Pretty

Annotation type used to tag elements in a pretty-printed document for syntax highlighting purposes

Convert annotations to their corresponding color for syntax highlighting purposes

Pretty print an expression

This type determines whether to render code as ASCII or Unicode

Detect which character set is used for the syntax of an expression If any parts of the expression uses the Unicode syntax, the whole expression is deemed to be using the Unicode syntax.

Pretty-print an Expr using the given CharacterSet.

prettyCharacterSet largely ignores Notes. Notes do however matter for the layout of let-blocks:

>>> let inner = Let (Binding Nothing "x" Nothing Nothing Nothing (NaturalLit 1)) (Var (V "x" 0)) :: Expr Src ()
>>> prettyCharacterSet ASCII (Let (Binding Nothing "y" Nothing Nothing Nothing (NaturalLit 2)) inner)
let y = 2 let x = 1 in x
>>> prettyCharacterSet ASCII (Let (Binding Nothing "y" Nothing Nothing Nothing (NaturalLit 2)) (Note (Src unusedSourcePos unusedSourcePos "") inner))
let y = 2 in let x = 1 in x

This means the structure of parsed let-blocks is preserved.

Layout using layoutOpts

Tries hard to fit the document into 80 columns.

This also removes trailing space characters (' ') unless they are enclosed in an annotation.

Default layout options

Escape an environment variable if not a valid Bash environment variable

Escape a label if it is not valid when unquoted

Convert an expression representing a temporal value to Text, if possible

This is used by downstream integrations (e.g. `dhall-json` for treating temporal values as strings