trim-margin: 简单的多行字符串布局

该工具包旨在简化Rust中多行字符串的使用。在Rust中嵌入多行字符串时，所有空白、制表符等都被保留，即使它们只是为了使代码布局更美观。

fn main() {
    println!("-----------------------");
    let misrepresented_multiline_string = "
        This is string
        spans over multiple lines,
        but its rendering preserves all whitespaces.

        Which is not what we usually intend in this case.
    ";
    println!("{}", misrepresented_multiline_string);
    println!("-----------------------");

    println!("-----------------------");
    let correctly_layouted_string = "For displaying
the a multiline strin properly
it would need to be layouted
like this.

Which is not very nice.";
    println!("{}", correctly_layouted_string);
    println!("-----------------------");
}

trim-margin工具包通过在多行字符串中引入边距来支持您进行适当的布局。通过在多行字符串中引入边距，trim_margin方法可以过滤掉不需要的空白和空行。

extern crate trim_margin;
use trim_margin::MarginTrimmable;

fn main() {
    let multiline_string_with_margin = "
        |This string has a margin
        |indicated by the '|' character.
        |
        |The following method call will remove ...
        | * a blank first/last line
        | * blanks before the margin prefix
        | * the margin prefix itself
    ".trim_margin().unwrap();
    println!("{}", multiline_string_with_margin);
}