pre-commit

#!/bin/bash
runValue=0
check="message"

# This function's main purpose is to search for a file or program and pr# int an error message if it is not found. The function takes in a file # or program as the parameter.
function exists()
{
	program=$1
	if [ hash "$program" >/dev/null 2>&1 ]; then
		echo >&2 "$program is not found. Please install to continue"
		exit 1 
	fi;
}

# This function receives the output number from the debugger implemented# and depending on whether it is 0 or not, it prints out the errors that# the debugger found in the committed code and sets the runValue to 1
function implementChecks()
{
	result=$1 
	errorMsg=$2
	if [ "$result" -ne "0" ] ; then 
		echo "$file: failed check"
		echo "$errorMsg"
		runValue=1
	fi;
}

# This function goes thrugh any shellscript file that has been committed# and uses the shellcheck debugger to find errors. It then prints out th# e errors found in the committed code and sets the runValue to 1
function verifyShellScripts()
{
	exists "shellcheck"
	file=$1
  	check=$(shellcheck "$file")
		implementChecks "$?" "$check" 
	return $runValue
}

# This function runs through any python file that has been committed and# uses the pylint debugger to find errors. Then, the errors are printed # and the runValue is set to 1
function verifyPythonScripts()
{
	exists "pylint"
	file=$1 
	check=$(pylint "$file")
		implementChecks "$?" "$check"
	return $runValue 
}

# This function acts the same way as the two functions in the sense that# it uses goimports to debug through a go program and fix whatever synta# x issues present. The difference is goimports will automatically corre# ct the errors found, thus committing code instantly.
function verifyGoScripts()
{
	exists "goimports" 
	file=$1
	goimports -w $file
}

# The for loop runs every file that is attempting to be committed on git# through their respective functions,dependent on the type of file it is
for i in $(git diff --cached --name-only --diff-filter=ACM); do
	input=${i:(-3)}
	if [ "$input" == ".sh" ] ; then 
		verifyShellScripts "$i"
	elif [ "$input" == ".py" ] ; then
		verifyPythonScripts "$i"
	elif [ "$input" == ".go" ] ; then
		verifyGoScripts "$i" 
	fi;
done

# At the end, if the runValue is equal to 1, then an error message, "Com# mit Failed", not committing the code to the repository
if [ "$runValue" -eq "1" ] ; then
	echo "Commit Failed"
	 exit 1
else
	 exit 0
fi;