initial commit

1 files changed, 20 insertions, 0 deletions

diff --git a/runtime/lua/core/modes.lua b/runtime/lua/core/modes.lua
new file mode 100644
index 0000000..c0cb751
--- /dev/null
+++ b/runtime/lua/core/modes.lua
@@ -0,0 +1,20 @@
+local M = {}
+
+function M.set_mode(state, mode_name)
+  if mode_name ~= "normal" and mode_name ~= "insert" then
+    return false, "unknown mode: " .. tostring(mode_name)
+  end
+
+  state.mode = mode_name
+  return true
+end
+
+function M.is_insert(state)
+  return state.mode == "insert"
+end
+
+function M.is_normal(state)
+  return state.mode == "normal"
+end
+
+return M