1#include "cache.h"
2#include "../builtin.h"
3#include "exec_cmd.h"
4#include "levenshtein.h"
5#include "help.h"
6#include <termios.h>
7
8void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
9{
10 struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
11
12 ent->len = len;
13 memcpy(ent->name, name, len);
14 ent->name[len] = 0;
15
16 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
17 cmds->names[cmds->cnt++] = ent;
18}
19
20static void clean_cmdnames(struct cmdnames *cmds)
21{
22 unsigned int i;
23
24 for (i = 0; i < cmds->cnt; ++i)
25 free(cmds->names[i]);
26 free(cmds->names);
27 cmds->cnt = 0;
28 cmds->alloc = 0;
29}
30
31static int cmdname_compare(const void *a_, const void *b_)
32{
33 struct cmdname *a = *(struct cmdname **)a_;
34 struct cmdname *b = *(struct cmdname **)b_;
35 return strcmp(a->name, b->name);
36}
37
38static void uniq(struct cmdnames *cmds)
39{
40 unsigned int i, j;
41
42 if (!cmds->cnt)
43 return;
44
45 for (i = j = 1; i < cmds->cnt; i++)
46 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
47 cmds->names[j++] = cmds->names[i];
48
49 cmds->cnt = j;
50}
51
52void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
53{
54 size_t ci, cj, ei;
55 int cmp;
56
57 ci = cj = ei = 0;
58 while (ci < cmds->cnt && ei < excludes->cnt) {
59 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
60 if (cmp < 0)
61 cmds->names[cj++] = cmds->names[ci++];
62 else if (cmp == 0)
63 ci++, ei++;
64 else if (cmp > 0)
65 ei++;
66 }
67
68 while (ci < cmds->cnt)
69 cmds->names[cj++] = cmds->names[ci++];
70
71 cmds->cnt = cj;
72}
73
74static void pretty_print_string_list(struct cmdnames *cmds, int longest)
75{
76 int cols = 1, rows;
77 int space = longest + 1;
78 struct winsize win;
79 int max_cols;
80 int i, j;
81
82 get_term_dimensions(&win);
83 max_cols = win.ws_col - 1;
84
85 if (space < max_cols)
86 cols = max_cols / space;
87 rows = (cmds->cnt + cols - 1) / cols;
88
89 for (i = 0; i < rows; i++) {
90 printf(" ");
91
92 for (j = 0; j < cols; j++) {
93 unsigned int n = j * rows + i;
94 unsigned int size = space;
95
96 if (n >= cmds->cnt)
97 break;
98 if (j == cols-1 || n + rows >= cmds->cnt)
99 size = 1;
100 printf("%-*s", size, cmds->names[n]->name);
101 }
102 putchar('\n');
103 }
104}
105
106static int is_executable(const char *name)
107{
108 struct stat st;
109
110 if (stat(name, &st) ||
111 !S_ISREG(st.st_mode))
112 return 0;
113
114 return st.st_mode & S_IXUSR;
115}
116
117static void list_commands_in_dir(struct cmdnames *cmds,
118 const char *path,
119 const char *prefix)
120{
121 int prefix_len;
122 DIR *dir = opendir(path);
123 struct dirent *de;
124 struct strbuf buf = STRBUF_INIT;
125 int len;
126
127 if (!dir)
128 return;
129 if (!prefix)
130 prefix = "perf-";
131 prefix_len = strlen(prefix);
132
133 strbuf_addf(&buf, "%s/", path);
134 len = buf.len;
135
136 while ((de = readdir(dir)) != NULL) {
137 int entlen;
138
139 if (prefixcmp(de->d_name, prefix))
140 continue;
141
142 strbuf_setlen(&buf, len);
143 strbuf_addstr(&buf, de->d_name);
144 if (!is_executable(buf.buf))
145 continue;
146
147 entlen = strlen(de->d_name) - prefix_len;
148 if (has_extension(de->d_name, ".exe"))
149 entlen -= 4;
150
151 add_cmdname(cmds, de->d_name + prefix_len, entlen);
152 }
153 closedir(dir);
154 strbuf_release(&buf);
155}
156
157void load_command_list(const char *prefix,
158 struct cmdnames *main_cmds,
159 struct cmdnames *other_cmds)
160{
161 const char *env_path = getenv("PATH");
162 const char *exec_path = perf_exec_path();
163
164 if (exec_path) {
165 list_commands_in_dir(main_cmds, exec_path, prefix);
166 qsort(main_cmds->names, main_cmds->cnt,
167 sizeof(*main_cmds->names), cmdname_compare);
168 uniq(main_cmds);
169 }
170
171 if (env_path) {
172 char *paths, *path, *colon;
173 path = paths = strdup(env_path);
174 while (1) {
175 if ((colon = strchr(path, PATH_SEP)))
176 *colon = 0;
177 if (!exec_path || strcmp(path, exec_path))
178 list_commands_in_dir(other_cmds, path, prefix);
179
180 if (!colon)
181 break;
182 path = colon + 1;
183 }
184 free(paths);
185
186 qsort(other_cmds->names, other_cmds->cnt,
187 sizeof(*other_cmds->names), cmdname_compare);
188 uniq(other_cmds);
189 }
190 exclude_cmds(other_cmds, main_cmds);
191}
192
193void list_commands(const char *title, struct cmdnames *main_cmds,
194 struct cmdnames *other_cmds)
195{
196 unsigned int i, longest = 0;
197
198 for (i = 0; i < main_cmds->cnt; i++)
199 if (longest < main_cmds->names[i]->len)
200 longest = main_cmds->names[i]->len;
201 for (i = 0; i < other_cmds->cnt; i++)
202 if (longest < other_cmds->names[i]->len)
203 longest = other_cmds->names[i]->len;
204
205 if (main_cmds->cnt) {
206 const char *exec_path = perf_exec_path();
207 printf("available %s in '%s'\n", title, exec_path);
208 printf("----------------");
209 mput_char('-', strlen(title) + strlen(exec_path));
210 putchar('\n');
211 pretty_print_string_list(main_cmds, longest);
212 putchar('\n');
213 }
214
215 if (other_cmds->cnt) {
216 printf("%s available from elsewhere on your $PATH\n", title);
217 printf("---------------------------------------");
218 mput_char('-', strlen(title));
219 putchar('\n');
220 pretty_print_string_list(other_cmds, longest);
221 putchar('\n');
222 }
223}
224
225int is_in_cmdlist(struct cmdnames *c, const char *s)
226{
227 unsigned int i;
228
229 for (i = 0; i < c->cnt; i++)
230 if (!strcmp(s, c->names[i]->name))
231 return 1;
232 return 0;
233}
234
235static int autocorrect;
236static struct cmdnames aliases;
237
238static int perf_unknown_cmd_config(const char *var, const char *value, void *cb)
239{
240 if (!strcmp(var, "help.autocorrect"))
241 autocorrect = perf_config_int(var,value);
242
243 if (!prefixcmp(var, "alias."))
244 add_cmdname(&aliases, var + 6, strlen(var + 6));
245
246 return perf_default_config(var, value, cb);
247}
248
249static int levenshtein_compare(const void *p1, const void *p2)
250{
251 const struct cmdname *const *c1 = p1, *const *c2 = p2;
252 const char *s1 = (*c1)->name, *s2 = (*c2)->name;
253 int l1 = (*c1)->len;
254 int l2 = (*c2)->len;
255 return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
256}
257
258static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
259{
260 unsigned int i;
261
262 ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
263
264 for (i = 0; i < old->cnt; i++)
265 cmds->names[cmds->cnt++] = old->names[i];
266 free(old->names);
267 old->cnt = 0;
268 old->names = NULL;
269}
270
271const char *help_unknown_cmd(const char *cmd)
272{
273 unsigned int i, n = 0, best_similarity = 0;
274 struct cmdnames main_cmds, other_cmds;
275
276 memset(&main_cmds, 0, sizeof(main_cmds));
277 memset(&other_cmds, 0, sizeof(main_cmds));
278 memset(&aliases, 0, sizeof(aliases));
279
280 perf_config(perf_unknown_cmd_config, NULL);
281
282 load_command_list("perf-", &main_cmds, &other_cmds);
283
284 add_cmd_list(&main_cmds, &aliases);
285 add_cmd_list(&main_cmds, &other_cmds);
286 qsort(main_cmds.names, main_cmds.cnt,
287 sizeof(main_cmds.names), cmdname_compare);
288 uniq(&main_cmds);
289
290 if (main_cmds.cnt) {
291
292 for (i = 0; i < main_cmds.cnt; ++i)
293 main_cmds.names[i]->len =
294 levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
295
296 qsort(main_cmds.names, main_cmds.cnt,
297 sizeof(*main_cmds.names), levenshtein_compare);
298
299 best_similarity = main_cmds.names[0]->len;
300 n = 1;
301 while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
302 ++n;
303 }
304
305 if (autocorrect && n == 1) {
306 const char *assumed = main_cmds.names[0]->name;
307
308 main_cmds.names[0] = NULL;
309 clean_cmdnames(&main_cmds);
310 fprintf(stderr, "WARNING: You called a perf program named '%s', "
311 "which does not exist.\n"
312 "Continuing under the assumption that you meant '%s'\n",
313 cmd, assumed);
314 if (autocorrect > 0) {
315 fprintf(stderr, "in %0.1f seconds automatically...\n",
316 (float)autocorrect/10.0);
317 poll(NULL, 0, autocorrect * 100);
318 }
319 return assumed;
320 }
321
322 fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
323
324 if (main_cmds.cnt && best_similarity < 6) {
325 fprintf(stderr, "\nDid you mean %s?\n",
326 n < 2 ? "this": "one of these");
327
328 for (i = 0; i < n; i++)
329 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
330 }
331
332 exit(1);
333}
334
335int cmd_version(int argc __maybe_unused, const char **argv __maybe_unused,
336 const char *prefix __maybe_unused)
337{
338 printf("perf version %s\n", perf_version_string);
339 return 0;
340}
341
