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