Changelog • c4r

c4r (development version)

use_c4r_readme() now generates a README.Rmd that knits cleanly under output: github_document. The chunk exports the diagram to man/figures/README-architecture.svg via export_c4() and embeds it with knitr::include_graphics() so the diagram renders on GitHub, and the generated YAML sets always_allow_html: true as a safety net for the htmlwidget fallback when DiagrammeRsvg is not installed (#11).
use_c4r_vignette() now generates a vignette that builds cleanly under devtools::build_vignettes(). The bundled template previously called c4_from_package("."), which failed because knitr knits vignettes with the working directory set to vignettes/ (#12).

New use_c4r() family of usethis-style scaffolding helpers: use_c4r(), use_c4r_vignette(), use_c4r_pkgdown(), use_c4r_readme(), and use_c4r_action(). They add an architecture vignette, a pkgdown article entry, an optional README chunk, and a GitHub Actions workflow respectively.
New c4_from_package() builds a c4_builder from an R package’s DESCRIPTION (and optionally R/), turning Imports/Depends into external systems and source files into containers.
New c4 knitr engine: write declarative c4 chunks in R Markdown or Quarto. Engine is registered automatically on package load. See c4_knitr_engine() and c4_render_dsl().
New pkgdown_diagram() sets sensible width/height defaults for htmlwidget-based diagrams on Bootstrap 5 pkgdown sites; bundled inst/pkgdown/extra.css ensures responsive SVG sizing.
New RStudio addins “Insert C4 chunk” and “Insert C4 template” (insert_c4_chunk(), insert_c4_template()).

Added core C4 diagram creation functions:
- c4_person(), c4_system(), c4_container(), c4_component() for element creation
- c4_external_system() for external system elements
- c4_rel() for relationships between elements
- c4_context(), c4_container_diagram(), c4_component_diagram() for complete diagrams
Included multiple themes: default, dark, and blue
Added comprehensive input validation and error handling