### Install libgcc on Alpine Docker Images

Source: https://github.com/mischov/meeseeks/blob/main/guides/deployment.md

Install the libgcc package on Alpine-based Docker images. This is required for the release stage if your Dockerfile separates build and release stages.

```dockerfile
RUN apk add --no-cache libgcc
```

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

### Define a Custom Comment Selector

Source: https://github.com/mischov/meeseeks/blob/main/guides/custom_selectors.md

Implement `Meeseeks.Selector` to create a custom selector that matches comments containing specific text. This example defines `CommentContainsSelector` which checks if a comment's content includes a given value.

```elixir
defmodule CommentContainsSelector do
  use Meeseeks.Selector

  alias Meeseeks.Document

  defstruct value: ""

  def match(selector, %Document.Comment{} = node, _document, _context) do
    String.contains?(node.content, selector.value)
  end

  def match(_selector, _node, _document, _context) do
    false
  end
end

selector = %CommentContainsSelector{value: "TODO"}

Meeseeks.one("<!-- TODO: Close vuln! -->", selector)
#=> #Meeseeks.Result<{ <!-- TODO: Close vuln! --> }>
```

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

### Extracting Element Attributes

Source: https://github.com/mischov/meeseeks/blob/main/guides/xpath_selectors.md

Use the `attr` extractor to get an element's attribute value, such as its class.

```elixir
Meeseeks.all(doc, xpath("//p[@class]"))
|> Enum.map(&Meeseeks.attr(&1, "class"))
```

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

### Select Node with CSS

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Selects the first node matching a CSS selector within a document. Ensure Meeseeks.CSS is imported.

```elixir
import Meeseeks.CSS
result = Meeseeks.one(document, css("#main p"))
#=> #Meeseeks.Result<{ <p>1</p> }>
```

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

### Select Node with XPath

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Selects the first node matching an XPath query within a document. Ensure Meeseeks.XPath is imported.

```elixir
import Meeseeks.XPath
result = Meeseeks.one(document, xpath("//*[@id='main']//p"))
#=> #Meeseeks.Result<{ <p>1</p> }>
```

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

### Add Rust Buildpack and Configure Heroku

Source: https://github.com/mischov/meeseeks/blob/main/guides/deployment.md

Add a Rust buildpack to your Heroku app and set the RUST_SKIP_BUILD environment variable. This ensures Rust is available and configured correctly before the Elixir build.

```bash
heroku buildpacks:add -i 1 https://github.com/emk/heroku-buildpack-rust.git
echo "RUST_SKIP_BUILD=1" > RustConfig
```

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

### Adding Meeseeks Dependency to Mix Project

Source: https://github.com/mischov/meeseeks/blob/main/README.md

This code snippet shows how to add the Meeseeks library as a dependency in your Elixir project's `mix.exs` file. After adding this, run `mix deps.get` to fetch the dependency.

```elixir
defp deps do
  [
    {:meeseeks, "~> 0.18.0"}
  ]
end
```

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

### Extracting Data from HTML with CSS Selectors

Source: https://github.com/mischov/meeseeks/blob/main/README.md

This snippet demonstrates how to fetch HTML content and extract specific data points like titles and URLs using Meeseeks with CSS selectors. It requires the HTTPoison library for fetching web content.

```elixir
import Meeseeks.CSS

html = HTTPoison.get!("https://news.ycombinator.com/").body

for story <- Meeseeks.all(html, css("tr.athing")) do
  title = Meeseeks.one(story, css(".title a"))

  %{ 
    title: Meeseeks.text(title),
    url: Meeseeks.attr(title, "href")
  }
end
#=> [%{title: "...", url: "..."}, %{title: "...", url: "..."}, ...]
```

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

### Parse HTML to Document

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Parses an HTML string into a Meeseeks.Document for querying. Parsing ahead of time is recommended for multiple selections on the same document.

```elixir
document = Meeseeks.parse("<div id=main><p>1</p><p>2</p><p>3</p></div>")
#=> #Meeseeks.Document<{...}>
```

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

### Constructing XPath with Variables

Source: https://github.com/mischov/meeseeks/blob/main/guides/xpath_selectors.md

When variable references are not supported in XPath, construct the string dynamically using Elixir variables.

```elixir
p = 2
xpath("*[position()=" <> Integer.to_string(p) <> "]")
```

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

### Selecting Second List Element Alternative

Source: https://github.com/mischov/meeseeks/blob/main/guides/xpath_selectors.md

Use this approach to select the second list element when top-level filter expressions are not supported.

```elixir
Meeseeks.all(doc, xpath("ol|ul")) |> Enum.at(1)
```

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

### Set RUSTFLAGS for Docker Build Stage

Source: https://github.com/mischov/meeseeks/blob/main/guides/deployment.md

Set the RUSTFLAGS environment variable during the Docker build stage. This is necessary to prevent compilation failures in mix compile.

```dockerfile
RUSTFLAGS='--codegen target-feature=-crt-static'
```

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

### Extract HTML from Document

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Extracts the entire HTML content of a Meeseeks.Document.

```elixir
Meeseeks.html(document)
#=> "<html><head></head><body><div id=\"main\"><p>1</p><p>2</p><p>3</p></div></body></html>"
```

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

### Extract Node Tree Structure

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Extracts the tree structure of a selected node as a tuple.

```elixir
Meeseeks.tree(result)
#=> {"p", [], ["1"]}
```

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

### Extract Text Content

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Extracts the text content of a selected node.

```elixir
Meeseeks.text(result)
#=> "1"
```

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

### Extract Tag Name

Source: https://github.com/mischov/meeseeks/blob/main/README.md

Extracts the tag name of a selected node.

```elixir
Meeseeks.tag(result)
#=> "p"
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.