shell-linters

#!/usr/bin/env bash
# This installs shellcheck and shfmt linters into your computer.
# This script is shellcheck and "shfmt -i 2" compliant ;-)
# Copyright (C) 2018 Saichovsky. All rights reserved

ARCH=$(uname -m)
if [[ $ARCH =~ .*386.* ]]; then
  ARCH=386
elif [[ $ARCH == x86_64 ]]; then
  ARCH=amd64
else
  echo "I only support 386 and amd64 platforms. Feel free to extend. Will exit now."
  exit 4
fi

what_os() {
  echo "Please use a more decent OS." >&2
  exit 1
}

download() {
  FNAME=$(echo "$1" | awk -F '/' '{print $NF}')
  if command -v curl >/dev/null; then
    curl -skLo "$FNAME" "$1" || (
      echo "Failed to download $FNAME"
      exit 2
    )
  elif command -v wget >/dev/null; then
    wget -q -O "$FNAME" "$1" || (
      echo "Failed to download $FNAME"
      exit 2
    )
  else
    echo "Couldn't find a suitable HTTP client"
    exit 2
  fi
}

get_shfmt() {
  CMD=
  command -v curl >/dev/null && CMD="curl -sL" || CMD="wget -q -O -"
  BINPATH=$($CMD "$1" | grep -oE '/mvdan/.*linux_'${ARCH} | head -1)
  RV=$?

  [ $RV -eq 0 ] || (
    echo "Failed to retrieve the shfmt URL"
    exit 3
  )
  (download "https://github.com/${BINPATH}" &&
    sudo install -m 0755 -o 0 -g 0 shfmt_v* /usr/bin/shfmt && rm -f shfmt_v* &&
    echo "Installed shfmt successfully") ||
    (
      echo "Error downloading shfmt."
      exit 3
    )
}

# Install shfmt and shellcheck
printf 'Please wait while I install some dependencies... \n'
if [ "$(uname)" = "Darwin" ]; then
  command -v shfmt >/dev/null || brew install shfmt
  command -v shellcheck >/dev/null || brew install shellcheck
  echo "Done!"
elif [ "$(uname)" = "Linux" ]; then
  pushd /tmp || true
  # Install shellcheck
  if ! command -v shellcheck >/dev/null; then
    download "https://storage.googleapis.com/shellcheck/shellcheck-stable.linux.x86_64.tar.xz"
    tar -Jxvf shellcheck-stable.linux.x86_64.tar.xz >/dev/null 2>&1
    sudo cp shellcheck-stable/shellcheck /usr/bin/ && rm -fr shellcheck-stable* &&
      echo "Install shellcheck successfully"
  fi
  # Install shfmt
  if ! command -v shfmt >/dev/null; then
    get_shfmt "https://github.com/mvdan/sh/releases/latest/"
  fi
  popd >/dev/null || true
  echo "Done!"
else
  what_os
fi