glc: list the latest change to each entry of the current git tree

Walks the commit history of a git repository, listing the most recent
commit to change each entry of the initial top-level tree.

Signed-off-by: tjh <[e-mail]>
Change-Id: I6a6a6964e3b37227790b42bac4610b3884a7cab5

.gitignore

···
+/target

Cargo.lock

···
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Cargo.toml

···
+[package]
+name = "glc"
+version = "0.1.0"
+authors = ["tjh <[e-mail]>"]
+license = "MIT"
+edition = "2024"
+rust-version = "1.85"
+publish = false
+
+[dependencies]
+anyhow = "1.0.98"
+clap = { version = "4.5.39", features = ["derive"] }
+gix = { version = "0.72.1", default-features = false }
+time = { version = "0.3.41", features = ["formatting"] }
+
+[profile.release]
+strip = true
+lto = "fat"

README.md

···
+# git-latest-change
+
+Prints the most recent change to each top-level entry in a git repository.

deny.toml

···
+[graph]
+targets = [
+    "x86_64-unknown-linux-gnu"
+]
+all-features = false
+no-default-features = false
+
+[output]
+feature-depth = 1
+
+[advisories]
+ignore = []
+
+[licenses]
+confidence-threshold = 0.9
+allow = [
+    "Apache-2.0",
+    "MIT",
+    "Unicode-3.0",
+    "Zlib"
+]
+
+[licenses.private]
+ignore = true
+registries = []
+
+[bans]
+multiple-versions = "warn"
+wildcards = "allow"
+highlight = "all"
+workspace-default-features = "allow"
+external-default-features = "allow"
+allow = []
+deny = []
+
+skip = []
+skip-tree = []
+
+[sources]
+unknown-registry = "warn"
+unknown-git = "warn"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = []
+
+[sources.allow-org]
+github = []
+gitlab = []
+bitbucket = []

src/cli.rs

···
+use clap::{Parser, ValueHint};
+use std::path::PathBuf;
+
+pub fn parse() -> Arguments {
+    Arguments::parse()
+}
+
+#[derive(Parser)]
+pub struct Arguments {
+    /// Commit, tag, or branch to start scanning from.
+    #[arg(long, value_name = "from-revspec", default_value = "HEAD")]
+    pub from: String,
+
+    /// Optional commit, tag, or branch to stop scanning.
+    #[arg(long, value_name = "to-revspec")]
+    pub to: Option<String>,
+
+    /// Convert timestamps to UTC.
+    #[arg{long}]
+    pub utc: bool,
+
+    /// Path to the git repository.
+    #[arg(value_hint = ValueHint::DirPath, default_value = ".")]
+    pub repository_path: PathBuf,
+}

src/main.rs

···
+use anyhow::Context as _;
+use gix::Commit;
+use gix::ObjectId;
+use gix::Repository;
+use gix::bstr::BStr;
+use gix::date::Time;
+use gix::object::tree::EntryRef;
+use gix::objs::decode::Error as DecodeError;
+use gix::revision::walk::Sorting;
+use gix::traverse::commit::simple::CommitTimeOrder;
+use std::collections::HashSet;
+
+mod cli;
+
+fn main() -> anyhow::Result<()> {
+    let arguments = cli::parse();
+    let repository = gix::open(arguments.repository_path)?;
+
+    let mut current_commit = repository.resolve_revspec(&arguments.from)?;
+    let current_tree = current_commit
+        .tree()
+        .context("Failed to get tree for initial commit")?;
+
+    // Build a set of the entry file names we are interested in.
+    let mut interested: HashSet<_> = Default::default();
+    for entry in current_tree.iter() {
+        interested.insert(entry?.filename().to_owned());
+    }
+
+    let name_pad = interested
+        .iter()
+        .fold(0, |len, filename| std::cmp::max(len, filename.len()));
+
+    let mut rev_walk = repository
+        .rev_walk([current_commit.id])
+        .use_commit_graph(true)
+        .first_parent_only()
+        .sorting(Sorting::ByCommitTime(CommitTimeOrder::NewestFirst));
+
+    if let Some(boundary) = arguments.to {
+        let stop_commit = repository.resolve_revspec(&boundary)?;
+        rev_walk = rev_walk.with_boundary([stop_commit.id]);
+    }
+
+    for revision in rev_walk.all()? {
+        if interested.is_empty() {
+            break;
+        }
+
+        let revision = revision?;
+        let Some(&parent_id) = revision.parent_ids.first() else {
+            break;
+        };
+
+        let parent_commit = repository
+            .find_commit(parent_id)
+            .context("Failed to find parent commit")?;
+        let parent_tree = parent_commit
+            .tree()
+            .context("Failed to retrieve parent tree")?;
+
+        let mut scanner = EntryScanner::new(current_tree.iter(), parent_tree.iter())?;
+        while let Some(change) = scanner.next_change()? {
+            if interested.remove(change.filename()) {
+                let id = revision.id;
+                println!(
+                    "{:<name_pad$}\t{id}\t{}\t{}",
+                    change.filename().to_string(),
+                    format_ts(&current_commit.time()?, arguments.utc)?,
+                    current_commit.message()?.summary(),
+                );
+            }
+        }
+
+        current_commit = parent_commit;
+    }
+
+    Ok(())
+}
+
+struct EntryScanner<'repo, 'a, C, P> {
+    current_tree: C,
+    parent_tree: P,
+    current_entry: Option<EntryRef<'repo, 'a>>,
+    parent_entry: Option<EntryRef<'repo, 'a>>,
+}
+
+impl<'repo, 'a, C, P> EntryScanner<'repo, 'a, C, P>
+where
+    C: Iterator<Item = Result<EntryRef<'repo, 'a>, DecodeError>>,
+    P: Iterator<Item = Result<EntryRef<'repo, 'a>, DecodeError>>,
+{
+    pub fn new(current_tree: C, parent_tree: P) -> Result<Self, DecodeError> {
+        let mut this = Self {
+            current_tree,
+            parent_tree,
+            current_entry: None,
+            parent_entry: None,
+        };
+
+        this.advance_both()?;
+        Ok(this)
+    }
+
+    fn advance_current(&mut self) -> Result<Option<EntryRef<'repo, 'a>>, DecodeError> {
+        let old = self.current_entry.take();
+        self.current_entry = self.current_tree.next().transpose()?;
+        Ok(old)
+    }
+
+    fn advance_parent(&mut self) -> Result<Option<EntryRef<'repo, 'a>>, DecodeError> {
+        let old = self.parent_entry.take();
+        self.parent_entry = self.parent_tree.next().transpose()?;
+        Ok(old)
+    }
+
+    fn advance_both(
+        &mut self,
+    ) -> Result<(Option<EntryRef<'repo, 'a>>, Option<EntryRef<'repo, 'a>>), DecodeError> {
+        Ok((self.advance_current()?, self.advance_parent()?))
+    }
+
+    pub fn is_complete(&self) -> bool {
+        self.current_entry.is_none() && self.parent_entry.is_none()
+    }
+
+    /// Get the next change between the two trees.
+    pub fn next_change(&mut self) -> Result<Option<Change<'a>>, DecodeError> {
+        while !self.is_complete() {
+            match (&self.current_entry, &self.parent_entry) {
+                (None, None) => break,
+                (Some(head_entry), Some(parent_entry))
+                    if head_entry.filename() == parent_entry.filename() =>
+                {
+                    if head_entry.id() != parent_entry.id() {
+                        return Ok(self
+                            .advance_both()?
+                            .0
+                            .map(|entry| Change::Modify(entry.detach())));
+                    }
+                    self.advance_both()?;
+                    continue;
+                }
+                (Some(head_entry), Some(parent_entry)) => {
+                    if head_entry.filename() < parent_entry.filename() {
+                        return Ok(self
+                            .advance_current()?
+                            .map(|entry| Change::Create(entry.detach())));
+                    } else {
+                        return Ok(self
+                            .advance_parent()?
+                            .map(|entry| Change::Delete(entry.detach())));
+                    }
+                }
+                (Some(_), None) => {
+                    // Entry was created by the current commit.
+                    return Ok(self
+                        .advance_current()?
+                        .map(|entry| Change::Create(entry.detach())));
+                }
+                (None, Some(_)) => {
+                    // Entry was deleted by the current commit.
+                    return Ok(self
+                        .advance_parent()?
+                        .map(|entry| Change::Delete(entry.detach())));
+                }
+            }
+        }
+
+        Ok(None)
+    }
+}
+
+#[derive(Debug)]
+pub enum Change<'a> {
+    Create(gix::objs::tree::EntryRef<'a>),
+    Modify(gix::objs::tree::EntryRef<'a>),
+    Delete(gix::objs::tree::EntryRef<'a>),
+}
+
+impl<'a> Change<'a> {
+    pub fn filename(&self) -> &BStr {
+        match self {
+            Self::Create(entry) => entry.filename,
+            Self::Modify(entry) => entry.filename,
+            Self::Delete(entry) => entry.filename,
+        }
+    }
+}
+
+fn format_ts(time: &Time, utc: bool) -> anyhow::Result<String> {
+    use time::OffsetDateTime;
+    use time::UtcOffset;
+    use time::format_description::well_known::Rfc3339;
+
+    let odt = OffsetDateTime::from_unix_timestamp(time.seconds)?
+        .to_offset(UtcOffset::from_whole_seconds(time.offset)?);
+
+    let formatted = match utc {
+        true => odt.to_utc().format(&Rfc3339)?,
+        false => odt.format(&Rfc3339)?,
+    };
+
+    Ok(formatted)
+}
+
+trait ResolveRevSpec {
+    type Error;
+    /// Resolve a commit ID, reference, or symbolic reference to a [`Commit`].
+    fn resolve_revspec<'repo>(&'repo self, spec: &str) -> Result<Commit<'repo>, Self::Error>;
+}
+
+impl ResolveRevSpec for Repository {
+    type Error = anyhow::Error;
+    fn resolve_revspec<'repo>(&'repo self, spec: &str) -> Result<Commit<'repo>, Self::Error> {
+        use std::str::FromStr;
+
+        let resolved = match ObjectId::from_str(spec) {
+            Ok(id) => self
+                .find_commit(id)
+                .context("Failed to find commit in repository")?,
+            Err(_) => {
+                let id = self
+                    .find_reference(spec)
+                    .context("Failed to resolve reference in repository {}")?
+                    .into_fully_peeled_id()?;
+
+                self.find_commit(id)
+                    .context("Failed to find commit in repository")?
+            }
+        };
+
+        Ok(resolved)
+    }
+}