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