Lib.rs

Pretty Struct

Displays (json) structures and enums in a pretty way.

This crate is linked to the crud library. If I have time and motivation to generalize it, it can be an indenpendant crate.

Example

use crud_pretty_struct::PrettyPrint;
#[derive(PrettyPrint)]
struct Foo {
    #[pretty(color="green")]
    a: u32,
    #[pretty(skip_none)]
    b: Option<String>,
    #[pretty(formatter=crud_pretty_struct::formatters::bool_check_formatter)]
    c: bool,
    #[pretty(is_pretty)]
    d: OtherPrettyStruct
}
// Instanciate a `var` of type  `Foo`
println!("{}",var.pretty(true,None,None).expect("Can prettify var"));

Field Options

is_pretty

the nested struct implements PrettyPrint and should be printed using it.

use crud_pretty_struct_derive::PrettyPrint;
#[derive(PrettyPrint)]
struct OtherPrettyStruct {}
#[derive(PrettyPrint)]
struct Foo {
    #[pretty(is_pretty)]
    field: OtherPrettyStruct
}

label

custom label for this field

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(label="☀️ my field")]
    field: u32
}

color

custom color for the value of this field. The avaiable colors are [Color].

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(color="red")]
    field: u32
}

label_color

custom color for the label of dthis field. The avaiable colors are [Color].

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(label_color="red")]
    field: u32
}

skip

skip the field. It won't be display.

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(skip)]
    field: u32
}

skip_none

skip the field if the value is None. The type of the field should be an Option<T>.

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(skip_none)]
    field: Option<u32>
}

profile

the field is displayed only when this field profiles matched the profile declare when calling the pretty function.

#[derive(PrettyPrint)]
struct Foo {
  #[pretty(profiles = "a")]
  field1: u32,
  #[pretty(profiles = "a,b")]
  field2: bool,
}

let foo = Foo{field1:0, field2:false};
foo.pretty(false, None, Some("b")).unwrap(); //  print only `field2`

formatter

Custom value formatter for this field.

Some [formatters] are shipped in this crate.

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(formatter=crud_pretty_struct::formatters::bool_check_formatter)]
    field: bool
}

Formatters should follow this signature:

type Formatter = dyn Fn(/*value:*/ &dyn ToString, /*colored:*/ bool) -> miette::Result<(String, bool)>;

Parameters:

• value: the value to format
• colored: when true the formatted value can be colored

Result:

• String: the formatted value
• bool: returns true if the value have colors. returns false if the value don't have colors then default color will be applied.

#[derive(PrettyPrint)]
struct Foo {
    #[pretty(formatter=|x, _| Ok((format!("{} kg", x.to_string()), false)))]
    field: f32
}

Enum Option

Limitations on enums:

• unit variants are supported
• tuple variants with only 1 argument are supported

color

custom color for this variant avaiable colors are [Color].

#[derive(PrettyPrint)]
enum Foo {
    #[pretty(color="red")]
    Variant
}

label

custom label for this variant

#[derive(PrettyPrint)]
enum Foo {
    #[pretty(label="☀️ my field")]
    Variant
}