package dune

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package dune
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Pretty printers

type +'tag t

A document that is not yet rendered. The argument is the type of tags in the document. For instance tags might be used for styles.

Basic combinators

val nop : _ t

A pretty printer that prints nothing

val seq : 'a t -> 'a t -> 'a t

seq x y prints x and then y

val concat : ?sep:'a t -> 'a t list -> 'a t

concat ?sep l prints elements in l separated by sep. sep defaults to nop.

val concat_map : ?sep:'a t -> 'b list -> f:('b -> 'a t) -> 'a t

Convenience function for List.map followed by concat

val verbatim : string -> _ t

An indivisible block of text

val char : char -> _ t

A single character

val text : string -> _ t

Print a bunch of text. The line may be broken at any spaces in the text.

val textf : ('a, unit, string, _ t) Pervasives.format4 -> 'a

Same as text but take a format string as argument.

val tag : 'a t -> tag:'a -> 'a t

tag t ~tag Tag the material printed by t with tag

Break hints

val space : _ t

Either a newline or a space, depending on whether the line is broken at this point.

val cut : _ t

Either a newline or nothing, depending on whether the line is broken at this point.

val break : nspaces:int -> shift:int -> _ t

Either a newline or nspaces spaces. If it is a newline, shift is added to the indentation level.

val newline : _ t

Force a newline to be printed

val map_tags : 'a t -> f:('a -> 'b) -> 'b t

Convert tags in a documents

val filter_map_tags : 'a t -> f:('a -> 'b option) -> 'b t

Boxes

Boxes are the basic components to control the layout of the text. Break hints such as space and cut may cause the line to be broken, depending on the splitting rules. Whenever a line is split, the rest of the material printed in the box is indented with indent.

val box : ?indent:int -> 'a t -> 'a t

Try to put as much as possible on each line. Additionally, a break hint always break the line if the breaking would reduce the indentation level (break with negative shift value).

val vbox : ?indent:int -> 'a t -> 'a t

Always break the line when encountering a break hint.

val hbox : 'a t -> 'a t

Print everything on one line, no matter what

val hvbox : ?indent:int -> 'a t -> 'a t

If possible, print everything on one line. Otherwise, behave as a vbox

val hovbox : ?indent:int -> 'a t -> 'a t

Try to put as much as possible on each line.

Common convenience functions

val enumerate : 'a list -> f:('a -> 'b t) -> 'b t

enumerate l ~f produces an enumeration of the form:

       - item1
       - item2
       - item3
       ...
val chain : 'a list -> f:('a -> 'b t) -> 'b t

chain l ~f is used to print a succession of items that follow each other. It produces an output of this form:

          item1
       -> item2
       -> item3
       ...

Operators

module O : sig ... end

Rendering

val render : Format.formatter -> 'a t -> tag_handler:(Format.formatter -> 'a -> 'a t -> unit) -> unit

Render a document to a classic formatter

val render_ignore_tags : Format.formatter -> 'a t -> unit
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