| 1 | /*
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| 2 | * Souffle - A Datalog Compiler
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| 3 | * Copyright (c) 2017, The Souffle Developers. All rights reserved
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| 4 | * Licensed under the Universal Permissive License v 1.0 as shown at:
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| 5 | * - https://opensource.org/licenses/UPL
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| 6 | * - <souffle root>/licenses/SOUFFLE-UPL.txt
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| 7 | */
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| 8 |
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| 9 | #pragma once
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| 10 |
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| 11 | #include <iostream> // for operator<<, flush, basic_ostream, cout, ostream
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| 12 | #include <iterator> // for end, begin
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| 13 | #include <string>
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| 14 | #include <vector>
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| 15 |
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| 16 | #ifndef _MSC_VER
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| 17 | #include <termios.h> // for termios, tcsetattr, tcgetattr, ECHO, ICANON, cc_t
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| 18 | #include <unistd.h> // for read
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| 19 | #endif
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| 20 |
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| 21 | namespace souffle {
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| 22 | namespace profile {
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| 23 |
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| 24 | /*
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| 25 | * A class that reads user input a char at a time allowing for tab completion and history
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| 26 | */
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| 27 | class InputReader {
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| 28 | private:
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| 29 | std::string prompt = "Input: ";
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| 30 | std::vector<std::string> tab_completion;
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| 31 | std::vector<std::string> history;
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| 32 | std::string output;
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| 33 | char current_char = 0;
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| 34 | std::size_t cursor_pos = 0;
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| 35 | std::size_t hist_pos = 0;
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| 36 | std::size_t tab_pos = 0;
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| 37 | bool in_tab_complete = false;
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| 38 | bool in_history = false;
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| 39 | std::string original_hist_val;
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| 40 | std::string current_hist_val;
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| 41 | std::string current_tab_val;
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| 42 | std::string original_tab_val;
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| 43 | std::vector<std::string> current_tab_completes;
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| 44 | std::size_t original_hist_cursor_pos = 0;
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| 45 | bool inputReceived = false;
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| 46 |
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| 47 | public:
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| 48 | InputReader() {
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| 49 | clearTabCompletion();
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| 50 | clearHistory();
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| 51 | }
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| 52 |
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| 53 | InputReader(const InputReader& other) = default;
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| 54 |
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| 55 | bool hasReceivedInput() {
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| 56 | return inputReceived;
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| 57 | }
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| 58 |
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| 59 | void readchar() {
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| 60 | #ifndef _MSC_VER
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| 61 | char buf = 0;
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| 62 | struct termios old = {};
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| 63 | if (tcgetattr(0, &old) < 0) {
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| 64 | perror("tcsetattr()");
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| 65 | }
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| 66 | old.c_lflag &= ~ICANON;
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| 67 | old.c_lflag &= ~ECHO;
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| 68 | old.c_cc[VMIN] = 1;
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| 69 | old.c_cc[VTIME] = 0;
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| 70 | if (tcsetattr(0, TCSANOW, &old) < 0) {
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| 71 | perror("tcsetattr ICANON");
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| 72 | }
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| 73 | if (::read(0, &buf, 1) < 0) {
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| 74 | perror("read()");
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| 75 | }
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| 76 | old.c_lflag |= ICANON;
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| 77 | old.c_lflag |= ECHO;
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| 78 | if (tcsetattr(0, TCSADRAIN, &old) < 0) {
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| 79 | perror("tcsetattr ~ICANON");
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| 80 | }
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| 81 |
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| 82 | current_char = buf;
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| 83 | #else
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| 84 | char buf = 0;
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| 85 | if (_read(0, &buf, 1) < 0) {
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| 86 | perror("read()");
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| 87 | }
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| 88 | current_char = buf;
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| 89 | #endif
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| 90 | }
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| 91 | std::string getInput() {
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| 92 | output = "";
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| 93 | current_char = 0;
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| 94 | cursor_pos = 0;
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| 95 | hist_pos = 0;
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| 96 | tab_pos = 0;
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| 97 | in_tab_complete = false;
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| 98 | in_history = false;
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| 99 |
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| 100 | std::cout << this->prompt << std::flush;
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| 101 | readchar();
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| 102 | inputReceived = true;
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| 103 |
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| 104 | bool escaped = false;
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| 105 | bool arrow_key = false;
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| 106 |
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| 107 | while (current_char != '\n') {
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| 108 | if (arrow_key) {
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| 109 | moveCursor(current_char);
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| 110 | escaped = false;
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| 111 | arrow_key = false;
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| 112 | } else if (escaped) {
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| 113 | if (current_char == '[') {
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| 114 | arrow_key = true;
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| 115 | }
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| 116 | } else {
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| 117 | if (current_char == 27) { // esc char for arrow keys
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| 118 | escaped = true;
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| 119 | } else if (current_char == '\t') {
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| 120 | tabComplete();
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| 121 | } else {
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| 122 | if (in_history) {
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| 123 | output = current_hist_val;
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| 124 | in_history = false;
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| 125 |
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| 126 | } else if (in_tab_complete) {
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| 127 | output = current_tab_val;
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| 128 | in_tab_complete = false;
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| 129 | }
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| 130 |
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| 131 | if (current_char == 127) {
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| 132 | backspace();
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| 133 | } else {
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| 134 | output.insert(output.begin() + (cursor_pos++), current_char);
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| 135 | std::cout << current_char << std::flush;
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| 136 | showFullText(output);
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| 137 | }
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | readchar();
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| 142 | }
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| 143 |
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| 144 | if (in_history) {
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| 145 | return current_hist_val;
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| 146 | }
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| 147 | if (in_tab_complete) {
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| 148 | return current_tab_val;
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| 149 | }
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| 150 |
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| 151 | return output;
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| 152 | }
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| 153 |
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| 154 | void setPrompt(std::string prompt) {
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| 155 | this->prompt = prompt;
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| 156 | }
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| 157 | void appendTabCompletion(std::vector<std::string> commands) {
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| 158 | tab_completion.insert(std::end(tab_completion), std::begin(commands), std::end(commands));
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| 159 | }
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| 160 | void appendTabCompletion(std::string command) {
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| 161 | tab_completion.push_back(command);
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| 162 | }
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| 163 | void clearTabCompletion() {
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| 164 | tab_completion = std::vector<std::string>();
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| 165 | }
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| 166 | void clearHistory() {
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| 167 | history = std::vector<std::string>();
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| 168 | }
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| 169 | void tabComplete() {
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| 170 | if (in_history) {
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| 171 | output = current_hist_val;
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| 172 | in_history = false;
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| 173 | }
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| 174 | if (!in_tab_complete) {
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| 175 | current_tab_completes = std::vector<std::string>();
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| 176 | original_tab_val = output;
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| 177 | bool found_tab = false;
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| 178 | for (auto& a : tab_completion) {
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| 179 | if (a.find(original_tab_val) == 0) {
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| 180 | current_tab_completes.push_back(a);
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| 181 | found_tab = true;
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| 182 | }
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| 183 | }
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| 184 | if (!found_tab) {
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| 185 | std::cout << '\a' << std::flush;
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| 186 | return;
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| 187 | } else {
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| 188 | in_tab_complete = true;
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| 189 | tab_pos = 0;
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| 190 | current_tab_val = current_tab_completes.at((unsigned)tab_pos);
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| 191 | clearPrompt(output.size());
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| 192 |
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| 193 | cursor_pos = current_tab_val.size();
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| 194 | std::cout << current_tab_val << std::flush;
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| 195 | }
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| 196 | } else {
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| 197 | if (tab_pos + 1 >= current_tab_completes.size()) {
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| 198 | clearPrompt(current_tab_val.size());
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| 199 | current_tab_val = original_tab_val;
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| 200 | in_tab_complete = false;
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| 201 | cursor_pos = output.size();
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| 202 | std::cout << output << std::flush;
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| 203 | } else {
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| 204 | tab_pos++;
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| 205 |
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| 206 | clearPrompt(current_tab_val.size());
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| 207 | current_tab_val = current_tab_completes.at((unsigned)tab_pos);
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| 208 |
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| 209 | cursor_pos = current_tab_val.size();
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| 210 | std::cout << current_tab_val << std::flush;
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| 211 | }
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| 212 | }
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| 213 | }
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| 214 | void addHistory(std::string hist) {
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| 215 | if (history.size() > 0) {
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| 216 | // only add to history if the last command wasn't the same
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| 217 | if (hist == history.at(history.size() - 1)) {
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| 218 | return;
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| 219 | }
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| 220 | }
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| 221 | history.push_back(hist);
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| 222 | }
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| 223 | void historyUp() {
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| 224 | if (history.empty()) {
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| 225 | std::cout << '\a' << std::flush;
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| 226 | return;
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| 227 | }
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| 228 | if (in_tab_complete) {
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| 229 | output = current_tab_val;
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| 230 | in_tab_complete = false;
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| 231 | }
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| 232 | if (!in_history) {
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| 233 | original_hist_val = output;
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| 234 | original_hist_cursor_pos = cursor_pos;
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| 235 | in_history = true;
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| 236 | clearPrompt(output.size());
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| 237 | hist_pos = history.size() - 1;
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| 238 | current_hist_val = history.back();
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| 239 | cursor_pos = current_hist_val.size();
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| 240 | std::cout << current_hist_val << std::flush;
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| 241 | } else {
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| 242 | if (hist_pos > 0) {
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| 243 | hist_pos--;
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| 244 | clearPrompt(current_hist_val.size());
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| 245 | current_hist_val = history.at((unsigned)hist_pos);
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| 246 | cursor_pos = current_hist_val.size();
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| 247 | std::cout << current_hist_val << std::flush;
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| 248 | } else {
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| 249 | std::cout << '\a' << std::flush;
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| 250 | }
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| 251 | }
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| 252 | }
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| 253 | void historyDown() {
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| 254 | if (in_history) {
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| 255 | clearPrompt(current_hist_val.size());
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| 256 | if (hist_pos + 1 < history.size()) {
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| 257 | hist_pos++;
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| 258 | current_hist_val = history.at((unsigned)hist_pos);
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| 259 | cursor_pos = current_hist_val.size();
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| 260 | std::cout << current_hist_val << std::flush;
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| 261 | } else {
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| 262 | in_history = false;
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| 263 | cursor_pos = original_hist_cursor_pos;
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| 264 | std::cout << original_hist_val << std::flush;
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| 265 | }
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| 266 | } else {
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| 267 | std::cout << '\a' << std::flush;
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| 268 | }
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| 269 | }
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| 270 | void moveCursor(char direction) {
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| 271 | switch (direction) {
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| 272 | case 'A': historyUp(); break;
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| 273 | case 'B': historyDown(); break;
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| 274 | case 'C': moveCursorRight(); break;
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| 275 | case 'D': moveCursorLeft(); break;
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| 276 | default: break;
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| 277 | }
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| 278 | }
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| 279 | void moveCursorRight() {
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| 280 | if (in_history) {
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| 281 | if (cursor_pos < current_hist_val.size()) {
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| 282 | cursor_pos++;
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| 283 | std::cout << (char)27 << '[' << 'C' << std::flush;
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| 284 | }
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| 285 | } else if (in_tab_complete) {
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| 286 | if (cursor_pos < current_tab_val.size()) {
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| 287 | cursor_pos++;
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| 288 | std::cout << (char)27 << '[' << 'C' << std::flush;
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| 289 | }
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| 290 | } else if (cursor_pos < output.size()) {
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| 291 | cursor_pos++;
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| 292 | std::cout << (char)27 << '[' << 'C' << std::flush;
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| 293 | }
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| 294 | }
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| 295 | void moveCursorLeft() {
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| 296 | if (cursor_pos > 0) {
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| 297 | cursor_pos--;
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| 298 | std::cout << (char)27 << '[' << 'D' << std::flush;
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| 299 | }
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| 300 | }
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| 301 | void backspace() {
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| 302 | if (cursor_pos > 0) {
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| 303 | output.erase(output.begin() + cursor_pos - 1);
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| 304 | moveCursorLeft();
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| 305 | showFullText(output);
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| 306 | }
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| 307 | }
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| 308 | void clearPrompt(std::size_t text_len) {
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| 309 | for (std::size_t i = cursor_pos; i < text_len + 1; i++) {
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| 310 | std::cout << (char)27 << "[C" << std::flush;
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| 311 | }
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| 312 | for (std::size_t i = 0; i < text_len + 1; i++) {
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| 313 | std::cout << "\b \b" << std::flush;
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| 314 | }
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| 315 | }
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| 316 | void showFullText(const std::string& text) {
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| 317 | clearPrompt(text.size());
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| 318 | for (char i : text) {
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| 319 | std::cout << i << std::flush;
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| 320 | }
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| 321 |
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| 322 | for (std::size_t i = cursor_pos; i < text.size(); i++) {
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| 323 | std::cout << "\b" << std::flush;
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| 324 | }
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| 325 | }
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| 326 | };
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| 327 |
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| 328 | } // namespace profile
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| 329 | } // namespace souffle
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