### Run Eww Daemon and Open Widget

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Start the Eww daemon and then open a widget by its name. Ensure the Eww binary is in your PATH or run from its directory.

```bash
./eww daemon
./eww open <window_name>
```

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

### Build Eww for X11

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Build the Eww project in release mode with X11 features enabled. Ensure you have the necessary prerequisites installed.

```bash
cargo build --release --no-default-features --features x11
```

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

### Start Eww Daemon

Source: https://context7.com/elkowar/eww/llms.txt

Launches the Eww daemon process. Options include enabling debug logging or specifying a custom configuration directory.

```bash
# Start the daemon
ewww daemon

# Start with debug logging
ewww --debug daemon

# Start with custom config directory
ewww --config /path/to/config daemon
```

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

### Complete Status Bar Example

Source: https://context7.com/elkowar/eww/llms.txt

A full status bar configuration demonstrating various Eww concepts like variables, polling, listening, custom widgets, and window definitions. Requires Eww and potentially `wmctrl` and `playerctl`.

```lisp
; eww.yuck - Complete bar example

; Variables
(defvar volume 50)
(defvar show_calendar false)

; Polling variables
(defpoll time :interval "1s"
  "date '+%H:%M'")

(defpoll date :interval "60s"
  "date '+%b %d, %Y'")

; Listening variable for music
(deflisten music :initial ""
  "playerctl --follow metadata --format '{{artist}} - {{title}}' || true")

; Custom widgets
(defwidget workspaces []
  (box :class "workspaces"
       :orientation "h"
       :spacing 5
    (for i in `[1,2,3,4,5,6,7,8,9]`
      (button :class "workspace"
              :onclick "wmctrl -s ${i - 1}"
        i))))

(defwidget music-widget []
  (box :class "music"
       :visible {music != ""}
    (label :text {music}
           :limit-width 40
           :truncate true)))

(defwidget volume-slider []
  (box :class "volume"
       :orientation "h"
       :space-evenly false
       :spacing 5
    (label :text "")
    (scale :min 0
           :max 100
           :value volume
           :onchange "pamixer --set-volume {}")))

(defwidget system-info []
  (box :class "system-info"
       :orientation "h"
       :space-evenly false
       :spacing 15
    (label :text "CPU: ${round(EWW_CPU.avg, 0)}%")
    (label :text "RAM: ${round(EWW_RAM.used_mem_perc, 0)}%")
    (label :text "DISK: ${round(EWW_DISK['/'].used_perc, 0)}%")))

(defwidget clock []
  (eventbox :onclick "eww update show_calendar=${!show_calendar}"
    (box :class "clock"
         :orientation "h"
         :space-evenly false
         :spacing 10
      (label :text time)
      (label :text date))))

(defwidget bar-layout []
  (centerbox :orientation "h"
    (box :halign "start"
      (workspaces))
    (box :halign "center"
      (music-widget))
    (box :halign "end"
         :space-evenly false
         :spacing 20
      (system-info)
      (volume-slider)
      (clock))))

; Window definition
(defwindow bar
  :monitor 0
  :windowtype "dock"
  :geometry (geometry :x "0%"
                      :y "5px"
                      :width "98%"
                      :height "35px"
                      :anchor "top center")
  :reserve (struts :side "top" :distance "45px")
  :stacking "fg"
  :exclusive true
  (bar-layout))

; Calendar popup
(defwindow calendar-popup
  :monitor 0
  :geometry (geometry :x "0px"
                      :y "50px"
                      :anchor "top right")
  :stacking "fg"
  (calendar :show-heading true
            :show-day-names true))
```

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

### Organizing Eww Configuration with Includes

Source: https://context7.com/elkowar/eww/llms.txt

Demonstrates how to split a large Eww configuration into multiple files using the `include` directive for better organization. This approach helps manage complex setups by separating different components like widgets, variables, and windows.

```lisp
; eww.yuck - main entry point
(include "./widgets/bar.yuck")
(include "./widgets/dashboard.yuck")
(include "./variables.yuck")
(include "./windows.yuck")

; Or use separate config directories
; eww --config ~/.config/eww-bar open bar
; eww --config ~/.config/eww-dashboard open dashboard
```

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

### Define a Basic Eww Window

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use `defwindow` to declare a window with properties like monitor, geometry, and content. This is the starting point for creating any visible element in Eww.

```lisp
(defwindow example
           :monitor 0
           :geometry (geometry :x "0%"
                               :y "20px"
                               :width "90%"
                               :height "30px"
                               :anchor "top center")
           :stacking "fg"
           :reserve (struts :distance "40px" :side "top")
           :windowtype "dock"
           :wm-ignore false
  "example content")
```

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

### Build Eww for Wayland

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Build the Eww project in release mode with Wayland features enabled. This is for Wayland environments. Ensure you have the necessary prerequisites installed.

```bash
cargo build --release --no-default-features --features=wayland
```

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

### Basic GTK CSS Stylesheet

Source: https://context7.com/elkowar/eww/llms.txt

An example SCSS stylesheet for Eww, demonstrating how to reset all styles, style the main window, apply class-based styling, and customize individual widget appearances like buttons, scales, progress bars, and labels. Includes hover and active states.

```scss
// Reset all styles
* {
  all: unset;
}

// Window styling
window {
  background-color: rgba(30, 30, 46, 0.9);
}

// Class-based styling
.bar {
  background-color: #1e1e2e;
  color: #cdd6f4;
  padding: 10px;
  border-radius: 10px;
}

// Widget-specific styling
button {
  background-color: #313244;
  padding: 5px 10px;
  border-radius: 5px;

  &:hover {
    background-color: #45475a;
  }

  &:active {
    background-color: #585b70;
  }
}

// Scale/slider styling
scale {
  trough {
    background-color: #313244;
    border-radius: 5px;
    min-height: 8px;
    min-width: 100px;
  }

  highlight {
    background-color: #89b4fa;
    border-radius: 5px;
  }

  slider {
    background-color: #cdd6f4;
    border-radius: 50%;
    min-width: 12px;
    min-height: 12px;
  }
}

// Progress bar styling
progressbar {
  trough {
    background-color: #313244;
    border-radius: 5px;
    min-height: 10px;
  }

  progress {
    background-color: #a6e3a1;
    border-radius: 5px;
  }
}

// Circular progress styling
circular-progress {
  background-color: #313244;
  color: #89b4fa;       // progress color
  padding: 2px;
}

// Label styling
label {
  color: #cdd6f4;
  font-family: "JetBrains Mono";
  font-size: 14px;
}

// Eventbox with CSS states
eventbox {
  &:hover {
    background-color: rgba(255, 255, 255, 0.1);
  }

  &:active {
    background-color: rgba(255, 255, 255, 0.2);
  }
}
```

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

### Display Widgets in Lisp

Source: https://context7.com/elkowar/eww/llms.txt

Examples of using Lisp to define various display widgets like labels, images, progress bars, and graphs. Includes configuration for text formatting, image sources, and progress visualization.

```lisp
(label :text "Hello World"
       :markup "<b>Bold</b> and <i>italic</i>"
       :wrap true
       :truncate true
       :limit-width 20
       :show-truncated true
       :angle 0
       :xalign 0.5
       :yalign 0.5
       :justify "left")
```

```lisp
(image :path "/path/to/image.png"
       :image-width 100
       :image-height 100
       :preserve-aspect-ratio true)
```

```lisp
(image :icon "firefox"
       :icon-size "dialog")  ; menu, small-toolbar, large-toolbar, button, dnd, dialog
```

```lisp
(image :path "/path/to/icon.svg"
       :fill-svg "#ff5500"
       :image-width 24
       :image-height 24)
```

```lisp
(progress :value {battery_percent}
          :orientation "horizontal"
          :flipped false)
```

```lisp
(circular-progress :value {cpu_usage}
                   :thickness 4
                   :start-at 75
                   :clockwise true)
```

```lisp
(graph :value {cpu_usage}
       :thickness 2
       :time-range "60s"
       :min 0
       :max 100
       :dynamic false
       :line-style "round"
       :flip-x false
       :flip-y false)
```

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

### Define a Reusable Widget with Parameters

Source: https://context7.com/elkowar/eww/llms.txt

Use `defwidget` to create custom, reusable UI components. This example shows a widget with required and optional parameters.

```lisp
; Widget with required and optional parameters
(defwidget greeter [name ?text]
  (box :orientation "horizontal"
       :halign "center"
    text
    (button :onclick "notify-send 'Hello' 'Hello, ${name}'"
      "Greet")))
```

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

### JSON Access Example

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Demonstrates accessing fields within a JSON structure stored in a variable. Supports dot notation, bracket notation with string keys, and bracket notation with numeric indices.

```lisp
json_variable.field_name
```

```lisp
json_variable["field_name"]
```

```lisp
json_variable[12]
```

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

### Dynamic Content Generation with Loops in Lisp

Source: https://context7.com/elkowar/eww/llms.txt

Shows how to generate widgets dynamically from JSON arrays using Lisp's 'for' loop. Examples include creating buttons based on workspace data and labels from a simple item list. Uses conditional classes and onclick events.

```lisp
(defvar workspaces `[
  {"id": 1, "name": "main", "active": true},
  {"id": 2, "name": "web", "active": false},
  {"id": 3, "name": "code", "active": false}
]`)

(box :orientation "horizontal"
  (for ws in workspaces
    (button :class {ws.active ? "active" : ""}
            :onclick "wmctrl -s ${ws.id - 1}"
      {ws.name})))

; Simple array iteration
(defvar items `["Item 1", "Item 2", "Item 3"]`)
(box
  (for item in items
    (label :text item)))
```

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

### Display CPU Temperature using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Use the `EWW_TEMPS` magic variable to display CPU temperature. This example accesses the temperature for 'CPU'.

```lisp
; Temperature information (updates every 2s)
; EWW_TEMPS = {"CPU": 45.0, "GPU": 50.0, ...}
(label :text "Temp: ${EWW_TEMPS.CPU}C")
```

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

### Display Battery Status using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Use the `EWW_BATTERY` magic variable to show the battery capacity. This example accesses the status for 'BAT0'.

```lisp
; Battery information (updates every 2s)
; EWW_BATTERY = {"BAT0": {"capacity": 85, "status": "Charging"}, "total_avg": 85}
(label :text "Battery: ${EWW_BATTERY.BAT0.capacity}%")
```

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

### Conditional Expression

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Example of a conditional expression (ternary operator). It evaluates a condition and returns one of two values based on the boolean result.

```lisp
condition ? 'value' : 'other value'
```

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

### Build Eww from Source

Source: https://context7.com/elkowar/eww/llms.txt

Build Eww for X11 or Wayland display servers from source using Cargo. Ensure the executable is made and then run the daemon.

```bash
# Clone the repository
git clone https://github.com/elkowar/eww
cd eww

# Build for X11
cargo build --release --no-default-features --features x11

# Build for Wayland
cargo build --release --no-default-features --features wayland

# Make executable and run
chmod +x ./target/release/eww
./target/release/eww daemon
```

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

### Use a Custom Greeter Widget in a Window

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Demonstrates how to instantiate the custom 'greeter' widget within a window definition, providing the necessary 'name' attribute and an optional 'text' attribute.

```lisp
(defwindow example
           ; ... values omitted
  (greeter :text "Say hello!"
           :name "Tim"))
```

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

### Navigate to Build Directory

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Change the current directory to the release build output directory.

```bash
cd target/release
```

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

### Navigate to Eww Directory

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Change the current directory to the cloned Eww repository.

```bash
cd eww
```

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

### Use a Widget with Parameters

Source: https://context7.com/elkowar/eww/llms.txt

Instantiate a previously defined widget by providing its required and optional parameters.

```lisp
; Using the widget
(greeter :text "Say hello!" :name "Tim")
```

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

### Make Eww Executable

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Grant execute permissions to the Eww binary.

```bash
chmod +x ./eww
```

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

### Define a Listening Variable for Workspace Changes

Source: https://context7.com/elkowar/eww/llms.txt

Use `deflisten` to track changes in system workspaces by running a custom script.

```lisp
; Monitor workspaces
(deflisten workspaces :initial "[]"
  "~/.config/eww/scripts/get-workspaces")
```

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

### Define a Custom Greeter Widget

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Creates a reusable 'greeter' widget that accepts optional text and a required name. It uses a box to contain text and a button, demonstrating string interpolation for dynamic button text.

```lisp
(defwidget greeter [?text name]
  (box :orientation "horizontal"
       :halign "center"
    text
    (button :onclick "notify-send 'Hello' 'Hello, ${name}'"
      "Greet")))
```

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

### Include External Configuration Files

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use the `include` directive to import the contents of other Eww configuration files into the current file, helping to organize larger projects.

```lisp
(include "./path/to/your/file.yuck")
```

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

### Define a Listening Variable with deflisten

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use `deflisten` to run a script once and continuously read its output line by line. Ideal for real-time updates from processes that emit data, such as log files or status monitors. This is an efficient method when applicable.

```lisp
(deflisten foo :initial "whatever"
  `tail -F /tmp/some_file`)
```

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

### Window Definition with Arguments (Yuck)

Source: https://context7.com/elkowar/eww/llms.txt

Defines a window that accepts arguments, allowing dynamic geometry based on input. It also passes arguments to child widgets.

```lisp
; Window with arguments
(defwindow my_bar [arg1 ?arg2]
  :monitor 0
  :geometry (geometry :x "0%"
                      :y "6px"
                      :width "100%"
                      :height { arg1 == "small" ? "30px" : "40px" }
                      :anchor "top center")
  :stacking "bg"
  :windowtype "dock"
  :reserve (struts :distance "50px" :side "top")
  (my_widget :arg2 arg2))
```

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

### Open Eww Windows

Source: https://context7.com/elkowar/eww/llms.txt

Opens widget windows defined in your configuration. Supports specifying monitor, custom ID, position, size, and toggling.

```bash
# Open a window by name
ewww open my_bar

# Open with specific monitor
ewww open my_bar --screen 0

# Open with custom ID (allows multiple instances)
ewww open my_bar --screen 0 --id primary
ewww open my_bar --screen 1 --id secondary

# Open with position and size overrides
ewww open my_window --pos 100x50 --size 800x600 --anchor "top left"

# Toggle window (open if closed, close if open)
ewww open my_bar --toggle

# Auto-close after duration
ewww open notification --duration 5s

# Open with window arguments
ewww open my_bar --id primary --arg arg1=some_value --arg arg2=another_value

# Open multiple windows at once
ewww open-many my_bar:primary my_bar:secondary --arg primary:screen=0 --arg secondary:screen=1
```

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

### Manage Eww Windows

Source: https://context7.com/elkowar/eww/llms.txt

Commands for managing open widget windows, including closing specific or all windows, listing definitions, and reloading configuration.

```bash
# Close specific windows
ewww close my_bar my_dashboard

# Close all windows
ewww close-all

# List available window definitions
ewww list-windows

# List currently active windows with IDs
ewww active-windows

# Reload configuration
ewww reload

# Kill the daemon
ewww kill
```

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

### Wayland-Specific Window Options (Yuck)

Source: https://context7.com/elkowar/eww/llms.txt

Defines a window with Wayland-specific options such as stacking type, exclusivity, focus behavior, and namespace.

```lisp
; Wayland-specific options
(defwindow wayland_bar
  :monitor 0
  :geometry (geometry :anchor "top center" :width "100%" :height "30px")
  :stacking "overlay"       ; fg, bg, overlay, bottom
  :exclusive true           ; reserve space automatically
  :focusable "ondemand"     ; none, exclusive, ondemand
  :namespace "eww-bar"
  (bar_content))
```

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

### Define a Listening Variable for File Changes

Source: https://context7.com/elkowar/eww/llms.txt

Use `deflisten` to continuously monitor the output of a script, such as `tail -F` for file changes. An `:initial` value is provided for the first render.

```lisp
; Listen to file changes
(deflisten foo :initial "whatever"
  `tail -F /tmp/some_file`)
```

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

### Basic Window Definition (Yuck)

Source: https://context7.com/elkowar/eww/llms.txt

Defines a top-level window with basic geometry, stacking, and window type. Content is provided as a string.

```lisp
; Basic window definition
(defwindow example
  :monitor 0
  :geometry (geometry :x "0%"
                      :y "20px"
                      :width "90%"
                      :height "30px"
                      :anchor "top center")
  :stacking "fg"
  :reserve (struts :distance "40px" :side "top")
  :windowtype "dock"
  :wm-ignore false
  "example content")
```

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

### Define a Listening Variable for Focused Window

Source: https://context7.com/elkowar/eww/llms.txt

Monitor the currently focused window using `deflisten` and `xprop`. This can be used to trigger UI changes based on window focus.

```lisp
; Monitor focused window
(deflisten focused :initial ""
  `xprop -spy -root _NET_CURRENT_DESKTOP`)
```

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

### Use a Labeled Container with Child Widgets

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Shows how to use the 'labeled-container' widget and pass a button as its child. The button's 'onclick' event is defined.

```lisp
(labeled-container :name "foo"
  (button :onclick "notify-send hey ho"
    "click me"))
```

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

### Open Window with Specific Arguments

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Pass values to window arguments using the `--arg` option with the `open` command. Arguments are specified as `name=value`.

```bash
eww open my_bar --id primary --arg arg1=some_value --arg arg2=another_value
```

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

### Open Multiple Windows with Specific IDs

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use `--id` with the `open` command to assign unique identifiers to multiple instances of the same window configuration, allowing for distinct management.

```bash
eww open my_bar --screen 0 --id primary
eww open my_bar --screen 1 --id secondary
```

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

### Clone Eww Repository

Source: https://github.com/elkowar/eww/blob/master/docs/src/eww.md

Clone the Eww project repository from GitHub to your local machine.

```bash
git clone https://github.com/elkowar/eww
```

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

### Define a Listening Variable for Media Player Status

Source: https://context7.com/elkowar/eww/llms.txt

Monitor the status of a media player using `deflisten` and a command like `playerctl`. The `|| true` ensures the command doesn't fail if no player is running.

```lisp
; Monitor media player
(deflisten music :initial ""
  "playerctl --follow metadata --format '{{ artist }} - {{ title }}' || true")
```

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

### Open Many Windows with IDs

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

When using `open-many`, specify IDs by appending them to the configuration name with a colon (e.g., `config_name:id`). If no ID is given, it defaults to the configuration name.

```bash
eww open-many my_config:primary my_config:secondary
```

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

### Apply Global Arguments with Open-Many

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Arguments without a preceding ID in `open-many` are applied to all specified windows. This is useful for setting a uniform configuration across multiple instances.

```bash
eww open-many my_bar:primary my_bar:secondary --arg gui_size="small"
```

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

### Special Widgets in Lisp

Source: https://context7.com/elkowar/eww/llms.txt

Demonstrates advanced Lisp widgets for rendering dynamic content, animated show/hide effects, collapsible sections, transformations, tooltips, and system tray integration. Requires specific configurations for transitions and content.

```lisp
(defvar widget_content "(button 'Dynamic')")
(literal :content widget_content)
```

```lisp
(revealer :reveal {show_content}
          :transition "slidedown"  ; slideright, slideleft, slideup, slidedown, crossfade, none
          :duration "300ms"
  (box "Hidden content"))
```

```lisp
(expander :name "Click to expand"
          :expanded false
  (box "Expandable content"))
```

```lisp
(transform :rotate 45
           :translate-x "10px"
           :translate-y "10px"
           :scale-x "1.5"
           :scale-y "1.5"
           :transform-origin-x "50%"
           :transform-origin-y "50%"
  (label :text "Transformed"))
```

```lisp
(tooltip
  (box "This is the tooltip content")
  (button "Hover for tooltip"))
```

```lisp
(systray :orientation "horizontal"
         :spacing 5
         :icon-size 24
         :space-evenly false
         :prepend-new true)
```

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

### View Eww Logs

Source: https://github.com/elkowar/eww/blob/master/docs/src/troubleshooting.md

This command displays the current logs for the Eww application, useful for diagnosing issues.

```bash
eww logs
```

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

### Open GTK Debugger

Source: https://github.com/elkowar/eww/blob/master/docs/src/working_with_gtk.md

Run this command in your terminal to open the GTK debugger for Eww. Use it to inspect and debug styling issues.

```bash
eww inspector
```

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

### Display Disk Usage using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Access the `EWW_DISK` magic variable to display disk usage percentage for a specific mount point, like '/'.

```lisp
; Disk information (updates every 2s)
; EWW_DISK = {"/" : {"name": "disk", "total": 500000000, "free": 200000000, "used": 300000000, "used_perc": 60}, ...}
(label :text "Disk: ${round(EWW_DISK["/"] .used_perc, 0)}%")
```

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

### Use a Widget with Children

Source: https://context7.com/elkowar/eww/llms.txt

When using a widget that accepts children, place the child elements within the widget's definition.

```lisp
; Using widget with children
(labeled-container :name "foo"
  (button :onclick "notify-send hey ho"
    "click me"))
```

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

### Debug Eww Widget Structure

Source: https://github.com/elkowar/eww/blob/master/docs/src/troubleshooting.md

This command provides detailed information about your widget's structure and other debugging data.

```bash
eww debug
```

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

### Inspect Eww State

Source: https://github.com/elkowar/eww/blob/master/docs/src/troubleshooting.md

Use this command to view the current state of all variables managed by Eww.

```bash
eww state
```

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

### Define a Labeled Container Widget

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Creates a 'labeled-container' widget that wraps its content in a box with a specific class. It uses the `children` placeholder to render any child widgets passed to it.

```lisp
(defwidget labeled-container [name]
  (box :class "container"
    name
    (children)))
```

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

### Eww Debugging and Inspection

Source: https://context7.com/elkowar/eww/llms.txt

Tools for debugging widget configurations and inspecting state. Includes GTK inspector, state viewing, variable retrieval, and graph generation.

```bash
# Open GTK inspector/debugger
ewww inspector

# Show current variable state
ewww state

# Show all variables including unused
ewww state --all

# Get specific variable value
ewww get my_variable

# Print widget structure
ewww debug

# Print scope graph in graphviz format
ewww graph

# View daemon logs
ewww logs

# Ping daemon to check if running
ewww ping
```

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

### Time Formatting with Timezone

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Demonstrates formatting a UNIX timestamp into a human-readable string using a specified format and timezone. Refer to chrono's documentation for format strings and timezones.

```lisp
formattime(unix_timestamp, "%Y-%m-%d %H:%M:%S", "America/New_York")
```

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

### Eww Interactive Widgets

Source: https://context7.com/elkowar/eww/llms.txt

These widgets enable user interaction, allowing for actions like clicks, changes, and input. Configure their behavior using specific event handlers.

```lisp
(button :onclick "notify-send 'Clicked!'"
        :onmiddleclick "xdg-open https://example.com"
        :onrightclick "eww close my_window"
        :timeout "200ms"
  "Click me")
```

```lisp
(eventbox :onclick "echo left"
          :onrightclick "echo right"
          :onmiddleclick "echo middle"
          :onscroll "echo {}"           ; {} = "up" or "down"
          :onhover "echo 'hovered at {} {}'"  ; x, y coordinates
          :onhoverlost "echo 'left'"
          :cursor "pointer"
          :ondropped "echo 'dropped: {} {}'"  ; uri, type
          :dragvalue "/path/to/file"
          :dragtype "file"              ; or "text"
  (label :text "Hover me"))
```

```lisp
(scale :min 0
       :max 100
       :value {volume}
       :orientation "horizontal"
       :flipped false
       :draw-value true
       :marks "0,25,50,75,100"
       :onchange "pamixer --set-volume {}")
```

```lisp
(input :value {search_text}
       :onchange "eww update search_text={}"
       :onaccept "search {}"
       :password false)
```

```lisp
(checkbox :checked {enabled}
          :onchecked "eww update enabled=true"
          :onunchecked "eww update enabled=false")
```

```lisp
(combo-box-text :items {["Option 1", "Option 2", "Option 3"]}
                :onchange "eww update selected={}")
```

```lisp
(color-button :use-alpha true
              :onchange "eww update color={}")
```

```lisp
(calendar :day {day}
          :month {month}
          :year {year}
          :show-heading true
          :show-day-names true
          :onclick "echo 'Selected: {0}/{1}/{2}'")  ; day, month, year
```

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

### Define Window with Arguments

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Define arguments within a `defwindow` block, similar to widget arguments. These arguments can be used to customize window properties like geometry.

```lisp
(defwindow my_bar [arg1 ?arg2]
          :geometry (geometry
                       :x      "0%"
                       :y      "6px"
                       :width  "100%"
                       :height { arg1 == "small" ? "30px" : "40px" }
                       :anchor "top center")
          :stacking   "bg"
          :windowtype "dock"
          :reserve    (struts :distance "50px" :side "top")
    (my_widget :arg2 arg2))
```

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

### Environment Variable Access

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Shows how to retrieve the value of an environment variable using the get_env function.

```lisp
get_env("MY_VARIABLE")
```

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

### Define a Widget that Accepts Children

Source: https://context7.com/elkowar/eww/llms.txt

Create widgets that can contain other UI elements by using the `(children)` form.

```lisp
; Widget that accepts children
(defwidget labeled-container [name]
  (box :class "container"
    name
    (children)))
```

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

### Open Many Windows with Specific Arguments

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

When using `open-many`, arguments for specific windows are passed after the window names, prefixed with the window ID and a colon (e.g., `id:arg_name=value`).

```bash
# Please note that `--arg` option must be given after all the windows names
ewww open-many my_bar:primary --arg primary:arg1=some_value --arg primary:arg2=another_value
```

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

### Define a Polling Variable with Initial Value

Source: https://context7.com/elkowar/eww/llms.txt

Provide an `:initial` value to `defpoll` for faster UI startup before the command first executes. This is useful for variables where a default state is acceptable.

```lisp
; With initial value for faster startup
(defpoll volume :interval "1s"
                :initial "50"
  "pamixer --get-volume")
```

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

### Byte Formatting (IEC)

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Formats a byte count into a human-readable string using IEC units (KiB, MiB, GiB). Supports negative byte counts and an option for compact output.

```lisp
formatbytes(bytes, false, "iec")
```

```lisp
formatbytes(bytes, true, "iec")
```

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

### Byte Formatting (SI)

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Formats a byte count into a human-readable string using SI units (KB, MB, GB). Supports negative byte counts and an option for compact output.

```lisp
formatbytes(bytes, false, "si")
```

```lisp
formatbytes(bytes, true, "si")
```

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

### Display Network Download Speed using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Access the `EWW_NET` magic variable to display network download speed for a specific interface, like 'eth0'.

```lisp
; Network information (updates every 2s)
; EWW_NET = {"eth0": {"NET_UP": 1024, "NET_DOWN": 2048}, ...}
(label :text "Down: ${EWW_NET.eth0.NET_DOWN} B/s")
```

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

### Basic Expression Language Usage

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Demonstrates embedding expressions within strings and conditional attribute values. Expressions can perform math, string interpolation, and conditional logic.

```lisp
(box
  "Some math: ${12 + foo * 10}"
  (button :class {button_active ? "active" : "inactive"}
          :onclick "toggle_thing"
    {button_active ? "disable" : "enable"}))
```

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

### Define Basic Static Variables

Source: https://context7.com/elkowar/eww/llms.txt

Use `defvar` to declare static variables that can be updated. This is suitable for configuration values or state that doesn't need frequent polling.

```lisp
; Define basic variables
(defvar foo "initial value")
(defvar visible false)
(defvar counter 0)

; JSON data structures
(defvar my_array `["item1", "item2", "item3"]`)
(defvar my_object `{"key": "value", "count": 42}`)

; Update via CLI: eww update foo="new value"
```

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

### Generate Widgets from JSON Array using 'for'

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use the `for` element to dynamically generate a list of widgets from a JSON array. This is preferred over `literal` for creating lists of elements.

```lisp
(defvar my-json "[1, 2, 3]")

; Then, inside your widget, you can use
(box
  (for entry in my-json
    (button :onclick "notify-send 'click' 'button ${entry}'"
      entry)))
```

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

### Manually Reload Eww

Source: https://github.com/elkowar/eww/blob/master/docs/src/troubleshooting.md

If hot reloading is not functioning, use this command to manually reload the Eww configuration.

```bash
eww reload
```

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

### Display RAM Usage using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Utilize the `EWW_RAM` magic variable to show RAM usage percentage. The `round` function formats the output.

```lisp
; RAM information (updates every 2s)
; EWW_RAM = {"total_mem": 16000000, "free_mem": 8000000, "available_mem": 10000000, "used_mem": 6000000, "used_mem_perc": 37.5, ...}
(label :text "RAM: ${round(EWW_RAM.used_mem_perc, 0)}%")
```

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

### Common Widget Properties in Lisp

Source: https://context7.com/elkowar/eww/llms.txt

Illustrates common properties applicable to all Eww widgets, such as class, alignment, expansion, dimensions, visibility, and styling via CSS. These properties control layout, appearance, and interaction.

```lisp
(box :class "my-class another-class"
     :valign "center"      ; fill, baseline, center, start, end
     :halign "center"
     :vexpand false
     :hexpand true
     :width 200
     :height 50
     :visible {show_widget}
     :active true          ; can be interacted with
     :tooltip "Hover text"
     :style "background: red; padding: 10px;"
     :css "button { color: blue; }")
```

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

### Perform Math Operations in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Use standard mathematical operators like addition, division, and modulo within widget expressions to perform calculations.

```lisp
; Math operations
(label :text "Result: ${12 + foo * 10}")
(label :text "Division: ${100 / 4}")
(label :text "Modulo: ${15 % 4}")
```

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

### Use Literal Widget for Dynamic Widget Generation

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

The `literal` widget allows generating entire widget structures dynamically from a string. Use this when the amount or structure of widgets is not known beforehand, but be mindful of performance implications.

```lisp
(defvar variable_containing_yuck
  "(box (button 'foo') (button 'bar'))")
```

```lisp
(literal :content variable_containing_yuck)
```

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

### jq Function Usage

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Illustrates using the jq function to process JSON data with jq-compatible filters. The 'r' flag can be used for raw output.

```lisp
jq(json_value, ".field | .subfield")
```

```lisp
jq(json_value, ".field | .subfield", ["r"])
```

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

### Use Regex Matching in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Apply regular expression matching using `=~` to conditionally apply styles or logic based on string patterns.

```lisp
; Regex matching
(label :class {workspace.name =~ '^special:.+$' ? "special" : "normal"})
```

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

### Kill Eww Daemon

Source: https://github.com/elkowar/eww/blob/master/docs/src/troubleshooting.md

Use this command to stop the Eww daemon. Re-open your window with the `--debug` flag afterwards for additional log output.

```bash
eww kill
```

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

### Display CPU Usage using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Access the `EWW_CPU` magic variable to display CPU usage. The `round` function is used for formatting.

```lisp
; CPU information (updates every 2s)
; EWW_CPU = {"cores": [{"core": "cpu0", "freq": 3600, "usage": 25}, ...], "avg": 30}
(label :text "CPU: ${round(EWW_CPU.avg, 0)}%")
```

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

### Define a Two-Box Widget with Specific Children

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Defines a 'two-boxes' widget that creates two nested boxes. It uses `children :nth 0` and `children :nth 1` to specifically render the first and second child widgets passed to it, respectively.

```lisp
(defwidget two-boxes []
  (box
    (box :class "first" (children :nth 0))
    (box :class "second" (children :nth 1))))
```

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

### Regex Match Operator

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Illustrates the regex match operator (=~). The left-hand side is the regex pattern, and the right-hand side is the string to test against. Supports Rust regex syntax.

```lisp
workspace.name =~ '^special:.+$'
```

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

### Eww Layout Widgets

Source: https://context7.com/elkowar/eww/llms.txt

Use these widgets to structure and organize content within your Eww interface. They control the arrangement and display of child elements.

```lisp
(box :orientation "horizontal" 
     :spacing 10
     :space-evenly false
     :halign "center"           ; start, center, end, fill
     :valign "center"
  (label :text "Item 1")
  (label :text "Item 2"))
```

```lisp
(centerbox :orientation "horizontal"
  (label :text "Left")
  (label :text "Center")
  (label :text "Right"))
```

```lisp
(scroll :hscroll true :vscroll false
  (box :orientation "vertical"
    ; long content here
    ))
```

```lisp
(overlay
  (image :path "/path/to/background.png")
  (label :text "Overlay text"))
```

```lisp
(stack :selected {current_page}
       :transition "slideright"
       :same-size true
  (box "Page 1 content")
  (box "Page 2 content")
  (box "Page 3 content"))
```

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

### Set Arguments for Un-IDed Windows in Open-Many

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

If a window in `open-many` does not have an explicit ID, arguments can still be targeted using the window configuration name as a prefix.

```bash
eww open-many my_primary_bar --arg my_primary_bar:screen=0
```

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

### Define a Basic Polling Variable

Source: https://context7.com/elkowar/eww/llms.txt

Use `defpoll` to create variables that update at a specified interval by executing a shell command. This is ideal for displaying frequently changing data like time or system status.

```lisp
; Basic polling variable
(defpoll time :interval "10s"
  "date '+%H:%M %b %d, %Y'")
```

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

### Display Formatted Unix Timestamp using Magic Variable

Source: https://context7.com/elkowar/eww/llms.txt

Access the `EWW_TIME` magic variable (Unix timestamp) and format it using the `formattime` function.

```lisp
; Unix timestamp (updates every 1s)
; EWW_TIME = 1699123456
(label :text {formattime(EWW_TIME, "%H:%M:%S")})
```

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

### Define a Widget with Indexed Children

Source: https://context7.com/elkowar/eww/llms.txt

Access specific children within a widget using `(children :nth index)`. This is useful for layouts where child order matters.

```lisp
; Widget with indexed children
(defwidget two-boxes []
  (box
    (box :class "first" (children :nth 0))
    (box :class "second" (children :nth 1))))
```

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

### Perform Comparison Operations in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Use comparison operators (>, ==) within expressions to conditionally render text or apply styles based on variable values.

```lisp
; Comparisons
(label :text {value > 50 ? "High" : "Low"})
(label :text {count == 0 ? "Empty" : "Has items"})
```

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

### Perform Boolean Operations in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Combine boolean variables using logical AND (`&&`) and NOT (`!`) operators to control widget visibility or text content.

```lisp
; Boolean operations
(box :visible {show_widget && user_logged_in})
(label :text {!hidden ? "Visible" : "Hidden"})
```

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

### Time Formatting without Timezone

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Shows formatting a UNIX timestamp using the system's local timezone. Uses chrono's documentation for format string details.

```lisp
formattime(unix_timestamp, "%Y-%m-%d %H:%M:%S")
```

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

### Use Elvis Operator for Default Values

Source: https://context7.com/elkowar/eww/llms.txt

The Elvis operator (`?:`) provides a default value if an expression evaluates to empty or null, simplifying conditional rendering.

```lisp
; Elvis operator (default for empty/null)
(label :text {title ?: "Unknown"})
```

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

### Use Safe Navigation Operator for Null Values

Source: https://context7.com/elkowar/eww/llms.txt

The safe navigation operator (`?.`) prevents errors when accessing properties of potentially null objects or elements in potentially null arrays.

```lisp
; Safe access for potentially null values
(label :text {data?.field ?: "N/A"})
(label :text {array?.[0] ?: "Empty"})
```

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

### Define a Basic Variable with defvar

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use `defvar` for variables that change infrequently or are updated by external scripts or user interactions. Explicitly update values using `eww update`.

```lisp
(defvar foo "initial value")
```

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

### Define a Conditional Polling Variable

Source: https://context7.com/elkowar/eww/llms.txt

Control the execution of a `defpoll` command using `:run-while`. The polling only occurs when the specified condition is true.

```lisp
; Conditional polling with run-while
(defvar time-visible false)
(defpoll time :interval "1s"
              :initial "00:00:00"
              :run-while time-visible
  `date +%H:%M:%S`)
```

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

### Update Eww Variables

Source: https://context7.com/elkowar/eww/llms.txt

Dynamically updates variable values in running widgets. Supports single or multiple variables and forcing a poll for defpoll variables.

```bash
# Update a single variable
ewww update my_variable="new value"

# Update multiple variables
ewww update volume=75 brightness=50

# Force poll a defpoll variable
ewww poll time
```

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

### Access Object Fields in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Access properties of JSON objects using dot notation or bracket notation within expressions.

```lisp
; Object field access
(label :text {my_object.field})
(label :text {my_object["field"]})
```

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

### Safe Access Operator

Source: https://github.com/elkowar/eww/blob/master/docs/src/expression_language.md

Shows the Safe Access operator (?.) for accessing object fields or array elements. It returns null if the left-hand side is null or an empty string, preventing errors.

```lisp
object.field?.nested_field
```

```lisp
array[index]?.[nested_index]
```

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

### Eww Built-in Functions for Data Manipulation

Source: https://context7.com/elkowar/eww/llms.txt

Utilize these functions within expressions for tasks like rounding, math operations, string manipulation, array/object handling, JSON filtering, environment variable access, time formatting, and byte formatting.

```lisp
(label :text {round(3.7, 0)})
```

```lisp
(label :text {floor(3.7)})
```

```lisp
(label :text {ceil(3.2)})
```

```lisp
(label :text {min(a, b)})
```

```lisp
(label :text {max(a, b)})
```

```lisp
(label :text {powi(2, 8)})
```

```lisp
(label :text {powf(2.5, 2.0)})
```

```lisp
(label :text {log(100, 10)})
```

```lisp
(label :text {sin(degtorad(45))})
```

```lisp
(label :text {cos(0)})
```

```lisp
(label :text {radtodeg(3.14159)})
```

```lisp
(label :text {strlength("hello")})
```

```lisp
(label :text {substring("hello", 0, 3)})
```

```lisp
(label :text {replace("hello", "l", "L")})
```

```lisp
(label :text {matches("test123", "[0-9]+")})
```

```lisp
(label :text {arraylength(my_array)})
```

```lisp
(label :text {objectlength(my_object)})
```

```lisp
(label :text {jq(json_data, ".users[] | .name")})
```

```lisp
(label :text {jq(json_data, ".value", "r")})
```

```lisp
(label :text {get_env("HOME")})
```

```lisp
(label :text {formattime(EWW_TIME, "%Y-%m-%d %H:%M:%S")})
```

```lisp
(label :text {formattime(EWW_TIME, "%H:%M", "America/New_York")})
```

```lisp
(label :text {formatbytes(1073741824, false, "iec")})
```

```lisp
(label :text {formatbytes(1000000000, true, "si")})
```

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

### Define a Polling Variable with defpoll

Source: https://github.com/elkowar/eww/blob/master/docs/src/configuration.md

Use `defpoll` to repeatedly run a shell script at a specified interval. Useful for frequently changing data like time, date, or system status. An optional `run-while` condition can control when polling is active.

```lisp
(defvar time-visible false)   ; for :run-while property of below variable
                              ; when this turns true, the polling starts and
                              ; var gets updated with given interval
```

```lisp
(defpoll time :interval "1s"
              :initial "initial-value"  ; optional, defaults to poll at startup
              :run-while time-visible   ; optional, defaults to 'true'
  `date +%H:%M:%S`)
```

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

### Define a Complex Polling Variable

Source: https://context7.com/elkowar/eww/llms.txt

Use `defpoll` with more complex shell commands to fetch and format data from external sources, such as web APIs.

```lisp
; Complex script
(defpoll weather :interval "30m"
  `curl -s "wttr.in/?format=%t"`)
```

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

### Access Array Elements in Expressions

Source: https://context7.com/elkowar/eww/llms.txt

Access elements of JSON arrays by their index using bracket notation within expressions.

```lisp
; Array index access
(label :text {my_array[0]})
(label :text {my_array[index]})
```

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

### Access Nested JSON Data

Source: https://context7.com/elkowar/eww/llms.txt

Combine dot and bracket notation to access deeply nested properties within JSON objects and arrays.

```lisp
; Nested access
(label :text {data.users[0].name})
(label :text {EWW_DISK["/"] .used_perc})
```

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