Add recursive search feature, and skip sort feature

Add recursive search feature, and add skip sort feature (reliant on the
former). Add unit tests for both features. Add AUR PKGBUILD GitHub
repository to the README. Add Results and TableWrapper structs, along
will all relevant methods and fucntions. Add Make targets for installing
locally, and testing the recursive feature. Switch to object-driven
harness, rather than a large parent function. Move "walk_dir" logic to a
Results method. Use "expect" instead of unnecessary match blocks. Remove
leftover FIXME comments for recursive search ideas. There is a lot of
potential for optimization here, but this is the first pass.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..0e097e6
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,17 @@
+/*
+ * gfold
+ * https://github.com/nickgerace/gfold
+ * Author: Nick Gerace
+ * License: Apache 2.0
+ */
+
+use git2::Repository;
+
+use std::path::Path;
+
+pub fn is_git_repo(target: &Path) -> bool {
+    match Repository::open(target) {
+        Ok(_) => true,
+        Err(_) => false,
+    }
+}