setup-nerd-font

#!/usr/bin/env bash

set -euo pipefail

declare -r NERD_FONTS_DIR="${HOME}/.fonts/nerd-fonts"

mkdir -p "${NERD_FONTS_DIR}"

declare -A NERD_FONTS=()

declare font=""

_get_font_list() {
  local api_url="https://api.github.com/repos/ryanoasis/nerd-fonts/releases/latest"
  local urls

  IFS=$'\n' read -r -d '' -a urls \
    < <(set -o pipefail; curl -sf "${api_url}" | jq -r --arg pattern ".zip" '.assets | map(.browser_download_url) | map(select(. | test($pattern))) | .[]' && printf '\0')

  local _font
  for url in "${urls[@]}"; do
    _font=${url##*/}
    _font=${_font/.zip/}
    NERD_FONTS["${_font}"]="${url}"
  done
}

_select_font() {
  PS3='Select Font: '
  select _font in "${!NERD_FONTS[@]}"; do
    if [[ -n "${_font}" ]]; then
      if [[ -n "${NERD_FONTS[${_font}]}" ]]; then
        font="${_font}"
        break
      fi
    fi
  done
}

_download_font() {
  cd "${NERD_FONTS_DIR}"

  echo "Downloading font: ${font}"
  local -r url="${NERD_FONTS[${font}]}"
  wget --quiet --show-progress "${url}" -O "./${font}.zip"

  echo "Extracting archive..."
  unzip -o -q "./${font}.zip" -d "${font}"
}

_checkout_font() {
  local -r temp_dir="$(mktemp --directory /tmp/nerd-fonts--XXXXXXXXX)"

  echo "Checking-out font: ${font}"
  git clone --filter=blob:none --sparse https://github.com/ryanoasis/nerd-fonts.git "${temp_dir}"
  pushd "${temp_dir}" >/dev/null
  git sparse-checkout add "patched-fonts/${font}"
  popd >/dev/null

  echo "Copying files..."
  mkdir -p "${NERD_FONTS_DIR}/${font}"
  find "${temp_dir}/patched-fonts/${font}" -type f -iname "*.ttf" -exec cp {} "${NERD_FONTS_DIR}/${font}/" \;
  rm -rf "${temp_dir}"
}

_update_font_cache() {
  echo "Updating font cache..."
  sudo fc-cache -f
}

_git_supports_sparse_checkout() {
  local version="$(git --version)"
  version="${version##git version }"
  local major="${version%%.*}"
  local minor="${version/${major}./}"
  minor="${minor%%.*}"
  local patch="${version/${major}.${minor}./}"

  if [[ $major -lt 2 ]]; then
    return 1
  fi

  if [[ $minor -lt 26 ]]; then
    return 1
  fi

  return 0
}

_get_font_list
_select_font

if _git_supports_sparse_checkout; then
  _checkout_font
else
  _download_font
fi

_update_font_cache

echo "Done!"