btop/src/btop_input.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 <iostream>

#include <btop_input.hpp>
#include <btop_tools.hpp>
#include <btop_config.hpp>
#include <btop_shared.hpp>
#include <btop_menu.hpp>

using std::cin, std::string_literals::operator""s;
using namespace Tools;

namespace Input {
	namespace {
		//* Map for translating key codes to readable values
		const unordered_flat_map<string, string> Key_escapes = {
			{"\033",	"escape"},
			{"\n",		"enter"},
			{" ",		"space"},
			{"\x7f",	"backspace"},
			{"\x08",	"backspace"},
			{"[A", 		"up"},
			{"OA",		"up"},
			{"[B", 		"down"},
			{"OB",		"down"},
			{"[D", 		"left"},
			{"OD",		"left"},
			{"[C", 		"right"},
			{"OC",		"right"},
			{"[2~",		"insert"},
			{"[3~",		"delete"},
			{"[H",		"home"},
			{"[F",		"end"},
			{"[5~",		"page_up"},
			{"[6~",		"page_down"},
			{"\t",		"tab"},
			{"[Z",		"shift_tab"},
			{"OP",		"f1"},
			{"OQ",		"f2"},
			{"OR",		"f3"},
			{"OS",		"f4"},
			{"[15~",	"f5"},
			{"[17~",	"f6"},
			{"[18~",	"f7"},
			{"[19~",	"f8"},
			{"[20~",	"f9"},
			{"[21~",	"f10"},
			{"[23~",	"f11"},
			{"[24~",	"f12"}
		};
	}

	std::atomic<bool> interrupt (false);
	array<int, 2> mouse_pos;
	unordered_flat_map<string, Mouse_loc> mouse_mappings;

	string last = "";

	bool poll(int timeout) {
		if (timeout < 1) return cin.rdbuf()->in_avail() > 0;
		while (timeout > 0) {
			if (cin.rdbuf()->in_avail() > 0) return true;
			if (interrupt) { interrupt = false; return false; }
			sleep_ms(timeout < 10 ? timeout : 10);
			timeout -= 10;
		}
		return false;
	}

	string get() {
		string key;
		while (cin.rdbuf()->in_avail() > 0 and key.size() < 100) key += cin.get();
		if (cin.rdbuf()->in_avail() > 0) cin.ignore(SSmax);
		if (not key.empty()) {
			//? Remove escape code prefix if present
			if (key.substr(0, 2) == Fx::e) {
				key.erase(0, 1);
			}
			//? Detect if input is an mouse event
			if (key.starts_with("[<")) {
				std::string_view key_view = key;
				string mouse_event;
				if (key_view.starts_with("[<0;") and key_view.ends_with('M')) {
					mouse_event = "mouse_click";
					key_view.remove_prefix(4);
				}
				else if (key_view.starts_with("[<0;") and key_view.ends_with('m')) {
					mouse_event = "mouse_release";
					key_view.remove_prefix(4);
				}
				else if (key_view.starts_with("[<64;")) {
					mouse_event = "mouse_scroll_up";
					key_view.remove_prefix(5);
				}
				else if (key_view.starts_with("[<65;")) {
					mouse_event = "mouse_scroll_down";
					key_view.remove_prefix(5);
				}
				else
					key.clear();

				//? Get column and line position of mouse and check for any actions mapped to current position
				if (not key.empty()) {
					try {
						const auto delim = key_view.find(';');
						mouse_pos[0] = stoi((string)key_view.substr(0, delim));
						mouse_pos[1] = stoi((string)key_view.substr(delim + 1, key_view.find('M', delim)));
					}
					catch (const std::invalid_argument&) { mouse_event.clear(); }
					catch (const std::out_of_range&) { mouse_event.clear(); }

					key = mouse_event;

					if (not Menu::active and key == "mouse_click") {
						const auto& [col, line] = mouse_pos;

						for (const auto& [mapped_key, pos] : mouse_mappings) {
							if (col >= pos.col and col < pos.col + pos.width and line >= pos.line and line < pos.line + pos.height) {
								key = mapped_key;
								break;
							}
						}
					}
				}

			}
			else if (Key_escapes.contains(key))
				key = Key_escapes.at(key);
			else if (ulen(key) > 1)
				key.clear();

			last = key;
		}
		return key;
	}

	string wait() {
		while (cin.rdbuf()->in_avail() < 1) {
			if (interrupt) { interrupt = false; return ""; }
			sleep_ms(10);
		}
		return get();
	}

	void clear() {
		last.clear();
	}

	void process(const string key) {
		if (key.empty()) return;
		try {
			auto& filtering = Config::getB("proc_filtering");
			if (not filtering and key == "q") clean_quit(0);
			bool recollect = true;
			bool redraw = true;

			//? Input actions for proc box
			if (Proc::shown) {
				bool keep_going = false;
				if (filtering) {
					string filter = Config::getS("proc_filter");
					if (key == "enter")
						Config::set("proc_filtering", false);

					else if (key == "backspace" and not filter.empty())
						filter = uresize(filter, ulen(filter) - 1);

					else if (key == "space")
						filter.push_back(' ');

					else if (ulen(key) == 1)
						filter.append(key);

					else
						return;

					Config::set("proc_filter", filter);
				}
				else if (key == "left") {
					int cur_i = v_index(Proc::sort_vector, Config::getS("proc_sorting"));
					if (--cur_i < 0)
						cur_i = Proc::sort_vector.size() - 1;
					Config::set("proc_sorting", Proc::sort_vector.at(cur_i));
				}
				else if (key == "right") {
					int cur_i = v_index(Proc::sort_vector, Config::getS("proc_sorting"));
					if (++cur_i > (int)Proc::sort_vector.size() - 1)
						cur_i = 0;
					Config::set("proc_sorting", Proc::sort_vector.at(cur_i));
				}
				else if (key == "f") {
					Config::flip("proc_filtering");
					recollect = false;
				}
				else if (key == "t")
					Config::flip("proc_tree");

				else if (key == "r")
					Config::flip("proc_reversed");

				else if (key == "c")
					Config::flip("proc_per_core");

				else if (key == "delete" and not Config::getS("proc_filter").empty())
					Config::set("proc_filter", ""s);

				else if (key == "ö") {
					if (Global::overlay.empty())
						Global::overlay = Mv::to(Term::height / 2, Term::width / 2) + "\x1b[1;32mTESTING";
					else
						Global::overlay.clear();
					Runner::run("all", true, true);
				}
				else if (key.starts_with("mouse_")) {
					recollect = redraw = false;
					const auto& [col, line] = mouse_pos;
					int y = (Config::getB("show_detailed") ? Proc::y + 9 : Proc::y);
					if (col >= Proc::x + 1 and col < Proc::x + Proc::width - 1 and line >= y + 1 and line < y + Proc::height - 1) {
						if (key == "mouse_click") {

						}
						else
							if (not Proc::selection(key)) keep_going = true;
					}
					else if (key == "mouse_click" and Config::getI("proc_selected") > 0) {
						Config::set("proc_selected", 0);
						keep_going = true;
					}
					else
						keep_going = true;
				}
				else if (is_in(key, "up", "down", "page_up", "page_down", "home", "end")) {
					recollect = redraw = false;
					if (not Proc::selection(key)) keep_going = true;
				}
				else keep_going = true;

				if (not keep_going) {
					Runner::run("proc", not recollect, redraw);
					return;
				}
			}
		}


		catch (const std::exception& e) {
			throw std::runtime_error("Input::process(\"" + key + "\") : " + (string)e.what());
		}
	}

}