# Three ways of checking if a file exists in a shell script

FILE=/etc/resolv.conf

if test -f "$FILE"; then
    echo "$FILE exists."
fi

if [ -f "$FILE" ]; then
    echo "$FILE exists."
fi

if [[ -f "$FILE" ]]; then
    echo "$FILE exists."
fi

for region in `aws ec2 describe-regions --output text | cut -f4`
do
     echo -e "\nListing Instances in region:'$region'..."
     aws ec2 describe-instances --query 'Reservations[*].Instances[*].{Instance:InstanceId,Subnet:SubnetId}' --region $region
done
#This script is to be used with any AWS CLI configured environment, it will list any EC2 instances and their associated subnet network ID's in JSON format

#!/bin/bash
#Takes command line arguments and pulls the header files.
#Good for checking if the function you want is in the header or not.
#cppToStdout.sh "time.h"
while [ "$1" != "" ]; do
	echo "#include<$1>" | g++ -x c++ -E -
	shift
done

name="John"
echo ${name}
echo ${name/J/j}    #=> "john" (substitution)
echo ${name:0:2}    #=> "Jo" (slicing)
echo ${name::2}     #=> "Jo" (slicing)
echo ${name::-1}    #=> "Joh" (slicing)
echo ${name:(-1)}   #=> "n" (slicing from right)
echo ${name:(-2):1} #=> "h" (slicing from right)
echo ${food:-Cake}  #=> $food or "Cake"

#!/bin/bash
#Installs the Vulkan library and other goodies. Works on Arch and Arch based distros. Needs pacman and makepkg
installVulkan(){
	#Tries installing every linux package in existence
	packages=( vulkan-tools libvulkan-dev vulkan-loader-devel vulkan-validation-layers spirv-tools mesa-vulkan-devel vulkan-validation-layers-devel )
	for package in ${packages[*]}; do
	sudo pacman --noconfirm -S $package
	done
}
installLibraries(){
	#All of these packages don't exist, so we have to download and install the AUR packages
	#packages=( libglfw3-dev glfw-devel libglm glm-devel )
	#for package in ${packages[*]}; do
	# sudo pacman --noconfirm -S $package
	#done
	sudo git clone https://aur.archlinux.org/glfw-git.git /tmp/glfw-git
	sudo chmod 777 /tmp/glfw-git
	cd /tmp/glfw-git
	makepkg -si

	sudo git clone https://aur.archlinux.org/glm-git.git /tmp/glm-git
	sudo chmod 777 /tmp/glm-git
	cd /tmp/glm-git
	makepkg -si
}
installShaderCompiler(){
	#Basically installs glslc
	sudo pacman -S shaderc
}
while true; do
	select bruh in installVulkan installLibraries installShaderCompiler "exit"; do
	$bruh
	done
done

#!/bin/bash
#makefileMaker.sh by Leif Messinger
#Needs getDependencies.sh

CC="gcc"
#I have no idea why it's called CXX when it's a c++ compiler
#I know that cpp is c pre processor, but still, why X?
CXX="g++"

CXXFLAGS="-std=c++17 -O2"
#CFLAGS="-std=c17"
LIBRARIES="$@"
#Vulkan Flags for me
#LIBRARIES="-lglfw -lvulkan -ldl -lpthread -lX11 -lXxf86vm -lXrandr -lXi"

function compileAllFiles(){
	#output: bruh.o yeet.o
	#	CXX $CXXFLAGS bruh.o yeet.o -o output $LIBRARIES
	echo -n "output:"
	if compgen -G "*.cpp" &> /dev/null; then
		for f in *.cpp; do
			echo -n " ${f%.cpp}.o"
		done
	fi
	if compgen -G "*.c" &> /dev/null; then
		for f in *.c; do
			echo -n " ${f%.c}.o"
		done
	fi
	echo ""

	if compgen -G "*.cpp" &> /dev/null; then
		echo -e -n "\t$CXX $CXXFLAGS "
	else
		echo -e -n "\t$CC $CFLAGS "
	fi
	if compgen -G "*.cpp" &> /dev/null; then
		for f in *.cpp; do
			echo -n " ${f%.cpp}.o"
		done
	fi
	if compgen -G "*.c" &> /dev/null; then
		for f in *.c; do
			echo -n " ${f%.c}.o"
		done
	fi
	echo " -o output $LIBRARIES"
	echo ""
}

function compileAllObjectFiles(){
	#bruh.o: bruh.cpp yeet.h
	#	CXX $CXXFLAGS -c bruh.cpp $LIBRARIES
	if compgen -G "*.cpp" &> /dev/null; then
		for f in *.cpp; do
			echo -n "${f%.cpp}.o: $f"
			getDependencies.sh < $f
			echo ""

			echo -e "\t$CXX $CXXFLAGS -c $f"
			echo ""
		done
	fi
	#yeet.o: yeet.c
	#	CC $CFLAGS -c yeet.c $LIBRARIES
	if compgen -G "*.c" &> /dev/null; then
		for f in *.c; do
			echo -n "${f%.c}.o: $f"
			getDependencies.sh < $f
			echo ""

			echo -e "\t$CC $CFLAGS -c $f"
			echo ""
		done
	fi
}

compileAllFiles

compileAllObjectFiles

#does not work on windows
echo "clean:"
echo -e "\trm -f -v *.o output"
echo ""

echo "run:"
echo -e "\t./output"
echo ""

echo "debug:"
if compgen -G "*.cpp" &> /dev/null; then
	echo -e -n "\t$CXX $CXXFLAGS -g "
else
	echo -e -n "\t$CC $CFLAGS -g "
fi
if compgen -G "*.cpp" &> /dev/null; then
	for f in *.cpp; do
		echo -n " ${f}"
	done
fi
if compgen -G "*.c" &> /dev/null; then
	for f in *.c; do
		echo -n " ${f}"
	done
fi
echo " $LIBRARIES -o output"
echo ""