pass thru, but color some words and cut some lines

prepipe.cpp

#include <iostream>
#include <vector>
#include <cstdio>
using namespace std;

#define EACH(it, cont)	for (auto &it: cont)

#define TermReset		"\e[0m"
#define TermBlack		"\e[0;30m"
#define TermRed			"\e[0;31m"
#define TermGreen		"\e[0;32m"
#define TermYellow		"\e[0;33m"
#define TermBlue		"\e[0;34m"
#define TermPurple		"\e[0;35m"
#define TermBrown		"\e[0;36m"
#define TermLightGray	"\e[0;37m"
#define TermDarkGray	"\e[0;90m"
#define TermPink		"\e[0;91m"
#define TermLightGreen	"\e[0;92m"
#define TermTan			"\e[0;93m"
#define TermLightBlue	"\e[0;94m"
#define TermCyan		"\e[0;95m"
#define TermOrange		"\e[0;96m"
#define TermWhite		"\e[0;97m"

const char *letterToColor[256];
void init_colors() {
	letterToColor['r'] =  TermRed;
	letterToColor['R'] =  TermPink;
	letterToColor['g'] =  TermGreen;
	letterToColor['G'] =  TermLightGreen;
	letterToColor['y'] =  TermYellow;
	letterToColor['Y'] =  TermTan;
	letterToColor['t'] =  TermTan;
	letterToColor['b'] =  TermBlue;
	letterToColor['B'] =  TermLightBlue;
	letterToColor['p'] =  TermPurple;
	letterToColor['m'] =  TermPurple;
	letterToColor[ 0 ] =  TermCyan;
	letterToColor['P'] =  TermCyan;
	letterToColor['c'] =  TermCyan;
	letterToColor['a'] =  TermOrange;
	letterToColor['o'] =  TermOrange;
	letterToColor['O'] =  TermBrown;
	letterToColor['A'] =  TermBrown;
	letterToColor['s'] =  TermLightGray;
	letterToColor['S'] =  TermDarkGray;
}

bool starts_with(const string &s, const string &small) {
	return s.size() >=  small.size()
		&& s.compare(0, small.size(), small) == 0;
}

int main(int argc, char **argv) {
	init_colors();
	vector<pair<string, string>> toColorize, toCut;
	string colorTo = TermCyan;
	for (int i = 1; i < argc; ++i) {
		string arg = argv[i];
		if (starts_with(arg, "-c")) {
			colorTo = letterToColor[argv[i][2]];
		} else if (starts_with(arg, "-x")) {
			if (i + 2 >= argc) {
				cerr << "too small number of args for -x\n";
				return -1;
			}
			toCut.push_back(make_pair(argv[i+1], argv[i+2]));
			i += 2;
		} else {
			toColorize.push_back(make_pair(arg, colorTo));
		}
	}

	string line, cutUntil;
	while (getline(cin, line)) {
		if (line.empty()) {
			cout << '\n';
			continue;
		}
		if (!cutUntil.empty()) {
			if (line.find(cutUntil) == string::npos) {
				continue;
			}
			cout << "--- cut end ---\n";
			cutUntil = "";
		}
		char colorAtBeg[32] = TermReset;
		sscanf(line.c_str(), "%[\e[0;0-90-9m]", colorAtBeg);
		string endBy = colorAtBeg;
		EACH (k, toColorize) {
			string replaceBy = k.second + k.first + endBy;
			for (size_t i = 0; (i = line.find(k.first, i)) != string::npos; i += replaceBy.size()) {
				line.replace(i, k.first.size(), replaceBy);
			}
		}
		cout << line << '\n';
		EACH (k, toCut) {
			if (line.find(k.first) != string::npos) {
				cutUntil = k.second;
				cout << "--- cut, until '" << cutUntil << "' ---\n";
				break;
			}
		}
	}
	return 0;
}