nu: Add git sha command

tree/.local/nu/git.nu

@@ -18,3 +18,26 @@ def gitfixremote [
 		print $"Unknown host: ($parsed.host)"
 	}
 }
+
+def "git sha" [
+	--no-copy(-c), # don't copy to clipboard
+	--full(-f),    # output the complete sha
+]: nothing -> record {
+	mut sha = (git show -q | lines |  parse "commit {sha}" | first);
+
+	if ($sha | is-empty) {
+		return;
+	}
+
+	$sha = $sha.sha
+
+	if not $full {
+		$sha = ($sha | str substring 0..7)
+	}
+
+	if not $no_copy {
+		$sha | pbc
+	}
+
+	$sha
+}