1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/git2/examples/rev-parse.rs b/vendor/git2/examples/rev-parse.rs
new file mode 100644
index 000000000..a465f15a4
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+++ b/vendor/git2/examples/rev-parse.rs
@@ -0,0 +1,60 @@
+/*
+ * libgit2 "rev-parse" example - shows how to parse revspecs
+ *
+ * Written by the libgit2 contributors
+ *
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication along
+ * with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#![deny(warnings)]
+
+use git2::Repository;
+use structopt::StructOpt;
+
+#[derive(StructOpt)]
+struct Args {
+    #[structopt(name = "spec")]
+    arg_spec: String,
+    #[structopt(name = "dir", long = "git-dir")]
+    /// directory of the git repository to check
+    flag_git_dir: Option<String>,
+}
+
+fn run(args: &Args) -> Result<(), git2::Error> {
+    let path = args.flag_git_dir.as_ref().map(|s| &s[..]).unwrap_or(".");
+    let repo = Repository::open(path)?;
+
+    let revspec = repo.revparse(&args.arg_spec)?;
+
+    if revspec.mode().contains(git2::RevparseMode::SINGLE) {
+        println!("{}", revspec.from().unwrap().id());
+    } else if revspec.mode().contains(git2::RevparseMode::RANGE) {
+        let to = revspec.to().unwrap();
+        let from = revspec.from().unwrap();
+        println!("{}", to.id());
+
+        if revspec.mode().contains(git2::RevparseMode::MERGE_BASE) {
+            let base = repo.merge_base(from.id(), to.id())?;
+            println!("{}", base);
+        }
+
+        println!("^{}", from.id());
+    } else {
+        return Err(git2::Error::from_str("invalid results from revparse"));
+    }
+    Ok(())
+}
+
+fn main() {
+    let args = Args::from_args();
+    match run(&args) {
+        Ok(()) => {}
+        Err(e) => println!("error: {}", e),
+    }
+}