Add config section for mailmap.{blob,file}.

These keys are not used at the moment, but will be introduced
as part of the work performed under Byron#1125.

gix/src/config/tree/mod.rs

@@ -45,6 +45,8 @@ pub(crate) mod root {
         pub const INDEX: sections::Index = sections::Index;
         /// The `init` section.
         pub const INIT: sections::Init = sections::Init;
+        /// The `mailmap` section.
+        pub const MAILMAP: sections::Mailmap = sections::Mailmap;
         /// The `pack` section.
         pub const PACK: sections::Pack = sections::Pack;
         /// The `protocol` section.
@@ -78,6 +80,7 @@ pub(crate) mod root {
                 &Self::HTTP,
                 &Self::INDEX,
                 &Self::INIT,
+                &Self::MAILMAP,
                 &Self::PACK,
                 &Self::PROTOCOL,
                 &Self::REMOTE,
@@ -93,8 +96,8 @@ pub(crate) mod root {
 mod sections;
 pub use sections::{
     branch, checkout, core, credential, extensions, fetch, gitoxide, http, index, protocol, remote, ssh, Author,
-    Branch, Checkout, Clone, Committer, Core, Credential, Extensions, Fetch, Gitoxide, Http, Index, Init, Pack,
-    Protocol, Remote, Safe, Ssh, Url, User,
+    Branch, Checkout, Clone, Committer, Core, Credential, Extensions, Fetch, Gitoxide, Http, Index, Init, Mailmap,
+    Pack, Protocol, Remote, Safe, Ssh, Url, User,
 };
 #[cfg(feature = "blob-diff")]
 pub use sections::{diff, Diff};

gix/src/config/tree/sections/mailmap.rs

@@ -0,0 +1,21 @@
+use crate::config::{
+    tree::{keys, Key, Mailmap, Section},
+    Tree,
+};
+
+impl Mailmap {
+    /// The `mailmap.blob` key
+    pub const BLOB: keys::Any = keys::Any::new("blob", &Tree::MAILMAP);
+    /// The `mailmap.file` key
+    pub const FILE: keys::Any = keys::Any::new("file", &Tree::MAILMAP);
+}
+
+impl Section for Mailmap {
+    fn name(&self) -> &str {
+        "mailmap"
+    }
+
+    fn keys(&self) -> &[&dyn Key] {
+        &[&Self::BLOB, &Self::FILE]
+    }
+}

gix/src/config/tree/sections/mod.rs

@@ -72,6 +72,10 @@ pub mod index;
 pub struct Init;
 mod init;
 
+#[derive(Copy, Clone, Default)]
+pub struct Mailmap;
+mod mailmap;
+
 /// The `pack` top-level section.
 #[derive(Copy, Clone, Default)]
 pub struct Pack;