tools/lib/subcmd/help.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <termios.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <unistd.h>
   9 #include <dirent.h>
  10 #include "subcmd-util.h"
  11 #include "help.h"
  12 #include "exec-cmd.h"
  13
  14 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
  15 {
  16         struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
  17
  18         ent->len = len;
  19         memcpy(ent->name, name, len);
  20         ent->name[len] = 0;
  21
  22         ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
  23         cmds->names[cmds->cnt++] = ent;
  24 }
  25
  26 void clean_cmdnames(struct cmdnames *cmds)
  27 {
  28         unsigned int i;
  29
  30         for (i = 0; i < cmds->cnt; ++i)
  31                 zfree(&cmds->names[i]);
  32         zfree(&cmds->names);
  33         cmds->cnt = 0;
  34         cmds->alloc = 0;
  35 }
  36
  37 int cmdname_compare(const void *a_, const void *b_)
  38 {
  39         struct cmdname *a = *(struct cmdname **)a_;
  40         struct cmdname *b = *(struct cmdname **)b_;
  41         return strcmp(a->name, b->name);
  42 }
  43
  44 void uniq(struct cmdnames *cmds)
  45 {
  46         unsigned int i, j;
  47
  48         if (!cmds->cnt)
  49                 return;
  50
  51         for (i = j = 1; i < cmds->cnt; i++)
  52                 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
  53                         cmds->names[j++] = cmds->names[i];
  54
  55         cmds->cnt = j;
  56 }
  57
  58 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
  59 {
  60         size_t ci, cj, ei;
  61         int cmp;
  62
  63         ci = cj = ei = 0;
  64         while (ci < cmds->cnt && ei < excludes->cnt) {
  65                 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
  66                 if (cmp < 0)
  67                         cmds->names[cj++] = cmds->names[ci++];
  68                 else if (cmp == 0)
  69                         ci++, ei++;
  70                 else if (cmp > 0)
  71                         ei++;
  72         }
  73
  74         while (ci < cmds->cnt)
  75                 cmds->names[cj++] = cmds->names[ci++];
  76
  77         cmds->cnt = cj;
  78 }
  79
  80 static void get_term_dimensions(struct winsize *ws)
  81 {
  82         char *s = getenv("LINES");
  83
  84         if (s != NULL) {
  85                 ws->ws_row = atoi(s);
  86                 s = getenv("COLUMNS");
  87                 if (s != NULL) {
  88                         ws->ws_col = atoi(s);
  89                         if (ws->ws_row && ws->ws_col)
  90                                 return;
  91                 }
  92         }
  93 #ifdef TIOCGWINSZ
  94         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
  95             ws->ws_row && ws->ws_col)
  96                 return;
  97 #endif
  98         ws->ws_row = 25;
  99         ws->ws_col = 80;
 100 }
 101
 102 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
 103 {
 104         int cols = 1, rows;
 105         int space = longest + 1; /* min 1 SP between words */
 106         struct winsize win;
 107         int max_cols;
 108         int i, j;
 109
 110         get_term_dimensions(&win);
 111         max_cols = win.ws_col - 1; /* don't print *on* the edge */
 112
 113         if (space < max_cols)
 114                 cols = max_cols / space;
 115         rows = (cmds->cnt + cols - 1) / cols;
 116
 117         for (i = 0; i < rows; i++) {
 118                 printf("  ");
 119
 120                 for (j = 0; j < cols; j++) {
 121                         unsigned int n = j * rows + i;
 122                         unsigned int size = space;
 123
 124                         if (n >= cmds->cnt)
 125                                 break;
 126                         if (j == cols-1 || n + rows >= cmds->cnt)
 127                                 size = 1;
 128                         printf("%-*s", size, cmds->names[n]->name);
 129                 }
 130                 putchar('\n');
 131         }
 132 }
 133
 134 static int is_executable(const char *name)
 135 {
 136         struct stat st;
 137
 138         if (stat(name, &st) || /* stat, not lstat */
 139             !S_ISREG(st.st_mode))
 140                 return 0;
 141
 142         return st.st_mode & S_IXUSR;
 143 }
 144
 145 static int has_extension(const char *filename, const char *ext)
 146 {
 147         size_t len = strlen(filename);
 148         size_t extlen = strlen(ext);
 149
 150         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 151 }
 152
 153 static void list_commands_in_dir(struct cmdnames *cmds,
 154                                          const char *path,
 155                                          const char *prefix)
 156 {
 157         int prefix_len;
 158         DIR *dir = opendir(path);
 159         struct dirent *de;
 160         char *buf = NULL;
 161
 162         if (!dir)
 163                 return;
 164         if (!prefix)
 165                 prefix = "perf-";
 166         prefix_len = strlen(prefix);
 167
 168         astrcatf(&buf, "%s/", path);
 169
 170         while ((de = readdir(dir)) != NULL) {
 171                 int entlen;
 172
 173                 if (prefixcmp(de->d_name, prefix))
 174                         continue;
 175
 176                 astrcat(&buf, de->d_name);
 177                 if (!is_executable(buf))
 178                         continue;
 179
 180                 entlen = strlen(de->d_name) - prefix_len;
 181                 if (has_extension(de->d_name, ".exe"))
 182                         entlen -= 4;
 183
 184                 add_cmdname(cmds, de->d_name + prefix_len, entlen);
 185         }
 186         closedir(dir);
 187         free(buf);
 188 }
 189
 190 void load_command_list(const char *prefix,
 191                 struct cmdnames *main_cmds,
 192                 struct cmdnames *other_cmds)
 193 {
 194         const char *env_path = getenv("PATH");
 195         char *exec_path = get_argv_exec_path();
 196
 197         if (exec_path) {
 198                 list_commands_in_dir(main_cmds, exec_path, prefix);
 199                 qsort(main_cmds->names, main_cmds->cnt,
 200                       sizeof(*main_cmds->names), cmdname_compare);
 201                 uniq(main_cmds);
 202         }
 203
 204         if (env_path) {
 205                 char *paths, *path, *colon;
 206                 path = paths = strdup(env_path);
 207                 while (1) {
 208                         if ((colon = strchr(path, ':')))
 209                                 *colon = 0;
 210                         if (!exec_path || strcmp(path, exec_path))
 211                                 list_commands_in_dir(other_cmds, path, prefix);
 212
 213                         if (!colon)
 214                                 break;
 215                         path = colon + 1;
 216                 }
 217                 free(paths);
 218
 219                 qsort(other_cmds->names, other_cmds->cnt,
 220                       sizeof(*other_cmds->names), cmdname_compare);
 221                 uniq(other_cmds);
 222         }
 223         free(exec_path);
 224         exclude_cmds(other_cmds, main_cmds);
 225 }
 226
 227 void list_commands(const char *title, struct cmdnames *main_cmds,
 228                    struct cmdnames *other_cmds)
 229 {
 230         unsigned int i, longest = 0;
 231
 232         for (i = 0; i < main_cmds->cnt; i++)
 233                 if (longest < main_cmds->names[i]->len)
 234                         longest = main_cmds->names[i]->len;
 235         for (i = 0; i < other_cmds->cnt; i++)
 236                 if (longest < other_cmds->names[i]->len)
 237                         longest = other_cmds->names[i]->len;
 238
 239         if (main_cmds->cnt) {
 240                 char *exec_path = get_argv_exec_path();
 241                 printf("available %s in '%s'\n", title, exec_path);
 242                 printf("----------------");
 243                 mput_char('-', strlen(title) + strlen(exec_path));
 244                 putchar('\n');
 245                 pretty_print_string_list(main_cmds, longest);
 246                 putchar('\n');
 247                 free(exec_path);
 248         }
 249
 250         if (other_cmds->cnt) {
 251                 printf("%s available from elsewhere on your $PATH\n", title);
 252                 printf("---------------------------------------");
 253                 mput_char('-', strlen(title));
 254                 putchar('\n');
 255                 pretty_print_string_list(other_cmds, longest);
 256                 putchar('\n');
 257         }
 258 }
 259
 260 int is_in_cmdlist(struct cmdnames *c, const char *s)
 261 {
 262         unsigned int i;
 263
 264         for (i = 0; i < c->cnt; i++)
 265                 if (!strcmp(s, c->names[i]->name))
 266                         return 1;
 267         return 0;
 268 }