1#include <stdio.h>
2#include <stdlib.h>
3
4#include <uv.h>
5
6uv_loop_t *loop;
7const char *command;
8
9void run_command(uv_fs_event_t *handle, const char *filename, int events, int status) {
10    char path[1024];
11    size_t size = 1023;
12    // Does not handle error if path is longer than 1023.
13    uv_fs_event_getpath(handle, path, &size);
14    path[size] = '\0';
15
16    fprintf(stderr, "Change detected in %s: ", path);
17    if (events & UV_RENAME)
18        fprintf(stderr, "renamed");
19    if (events & UV_CHANGE)
20        fprintf(stderr, "changed");
21
22    fprintf(stderr, " %s\n", filename ? filename : "");
23    system(command);
24}
25
26int main(int argc, char **argv) {
27    if (argc <= 2) {
28        fprintf(stderr, "Usage: %s <command> <file1> [file2 ...]\n", argv[0]);
29        return 1;
30    }
31
32    loop = uv_default_loop();
33    command = argv[1];
34
35    while (argc-- > 2) {
36        fprintf(stderr, "Adding watch on %s\n", argv[argc]);
37        uv_fs_event_t *fs_event_req = malloc(sizeof(uv_fs_event_t));
38        uv_fs_event_init(loop, fs_event_req);
39        // The recursive flag watches subdirectories too.
40        uv_fs_event_start(fs_event_req, run_command, argv[argc], UV_FS_EVENT_RECURSIVE);
41    }
42
43    return uv_run(loop, UV_RUN_DEFAULT);
44}
45