1 #include "cache.h" 2 #include "config.h" 3 #include <poll.h> 4 #include <stdio.h> 5 #include <subcmd/help.h> 6 #include "../builtin.h" 7 #include "levenshtein.h" 8 9 static int autocorrect; 10 11 static int perf_unknown_cmd_config(const char *var, const char *value, 12 void *cb __maybe_unused) 13 { 14 if (!strcmp(var, "help.autocorrect")) 15 autocorrect = perf_config_int(var,value); 16 17 return 0; 18 } 19 20 static int levenshtein_compare(const void *p1, const void *p2) 21 { 22 const struct cmdname *const *c1 = p1, *const *c2 = p2; 23 const char *s1 = (*c1)->name, *s2 = (*c2)->name; 24 int l1 = (*c1)->len; 25 int l2 = (*c2)->len; 26 return l1 != l2 ? l1 - l2 : strcmp(s1, s2); 27 } 28 29 static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old) 30 { 31 unsigned int i, nr = cmds->cnt + old->cnt; 32 void *tmp; 33 34 if (nr > cmds->alloc) { 35 /* Choose bigger one to alloc */ 36 if (alloc_nr(cmds->alloc) < nr) 37 cmds->alloc = nr; 38 else 39 cmds->alloc = alloc_nr(cmds->alloc); 40 tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names)); 41 if (!tmp) 42 return -1; 43 cmds->names = tmp; 44 } 45 for (i = 0; i < old->cnt; i++) 46 cmds->names[cmds->cnt++] = old->names[i]; 47 zfree(&old->names); 48 old->cnt = 0; 49 return 0; 50 } 51 52 const char *help_unknown_cmd(const char *cmd) 53 { 54 unsigned int i, n = 0, best_similarity = 0; 55 struct cmdnames main_cmds, other_cmds; 56 57 memset(&main_cmds, 0, sizeof(main_cmds)); 58 memset(&other_cmds, 0, sizeof(main_cmds)); 59 60 perf_config(perf_unknown_cmd_config, NULL); 61 62 load_command_list("perf-", &main_cmds, &other_cmds); 63 64 if (add_cmd_list(&main_cmds, &other_cmds) < 0) { 65 fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n"); 66 goto end; 67 } 68 qsort(main_cmds.names, main_cmds.cnt, 69 sizeof(main_cmds.names), cmdname_compare); 70 uniq(&main_cmds); 71 72 if (main_cmds.cnt) { 73 /* This reuses cmdname->len for similarity index */ 74 for (i = 0; i < main_cmds.cnt; ++i) 75 main_cmds.names[i]->len = 76 levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4); 77 78 qsort(main_cmds.names, main_cmds.cnt, 79 sizeof(*main_cmds.names), levenshtein_compare); 80 81 best_similarity = main_cmds.names[0]->len; 82 n = 1; 83 while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len) 84 ++n; 85 } 86 87 if (autocorrect && n == 1) { 88 const char *assumed = main_cmds.names[0]->name; 89 90 main_cmds.names[0] = NULL; 91 clean_cmdnames(&main_cmds); 92 fprintf(stderr, "WARNING: You called a perf program named '%s', " 93 "which does not exist.\n" 94 "Continuing under the assumption that you meant '%s'\n", 95 cmd, assumed); 96 if (autocorrect > 0) { 97 fprintf(stderr, "in %0.1f seconds automatically...\n", 98 (float)autocorrect/10.0); 99 poll(NULL, 0, autocorrect * 100); 100 } 101 return assumed; 102 } 103 104 fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd); 105 106 if (main_cmds.cnt && best_similarity < 6) { 107 fprintf(stderr, "\nDid you mean %s?\n", 108 n < 2 ? "this": "one of these"); 109 110 for (i = 0; i < n; i++) 111 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name); 112 } 113 end: 114 exit(1); 115 } 116