Turn RHS of formula into a string or label

Equivalent of expr_text() and expr_label() for formulas.

f_text(x, width = 60L, nlines = Inf)

f_name(x)

f_label(x)

Arguments

x	A formula.
width	Width of each line.
nlines	Maximum number of lines to extract.

Examples

f <- ~ a + b + bc
f_text(f)
#> [1] "a + b + bc"
f_label(f)
#> [1] "`a + b + bc`"

# Names a quoted with ``
f_label(~ x)
#> [1] "`x`"
# Strings are encoded
f_label(~ "a\nb")
#> [1] "\"a\\nb\""
# Long expressions are collapsed
f_label(~ foo({
  1 + 2
  print(x)
}))
#> [1] "`foo(...)`"