path: root/src/btop_tools.cpp

/* Copyright 2021 Aristocratos (jakob@qvantnet.com)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

	   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

indent = tab
tab-size = 4
*/

#include <cmath>
#include <iostream>
#include <fstream>
#include <chrono>
#include <ctime>
#include <sstream>
#include <iomanip>
#include <utility>
#include <robin_hood.h>
#include <thread>

#include <unistd.h>
#include <termios.h>
#include <sys/ioctl.h>

#include <btop_tools.h>

using 	std::string_view, std::array, std::regex, std::max, std::to_string, std::cin,
		std::atomic, robin_hood::unordered_flat_map;
namespace fs = std::filesystem;
namespace rng = std::ranges;

//? ------------------------------------------------- NAMESPACES ------------------------------------------------------

//* Collection of escape codes for text style and formatting
namespace Fx {
	const string e = "\x1b[";
	const string b = e + "1m";
	const string ub = e + "22m";
	const string d = e + "2m";
	const string ud = e + "22m";
	const string i = e + "3m";
	const string ui = e + "23m";
	const string ul = e + "4m";
	const string uul = e + "24m";
	const string bl = e + "5m";
	const string ubl = e + "25m";
	const string s = e + "9m";
	const string us = e + "29m";
	const string reset_base = e + "0m";
	string reset = reset_base;

	const regex escape_regex("\033\\[\\d+;?\\d?;?\\d*;?\\d*;?\\d*(m|f|s|u|C|D|A|B){1}");

	const regex color_regex("\033\\[\\d+;?\\d?;?\\d*;?\\d*;?\\d*(m){1}");

	string uncolor(string& s){
		return regex_replace(s, color_regex, "");
	}
}

//* Collection of escape codes and functions for cursor manipulation
namespace Mv {
	const string to(int line, int col){ return Fx::e + to_string(line) + ";" + to_string(col) + "f";}
	const string r(int x){ return Fx::e + to_string(x) + "C";}
	const string l(int x){ return Fx::e + to_string(x) + "D";}
	const string u(int x){ return Fx::e + to_string(x) + "A";}
	const string d(int x) { return Fx::e + to_string(x) + "B";}
	const string save = Fx::e + "s";
	const string restore = Fx::e + "u";
}


//* Collection of escape codes and functions for terminal manipulation
namespace Term {

	bool initialized = false;
	bool resized = false;
	uint width = 0;
	uint height = 0;
	string fg, bg, current_tty;

	const string hide_cursor = Fx::e + "?25l";
	const string show_cursor = Fx::e + "?25h";
	const string alt_screen = Fx::e + "?1049h";
	const string normal_screen = Fx::e + "?1049l";
	const string clear = Fx::e + "2J" + Fx::e + "0;0f";
	const string clear_end = Fx::e + "0J";
	const string clear_begin = Fx::e + "1J";
	const string mouse_on = Fx::e + "?1002h" + Fx::e + "?1015h" + Fx::e + "?1006h";
	const string mouse_off = Fx::e + "?1002l";
	const string mouse_direct_on = Fx::e + "?1003h";
	const string mouse_direct_off = Fx::e + "?1003l";

	namespace {
		struct termios initial_settings;

		//* Toggle terminal input echo
		bool echo(bool on=true){
			struct termios settings;
			if (tcgetattr(STDIN_FILENO, &settings)) return false;
			if (on) settings.c_lflag |= ECHO;
			else settings.c_lflag &= ~(ECHO);
			return 0 == tcsetattr(STDIN_FILENO, TCSANOW, &settings);
		}

		//* Toggle need for return key when reading input
		bool linebuffered(bool on=true){
			struct termios settings;
			if (tcgetattr(STDIN_FILENO, &settings)) return false;
			if (on) settings.c_lflag |= ICANON;
			else settings.c_lflag &= ~(ICANON);
			if (tcsetattr(STDIN_FILENO, TCSANOW, &settings)) return false;
			if (on) setlinebuf(stdin);
			else setbuf(stdin, NULL);
			return true;
		}
	}

	bool refresh(){
		struct winsize w;
		ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
		if (width != w.ws_col || height != w.ws_row) {
			width = w.ws_col;
			height = w.ws_row;
			resized = true;
		}
		return resized;
	}

	bool init(){
		if (!initialized){
			initialized = (bool)isatty(STDIN_FILENO);
			if (initialized) {
				tcgetattr(STDIN_FILENO, &initial_settings);
				current_tty = (string)ttyname(STDIN_FILENO);
				cin.sync_with_stdio(false);
				cin.tie(NULL);
				echo(false);
				linebuffered(false);
				refresh();
				resized = false;
			}
		}
		return initialized;
	}

	void restore(){
		if (initialized) {
			echo(true);
			linebuffered(true);
			tcsetattr(STDIN_FILENO, TCSANOW, &initial_settings);
			initialized = false;
		}
	}
}

//? --------------------------------------------------- FUNCTIONS -----------------------------------------------------

namespace Tools {

	namespace {
		//? Units for floating_humanizer function
		const array<string, 11> Units_bit = {"bit", "Kib", "Mib", "Gib", "Tib", "Pib", "Eib", "Zib", "Yib", "Bib", "GEb"};
		const array<string, 11> Units_byte = {"Byte", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB", "BiB", "GEB"};
	}

	size_t ulen(string str, const bool escape){
		if (escape) str = std::regex_replace(str, Fx::escape_regex, "");
		return rng::count_if(str, [](char c) { return (static_cast<unsigned char>(c) & 0xC0) != 0x80; } );
	}

	string uresize(string str, const size_t len){
		if (str.size() < 1) return str;
		if (len < 1) return ""