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