1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include "cache.h"
3*4882a593Smuzhiyun #include "config.h"
4*4882a593Smuzhiyun #include <poll.h>
5*4882a593Smuzhiyun #include <stdio.h>
6*4882a593Smuzhiyun #include <stdlib.h>
7*4882a593Smuzhiyun #include <subcmd/help.h>
8*4882a593Smuzhiyun #include "../builtin.h"
9*4882a593Smuzhiyun #include "levenshtein.h"
10*4882a593Smuzhiyun #include <linux/zalloc.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun static int autocorrect;
13*4882a593Smuzhiyun
perf_unknown_cmd_config(const char * var,const char * value,void * cb __maybe_unused)14*4882a593Smuzhiyun static int perf_unknown_cmd_config(const char *var, const char *value,
15*4882a593Smuzhiyun void *cb __maybe_unused)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun if (!strcmp(var, "help.autocorrect"))
18*4882a593Smuzhiyun return perf_config_int(&autocorrect, var,value);
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun return 0;
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
levenshtein_compare(const void * p1,const void * p2)23*4882a593Smuzhiyun static int levenshtein_compare(const void *p1, const void *p2)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun const struct cmdname *const *c1 = p1, *const *c2 = p2;
26*4882a593Smuzhiyun const char *s1 = (*c1)->name, *s2 = (*c2)->name;
27*4882a593Smuzhiyun int l1 = (*c1)->len;
28*4882a593Smuzhiyun int l2 = (*c2)->len;
29*4882a593Smuzhiyun return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
add_cmd_list(struct cmdnames * cmds,struct cmdnames * old)32*4882a593Smuzhiyun static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun unsigned int i, nr = cmds->cnt + old->cnt;
35*4882a593Smuzhiyun void *tmp;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (nr > cmds->alloc) {
38*4882a593Smuzhiyun /* Choose bigger one to alloc */
39*4882a593Smuzhiyun if (alloc_nr(cmds->alloc) < nr)
40*4882a593Smuzhiyun cmds->alloc = nr;
41*4882a593Smuzhiyun else
42*4882a593Smuzhiyun cmds->alloc = alloc_nr(cmds->alloc);
43*4882a593Smuzhiyun tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
44*4882a593Smuzhiyun if (!tmp)
45*4882a593Smuzhiyun return -1;
46*4882a593Smuzhiyun cmds->names = tmp;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun for (i = 0; i < old->cnt; i++)
49*4882a593Smuzhiyun cmds->names[cmds->cnt++] = old->names[i];
50*4882a593Smuzhiyun zfree(&old->names);
51*4882a593Smuzhiyun old->cnt = 0;
52*4882a593Smuzhiyun return 0;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
help_unknown_cmd(const char * cmd)55*4882a593Smuzhiyun const char *help_unknown_cmd(const char *cmd)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun unsigned int i, n = 0, best_similarity = 0;
58*4882a593Smuzhiyun struct cmdnames main_cmds, other_cmds;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun memset(&main_cmds, 0, sizeof(main_cmds));
61*4882a593Smuzhiyun memset(&other_cmds, 0, sizeof(main_cmds));
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun perf_config(perf_unknown_cmd_config, NULL);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun load_command_list("perf-", &main_cmds, &other_cmds);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (add_cmd_list(&main_cmds, &other_cmds) < 0) {
68*4882a593Smuzhiyun fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
69*4882a593Smuzhiyun goto end;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun qsort(main_cmds.names, main_cmds.cnt,
72*4882a593Smuzhiyun sizeof(main_cmds.names), cmdname_compare);
73*4882a593Smuzhiyun uniq(&main_cmds);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (main_cmds.cnt) {
76*4882a593Smuzhiyun /* This reuses cmdname->len for similarity index */
77*4882a593Smuzhiyun for (i = 0; i < main_cmds.cnt; ++i)
78*4882a593Smuzhiyun main_cmds.names[i]->len =
79*4882a593Smuzhiyun levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun qsort(main_cmds.names, main_cmds.cnt,
82*4882a593Smuzhiyun sizeof(*main_cmds.names), levenshtein_compare);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun best_similarity = main_cmds.names[0]->len;
85*4882a593Smuzhiyun n = 1;
86*4882a593Smuzhiyun while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
87*4882a593Smuzhiyun ++n;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (autocorrect && n == 1) {
91*4882a593Smuzhiyun const char *assumed = main_cmds.names[0]->name;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun main_cmds.names[0] = NULL;
94*4882a593Smuzhiyun clean_cmdnames(&main_cmds);
95*4882a593Smuzhiyun fprintf(stderr, "WARNING: You called a perf program named '%s', "
96*4882a593Smuzhiyun "which does not exist.\n"
97*4882a593Smuzhiyun "Continuing under the assumption that you meant '%s'\n",
98*4882a593Smuzhiyun cmd, assumed);
99*4882a593Smuzhiyun if (autocorrect > 0) {
100*4882a593Smuzhiyun fprintf(stderr, "in %0.1f seconds automatically...\n",
101*4882a593Smuzhiyun (float)autocorrect/10.0);
102*4882a593Smuzhiyun poll(NULL, 0, autocorrect * 100);
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun return assumed;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun if (main_cmds.cnt && best_similarity < 6) {
110*4882a593Smuzhiyun fprintf(stderr, "\nDid you mean %s?\n",
111*4882a593Smuzhiyun n < 2 ? "this": "one of these");
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun for (i = 0; i < n; i++)
114*4882a593Smuzhiyun fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun end:
117*4882a593Smuzhiyun exit(1);
118*4882a593Smuzhiyun }
119