main: Write YAML to standard output

Create an adapter from `std::fmt::Write` to `std::io::Write` based on
the following idea in the standard library:

https://github.com/rust-lang/rust/blob/master/library/std/src/io/mod.rs#L1634-L1652

Since `yaml_rust::YamlEmitter::new()` requires a `std::fmt::Write`,
adapt standard output so the emitter can write to it.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/yaml.rs b/src/yaml.rs
index 77665b3..9b0988c 100644
--- a/src/yaml.rs
+++ b/src/yaml.rs
@@ -5,9 +5,12 @@ use std::collections::HashMap;
 
 
 mod sql;
+mod write;
 
 pub(crate) use sql::*;
 
+pub use write::*;
+
 
 // TODO: Separate functions to get a list of YAML hashes, and insert hashes into
 // the database.