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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> |
4b6ab94e | 6 | #include <subcmd/help.h> |
5feaac24 JP |
7 | #include "../builtin.h" |
8 | #include "levenshtein.h" | |
9 | ||
10 | static int autocorrect; | |
5feaac24 | 11 | |
b8cbb349 WN |
12 | static int perf_unknown_cmd_config(const char *var, const char *value, |
13 | void *cb __maybe_unused) | |
5feaac24 JP |
14 | { |
15 | if (!strcmp(var, "help.autocorrect")) | |
25ce4bb8 | 16 | return perf_config_int(&autocorrect, var,value); |
5feaac24 | 17 | |
b8cbb349 | 18 | return 0; |
5feaac24 JP |
19 | } |
20 | ||
21 | static int levenshtein_compare(const void *p1, const void *p2) | |
22 | { | |
23 | const struct cmdname *const *c1 = p1, *const *c2 = p2; | |
24 | const char *s1 = (*c1)->name, *s2 = (*c2)->name; | |
25 | int l1 = (*c1)->len; | |
26 | int l2 = (*c2)->len; | |
27 | return l1 != l2 ? l1 - l2 : strcmp(s1, s2); | |
28 | } | |
29 | ||
682f4f03 | 30 | static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old) |
5feaac24 | 31 | { |
682f4f03 MH |
32 | unsigned int i, nr = cmds->cnt + old->cnt; |
33 | void *tmp; | |
34 | ||
35 | if (nr > cmds->alloc) { | |
36 | /* Choose bigger one to alloc */ | |
37 | if (alloc_nr(cmds->alloc) < nr) | |
38 | cmds->alloc = nr; | |
39 | else | |
40 | cmds->alloc = alloc_nr(cmds->alloc); | |
41 | tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names)); | |
42 | if (!tmp) | |
43 | return -1; | |
44 | cmds->names = tmp; | |
45 | } | |
5feaac24 JP |
46 | for (i = 0; i < old->cnt; i++) |
47 | cmds->names[cmds->cnt++] = old->names[i]; | |
48 | zfree(&old->names); | |
49 | old->cnt = 0; | |
682f4f03 | 50 | return 0; |
5feaac24 JP |
51 | } |
52 | ||
53 | const char *help_unknown_cmd(const char *cmd) | |
54 | { | |
55 | unsigned int i, n = 0, best_similarity = 0; | |
56 | struct cmdnames main_cmds, other_cmds; | |
57 | ||
58 | memset(&main_cmds, 0, sizeof(main_cmds)); | |
59 | memset(&other_cmds, 0, sizeof(main_cmds)); | |
5feaac24 JP |
60 | |
61 | perf_config(perf_unknown_cmd_config, NULL); | |
62 | ||
63 | load_command_list("perf-", &main_cmds, &other_cmds); | |
64 | ||
c6867701 | 65 | if (add_cmd_list(&main_cmds, &other_cmds) < 0) { |
682f4f03 MH |
66 | fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n"); |
67 | goto end; | |
68 | } | |
5feaac24 JP |
69 | qsort(main_cmds.names, main_cmds.cnt, |
70 | sizeof(main_cmds.names), cmdname_compare); | |
71 | uniq(&main_cmds); | |
72 | ||
73 | if (main_cmds.cnt) { | |
74 | /* This reuses cmdname->len for similarity index */ | |
75 | for (i = 0; i < main_cmds.cnt; ++i) | |
76 | main_cmds.names[i]->len = | |
77 | levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4); | |
78 | ||
79 | qsort(main_cmds.names, main_cmds.cnt, | |
80 | sizeof(*main_cmds.names), levenshtein_compare); | |
81 | ||
82 | best_similarity = main_cmds.names[0]->len; | |
83 | n = 1; | |
84 | while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len) | |
85 | ++n; | |
86 | } | |
87 | ||
88 | if (autocorrect && n == 1) { | |
89 | const char *assumed = main_cmds.names[0]->name; | |
90 | ||
91 | main_cmds.names[0] = NULL; | |
92 | clean_cmdnames(&main_cmds); | |
93 | fprintf(stderr, "WARNING: You called a perf program named '%s', " | |
94 | "which does not exist.\n" | |
95 | "Continuing under the assumption that you meant '%s'\n", | |
96 | cmd, assumed); | |
97 | if (autocorrect > 0) { | |
98 | fprintf(stderr, "in %0.1f seconds automatically...\n", | |
99 | (float)autocorrect/10.0); | |
100 | poll(NULL, 0, autocorrect * 100); | |
101 | } | |
102 | return assumed; | |
103 | } | |
104 | ||
105 | fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd); | |
106 | ||
107 | if (main_cmds.cnt && best_similarity < 6) { | |
108 | fprintf(stderr, "\nDid you mean %s?\n", | |
109 | n < 2 ? "this": "one of these"); | |
110 | ||
111 | for (i = 0; i < n; i++) | |
112 | fprintf(stderr, "\t%s\n", main_cmds.names[i]->name); | |
113 | } | |
682f4f03 | 114 | end: |
5feaac24 JP |
115 | exit(1); |
116 | } |