github-samples/agents-in-sdlc/publish-to-pages

publish-to-pages

Publish any presentation or web content to GitHub Pages in one shot.

1. Prerequisites Check

Run these silently. Only surface errors:

command -v gh >/dev/null || echo "MISSING: gh CLI — install from https://cli.github.com"
gh auth status &>/dev/null || echo "MISSING: gh not authenticated — run 'gh auth login'"
command -v python3 >/dev/null || echo "MISSING: python3 (needed for PPTX conversion)"

poppler-utils is optional (PDF conversion via pdftoppm). Don't block on it.

2. Input Detection

Determine input type from what the user provides:

Ask the user for a repo name if not provided. Default: filename without extension.

3. Conversion

Large File Handling

Both conversion scripts automatically detect large files and switch to external assets mode:

• PPTX: Files >20MB or with >50 images → images saved as separate files in assets/
• PDF: Files >20MB or with >50 pages → page PNGs saved in assets/
• Files >150MB print a warning (PPTX suggests PDF path instead)

This keeps individual files well under GitHub's 100MB limit. Small files still produce a single self-contained HTML.

You can force the behavior with --external-assets or --no-external-assets.

HTML

No conversion needed. Use the file directly as index.html.

PPTX

Run the conversion script:

python3 SKILL_DIR/scripts/convert-pptx.py INPUT_FILE /tmp/output.html
# For large files, force external assets:
python3 SKILL_DIR/scripts/convert-pptx.py INPUT_FILE /tmp/output.html --external-assets

If python-pptx is missing, tell the user: pip install python-pptx

PDF

Convert with the included script (requires poppler-utils for pdftoppm):

python3 SKILL_DIR/scripts/convert-pdf.py INPUT_FILE /tmp/output.html
# For large files, force external assets:
python3 SKILL_DIR/scripts/convert-pdf.py INPUT_FILE /tmp/output.html --external-assets

Each page is rendered as a PNG and embedded into HTML with slide navigation. If pdftoppm is missing, tell the user: apt install poppler-utils (or brew install poppler on macOS).

Google Slides

1. Extract the presentation ID from the URL (the long string between /d/ and /)
2. Download as PPTX:

curl -L "https://docs.google.com/presentation/d/PRESENTATION_ID/export/pptx" -o /tmp/slides.pptx

1. Then convert the PPTX using the convert script above.

4. Publishing

Visibility

Repos are created public by default. If the user specifies private (or wants a private repo), use --private — but note that GitHub Pages on private repos requires a Pro, Team, or Enterprise plan.

Publish

bash SKILL_DIR/scripts/publish.sh /path/to/index.html REPO_NAME public "Description"

Pass private instead of public if the user requests it.

The script creates the repo, pushes index.html (plus assets/ if present), and enables GitHub Pages.

Note: When external assets mode is used, the output HTML references files in assets/. The publish script automatically detects and copies the assets/ directory alongside the HTML file. Make sure the HTML file and its assets/ directory are in the same parent directory.

5. Output

Tell the user:

• Repository: https://github.com/USERNAME/REPO_NAME
• Live URL: https://USERNAME.github.io/REPO_NAME/
• Note: Pages takes 1-2 minutes to go live.

Error Handling

• Repo already exists: Suggest appending a number (my-slides-2) or a date (my-slides-2026).
• Pages enablement fails: Still return the repo URL. User can enable Pages manually in repo Settings.
• PPTX conversion fails: Tell user to run pip install python-pptx.
• PDF conversion fails: Suggest installing poppler-utils (apt install poppler-utils or brew install poppler).
• Google Slides download fails: The presentation may not be publicly accessible. Ask user to make it viewable or download the PPTX manually.