pre-receive hooks for eslint and stylelint

lint.sh

#! /bin/bash
date_start=$(date +%s)
# colors const

red='\033[1;31m' # error
green='\033[1;32m' # success
yellow='\033[1;33m' # warning
cyan='\033[1;36m' # info
no_color='\033[0m' # No Color
# console func
console_info(){
  echo -e "${cyan} [INFO] $1 ${no_color}"
}
console_error(){
  echo -e "${red} [ERROR] $1 ${no_color}"
}
console_success(){
  echo -e "${green} [SUCCESS] $1 ${no_color}"
}
console_warning(){
  echo -e "${yellow} [WARNING] $1 ${no_color}"
}

# business func
is_not_linting_branch(){
  local branches=("master" "dev" "test" "beta" "staging")
  local arr='[ "master", "dev", "test", "beta", "staging" ]'
  echo "${branches[@]:0}" | grep -o $1 > /dev/null 2>&1
  if [[ $? -eq 0 ]]; then
    console_info "branch $1 matches in ${arr}."
    return 1
  else
    console_info "branch $1 no matches in ${arr}."
    return 0
  fi
}
no_need_linting(){
  git log -1 --pretty=format:%B $1 | grep no_checkstyle > /dev/null
  if [ $? -eq 0 ]; then
    console_warning "Commit msg contains \" no_checkstyle \". Accept this push directly."
    return 0
  fi
  return 1
}
copy_file_from_git(){
  local source_file=$1
  local target_dir=$2
  local new_sha1=$3
  if [[ -e ${target_dir}/${source_file} ]]; then
    console_error "File ${source_file} exists in the temp directory."
    console_error "It may cause by the reason that you push multiply modified branch."
    console_error "Please split your push into separate operations."
    rm -rf ${target_dir}
    exit 1
  fi
  git show ${new_sha1}:${source_file} > ${target_dir}/${source_file} 2> /dev/null
  if [[ $? -eq 0 ]]; then
    console_info "Copy \"${source_file}\" to ${target_dir}."
  else
    console_error "Can not find needed file named ${source_file}! Reject this push!"
    rm -rf ${target_dir}
    exit 1
  fi
}
lint_modified_files(){
  console_info "Linting for the $1 files..."
  npm run "pre-receive:$1"
  return $?
}
# variables
temp_dir=$(mktemp -d /tmp/code_lint_tmp_XXXXX)
oldrev=$1
newrev=$2
refname=$3
null_commit=$(printf '0%.0s' {1..40})
lint_branches=0
js_result_status=1 # may use three variables in the future
scss_result_status=1
status=1

while read oldrev newrev refname; do
  branch=${refname#refs/heads/}
  console_info "###################   Branch  [${branch}]  ###################"
  console_info "oldrev: $oldrev."
  console_info "newrev: $newrev."
  console_info "refname: $refname."
  console_info "branch: ${branch}"
  if is_not_linting_branch ${branch}; then
    continue; # skip linting when the branch is no matching
  fi
  if [[ $newrev = ${null_commit} ]]; then
    console_warning "Delete the branch named $refname.No need linting."
    continue; # skip linting when the branch is deleted
  fi
  if no_need_linting $newrev; then
    console_warning "no_need_linting"
    continue; # skip linting when commit msg contains "no_checkstyle"
  fi

  if [[ $oldrev = ${null_commit} ]]; then
    console_warning "Create a branch named ${branch}." # new branch created
    oldrev=HEAD
  fi

  lint_branches=$[ lint_branches+1 ]
  console_info "lint_branches: ${lint_branches}"
  # get the needed files and check if it exists
  copy_file_from_git ".eslintrc" ${temp_dir} $newrev
  copy_file_from_git ".stylelintrc" ${temp_dir} $newrev
  copy_file_from_git "package.json" ${temp_dir} $newrev
  copy_file_from_git ".npmrc" ${temp_dir} $newrev
  # get the files that have been modified
  files=`git diff --name-only ${oldrev}..${newrev}`
  for file in $files; do
    # create all the necessary sub directories in the new temp directory
    mkdir -p "${temp_dir}/`dirname ${file}`"
    # and output the object content of newrev into it's original file name
    git show $newrev:$file 1> ${temp_dir}/$file 2> /dev/null
  done
done

  if [[ ${lint_branches} -eq 0 ]]; then
    console_info "There is no needed linting branch. Accept this push directly."
    rm -rf ${temp_dir}
    exit 0
  fi

if type node >/dev/null 2>&1; then
  console_info "Node.js has installed.Skip installing."
  else
    console_warning "Cannot found Node.js. Now install nvm and node."
    curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.1/install.sh | bash
    source ~/.nvm/nvm.sh && nvm install 8.9 && nvm use 8.9
    if [[ $? -ne 0 ]]; then
      console_error "There is something wrong when installing nvm and node."
    fi
fi
console_info "Node version: `node -v`"
console_info "Installing only devDependencies in package.json file..."
cd ${temp_dir} && npm install --only=dev
status=$?
lint_modified_files js
js_result_status=$?
lint_modified_files scss
scss_result_status=$?

# all the status
console_info "status: $status"
console_info "js_result_status: ${js_result_status}"
console_info "scss_result_status: ${scss_result_status}"
rm -rf ${temp_dir}
date_end=$(date +%s)
console_success "Costs $((date_end-date_start)) seconds"
exit $[ js_result_status+scss_result_status+status ]