hugohe3--ppt-master/skills/ppt-master/scripts/docs/update_spec.md

update_spec.py

Architecture rationale (why narrow scope, why no backups, the spec_lock as execution contract): see docs/technical-design.md "Spec Propagation".

Propagate a spec_lock.md value change to both the lock file and every svg_output/*.svg. The single edit surface for bulk style tweaks after generation.

Usage

python3 skills/ppt-master/scripts/update_spec.py <project_path> <section>.<key>=<value>

Bare <key>=<value> (no dot) is treated as colors.<key>=<value> for backward compat.

One invocation = one change. The tool:

1. Reads the old value from <project_path>/spec_lock.md
2. Writes the new value into spec_lock.md
3. Propagates the change into every .svg under svg_output/
4. Prints the list of files touched

Examples

# swap the primary color deck-wide (bare key → colors.primary)
python3 skills/ppt-master/scripts/update_spec.py projects/acme_ppt169_20260301 primary=#0066AA

# explicit section.key form
python3 skills/ppt-master/scripts/update_spec.py projects/acme_ppt169_20260301 colors.accent=#FF6B35

# change the deck-wide font family
python3 skills/ppt-master/scripts/update_spec.py projects/acme_ppt169_20260301 \
  'typography.font_family="Inter", Arial, sans-serif'

v2 scope

• Supported:
  • colors.* — HEX value replacement across svg_output/*.svg (case-insensitive).
  • typography.font_family — replaces the inner value of every font-family="..." / font-family='...' attribute.
• Not supported: typography sizes, icons, images, canvas, forbidden — these involve attribute-scoped or semantic replacements whose risk/benefit does not warrant bulk propagation. Edit spec_lock.md and the affected SVGs by hand, or re-author the pages.

When to use

• "Change the primary color across the whole deck" → one update_spec.py call
• "Switch the deck-wide font family" → one update_spec.py call
• "Switch an individual page's accent" → just edit that page's SVG directly
• "Re-design the palette / type system" → update spec_lock.md manually, then the Executor can regenerate affected pages

Safety

• HEX values (e.g. #005587) are unique enough in SVG content that literal replacement is safe
• font-family substitution is scoped to the attribute; the outer quote character is preserved, and switched automatically if the new value contains the same quote
• The tool refuses non-HEX inputs, unknown keys, and unsupported sections
• No backups are created — the project folder should be under git so you can diff / revert

Note on first font-family update

The script writes the spec_lock.md value verbatim into every SVG's font-family attribute. If the Executor generated SVGs with quote-flattened font names (e.g. font-family="Microsoft YaHei, Arial, sans-serif") while spec_lock.md holds the quoted form ("Microsoft YaHei", Arial, sans-serif), the first substitution will normalize every SVG to match the spec_lock.md literal (e.g. font-family='"Microsoft YaHei", Arial, sans-serif'). The two forms are semantically equivalent (CSS and DrawingML parse them identically), but the normalization produces byte-level diffs across every SVG that contains text. Subsequent updates only touch files where the value actually changes.