feat: add simple script for managing terminals

plugin/geterm.lua

@@ -0,0 +1,33 @@
+---@class TermBuf
+---@field buf_id integer
+---@field term_id integer
+
+---@type table<number, TermBuf>
+local state = {}
+
+---@param n integer
+local function get_or_create_term(n)
+    if state[n] ~= nil then
+        vim.api.nvim_win_set_buf(0, state[n].buf_id)
+        return
+    end
+
+    vim.cmd.terminal()
+    local buf_id = vim.api.nvim_get_current_buf()
+    local term_id = vim.b.terminal_job_id
+    vim.cmd.startinsert()
+
+    state[n] = { buf_id = buf_id, term_id = term_id }
+end
+
+---@param f function
+local function count_fn(f)
+    local function wrap(...)
+        local count = vim.v.count
+        return f(count, arg)
+    end
+
+    return wrap
+end
+
+vim.keymap.set("n", "<leader>tn", count_fn(get_or_create_term))