Macro postcard

macro_rules! postcard {
    ($data:ty, $dir:expr, $project_directory:expr, $sub_directories:expr, $file_name:expr) => { ... };
}

Available on crate feature postcard only.

Implement the Postcard trait

File extension is bin and is automatically appended.

Input

These are the inputs you need to provide to implement Postcard.

Variable	Description	Related Trait Constant	Type	Example
$data	Identifier of the data to implement for		struct or enum	MyState
$dir	Which OS directory to use	Postcard::OS_DIRECTORY	Dir	Dir::Data
$project_directory	The name of the top project folder	Postcard::PROJECT_DIRECTORY	&str	"MyProject"
$sub_directories	(Optional) sub-directories before file	Postcard::SUB_DIRECTORIES	&str	"some/dirs"
$file_name	The file name to use	Postcard::FILE_NAME	&str	"state"

Example

use serde::{Serialize,Deserialize};
use disk::*;

postcard!(State, Dir::Data, "MyProject", "some/dirs", "state");
#[derive(Serialize,Deserialize)]
struct State {
    string: String,
    number: u32,
}

This example would be located at ~/.local/share/myproject/some/dirs/state.bin.