feat: initial implementation

lua/opencode.lua

@@ -0,0 +1,60 @@
+local M = {}
+
+local state = {
+  buf = nil,
+  win = nil,
+  job = nil,
+}
+
+local function is_valid_window(win)
+  return win and vim.api.nvim_win_is_valid(win)
+end
+
+local function is_valid_buffer(buf)
+  return buf and vim.api.nvim_buf_is_valid(buf)
+end
+
+local function open_side_window()
+  vim.cmd("botright vertical 80new")
+  state.win = vim.api.nvim_get_current_win()
+end
+
+local function start_terminal()
+  state.buf = vim.api.nvim_create_buf(false, true)
+  vim.api.nvim_set_option_value("bufhidden", "hide", { buf = state.buf })
+  vim.api.nvim_set_option_value("filetype", "opencode", { buf = state.buf })
+  vim.api.nvim_buf_set_name(state.buf, "opencode")
+
+  vim.api.nvim_win_set_buf(state.win, state.buf)
+  state.job = vim.fn.termopen("opencode", {
+    on_exit = function()
+      state.job = nil
+    end,
+  })
+end
+
+function M.toggle()
+  if is_valid_window(state.win) then
+    vim.api.nvim_win_close(state.win, false)
+    state.win = nil
+    return
+  end
+
+  open_side_window()
+
+  if is_valid_buffer(state.buf) then
+    vim.api.nvim_win_set_buf(state.win, state.buf)
+  else
+    start_terminal()
+  end
+
+  vim.cmd("startinsert")
+end
+
+function M.setup()
+  vim.api.nvim_create_user_command("OpenCodeToggle", function()
+    M.toggle()
+  end, {})
+end
+
+return M