rust-dirstate: create dirstate submodule

This change is here to facilitate a future patch that is written in a
different file. I expect this module to grow a few different files.

Differential Revision: https://phab.mercurial-scm.org/D6389

rust/hg-core/src/dirstate/mod.rs

@@ -0,0 +1,28 b''
+pub mod parsers;
+
+#[derive(Debug, PartialEq, Copy, Clone)]
+pub struct DirstateParents<'a> {
+    pub p1: &'a [u8],
+    pub p2: &'a [u8],
+}
+
+/// The C implementation uses all signed types. This will be an issue
+/// either when 4GB+ source files are commonplace or in 2038, whichever
+/// comes first.
+#[derive(Debug, PartialEq)]
+pub struct DirstateEntry {
+    pub state: i8,
+    pub mode: i32,
+    pub mtime: i32,
+    pub size: i32,
+}
+
+pub type DirstateVec = Vec<(Vec<u8>, DirstateEntry)>;
+
+#[derive(Debug, PartialEq)]
+pub struct CopyVecEntry<'a> {
+    pub path: &'a [u8],
+    pub copy_path: &'a [u8],
+}
+
+pub type CopyVec<'a> = Vec<CopyVecEntry<'a>>;

rust/hg-core/src/dirstate/parsers.rs

@@ -6,31 +6,10 b''
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use std::collections::HashMap;
 use std::io::Cursor;
-use {DirstatePackError, DirstateParseError};
-
-#[derive(Debug, PartialEq, Copy, Clone)]
-pub struct DirstateParents<'a> {
-    pub p1: &'a [u8],
-    pub p2: &'a [u8],
-}
-/// The C implementation uses all signed types. This will be an issue
-/// either when 4GB+ source files are commonplace or in 2038, whichever
-/// comes first.
-#[derive(Debug, PartialEq)]
-pub struct DirstateEntry {
-    pub state: i8,
-    pub mode: i32,
-    pub mtime: i32,
-    pub size: i32,
-}
-pub type DirstateVec = Vec<(Vec<u8>, DirstateEntry)>;
-
-#[derive(Debug, PartialEq)]
-pub struct CopyVecEntry<'a> {
-    pub path: &'a [u8],
-    pub copy_path: &'a [u8],
-}
-pub type CopyVec<'a> = Vec<CopyVecEntry<'a>>;
+use {
+    CopyVec, CopyVecEntry, DirstateEntry, DirstatePackError, DirstateParents,
+    DirstateParseError, DirstateVec,
+};
 
 /// Parents are stored in the dirstate as byte hashes.
 const PARENT_SIZE: usize = 20;

rust/hg-core/src/lib.rs

@@ -15,8 +15,8 b' mod dirstate;'
 pub mod discovery;
 pub mod testing; // unconditionally built, for use from integration tests
 pub use dirstate::{
-    pack_dirstate, parse_dirstate, CopyVec, CopyVecEntry, DirstateEntry,
-    DirstateParents, DirstateVec,
+    parsers::{pack_dirstate, parse_dirstate},
+    CopyVec, CopyVecEntry, DirstateEntry, DirstateParents, DirstateVec,
 };
 mod filepatterns;