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v/examples/viewer/file_scan.v

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V

/**********************************************************************
*
* File scanner
*
* Copyright (c) 2021 Dario Deledda. All rights reserved.
* Use of this source code is governed by an MIT license
* that can be found in the LICENSE file.
*
* TODO:
**********************************************************************/
import os
// STBI supported format
// STBI_NO_JPEG *
// STBI_NO_PNG *
// STBI_NO_BMP *
// STBI_NO_PSD
// STBI_NO_TGA *
// STBI_NO_GIF *
// STBI_NO_HDR *
// STBI_NO_PIC *
// STBI_NO_PNM *
/******************************************************************************
*
* Struct and Enums
*
******************************************************************************/
enum Item_type {
file = 0
folder
// archive format
zip = 16
archive_file
// graphic format, MUST stay after the other types!!
bmp = 32
jpg
png
gif
tga
ppm
pgm
pic
hdr
}
pub struct Item {
pub mut:
path string
name string
size u64
i_type Item_type = .file
container_index int // used if the item is in a container (.zip, .rar, etc)
container_item_index int // index in the container if the item is contained
need_extract bool // if true need to extraction from the container
drawable bool // if true the image can be showed
n_item int //
rotation int // number of rotation of PI/2
}
struct Item_list {
pub mut:
lst []Item
path_sep string
item_index int = -1 // image currently shown
n_item int // number of images scanned
loaded bool // flag that indicate that the list is ready to be used
}
/******************************************************************************
*
* Utility functions
*
******************************************************************************/
[inline]
fn modulo(x int, n int) int {
return (x % n + n) % n
}
[inline]
fn get_extension(x string) Item_type {
// 4 char extension check
if x.len > 4 {
ext4 := x[x.len - 4..].to_lower()
match ext4 {
// containers
'.zip' { return .zip }
// graphic formats
'.jpg' { return .jpg }
'.png' { return .png }
'.bmp' { return .bmp }
'.gif' { return .gif }
'.tga' { return .tga }
'.ppm' { return .ppm }
'.pgm' { return .pgm }
'.pic' { return .pic }
'.hdr' { return .hdr }
else {}
}
}
// 5 char extension check
if x.len > 5 {
ext5 := x[x.len - 5..].to_lower()
if ext5 == '.jpeg' {
{
return .jpg
}
}
}
return .file
}
[inline]
fn is_image(x Item_type) bool {
if int(x) >= int(Item_type.bmp) {
return true
}
return false
}
[inline]
fn is_container(x Item_type) bool {
if x in [.zip, .folder] {
return true
}
return false
}
[inline]
fn (item_list Item_list) is_inside_a_container() bool {
if item_list.lst.len <= 0 || item_list.n_item <= 0 {
return false
}
return item_list.lst[item_list.item_index].need_extract
}
[inline]
fn (item_list Item_list) get_file_path() string {
if item_list.lst.len <= 0 || item_list.n_item <= 0 {
return ''
}
if item_list.lst[item_list.item_index].path.len > 0 {
return '${item_list.lst[item_list.item_index].path}$item_list.path_sep${item_list.lst[item_list.item_index].name}'
}
return item_list.lst[item_list.item_index].name
}
/******************************************************************************
*
* Scan functions
*
******************************************************************************/
fn (mut item_list Item_list) scan_folder(path string, in_index int) ! {
println('Scanning [$path]')
mut folder_list := []string{}
lst := os.ls(path)!
// manage the single files
for c, x in lst {
pt := '$path$item_list.path_sep$x'
mut item := Item{
path: path
name: x
container_index: in_index
container_item_index: c
}
if os.is_dir(pt) {
folder_list << x
} else {
ext := get_extension(x)
if ext == .zip {
item.i_type = .zip
item_list.lst << item
item_list.scan_zip(pt, item_list.lst.len - 1)!
continue
}
if is_image(ext) == true {
item_list.n_item += 1
item.n_item = item_list.n_item
item.i_type = ext
item.drawable = true
item_list.lst << item
continue
}
}
}
// manage the folders
for x in folder_list {
pt := '$path$item_list.path_sep$x'
item := Item{
path: path
name: x
i_type: .folder
}
item_list.lst << item
item_list.scan_folder(pt, item_list.lst.len - 1)!
}
// println(item_list.lst.len)
// println("==================================")
}
fn (item_list Item_list) print_list() {
println('================================')
for x in item_list.lst {
if x.i_type == .folder {
print('[]')
}
if x.i_type == .zip {
print('[ZIP]')
}
println('$x.path => $x.container_index $x.container_item_index $x.name ne:$x.need_extract')
}
println('n_item: $item_list.n_item index: $item_list.item_index')
println('================================')
}
fn (mut item_list Item_list) get_items_list(args []string) {
item_list.loaded = false
println('Args: $args')
item_list.path_sep = $if windows { '\\' } $else { '/' }
for x in args {
// scan folder
if os.is_dir(x) {
mut item := Item{
path: x
name: x
container_index: item_list.lst.len
i_type: .folder
}
item_list.lst << item
item_list.scan_folder(x, item_list.lst.len - 1) or {
eprintln('ERROR: scanning folder [$x]!')
continue
}
} else {
mut item := Item{
path: ''
name: x
container_index: -1
}
ext := get_extension(x)
// scan .zip
if ext == .zip {
item.i_type = .zip
item_list.lst << item
item_list.scan_zip(x, item_list.lst.len - 1) or {
eprintln('ERROR: scanning zip [$x]!')
continue
}
continue
}
// single images
if is_image(ext) == true {
item_list.n_item += 1
item.n_item = item_list.n_item
item.i_type = ext
item.drawable = true
item_list.lst << item
continue
}
}
}
// debug call for list all the loaded items
// item_list.print_list()
println('Items: $item_list.n_item')
println('Scanning done.')
item_list.get_next_item(1)
item_list.loaded = true
}
/******************************************************************************
*
* Navigation functions
*
******************************************************************************/
fn (mut item_list Item_list) get_next_item(in_inc int) {
// if empty exit
if item_list.lst.len <= 0 || item_list.n_item <= 0 {
return
}
inc := if in_inc > 0 { 1 } else { -1 }
mut i := item_list.item_index + in_inc
i = modulo(i, item_list.lst.len)
start := i
for {
if item_list.lst[i].drawable == true {
item_list.item_index = i
break
}
i = i + inc
i = modulo(i, item_list.lst.len)
// if we are in a loop break it
if i == start {
break
}
}
// println("Found: ${item_list.item_index}")
}
fn (mut item_list Item_list) go_to_next_container(in_inc int) {
// if empty exit
if item_list.lst.len <= 0 || item_list.n_item <= 0 {
return
}
inc := if in_inc > 0 { 1 } else { -1 }
mut i := item_list.item_index + in_inc
i = modulo(i, item_list.lst.len)
start := i
for {
// check if we found a folder
if is_container(item_list.lst[i].i_type) == true
&& i != item_list.lst[item_list.item_index].container_index {
item_list.item_index = i
item_list.get_next_item(1)
break
}
// continue to search
i = i + inc
i = modulo(i, item_list.lst.len)
// if we are in a loop break it
if i == start {
break
}
}
}
/******************************************************************************
*
* Other functions
*
******************************************************************************/
[inline]
fn (mut item_list Item_list) rotate(in_inc int) {
item_list.lst[item_list.item_index].rotation += in_inc
if item_list.lst[item_list.item_index].rotation >= 4 {
item_list.lst[item_list.item_index].rotation = 0
}
}