4 #include <subcmd/help.h>
5 #include "../builtin.h"
6 #include "levenshtein.h"
8 static int autocorrect;
9 static struct cmdnames aliases;
11 static int perf_unknown_cmd_config(const char *var, const char *value,
12 void *cb __maybe_unused)
14 if (!strcmp(var, "help.autocorrect"))
15 autocorrect = perf_config_int(var,value);
16 /* Also use aliases for command lookup */
17 if (!prefixcmp(var, "alias."))
18 add_cmdname(&aliases, var + 6, strlen(var + 6));
23 static int levenshtein_compare(const void *p1, const void *p2)
25 const struct cmdname *const *c1 = p1, *const *c2 = p2;
26 const char *s1 = (*c1)->name, *s2 = (*c2)->name;
29 return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
32 static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
34 unsigned int i, nr = cmds->cnt + old->cnt;
37 if (nr > cmds->alloc) {
38 /* Choose bigger one to alloc */
39 if (alloc_nr(cmds->alloc) < nr)
42 cmds->alloc = alloc_nr(cmds->alloc);
43 tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
48 for (i = 0; i < old->cnt; i++)
49 cmds->names[cmds->cnt++] = old->names[i];
55 const char *help_unknown_cmd(const char *cmd)
57 unsigned int i, n = 0, best_similarity = 0;
58 struct cmdnames main_cmds, other_cmds;
60 memset(&main_cmds, 0, sizeof(main_cmds));
61 memset(&other_cmds, 0, sizeof(main_cmds));
62 memset(&aliases, 0, sizeof(aliases));
64 perf_config(perf_unknown_cmd_config, NULL);
66 load_command_list("perf-", &main_cmds, &other_cmds);
68 if (add_cmd_list(&main_cmds, &aliases) < 0 ||
69 add_cmd_list(&main_cmds, &other_cmds) < 0) {
70 fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
73 qsort(main_cmds.names, main_cmds.cnt,
74 sizeof(main_cmds.names), cmdname_compare);
78 /* This reuses cmdname->len for similarity index */
79 for (i = 0; i < main_cmds.cnt; ++i)
80 main_cmds.names[i]->len =
81 levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
83 qsort(main_cmds.names, main_cmds.cnt,
84 sizeof(*main_cmds.names), levenshtein_compare);
86 best_similarity = main_cmds.names[0]->len;
88 while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
92 if (autocorrect && n == 1) {
93 const char *assumed = main_cmds.names[0]->name;
95 main_cmds.names[0] = NULL;
96 clean_cmdnames(&main_cmds);
97 fprintf(stderr, "WARNING: You called a perf program named '%s', "
98 "which does not exist.\n"
99 "Continuing under the assumption that you meant '%s'\n",
101 if (autocorrect > 0) {
102 fprintf(stderr, "in %0.1f seconds automatically...\n",
103 (float)autocorrect/10.0);
104 poll(NULL, 0, autocorrect * 100);
109 fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
111 if (main_cmds.cnt && best_similarity < 6) {
112 fprintf(stderr, "\nDid you mean %s?\n",
113 n < 2 ? "this": "one of these");
115 for (i = 0; i < n; i++)
116 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);