hg-core: add `files_with_nodes` to `Manifest`

Differential Revision: https://phab.mercurial-scm.org/D9050

rust/hg-core/src/revlog/manifest.rs

@@ -1,60 +1,73 b''
 use crate::revlog::revlog::{Revlog, RevlogError};
 use crate::revlog::Revision;
 use crate::utils::hg_path::HgPath;
 use std::path::PathBuf;
 
 /// A specialized `Revlog` to work with `manifest` data format.
 pub struct Manifest {
     /// The generic `revlog` format.
     revlog: Revlog,
 }
 
 impl Manifest {
     /// Open the `manifest` of a repository given by its root.
     pub fn open(root: &PathBuf) -> Result<Self, RevlogError> {
         let index_file = root.join(".hg/store/00manifest.i");
         let revlog = Revlog::open(&index_file)?;
         Ok(Self { revlog })
     }
 
     /// Return the `ManifestEntry` of a given node id.
     pub fn get_node(&self, node: &[u8]) -> Result<ManifestEntry, RevlogError> {
         let rev = self.revlog.get_node_rev(node)?;
         self.get_rev(rev)
     }
 
     /// Return the `ManifestEntry` of a given node revision.
     pub fn get_rev(
         &self,
         rev: Revision,
     ) -> Result<ManifestEntry, RevlogError> {
         let bytes = self.revlog.get_rev_data(rev)?;
         Ok(ManifestEntry { bytes })
     }
 }
 
 /// `Manifest` entry which knows how to interpret the `manifest` data bytes.
 #[derive(Debug)]
 pub struct ManifestEntry {
     bytes: Vec<u8>,
 }
 
 impl ManifestEntry {
     /// Return an iterator over the lines of the entry.
     pub fn lines(&self) -> impl Iterator<Item = &[u8]> {
         self.bytes
             .split(|b| b == &b'\n')
             .filter(|line| !line.is_empty())
     }
 
     /// Return an iterator over the files of the entry.
     pub fn files(&self) -> impl Iterator<Item = &HgPath> {
         self.lines().filter(|line| !line.is_empty()).map(|line| {
             let pos = line
                 .iter()
                 .position(|x| x == &b'\0')
                 .expect("manifest line should contain \\0");
             HgPath::new(&line[..pos])
         })
     }
+
+    /// Return an iterator over the files of the entry.
+    pub fn files_with_nodes(&self) -> impl Iterator<Item = (&HgPath, &[u8])> {
+        self.lines().filter(|line| !line.is_empty()).map(|line| {
+            let pos = line
+                .iter()
+                .position(|x| x == &b'\0')
+                .expect("manifest line should contain \\0");
+            let hash_start = pos + 1;
+            let hash_end = hash_start + 40;
+            (HgPath::new(&line[..pos]), &line[hash_start..hash_end])
+        })
+    }
 }