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Bruno Postle
018ee446b5
- ifcurl/service.py: FastAPI POST /preview → image/png with three caching tiers (bytes LRU, GUID-set LRU, PNG filesystem) - ifcurl/git.py: add fetch_ifc() returning (hexsha, bytes); refactor around _get_repo() and _read_commit_blob() helpers - ifcurl/__main__.py: add 'ifcurl serve' subcommand; no-args prints full help; all subcommands have descriptions and examples; URL format and parameter reference in every help page Generated with the assistance of an AI coding tool.
68 lines
3.1 KiB
Markdown
68 lines
3.1 KiB
Markdown
# CLAUDE.md
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This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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## Commands
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```bash
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pip install -e ".[render]" # install with rendering dependencies
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pip install -e ".[service]" # install with service dependencies (includes render)
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python -m pytest tests/ # run all tests
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python -m pytest tests/test_url.py -v
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ifcurl render "ifc://..." # render a URL to ifc-url-render.png
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ifcurl render "ifc://..." -o out.png
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ifcurl serve # start preview service on 127.0.0.1:8000
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ifcurl serve --host 0.0.0.0 --port 9000
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```
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## Project overview
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`ifcurl` implements the `ifc://` URL scheme — a way to address a specific view of an IFC model stored in a Git repository. A single URL encodes the git source, an optional IfcOpenShell selector, and an optional camera viewpoint.
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Full spec: `SPECIFICATION.md`. Full development plan: `PLAN.md`.
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## URL structure
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```
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ifc://[user@]host/org/repo@<ref>?<parameters>
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```
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Transport is inferred: `user@host` → SSH, bare `host` → HTTPS, empty authority (`ifc:///path`) → local file. Refs use git namespace form: `@heads/<branch>`, `@tags/<tag>`, `@<hash>`, `@HEAD`.
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Key query parameters: `path` (IFC file in repo), `selector` (IfcOpenShell selector expression), `camera` (9 floats: position, direction, up), `fov` (perspective) or `scale` (orthographic), `clip` (repeatable clipping plane, 6 floats), `visibility` (`highlight`/`ghost`/`isolate`).
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## Development phases
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| Phase | Description | Language |
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|---|---|---|
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| 1 | Python core library + CLI | Python |
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| 2 | HTTP preview service with caching | Python |
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| 3 | Gitea plugin for inline preview embedding | Go |
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| 4 | Bonsai integration (OS protocol handler + "Copy view URL") | Python |
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| 5 | IFC Viewer integration | Python |
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| 6 | `IFCDOCUMENTREFERENCE` federation extension | Python |
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Phase 1 is the foundation for all other phases. Phases 3–6 cannot begin until Phase 1 exists.
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## Phase 1 — Python core responsibilities
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- Parse `ifc://` URL into components
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- Infer git transport and fetch the IFC file at the specified ref
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- Execute an IfcOpenShell selector against the loaded model
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- Apply camera, clipping planes, and visibility mode
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- Render a static PNG (headless / software OpenGL)
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CLI entry point: `ifcurl render "<url>"`
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## Caching (Phase 2)
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Tier 2: commit hash → parsed model structure (shared across requests)
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Tier 3: commit hash + selector → resolved GUID set
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Tier 4: full URL hash → rendered PNG (**never** applied to mutable refs like `@heads/` or `@HEAD`)
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## Key domain facts
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- All spatial values (`camera`, `clip`) are in IFC world coordinates, matching BCF viewpoint conventions — not georeferenced survey coordinates.
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- The `selector` parameter uses IfcOpenShell selector syntax. `+` joins selector groups (union); `,` separates filters within a group.
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- `IFCDOCUMENTREFERENCE` location fields may be relative paths (resolved within the same repo/ref), absolute local paths (desktop only), or `ifc://` URLs (cross-repo federation).
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- BCF ↔ IFC URL conversion is defined in `SPECIFICATION.md` §6.
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