How to Adhere to Drupal Coding Standards with Git Hooks

#!/bin/bash

# Redirect output to stderr.
exec 1>&2

# Color codes for the error message.
redclr=`tput setaf 1`
greenclr=`tput setaf 2`
blueclr=`tput setaf 4`
reset=`tput sgr0`

# Printing the notification in the display screen.
echo  "${blueclr}"
echo "................................. Validating your codes  ……..…………....."
echo "-----------------------------------------------------------${reset}"

# Mentioning the directories which should be excluded.
dir_exclude='\/kint\/|\/contrib\/|\/devel\/|\/libraries\/|\/vendor\/|\.info$|\.png$|\.gif$|\.jpg$|\.ico$|\.patch$|\.htaccess$|\.sh$|\.ttf$|\.woff$|\.eot$|\.svg$'

# Checking for the debugging keyword in the commiting code base.
keywords=(ddebug_backtrace debug_backtrace dpm print_r var_dump  dump console\.log)

keywords_for_grep=$(printf "|%s" "${keywords[@]}")
keywords_for_grep=${keywords_for_grep:1}

# Flags for the counter.
synatx_error_found=0
debugging_function_found=0
merge_conflict=0
coding_standard_error=0


# Checking for PHP syntax errors.
changed_files=`git diff-index --diff-filter=ACMRT --cached --name-only HEAD -- | egrep '\.theme$|\.module$|\.inc|\.php$'`
if [ -n "$changed_files" ]
then
 for FILE in $changed_files; do
 php -l $FILE > /dev/null 2>&1
 compiler_result=$?
 if [ $compiler_result -eq 255 ]
 then
   if [ $synatx_error_found -eq 0 ]
   then
     echo "${redclr}"
     echo "# Compilation error(s):"
     echo "=========================${reset}"
   fi
   synatx_error_found=1
   `php -l $FILE > /dev/null`
 fi
 done
fi

# Checking for debugging functions.
files_changed=`git diff-index --diff-filter=ACMRT --cached --name-only HEAD -- | egrep -v $dir_exclude`
if [ -n "$files_changed" ]
then
 for FILE in $files_changed ; do
   for keyword in "${keywords[@]}" ; do

     pattern="^\+(.*)?$keyword(.*)?"
     resulted_files=`git diff --cached $FILE | egrep -x "$pattern"`
     if [ ! -z "$resulted_files" ]
     then
       if [ $debugging_function_found -eq 0 ]
       then
         echo "${redclr}"
         echo "Validating keywords"
         echo "================================================${reset}"
       fi
       debugging_function_found=1
       echo "Debugging function" $keyword
       git grep -n $keyword $FILE | awk '{split($0,a,":");
         printf "\found in " a[1] " in line " a[2] "\n";
       }'
     fi
   done
 done
fi

# Checking for Drupal coding standards
changed_files=`git diff-index --diff-filter=ACMRT --cached --name-only HEAD -- | egrep -v $dir_exclude | egrep '\.php$|\.module$|\.inc$|\.install$|\.test$|\.profile$|\.theme$|\.js$|\.css$|\.info$|\.txt$|\.yml$'`
if [ -n "$changed_files" ]
then
   phpcs_result=`phpcs --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml --report=csv $changed_files`
 if [ "$phpcs_result" != "File,Line,Column,Type,Message,Source,Severity,Fixable" ]
 then
   echo "${redclr}"
   echo "# Hey Buddy, The hook found some issue(s)."
   echo "---------------------------------------------------------------------------------------------${reset}"
   phpcs --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml $changed_files
   echo "<=======> Run below command to fix the issue(s)"
   echo "# phpcbf --standard=Drupal --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml your_custom_module_or_file_path"
   echo “<====================================================>"
   echo "# To skip the Drupal Coding standard issue(s), Please use this commands << git commit -m your commit Message --no-verify >>"
   echo "-----------------------------------------------------------------------------------------------------------------------------------------${reset}"
   coding_standard_error=1
 fi
fi

# Checking for merge conflict markers.
files_changed=`git diff-index --diff-filter=ACMRT --cached --name-only HEAD --`
if [ -n "$files_changed" ]
then
 for FILE in $files_changed; do

   pattern="(<<<<|====|>>>>)+.*(\n)?"
   resulted_files=`egrep -in "$pattern" $FILE`
   if [ ! -z "$resulted_files" ]
   then
     if [ $merge_conflict -eq 0 ]
     then
       echo "${redclr}"
       echo "-----------------------Unable to commit the file(s):------------------------"
       echo "-----------------------------------${reset}"
     fi
     merge_conflict=1
     echo $FILE
   fi
 done
fi

# Printing final result
errors_found=$((synatx_error_found+debugging_function_found+merge_conflict+coding_standard_error))
if [ $errors_found -eq 0 ]
then
 echo "${greenclr}"
 echo "Wow! It is clean code"
 echo "${reset}"
else
 echo "${redclr}"
 echo "Please Correct the errors mentioned above. We are aborting your commit."
 echo "${reset}"
 exit 1
fi