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Make a rule with one or two text labels

Source: R/rules.R
rule.Rd

The rule can include either a centered text label, or labels on the left and right side.

To color the labels, use the functions col_*, bg_* and style_* functions, see ANSI styles, and the examples below. To color the line, either these functions directly, or the line_col option.

Usage

rule(
  left = "",
  center = "",
  right = "",
  line = 1,
  col = NULL,
  line_col = col,
  background_col = NULL,
  width = console_width()
)

Arguments

left

Label to show on the left. It interferes with the center label, only at most one of them can be present.

center

Label to show at the center. It interferes with the left and right labels.

right

Label to show on the right. It interferes with the center label, only at most one of them can be present.

line

The character or string that is used to draw the line. It can also 1 or 2, to request a single line (Unicode, if available), or a double line. Some strings are interpreted specially, see Line styles below.

col

Color of text, and default line color. Either an ANSI style function (see ANSI styles), or a color name that is passed to make_ansi_style().

line_col, background_col

Either a color name (used in make_ansi_style()), or a style function (see ANSI styles), to color the line and background.

width

Width of the rule. Defaults to the width option, see base::options().

Value

Character scalar, the rule.

Details

Simple rule

rule()

Line styles

Some strings for the line argument are interpreted specially:

  • "single": (same as 1), a single line,

  • "double": (same as 2), a double line,

  • "bar1", "bar2", "bar3", etc., "bar8" uses varying height bars.

Double rule

rule(line = 2)

Bars

rule(line = "bar2")
rule(line = "bar5")

Custom lines

rule(center = "TITLE", line = "~")

rule(center = "TITLE", line = col_blue("~-"))

rule(center = bg_red(" ", symbol$star, "TITLE",
  symbol$star, " "),
  line = "\u2582",
  line_col = "orange")

Left label

rule(left = "Results")

Centered label

rule(center = " * RESULTS * ")

Colored labels

rule(center = col_red(" * RESULTS * "))

Colored line

rule(center = col_red(" * RESULTS * "), line_col = "red")