added git update index

src/git/command.rs

@@ -0,0 +1,21 @@
+use std::process::Command;
+
+use crate::config::parse::GLOBAL_CONNECTION_PATH;
+
+pub fn toggle_index(start: bool) -> Result<(), Box<dyn std::error::Error>> {
+    let change: &str = match start {
+        true => "--assume-unchanged",
+        false => "--no-assume-unchanged",
+    };
+    Command::new("git")
+        .args(["update-index", change, "conf/global/connections.env"])
+        .status()?;
+
+    if !start {
+        Command::new("git")
+            .args(["checkout", GLOBAL_CONNECTION_PATH])
+            .status()?;
+    }
+
+    Ok(())
+}