Restructure modules

Modules are now separated into a fashion where the library can be used
for most use cases, without needing to compile the rest.

The core of serenity, with no features enabled, contains only the
struct (model) definitions, constants, and prelude. Models do not have
most functions compiled in, as that is separated into the `model`
feature.

The `client` module has been split into 3 modules: `client`, `gateway`,
and `http`.

`http` contains functions to interact with the REST API. `gateway`
contains the Shard to interact with the gateway, requiring `http` for
retrieving the gateway URL. `client` requires both of the other features
and acts as an abstracted interface over both the gateway and REST APIs,
handling the event loop.

The `builder` module has been separated from `utils`, and can now be
optionally compiled in. It and the `http` feature are required by the
`model` feature due to a large number of methods requiring access to
them.

`utils` now contains a number of utilities, such as the Colour struct, the
`MessageBuilder`, and mention parsing functions.

Each of the original `ext` modules are still featured, with `cache` not
requiring any feature to be enabled, `framework` requiring the `client`,
`model`, and `utils`, and `voice` requiring `gateway`.

In total the features and their requirements are:

- `builder`: none
- `cache`: none
- `client`: `gateway`, `http`
- `framework`: `client`, `model`, `utils`
- `gateway`: `http`
- `http`: none
- `model`: `builder`, `http`
- `utils`: none
- `voice`: `gateway`

The default features are `builder`, `cache`, `client`, `framework`,
`gateway`, `model`, `http`, and `utils`.

To help with forwards compatibility, modules have been re-exported from
their original locations.

1 files changed, 16 insertions, 13 deletions

diff --git a/src/model/guild/partial_guild.rs b/src/model/guild/partial_guild.rs
index 3635a7a..780a6ca 100644
--- a/src/model/guild/partial_guild.rs
+++ b/src/model/guild/partial_guild.rs
@@ -1,6 +1,8 @@
 use super::super::utils::{deserialize_emojis, deserialize_roles};
 use ::model::*;
-use ::utils::builder::{EditGuild, EditMember, EditRole};
+
+#[cfg(feature="model")]
+use ::builder::{EditGuild, EditMember, EditRole};
 
 /// Partial information about a [`Guild`]. This does not include information
 /// like member data.
@@ -28,6 +30,7 @@ pub struct PartialGuild {
     pub verification_level: VerificationLevel,
 }
 
+#[cfg(feature="model")]
 impl PartialGuild {
     /// Ban a [`User`] from the guild. All messages by the
     /// user within the last given number of days given will be deleted. This
@@ -46,15 +49,15 @@ impl PartialGuild {
     ///
     /// # Errors
     ///
-    /// Returns a [`ClientError::DeleteMessageDaysAmount`] if the number of
+    /// Returns a [`ModelError::DeleteMessageDaysAmount`] if the number of
     /// days' worth of messages to delete is over the maximum.
     ///
-    /// [`ClientError::DeleteMessageDaysAmount`]: ../client/enum.ClientError.html#variant.DeleteMessageDaysAmount
+    /// [`ModelError::DeleteMessageDaysAmount`]: enum.ModelError.html#variant.DeleteMessageDaysAmount
     /// [`User`]: struct.User.html
     /// [Ban Members]: permissions/constant.BAN_MEMBERS.html
     pub fn ban<U: Into<UserId>>(&self, user: U, delete_message_days: u8) -> Result<()> {
         if delete_message_days > 7 {
-            return Err(Error::Client(ClientError::DeleteMessageDaysAmount(delete_message_days)));
+            return Err(Error::Model(ModelError::DeleteMessageDaysAmount(delete_message_days)));
         }
 
         self.id.ban(user, delete_message_days)
@@ -80,7 +83,7 @@ impl PartialGuild {
 
     /// Creates a [`GuildChannel`] in the guild.
     ///
-    /// Refer to [`rest::create_channel`] for more information.
+    /// Refer to [`http::create_channel`] for more information.
     ///
     /// Requires the [Manage Channels] permission.
     ///
@@ -95,7 +98,7 @@ impl PartialGuild {
     /// ```
     ///
     /// [`GuildChannel`]: struct.GuildChannel.html
-    /// [`rest::create_channel`]: ../client/rest/fn.create_channel.html
+    /// [`http::create_channel`]: ../http/fn.create_channel.html
     /// [Manage Channels]: permissions/constant.MANAGE_CHANNELS.html
     #[inline]
     pub fn create_channel(&self, name: &str, kind: ChannelType) -> Result<GuildChannel> {
@@ -115,7 +118,7 @@ impl PartialGuild {
     /// how to read an image from the filesystem and encode it as base64. Most
     /// of the example can be applied similarly for this method.
     ///
-    /// [`EditProfile::avatar`]: ../utils/builder/struct.EditProfile.html#method.avatar
+    /// [`EditProfile::avatar`]: ../builder/struct.EditProfile.html#method.avatar
     /// [`Guild::create_emoji`]: struct.Guild.html#method.create_emoji
     /// [`utils::read_image`]: ../utils/fn.read_image.html
     /// [Manage Emojis]: permissions/constant.MANAGE_EMOJIS.html
@@ -143,10 +146,10 @@ impl PartialGuild {
     ///
     /// # Errors
     ///
-    /// If the `cache` is enabled, returns a [`ClientError::InvalidPermissions`]
+    /// If the `cache` is enabled, returns a [`ModelError::InvalidPermissions`]
     /// if the current user does not have permission to perform bans.
     ///
-    /// [`ClientError::InvalidPermissions`]: ../client/enum.ClientError.html#variant.InvalidPermissions
+    /// [`ModelError::InvalidPermissions`]: enum.ModelError.html#variant.InvalidPermissions
     /// [`Guild::create_role`]: struct.Guild.html#method.create_role
     /// [Manage Roles]: permissions/constant.MANAGE_ROLES.html
     #[inline]
@@ -274,11 +277,11 @@ impl PartialGuild {
     ///
     /// # Errors
     ///
-    /// If the `cache` is enabled, returns a [`ClientError::InvalidPermissions`]
+    /// If the `cache` is enabled, returns a [`ModelError::InvalidPermissions`]
     /// if the current user does not have permission to change their own
     /// nickname.
     ///
-    /// [`ClientError::InvalidPermissions`]: ../client/enum.ClientError.html#variant.InvalidPermissions
+    /// [`ModelError::InvalidPermissions`]: enum.ModelError.html#variant.InvalidPermissions
     /// [Change Nickname]: permissions/constant.CHANGE_NICKNAME.html
     #[inline]
     pub fn edit_nickname(&self, new_nickname: Option<&str>) -> Result<()> {
@@ -407,7 +410,7 @@ impl PartialGuild {
     /// total, consider using [`utils::shard_id`].
     ///
     /// [`utils::shard_id`]: ../utils/fn.shard_id.html
-    #[cfg(feature="cache")]
+    #[cfg(all(feature="cache", feature="utils"))]
     #[inline]
     pub fn shard_id(&self) -> u64 {
         self.id.shard_id()
@@ -433,7 +436,7 @@ impl PartialGuild {
     ///
     /// assert_eq!(guild.shard_id(17), 7);
     /// ```
-    #[cfg(not(feature="cache"))]
+    #[cfg(all(feature="utils", not(feature="cache")))]
     #[inline]
     pub fn shard_id(&self, shard_count: u64) -> u64 {
         self.id.shard_id(shard_count)