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curriculum-project-hub/render/templates/README.md
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ecc92c9a87 docs(adr): cph 的 nested-manifest / batch-export 改号 0036/0037
上游 0029/0030 与本地 filelib 侧同号 ADR 相撞,cph 两份改到本地空闲号段,
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# Default export templates (ADR-0011, outline shape ADR-0036)
`student.typ` / `teacher.typ` are the **framework default templates**. In a real
engineering file they live at `exports/student.typ` / `exports/teacher.typ`; the
project-creation flow seeds copies there (out of scope here — see ADR-0011 Open
Questions). They are kept here as the canonical, copyable defaults and for the
offline smoke test below.
Each template:
1. reads the injected manifest: `toml(sys.inputs.manifest)`;
2. loops `manifest.outline` (ADR-0036's depth-first rendering order — elements
interleaved with section headings at their DFS-open position). For an
`type = "element"` entry: `include`-ing each content field via a computed
**root-relative absolute** path `/<part.path>/<field>.typ`, and reading
scalar fields (example `source`) from `/<part.path>/element.toml`. For a
`type = "section"` entry: passing its `title`/`depth` straight through — no
content to load, it is a heading;
3. assembles an `outline` array of entry dicts and calls `cph-render`'s
`render-lesson(...)`, passing the per-level heading numbering (presentation
lives in the template).
## Why the include loop is in the template, not in cph-render
typst resolves a dynamic `include`/`toml` path relative to **the file the call
lexically appears in**, and a package (`@local/cph-render`) has its **own virtual
root**. A dynamic `include` written inside the package resolves against the
*package* dir — even an absolute `/segments/x.typ` — never the engineering
`--root`. Verified empirically. The template lives under `--root`, so its
`/<part.path>/<field>.typ` resolves against `--root`. Hence the template loads
content and hands `render-lesson` an already-assembled `outline` array;
`render-lesson` never includes anything.
## Key path facts for the engine
- **Template is the typst main file.** Compile it directly.
- **`--root` = engineering-file root.** Content `include`s use absolute
root-relative paths.
- **Manifest is injected as a root-relative ABSOLUTE path**:
`--input manifest=/manifest.toml`. `toml(sys.inputs.manifest)` resolves
relative to the *template's* location (`exports/`), so a bare
`manifest=manifest.toml` would look in `exports/`. Pass the leading `/`.
- **Optional content presence** (lemma `proof`): typst has no file-exists
primitive, so the template cannot probe disk. It reads a per-element
`fields` array from the manifest listing the content fields present on
disk. *(OPEN: the exact manifest shape for this is for the Rust/manifest
contract to pin.)*
- **Sections carry no content fields.** A `type = "section"` outline entry
(ADR-0036) has only `kind`/`title`/`depth`/`path`; the template passes it
through untouched — no `include`, no `element.toml` read.
## Offline smoke test
`@local/cph-render` is resolved from a local-packages dir (a symlink to the
render package root — regenerable, test-only):
```sh
cd render
# one-time: make @local/cph-render resolvable offline
mkdir -p vendor/local-packages/local/cph-render
ln -sfn "$(pwd)" vendor/local-packages/local/cph-render/0.1.0
# compile a template against the smoke engineering file
typst compile --root examples/smoke-eng \
--package-path ./vendor/local-packages \
--package-cache-path ./vendor/typst-packages \
--input manifest=/manifest.toml \
examples/smoke-eng/exports/student.typ /tmp/cph-tmpl-student.pdf
```
(`examples/smoke-eng/exports/{student,teacher}.typ` are copies of the defaults
here, mirroring how a real engineering file carries its own templates. The
`examples/smoke-eng/manifest.toml` is hand-authored directly in the augmented
`[[outline]]` shape that `cph_typst::build_augmented_manifest` would otherwise
produce, since this smoke test bypasses the Rust engine entirely.)