fixes file search

Reviewed-on: #1

.gitmodules

@@ -0,0 +1,6 @@
+# [submodule "external/Unity"]
+# 	path = external/Unity
+# 	url = https://github.com/ThrowTheSwitch/Unity.git
+[submodule "external/cmocka"]
+	path = external/cmocka
+	url = https://git.cryptomilk.org/projects/cmocka.git

CMakeLists.txt

@@ -23,9 +23,16 @@ add_subdirectory(src/modals)
 add_subdirectory(src/lib)
 add_subdirectory(src/utils)
 add_subdirectory(src/windows)
+add_subdirectory(src/core)
 
 add_subdirectory(src) 
 
+# Testing
+include(CTest)
+include(cmake/OptionsCMocka.cmake)
+add_subdirectory(external/cmocka)
+add_subdirectory(test)
+
 install(
   TARGETS zbbs-client-tui
 )

TODO.md

@@ -1,40 +1,20 @@
 # TODO:
 
 ## Current:
-- [ ] File upload multiline description (window)
-- [ ] Sorting in the file list
-- [ ] Resume download
-- [ ] Separate common structures in the common.h
-- [x] Rewrite cancel download. Use packages and check every time for a confirmation to continue download
-- [x] Show download/upload progress in percentages
-- [x] Break line automatically in modal widgets
-- [x] Cancel upload/download
-- [x] Input: fix non-Latin letters
-- [x] Get rid of unsigned integers
-- [x] Check registration / enter server name again
-- [x] PageUp/PageDown key functionality in lists
-- [x] Permission checkboxes for file upload/edit
-- [x] Upload menu disappears after alert (when opening link to non-existing directory for example).
+
+## Future:
+- [ ] File catalogs (or tags)
+- [ ] Store only unique files (check MD5 sums)
 
 ## Global tasks:
 - [ ] Testing
 - [ ] Documentation
-
-## Bugs:
-- [x] Sometimes segfaults while navigating through modal menu
+- [ ] Resume download
+- [ ] Separate common structures in the common.h
 
 ## Features:
-- [x] Search files
-- [x] Correct spacing in the search bar
-- [x] Finish registration
-- [x] Privilege settings for files
 - [ ] Files removal
 - [ ] Encryption
-- [x] UTF-8 support
 - [ ] Check MD5 sum after download/upload
 - [ ] Hotkeys for buttons
-- [ ] Manipulation by UI-cursor
-
-## Fixes:
-- [x] Check and fix registration and login
-- [x] CMAKE
+- [ ] Manipulation by UI-cursor

cmake/OptionsCMocka.cmake

@@ -0,0 +1,7 @@
+# Disable things we don't need from CMocka
+set(WITH_EXAMPLES OFF CACHE BOOL "Build examples" FORCE)
+set(UNIT_TESTING OFF CACHE BOOL "Build CMocka's own tests" FORCE)
+set(WITH_CMOCKERY_SUPPORT OFF CACHE BOOL "" FORCE)
+
+# Force static library (easier for most projects)
+set(WITH_STATIC_LIB ON CACHE BOOL "Build static library" FORCE)

src/CMakeLists.txt

@@ -20,17 +20,21 @@ elseif(
   endif()
 endif()
 
-file(GLOB M_SOURCES "*.c")
-
 if(DEV_WIDGET) 
-  list(FILTER M_SOURCES EXCLUDE REGEX "main\\.c$")
+    target_sources(zbbs-client-tui
+    PRIVATE
+        main_dev_widget.c
+)
 else()
-  list(FILTER M_SOURCES EXCLUDE REGEX "main_dev_widget\\.c$")
+  target_sources(zbbs-client-tui
+    PRIVATE
+        main.c
+)
 endif()
 
-target_sources(zbbs-client-tui
-    PRIVATE
-        ${M_SOURCES}
+add_library(common INTERFACE)
+target_sources(common
+    PUBLIC FILE_SET HEADERS FILES common.h
 )
 
 target_link_libraries(zbbs-client-tui 
@@ -41,5 +45,6 @@ target_link_libraries(zbbs-client-tui
         bstring
         windows
         utils
+        common
         ${CURSES_LIBRARIES}
 )

src/common.h

@@ -4,8 +4,23 @@
 #ifndef COMMON_H
 #define COMMON_H
 
+#include "dlist.h"
+#include <d_array.h>
+#include <ncursesw/ncurses.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <stdint.h>
 
+#define LOCAL_PORT 1999
+#define SERVER_PORT 2000
+#define LISTEN_QLEN 32
+#define INBUFSIZE 1024
+#define DOWNLOADS_DIR "./Downloads"
+#define DIALOGUE_TITLE 64
+#define DIALOGUE_TEXT 4096
+#define INPUT_TEXT DIALOGUE_TITLE
+#define PACKAGE_SIZE INBUFSIZE * 10
+
 typedef struct {
   int32_t cur_y, cur_x;
   int32_t max_y, max_x;
@@ -13,7 +28,7 @@ typedef struct {
 
 #define MAIN_UI_RESET(app)                                                     \
   app->main_ui.ui = NULL;                                                      \
-  app->main_ui.cb_ui_refresh = NULL;                                              \
+  app->main_ui.cb_ui_refresh = NULL;                                           \
   app->main_ui.cb_b_press = NULL;                                              \
   app->main_ui.b_keys = NULL;                                                  \
   app->main_ui.b_keys_len = 0;
@@ -25,4 +40,268 @@ struct action_key {
   int (*callback)(void *app, void *d_args);
 };
 
+typedef struct fl_item {
+  size_t size;
+  char *name;
+  char *description;
+  char *owner;
+} fl_item_t;
+
+enum main_window_type {
+  mw_fl_server, /* file list on the server */
+  mw_fl_local,  /* local file list */
+  mw_f_desc,    /* file description */
+};
+
+typedef void(draw_f_t)(void *fui);
+
+typedef struct main_window {
+  enum main_window_type type;
+  void *ui; /* structure which describes window UI */
+  int32_t (*cb_b_press)(void *app, void *args); /* callback on button press */
+  void (*cb_ui_refresh)(void *app);             /* refresh callback */
+  void (*reset)(void *app); /* function to reset the state of the window */
+  draw_f_t *draw;
+  struct action_key *b_keys;
+  int32_t b_keys_len;
+} main_window_t;
+
+typedef struct file_args {
+  int file_d;
+  fl_item_t f_selected;
+  fl_item_t *l_start;
+  fl_item_t *l_current;
+  dlist_t *f_list;
+} file_args_t;
+
+typedef struct params {
+  unsigned short port;
+  unsigned addr;
+  char *uname;
+  char *pass;
+  char privileges;
+  int32_t sd;
+  int32_t is_connected : 1;
+} params_t;
+
+enum state {
+  /* TUI-based */
+  S_N_D,
+  S_ASK_SEVER_IP,
+  S_ASK_LOGIN_TYPE,
+  S_ASK_LOGIN_USER,
+  S_ASK_REGISTER,
+  S_WAIT_SERVER,
+  S_PREP_SERVER_MESSAGE,
+  S_PRINT_SERVER_MESSAGE,
+  S_FILE_LIST,
+  S_WAIT_PASS,
+  /* S_FILE_SELECT, */
+  S_DOWNLOAD_FILE,
+  S_UPLOAD_PARAMS,
+  S_UPLOAD_FILE,
+  /* S_UPLOAD_FILE_SELECT, */
+  S_UPLOAD_REQUESTED,
+  S_UPLOAD_SERVER_FINISHES,
+  S_ASK_USER_BEFORE_LOGIN,
+  S_ERR,
+  S_NEXT_ACTION,
+  S_WAIT_REGISTER_CONFIRMATION,
+  S_WAIT_USER_DESCRIPTION,
+  /* Legacy */
+  WAIT_SERVER_INIT,
+  WAIT_SERVER,
+  WAIT_REGISTER,
+  WAIT_REGISTER_CONFIRMATION,
+  WAIT_CLIENT,
+};
+
+enum package_signal { sig_continue, sig_cancel, sig_finish, sig_pause };
+
+typedef struct {
+  enum package_signal signal;
+  size_t package_size;
+} s_file_pd_t; /* file package descriptor */
+
+typedef struct p_file {
+  char *name;
+  char *path;
+  char *description;
+  size_t size;
+  size_t rest;
+  size_t package_rest;
+  int32_t it_count;
+  size_t it_interval;
+  enum package_signal signal;
+  int fd;
+} p_file_t;
+
+typedef struct query_args {
+  int32_t sd;
+  int32_t buf_used;
+  p_file_t *file;
+  enum state state;
+  char buf[INBUFSIZE];
+  bool from_server;
+  params_t *params;
+  struct {
+    char *text;
+    int32_t capacity;
+    int32_t size;
+  } server_message;
+  main_window_t *main_ui;
+  void *progress_bar;
+  void *active_dialogue;
+  void *notification;
+} query_args_t;
+
+enum w_dialogue_color_scheme { dc_normal, dc_alert };
+
+enum w_g_type { g_content, g_action };
+
+enum w_g_dir {
+  horizontal,
+  vertical,
+};
+
+enum w_type {
+  w_end,
+  w_button,
+  w_box,
+  w_group,
+  w_input,
+  w_checkbox,
+  w_progress,
+};
+
+enum w_val_type {
+  val_num,
+  val_ptr,
+  val_nul,
+};
+
+struct w_val_t {
+  enum w_val_type type;
+  union {
+    void *ptr;
+    int32_t num;
+  } val;
+};
+
+typedef struct {
+  int32_t id;
+  int32_t idx; /* element index in the group */
+  void *element;
+  enum w_type type;
+  enum w_g_type g_type;
+  bool is_default;
+  struct w_val_t val;
+} w_g_el_t;
+
+/* widget callback response code */
+enum w_cbrp_code {
+  cbrc_none, /* default */
+  cbrp_val,
+  cbrp_g_el, /* element of type group_el_t */
+  cbrp_err
+};
+
+enum w_pmt_attrs {
+  PMT_POS_CENTER = 01,
+  PMT_ALIGN_CENTER = 03,
+};
+
+/* widget callback response data */
+typedef struct {
+  enum w_cbrp_code code;
+  struct w_val_t val;
+} w_cbrp_data;
+
+typedef struct {
+  void *app;
+  void *element;
+  void *data;
+  w_cbrp_data resp_data;
+  void *active_el;
+} w_cb_args_t;
+
+typedef int32_t (*w_cb_press_t)(void *app, void *data);
+
+typedef void (*w_cb_t)(w_cb_args_t *args);
+
+typedef struct w_t {
+  int32_t id;
+  char title[DIALOGUE_TITLE];
+  struct {
+    int32_t y;
+    int32_t x;
+  } cur; /* cursor position */
+  struct {
+    int32_t y;
+    int32_t x;
+  } sz; /* size */
+  struct {
+    int32_t y;
+    int32_t x;
+  } m; /* margin (relative to the parent) */
+  struct {
+    int32_t y;
+    int32_t x;
+  } ps; /* position (relative to the window) */
+  WINDOW *const *parent_win;
+  struct w_t *w_parent;
+  w_cb_t callback;
+} w_t;
+
+typedef struct group_el_init_t {
+  enum w_type type;
+  bool is_default;
+  bool is_hidden_value;
+  char label[DIALOGUE_TITLE];
+  int32_t length;
+  enum w_g_dir direction;
+  union {
+    int32_t num;
+  } val;
+  struct group_el_init_t *children;
+} w_group_el_init_t;
+
+typedef struct group_t {
+  w_t w;
+  w_g_el_t *elements;
+  enum w_g_dir direction;
+  int32_t count;
+  int32_t first_id, last_id;
+  struct group_t *parent_group;
+} w_group_t;
+
+typedef struct {
+  w_t w;
+  WINDOW *win;
+  w_group_t *g_content;
+  w_group_t *g_action;
+  w_g_el_t *active_el;
+  char text[DIALOGUE_TEXT];
+  bool is_initiated;
+  bool needs_update;
+  bool needs_destroy;
+  coordinates_t *p_coordinates;
+  enum w_dialogue_color_scheme color_scheme;
+  d_array_ptr_t id_map;
+} w_dialogue_t;
+
+typedef struct app_t {
+  WINDOW *win;
+  w_dialogue_t modal;
+  params_t *params;
+  coordinates_t coordinates;
+  query_args_t *query_args;
+  file_args_t *file_args;
+  void (*active_callback)(w_cb_args_t *args);
+  void (*callback_after_notification)(struct app_t *);
+  void *active_widget;
+  wchar_t *top_text;
+  main_window_t main_ui;
+} app_t;
+
 #endif

src/core/CMakeLists.txt

@@ -0,0 +1,23 @@
+add_library(core STATIC)
+
+file(GLOB M_SOURCES "*.c")
+
+target_sources(core 
+    PRIVATE 
+        ${M_SOURCES}
+    PUBLIC
+        FILE_SET HEADERS
+        FILES
+            core.h
+)
+target_link_libraries(core 
+    PRIVATE
+        common
+        widget_core
+        widget
+        bstring
+        utils
+        modals
+        windows
+)
+

src/core/app.c

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "../app.h"
+#include "app.h"
 #include <locale.h>
 #include <ncursesw/ncurses.h>
 #include <netinet/in.h>

src/core/app.h

@@ -4,9 +4,7 @@
 #ifndef APP_H
 #define APP_H
 
-#include "../main.h"
-#include "../common.h"
-#include "dialogue.h"
+#include <common.h>
 #include <ncursesw/ncurses.h>
 #include <widget_core.h>
 #include <bstrlib.h>
@@ -15,20 +13,6 @@ typedef enum {
   modal_color_pair = 3,
 } app_color;
 
-typedef struct app_t {
-  WINDOW *win;
-  w_dialogue_t modal;
-  params_t *params;
-  coordinates_t coordinates;
-  query_args_t *query_args;
-  file_args_t *file_args;
-  void (*active_callback)(w_cb_args_t *args);
-  void (*callback_after_notification)(struct app_t *);
-  void *active_widget;
-  wchar_t *top_text;
-  main_window_t main_ui;
-} app_t;
-
 app_t *app_init(app_t *app);
 void   app_init_nc(void);
 void   app_destroy(app_t *app, int32_t exit_code);

src/core/connection.c

@@ -1,8 +1,8 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "alert.h"
-#include "main.h"
+#include "app.h"
+#include <widget.h>
 #include <arpa/inet.h>
 #include <errno.h>
 #include <ncursesw/ncurses.h>

src/core/connection.h

@@ -3,7 +3,7 @@
 
 #ifndef CONNECTION_H
 #define CONNECTION_H
-#include "main.h"
+
 #include <widget.h>
 
 bool connect_to_server(app_t *params);

src/core/core.h

@@ -0,0 +1,12 @@
+#ifndef CORE_H
+#define CORE_H
+
+#include "app.h"
+#include "connection.h"
+#include "draw_modal.h"
+#include "file_processor.h"
+#include "fs.h"
+#include "query.h"
+#include "server.h"
+
+#endif

src/core/draw_modal.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "main.h"
 #include <modals.h>
 #include <widget.h>
 

src/core/draw_modal.h

@@ -3,6 +3,8 @@
 
 #ifndef DRAW_MODAL_H
 #define DRAW_MODAL_H
+
 #include <widget.h>
+
 void app_draw_modal(app_t *app);
 #endif

src/core/file_processor.c

@@ -2,9 +2,10 @@
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
 #include "alert.h"
-#include "dialogue.h"
+#include "dlist.h"
 #include "server.h"
 #include <arpa/inet.h>
+#include <common.h>
 #include <fcntl.h>
 #include <netinet/in.h>
 #include <stddef.h>
@@ -20,28 +21,27 @@
 #include <termios.h>
 #include <unistd.h>
 #include <widget.h>
-#include <windows.h>
+#include <windows/file_list.h>
 
 #include "file_processor.h"
-#include "main.h"
 #include "query.h"
 
-static void fl_add(fl_item_t **cur, fl_item_t **start, char *fname);
-fl_item_t *fl_select(fl_item_t *start, int num);
-void fl_clear(fl_item_t **start, fl_item_t **current);
+static void fl_add(dlist_t *fl_list, char *q_line);
+static bool fl_rm_cb(void *_ptr);
+
+
+void fl_clear(dlist_t *dlist) { dlist_clear_list(dlist, fl_rm_cb); }
 
 void file_list(file_args_t *f_args, query_args_t *q_args) {
   int32_t qlen;
   char *query = NULL;
-  static char qbuf[INBUFSIZE * 2];
+  static char q_buf[INBUFSIZE * 2];
   static int32_t qbuf_used = 0;
   w_ui_file_list_t *fui = (w_ui_file_list_t *)q_args->main_ui->ui;
   w_dialogue_t *d = (w_dialogue_t *)q_args->active_dialogue;
-  fui->start = &(f_args->l_start);
-  fui->current = &(f_args->l_current);
 
   if (qbuf_used == 0)
-    qbuf[0] = 0;
+    q_buf[0] = 0;
 
   while ((qlen = query_extract_from_buf(q_args->buf, &(q_args->buf_used),
                                         &query))) {
@@ -56,33 +56,35 @@ void file_list(file_args_t *f_args, query_args_t *q_args) {
       q_args->state = WAIT_CLIENT;
       break;
     }
-    strcat(qbuf, query);
-    qbuf_used += strlen(qbuf);
-    if (strchr(qbuf, '\n') == NULL)
+    strcat(q_buf, query);
+    qbuf_used += strlen(q_buf);
+    if (strchr(q_buf, '\n') == NULL)
       continue;
-    fl_add(&(f_args->l_current), &(f_args->l_start), qbuf);
+    fl_add(f_args->f_list, q_buf);
     fui->current_count++;
     free(query);
     query = NULL;
     qbuf_used = 0;
-    qbuf[0] = 0;
+    q_buf[0] = 0;
   }
 }
 
-int32_t ui_file_select(file_args_t *f_args, query_args_t *q_args, int32_t idx) {
-  fl_item_t *l_selected; /* from the list */
+static bool fl_add_cb(void *_dst, void *_src);
+
+int32_t ui_file_select(file_args_t *f_args, query_args_t *q_args,
+                       fl_item_t *l_selected) {
   fl_item_t *f_selected =
       &(f_args->f_selected); /* new copy of file struct (list be cleared) */
   struct stat st = {0};
 
-  l_selected = fl_select(f_args->l_start, idx);
-
   if (l_selected == NULL) {
     return -1;
   }
 
   memcpy(f_selected, l_selected, sizeof(fl_item_t));
 
+  fl_add_cb(f_selected, l_selected);
+
   if (stat(DOWNLOADS_DIR, &st) == -1) {
     mkdir(DOWNLOADS_DIR, 0700);
   }
@@ -91,7 +93,7 @@ int32_t ui_file_select(file_args_t *f_args, query_args_t *q_args, int32_t idx) {
   f_selected->name = NULL;
   sprintf(file_path, "%s/%s", DOWNLOADS_DIR, l_selected->name);
   f_selected->name = strdup(l_selected->name);
-  fl_clear(&f_args->l_start, &f_args->l_current);
+  fl_clear(f_args->f_list);
   f_args->file_d = open(file_path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
   if (f_args->file_d == -1) {
     server_send_string(q_args, "error: %s\n", f_selected->name);
@@ -174,8 +176,8 @@ void file_download(file_args_t *f_args, query_args_t *q_args) {
   if (q_args->file->package_rest <= q_args->buf_used) {
     write_len = q_args->file->package_rest;
     qlen = write(f_args->file_d, q_args->buf, write_len);
-    file_download_receive_after(qlen, q_args, f_args, d, pb)
-    if (q_args->file->signal == sig_continue) {
+    file_download_receive_after(qlen, q_args, f_args, d,
+                                pb) if (q_args->file->signal == sig_continue) {
       server_send_string(q_args, "continue %d\n", PACKAGE_SIZE * 10);
       if (q_args->file->package_rest == 0) {
         q_args->file->package_rest = PACKAGE_SIZE * 10;
@@ -317,80 +319,93 @@ void clear_file_in_query(query_args_t *q_args) {
   q_args->file = NULL;
 }
 
-void init_file_args(file_args_t *f_args) {
+void init_file_args(file_args_t *f_args, app_t *app) {
+  w_ui_file_list_t *fui = app->main_ui.ui;
   f_args->file_d = 0;
   f_args->f_selected.name = NULL;
-  f_args->f_selected.next = NULL;
   f_args->f_selected.size = 0;
   f_args->l_current = NULL;
   f_args->l_start = NULL;
+  if (app->main_ui.type == mw_fl_server) {
+    fui = app->main_ui.ui;
+    if (fui != NULL) {
+      f_args->f_list = fui->f_list;
+    }
+  }
+  f_args->f_list = fui->f_list;
+  app->file_args = f_args;
 }
 
-/* work with file list */
-static void fl_add(fl_item_t **cur, fl_item_t **start, char *line) {
+static void fl_q_extract(fl_item_t *f, char *line) {
   char fowner[32];
   char *descr_begin = NULL;
   int h_len;
   char *name_begin = strchr(line, '[') + 1;
   char *name_end = strchr(line, ']');
   int name_len = name_end - name_begin;
-  fl_item_t *fitem = malloc(sizeof(fl_item_t));
-  sscanf(name_end, "] %zu %s%n", &(fitem->size), fowner, &h_len);
-  /* file name */
-  fitem->name = malloc((sizeof(char)) * (name_len + 1));
-  strncpy(fitem->name, name_begin, name_len);
-  fitem->name[name_len] = 0;
-  /* file owner */
-  fitem->owner = malloc((sizeof(char)) * (strlen(fowner) + 1));
-  strcpy(fitem->owner, fowner);
-  /* file description */
+  sscanf(name_end, "] %zu %s%n", &(f->size), fowner, &h_len);
+  strncpy(f->name, name_begin, name_len);
+  f->name[name_len] = 0;
+  strcpy(f->owner, fowner);
   descr_begin = name_end + h_len + 1;
   if (strcmp(descr_begin, "\n")) {
     int d_len = strlen(line) - h_len;
-    fitem->description = malloc((sizeof(char)) * (d_len));
-    strcpy(fitem->description, descr_begin); // +1 to escape the dividing \32
+    strcpy(f->description, descr_begin); // +1 to escape the dividing \32
     for (int i = 0; i < d_len; i++) {
-      if (fitem->description[i] == '\a') {
-        fitem->description[i] = '\n';
+      if (f->description[i] == '\a') {
+        f->description[i] = '\n';
       }
     }
   } else {
-    fitem->description = NULL;
+    f->description = NULL;
   }
-  /* fitem->description[strlen(line + line_pos)] = 0; */
-  fitem->next = NULL;
-  if (*cur != NULL) {
-    (*cur)->next = fitem;
+}
+
+static bool fl_add_cb(void *_dst, void *_src) {
+  fl_item_t *dst = _dst;
+  fl_item_t *src = _src;
+
+  dst->size = src->size;
+
+  if (src->description != NULL) {
+    dst->description = malloc(sizeof(char) * (strlen(src->description) + 1));
+    strcpy(dst->description, src->description);
   } else {
-    *start = fitem;
+    dst->description = NULL;
   }
-  *cur = fitem;
+
+  dst->name = malloc(sizeof(char) * (strlen(src->name) + 1));
+  strcpy(dst->name, src->name);
+
+  dst->owner = malloc(sizeof(char) * (strlen(src->owner) + 1));
+  strcpy(dst->owner, src->owner);
+  return true;
 }
 
-fl_item_t *fl_select(fl_item_t *start, int num) {
-  fl_item_t *current = start;
-  for (; num != 1; num--) {
-    if (current->next != NULL) {
-      current = current->next;
-    } else {
-      return NULL;
-    }
-  }
-  return current;
+static bool fl_rm_cb(void *_ptr) {
+  fl_item_t *ptr = _ptr;
+  if (ptr->description != NULL)
+    free(ptr->description);
+  if (ptr->name != NULL)
+    free(ptr->name);
+  if (ptr->owner != NULL)
+    free(ptr->owner);
+  free(ptr);
+  return true;
 }
 
-void fl_clear(fl_item_t **start, fl_item_t **arg_current) {
-  if (*start == NULL)
-    return;
-  fl_item_t *next, *current;
-  current = *start;
+/* work with file list */
+static void fl_add(dlist_t *fl_list, char *q_line) {
+  fl_item_t f_item;
+  char f_description[INBUFSIZE * 100];
+  char f_owner[256];
+  char f_name[256];
+  f_item.description = f_description;
+  f_item.owner = f_owner;
+  f_item.name = f_name;
+  f_item.size = 0;
 
-  do {
-    next = current->next;
-    free(current->description);
-    free(current->name);
-    free(current);
-  } while ((current = next) != NULL);
-  *start = NULL;
-  *arg_current = NULL;
+  fl_q_extract(&f_item, q_line);
+
+  dlist_add(fl_list, &f_item, fl_item_t, fl_add_cb, false);
 }

src/core/file_processor.h

@@ -4,16 +4,17 @@
 #ifndef FILE_PROCESSOR_H
 #define FILE_PROCESSOR_H
 
-#include "main.h"
+#include "common.h"
 
 void file_list(file_args_t *f_args, query_args_t *q_args);
 void file_download(file_args_t *f_args, query_args_t *q_args);
-void init_file_args(file_args_t *fargs);
+void init_file_args(file_args_t *fargs, app_t *app);
 int file_upload_request(char *, query_args_t *q_args);
 int file_upload_start(query_args_t *q_args);
 int file_upload(query_args_t *q_args);
 int32_t file_upload_open(char *dpath, char *fname, query_args_t *q_args);
-void fl_clear(fl_item_t **start, fl_item_t **arg_current);
-int32_t ui_file_select(file_args_t *f_args, query_args_t *q_args, int32_t idx);
+void fl_clear(dlist_t *dlist);
+int32_t ui_file_select(file_args_t *f_args, query_args_t *q_args, fl_item_t *ptr);
 void clear_file_in_query(query_args_t *q_args);
+
 #endif

src/core/query.c

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "query.h"
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <ncursesw/ncurses.h>
@@ -23,13 +22,12 @@
 #include <modals.h>
 #include <widget.h>
 #include <widget_core.h>
-#include <windows.h>
 
+#include "app.h"
+#include "query.h"
 #include "alert.h"
 #include "connection.h"
-#include "dialogue.h"
 #include "file_processor.h"
-#include "main.h"
 #include "main_window.h"
 #include "server.h"
 #include "types.h"
@@ -52,13 +50,10 @@ void query_loop(app_t *app) {
   int32_t sd = app->params->sd;
   size_t qlen;
   int sr;
-  static file_args_t file_args;
   w_cb_args_t d_args = {
       .app = app, .element = NULL, .data = NULL, .resp_data.code = cbrc_none};
 
-  init_file_args(&file_args);
   query_args->sd = sd;
-  app->file_args = &file_args;
 
   for (;;) {
     /* update screen */

src/core/query.h

@@ -4,8 +4,6 @@
 #ifndef QUERY_H
 #define QUERY_H
 
-#include "../app.h"
-#include "main.h"
 #include <widget.h>
 
 void query_loop(app_t *);

src/core/server.c

@@ -1,9 +1,8 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "../app.h"
+#include "app.h"
 #include "dialogue.h"
-#include "main.h"
 #include "query.h"
 #include <arpa/inet.h>
 #include <fcntl.h>
@@ -18,7 +17,7 @@
 #include <termios.h>
 #include <unistd.h>
 #include <widget.h>
-#include <windows.h>
+#include <windows/file_list.h>
 
 void ask_uname_and_password(params_t *params);
 void ask_register(params_t *params, char *email);

src/core/server.h

@@ -4,8 +4,8 @@
 #ifndef SERVER_H
 #define SERVER_H
 
-#include "../app.h"
-#include "main.h"
+#include <common.h>
+
 int  process_server_command(char *line, int l_len, app_t *app);
 void ask_register(params_t *params, char *email);
 void server_send_string(query_args_t *q, const char *fmt, ...);

src/main.c

@@ -14,12 +14,11 @@
 #include <widget.h>
 #include <windows.h>
 
-#include "../app.h"
 #include "alert.h"
-#include "connection.h"
-// #include "file_list.h"
-#include "main.h"
-#include "query.h"
+#include "core/file_processor.h"
+#include <core/app.h>
+#include <core/connection.h>
+#include <core/query.h>
 
 int32_t m_id = 0;
 
@@ -29,6 +28,7 @@ int main(int argc, char **argv) {
   app_t app;
   params_t params;
   query_args_t q_args;
+  file_args_t file_args;
 
   app_init_nc();
 
@@ -44,6 +44,7 @@ int main(int argc, char **argv) {
   app.query_args = &q_args;
 
   main_window_set(&app, mw_fl_server);
+  init_file_args(&file_args, &app);
   /* init client to connect to the server */
   app.params->sd = init_client();
 

src/main.h

@@ -9,129 +9,4 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#define LOCAL_PORT 1999
-#define SERVER_PORT 2000
-#define LISTEN_QLEN 32
-#define INBUFSIZE 1024
-#define DOWNLOADS_DIR "./Downloads"
-#define DIALOGUE_TITLE 64
-#define DIALOGUE_TEXT 4096
-#define INPUT_TEXT DIALOGUE_TITLE
-#define PACKAGE_SIZE INBUFSIZE * 10
-
-typedef struct params {
-  unsigned short port;
-  unsigned addr;
-  char *uname;
-  char *pass;
-  char privileges;
-  int32_t sd;
-  int32_t is_connected : 1;
-} params_t;
-
-enum state {
-  /* TUI-based */
-  S_N_D,
-  S_ASK_SEVER_IP,
-  S_ASK_LOGIN_TYPE,
-  S_ASK_LOGIN_USER,
-  S_ASK_REGISTER,
-  S_WAIT_SERVER,
-  S_PREP_SERVER_MESSAGE,
-  S_PRINT_SERVER_MESSAGE,
-  S_FILE_LIST,
-  S_WAIT_PASS,
-  /* S_FILE_SELECT, */
-  S_DOWNLOAD_FILE,
-  S_UPLOAD_PARAMS,
-  S_UPLOAD_FILE,
-  /* S_UPLOAD_FILE_SELECT, */
-  S_UPLOAD_REQUESTED,
-  S_UPLOAD_SERVER_FINISHES,
-  S_ASK_USER_BEFORE_LOGIN,
-  S_ERR,
-  S_NEXT_ACTION,
-  S_WAIT_REGISTER_CONFIRMATION,
-  S_WAIT_USER_DESCRIPTION,
-  /* Legacy */
-  WAIT_SERVER_INIT,
-  WAIT_SERVER,
-  WAIT_REGISTER,
-  WAIT_REGISTER_CONFIRMATION,
-  WAIT_CLIENT,
-};
-
-enum package_signal { sig_continue, sig_cancel, sig_finish, sig_pause };
-
-typedef struct {
-  enum package_signal signal;
-  size_t package_size;
-} s_file_pd_t; /* file package descriptor */
-
-typedef struct p_file {
-  char *name;
-  char *path;
-  char *description;
-  size_t size;
-  size_t rest;
-  size_t package_rest;
-  int32_t it_count;
-  size_t it_interval;
-  enum package_signal signal;
-  int fd;
-} p_file_t;
-
-typedef struct fl_item {
-  size_t size;
-  char *name;
-  char *description;
-  char *owner;
-  struct fl_item *next;
-} fl_item_t;
-
-typedef struct file_args {
-  int file_d;
-  fl_item_t f_selected;
-  fl_item_t *l_start;
-  fl_item_t *l_current;
-} file_args_t;
-
-enum main_window_type {
-  mw_fl_server, /* file list on the server */
-  mw_fl_local,  /* local file list */
-  mw_f_desc,    /* file description */
-};
-
-typedef void(draw_f_t)(void *fui);
-
-typedef struct main_window {
-  enum main_window_type type;
-  void *ui; /* structure which describes window UI */
-  int32_t (*cb_b_press)(void *app, void *args); /* callback on button press */
-  void (*cb_ui_refresh)(void *app);             /* refresh callback */
-  void (*reset)(void *app); /* function to reset the state of the window */
-  draw_f_t *draw;
-  struct action_key *b_keys;
-  int32_t b_keys_len;
-} main_window_t;
-
-typedef struct query_args {
-  int32_t sd;
-  int32_t buf_used;
-  p_file_t *file;
-  enum state state;
-  char buf[INBUFSIZE];
-  bool from_server;
-  params_t *params;
-  struct {
-    char *text;
-    int32_t capacity;
-    int32_t size;
-  } server_message;
-  main_window_t *main_ui;
-  void *progress_bar;
-  void *active_dialogue;
-  void *notification;
-} query_args_t;
-
 #endif

src/modals/CMakeLists.txt

@@ -2,13 +2,13 @@ add_library(modals STATIC)
 
 file(GLOB M_SOURCES "*.c")
 
-target_link_directories(modals 
-    PRIVATE 
-        "../widget/" 
-        "../widget_core/" 
-        "../lib/" 
-        "../utils/"
-)
+# target_link_directories(modals 
+#     PRIVATE 
+#         "../widget/" 
+#         "../widget_core/" 
+#         "../lib/" 
+#         "../utils/"
+# )
 
 target_link_libraries(modals 
     PRIVATE 
@@ -16,6 +16,8 @@ target_link_libraries(modals
         widget_core 
         bstring
         utils
+        common
+        windows
 )
 
 target_sources(modals

src/modals/ask_server_addr.c

@@ -4,7 +4,8 @@
 #include <ncursesw/ncurses.h>
 #include <widget.h>
 #include <widget_core.h>
-#include "../connection.h"
+#include <core/connection.h>
+#include <core/app.h>
 #include "group.h"
 
 typedef struct {

src/modals/load_pr.c

@@ -1,15 +1,15 @@
-#include "../server.h"
-#include "../windows/file_list.h"
-#include "alert.h"
-#include "dialogue.h"
-#include "group.h"
-#include "utils.h"
+#include <core/server.h>
+#include <windows/file_list.h>
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <widget.h>
 
+#include "alert.h"
+#include "dialogue.h"
+#include "group.h"
+
 void dwn_pr_modal_cb(w_cb_args_t *args) {
   /* only cancel action */
   int32_t key = *((int32_t *)args->data);

src/modals/login_credentials.c

@@ -6,7 +6,8 @@
 #include <unistd.h>
 
 #include <widget.h>
-#include "../server.h"
+#include <core/server.h>
+#include <core/app.h>
 
 typedef struct {
   w_button_t *element;

src/modals/login_option.c

@@ -6,7 +6,8 @@
 
 #include <unistd.h>
 #include <widget.h>
-#include "../server.h"
+#include <core/app.h>
+#include <core/server.h>
 
 typedef struct {
   w_button_t *element;

src/modals/register.c

@@ -8,7 +8,7 @@
 
 #include "alert.h"
 #include "group.h"
-#include "../server.h"
+#include <core/server.h>
 
 typedef struct {
   w_button_t *element;

src/modals/upload_props_dialogue.c

@@ -1,15 +1,14 @@
-#include "checkbox.h"
-#include "group.h"
-#include "widget_core.h"
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
-#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <stdlib.h>
+
 #include <utils.h>
 #include <widget.h>
-
-#include "../server.h"
+#include <core/server.h>
+#include "checkbox.h"
+#include "group.h"
 
 void upload_props_dialogue_modal_cb(w_cb_args_t *args) {
   w_cb_args_t d_args;
@@ -40,10 +39,6 @@ void upload_props_dialogue_modal_cb(w_cb_args_t *args) {
                          app->query_args->file->size, privileges);
       /* app->query_args->file->description =
           malloc(desc_input->value_len + 9); reserve space for \n:END:\n */
-      app->query_args->file->description =
-          malloc(sizeof("[Empty description]\n:END:\n"));
-      strcpy(app->query_args->file->description,
-             "[Empty description]\n:END:\n");
       d->needs_destroy = true;
       app->query_args->state = S_UPLOAD_REQUESTED;
       break;

src/utils/dlist.c

@@ -4,60 +4,199 @@
 #include <stdlib.h>
 #include <string.h>
 
-typedef struct dlist_el_t {
-  struct dlist_el_t *next;
-  struct dlist_el_t *previous;
-  void *el_ptr;
-} dlist_el_t;
+#include "dlist.h"
 
-typedef struct dlist_t {
-  dlist_el_t *start;
-  dlist_el_t *current;
-  size_t len;
-} dlist_t;
+/*
+  Uses *add* when needs to make a full copy of the element.
+  Uses *insert* when operates with nodes.
+*/
 
-void dlist_add(dlist_t *dlist, void *el_ptr, int el_siz, bool prepend);
-
-dlist_t *dlist_init(void *el_ptr, int el_siz) {
+dlist_t *_dlist_init(void *el_ptr, int el_siz, dblist_add_cb_t add_cb) {
   dlist_t *dlist = malloc(sizeof(dlist_t));
   dlist->len = 0;
   dlist->current = NULL;
   dlist->start = NULL;
 
   if (el_ptr != NULL) {
-    dlist_add(dlist, el_ptr, el_siz, false);
+    _dlist_add(dlist, el_ptr, el_siz, add_cb, false);
   }
 
   return dlist;
 }
 
-void dlist_add(dlist_t *dlist, void *el_ptr, int el_siz, bool prepend) {
-  dlist_el_t *d_el = malloc(sizeof(dlist_el_t));
-  d_el->el_ptr = malloc(el_siz);
-  memcpy(d_el->el_ptr, el_ptr, el_siz);
-
-  if (dlist->start == NULL) {
-    d_el->previous = NULL;
-    d_el->next = NULL;
-    dlist->start = d_el;
-    dlist->current = d_el;
-  } else if (prepend) {
-    d_el->previous = NULL;
-    d_el->next = dlist->start;
-    dlist->start = d_el;
+void _dlist_insert(dlist_t *dlist, dlist_node_t *new_el,
+                   dlist_node_t *prev_node) {
+  if (prev_node != NULL) {
+    new_el->next = prev_node->next;
+    prev_node->next->previous = new_el;
+    new_el->previous = prev_node;
+    prev_node->next = new_el;
+    if (new_el->next == NULL) {
+      dlist->current = new_el;
+      dlist->work_pointer = new_el;
+    }
   } else {
-    d_el->next = NULL;
-    dlist->current->next = d_el;
-    dlist->current = d_el;
+    new_el->next = dlist->start;
+    new_el->previous = NULL;
+    dlist->start->previous = new_el;
+    dlist->start = new_el;
   }
   dlist->len++;
 }
 
-void *dlist_get_current(dlist_t *dlist) {
-    return dlist->current->el_ptr;
+void _dlist_insert_end(dlist_t *dlist, dlist_node_t *new_node) {
+  dlist->current->next = new_node;
+  new_node->previous = dlist->current;
+  new_node->next = NULL;
+  dlist->current = new_node;
+  dlist->work_pointer = new_node;
+  dlist->len++;
 }
 
+void _dlist_add_sort(dlist_t *dlist, void *el_ptr, int el_siz,
+                     dblist_sort_cb_t cb, dblist_add_cb_t add_cb) {
+  dlist_node_t *node = malloc(sizeof(dlist_node_t));
+  node->el_ptr = malloc(el_siz);
+  add_cb(node->el_ptr, el_ptr);
+
+  dlist_node_t *dlist_item = dlist->start;
+  bool res = true;
+  if (dlist->start == NULL) {
+    dlist->start = node;
+    dlist->current = node;
+    node->next = NULL;
+    node->previous = NULL;
+    dlist->work_pointer = node;
+    dlist->len++;
+    return;
+  }
+
+  for (int i = 0; i < dlist->len; i++) {
+    res = cb(el_ptr, dlist_item->el_ptr);
+    if (!res)
+      break;
+    dlist_item = dlist_item->next;
+  }
+
+  if (!res) {
+    dlist_item = dlist_item->previous;
+    _dlist_insert(dlist, node, dlist_item);
+  } else {
+    _dlist_insert_end(dlist, node);
+  }
+}
+
+void _dlist_add(dlist_t *dlist, void *el_ptr, int el_siz,
+                dblist_add_cb_t *add_cb, bool prepend) {
+  dlist_node_t *node = malloc(sizeof(dlist_node_t));
+  node->el_ptr = malloc(el_siz);
+  add_cb(node->el_ptr, el_ptr);
+
+  if (dlist->start == NULL) {
+    node->previous = NULL;
+    node->next = NULL;
+    dlist->start = node;
+    dlist->current = node;
+    dlist->work_pointer = node;
+  } else if (prepend) {
+    node->previous = NULL;
+    node->next = dlist->start;
+    dlist->start->previous = node;
+    dlist->start = node;
+  } else {
+    node->previous = dlist->current;
+    node->next = NULL;
+    dlist->current->next = node;
+    dlist->current = node;
+    dlist->work_pointer = node;
+  }
+  dlist->len++;
+}
+
+dlist_node_t *find_node_by_ptr(dlist_t *dlist, void *el_ptr) {
+  dlist_node_t *node = dlist->start;
+  do {
+    if (node->el_ptr == el_ptr)
+      break;
+  } while ((node = node->next) != NULL);
+  if (node->el_ptr == el_ptr)
+    return node;
+  return NULL;
+}
+
+int dlist_remove_by_ptr(dlist_t *dlist, void *el_ptr, dblist_rm_cb_t cb) {
+  dlist_node_t *node = find_node_by_ptr(dlist, el_ptr);
+  if (node == NULL)
+    return -1;
+  node->next->previous = node->previous;
+  node->previous->next = node->next;
+  dlist->len--;
+  if (node->next == NULL)
+    dlist->current = node->previous;
+  if (node->previous == NULL)
+    dlist->start = node->next;
+  cb(node->el_ptr);
+  free(node);
+  return 1;
+}
+
+int dlist_clear_list(dlist_t *dlist, dblist_rm_cb_t cb) {
+  dlist_node_t *current = dlist->start;
+  dlist_node_t *next = NULL;
+
+  if (current == NULL) return 1;
+
+  do {
+    cb(current->el_ptr);
+    next = current->next;
+    free(current);
+    current = next;
+  } while (current != NULL);
+
+  dlist->len = 0;
+  dlist->current = NULL;
+  dlist->start = NULL;
+  dlist->work_pointer = NULL;
+
+  return 1;
+}
+
+/* Iterators */
+
 void *dlist_it_prev(dlist_t *dlist) {
-    dlist->current = dlist->current->previous;
-    return dlist->current;
+  dlist_node_t *cur_ptr = dlist->work_pointer;
+  if (cur_ptr != NULL) {
+    dlist->work_pointer = dlist->work_pointer->previous;
+    return cur_ptr->el_ptr;
+  } 
+  return NULL;
+}
+
+void *dlist_it_next(dlist_t *dlist) {
+  dlist_node_t *cur_ptr = dlist->work_pointer;
+  if (cur_ptr != NULL) {
+    dlist->work_pointer = dlist->work_pointer->next;
+    return cur_ptr->el_ptr;
+  } 
+  return NULL;
+}
+
+dlist_node_t *dlist_wind_fwd(dlist_t *dlist, dlist_node_t *start, int count) {
+  dlist_node_t *new_ptr = start;
+
+  for (int i = 0; i <= count && new_ptr != NULL; i++) {
+    new_ptr = new_ptr->next;
+  }
+  dlist->work_pointer = new_ptr;
+  return new_ptr;
+}
+
+dlist_node_t *dlist_wind_bwd(dlist_t *dlist, dlist_node_t *start, int count) {
+  dlist_node_t *new_ptr = start;
+
+  for (int i = 0; i <= count && new_ptr != NULL; i++) {
+    new_ptr = new_ptr->previous;
+  }
+  dlist->work_pointer = new_ptr;
+  return new_ptr;
 }

src/utils/dlist.h

@@ -0,0 +1,51 @@
+#ifndef DLIST_H
+#define DLIST_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef struct dlist_node_t {
+  struct dlist_node_t *next;
+  struct dlist_node_t *previous;
+  void *el_ptr;
+} dlist_node_t;
+
+typedef struct dlist_t {
+  dlist_node_t *start;
+  dlist_node_t *current;
+  dlist_node_t *work_pointer;
+  size_t len;
+} dlist_t;
+
+/* Returns if a > b */
+typedef bool dblist_sort_cb_t(void *a, void *b);
+typedef bool dblist_add_cb_t(void *dst, void *src);
+typedef bool dblist_rm_cb_t(void *el_ptr);
+
+dlist_t *_dlist_init(void *el_ptr, int el_siz, dblist_add_cb_t);
+void *dlist_get_current(dlist_t *dlist);
+void *dlist_it_prev(dlist_t *dlist);
+void _dlist_add(dlist_t *dlist, void *el_ptr, int el_siz,
+                dblist_add_cb_t add_cb, bool prepend);
+void *dlist_it_prev(dlist_t *dlist);
+void *dlist_it_next(dlist_t *dlist);
+void _dlist_add_sort(dlist_t *dlist, void *el_ptr, int el_siz,
+                     dblist_sort_cb_t cb, dblist_add_cb_t add_cb);
+int dlist_remove_by_ptr(dlist_t *dlist, void *el_ptr, dblist_rm_cb_t cb);
+int dlist_clear_list(dlist_t *dlist, dblist_rm_cb_t cb);
+dlist_node_t *dlist_wind_fwd(dlist_t *dlist, dlist_node_t *start, int count);
+dlist_node_t *dlist_wind_bwd(dlist_t *dlist, dlist_node_t *start, int count);
+
+#define dlist_init(el_ptr, el_def, add_cb)                                     \
+  _dlist_init(el_ptr, sizeof(el_def), add_cb)
+#define dlist_add(dlist, el_ptr, el_def, add_cb, prepend)                      \
+  _dlist_add(dlist, el_ptr, sizeof(el_def), add_cb, prepend)
+#define dlist_get_current(dlist) dlist->current->el_ptr
+#define dlist_get_working_point(dlist) dlist->current->el_ptr
+#define dlist_add_sort(dlist, el_ptr, el_typ, sort_cb, add_cb)                 \
+  _dlist_add_sort(dlist, el_ptr, sizeof(el_typ), sort_cb, add_cb)
+#define dlist_get_ptr(node_ptr) node_ptr == NULL ? NULL : node_ptr->el_ptr
+#define dlist_set_wp(dlist, node_ptr) dlist->work_pointer = node_ptr
+#define dlist_get_wp(dlist) dlist->work_pointer
+
+#endif

src/widget/CMakeLists.txt

@@ -7,6 +7,8 @@ target_link_libraries(widget
         bstring
         widget_core
         utils
+        common
+        core
 )
 
 target_sources(widget

src/widget/alert.c

@@ -1,6 +1,6 @@
 #include "alert.h"
 #include "dialogue.h"
-#include "widget_core.h"
+#include <core/app.h>
 #include <ncursesw/ncurses.h>
 #include <stdarg.h>
 #include <stdint.h>

src/widget/alert.h

@@ -1,8 +1,9 @@
 #ifndef W_ALERT_H
 #define W_ALERT_H
 
-#include "../app.h"
+#include <common.h>
 #include <stdarg.h>
+#include <stdbool.h>
 
 void w_alert_init(app_t *app);
 void w_alert(const char *message);

src/widget/button.c

@@ -8,7 +8,8 @@
 
 #include <widget_core.h>
 #include "button.h"
-#include "../app.h"
+
+#include <core/app.h>
 
 w_button_t *init_button(WINDOW **win, w_t *w_parent, char *label) {
   w_button_t *btn = malloc(sizeof(w_button_t));

src/widget/checkbox.c

@@ -6,7 +6,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "../app.h"
+#include <core/app.h>
 #include "checkbox.h"
 #include <widget_core.h>
 

src/widget/dialogue.c

@@ -11,6 +11,7 @@
 #include <wchar.h>
 #include <widget.h>
 #include <widget_core.h>
+#include <core/app.h>
 
 static void (*active_callback_backup)(w_cb_args_t *) = NULL;
 

src/widget/dialogue.h

@@ -4,31 +4,14 @@
 #ifndef W_DIALOGUE_H
 #define W_DIALOGUE_H
 
-#include "../common.h"
-#include "group.h"
+#include <common.h>
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
 #include <utils.h>
 #include <widget_core.h>
+
 #define MAX_IDS 64
 
-enum w_dialogue_color_scheme { dc_normal, dc_alert };
-
-typedef struct {
-  w_t w;
-  WINDOW *win;
-  w_group_t *g_content;
-  w_group_t *g_action;
-  w_g_el_t *active_el;
-  char text[DIALOGUE_TEXT];
-  bool is_initiated;
-  bool needs_update;
-  bool needs_destroy;
-  coordinates_t *p_coordinates;
-  enum w_dialogue_color_scheme color_scheme;
-  d_array_ptr_t id_map;
-} w_dialogue_t;
-
 void    w_dialogue_init(w_dialogue_t *d, const char title[], const char text[],
                    coordinates_t *p_coordinates);
 void    w_dialogue_vinit(w_dialogue_t *dialogue, const char title[],

src/widget/group.h

@@ -7,28 +7,7 @@
 #include <stdint.h>
 #include <utils.h>
 #include <widget_core.h>
-
-typedef struct group_el_init_t {
-  enum w_type type;
-  bool is_default;
-  bool is_hidden_value;
-  char label[DIALOGUE_TITLE];
-  int32_t length;
-  enum w_g_dir direction;
-  union {
-    int32_t num;
-  } val;
-  struct group_el_init_t *children;
-} w_group_el_init_t;
-
-typedef struct group_t {
-  w_t w;
-  w_g_el_t *elements;
-  enum w_g_dir direction;
-  int32_t count;
-  int32_t first_id, last_id;
-  struct group_t *parent_group;
-} w_group_t;
+#include <common.h>
 
 w_group_t *w_group_init(WINDOW **win, w_t *w_parent, w_group_el_init_t *children,
                     d_array_ptr_t *id_map, enum w_g_dir dir,

src/widget/input.c

@@ -6,7 +6,8 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "../app.h"
+#include <core/app.h>
+#include <utils.h>
 #include "input.h"
 #include <wchar.h>
 #include <widget_core.h>

src/widget/input.h

@@ -4,7 +4,6 @@
 #ifndef W_INPUT_H
 #define W_INPUT_H
 
-#include "../main.h"
 #include <stdint.h>
 #include <widget_core.h>
 

src/widget/progress_bar.c

@@ -2,7 +2,7 @@
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
 #include "progress_bar.h"
-#include "../app.h"
+#include <core/app.h>
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
 #include <stdlib.h>

src/widget_core/CMakeLists.txt

@@ -5,6 +5,7 @@ file(GLOB M_SOURCES "*.c")
 target_link_libraries(widget_core 
     PRIVATE
         utils
+        common
 )
 
 target_sources(widget_core

src/widget_core/widget_core.c

@@ -6,7 +6,6 @@
   so it is separated from the widget directory */
 
 #include "widget_core.h"
-#include "../main.h"
 #include <ncursesw/ncurses.h>
 #include <stddef.h>
 #include <stdint.h>

src/widget_core/widget_core.h

@@ -4,104 +4,9 @@
 #ifndef WIDGET_CORE_H
 #define WIDGET_CORE_H
 
-#include "../main.h"
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
-
-enum w_g_type { g_content, g_action };
-
-enum w_g_dir {
-  horizontal,
-  vertical,
-};
-
-enum w_type {
-  w_end,
-  w_button,
-  w_box,
-  w_group,
-  w_input,
-  w_checkbox,
-  w_progress,
-};
-
-enum w_val_type {
-  val_num,
-  val_ptr,
-  val_nul,
-};
-
-struct w_val_t {
-  enum w_val_type type;
-  union {
-    void *ptr;
-    int32_t num;
-  } val;
-};
-
-typedef struct {
-  int32_t id;
-  int32_t idx; /* element index in the group */
-  void *element;
-  enum w_type type;
-  enum w_g_type g_type;
-  bool is_default;
-  struct w_val_t val;
-} w_g_el_t;
-
-/* widget callback response code */
-enum w_cbrp_code {
-  cbrc_none, /* default */
-  cbrp_val,
-  cbrp_g_el, /* element of type group_el_t */
-  cbrp_err
-};
-
-/* widget callback response data */
-typedef struct {
-  enum w_cbrp_code code;
-  struct w_val_t val;
-} w_cbrp_data;
-
-typedef struct {
-  void *app;
-  void *element;
-  void *data;
-  w_cbrp_data resp_data;
-  void *active_el;
-} w_cb_args_t;
-
-typedef void (*w_cb_t)(w_cb_args_t *args);
-typedef int32_t (*w_cb_press_t)(void *app, void *data);
-
-typedef struct w_t {
-  int32_t id;
-  char title[DIALOGUE_TITLE];
-  struct {
-    int32_t y;
-    int32_t x;
-  } cur; /* cursor position */
-  struct {
-    int32_t y;
-    int32_t x;
-  } sz; /* size */
-  struct {
-    int32_t y;
-    int32_t x;
-  } m; /* margin (relative to the parent) */
-  struct {
-    int32_t y;
-    int32_t x;
-  } ps; /* position (relative to the window) */
-  WINDOW *const *parent_win;
-  struct w_t *w_parent;
-  w_cb_t callback;
-} w_t;
-
-enum w_pmt_attrs {
-  PMT_POS_CENTER = 01,
-  PMT_ALIGN_CENTER = 03,
-};
+#include <common.h>
 
 void w_init(w_t *w, w_t *w_parent, WINDOW **win, char *title);
 int32_t w_get_max_line_len(const char *text, int32_t *line_count);

src/windows/CMakeLists.txt

@@ -2,13 +2,13 @@ add_library(windows STATIC)
 
 file(GLOB M_SOURCES "*.c")
 
-target_link_directories(windows 
-    PRIVATE 
-        "../widget/" 
-        "../widget_core/" 
-        "../lib/" 
-        "../utils/"
-)
+# target_link_directories(windows 
+#     PRIVATE 
+#         "../widget/" 
+#         "../widget_core/" 
+#         "../lib/" 
+#         "../utils/"
+# )
 
 target_link_libraries(windows 
     PRIVATE
@@ -16,6 +16,8 @@ target_link_libraries(windows
         widget_core
         bstring
         utils
+        core
+        common
 )
 
 target_sources(windows

src/windows/file_list.c

@@ -2,11 +2,10 @@
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
 #include "file_list.h"
-#include "../app.h"
-#include "../file_processor.h"
-#include "../fs.h"
-#include "../server.h"
 #include "main_window.h"
+#include "dlist.h"
+#include <common.h>
+#include <core.h>
 #include <bstrlib.h>
 #include <ncursesw/ncurses.h>
 #include <stdbool.h>
@@ -46,7 +45,7 @@ static void w_fl_cb(w_cb_args_t *args) {
       }
       server_send_string(app->query_args, "%s %d %d\n", q_prefix,
                          fui->max_lines, 1);
-      w_fl_reset(fui);
+      fl_clear(fui->f_list);
     } else {
       bconchar(fui->search_key, key);
       w_fl_draw(fui);
@@ -58,6 +57,8 @@ static void w_fl_cb(w_cb_args_t *args) {
   case KEY_DOWN:
     if (fui->current_idx < fui->current_count - 1) {
       fui->current_idx++;
+      if (fui->f_selected == NULL) fui->f_selected = fui->f_list->start;
+      fui->f_selected = fui->f_selected->next;
     } else if (fui->current_page < fui->pages) {
       app->query_args->state = S_FILE_LIST;
       server_send_string(app->query_args, "%s %d %d\n", q_prefix,
@@ -70,6 +71,7 @@ static void w_fl_cb(w_cb_args_t *args) {
   case KEY_UP:
     if (fui->current_idx > 0) {
       fui->current_idx--;
+      fui->f_selected = fui->f_selected->previous;
     } else if (fui->current_page > 1) {
       app->query_args->state = S_FILE_LIST;
       server_send_string(app->query_args, "%s %d %d\n", q_prefix,
@@ -111,7 +113,7 @@ static void w_fl_cb(w_cb_args_t *args) {
                        1);
     w_fl_reset(fui);
   case '\n':
-    ui_file_select(app->file_args, app->query_args, fui->current_idx + 1);
+    ui_file_select(app->file_args, app->query_args, dlist_get_ptr(fui->f_selected));
     break;
   }
 }
@@ -188,11 +190,15 @@ void *w_fl_init(app_t *app) {
   fui->activate_last = false;
   fui->active_search = false;
   fui->search_key = bfromcstrrangealloc(12, 64, "");
-  fui->start = NULL;
-  fui->current = NULL;
   fui->w.sz.x = getmaxx(app->win);
   fui->w.sz.y = getmaxy(app->win);
 
+  fui->f_list = dlist_init(NULL, fl_item_t, NULL);
+  fui->f_selected = NULL;
+  if (app->file_args != NULL) {
+    app->file_args->f_list = fui->f_list;
+  }
+
   /* * INIT UI * */
 
   /* define the width for each sub window */
@@ -210,13 +216,13 @@ void *w_fl_init(app_t *app) {
 }
 
 void w_fl_destroy(w_ui_file_list_t **fui) {
-  fl_clear((*fui)->start, (*fui)->current);
+  fl_clear((*fui)->f_list);
   free(*fui);
   *fui = NULL;
 }
 
 void w_fl_reset(w_ui_file_list_t *fl_ui) {
-  fl_clear(fl_ui->start, fl_ui->current);
+  fl_clear(fl_ui->f_list);
   fl_ui->current_idx = 0;
   fl_ui->current_page = 0;
   fl_ui->pages = 0;
@@ -242,17 +248,14 @@ void w_fl_draw(w_ui_file_list_t *fui) {
   sz_x -= 1;                 /* do not count the borders */
   p_y = 1;
   p_x = 1;
-  fl_item_t *el = NULL;
-  fl_item_t *active_el = NULL;
+
+  dlist_node_t *wp_bac = dlist_get_wp(fui->f_list);
+  dlist_set_wp(fui->f_list, fui->f_list->start);
+  fl_item_t *el = dlist_it_next(fui->f_list);
+  fl_item_t *active_el = dlist_get_ptr(fui->f_selected);
   int32_t cur_el_idx = 0;
-
   box(fui->win_list, 0, 0);
 
-  if (fui->start != NULL) {
-    el = *(fui->start);
-    active_el = el;
-  }
-
   if (fui->activate_last) {
     fui->current_idx = fui->max_lines - 1;
     fui->activate_last = false;
@@ -281,13 +284,15 @@ void w_fl_draw(w_ui_file_list_t *fui) {
     }
     p_y++;
     cur_el_idx++;
-  } while ((el = el->next) != NULL && p_y < sz_y_f);
+  } while ((el = dlist_it_next(fui->f_list)) != NULL && p_y < sz_y_f);
+
+  dlist_set_wp(fui->f_list, wp_bac);
 
   p_x = 1;
   int32_t p_len;
 
   if (!fui->active_search && fui->search_key->slen > 0 &&
-      *(fui->start) == NULL) {
+      fui->f_list->start == NULL) {
     bstring text = bfromStatic("[No data to show]");
     for (; p_y < (sz_y_f / 2); p_y++) {
       mvwprintw(win, p_y, p_x, "%*s", sz_x - 1, "");

src/windows/file_list.h

@@ -4,15 +4,15 @@
 #ifndef W_FILE_LIST_H
 #define W_FILE_LIST_H
 
-#include "../app.h"
+#include "dlist.h"
 #include <bstrlib.h>
 #include <stdint.h>
 #include <widget_core.h>
 
 typedef struct {
   w_t w;
-  fl_item_t **current;
-  fl_item_t **start;
+  dlist_t *f_list;
+  dlist_node_t *f_selected;
   int32_t current_idx;
   int32_t current_count;
   int32_t full_count;

src/windows/fs_file_list.c

@@ -15,14 +15,24 @@
 #include <unistd.h>
 #include <utils.h>
 
-#include "../file_processor.h"
-#include "../fs.h"
-#include "../server.h"
+#include <core/app.h>
+#include <core/file_processor.h>
+#include <core/fs.h>
+#include <core/server.h>
+#include <wchar.h>
+
 #include "alert.h"
+#include "dlist.h"
 #include "fs_file_list.h"
 #include "main_window.h"
 #include "widget_core.h"
 
+#define fl_add(dlist, el_ptr, prepend)                                         \
+  dlist_add(dlist, el_ptr, w_lfl_item_t, fl_add_cb, prepend)
+#define fl_add_sort(dlist, el_ptr)                                             \
+  dlist_add_sort(dlist, el_ptr, w_lfl_item_t, fl_add_sort_cb, fl_add_cb)
+#define fl_clear(f_list) dlist_clear_list(f_list, fl_clear_cb)
+
 // void w_fl_reset(w_lfl_ui_t *fl_ui);
 
 static size_t get_file_size(char *path) {
@@ -44,124 +54,163 @@ struct fl_args {
   u_char d_type;
 };
 
-static void fl_add(w_lfl_item_t **f_start, w_lfl_item_t **f_current,
-                   struct fl_args *fargs) {
-  w_lfl_item_t *c_item = malloc(sizeof(w_lfl_item_t));
-  c_item->name = malloc(strlen(fargs->name) + 1);
-  strcpy(c_item->name, fargs->name);
-  c_item->size = fargs->size;
-  c_item->next = NULL;
-  c_item->d_type = fargs->d_type;
-  if (fargs->path != NULL) {
-    c_item->path = malloc(strlen(fargs->path) + 1);
-    strcpy(c_item->path, fargs->path);
+static bool fl_add_cb(void *_dst, void *_src) {
+  w_lfl_item_t *dst = _dst;
+  w_lfl_item_t *src = _src;
+  memcpy(dst, src, sizeof(w_lfl_item_t));
+  if (src->name != NULL) {
+    dst->name = malloc(strlen(src->name) + 1);
+    strcpy(dst->name, src->name);
   }
-  if (*f_start == NULL) {
-    c_item->prev = NULL;
-    *f_start = c_item;
-    *f_current = c_item;
+
+  if (src->w_name != NULL) {
+    dst->w_name = malloc((wcslen(src->w_name) + 1) * sizeof(wchar_t));
+    wcscpy(dst->w_name, src->w_name);
+  }
+
+  if (src->path != NULL) {
+    dst->path = malloc(strlen(src->path) + 1);
+    strcpy(dst->path, src->path);
   } else {
-    c_item->prev = *f_current;
-    (*f_current)->next = c_item;
-    *f_current = c_item;
+    dst->path = NULL;
   }
+  return 1;
 }
 
-static void lfl_clear(w_lfl_item_t **start, w_lfl_item_t **arg_current) {
-  if (*start == NULL)
-    return;
-  w_lfl_item_t *next, *current;
-  current = *start;
+static int _strcmp(wchar_t *a, wchar_t *b) {
+  wchar_t abuf[256];
+  wchar_t bbuf[256];
 
-  do {
-    next = current->next;
-    free(current->name);
-    free(current);
-  } while ((current = next) != NULL);
-  *start = NULL;
-  *arg_current = NULL;
+  int c = 0;
+
+  for (int i = 0; a[i] != '\0'; i++) {
+    abuf[i] = a[i] & ~32; /* case non-sensitive for Latin characters */
+  }
+
+  for (int i = 0; b[i] != '\0'; i++) {
+    bbuf[i] = b[i] & ~32;
+  }
+  return wcscmp(abuf, bbuf);
+}
+
+static bool fl_add_sort_cb(void *_a, void *_b) {
+  w_lfl_item_t *a = _a;
+  w_lfl_item_t *b = _b;
+  wchar_t *a_w_name = a->w_name;
+  wchar_t *b_w_name = b->w_name;
+  int a_m = 0, b_m = 0;
+  int res = 0;
+  if (a->d_type == DT_DIR || (a->d_type == DT_LNK && a->w_name[2] == '/'))
+    a_m |= 1;
+  if (b->d_type == DT_DIR || (b->d_type == DT_LNK && b->w_name[2] == '/'))
+    b_m |= 1;
+
+  if (a_m != b_m)
+    return b_m > a_m;
+
+  if (a->d_type == DT_LNK)
+    a_w_name += 2;
+  if (b->d_type == DT_LNK)
+    b_w_name += 2;
+  res = _strcmp(a_w_name, b_w_name);
+  return res > 0;
+}
+
+static bool fl_clear_cb(void *el_ptr) {
+  w_lfl_item_t *el = el_ptr;
+  free(el->path);
+  free(el->name);
+  free(el->w_name);
+  free(el);
+  return 1;
 }
 
 static int get_files_from_fs(w_lfl_ui_t *fui, char *path) {
   DIR *dir;
   struct dirent *dent;
   char name[257];
-  char d_name[257];
+  wchar_t w_d_name[257];
   char l_path[INBUFSIZE];
-  struct fl_args f_args;
+  w_lfl_item_t f_args;
   ssize_t r = 0;
   fui->files_num = 0;
 
-  w_lfl_item_t *d_start = NULL, *d_current = NULL; /* directories */
-  w_lfl_item_t *f_start = NULL, *f_current = NULL; /* files */
-
   dir = opendir(path);
   if (!dir)
     return 1;
   if (fui->d_path != NULL) {
     free(fui->d_path);
-    lfl_clear(&(fui->start), &(fui->current));
+    fl_clear(fui->f_list);
   }
   fui->d_path = malloc(strlen(path) + 1);
   strcpy(fui->d_path, path);
   while ((dent = readdir(dir)) != NULL) {
     f_args.path = NULL;
     if ((f_args.d_type = dent->d_type) == DT_DIR) {
+      /* -> DIRECTORIES */
       if (!strcmp(dent->d_name, "..")) {
         w_lfl_item_t *t_st = NULL, *t_cur = NULL;
-        sprintf(name, "/%s", dent->d_name);
-        f_args.name = name;
+        wcscpy(w_d_name, L"/..");
+        f_args.name = dent->d_name;
+        f_args.w_name = w_d_name;
         f_args.size = 0;
-        fl_add(&t_st, &t_cur, &f_args);
+        f_args.d_type = dent->d_type;
+        fl_add(fui->f_list, &f_args, true);
         fui->files_num++;
-        /* Always put .. at the beginning */
-        t_st->next = d_start;
-        d_start = t_st;
-        if (d_current == NULL)
-          d_current = t_cur;
         continue;
       }
       /* Hide directories with dot-beginnings */
       if (!strncmp(dent->d_name, ".", 1))
         continue;
-      sprintf(name, "/%s", dent->d_name);
-      f_args.name = name;
-      fl_add(&d_start, &d_current, &f_args);
+      mbstowcs(w_d_name + 1, dent->d_name, 255);
+      w_d_name[0] = '/';
+      f_args.name = dent->d_name;
+      f_args.w_name = w_d_name;
       f_args.size = 0;
+      f_args.d_type = dent->d_type;
+      fl_add_sort(fui->f_list, &f_args);
       fui->files_num++;
+      /* <- DIRECTORIES */
     } else if (f_args.d_type == DT_LNK) {
+      /* -> LINKS */
       sprintf(name, "%s/%s", fui->d_path, dent->d_name);
       r = readlink(name, l_path, INBUFSIZE);
-      sprintf(name, "->/%s", dent->d_name);
-      f_args.name = name;
+      for (int i = 1; l_path[r - 1] == '/'; i++) {
+        l_path[r - 1] = '\0';
+      }
+      wcsncpy(w_d_name, L"->/", 3);
+      mbstowcs(w_d_name + 3, dent->d_name, 253);
+      f_args.name = dent->d_name;
+      f_args.w_name = w_d_name;
       f_args.path = l_path;
       f_args.size = 0;
-      fl_add(&d_start, &d_current, &f_args);
+      f_args.d_type = dent->d_type;
+      fl_add_sort(fui->f_list, &f_args);
       fui->files_num++;
+      /* <- LINKS */
     } else {
+      /* -> FILES */
       /* Hide files with dot-beginnings */
       if (!strncmp(dent->d_name, ".", 1))
         continue;
       f_args.name = dent->d_name;
+      mbstowcs(w_d_name, dent->d_name, 256);
+      f_args.w_name = w_d_name;
       f_args.size = get_file_size(dent->d_name);
-      fl_add(&f_start, &f_current, &f_args);
+      f_args.d_type = dent->d_type;
+      fl_add_sort(fui->f_list, &f_args);
       fui->files_num++;
-      sprintf(name, "%s", dent->d_name);
+      /* <- FILES */
     }
   }
-  if (d_current != NULL)
-    d_current->next = f_start;
-  if (f_start != NULL)
-    f_start->prev = d_current;
 
-  fui->start = d_start;
-  fui->page_start = d_start;
-  fui->current = d_start;
   fui->cur_page = 1;
   fui->pages_num = fui->files_num / fui->max_lines;
   if (fui->files_num % fui->max_lines) {
     fui->pages_num++;
   }
+  fui->page_start = fui->f_list->start;
+  fui->fl_selected = fui->f_list->start;
   return 0;
 }
 
@@ -170,74 +219,75 @@ static void open_selected_item(w_lfl_ui_t *fui, w_cbrp_data *resp_data) {
   char *selection = NULL;
   size_t dp_current;
   char n_path[INBUFSIZE];
-  if (fui->current->d_type == DT_DIR) {
-    if (!strcmp("/..", fui->current->name)) {
+  w_lfl_item_t *selected_item = fui->fl_selected->el_ptr;
+  if (selected_item->d_type == DT_DIR) {
+    if (!strcmp("..", selected_item->name)) {
       strcpy(n_path, fui->d_path);
-      bash_case = strrchr(n_path, '/');
-      if (bash_case != NULL) {
-        *bash_case = '\0';
-        if (get_files_from_fs(fui, n_path)) {
+      if (fui->d_path_previous != NULL) {
+        if (get_files_from_fs(fui, fui->d_path_previous)) {
           w_alert("Can't open the folder!");
           return;
         }
+        free(fui->d_path_previous);
+        fui->d_path_previous = NULL;
+      } else {
+        bash_case = strrchr(n_path, '/');
+        if (bash_case != NULL) {
+          *bash_case = '\0';
+          if (get_files_from_fs(fui, n_path)) {
+            w_alert("Can't open the folder!");
+            return;
+          }
+        }
       }
     } else {
       dp_current = strlen(fui->d_path);
-      selection = fui->current->name + 1;
+      selection = selected_item->name + 1;
       sprintf(n_path, "%s/%s", fui->d_path, selection);
       if (get_files_from_fs(fui, n_path)) {
         w_alert("Can't open the folder!");
         return;
       }
     }
-    fui->current = fui->start;
     fui->current_idx = 0;
     resp_data->code = cbrc_none;
     w_lfl_draw(fui);
-  } else if (fui->current->d_type == DT_REG) {
+  } else if (selected_item->d_type == DT_REG) {
     resp_data->code = cbrp_val;
     resp_data->val.type = val_num;
     resp_data->val.val.num = 1;
-  } else if (fui->current->d_type == DT_LNK) {
-    strcpy(n_path, fui->current->path);
+  } else if (selected_item->d_type == DT_LNK) {
+    strcpy(n_path, selected_item->path);
+    fui->d_path_previous = malloc(sizeof(char) * (strlen(fui->d_path) + 1));
+    strcpy(fui->d_path_previous, fui->d_path);
     if (get_files_from_fs(fui, n_path)) {
       w_alert("Can't open the link!");
       return;
     }
-    fui->current = fui->start;
     fui->current_idx = 0;
     resp_data->code = cbrc_none;
     w_lfl_draw(fui);
   }
 }
 
-/* next page */
 static void page_next(w_lfl_ui_t *fui) {
-  int count = fui->max_lines;
-  w_lfl_item_t *n_page_item = fui->page_start;
   if (fui->cur_page < fui->pages_num) {
-    for (; count >= 0; count--) {
-      n_page_item = n_page_item->next;
-    }
+    dlist_node_t *n_page_item =
+        dlist_wind_fwd(fui->f_list, fui->page_start, fui->max_lines);
     fui->cur_page++;
     fui->page_start = n_page_item;
+    fui->fl_selected = n_page_item;
     fui->current_idx = 0;
-    fui->current = n_page_item;
   }
 }
-
-/* previous page */
 static void page_previous(w_lfl_ui_t *fui) {
-  int count = fui->max_lines;
-  w_lfl_item_t *n_page_item = fui->page_start;
+  dlist_node_t *last_node = fui->page_start->previous;
   if (fui->cur_page > 1) {
-    for (; count >= 0; count--) {
-      n_page_item = n_page_item->prev;
-    }
+    dlist_node_t *n_page_item =
+        dlist_wind_bwd(fui->f_list, fui->page_start, fui->max_lines);
     fui->cur_page--;
-    fui->current =
-        fui->page_start->prev; /* the last element of the previous page */
     fui->page_start = n_page_item;
+    fui->fl_selected = last_node;
     fui->current_idx = fui->max_lines;
   }
 }
@@ -247,32 +297,30 @@ static void w_lfl_cb(w_cb_args_t *args) {
   int32_t key = *((int32_t *)args->data);
   bool is_cur_p = 0; /* current page */
   app_t *app = (app_t *)args->app;
+  dlist_node_t *flwp = dlist_get_wp(fui->f_list);
+  dlist_set_wp(fui->f_list, fui->fl_selected);
   switch (key) {
   case KEY_DOWN:
     is_cur_p = (fui->current_idx % fui->max_lines || fui->current_idx == 0);
-    if (fui->current->next != NULL) {
-      if (is_cur_p) {
-        if (fui->current_idx < fui->max_lines) {
-          fui->current = fui->current->next;
-          fui->current_idx++;
-        }
-      } else { /* is_cur_p */
-        page_next(fui);
+    if (is_cur_p) {
+      if (fui->fl_selected->next != NULL) {
+        fui->fl_selected = fui->fl_selected->next;
+        fui->current_idx++;
       }
-    } else
-      break; /* fui->current->next != NULL */
+    } else { /* is_cur_p */
+      page_next(fui);
+    }
     w_lfl_draw(fui);
     break;
   case KEY_UP:
-    if (fui->current->prev != NULL) {
-      if (fui->current_idx > 0) {
-        fui->current = fui->current->prev;
+    if (fui->current_idx > 0) {
+      if (fui->fl_selected->previous != NULL) {
+        fui->fl_selected = fui->fl_selected->previous;
         fui->current_idx--;
-      } else {
-        page_previous(fui);
       }
-    } else
-      break;
+    } else {
+      page_previous(fui);
+    }
     w_lfl_draw(fui);
     break;
   case KEY_NPAGE:
@@ -285,24 +333,26 @@ static void w_lfl_cb(w_cb_args_t *args) {
     open_selected_item(fui, &(args->resp_data));
     break;
   }
+  dlist_set_wp(fui->f_list, flwp);
 }
 
 w_lfl_ui_t *w_lfl_init(WINDOW **win, w_t *w_parent) {
-  w_lfl_ui_t *fl_ui = malloc(sizeof(w_lfl_ui_t));
+  w_lfl_ui_t *fui = malloc(sizeof(w_lfl_ui_t));
   WINDOW *win_par = *(w_parent->w_parent->parent_win);
-  w_init(&(fl_ui->w), w_parent, win, "");
-  fl_ui->current_idx = 0;
-  fl_ui->win_info = NULL;
-  fl_ui->d_path = NULL;
+  w_init(&(fui->w), w_parent, win, "");
+  fui->current_idx = 0;
+  fui->win_info = NULL;
+  fui->d_path = NULL;
   char *path = get_current_dir_name();
-  get_files_from_fs(fl_ui, path);
-  fl_ui->current = fl_ui->start;
-  fl_ui->w.callback = w_lfl_cb;
-  fl_ui->w.sz.x = getmaxx(win_par) / 10 * 8;
-  fl_ui->w.sz.y = getmaxy(win_par) / 10 * 8;
-  fl_ui->max_lines = 0; /* detects on the first draw */
-  fl_ui->cur_page = 1;
-  return fl_ui;
+  get_files_from_fs(fui, path);
+  fui->f_list = dlist_init(NULL, w_lfl_item_t, NULL);
+  fui->w.callback = w_lfl_cb;
+  fui->w.sz.x = getmaxx(win_par) / 10 * 8;
+  fui->w.sz.y = getmaxy(win_par) / 10 * 8;
+  fui->max_lines = 0; /* detects on the first draw */
+  fui->cur_page = 1;
+  fui->d_path_previous = NULL;
+  return fui;
 }
 
 static void w_lfl_cb_refresh(void *data) {
@@ -347,7 +397,8 @@ static int32_t process_user_input(app_t *app, w_cb_args_t *d_args) {
   if (d_args->resp_data.code == cbrp_val &&
       d_args->resp_data.val.type == val_num &&
       d_args->resp_data.val.val.num == 1) {
-    file_upload_open(fui->d_path, fui->current->name, app->query_args);
+    w_lfl_item_t *file = dlist_get_ptr(fui->fl_selected);
+    file_upload_open(fui->d_path, file->name, app->query_args);
     app->query_args->state = S_UPLOAD_PARAMS;
   }
   return OK;
@@ -364,7 +415,7 @@ w_lfl_ui_t *w_lfl_init_win(app_t *app) {
   app->main_ui.b_keys_len = 2;
   app->main_ui.cb_b_press = (w_cb_press_t)process_user_input;
   app->main_ui.reset = w_lfl_reset_app;
-  app->main_ui.draw = (draw_f_t *) w_lfl_draw;
+  app->main_ui.draw = (draw_f_t *)w_lfl_draw;
   app->active_callback = w_lfl_cb;
   fui->w.callback = w_lfl_cb;
   w_init(&(fui->w), NULL, &(app->win), "");
@@ -375,6 +426,7 @@ w_lfl_ui_t *w_lfl_init_win(app_t *app) {
   fui->w.sz.y = getmaxy(app->win);
   fui->cur_page = 1;
   fui->w.parent_win = &(app->win);
+  fui->f_list = dlist_init(NULL, w_lfl_item_t, NULL);
   /* * INIT UI * */
 
   /* define the width for each sub window */
@@ -392,18 +444,18 @@ w_lfl_ui_t *w_lfl_init_win(app_t *app) {
   /* get files */
   char *path = get_current_dir_name();
   get_files_from_fs(fui, path);
-  fui->current = fui->start;
+  fui->d_path_previous = NULL;
   return fui;
 }
 
-void w_lfl_reset(w_lfl_ui_t *fl_ui) {
-  fl_ui->current_idx = 0;
-  lfl_clear(&(fl_ui->start), &(fl_ui->current));
+void w_lfl_reset(w_lfl_ui_t *fui) {
+  fui->current_idx = 0;
+  fl_clear(fui->f_list);
 }
 
 void w_lfl_reset_app(void *app) {
   app_t *_app = app;
-  w_lfl_ui_t *fl_ui = (w_lfl_ui_t *) _app->main_ui.ui;
+  w_lfl_ui_t *fl_ui = (w_lfl_ui_t *)_app->main_ui.ui;
   w_lfl_reset(fl_ui);
 }
 
@@ -417,8 +469,9 @@ void w_lfl_draw(w_lfl_ui_t *fui) {
 
   p_y = 1;
   p_x = 1;
-  w_lfl_item_t *el = fui->page_start;
-  w_lfl_item_t *active_el = fui->page_start;
+  dlist_set_wp(fui->f_list, fui->page_start);
+  w_lfl_item_t *el = dlist_it_next(fui->f_list);
+  w_lfl_item_t *active_el = dlist_get_ptr(fui->fl_selected);
 
   box(fui->win_list, 0, 0);
   box(fui->win_info, 0, 0);
@@ -428,21 +481,24 @@ void w_lfl_draw(w_lfl_ui_t *fui) {
       p_y++;
       continue;
     }
-    if (el == fui->current) {
+    if (el == fui->fl_selected->el_ptr) {
       wattrset(win, A_BOLD | A_REVERSE);
       active_el = el;
     }
     p_x = 1;
-    p_x += u_utf8_curs_printw(win, &p_y, &p_x, el->name, sz_x_f - 1, false);
+    mvwaddnwstr(win, p_y, p_x, el->w_name, sz_x_f - 1);
+    p_x += wcslen(el->w_name);
+    /* p_x += u_utf8_curs_printw(win, &p_y, &p_x, el->name, sz_x_f - 1, false);
+     */
     int pad = sz_x_f - p_x;
     if (pad >= 0) {
       mvwprintw(win, p_y, p_x, "%*s", pad, "");
     }
-    if (el == fui->current) {
+    if (el == fui->fl_selected->el_ptr) {
       wattroff(win, A_BOLD | A_REVERSE);
     }
     p_y++;
-  } while ((el = el->next) != NULL && p_y < sz_y_f);
+  } while ((el = dlist_it_next(fui->f_list)) != NULL && p_y < sz_y_f);
 
   p_x = 1;
 
@@ -482,7 +538,7 @@ void w_lfl_draw(w_lfl_ui_t *fui) {
 
 void w_lfl_destroy(w_lfl_ui_t **fui) {
   w_lfl_ui_t *f = *fui;
-  lfl_clear(&(f->start), &(f->current));
+  fl_clear(f->f_list);
   free(*fui);
   *fui = NULL;
 }

src/windows/fs_file_list.h

@@ -4,8 +4,9 @@
 #ifndef W_LFL_H /* LOCAL FILE LIST */
 #define W_LFL_H
 
-#include "../app.h"
+#include "dlist.h"
 #include <stddef.h>
+#include <wchar.h>
 #include <widget_core.h>
 #include <ncursesw/ncurses.h>
 #include <stdint.h>
@@ -14,18 +15,13 @@
 typedef struct fs_fl_item {
   char *name;
   char *path;
-  char *d_name;
+  wchar_t *w_name;
   size_t size;
-  struct fs_fl_item *next;
-  struct fs_fl_item *prev;
   u_char d_type;
 } w_lfl_item_t;
 
 typedef struct {
     w_t w;
-    w_lfl_item_t *current;
-    w_lfl_item_t *start;
-    w_lfl_item_t *page_start;
     int32_t current_idx;
     int32_t max_lines;
     int32_t cur_page;
@@ -34,6 +30,10 @@ typedef struct {
     WINDOW *win_info;
     WINDOW *win_list;
     char *d_path;
+    char *d_path_previous;
+    dlist_t *f_list;
+    dlist_node_t *page_start;
+    dlist_node_t *fl_selected;
 } w_lfl_ui_t;
 
 void        w_lfl_draw(w_lfl_ui_t *fl_ui);

src/windows/main_window.c

@@ -6,6 +6,9 @@
 #include "fs_file_list.h"
 #include "text_edit.h"
 
+#include <core/app.h>
+#include <widget/dialogue.h>
+
 void main_window_set(app_t *app, enum main_window_type type) {
   if (app->main_ui.ui != NULL) {
     main_window_destroy(app);

src/windows/main_window.h

@@ -4,7 +4,7 @@
 #ifndef MAIN_WINDOW_H
 #define MAIN_WINDOW_H
 
-#include "../app.h"
+#include <common.h>
 
 void main_window_set(app_t *app, enum main_window_type type);
 void main_window_draw(app_t *app);

src/windows/text_edit.c

@@ -1,9 +1,6 @@
 /* SPDX-License-Identifier: MIT */
 /* Copyright (c) 2026 Oleksandr Zhylin */
 
-#include "../file_processor.h"
-#include "../server.h"
-#include "../windows/main_window.h"
 #include <dirent.h>
 #include <fcntl.h>
 #include <ncursesw/ncurses.h>
@@ -17,10 +14,15 @@
 #include <utils.h>
 #include <wchar.h>
 
+#include <core/file_processor.h>
+#include <core/server.h>
+#include <core/app.h>
+
 #include "d_array.h"
-#include "text_edit.h"
 #include "file_list.h"
+#include "text_edit.h"
 #include "widget_core.h"
+#include "main_window.h"
 
 /* TODO: расширять capacity линии при достижении лимита */
 
@@ -210,6 +212,9 @@ static int32_t process_user_input(app_t *app, w_cb_args_t *d_args) {
     /* Save */
     break;
   case KEY_F(8):
+    server_send_string(app->query_args, "[Empty description]\n:END:\n");
+    app->query_args->state = S_WAIT_SERVER;
+    app->callback_after_notification = callback_after_notification;
     /* Cancel */
     break;
   default:

src/windows/text_edit.h

@@ -4,7 +4,6 @@
 #ifndef W_TEXT_EDIT_H /* LOCAL FILE LIST */
 #define W_TEXT_EDIT_H
 
-#include "../app.h"
 #include <ncursesw/ncurses.h>
 #include <stddef.h>
 #include <stdint.h>

test/CMakeLists.txt

@@ -1,13 +1 @@
-project("My Awesome Tested Project" C)  
-cmake_minimum_required(VERSION 3.0)  # Let's tell it a bit about our environment 
-SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)  # We declare a variable to select what to build 
-set (TARGET_GROUP production CACHE STRING "What Should I Build?")  # Modules that exist in both our release and our unit tests, are added now   
-add_subdirectory(src)   if(TARGET_GROUP STREQUAL release) # If we had any files that ONLY were compiled into our release, for example startup code,   
-# it's really handy to put it here.  
-elseif(TARGET_GROUP STREQUAL test) # Our tests need to let CTest know we're running tests    
-include(CTest)  # It also needs to understand we have code in source and test directories  
-add_subdirectory(unity)    
-add_subdirectory(test)  
-else()    
-message(FATAL_ERROR "I don't know the TARGET_GROUP you gave me!") 
-endif()
+add_subdirectory(utils)

test/utils/CMakeLists.txt

@@ -0,0 +1,13 @@
+# ---/ process_client_command /--------------------------------------
+
+add_executable(test_dlist
+    dlist.c
+)
+
+target_link_libraries(test_dlist
+    cmocka
+    common
+    utils
+)
+
+add_test(NAME utils_dlist COMMAND test_dlist)

test/utils/dlist.c

@@ -0,0 +1,222 @@
+#include <cmocka.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <utils/dlist.h>
+
+typedef struct {
+  int num;
+  char *text;
+  char buf[128];
+} test_t;
+
+bool dblist_add_cb(void *dst, void *src) {
+  // test_t *dst = _dst;
+  // test_t *src = _src;
+  memcpy(dst, src, sizeof(test_t));
+  return true;
+}
+
+#define tlist_add(dlist, item, prepend)                                        \
+  dlist_add(dlist, item, test_t, dblist_add_cb, prepend);
+
+#define LOREM_IPSUM                                                            \
+  "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod "   \
+  "tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim "      \
+  "veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea "   \
+  "commodo consequat. Duis aute irure dolor in reprehenderit in voluptate "    \
+  "velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint "         \
+  "occaecat cupidatat non proident, sunt in culpa qui officia deserunt "       \
+  "mollit anim id est laborum."
+
+void test__init(void **state) {
+  test_t t = {.buf = "TEST BUF", .num = 123, .text = LOREM_IPSUM};
+
+  dlist_t *dlist = dlist_init(&t, test_t, dblist_add_cb);
+  assert_int_equal(dlist->len, 1);
+  test_t *dt_ptr = dlist->current->el_ptr;
+  assert_int_equal(dt_ptr->num, t.num);
+  assert_string_equal(dt_ptr->buf, t.buf);
+  assert_ptr_equal(dt_ptr->text, LOREM_IPSUM);
+}
+
+void test__add_several_times(void **state) {
+  test_t t1 = {.buf = "TEST BUF", .num = 123, .text = LOREM_IPSUM};
+  test_t t2 = {.buf = "TEST 1 BUF", .num = 11, .text = "RAND 1 TEXT"};
+  test_t t3 = {.buf = "TEST 2 BUF", .num = 22, .text = "RAND 2 TEXT"};
+
+  dlist_t *dlist = dlist_init(NULL, test_t, NULL);
+
+  dlist_add(dlist, &t1, test_t, dblist_add_cb, false);
+  dlist_add(dlist, &t2, test_t, dblist_add_cb, false);
+  dlist_add(dlist, &t3, test_t, dblist_add_cb, false);
+
+  assert_int_equal(dlist->len, 3);
+
+  test_t *dl_t1 = dlist->start->el_ptr;
+  test_t *dl_t2 = dlist->start->next->el_ptr;
+  test_t *dl_t3 = dlist->current->el_ptr;
+
+  assert_memory_equal(dl_t1, &t1, sizeof(test_t));
+  assert_memory_equal(dl_t2, &t2, sizeof(test_t));
+  assert_memory_equal(dl_t3, &t3, sizeof(test_t));
+}
+
+void test__add_several_times_prepend(void **state) {
+  test_t t1 = {.buf = "TEST BUF", .num = 123, .text = LOREM_IPSUM};
+  test_t t2 = {.buf = "TEST 1 BUF", .num = 11, .text = "RAND 1 TEXT"};
+  test_t t3 = {.buf = "TEST 2 BUF", .num = 22, .text = "RAND 2 TEXT"};
+
+  dlist_t *dlist = dlist_init(NULL, test_t, NULL);
+
+  dlist_add(dlist, &t1, test_t, dblist_add_cb, true);
+  dlist_add(dlist, &t2, test_t, dblist_add_cb, true);
+  dlist_add(dlist, &t3, test_t, dblist_add_cb, true);
+
+  assert_int_equal(dlist->len, 3);
+
+  test_t *dl_t1 = dlist->current->el_ptr;
+  test_t *dl_t2 = dlist->current->previous->el_ptr;
+  test_t *dl_t3 = dlist->start->el_ptr;
+
+  assert_memory_equal(dl_t1, &t1, sizeof(test_t));
+  assert_memory_equal(dl_t2, &t2, sizeof(test_t));
+  assert_memory_equal(dl_t3, &t3, sizeof(test_t));
+}
+
+void test__add_and_iterate(void **state) {
+  test_t t1 = {.buf = "TEST BUF", .num = 123, .text = LOREM_IPSUM};
+  test_t t2 = {.buf = "TEST 1 BUF", .num = 11, .text = "RAND 1 TEXT"};
+  test_t t3 = {.buf = "TEST 2 BUF", .num = 22, .text = "RAND 2 TEXT"};
+
+  dlist_t *dlist = dlist_init(NULL, test_t, NULL);
+
+  dlist_add(dlist, &t1, test_t, dblist_add_cb, false);
+  dlist_add(dlist, &t2, test_t, dblist_add_cb, false);
+  dlist_add(dlist, &t3, test_t, dblist_add_cb, false);
+
+  test_t *dl_t3 = dlist_it_prev(dlist);
+  test_t *dl_t2 = dlist_it_prev(dlist);
+  test_t *dl_t1 = dlist_it_prev(dlist);
+
+  assert_memory_equal(dl_t1, &t1, sizeof(test_t));
+  assert_memory_equal(dl_t2, &t2, sizeof(test_t));
+  assert_memory_equal(dl_t3, &t3, sizeof(test_t));
+}
+
+bool _sort(void *_a, void *_b) {
+  test_t *a = _a;
+  test_t *b = _b;
+
+  return a->num > b->num;
+}
+
+#define T_BUF "TEST BUF "
+#define T_TEXT "RAND TEXT "
+#define T_IT_NUM 120
+
+void test__insert_sort(void **state) {
+  srand(time(NULL));
+
+  test_t t = {.text = T_TEXT};
+  dlist_t *dlist = dlist_init(NULL, test_t, NULL);
+
+  for (int i = 0; i < T_IT_NUM; i++) {
+    sprintf(t.buf, "%s %d", T_BUF, i);
+    t.num = rand();
+    dlist_add_sort(dlist, &t, test_t, _sort, dblist_add_cb);
+  }
+
+  test_t *t1, *t2;
+
+  t2 = dlist_it_prev(dlist);
+  t1 = dlist_it_prev(dlist);
+
+  assert_int_in_range(t2->num, t1->num, INT_MAX);
+
+  for (int i = T_IT_NUM - 2; i > 0; i--) {
+    t2 = t1;
+    t1 = dlist_it_prev(dlist);
+    assert_int_in_range(t2->num, t1->num, INT_MAX);
+  }
+}
+
+int delete_times = 0;
+test_t *b_ptr = NULL;
+
+bool delete_cb(void *el_ptr) {
+  assert_int_equal(b_ptr, el_ptr);
+  delete_times++;
+  return 1;
+}
+
+void test__remove_by_ptr(void **state) {
+  test_t ta = {.buf = "TEST A", .num = 123, .text = "TEXT A"};
+  test_t tb = {.buf = "TEST B", .num = 456, .text = "TEXT B"};
+  test_t tc = {.buf = "TEST C", .num = 789, .text = "TEXT C"};
+  dlist_t *dlist = dlist_init(NULL, int, NULL);
+
+  tlist_add(dlist, &ta, false);
+  tlist_add(dlist, &tb, false);
+  tlist_add(dlist, &tc, false);
+
+  b_ptr = dlist->start->next->el_ptr;
+  assert_int_equal(tb.num, 456);
+
+  dlist_remove_by_ptr(dlist, b_ptr, delete_cb);
+  assert_ptr_equal(dlist->start->next, dlist->current);
+  assert_ptr_equal(dlist->current->previous, dlist->start);
+  assert_int_equal(dlist->len, 2);
+  assert_int_equal(delete_times, 1);
+  test_t *a_ptr = dlist->start->el_ptr;
+  test_t *c_ptr = dlist->start->next->el_ptr;
+  assert_int_equal(a_ptr->num, 123);
+  assert_int_equal(c_ptr->num, 789);
+}
+
+int clean_db_call_times = 0;
+
+bool clean_db(void *ptr) {
+  free(ptr);
+  clean_db_call_times++;
+  return 1;
+}
+
+void test__clear_list(void **state) {
+  test_t ta = {.buf = "TEST A", .num = 123, .text = "TEXT A"};
+  test_t tb = {.buf = "TEST B", .num = 456, .text = "TEXT B"};
+  test_t tc = {.buf = "TEST C", .num = 789, .text = "TEXT C"};
+
+  dlist_t *dlist = dlist_init(NULL, int, NULL);
+
+  tlist_add(dlist, &ta, false);
+  tlist_add(dlist, &tb, false);
+  tlist_add(dlist, &tc, false);
+
+  assert_int_equal(dlist->len, 3);
+  dlist_clear_list(dlist, clean_db);
+  assert_int_equal(dlist->len, 0);
+  assert_ptr_equal(dlist->current, NULL);
+  assert_ptr_equal(dlist->start, NULL);
+  assert_int_equal(clean_db_call_times, 3);
+  clean_db_call_times = 0;
+}
+
+int setup(void **state) { return 0; }
+int tear_down(void **state) { return 0; }
+
+int main(int argc, char **argv) {
+  const struct CMUnitTest tests[] = {
+      cmocka_unit_test(test__init),
+      cmocka_unit_test(test__add_several_times),
+      cmocka_unit_test(test__add_several_times_prepend),
+      cmocka_unit_test(test__add_and_iterate),
+      cmocka_unit_test(test__insert_sort),
+      cmocka_unit_test(test__remove_by_ptr),
+      cmocka_unit_test(test__clear_list),
+  };
+
+  return cmocka_run_group_tests(tests, setup, tear_down);
+}