev "^0|^main|^master|otp|rc|^$" | tail -n 1)

# support for v-dev and different asdf API versions
ASDF_ELIXIR_ASDF_VERSION="$(asdf version)"
if [ "$ASDF_ELIXIR_ASDF_VERSION" = "v-dev" ] || version_gte_api_change "${ASDF_ELIXIR_ASDF_VERSION#v}"; then
  # use --no-header flag only in latest asdf API (go builds)
  ASDF_ELIXIR_LATEST_OTP=$(asdf current --no-header erlang)
else
  ASDF_ELIXIR_LATEST_OTP=$(asdf current erlang)
fi

# Note: asdf latest does not allows latest stable version to start with number
#       therefore installing from source by git ref is not supported, see:
#       https://github.com/asdf-vm/asdf/blob/v0.16.5/internal/versions/versions.go#L276
printf "%s-otp-%s\n" "$ASDF_ELIXIR_LATEST_VERSION" "$(printf "%s" "$ASDF_ELIXIR_LATEST_OTP" | tr -s " ." "\n" | sed -n 2p)"