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