Added copy button to the code cells in the Keras.io website

[buildwithsuhana]

This pull request adds a copy button to the code cells on the keras.io website. It shows a tooltip saying "Copied" when the user clicks on the button and copies the code.

This is how the code cell appears now:

After the copy button is clicked:

For code cells like below the code output is as shown:

Copied content:
layer = Dense(3)
layer.build(input_shape=(None, 3)) # Create the weights of the layer
layer.trainable
layer.trainable_weights
layer.trainable = False
layer.trainable_weights

Copied content:
model = Sequential([
ResNet50Base(input_shape=(32, 32, 3), weights='pretrained'),
Dense(10),
])
model.layers[0].trainable = False # Freeze ResNet50Base.

assert model.layers[0].trainable_weights == [] # ResNet50Base has no trainable weights.
assert len(model.trainable_weights) == 2 # Just the bias & kernel of the Dense layer.

model.compile(...)
model.fit(...) # Train Dense while excluding ResNet50Base.

[gemini-code-assist]

Summary of Changes

Hello @buildwithsuhana, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the user experience on the Keras.io website by integrating a convenient copy-to-clipboard button directly into all code cells. This feature allows users to effortlessly copy code snippets, streamlining their workflow and enhancing the overall interactivity of the documentation.

Highlights

• Copy Button Implementation: A new add_copy_buttons_to_code function has been introduced in scripts/autogen_utils.py to dynamically inject a copy button and its container (code__container) into HTML code blocks generated from markdown. This function uses regular expressions to identify <pre> tags and wraps them, while also including logic to skip specific types of code blocks (e.g., Keras model summaries or default code blocks).
• Styling for Copy Button and Tooltip: New CSS rules have been added to theme/css/docs.css to style the appearance and positioning of the copy button (code__copy--button), its container, and the accompanying 'Copied!' tooltip (code__copy--tooltip). This includes absolute positioning, hover effects, and initial hidden state for the tooltip.
• JavaScript Copy Logic Enhancement: The theme/js/index.js file has been updated to refine the copy functionality. The code now targets the generic <code> element within the parent container for copying, making it more robust than the previous .language-python selector. Additionally, the tooltip's text dynamically changes to 'Copied!' upon successful copy and reverts after a short delay, providing clear user feedback.

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[gemini-code-assist]

Code Review

This pull request adds a copy button to code cells, which is a great usability improvement. The implementation is solid. I have a few suggestions to improve maintainability, adhere to modern web standards, and clean up the code. My main points are replacing a deprecated JavaScript API for copying text, ensuring color consistency in the CSS, and simplifying some Python logic.

[abheesht17]

Thanks, this looks great! Two comments:

• Can the copy button be shifted more towards the top-right? The position here looks a bit off:

• Curious to know how to works for code cells with ">>>". Does it copy the arrows too?

[abheesht17]

LGTM, thanks!