C++ Runner

c++

#!/bin/bash

# A bash utility for quickly running a simple C++ file using:
# c++ my_file.cpp
#
# Features:
# * stderr output becomes red (use std::cerr or fprintf(stderr, ...) to debug).
# * Caches the compiled file based on the code content (if the file doesn't change,
#   it will run the same pre-compiled binary).
#
# Instructions:
# Save as ~/bin/c++ (add to path)
# Speed up compile time when using #include <bits/stdc++.h>
# https://codeforces.com/blog/entry/53909 (precompile the header using the same flags as below),
# note that the compilation can be done in the same folder as the original header (no need to create a copy).

color-stderr()(set -o pipefail;"$@" 2>&1>&3|sed $'s,.*,\e[31m&\e[m,'>&2)3>&1

if [ -z "$1" ]
then
  echo "File path missing" >&2
  exit 1
fi

BIN_TEMP_LIMIT_FILES=30
BIN_TEMP=".bin-tmp"
COMPILE_FLAGS="-pedantic -O2 -Wall  -Wextra -std=c++17"

FILES_IN_BIN_TEMP=$(ls $BIN_TEMP | wc -l)

# Clean temp folder if there are too many files
if [[ $FILES_IN_BIN_TEMP -ge $BIN_TEMP_LIMIT_FILES ]]; then
  rm $BIN_TEMP/*
fi

HASH=$(sha1sum $1 | cut -d ' ' -f 1)

OUT_FILE="./$BIN_TEMP/$HASH"

if [ ! -f $OUT_FILE ]
then
  mkdir -p $BIN_TEMP
  g++ $1 $COMPILE_FLAGS -o $OUT_FILE
fi

if [ $? -eq 0 ]; then
  time color-stderr $OUT_FILE
fi