2 #include <subcmd/help.h>
3 #include "../builtin.h"
4 #include "levenshtein.h"
6 static int autocorrect;
7 static struct cmdnames aliases;
9 static int perf_unknown_cmd_config(const char *var, const char *value,
10 void *cb __maybe_unused)
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));
21 static int levenshtein_compare(const void *p1, const void *p2)
23 const struct cmdname *const *c1 = p1, *const *c2 = p2;
24 const char *s1 = (*c1)->name, *s2 = (*c2)->name;
27 return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
30 static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
32 unsigned int i, nr = cmds->cnt + old->cnt;
35 if (nr > cmds->alloc) {
36 /* Choose bigger one to alloc */
37 if (alloc_nr(cmds->alloc) < nr)
40 cmds->alloc = alloc_nr(cmds->alloc);
41 tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
46 for (i = 0; i < old->cnt; i++)
47 cmds->names[cmds->cnt++] = old->names[i];
53 const char *help_unknown_cmd(const char *cmd)
55 unsigned int i, n = 0, best_similarity = 0;
56 struct cmdnames main_cmds, other_cmds;
58 memset(&main_cmds, 0, sizeof(main_cmds));
59 memset(&other_cmds, 0, sizeof(main_cmds));
60 memset(&aliases, 0, sizeof(aliases));
62 perf_config(perf_unknown_cmd_config, NULL);
64 load_command_list("perf-", &main_cmds, &other_cmds);
66 if (add_cmd_list(&main_cmds, &aliases) < 0 ||
67 add_cmd_list(&main_cmds, &other_cmds) < 0) {
68 fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
71 qsort(main_cmds.names, main_cmds.cnt,
72 sizeof(main_cmds.names), cmdname_compare);
76 /* This reuses cmdname->len for similarity index */
77 for (i = 0; i < main_cmds.cnt; ++i)
78 main_cmds.names[i]->len =
79 levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
81 qsort(main_cmds.names, main_cmds.cnt,
82 sizeof(*main_cmds.names), levenshtein_compare);
84 best_similarity = main_cmds.names[0]->len;
86 while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
90 if (autocorrect && n == 1) {
91 const char *assumed = main_cmds.names[0]->name;
93 main_cmds.names[0] = NULL;
94 clean_cmdnames(&main_cmds);
95 fprintf(stderr, "WARNING: You called a perf program named '%s', "
96 "which does not exist.\n"
97 "Continuing under the assumption that you meant '%s'\n",
99 if (autocorrect > 0) {
100 fprintf(stderr, "in %0.1f seconds automatically...\n",
101 (float)autocorrect/10.0);
102 poll(NULL, 0, autocorrect * 100);
107 fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
109 if (main_cmds.cnt && best_similarity < 6) {
110 fprintf(stderr, "\nDid you mean %s?\n",
111 n < 2 ? "this": "one of these");
113 for (i = 0; i < n; i++)
114 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);