dmenu_path.c
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/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
static void die(const char *s);
static int qstrcmp(const void *a, const void *b);
static void scan(void);
static int uptodate(void);
static char **items = NULL;
static const char *home, *path;
int
main(void) {
if(!(home = getenv("HOME")))
die("no $HOME");
if(!(path = getenv("PATH")))
die("no $PATH");
if(chdir(home) < 0)
die("chdir failed");
if(uptodate()) {
execl("/bin/cat", "cat", CACHE, NULL);
die("exec failed");
}
scan();
return EXIT_SUCCESS;
}
void
die(const char *s) {
fprintf(stderr, "dmenu_path: %s\n", s);
exit(EXIT_FAILURE);
}
int
qstrcmp(const void *a, const void *b) {
return strcmp(*(const char **)a, *(const char **)b);
}
void
scan(void) {
char buf[PATH_MAX];
char *dir, *p;
size_t i, count;
struct dirent *ent;
DIR *dp;
FILE *cache;
count = 0;
if(!(p = strdup(path)))
die("strdup failed");
for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":")) {
if(!(dp = opendir(dir)))
continue;
while((ent = readdir(dp))) {
snprintf(buf, sizeof buf, "%s/%s", dir, ent->d_name);
if(ent->d_name[0] == '.' || access(buf, X_OK) < 0)
continue;
if(!(items = realloc(items, ++count * sizeof *items)))
die("malloc failed");
if(!(items[count-1] = strdup(ent->d_name)))
die("strdup failed");
}
closedir(dp);
}
qsort(items, count, sizeof *items, qstrcmp);
if(!(cache = fopen(CACHE, "w")))
die("open failed");
for(i = 0; i < count; i++) {
if(i > 0 && !strcmp(items[i], items[i-1]))
continue;
fprintf(cache, "%s\n", items[i]);
fprintf(stdout, "%s\n", items[i]);
}
fclose(cache);
free(p);
}
int
uptodate(void) {
char *dir, *p;
time_t mtime;
struct stat st;
if(stat(CACHE, &st) < 0)
return 0;
mtime = st.st_mtime;
if(!(p = strdup(path)))
die("strdup failed");
for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":"))
if(!stat(dir, &st) && st.st_mtime > mtime)
return 0;
free(p);
return 1;
}