Completely new text viewer app (proper newlines)

Code borrowed from archive app show scene, will be used to replace that

applications/external/text_viewer/scenes/text_viewer_scene.c

@@ -0,0 +1,30 @@
+#include "text_viewer_scene.h"
+
+// Generate scene on_enter handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_enter,
+void (*const text_viewer_on_enter_handlers[])(void*) = {
+#include "text_viewer_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_event handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_event,
+bool (*const text_viewer_on_event_handlers[])(void* context, SceneManagerEvent event) = {
+#include "text_viewer_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_exit,
+void (*const text_viewer_on_exit_handlers[])(void* context) = {
+#include "text_viewer_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Initialize scene handlers configuration structure
+const SceneManagerHandlers text_viewer_scene_handlers = {
+    .on_enter_handlers = text_viewer_on_enter_handlers,
+    .on_event_handlers = text_viewer_on_event_handlers,
+    .on_exit_handlers = text_viewer_on_exit_handlers,
+    .scene_num = TextViewerSceneNum,
+};

applications/external/text_viewer/scenes/text_viewer_scene.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gui/scene_manager.h>
+
+// Generate scene id and total number
+#define ADD_SCENE(prefix, name, id) TextViewerScene##id,
+typedef enum {
+#include "text_viewer_scene_config.h"
+    TextViewerSceneNum,
+} TextViewerScene;
+#undef ADD_SCENE
+
+extern const SceneManagerHandlers text_viewer_scene_handlers;
+
+// Generate scene on_enter handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_enter(void*);
+#include "text_viewer_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_event handlers declaration
+#define ADD_SCENE(prefix, name, id) \
+    bool prefix##_scene_##name##_on_event(void* context, SceneManagerEvent event);
+#include "text_viewer_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_exit(void* context);
+#include "text_viewer_scene_config.h"
+#undef ADD_SCENE

applications/external/text_viewer/scenes/text_viewer_scene_config.h

@@ -0,0 +1 @@
+ADD_SCENE(text_viewer, show, Show)

applications/external/text_viewer/scenes/text_viewer_scene_show.c

@@ -0,0 +1,132 @@
+#include "../text_viewer.h"
+
+#define SHOW_MAX_FILE_SIZE 8000
+
+void text_viewer_scene_show_widget_callback(GuiButtonType result, InputType type, void* context) {
+    furi_assert(context);
+    TextViewer* app = (TextViewer*)context;
+    if(type == InputTypeShort) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, result);
+    }
+}
+
+static bool text_show_read_lines(File* file, FuriString* str_result) {
+    //furi_string_reset(str_result);
+    uint8_t buffer[SHOW_MAX_FILE_SIZE];
+
+    uint16_t read_count = storage_file_read(file, buffer, SHOW_MAX_FILE_SIZE);
+    if(storage_file_get_error(file) != FSE_OK) {
+        return false;
+    }
+
+    for(uint16_t i = 0; i < read_count; i++) {
+        furi_string_push_back(str_result, buffer[i]);
+    }
+
+    return true;
+}
+
+void text_viewer_scene_show_on_enter(void* context) {
+    furi_assert(context);
+    TextViewer* app = context;
+
+    FuriString* buffer;
+    buffer = furi_string_alloc();
+
+    Storage* storage = furi_record_open(RECORD_STORAGE);
+    File* file = storage_file_alloc(storage);
+
+    FileInfo fileinfo;
+    FS_Error error = storage_common_stat(storage, furi_string_get_cstr(app->path), &fileinfo);
+    if(error == FSE_OK) {
+        if((fileinfo.size < SHOW_MAX_FILE_SIZE) && (fileinfo.size > 2)) {
+            bool ok = storage_file_open(
+                file, furi_string_get_cstr(app->path), FSAM_READ, FSOM_OPEN_EXISTING);
+            if(ok) {
+                if(!text_show_read_lines(file, buffer)) {
+                    goto text_file_read_err;
+                }
+                if(!furi_string_size(buffer)) {
+                    goto text_file_read_err;
+                }
+
+                storage_file_seek(file, 0, true);
+
+                widget_add_text_scroll_element(
+                    app->widget, 0, 0, 128, 64, furi_string_get_cstr(buffer));
+
+            } else {
+            text_file_read_err:
+                widget_add_text_box_element(
+                    app->widget,
+                    0,
+                    0,
+                    128,
+                    64,
+                    AlignLeft,
+                    AlignCenter,
+                    "\e#Error:\nStorage file open error\e#",
+                    false);
+            }
+            storage_file_close(file);
+        } else if(fileinfo.size < 2) {
+            widget_add_text_box_element(
+                app->widget,
+                0,
+                0,
+                128,
+                64,
+                AlignLeft,
+                AlignCenter,
+                "\e#Error:\nFile is too small\e#",
+                false);
+        } else {
+            widget_add_text_box_element(
+                app->widget,
+                0,
+                0,
+                128,
+                64,
+                AlignLeft,
+                AlignCenter,
+                "\e#Error:\nFile is too large to show\e#",
+                false);
+        }
+    } else {
+        widget_add_text_box_element(
+            app->widget,
+            0,
+            0,
+            128,
+            64,
+            AlignLeft,
+            AlignCenter,
+            "\e#Error:\nFile system error\e#",
+            false);
+    }
+
+    furi_string_free(buffer);
+
+    storage_file_free(file);
+    furi_record_close(RECORD_STORAGE);
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, TextViewerViewWidget);
+}
+
+bool text_viewer_scene_show_on_event(void* context, SceneManagerEvent event) {
+    furi_assert(context);
+    TextViewer* app = (TextViewer*)context;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        scene_manager_previous_scene(app->scene_manager);
+        return true;
+    }
+    return false;
+}
+
+void text_viewer_scene_show_on_exit(void* context) {
+    furi_assert(context);
+    TextViewer* app = (TextViewer*)context;
+
+    widget_reset(app->widget);
+}