PageTemplate/BlockTemplate/EmailWrapper return errors instead of
panicking so hosts can compile artifact-supplied templates at load time
(codeless themes) without a malformed artifact taking down the process;
Must* variants delegate. The 'lines' filter splits a string into
trimmed non-empty lines — pongo2 string literals cannot express \n, so
multi-line textarea fields (per-line <div> addresses) were previously
inexpressible in templates.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Decouple TemplateFunc from templ.Component by introducing a generic
HTMLComponent interface that both templ and pongo2 satisfy via Go
structural typing. Add a complete pongo2 rendering engine in
templates/pongo/ with page templates, block templates (with BlockContext
injection and icon processing), template overrides, and email wrappers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
