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