Bash script to run golint in Docker and output warnings in checkstyle XML format

Checkstyle XML Golint Output

#!/bin/bash

# this script assumes you have an existing `MY_IMAGE` Docker image with your code in `$project_root`
# you will also need to update the `/path/to/my/project/` with your actual project path

# since golint doesn't ignore the vendor dir, you may want to add multiple `golint /path/...`
# lines to the `docker run` command to check the dirs with your project golang code

# the result is output to golint.xml

# accepts an input string of style errs and outputs XML
output_xml() {
  echo "<checkstyle>"
  if [[ ! -z "$1" ]]; then
    current_file=""

    # loop through each file with errors
    while IFS= read -r err_line; do
      file_and_line_length=$(expr index "$err_line" " ")-2
      file_and_line=${err_line:0:file_and_line_length}

      IFS=":" read -r -a file_data <<< "$file_and_line"
      file=${file_data[0]:$root_dir_length}
      line=${file_data[1]}

      error=${err_line:$file_and_line_length+2}

      if [ "$current_file" != "$file" ]; then
        if [[ ! -z "$current_file" ]]; then
          echo "  </file>"
        fi
        echo "  <file name=\"$file\">"
        current_file=$file
      fi

      echo "    <error line=\"$line\" message=\"$error\"></error>"
    done <<< "$1"

    echo "  </file>"
  fi
  echo "</checkstyle>"
}

project_root="/path/to/my/project/"
root_dir_length=${#project_root}

style_errs=$(docker run \
  --rm \
  MY_IMAGE \
  bash -c "
    go get -u golang.org/x/lint/golint
    golint /path/to/my/project/dir/...
  ")

output_xml "$style_errs" 2>&1 | tee ./golint.xml