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/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2022 Roger Knecht <rknecht@pm.me>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config TREE
//config: bool "tree (0.6 kb)"
//config: default y
//config: help
//config: List files and directories in a tree structure.
//applet:IF_TREE(APPLET(tree, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_TREE) += tree.o
//usage:#define tree_trivial_usage NOUSAGE_STR
//usage:#define tree_full_usage ""
#include "libbb.h"
#include "common_bufsiz.h"
#define prefix_buf bb_common_bufsiz1
static void tree_print(unsigned count[2], const char* directory_name, char* prefix_pos)
{
struct dirent **entries;
int index, size;
// read directory entries
size = scandir(directory_name, &entries, NULL, alphasort);
if (size < 0) {
fputs_stdout(directory_name);
puts(" [error opening dir]");
return;
}
// print directory name
puts(directory_name);
// switch to sub directory
xchdir(directory_name);
// print all directory entries
for (index = 0; index < size;) {
struct dirent *dirent = entries[index++];
// filter hidden files and directories
if (dirent->d_name[0] != '.') {
int status;
struct stat statBuf;
//TODO: when -l is implemented, use stat, not lstat, if -l
status = lstat(dirent->d_name, &statBuf);
if (index == size) {
strcpy(prefix_pos, "└── ");
} else {
strcpy(prefix_pos, "├── ");
}
fputs_stdout(prefix_buf);
if (status == 0 && S_ISLNK(statBuf.st_mode)) {
// handle symlink
char* symlink_path = xmalloc_readlink(dirent->d_name);
printf("%s -> %s\n", dirent->d_name, symlink_path);
free(symlink_path);
count[1]++;
} else if (status == 0 && S_ISDIR(statBuf.st_mode)
&& (prefix_pos - prefix_buf) < (COMMON_BUFSIZE - 16)
) {
// handle directory
char* pos;
if (index == size) {
pos = stpcpy(prefix_pos, " ");
} else {
pos = stpcpy(prefix_pos, "│ ");
}
tree_print(count, dirent->d_name, pos);
count[0]++;
} else {
// handle file
puts(dirent->d_name);
count[1]++;
}
}
// release directory entry
free(dirent);
}
// release directory array
free(entries);
// switch to parent directory
xchdir("..");
}
int tree_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tree_main(int argc UNUSED_PARAM, char **argv)
{
unsigned count[2] = { 0, 0 };
setup_common_bufsiz();
if (!argv[1])
*argv-- = (char*)".";
// list directories given as command line arguments
while (*(++argv))
tree_print(count, *argv, prefix_buf);
// print statistic
printf("\n%u directories, %u files\n", count[0], count[1]);
return EXIT_SUCCESS;
}
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