2026-08-07 Fri

Learning, Lisp & Q&A

3

1. 01

   Missing properties are errors, not defaults

   [2026-08-07] · src —

   • elisp

   orrery-model--prop! signals an error naming the offending panel or item when a required property is absent, following the same rule as the home-manager config next door.

   Why

   A silent default renders a plausible-looking dashboard that is quietly wrong, and you find out weeks later. A build that refuses to run tells you now.

2. 02

   The build takes its clock as an argument

   [2026-08-07] · src —

   • elisp
   • testing

   orrery-build-ir receives generated-at rather than calling current-time. Only orrery-build-batch reads the clock.

   Why

   A function that reads the clock cannot be compared against a stored expectation. Passing the timestamp in is what makes make golden possible at all, and golden comparison is the regression net behind every future parser change.

3. 03

   Orrery core build landed: model and feed to IR to two renderers

   [2026-08-07] · src this repository

   • orrery
   • elisp

   Six Elisp files under build/: orrery-model.el reads the hand-authored registry, orrery-feed.el merges agent fragments, orrery-ir.el produces and validates dist/ir.json, and two renderers turn that same IR into an Org digest and a standalone page.

   Why

   The renderers never read Org and the parsers never emit HTML, so a third output target costs one new file and no changes to anything upstream.