#### bar-line-interface

Bar line.

Print a special bar symbol. It replaces the regular bar symbol with a special symbol. The argument bartype is a string which specifies the kind of bar to print. Options are `:|`, `|:`, `:|:`, `||`, `|.`, `.|`, and `.|.`.

These produce, respectively, a right repeat, a left repeat, a double repeat, a double bar, a start bar, an end bar, and a thick double bar. If bartype is set to `empty` then nothing is printed, but a line break is allowed at that spot.

##### User settable properties:

`bar-size` (dimension, in staff space)
  size of a bar line.
`bar-size-procedure` (procedure)
  Procedure that computes the size of a bar line.
`break-glyph-function` (procedure)
  This function determines the appearance of a bar line at the line break. It takes a glyph and break-direction and returns the glyph at a line break.
`glyph` (string)
  a string determining what (style) of glyph is typeset. Valid choices depend on the function that is reading this property.
`hair-thickness` (number)
  Thickness of the thin line in a bar line.
`kern` (dimension, in staff space)
  Amount of extra white space to add. For bar line, this is the amount of space after a thick line.
`thick-thickness` (number)
  Bar line thickness, measured in `linethickness`.
`thin-kern` (number)
  The space after a hair-line in a bar line.

This grob interface is used in the following graphical objects: BarLine and SpanBar

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