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package os
import "core:container/queue"
/*
A recursive directory walker.
Note that none of the fields should be accessed directly.
*/
Walker :: struct {
todo: queue.Queue(string),
skip_dir: bool,
err: struct {
path: [dynamic]byte,
err: Error,
},
iter: Read_Directory_Iterator,
}
walker_init_path :: proc(w: ^Walker, path: string) {
cloned_path, err := clone_string(path, file_allocator())
if err != nil {
walker_set_error(w, path, err)
return
}
walker_clear(w)
if _, err = queue.push(&w.todo, cloned_path); err != nil {
walker_set_error(w, cloned_path, err)
return
}
}
walker_init_file :: proc(w: ^Walker, f: ^File) {
handle, err := clone(f)
if err != nil {
path, _ := clone_string(name(f), file_allocator())
walker_set_error(w, path, err)
return
}
walker_clear(w)
read_directory_iterator_init(&w.iter, handle)
}
/*
Initializes a walker, either using a path or a file pointer to a directory the walker will start at.
You are allowed to repeatedly call this to reuse it for later walks.
For an example on how to use the walker, see `walker_walk`.
*/
walker_init :: proc {
walker_init_path,
walker_init_file,
}
@(require_results)
walker_create_path :: proc(path: string) -> (w: Walker) {
walker_init_path(&w, path)
return
}
@(require_results)
walker_create_file :: proc(f: ^File) -> (w: Walker) {
walker_init_file(&w, f)
return
}
/*
Creates a walker, either using a path or a file pointer to a directory the walker will start at.
For an example on how to use the walker, see `walker_walk`.
*/
walker_create :: proc {
walker_create_path,
walker_create_file,
}
/*
Returns the last error that occurred during the walker's operations.
Can be called while iterating, or only at the end to check if anything failed.
*/
@(require_results)
walker_error :: proc(w: ^Walker) -> (path: string, err: Error) {
return string(w.err.path[:]), w.err.err
}
@(private)
walker_set_error :: proc(w: ^Walker, path: string, err: Error) {
if err == nil {
return
}
resize(&w.err.path, len(path))
copy(w.err.path[:], path)
w.err.err = err
}
@(private)
walker_clear :: proc(w: ^Walker) {
w.iter.f = nil
w.skip_dir = false
w.err.path.allocator = file_allocator()
clear(&w.err.path)
w.todo.data.allocator = file_allocator()
for path in queue.pop_front_safe(&w.todo) {
delete(path, file_allocator())
}
}
walker_destroy :: proc(w: ^Walker) {
walker_clear(w)
queue.destroy(&w.todo)
delete(w.err.path)
read_directory_iterator_destroy(&w.iter)
}
// Marks the current directory to be skipped (not entered into).
walker_skip_dir :: proc(w: ^Walker) {
w.skip_dir = true
}
/*
Returns the next file info in the iterator, files are iterated in breadth-first order.
If an error occurred opening a directory, you may get zero'd info struct and
`walker_error` will return the error.
Example:
package main
import "core:fmt"
import "core:strings"
import "core:os"
main :: proc() {
w := os.walker_create("core")
defer os.walker_destroy(&w)
for info in os.walker_walk(&w) {
// Optionally break on the first error:
// _ = walker_error(&w) or_break
// Or, handle error as we go:
if path, err := os.walker_error(&w); err != nil {
fmt.eprintfln("failed walking %s: %s", path, err)
continue
}
// Or, do not handle errors during iteration, and just check the error at the end.
// Skip a directory:
if strings.has_suffix(info.fullpath, ".git") {
os.walker_skip_dir(&w)
continue
}
fmt.printfln("%#v", info)
}
// Handle error if one happened during iteration at the end:
if path, err := os.walker_error(&w); err != nil {
fmt.eprintfln("failed walking %s: %v", path, err)
}
}
*/
@(require_results)
walker_walk :: proc(w: ^Walker) -> (fi: File_Info, ok: bool) {
if w.skip_dir {
w.skip_dir = false
if skip, sok := queue.pop_back_safe(&w.todo); sok {
delete(skip, file_allocator())
}
}
if w.iter.f == nil {
if queue.len(w.todo) == 0 {
return
}
next := queue.pop_front(&w.todo)
handle, err := open(next)
if err != nil {
walker_set_error(w, next, err)
return {}, true
}
read_directory_iterator_init(&w.iter, handle)
delete(next, file_allocator())
}
info, _, iter_ok := read_directory_iterator(&w.iter)
if path, err := read_directory_iterator_error(&w.iter); err != nil {
walker_set_error(w, path, err)
}
if !iter_ok {
close(w.iter.f)
w.iter.f = nil
return walker_walk(w)
}
if info.type == .Directory {
path, err := clone_string(info.fullpath, file_allocator())
if err != nil {
walker_set_error(w, "", err)
return
}
_, err = queue.push_back(&w.todo, path)
if err != nil {
walker_set_error(w, path, err)
return
}
}
return info, iter_ok
}
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