Move the builders to the utils

The builders aren't a large enough portion of the library to deserve
their own root-level module, so move them to the `utils` module.

Additionally, split them into separate files, as the library will be
receiving more builders and the single-file pattern was getting rather
large.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/utils/builder/create_embed.rs b/src/utils/builder/create_embed.rs
new file mode 100644
index 0000000..1abfb4e
--- /dev/null
+++ b/src/utils/builder/create_embed.rs
@@ -0,0 +1,42 @@
+use serde_json::builder::ObjectBuilder;
+use std::default::Default;
+
+/// A builder to create a fake [`Embed`] object, for use with the
+/// [`ExecuteWebhook::embeds`] method.
+///
+/// [`Embed`]: ../model/struct.Embed.html
+/// [`ExecuteWebhook::embeds`]: struct.ExecuteWebhook.html#method.embeds
+pub struct CreateEmbed(pub ObjectBuilder);
+
+impl CreateEmbed {
+    /// Set the colour of the left-hand side of the embed.
+    pub fn colour(self, colour: u64) -> Self {
+        CreateEmbed(self.0.insert("color", colour))
+    }
+
+    /// Set the description.
+    pub fn description(self, description: &str) -> Self {
+        CreateEmbed(self.0.insert("description", description))
+    }
+
+    /// Set the timestamp.
+    pub fn timestamp(self, timestamp: &str) -> Self {
+        CreateEmbed(self.0.insert("timestamp", timestamp))
+    }
+
+    /// Set the title.
+    pub fn title(self, title: &str) -> Self {
+        CreateEmbed(self.0.insert("title", title))
+    }
+
+    /// Set the URL.
+    pub fn url(self, url: &str) -> Self {
+        CreateEmbed(self.0.insert("url", url))
+    }
+}
+
+impl Default for CreateEmbed {
+    fn default() -> CreateEmbed {
+        CreateEmbed(ObjectBuilder::new())
+    }
+}