Show colour in `glimpse()`

[olivermagnanimous]

I'd love for glimpse() to show colour the same way that tibbles do, to easily notice NAs etc. Currently it can be a bit hard to take in as an undifferentiated wall of text. Perhaps colouring the commas that separate the values in the same dim colour used for the column type would help too.

[krlmlr]

Good idea. Would you like to contribute a PR? What kind of guidance would you need?

[ryanzomorrodi]

I also think it would be a nice feature to have NAs have more color for tables. I can send a PR if you'd like. The coloring of the commas seems like some more intensive work.

My thoughts

format_glimpse.default <- function(x, ...) {
  dims <- dim(x)

  if (!is.null(dims)) {
    dims_out <- paste0(dims, collapse = " x ")
    paste0("<", class(x)[[1]], "[", dims_out, "]>")
  } else {
    out <- format(x, trim = TRUE, justify = "none")
    out[is.na(x)] <- crayon_red(NA)

    out
  }
}

format_glimpse.character <- function(x, ...) {
  out <- encodeString(as.character(x), quote = '"')
  out[is.na(x)] <- crayon_red(NA)

  out
}

format_glimpse.factor <- function(x, ...) {
  if (any(grepl(",", levels(x), fixed = TRUE))) {
    out <- encodeString(as.character(x), quote = '"')
  } else {
    out <- format(x, trim = TRUE, justify = "none")
  }
  out[is.na(x)] <- crayon_red(NA)

  out
}

[moodymudskipper]

The glimpse() function is used to show conveniently the head of the data, similar to str() on data frames.

The displayed value are separated with comas, for more clarity we wish to color these comas, using the same color used to format the column types.