feat: Add multiline input for repl

lua/dap.lua

@@ -166,6 +166,7 @@ local DAP_QUICKFIX_CONTEXT = DAP_QUICKFIX_TITLE
 ---@field options nil|AdapterOptions
 ---@field enrich_config? fun(config: Configuration, on_config: fun(config: Configuration))
 ---@field reverse_request_handlers? table<string, fun(session: Session, request: dap.Request)>
+---@field is_multiline? fun(current_inputs: string[]): boolean
 
 ---@class AdapterOptions
 ---@field initialize_timeout_sec nil|number

lua/dap/repl.lua

@@ -16,7 +16,31 @@ local function get_session()
   return require('dap').session()
 end
 
+local repl
 local execute  -- required for forward reference
+local function execute_current(opts)
+  local current_text = api.nvim_buf_get_lines(repl.buf, -2, -1, false)[1]
+  local prompt_length = #vim.fn.prompt_getprompt(repl.buf)
+  execute(string.sub(current_text, prompt_length + 1), opts)
+end
+
+
+local MULTILINE_INPUT = 'MULTILINE_INPUT'
+
+---@param buf number
+---@return string[]
+local function get_multiline_input(buf)
+  return vim.b[buf][MULTILINE_INPUT] or {}
+end
+
+local function get_prompt(buf)
+  buf = buf or repl.buf
+  if #get_multiline_input(buf) == 0 then
+    return 'dap> '
+  else
+    return '...> '
+  end
+end
 
 
 local function new_buf()
@@ -34,7 +58,11 @@ local function new_buf()
   api.nvim_buf_set_keymap(buf, 'n', 'o', "<Cmd>lua require('dap.ui').trigger_actions()<CR>", {})
   api.nvim_buf_set_keymap(buf, 'i', '<up>', "<Cmd>lua require('dap.repl').on_up()<CR>", {})
   api.nvim_buf_set_keymap(buf, 'i', '<down>', "<Cmd>lua require('dap.repl').on_down()<CR>", {})
-  vim.fn.prompt_setprompt(buf, 'dap> ')
+
+  -- CR keybindings may require additional configuration for some terminals, see https://stackoverflow.com/a/42461580
+  vim.keymap.set('i', '<S-CR>', function() execute_current({force_multiline = true}) end, {buffer = buf})
+  vim.keymap.set('i', '<C-CR>', function() execute_current({force_finish =  true}) end, {buffer = buf})
+  vim.fn.prompt_setprompt(buf, get_prompt(buf))
   vim.fn.prompt_setcallback(buf, execute)
   if vim.fn.has('nvim-0.7') == 1 then
     vim.keymap.set('n', 'G', function()
@@ -67,7 +95,7 @@ local function new_win(buf, winopts, wincmd)
   return win
 end
 
-local repl = ui.new_view(
+repl = ui.new_view(
   new_buf,
   new_win, {
     before_open = function()
@@ -212,7 +240,34 @@ local function print_threads(threads)
 end
 
 
-function execute(text)
+---@return string|nil full_input nil if input is incomplete
+local function handle_multiline_input(last_line, force_multiline, force_finish)
+  local session = get_session()
+  if not session then
+    return last_line
+  end
+  local current_inputs = get_multiline_input(repl.buf)
+  table.insert(current_inputs, last_line)
+  local is_multiline = session.adapter.is_multiline
+  if not force_finish and (force_multiline or (is_multiline and is_multiline(current_inputs))) then
+    vim.b[repl.buf][MULTILINE_INPUT] = current_inputs
+    if #current_inputs == 1 then
+      vim.fn.prompt_setprompt(repl.buf, get_prompt())
+    end
+    return nil
+  end
+  vim.b[repl.buf][MULTILINE_INPUT] = nil
+  vim.fn.prompt_setprompt(repl.buf, get_prompt())
+  return table.concat(current_inputs, '\n')
+end
+
+function execute(text, opts)
+  opts = opts or {}
+  text = handle_multiline_input(text, opts.force_multiline, opts.force_finish)
+  if text == nil then
+    return
+  end
+
   if text == '' then
     if history.last then
       text = history.last
@@ -337,9 +392,9 @@ local function select_history(delta)
     history.idx = 1
   end
   local text = history.entries[history.idx]
-  if text then
+  if text and string.find(text, '\n') == nil then
     local lnum = vim.fn.line('$')
-    api.nvim_buf_set_lines(repl.buf, lnum - 1, lnum, true, {'dap> ' .. text })
+    api.nvim_buf_set_lines(repl.buf, lnum - 1, lnum, true, {get_prompt() .. text })
     vim.fn.setcursorcharpos({ lnum, vim.fn.col('$') })  -- move cursor to the end of line
   end
 end
@@ -439,7 +494,7 @@ do
     local session = get_session()
     local col = api.nvim_win_get_cursor(0)[2]
     local line = api.nvim_get_current_line()
-    local offset = vim.startswith(line, 'dap> ') and 5 or 0
+    local offset = vim.startswith(line, get_prompt()) and 5 or 0
     local line_to_cursor = line:sub(offset + 1, col)
     local text_match = vim.fn.match(line_to_cursor, '\\k*$')
     if vim.startswith(line_to_cursor, '.') or base ~= '' then