File: dedup.cpp 1 /* 2 The MIT License (MIT) 3 4 Copyright © 2020-2025 pacman64 5 6 Permission is hereby granted, free of charge, to any person obtaining a copy of 7 this software and associated documentation files (the “Software”), to deal 8 in the Software without restriction, including without limitation the rights to 9 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 10 of the Software, and to permit persons to whom the Software is furnished to do 11 so, subject to the following conditions: 12 13 The above copyright notice and this permission notice shall be included in all 14 copies or substantial portions of the Software. 15 16 THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 SOFTWARE. 23 */ 24 25 /* 26 You can build this command-line app by running 27 28 c++ -Wall -s -O3 -march=native -mtune=native -flto -o dedup dedup.cpp 29 */ 30 31 #include <fstream> 32 #include <iostream> 33 #include <new> 34 #include <string> 35 #include <unistd.h> 36 37 #if defined FLAT_SET 38 #include <flat_set> 39 typedef std::flat_set<std::string> string_set; 40 #elif defined UNORDERED_SET 41 #include <unordered_set> 42 typedef std::unordered_set<std::string> string_set; 43 #else 44 #include <set> 45 typedef std::set<std::string> string_set; 46 #endif 47 48 #ifdef RED_ERRORS 49 #define ERROR_STYLE "\x1b[38;2;204;0;0m" 50 #ifdef __APPLE__ 51 #define ERROR_STYLE "\x1b[31m" 52 #endif 53 #define RESET_STYLE "\x1b[0m" 54 #else 55 #define ERROR_STYLE "" 56 #define RESET_STYLE "" 57 #endif 58 59 using namespace std; 60 61 const string info = "" 62 "dedup [files...]\n" 63 "\n" 64 "DEDUPlicate lines, emitting each distinct line once, on first occurrence.\n" 65 "Unlike `uniq`, it doesn't require pre-sorted lines to work correctly, and\n" 66 "keeps lines in their original order." 67 ""; 68 69 void handle_input_faster(istream& in, string& line, string_set& seen) { 70 while (!cout.eof() && getline(in, line)) { 71 if (seen.find(line) == seen.end()) { 72 cout << line << '\n'; 73 seen.insert(line); 74 } 75 } 76 77 // cout.flush(); 78 } 79 80 void handle_input(istream& in, string& line, string_set& seen, bool live) { 81 if (!live) { 82 handle_input_faster(in, line, seen); 83 return; 84 } 85 86 while (!cout.eof() && getline(in, line)) { 87 if (seen.find(line) == seen.end()) { 88 cout << line << endl; 89 seen.insert(line); 90 } 91 } 92 } 93 94 bool handle_file(const char* path, string& line, string_set& seen, bool live) { 95 ifstream f(path); 96 if (f.is_open()) { 97 handle_input(f, line, seen, live); 98 return true; 99 } 100 101 cerr << ERROR_STYLE "can't open file named '" << path << "'" RESET_STYLE << endl; 102 return false; 103 } 104 105 // run returns the number of errors 106 int run(size_t argc, char** argv, bool live_lines) { 107 string line; 108 string_set seen; 109 110 size_t start_args = 1; 111 if (argc > start_args) { 112 const string& s = argv[start_args]; 113 if (s == "-h" || s == "-help" || s == "--h" || s == "--help") { 114 cout << info; 115 return 0; 116 } 117 if (s == "--") { 118 start_args++; 119 } 120 } 121 122 if (argc > start_args) { 123 const string& s = argv[start_args]; 124 if (s == "--") { 125 start_args++; 126 } 127 } 128 129 cin.tie(NULL); 130 ios_base::sync_with_stdio(false); 131 132 size_t dashes = 0; 133 size_t errors = 0; 134 135 for (size_t i = start_args; i < argc && !cout.eof(); i++) { 136 if (argv[i][0] == '-' && argv[i][1] == 0) { 137 dashes++; 138 if (dashes < 2) { 139 handle_input(cin, line, seen, live_lines); 140 } 141 continue; 142 } 143 144 if (!handle_file(argv[i], line, seen, live_lines)) { 145 errors++; 146 } 147 } 148 149 if (argc < 2) { 150 handle_input(cin, line, seen, live_lines); 151 } 152 153 if (!live_lines) { 154 cout.flush(); 155 } 156 return errors; 157 } 158 159 int main(int argc, char** argv) { 160 const bool live_lines = lseek(fileno(stdout), 0, SEEK_CUR) != 0; 161 if (!live_lines) { 162 setvbuf(stdout, NULL, _IOFBF, 0); 163 } 164 165 try { 166 return run(argc, argv, live_lines) == 0 ? 0 : 1; 167 } catch (const bad_alloc& e) { 168 cerr << ERROR_STYLE "out of memory" RESET_STYLE << endl; 169 return 1; 170 } 171 }