Fix/positron onload#166
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From AI -- Problem. The whole working tree currently shows as modified in git, but git diff --ignore-all-space shows zero real changes — it is pure CRLF↔LF line-ending noise. Without fixing this first, every later PR diff is buried under thousands of phantom line-ending changes and nothing reviews cleanly. Change. Add a .gitattributes that forces LF for text files (* text=auto eol=lf plus explicit entries for .R, .Rmd, .Rd, .md, .yaml/.yml, DESCRIPTION, NAMESPACE, .Rproj) and marks binaries (.rda, .png, .ico, .svg) as binary. Set the RStudio project to write LF (LineEndingConversion: Posix in cmapplot.Rproj) so RStudio doesn't re-introduce CRLF on save. Run git add --renormalize . in the same commit. Files. .gitattributes (new), cmapplot.Rproj. Review note. The diff looks huge but is mechanical — "line endings only."
Problem. R/cmapplot.R (~lines 110–131) gates graphics setup on
rstudioapi::isAvailable() / rstudioapi::getVersion(). In Positron,
isAvailable() returns TRUE (Positron ships a partial rstudioapi shim), so
execution enters the RStudio branch, where getVersion() can error outside real
RStudio — risking an error on package load. The RStudioGD.backend option is
meaningless to Positron (its Ark device already auto-uses ragg), and the
"please install RStudio" fallback message is wrong advice for Positron users.
Change. Detect the IDE via environment variables instead:
RStudio: Sys.getenv("RSTUDIO") == "1"
Positron: Sys.getenv("POSITRON_VERSION") != ""
In RStudio, keep the existing RStudioGD.backend = "ragg" behavior. In
Positron, skip the option entirely and drop the RStudio-install message. Keep
the plain-R fallback message.
Files. R/cmapplot.R
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