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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5feaac24 | 2 | #include "cache.h" |
41840d21 | 3 | #include "config.h" |
4208735d | 4 | #include <poll.h> |
d0761e37 | 5 | #include <stdio.h> |
7f7c536f | 6 | #include <stdlib.h> |
4b6ab94e | 7 | #include <subcmd/help.h> |
5feaac24 JP |
8 | #include "../builtin.h" |
9 | #include "levenshtein.h" | |
7f7c536f | 10 | #include <linux/zalloc.h> |
5feaac24 JP |
11 | |
12 | static int autocorrect; | |
5feaac24 | 13 | |
b8cbb349 WN |
14 | static int perf_unknown_cmd_config(const char *var, const char *value, |
15 | void *cb __maybe_unused) | |
5feaac24 JP |
16 | { |
17 | if (!strcmp(var, "help.autocorrect")) | |
25ce4bb8 | 18 | return perf_config_int(&autocorrect, var,value); |
5feaac24 | 19 | |
b8cbb349 | 20 | return 0; |
5feaac24 JP |
21 | } |
22 | ||
23 | static int levenshtein_compare(const void *p1, const void *p2) | |
24 | { | |
25 | const struct cmdname *const *c1 = p1, *const *c2 = p2; | |
26 | const char *s1 = (*c1)->name, *s2 = (*c2)->name; | |
27 | int l1 = (*c1)->len; | |
28 | int l2 = (*c2)->len; | |
29 | return l1 != l2 ? l1 - l2 : strcmp(s1, s2); | |
30 | } | |
31 | ||
682f4f03 | 32 | static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old) |
5feaac24 | 33 | { |
682f4f03 MH |
34 | unsigned int i, nr = cmds->cnt + old->cnt; |
35 | void *tmp; | |
36 | ||
37 | if (nr > cmds->alloc) { | |
38 | /* Choose bigger one to alloc */ | |
39 | if (alloc_nr(cmds->alloc) < nr) | |
40 | cmds->alloc = nr; | |
41 | else | |
42 | cmds->alloc = alloc_nr(cmds->alloc); | |
43 | tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names)); | |
44 | if (!tmp) | |
45 | return -1; | |
46 | cmds->names = tmp; | |
47 | } | |
5feaac24 JP |
48 | for (i = 0; i < old->cnt; i++) |
49 | cmds->names[cmds->cnt++] = old->names[i]; | |
50 | zfree(&old->names); | |
51 | old->cnt = 0; | |
682f4f03 | 52 | return 0; |
5feaac24 JP |
53 | } |
54 | ||
55 | const char *help_unknown_cmd(const char *cmd) | |
56 | { | |
57 | unsigned int i, n = 0, best_similarity = 0; | |
58 | struct cmdnames main_cmds, other_cmds; | |
59 | ||
60 | memset(&main_cmds, 0, sizeof(main_cmds)); | |
61 | memset(&other_cmds, 0, sizeof(main_cmds)); | |
5feaac24 JP |
62 | |
63 | perf_config(perf_unknown_cmd_config, NULL); | |
64 | ||
65 | load_command_list("perf-", &main_cmds, &other_cmds); | |
66 | ||
c6867701 | 67 | if (add_cmd_list(&main_cmds, &other_cmds) < 0) { |
682f4f03 MH |
68 | fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n"); |
69 | goto end; | |
70 | } | |
5feaac24 JP |
71 | qsort(main_cmds.names, main_cmds.cnt, |
72 | sizeof(main_cmds.names), cmdname_compare); | |
73 | uniq(&main_cmds); | |
74 | ||
75 | if (main_cmds.cnt) { | |
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); | |
80 | ||
81 | qsort(main_cmds.names, main_cmds.cnt, | |
82 | sizeof(*main_cmds.names), levenshtein_compare); | |
83 | ||
84 | best_similarity = main_cmds.names[0]->len; | |
85 | n = 1; | |
86 | while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len) | |
87 | ++n; | |
88 | } | |
89 | ||
90 | if (autocorrect && n == 1) { | |
91 | const char *assumed = main_cmds.names[0]->name; | |
92 | ||
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", | |
98 | cmd, assumed); | |
99 | if (autocorrect > 0) { | |
100 | fprintf(stderr, "in %0.1f seconds automatically...\n", | |
101 | (float)autocorrect/10.0); | |
102 | poll(NULL, 0, autocorrect * 100); | |
103 | } | |
104 | return assumed; | |
105 | } | |
106 | ||
107 | fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd); | |
108 | ||
109 | if (main_cmds.cnt && best_similarity < 6) { | |
110 | fprintf(stderr, "\nDid you mean %s?\n", | |
111 | n < 2 ? "this": "one of these"); | |
112 | ||
113 | for (i = 0; i < n; i++) | |
114 | fprintf(stderr, "\t%s\n", main_cmds.names[i]->name); | |
115 | } | |
682f4f03 | 116 | end: |
5feaac24 JP |
117 | exit(1); |
118 | } |