1 files changed, 112 insertions, 0 deletions
diff --git a/crates/divina_git/src/lib.rs b/crates/divina_git/src/lib.rs
new file mode 100644
index 0000000..e73623f
--- /dev/null
+++ b/crates/divina_git/src/lib.rs
@@ -0,0 +1,112 @@
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+//! Much help from:
+//!
+//! - <https://github.com/rust-lang/git2-rs/blob/master/examples/clone.rs>
+
+#![deny(
+  warnings,
+  nonstandard_style,
+  unused,
+  future_incompatible,
+  rust_2018_idioms,
+  unsafe_code
+)]
+#![deny(clippy::all, clippy::nursery, clippy::pedantic)]
+#![recursion_limit = "128"]
+#![doc(
+  html_logo_url = "https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/twitter/282/ribbon_1f380.png",
+  html_favicon_url = "https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/twitter/282/ribbon_1f380.png"
+)]
+
+use std::{io::Write, path};
+
+struct State {
+  progress: Option<git2::Progress<'static>>,
+  total:    usize,
+  current:  usize,
+  path:     Option<path::PathBuf>,
+  newline:  bool,
+}
+
+fn print(state: &mut State) {
+  let git_stats = state.progress.as_ref().unwrap();
+  let network_pct = (100 * git_stats.received_objects()) / git_stats.total_objects();
+  let index_pct = (100 * git_stats.indexed_objects()) / git_stats.total_objects();
+  let co_pct = if state.total > 0 {
+    (100 * state.current) / state.total
+  } else {
+    0
+  };
+  let kbytes = git_stats.received_bytes() / 1024;
+  if git_stats.received_objects() == git_stats.total_objects() {
+    if !state.newline {
+      println!();
+      state.newline = true;
+    }
+    print!(
+      "Resolving deltas {}/{}\r",
+      git_stats.indexed_deltas(),
+      git_stats.total_deltas()
+    );
+  } else {
+    print!(
+      "net {:3}% ({:4} kb, {:5}/{:5})  /  idx {:3}% ({:5}/{:5})  /  chk {:3}% ({:4}/{:4}) {}\r",
+      network_pct,
+      kbytes,
+      git_stats.received_objects(),
+      git_stats.total_objects(),
+      index_pct,
+      git_stats.indexed_objects(),
+      git_stats.total_objects(),
+      co_pct,
+      state.current,
+      state.total,
+      state
+        .path
+        .as_ref()
+        .map(|s| s.to_string_lossy().into_owned())
+        .unwrap_or_default()
+    );
+  }
+  std::io::stdout().flush().unwrap();
+}
+
+/// # Errors
+/// never
+pub fn clone(url: &str, path: &str) -> Result<(), git2::Error> {
+  let state = std::cell::RefCell::new(State {
+    progress: None,
+    total:    0,
+    current:  0,
+    path:     None,
+    newline:  false,
+  });
+  let mut cb = git2::RemoteCallbacks::new();
+  cb.transfer_progress(|stats| {
+    let mut state = state.borrow_mut();
+    state.progress = Some(stats.to_owned());
+    print(&mut *state);
+    true
+  });
+
+  let mut co = git2::build::CheckoutBuilder::new();
+  co.progress(|path, cur, total| {
+    let mut state = state.borrow_mut();
+    state.path = path.map(path::Path::to_path_buf);
+    state.current = cur;
+    state.total = total;
+    print(&mut *state);
+  });
+
+  let mut fo = git2::FetchOptions::new();
+  fo.remote_callbacks(cb);
+  git2::build::RepoBuilder::new()
+    .fetch_options(fo)
+    .with_checkout(co)
+    .clone(url, path::Path::new(path))?;
+  println!();
+
+  Ok(())
+}