Luna/utils/stat.cpp

#include <os/ArgumentParser.h>
#include <os/FileSystem.h>
#include <os/Mode.h>
#include <stdio.h>
#include <time.h>

static const char* file_type(mode_t mode)
{
    switch (mode & S_IFMT)
    {
    case S_IFREG: return "regular file";
    case S_IFDIR: return "directory";
    case S_IFCHR: return "character special device";
    case S_IFBLK: return "block special device";
    case S_IFLNK: return "symbolic link";
    case S_IFIFO: return "pipe";
    case S_IFSOCK: return "socket";
    default: return "unknown file type";
    }
}

Result<int> luna_main(int argc, char** argv)
{
    StringView path;
    bool follow_symlinks { false };

    os::ArgumentParser parser;
    parser.add_description("Display file metadata.");
    parser.add_system_program_info("stat"_sv);
    parser.add_positional_argument(path, "path", true);
    parser.add_switch_argument(follow_symlinks, 'L', "dereference"_sv, "follow symlinks");
    parser.parse(argc, argv);

    struct stat st;
    TRY(os::FileSystem::stat(path, st, follow_symlinks));

    char buf[11];
    os::format_mode(st.st_mode, buf);

    char atime[256];
    strftime(atime, sizeof(atime), "%Y-%m-%d %H:%M:%S", gmtime(&st.st_atim.tv_sec));
    char mtime[256];
    strftime(mtime, sizeof(mtime), "%Y-%m-%d %H:%M:%S", gmtime(&st.st_mtim.tv_sec));
    char ctime[256];
    strftime(ctime, sizeof(ctime), "%Y-%m-%d %H:%M:%S", gmtime(&st.st_ctim.tv_sec));

    printf("  File: %s\n", path.chars());
    printf("  Size: %zu (%s)\n", st.st_size, file_type(st.st_mode));
    printf(" Inode: %lu Links: %lu\n", st.st_ino, st.st_nlink);
    printf("  Mode: (%#o/%s) UID: %u GID: %u\n", st.st_mode & ~S_IFMT, buf, st.st_uid, st.st_gid);
    printf("Access: %s.%.9ld\n", atime, st.st_atim.tv_nsec);
    printf("Modify: %s.%.9ld\n", mtime, st.st_mtim.tv_nsec);
    printf("Change: %s.%.9ld\n", ctime, st.st_ctim.tv_nsec);

    return 0;
}