1 files changed, 52 insertions, 0 deletions
diff --git a/src/core.rs b/src/core.rs
new file mode 100644
index 0000000..1223bb7
--- /dev/null
+++ b/src/core.rs
@@ -0,0 +1,52 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::process;
+use ini::ini;
+
+pub struct GitRepository {
+    pub worktree: PathBuf,
+    gitdir: PathBuf,
+    conf: HashMap<String, HashMap<String, Option<String>>>
+}
+
+fn die(msg: &str) {
+    println!("{}", msg);
+    process::exit(1);
+}
+
+impl GitRepository {
+    pub fn new(worktree: PathBuf) -> Self {
+        let gitdir = worktree.join(".git");
+        let conf: HashMap<String, HashMap<String, Option<String>>> = HashMap::new();
+        Self { worktree, gitdir, conf }
+    }
+
+    pub fn from_dir(worktree: PathBuf) -> Self {
+        if !worktree.exists() {
+            die("Worktree does not exist");
+        }
+        let gitdir = worktree.join(".git");
+        if !gitdir.exists() {
+            die("Not a valid git repository");
+        }
+        let conf_file = gitdir.join("config");
+        if !conf_file.exists() {
+            die("Config file does not exist");
+        }
+        let conf = ini!(conf_file.to_str().unwrap());
+        let repo_format_version = conf["core"]["repositoryformatversion"].clone();
+        if let Some(version) = repo_format_version {
+            if version != "0" {
+                die("Unsupported format version");
+            }
+        } else {
+            die("Could not determine repository format version");
+        }
+        
+        Self {
+            worktree,
+            gitdir,
+            conf
+        }
+    }
+}
+\ No newline at end of file