dmenu_path.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <dirent.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <sys/stat.h>
   9
  10 static void die(const char *s);
  11 static int qstrcmp(const void *a, const void *b);
  12 static void scan(void);
  13 static int uptodate(void);
  14
  15 static char **items = NULL;
  16 static const char *home, *path;
  17
  18 int
  19 main(void) {
  20         if(!(home = getenv("HOME")))
  21                 die("no $HOME");
  22         if(!(path = getenv("PATH")))
  23                 die("no $PATH");
  24         if(chdir(home) < 0)
  25                 die("chdir failed");
  26         if(uptodate()) {
  27                 execl("/bin/cat", "cat", CACHE, NULL);
  28                 die("exec failed");
  29         }
  30         scan();
  31         return EXIT_SUCCESS;
  32 }
  33
  34 void
  35 die(const char *s) {
  36         fprintf(stderr, "dmenu_path: %s\n", s);
  37         exit(EXIT_FAILURE);
  38 }
  39
  40 int
  41 qstrcmp(const void *a, const void *b) {
  42         return strcmp(*(const char **)a, *(const char **)b);
  43 }
  44
  45 void
  46 scan(void) {
  47         char buf[PATH_MAX];
  48         char *dir, *p;
  49         size_t i, count;
  50         struct dirent *ent;
  51         DIR *dp;
  52         FILE *cache;
  53
  54         count = 0;
  55         if(!(p = strdup(path)))
  56                 die("strdup failed");
  57         for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":")) {
  58                 if(!(dp = opendir(dir)))
  59                         continue;
  60                 while((ent = readdir(dp))) {
  61                         snprintf(buf, sizeof buf, "%s/%s", dir, ent->d_name);
  62                         if(ent->d_name[0] == '.' || access(buf, X_OK) < 0)
  63                                 continue;
  64                         if(!(items = realloc(items, ++count * sizeof *items)))
  65                                 die("malloc failed");
  66                         if(!(items[count-1] = strdup(ent->d_name)))
  67                                 die("strdup failed");
  68                 }
  69                 closedir(dp);
  70         }
  71         qsort(items, count, sizeof *items, qstrcmp);
  72         if(!(cache = fopen(CACHE, "w")))
  73                 die("open failed");
  74         for(i = 0; i < count; i++) {
  75                 if(i > 0 && !strcmp(items[i], items[i-1]))
  76                         continue;
  77                 fprintf(cache,  "%s\n", items[i]);
  78                 fprintf(stdout, "%s\n", items[i]);
  79         }
  80         fclose(cache);
  81         free(p);
  82 }
  83
  84 int
  85 uptodate(void) {
  86         char *dir, *p;
  87         time_t mtime;
  88         struct stat st;
  89
  90         if(stat(CACHE, &st) < 0)
  91                 return 0;
  92         mtime = st.st_mtime;
  93         if(!(p = strdup(path)))
  94                 die("strdup failed");
  95         for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":"))
  96                 if(!stat(dir, &st) && st.st_mtime > mtime)
  97                         return 0;
  98         free(p);
  99         return 1;
 100 }