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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