maker 0.0.2

Generic Rusty declarative build system like GNU Make
Documentation 
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# maker

Generic Rusty declarative build system, like [GNU Make](https://www.gnu.org/software/make/).

Allows writing some Makefile-like rules, e.g.

```rust
let obj = Target::new_file("main.o")
    .depends_on_file("main.c")
    .recipe(|target, deps| {
        Command::new("gcc")
            .arg("-o")
            .arg(target)
            .args(deps)
            .status()
            .unwrap();
    });
let bin = Target::new_file("main")
    .depends_on_target(obj)
    .recipe(|target, deps| {
        Command::new("ld")
            .arg("-o")
            .arg(target)
            .args(deps)
            .status()
            .unwrap();
    });
bin.make();
```

... which is equivalent to the Makefile:

```makefile
main.o: main.c
    gcc -o $@ $^
main: main.0
    ld -o $@ $^
```

... but see that `.recipe()` function? We can not only write shell scripts there, but also do **more things fun and cross-platform** (meanings of _generic_) -- in **Rust**!

In the hope that it will be useful in `build.rs` and [xtask](https://github.com/matklad/cargo-xtask).