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 #define CACHE ".dmenu_cache"
  11
  12 static void die(const char *s);
  13 static int qstrcmp(const void *a, const void *b);
  14 static void scan(void);
  15 static int uptodate(void);
  16
  17 static char **items = NULL;
  18 static const char *home, *path;
  19
  20 int
  21 main(void) {
  22         if(!(home = getenv("HOME")))
  23                 die("no $HOME");
  24         if(!(path = getenv("PATH")))
  25                 die("no $PATH");
  26         if(chdir(home) < 0)
  27                 die("chdir failed");
  28         if(uptodate()) {
  29                 execlp("cat", "cat", CACHE, NULL);
  30                 die("exec failed");
  31         }
  32         scan();
  33         return EXIT_SUCCESS;
  34 }
  35
  36 void
  37 die(const char *s) {
  38         fprintf(stderr, "dmenu_path: %s\n", s);
  39         exit(EXIT_FAILURE);
  40 }
  41
  42 int
  43 qstrcmp(const void *a, const void *b) {
  44         return strcmp(*(const char **)a, *(const char **)b);
  45 }
  46
  47 void
  48 scan(void) {
  49         char buf[PATH_MAX];
  50         char *dir, *p;
  51         size_t i, count;
  52         struct dirent *ent;
  53         DIR *dp;
  54         FILE *cache;
  55
  56         count = 0;
  57         if(!(p = strdup(path)))
  58                 die("strdup failed");
  59         for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":")) {
  60                 if(!(dp = opendir(dir)))
  61                         continue;
  62                 while((ent = readdir(dp))) {
  63                         snprintf(buf, sizeof buf, "%s/%s", dir, ent->d_name);
  64                         if(ent->d_name[0] == '.' || access(buf, X_OK) < 0)
  65                                 continue;
  66                         if(!(items = realloc(items, ++count * sizeof *items)))
  67                                 die("malloc failed");
  68                         if(!(items[count-1] = strdup(ent->d_name)))
  69                                 die("strdup failed");
  70                 }
  71                 closedir(dp);
  72         }
  73         qsort(items, count, sizeof *items, qstrcmp);
  74         if(!(cache = fopen(CACHE, "w")))
  75                 die("open failed");
  76         for(i = 0; i < count; i++) {
  77                 if(i > 0 && !strcmp(items[i], items[i-1]))
  78                         continue;
  79                 fprintf(cache,  "%s\n", items[i]);
  80                 fprintf(stdout, "%s\n", items[i]);
  81         }
  82         fclose(cache);
  83         free(p);
  84 }
  85
  86 int
  87 uptodate(void) {
  88         char *dir, *p;
  89         time_t mtime;
  90         struct stat st;
  91
  92         if(stat(CACHE, &st) < 0)
  93                 return 0;
  94         mtime = st.st_mtime;
  95         if(!(p = strdup(path)))
  96                 die("strdup failed");
  97         for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":"))
  98                 if(!stat(dir, &st) && st.st_mtime > mtime)
  99                         return 0;
 100         free(p);
 101         return 1;
 102 }