LVGL

https://docs.lvgl.io
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### Start LVGL Subsystem with BSP

Source: https://docs.lvgl.io/9.5/integration/chip_vendors/espressif/add_lvgl_to_esp32_idf_project.html

Example of starting the LVGL subsystem using the BSP display start function and running a demo. This approach handles background task management for lv_timer_handler.

```c
void app_main(void)
{
    bsp_display_start();
    bsp_display_backlight_on();

    bsp_display_lock(0);
    lv_demo_benchmark();
    bsp_display_unlock();
}
```

--------------------------------

### Compile for Node Example

Source: https://docs.lvgl.io/9.5/details/xml/tools/cli.html

Example of compiling a project specifically for the Node.js target, including starting the service.

```bash
lved-cli.js compile ./examples/my-project --target node --start-service
```

--------------------------------

### Compare Example

Source: https://docs.lvgl.io/9.5/details/xml/tools/cli.html

Example of comparing a generated build directory against a reference tree.

```bash
lved-cli.js compare build/generated ./ci/reference
```

--------------------------------

### Example Setup for Subject Group Observer

Source: https://docs.lvgl.io/9.5/main-modules/observer/observer.html

Sets up multiple subjects, a subject group, and attaches an observer to the group. This example demonstrates how to connect individual subjects (mode, value, unit) into a group that triggers a single observer callback.

```c
lv_obj_t * label = lv_label_create(lv_screen_active());

lv_subject_t subject_mode;  // Voltage or Current
lv_subject_t subject_value; // Measured value
lv_subject_t subject_unit;  // The unit
lv_subject_t subject_all;   // Subject group that connects the above 3 Subjects
lv_subject_t * subject_list[3] = {&subject_mode, &subject_value, &subject_unit};  // The elements of the group

lv_subject_init_int(&subject_mode, 0); // Let's say 0 is Voltage, 1 is Current
lv_subject_init_int(&subject_value, 0);
lv_subject_init_pointer(&subject_unit, "V");
lv_subject_init_group(&subject_all, subject_list, 3);

lv_subject_add_observer_obj(&subject_all, all_observer_cb, label, NULL);
```

--------------------------------

### Install Yocto SDK

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/yocto/lvgl_recipe.html

Execute the generated SDK script to install the development environment on your host machine. Specify your preferred installation directory.

```bash
$ ./sdk/poky-glibc-x86_64-core-image-base-cortexa53-raspberrypi3-64-toolchain-5.0.4.sh
Poky (Yocto Project Reference Distro) SDK installer version 5.0.4
=================================================================
Enter target directory for SDK (default: /opt/poky/5.0.4): /opt/poky/sdk-with-lvgl
You are about to install the SDK to "/opt/poky/sdk-with-lvgl". Proceed [Y/n]? y

```

--------------------------------

### Minimal UEFI LVGL Example

Source: https://docs.lvgl.io/9.5/integration/pc/uefi.html

A minimal example demonstrating the initialization and basic usage of LVGL within a UEFI environment. This includes setting up display, input devices, and running a demo.

```c
#include "lvgl/lvgl.h"
#include "lvgl/examples/lv_examples.h"
#include "lvgl/demos/lv_demos.h"

EFI_STATUS EFIAPI EfiMain(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
{
    lv_uefi_init(ImageHandle, SystemTable);
    lv_init();

    if (!lv_is_initialized()) return EFI_NOT_READY;

    EFI_HANDLE handle = lv_uefi_display_get_active();
    if (!handle) handle = lv_uefi_display_get_any();
    if (!handle) {
        lv_deinit();
        return EFI_UNSUPPORTED;
    }

    lv_display_t *display = lv_uefi_display_create(handle);
    lv_display_set_default(display);

    lv_group_t *group = lv_group_create();
    lv_group_set_default(group);

    lv_obj_t *cursor = lv_image_create(lv_layer_top());
    lv_image_set_src(cursor, "E:cursor.png");

    lv_indev_t *indev;

    indev = lv_uefi_simple_text_input_indev_create();
    lv_indev_set_group(indev, group);
    lv_uefi_simple_text_input_indev_add_all(indev);

    indev = lv_uefi_simple_pointer_indev_create(NULL);
    lv_uefi_simple_pointer_indev_add_all(indev);
    lv_indev_set_cursor(indev, cursor);

    indev = lv_uefi_absolute_pointer_indev_create(NULL);
    lv_uefi_absolute_pointer_indev_add_all(indev);

    lv_demo_widgets();

    size_t counter = 0;
    while (counter < 10000) {
        counter++;
        gBS->Stall(1000);
        lv_tick_inc(1);
        lv_timer_handler();
    }

    return EFI_SUCCESS;
}

```

--------------------------------

### Simple LVGL Button Example in Berry

Source: https://docs.lvgl.io/9.5/integration/framework/tasmota-berry.html

Demonstrates creating a basic LVGL screen, a button, and a label within that button using the Berry scripting language integrated with Tasmota. This is a starting point for GUI development.

```berry
lv.start()                 # start LVGL
scr = lv.screen_active()         # get default screen
btn = lv.btn(scr)          # create button
btn.center()
label = lv.label(btn)      # create a label in the button
label.set_text("Button")   # set a label to the button

```

--------------------------------

### Arduino Example for NV3007 Display with SPI

Source: https://docs.lvgl.io/9.5/integration/external_display_controllers/nv3007.html

This example demonstrates how to initialize and use the NV3007 display with LVGL on an Arduino platform via SPI. It includes platform-specific functions for SPI communication and display setup.

```c
#include <lvgl.h>

/* Platform-specific includes */
#include <SPI.h>

#define LCD_DC 21
#define LCD_CS 5
#define LCD_RST 4
#define LCD_SCK 18
#define LCD_MOSI 23
#define LCD_MISO -1
#define LCD_BL 15
#define SPI_CLK 40000000

#define BUFFER_SIZE 142 * 50
uint8_t buf[BUFFER_SIZE];

/*  Define your platform-specific functions to send commands and data */
void my_lcd_send_cmd(lv_display_t *disp, const uint8_t *cmd, size_t cmd_size, const uint8_t *param, size_t param_size)
{
    SPI.beginTransaction(SPISettings(SPI_CLK, MSBFIRST, SPI_MODE0));
    /* Send command */
    digitalWrite(LCD_DC, LOW); /* command mode */
    digitalWrite(LCD_CS, LOW); /* CS low */
    SPI.transferBytes(cmd, NULL, cmd_size);

    /* Send parameters (if any) */
    if (param != NULL && param_size > 0)
    {
        digitalWrite(LCD_DC, HIGH); /* data mode */
        SPI.transferBytes(param, NULL, param_size);
    }
    digitalWrite(LCD_CS, HIGH); /* CS high */
    SPI.endTransaction();
}

void my_lcd_send_color(lv_display_t *disp, const uint8_t *cmd, size_t cmd_size, uint8_t *param, size_t param_size)
{
    SPI.beginTransaction(SPISettings(SPI_CLK, MSBFIRST, SPI_MODE0));
    digitalWrite(LCD_CS, LOW);

    /* Send the command first */
    digitalWrite(LCD_DC, LOW);
    SPI.transferBytes(cmd, NULL, cmd_size);

    /* Then send the pixel data */
    if (param && param_size > 0)
    {
        digitalWrite(LCD_DC, HIGH);
        SPI.transferBytes(param, NULL, param_size);
    }

    digitalWrite(LCD_CS, HIGH);
    SPI.endTransaction();

    /* Important: signal LVGL that we're done */
    lv_display_flush_ready(disp);
}

void setup()
{

    pinMode(LCD_BL, OUTPUT);
    digitalWrite(LCD_BL, HIGH); /*  turn on backlight */

    pinMode(LCD_DC, OUTPUT);
    pinMode(LCD_CS, OUTPUT);
    pinMode(LCD_RST, OUTPUT);
    /*  reset sequence */
    digitalWrite(LCD_RST, HIGH);
    delay(100);
    digitalWrite(LCD_RST, LOW);
    delay(120);
    digitalWrite(LCD_RST, HIGH);
    delay(120);

    SPI.begin(LCD_SCK, LCD_MISO, LCD_MOSI, LCD_CS); /*  SCK, MISO, MOSI, SS */

    digitalWrite(LCD_CS, HIGH); /*  disable device */
    delay(100);             /*  wait for device to stabilize */

    lv_init();

    lv_tick_set_cb(my_tick);

    /*  Create NV3007 display */
    lv_display_t *disp = lv_nv3007_create(142, 428, LV_LCD_FLAG_NONE, my_lcd_send_cmd, my_lcd_send_color);
    lv_nv3007_set_gap(disp, 0, 14);
    lv_display_set_rotation(disp, LV_DISPLAY_ROTATION_270);
    lv_display_set_color_format(disp, LV_COLOR_FORMAT_RGB565_SWAPPED);
    lv_display_set_buffers(disp, buf, NULL, BUFFER_SIZE, LV_DISP_RENDER_MODE_PARTIAL);

    /*  Create a simple label on the display */
    lv_obj_t *label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "Hello NV3007!");
    lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
}

void loop()
{
    lv_task_handler();
    delay(5);
}

```

--------------------------------

### PikaScript Compilation and Binding Process

Source: https://docs.lvgl.io/9.5/integration/bindings/pikascript.html

Example output from the PikaScript pre-compiler, showing package installation and the scanning/binding process for a Python interface file.

```bash
$ ./rust-msc-latest-win10.exe
(pikascript) packages installed:
    pikascript-core==v1.10.0
    PikaStdLib==v1.10.0
    PikaStdDevice==v1.10.0
(pikascript) pika compiler:
  scanning main.py...
    binding pika_lvgl.pyi...

```

--------------------------------

### Install WSL (Windows)

Source: https://docs.lvgl.io/9.5/xml/editor/install.html

Install the Windows Subsystem for Linux if it is not already present.

```bash
wsl --install
```

--------------------------------

### Enable LVGL Examples and Demos

Source: https://docs.lvgl.io/9.5/integration/building/cmake.html

Enables the building of demos and examples for LVGL. This is useful for testing and learning purposes.

```cmake
set(CONFIG_LV_BUILD_EXAMPLES ON)
set(CONFIG_LV_BUILD_DEMOS ON)
add_subdirectory(lvgl)
```

--------------------------------

### Install LVGL Files

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/yocto/lvgl_recipe.html

Installs the compiled LVGL library files, including headers and shared objects, into the destination installation directory `${D}`.

```bash
bitbake lvgl -c install
```

--------------------------------

### Example: Asynchronous Screen Cleanup

Source: https://docs.lvgl.io/9.5/main-modules/timer.html

Example demonstrating how to schedule a screen cleanup function to run asynchronously after the current operations are complete. Requires locking the LVGL mutex.

```c
void my_screen_clean_up(void * scr)
{
  /* Free some resources related to `scr`*/

  /* Finally delete the screen */
  lv_obj_delete(scr);
}

...

/* Do something with the Widget on the current screen */

/* Delete screen on next call of `lv_timer_handler`, not right now. */
lv_lock();
lv_async_call(my_screen_clean_up, lv_screen_active());
lv_unlock();

/* The screen is still valid so you can do other things with it */
```

--------------------------------

### Install Buildroot Prerequisites on Ubuntu

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/image_generation.html

Installs essential packages required by Buildroot using Ubuntu's apt package manager.

```bash
sudo apt install sed make binutils gcc g++ bash patch gzip bzip2 perl tar \
        cpio python3 unzip rsync wget libncurses-dev
```

--------------------------------

### Unix-like File System Path Examples

Source: https://docs.lvgl.io/9.5/overview/fs.html

Examples of file paths for Unix-like systems when using the LVGL file system abstraction, prefixed with an identifier letter.

```text
"Z:/etc/images/splash.png"

```

```text
"Z:/etc/images/left_button.png"

```

```text
"Z:/etc/images/right_button.png"

```

```text
"Z:/home/users/me/wip/proposal.txt"

```

--------------------------------

### Unix-like File Path Examples

Source: https://docs.lvgl.io/9.5/main-modules/fs.html

Examples of file paths using a 'Z:' identifier for LVGL to select the appropriate file system driver on Unix-like systems.

```text
"Z:/etc/images/splash.png"
"Z:/etc/images/left_button.png"
"Z:/etc/images/right_button.png"
"Z:/home/users/me/wip/proposal.txt"

```

--------------------------------

### Get Start Value

Source: https://docs.lvgl.io/9.5/API/widgets/bar/lv_bar_h.html

Retrieves the start value of the bar.

```APIDOC
## lv_bar_get_start_value

### Description
Get the start value of a bar.

### Parameters
* **obj** (const lv_obj_t *) - pointer to a bar object

### Returns
* int32_t - the start value of the bar
```

--------------------------------

### LVGL QNX 'Hello World' Application Example

Source: https://docs.lvgl.io/9.5/integration/rtos/qnx.html

This code demonstrates how to initialize LVGL, create a window, add input devices, and display a 'Hello world' message on QNX.

```c
#include <lvgl.h>

int
main(int argc, char **argv)
{
    /* Initialize the library. */
    lv_init();

    /* Create a 800x480 window. */
    lv_display_t *disp = lv_qnx_window_create(800, 480);
    lv_qnx_window_set_title(disp, "LVGL Example");

    /* Add keyboard and mouse devices. */
    lv_qnx_add_keyboard_device(disp);
    lv_qnx_add_pointer_device(disp);

    /* Generate the UI. */
    lv_obj_set_style_bg_color(lv_screen_active(), lv_color_hex(0x003a57), LV_PART_MAIN);

    lv_obj_t * label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "Hello world");
    lv_obj_set_style_text_color(lv_screen_active(), lv_color_hex(0xffffff), LV_PART_MAIN);
    lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);

    /* Run the event loop until it exits. */
    return lv_qnx_event_loop(disp);
}

```

--------------------------------

### Install NuttX Prerequisites on Linux

Source: https://docs.lvgl.io/9.5/details/integration/os/nuttx.html

Installs necessary development tools for NuttX on a Linux system, including build tools, libraries, and cross-compilation toolchains.

```bash
$ sudo apt-get install automake bison build-essential flex gcc-arm-none-eabi gperf git libncurses5-dev libtool libusb-dev libusb-1.0.0-dev pkg-config kconfig-frontends openocd

```

--------------------------------

### Build and Install SDK

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/quick_setup.html

Navigate to the output directory, build the SDK, and extract it to a specified location for application compilation.

```bash
cd output
make sdk
mkdir -p ~/sdk
tar -xzf images/aarch64-buildroot-linux-gnu_sdk-buildroot.tar.gz -C ~/sdk

```

--------------------------------

### Basic LVGL Integration Example

Source: https://docs.lvgl.io/9.5/getting_started/learn_the_basics.html

This example demonstrates the fundamental steps for integrating LVGL into a project, including initialization, setting up a display buffer and flush callback, creating a simple label widget, and running the LVGL timer handler in a loop.

```c
void main(void)
{
    your_driver_init();

    lv_init();

    lv_tick_set_cb(my_get_millis);

    lv_display_t * display = lv_display_create(320, 240);

    /* LVGL will render to this 1/10 screen sized buffer for 2 bytes/pixel */
    static uint8_t buf[320 * 240 / 10 * 2];
    lv_display_set_buffers(display, buf, NULL, LV_DISPLAY_RENDER_MODE_PARTIAL);

    /* This callback will display the rendered image */
    lv_display_set_flush_cb(display, my_flush_cb);

    /* Create widgets */
    lv_obj_t * label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "Hello LVGL!");

    /* Make LVGL periodically execute its tasks */
    while(1) {
        /* Provide updates to currently-displayed Widgets here. */
        lv_timer_handler();
        my_sleep(5);  /*Wait 5 milliseconds before processing LVGL timer again*/
    }
}

/* Return the elapsed milliseconds since startup.
 * It needs to be implemented by the user */
uint32_t my_get_millis(void)
{
    return my_tick_ms;
}

/* Copy rendered image to screen.
 * This needs to be implemented by the user. */
void my_flush_cb(lv_display_t * disp, const lv_area_t * area, uint8_t * px_buf)
{
    /* Show the rendered image on the display */
    my_display_update(area, px_buf);

    /* Indicate that the buffer is available.
     * If DMA were used, call in the DMA complete interrupt. */
    lv_display_flush_ready();
}

```

--------------------------------

### Get Text Selection

Source: https://docs.lvgl.io/9.5/API/widgets/label/lv_label_h.html

Retrieves the start and end positions of the text selection in the label.

```APIDOC
## lv_label_get_text_selection_start()

### Description
Gets the starting character index of the text selection.

### Parameters
- **label**: `lv_obj_t*` - Pointer to the label widget.

### Returns
- `uint32_t`: The starting character index of the selection.
```

```APIDOC
## lv_label_get_text_selection_end()

### Description
Gets the ending character index of the text selection.

### Parameters
- **label**: `lv_obj_t*` - Pointer to the label widget.

### Returns
- `uint32_t`: The ending character index of the selection.
```

--------------------------------

### Create Project Directory and Download Sources

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/torizon/torizon_os.html

Sets up the project directory structure and clones the necessary LVGL and porting repositories. Ensure Git is installed.

```bash
mkdir -p ~/lvgl_torizon_os/
cd ~/lvgl_torizon_os/
touch Dockerfile

git clone --depth 1 https://github.com/lvgl/lv_port_linux
git -C lv_port_linux submodule update --init

```

--------------------------------

### lv_arclabel_get_angle_start

Source: https://docs.lvgl.io/9.5/API/widgets/arclabel/lv_arclabel_h.html

Get the start angle of an arc label. This indicates where the arc begins in degrees.

```APIDOC
## lv_arclabel_get_angle_start

### Description
Get the start angle of an arc label.

### Parameters
* **obj** (lv_obj_t *) - pointer to an arc label object

### Returns
lv_value_precise_t - the start angle [0..360] (if `LV_USE_FLOAT` is enabled it can be fractional too.)
```

--------------------------------

### Complete Hardware Button Example

Source: https://docs.lvgl.io/9.5/main-modules/indev/button.html

Sets up an input device for buttons, assigns points, and provides a read callback to handle button presses and releases.

```c
static const lv_point_t points_array[] = {
    {12,30}, /* First button is assigned to x=12; y=30 */
    {60,90}  /* Second button is assigned to x=60; y=90 */
};

lv_indev_t * indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_BUTTON);
lv_indev_set_button_points(indev, points_array);
lv_indev_set_read_cb(indev, button_read);

... 

void button_read(lv_indev_t * indev, lv_indev_data_t * data)
{
    /* Get the ID (0,1,2...) of the pressed button. 
     * Let's say it returns -1 if no button was pressed */
    int btn_pr = my_btn_read();

    /* Is there a button press? */
    if(btn_pr >= 0) {
       data->btn_id = btn_pr;           /* Save the ID of the pressed button */
       data->state = LV_INDEV_STATE_PRESSED;  /* Set the pressed state */
    } else {
       data->state = LV_INDEV_STATE_RELEASED; /* Set the released state */
    }
}

```

--------------------------------

### Create X11 Window and Initialize Inputs

Source: https://docs.lvgl.io/9.5/API/drivers/x11/lv_x11_h.html

Demonstrates the minimal initialization for an X11 display driver with keyboard and mouse support. This includes creating the window and then setting up the input devices.

```c
lv_display_t* disp = lv_x11_window_create("My Window Title", window_width, window_width);
lv_x11_inputs_create(disp, NULL);
```

--------------------------------

### Clone FrogFS Repository

Source: https://docs.lvgl.io/9.5/libs/fs_support/frogfs.html

Clone the upstream frogfs project from GitHub to get started with creating filesystem blobs.

```bash
git clone https://github.com/jkent/frogfs
cd frogfs
```

--------------------------------

### Clone Buildroot Repository

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/quick_setup.html

Clone the LVGL Buildroot repository to get started. Ensure submodules are also cloned recursively.

```bash
git clone --recurse-submodules https://github.com/lvgl/lv_buildroot.git

```

--------------------------------

### Extract and Set Up SDK Environment

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/lvgl_app.html

Extract the generated SDK archive into a desired location and set up the cross-compilation environment by creating and making executable a 'setup-build-env.sh' script.

```bash
mkdir -p ~/sdk
tar -xzf images/aarch64-buildroot-linux-gnu_sdk-buildroot.tar.gz -C ~/sdk
cd ..

mkdir application && cd application
touch setup-build-env.sh && chmod +x setup-build-env.sh
```

--------------------------------

### lv_obj_get_style_length

Source: https://docs.lvgl.io/9.5/API/core/lv_obj_style_gen_h.html

Gets the length style property of a widget. Its meaning is widget-dependent, for example, it can represent the length of ticks in a scale widget.

```APIDOC
## lv_obj_get_style_length

### Description
Its meaning depends on the type of Widget. For example in case of lv_scale it means the length of the ticks.

### Parameters
* **obj** (const lv_obj_t *) - Pointer to Widget
* **part** (lv_part_t) - One of the `LV_PART_...` enum values
```

--------------------------------

### Getting Bar Values

Source: https://docs.lvgl.io/9.5/API/widgets/bar/lv_bar_h.html

Functions to retrieve the current value, start value, minimum value, and maximum value of the bar widget.

```APIDOC
## lv_bar_get_value()

### Description
Gets the current value of the bar.

### Parameters
- **bar**: `lv_obj_t*` - Pointer to the bar widget.

### Returns
- `int32_t`: The current value of the bar.
```

```APIDOC
## lv_bar_get_start_value()

### Description
Gets the start value of the bar.

### Parameters
- **bar**: `lv_obj_t*` - Pointer to the bar widget.

### Returns
- `int32_t`: The start value of the bar.
```

```APIDOC
## lv_bar_get_min_value()

### Description
Gets the minimum value of the bar.

### Parameters
- **bar**: `lv_obj_t*` - Pointer to the bar widget.

### Returns
- `int32_t`: The minimum value of the bar.
```

```APIDOC
## lv_bar_get_max_value()

### Description
Gets the maximum value of the bar.

### Parameters
- **bar**: `lv_obj_t*` - Pointer to the bar widget.

### Returns
- `int32_t`: The maximum value of the bar.
```

--------------------------------

### Initialize LVGL and Load UI

Source: https://docs.lvgl.io/9.5/details/xml/integration/renesas-dev-tools.html

Standard LVGL initialization functions followed by UI initialization and screen loading. Replace 'my_screen' with your actual main screen name.

```c
/* Standard LVGL initialization */
lv_init();
lv_port_disp_init();
lv_port_indev_init();

/* Initialize the UI generated from the LVGL Editor */
ui_init();

/* (replace "my_screen" with the actual name of your main screen) */
lv_obj_t * my_screen = my_screen_create();
lv_screen_load(my_screen);

```

--------------------------------

### Create X11 Window with Mouse Cursor

Source: https://docs.lvgl.io/9.5/API/drivers/x11/lv_x11_h.html

Shows how to create an X11 window and initialize input devices, including setting a custom image for the mouse cursor.

```c
lv_image_dsc_t mouse_symbol = {.....};
lv_display_t* disp = lv_x11_window_create("My Window Title", window_width, window_width);
lv_x11_inputs_create(disp, &mouse_symbol);
```

--------------------------------

### Get Next Line of Text

Source: https://docs.lvgl.io/9.5/API/misc/lv_text_private_h.html

Calculates and returns the starting index of the next line of text, considering line length constraints and breakable characters.

```APIDOC
## lv_text_get_next_line

### Description
Get the next line of text. Check line length and break chars too.

### Parameters
* **txt** (const char *) - a '\0' terminated string
* **len** (uint32_t) - length of 'txt' in bytes
* **font** (const lv_font_t *) - pointer to a font
* **used_width** (int32_t *) - When used_width != NULL, save the width of this line if flag == LV_TEXT_FLAG_NONE, otherwise save -1.
* **attributes** (lv_text_attributes_t *) - text attributes, flags to control line break behaviour, spacing etc.

### Returns
the index of the first char of the new line (in byte index not letter index. With UTF-8 they are different)
```

--------------------------------

### Create LVGL Application Recipe

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/yocto/lvgl_recipe.html

Set up the directory structure and create a .bb file for an LVGL application recipe.

```bash
cd ../sources/meta-mylvgl
mkdir -p recipes-lvglapp/lvgl-fbdev-benchmark/files
touch recipes-lvglapp/lvgl-fbdev-benchmark/lvglbenchmarkfbdev_2.4.bb
```

--------------------------------

### Initialize LVGL

Source: https://docs.lvgl.io/9.5/integration/overview.html

To initialize LVGL, include the main header, initialize your hardware, and then call `lv_init()`.

```c
#include "lvgl/lvgl.h"

// Initialize your hardware (clock, peripherals, etc.)

lv_init();
```

--------------------------------

### Get Two Fingers Swipe Distance

Source: https://docs.lvgl.io/9.5/API/indev/lv_indev_gesture_h.html

Retrieves the distance in pixels from the starting center for a two-finger swipe gesture. This helps quantify the swipe movement.

```c
float lv_event_get_two_fingers_swipe_distance(lv_event_t *gesture_event);
```

--------------------------------

### Set Up Rootfs Overlay Directory

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/lvgl_app.html

Create the necessary directory structure for the rootfs overlay and copy the compiled application executable into the appropriate location within the overlay.

```bash
mkdir -p resources/board/rootfs_overlay/usr/bin
cp application/lv_benchmark/bin/lvgl-app resources/board/rootfs_overlay/usr/bin/
```

--------------------------------

### Get Two Fingers Swipe Direction

Source: https://docs.lvgl.io/9.5/API/indev/lv_indev_gesture_h.html

Determines the direction of a two-finger swipe gesture relative to its starting center. Returns an `lv_dir_t` value indicating the direction.

```c
lv_dir_t lv_event_get_two_fingers_swipe_dir(lv_event_t *gesture_event);
```

--------------------------------

### Basic LVGL Application with SDL

Source: https://docs.lvgl.io/9.5/integration/pc/sdl.html

This is a fundamental example of initializing LVGL and creating an SDL window for display and input. Ensure SDL_MAIN_HANDLED is defined to prevent issues with SDL's main function on Windows.

```c
#define SDL_MAIN_HANDLED        /* To fix SDL's "undefined reference to WinMain" issue */
#include "lvgl/lvgl.h"

static lv_display_t *display;
static lv_indev_t *mouse;
static lv_indev_t *mouse_wheel;
static lv_indev_t *keyboard;

int main()
{
    /* Initialize LVGL */
    lv_init();

    display = lv_sdl_window_create(SDL_HOR_RES, SDL_VER_RES);
    mouse = lv_sdl_mouse_create();
    mouse_wheel = lv_sdl_mousewheel_create();
    keyboard = lv_sdl_keyboard_create();

    /* Create widgets on the screen */
    lv_demo_widgets();

    while (1) {
        lv_timer_handler();
        lv_delay_ms(5);
    }

    return 0;
}
```

--------------------------------

### Set Rotation

Source: https://docs.lvgl.io/9.5/API/widgets/scale/lv_scale_h.html

Sets the angular offset for the scale's starting point. This is particularly useful for round scales to orient them correctly, for example, aligning the zero point to a specific clock position.

```APIDOC
## lv_scale_set_rotation

### Description
Set angular offset from the 3-o'clock position of the low end of the Scale. (Applies only to round Scales.)

### Parameters
#### Scale Object
* **obj** (lv_obj_t *) - pointer to Scale Widget
#### Rotation Angle
* **rotation** (int32_t) - clockwise angular offset (in degrees) from the 3-o'clock position of the low end of the scale; negative and >360 values are first normalized to range [0..360]. Examples:
    * 0 = 3 o'clock (right side)
    * 30 = 4 o'clock
    * 60 = 5 o'clock
    * 90 = 6 o'clock
    * 135 = midway between 7 and 8 o'clock (default)
    * 180 = 9 o'clock
    * 270 = 12 o'clock
    * 300 = 1 o'clock
    * 330 = 2 o'clock
    * -30 = 2 o'clock
    * 390 = 4 o'clock
```

--------------------------------

### Configure Button Size, Alignment, and Label

Source: https://docs.lvgl.io/9.5/getting_started/learn_the_basics.html

This example demonstrates setting a button's size using percentage and content height, aligning it, and setting its label text and color. It also shows how to use non-pixel units for sizing.

```c
lv_obj_t * my_button1 = lv_button_create(lv_screen_active());
/* Set parent-sized width, and content-sized height */
lv_obj_set_size(my_button1, lv_pct(100), LV_SIZE_CONTENT);
/* Align to the right center with 20px offset horizontally */
lv_obj_align(my_button1, LV_ALIGN_RIGHT_MID, -20, 0);

lv_obj_t * my_label1 = lv_label_create(my_button1);
lv_label_set_text_fmt(my_label1, "Click me!");
lv_obj_set_style_text_color(my_label1, lv_color_hex(0xff0000), 0);
/* Make the text red */
```

--------------------------------

### Configure LVGL Encoder Input Device Group

Source: https://docs.lvgl.io/9.5/details/integration/os/zephyr.html

Example C code to get the LVGL encoder input device and assign an LVGL group to it. This requires the encoder input device to be available in the devicetree.

```c
const struct device *lvgl_encoder = DEVICE_DT_GET(DT_COMPAT_GET_ANY_STATUS_OKAY(zephyr_lvgl_encoder_input));

lv_obj_t *arc;
lv_group_t *arc_group;

arc = lv_arc_create(lv_screen_active());
lv_obj_align(arc, LV_ALIGN_CENTER, 0, 0);
lv_obj_set_size(arc, 150, 150);

arc_group = lv_group_create();
lv_group_add_obj(arc_group, arc);
lv_indev_set_group(lvgl_input_get_indev(lvgl_encoder), arc_group);


```

--------------------------------

### Basic DRM Display Initialization and Demo

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/drivers/drm.html

Initialize LVGL, create a DRM display, set the device, and run the widget demo. This snippet shows the fundamental steps for using the DRM driver.

```c
#include "lvgl/lvgl.h"
#include "lvgl/demos/lv_demos.h"

int main(void)
{
    /* Initialize LVGL */
    lv_init();

    /* DRM device node */
    const char *device = "/dev/dri/card0";

    /* Create a DRM display */
    lv_display_t *disp = lv_linux_drm_create();

    /* Set DRM device file and connector */
    /* The 2nd argument is the DRM device path */
    /* The 3rd argument is the connector_id (-1 = auto-select first available) */
    lv_linux_drm_set_file(disp, device, -1);

    /* Create demo widgets */
    lv_demo_widgets();

    /* Handle LVGL tasks */
    while (1) {
        uint32_t time_until_next = lv_timer_handler();
        if(time_until_next == LV_NO_TIMER_READY) {
            time_until_next = LV_DEF_REFR_PERIOD;
        }
        lv_delay_ms(time_until_next);
    }

    return 0;
}

```

--------------------------------

### XML Example for Screen Load and Create Events

Source: https://docs.lvgl.io/9.5/xml/ui_elements/events.html

Defines two screens with buttons that trigger screen creation and loading. Use `<screen_create_event>` to dynamically create a screen and `<screen_load_event>` to load an existing one.

```xml
<!-- screen1.xml -->
<screen>
   <view style_bg_color="0xff7788">
       <lv_button>
           <lv_label text="Create"/>
           <!-- Create an instance of "screen2" and load it. -->
           <screen_create_event screen="screen2" anim_type="over_right" duration="500" delay="1000"/>
       </lv_button>
   </view>
</screen>

<!-- screen2.xml -->
<screen>
   <view style_bg_color="0x77ff88">
       <lv_button>
           <lv_label text="Load"/>
           <!-- Load an already created instance of screen1.-->
           <screen_load_event screen="screen1"/>
       </lv_button>
   </view>
</screen>
```

--------------------------------

### Basic CMake Build (Method 1)

Source: https://docs.lvgl.io/9.5/integration/building/cmake.html

Use this method for a straightforward configuration and build process from the command line. Ensure you are in the LVGL repository root.

```bash
cd <lvgl_repo>
mkdir build
cd build
cmake ..            # Configure phase
cmake --build .     # Build phase
```

--------------------------------

### Build with CMake Presets

Source: https://docs.lvgl.io/9.5/integration/building/cmake.html

Leverage CMake presets for predefined configurations and build types. This example shows how to activate a Windows base configuration and then build a debug version.

```bash
cmake --preset windows-base
cmake --build --preset windows-base_dbg
ctest --preset windows-base_dbg
```

--------------------------------

### Basic OpenGL Driver Usage

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/drivers/opengl_driver.html

Demonstrates the basic setup and usage of the OpenGL driver, including creating a display that flushes to an OpenGL texture and integrating with the LVGL main loop. Ensure an OpenGL context is created before initializing LVGL.

```c
#include "lvgl/lvgl.h"

#define WIDTH 640
#define HEIGHT 480

/* This flush callback works with both FULL and DIRECT render modes*/
static void flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map)
{
    if (lv_display_flush_is_last(disp)) {
        const int32_t disp_width = lv_display_get_horizontal_resolution(disp);
        const int32_t disp_height = lv_display_get_vertical_resolution(disp);
        /* The texture occupies the full screen even if `area` is not the full screen which happens with RENDER_MODE_DIRECT */
        lv_area_t full_area;
        lv_area_set(&full_area, 0, 0, disp_width, disp_height);

        /* Get the texture id containing LVGL generated UI */
        unsigned int texture_id = lv_opengles_texture_get_texture_id(disp);
        /* This function will render to the current context */
        lv_opengles_render_texture(texture_id, &full_area, LV_OPA_COVER, disp_width, disp_height, &full_area, false, true);
    }
    lv_display_flush_ready(disp);
}

int main()
{
    /* initialize lvgl */
    lv_init();
    /* Don't forget the tick callback */

    /* NOTE: OpenGL context must be created before this point */

    /* Create a display that flushes to a texture. The OpenGL texture will be created for you */
    lv_display_t * texture = lv_opengles_texture_create(WIDTH, HEIGHT);
    /* If you already have an OpenGL texture ready, you can use it instead:
     * lv_display_t * texture = lv_opengles_texture_create_from_texture_id(WIDTH, HEIGHT, my_texture_id); */

    /* Set the display render mode and flush callback
     * lv_display_set_render_mode(texture, LV_DISPLAY_RENDER_MODE_FULL);
     * lv_display_set_flush_cb(texture, flush_cb); */

    /* get the texture ID for use in your application */
    unsigned int texture_id = lv_opengles_texture_get_texture_id(texture);

    /* create Widgets on the screen */
    lv_demo_widgets();

    while (1)
    {
        uint32_t time_until_next = lv_timer_handler();
        if(time_until_next == LV_NO_TIMER_READY) time_until_next = LV_DEF_REFR_PERIOD;
        lv_delay_ms(time_until_next);
    }

    return 0;
}

```

--------------------------------

### Install Podman on MacOS

Source: https://docs.lvgl.io/9.5/xml/editor/install.html

Install Podman on MacOS using the Homebrew package manager.

```bash
brew install podman
```

--------------------------------

### Build All LVGL Libraries for QNX

Source: https://docs.lvgl.io/9.5/integration/rtos/qnx.html

Navigate to the QNX support directory and run 'make' to build all shared and static libraries for supported architectures.

```bash
# cd $(LVGL_ROOT)/env_support/qnx
# make
```

--------------------------------

### Install Podman on Fedora

Source: https://docs.lvgl.io/9.5/xml/editor/install.html

Install Podman on Fedora systems using the DNF package manager.

```bash
sudo dnf -y install podman
```

--------------------------------

### Install Application Binary

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/quick_setup.html

Copy the compiled application binary into the root filesystem overlay to include it in the final image.

```bash
cp application/lv_benchmark/bin/lvgl-app resources/board/rootfs_overlay/usr/bin/

```

--------------------------------

### Install Wayland Dependencies on Fedora

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/drivers/wayland.html

Installs necessary development libraries for Wayland integration on Fedora systems.

```bash
sudo dnf install wayland-devel libxkbcommon-devel wayland-utils wayland-protocols-devel

```

--------------------------------

### Initialize LVGL and Display Driver in main.cpp

Source: https://docs.lvgl.io/9.5/integration/framework/platformio.html

Initialize LVGL, set the tick callback, and create a display driver instance. This example uses `millis()` for ticks and `lv_lovyan_gfx_create` for display initialization.

```cpp
#include <Arduino.h>
#include <lvgl.h>

#define BUF_SIZE 320 * 50
uint8_t lv_buffer[BUF_SIZE];

/* Tick source, tell LVGL how much time (milliseconds) has passed */
static uint32_t my_tick(void)
{
    return millis();
}

void setup() {

    /* Initialize LVGL */
    lv_init();
    /* Set the tick callback */
    lv_tick_set_cb(my_tick);
    /* Initialize the display driver */
    lv_lovyan_gfx_create(320, 480, lv_buffer, BUF_SIZE, true);

    lv_obj_t *label = lv_label_create(lv_screen_active());
    lv_label_set_text(label, "Hello PlatformIO, I\'m LVGL!");
    lv_obj_align(label, LV_ALIGN_CENTER, 0, 0 );

}

void loop() {
    lv_timer_handler(); // Update the UI-
    delay(5);
}

```

--------------------------------

### Install Wayland Dependencies on Ubuntu

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/drivers/wayland.html

Installs necessary development libraries for Wayland integration on Ubuntu systems.

```bash
sudo apt-get install libwayland-dev libxkbcommon-dev libwayland-bin wayland-protocols

```

--------------------------------

### Simple Grid Example

Source: https://docs.lvgl.io/9.5/details/common-widget-features/layouts/grid.html

Demonstrates how to create a basic grid layout with predefined column and row sizes. Child widgets are automatically arranged and stretched to fill their cells.

```c
#include "../../lv_examples.h"
#if LV_USE_GRID && LV_BUILD_EXAMPLES

/**
 * A simple grid
 */
void lv_example_grid_1(void)
{
    static int32_t col_dsc[] = {70, 70, 70, LV_GRID_TEMPLATE_LAST};
    static int32_t row_dsc[] = {50, 50, 50, LV_GRID_TEMPLATE_LAST};

    /*Create a container with grid*/
    lv_obj_t * cont = lv_obj_create(lv_screen_active());
    lv_obj_set_style_grid_column_dsc_array(cont, col_dsc, 0);
    lv_obj_set_style_grid_row_dsc_array(cont, row_dsc, 0);
    lv_obj_set_size(cont, 300, 220);
    lv_obj_center(cont);
    lv_obj_set_layout(cont, LV_LAYOUT_GRID);

    lv_obj_t * label;
    lv_obj_t * obj;

    uint8_t i;
    for(i = 0; i < 9; i++) {
        uint8_t col = i % 3;
        uint8_t row = i / 3;

        obj = lv_button_create(cont);
        /*Stretch the cell horizontally and vertically too
         *Set span to 1 to make the cell 1 column/row sized*/
        lv_obj_set_grid_cell(obj, LV_GRID_ALIGN_STRETCH, col, 1, 
                             LV_GRID_ALIGN_STRETCH, row, 1);

        label = lv_label_create(obj);
        lv_label_set_text_fmt(label, "c%d, r%d", col, row);
        lv_obj_center(label);
    }
}

#endif

```

--------------------------------

### Start Animation

Source: https://docs.lvgl.io/9.5/API/widgets/animimage/lv_animimage_h.html

Starts the playback of the animated image. The animation will begin playing according to its configured settings.

```APIDOC
## lv_animimg_start

### Description
Starts the playback of the animated image. The animation will begin playing according to its configured settings.

### Function Signature
```c
void lv_animimg_start(lv_obj_t *obj);
```

### Parameters
*   **obj** (*lv_obj_t* *) - Pointer to the animated image object.
```

--------------------------------

### Step-by-Step Test Execution Initialization

Source: https://docs.lvgl.io/9.5/xml/features/tests.html

Prepares for executing test steps one by one. It cleans the screen and sets up the view to be tested.

```c
lv_xml_test_run_init()
```

--------------------------------

### Configure and Start DMA2D Transfer

Source: https://docs.lvgl.io/9.5/API/draw/dma2d/lv_draw_dma2d_private_h.html

Configures the DMA2D peripheral with the provided settings and starts a transfer operation.

```APIDOC
## void lv_draw_dma2d_configure_and_start_transfer

### Description
Configures the DMA2D peripheral with the provided settings and starts a transfer operation.

### Signature
void lv_draw_dma2d_configure_and_start_transfer(const lv_draw_dma2d_configuration_t *conf)

### Parameters
* **conf** (*const lv_draw_dma2d_configuration_t ") - Pointer to the DMA2D configuration structure.
```

--------------------------------

### State and Volume

Source: https://docs.lvgl.io/9.5/API/libs/gstreamer/lv_gstreamer_h.html

Functions to get the current state of the GStreamer object and to set and get the audio volume.

```APIDOC
## lv_gstreamer_get_state

### Description
Get the state of this gstreamer.

### Parameters
* **gstreamer** (*lv_obj_t* *) - Pointer to a gstreamer object.

### Returns
* (*lv_gstreamer_state_t*) - The current state of the gstreamer object.

## lv_gstreamer_set_volume

### Description
Set the volume of this gstreamer.

### Parameters
* **gstreamer** (*lv_obj_t* *) - Pointer to a gstreamer object.
* **volume** (*uint8_t*) - The value to set in the range [0..100]. Higher values are clamped.

## lv_gstreamer_get_volume

### Description
Get the volume of this gstreamer.

### Parameters
* **gstreamer** (*lv_obj_t* *) - Pointer to a gstreamer object.

### Returns
* (*uint8_t*) - The current volume for this gstreamer.
```

--------------------------------

### Apply Rootfs Overlay and Verify

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/lvgl_app.html

After configuring the rootfs overlay, run 'make' to apply the changes. Verify that the application executable is present in the Buildroot output directory.

```bash
find . -name lvgl-app
```

--------------------------------

### Enter Buildroot Output Directory

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/image_generation.html

Navigates into the output directory where Buildroot commands will be executed.

```bash
cd output
```

--------------------------------

### Install Podman on Arch/Manjaro Linux

Source: https://docs.lvgl.io/9.5/xml/editor/install.html

Install Podman on Arch Linux and its derivatives using the Pacman package manager.

```bash
sudo pacman -S podman
```

--------------------------------

### Check WSL Installation (Windows)

Source: https://docs.lvgl.io/9.5/xml/editor/install.html

Verify if WSL is already installed on your Windows system by listing verbose details.

```bash
wsl.exe --list --verbose
```

--------------------------------

### Create NuttX Workspace

Source: https://docs.lvgl.io/9.5/details/integration/os/nuttx.html

Sets up a directory structure for NuttX development and navigates into it.

```bash
mkdir ~/nuttxspace
cd ~/nuttxspace

```

--------------------------------

### Set Start Value

Source: https://docs.lvgl.io/9.5/API/widgets/bar/lv_bar_h.html

Sets a new start value for the bar. The animation parameter determines if the change should be animated.

```APIDOC
## lv_bar_set_start_value

### Description
Set a new start value on the bar.

### Parameters
* **obj** (lv_obj_t *) - pointer to a bar object
* **start_value** (int32_t) - new start value
* **anim** (lv_anim_enable_t) - LV_ANIM_ON: set the value with an animation; LV_ANIM_OFF: change the value immediately
```

--------------------------------

### Setup Keypad Input Device and Group

Source: https://docs.lvgl.io/9.5/main-modules/indev/keypad.html

This snippet demonstrates how to create a group for focus management and set up a keypad input device with a custom read callback. Ensure widgets are added to a group to be selectable.

```c
/*Create a group and add widgets to it so they can be selected by the keypad*/
lv_group_t * g = lv_group_create();

lv_indev_t * indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_KEYPAD);
lv_indev_set_read_cb(indev, keyboard_read);
lv_indev_set_group(indev, g);

...

void keyboard_read(lv_indev_t * indev, lv_indev_data_t * data) {
  if(key_pressed()) {
     data->key = my_last_key();            /* Get the last pressed or released key */
     data->state = LV_INDEV_STATE_PRESSED;
  } else {
     data->state = LV_INDEV_STATE_RELEASED;
  }
}
```

--------------------------------

### Display BitBake Help Options

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/yocto/core_components.html

Use these commands to view the available command-line options for BitBake.

```bash
$ bitbake -h
$ bitbake --help

```

--------------------------------

### Example Commit Message: Documentation Fix

Source: https://docs.lvgl.io/9.5/contributing/pull_requests.html

Example commit message for a documentation fix, specifying the type and scope.

```text
docs(porting): fix typo


```

--------------------------------

### Verify libdrm Installation

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/lvgl_app.html

After building the environment, verify that the libdrm library has been installed by searching for its files within the target sysroot.

```bash
find build/ -name "*libdrm*"
```

--------------------------------

### Example Arduino Project Structure

Source: https://docs.lvgl.io/9.5/xml/integration/arduino.html

Illustrates the recommended folder structure for an LVGL Editor project within an Arduino sketch, ensuring all files are compiled.

```text
YourSketch/
├── YourSketch.ino
└── src/
      └── editor_project/
          ├── editor_project.h
          ├── editor_project.c
          ├── screens/
          ├── widgets/
          └── components/

```

--------------------------------

### Configure Buildroot with Menuconfig

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/buildroot/image_generation.html

Launches the menuconfig interface to customize Buildroot settings.

```bash
make menuconfig
```

--------------------------------

### Set Start Callback

Source: https://docs.lvgl.io/9.5/API/widgets/animimage/lv_animimage_h.html

Sets a callback function that will be called when the animation image actually starts playing (after any initial delay).

```APIDOC
## lv_animimg_set_start_cb

### Description
Sets a callback function that will be called when the animation image actually starts playing (after any initial delay).

### Function Signature
```c
void lv_animimg_set_start_cb(lv_obj_t *obj, lv_anim_start_cb_t start_cb);
```

### Parameters
*   **obj** (*lv_obj_t* *) - Pointer to the animated image object.
*   **start_cb** (*lv_anim_start_cb_t*) - The callback function to be called when the animation starts.
```

--------------------------------

### Set Start Angle

Source: https://docs.lvgl.io/9.5/API/widgets/arc/lv_arc_h.html

Sets the start angle of the arc. Angles are measured in degrees, with 0 degrees pointing to the right.

```APIDOC
## lv_arc_set_start_angle

### Description
Sets the start angle of an arc. 0 deg: right, 90 bottom, etc.

### Function Signature
```c
void lv_arc_set_start_angle(lv_obj_t *obj, lv_value_precise_t start)
```

### Parameters
* **obj** (*lv_obj_t* *) - Pointer to an arc object.
* **start** (*lv_value_precise_t*) - The start angle. (if `LV_USE_FLOAT` is enabled it can be fractional too.)
```

--------------------------------

### Run NuttX Simulator

Source: https://docs.lvgl.io/9.5/details/integration/os/nuttx.html

Starts the NuttX simulator on the PC.

```bash
./nuttx

```

--------------------------------

### Install libdrm-dev on Debian/Ubuntu

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/drivers/drm.html

Install the necessary development library for DRM on Debian or Ubuntu-based systems. This is a prerequisite for using the DRM driver.

```bash
sudo apt-get install libdrm-dev

```

--------------------------------

### Initialize Yocto Build Environment

Source: https://docs.lvgl.io/9.5/integration/embedded_linux/os/yocto/lvgl_recipe.html

Navigate to the project root and source the Yocto environment setup script. This prepares the build environment and sets the current directory to the build folder.

```bash
cd ../ # go back to the root folder
source sources/poky/oe-init-build-env

```

--------------------------------

### Install pre-commit Hooks

Source: https://docs.lvgl.io/9.5/contributing/coding_style.html

Installs the git hook scripts managed by pre-commit. This ensures hooks run automatically on git commit.

```bash
pre-commit install

```
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