deck-assembler

/deck-assembler

Assemble a complete PowerPoint presentation from the DeckContext contracts in ./tmp/deck/.

Prerequisites

All of these DeckContext files must exist before running:

• ./tmp/deck/outline.json (SlideOutline)
• ./tmp/deck/style-guide.json (StyleGuide)
• ./tmp/deck/image-manifest.json (ImageManifest)
• ./tmp/deck/chart-manifest.json (ChartManifest)
• ./tmp/deck/speaker-notes.json (SpeakerNotes)
• ./tmp/deck/strategy-map.json (StrategyMap) — optional, controls per-slide rendering approach
• ./tmp/deck/images/ directory with referenced image files

Usage

Routing: Check for ./tmp/deck/template-profile.json first.

Template mode (template-profile.json exists):

PYTHONPATH="$PLUGIN_ROOT" python3 -c "
import json
from src.assembler.build_deck_template import build_deck
with open('./tmp/deck/template-profile.json') as f:
    profile = json.load(f)
output = build_deck('./tmp/deck', profile['template_path'], profile)
print(f'Template deck assembled: {output}')
"

Standard mode (no template):

node src/assembler/build_deck.js --deck-dir ./tmp/deck

Default deck-dir is ./tmp/deck if not specified.

Output

./tmp/deck/output/presentation.pptx

What It Does

1. Reads all DeckContext JSON contracts
2. Validates that referenced image assets exist
3. Creates PptxGenJS slide masters for all 12 slide types based on StyleGuide
4. Iterates through SlideOutline, building each slide with:
   • Correct master/layout per slide_type
   • Headline and body points with StyleGuide typography
   • Images from ImageManifest placed in correct zones
   • Chart images from ChartManifest for data_chart slides
   • Speaker notes from SpeakerNotes contract
   • If strategy-map.json exists, routes slides to full_render (full-bleed AI image), backdrop_render (AI background + text overlay), or composed (standard) assembly paths
5. Generates progressive build slides for bullets with build_animation cues
6. Writes the assembled .pptx to the output directory
7. Reports file size and any asset warnings

Design Rules (from existing pptx skill)

• 0.5" minimum margins on all sides
• Never use # prefix on hex colours (PptxGenJS convention)
• Do not reuse option objects (PptxGenJS mutates them)
• Left-align body text, centre only titles
• Do not place accent lines under titles

Limitations

• No native animations (PptxGenJS v4.0.1 limitation) -- uses progressive builds for ~80% coverage
• No gradient fills on shapes -- use pre-rendered gradient images as backgrounds
• Template mode requires python-pptx — PptxGenJS path does not support templates