Capture a single PNG frame from a recorded R session — record_demo

Records the same R expression that record_demo() would, but instead of (or in addition to) the animated output, writes a single PNG frame using vhs's Screenshot directive.

Usage

record_demo_screenshot(
  expr,
  output = "demo.png",
  at = NULL,
  ...,
  backend = c("auto", "arf", "radian", "R"),
  quiet = FALSE
)

Arguments

expr: An R expression. See record_demo().
output: Path to the output PNG. Must end in .png.
at: Where to take the screenshot. NULL (default) → after the last typed line. A string "after:N" (1-indexed) → after the Nth line.
...: Pacing and styling arguments forwarded to tape_options(). Pass any of width, height, font_size, theme, typing_speed, playback_speed, line_pause, start_pause, end_pause, paragraph_pause, typing_speed_jitter by name. Unknown names error.
backend: Which interactive R front-end to record. "auto" (the default) prefers "arf" (a Rust-based modern R console with tree-sitter syntax highlighting and zero runtime dependencies — see https://github.com/eitsupi/arf), falls back to "radian" if found, otherwise plain "R".
quiet: If TRUE, suppress vhs stdout/stderr.

Value

Invisibly returns output.

Examples

if (FALSE) { # \dontrun{
record_demo_screenshot(
  { x <- 1:5; mean(x) },
  output = "demo.png"
)
} # }