fix: fix typo and add debug print option

lua/Trans/core/buffer.lua

@@ -106,7 +106,7 @@ end
 function buffer:add_highlight(linenr, hl_group, col_start, col_end, ns)
     -- vim.print(linenr, hl_group, col_start, col_end, ns)
     main_loop(function()
-        linenr = linenr - 1 or -1
+        linenr = linenr - 1
         col_start = col_start or 0
         api.nvim_buf_add_highlight(self.bufnr, ns or -1, hl_group, linenr, col_start, col_end or -1)
     end)
@@ -159,7 +159,7 @@ buffer.__index = function(self, key)
     if res then
         return res
     elseif type(key) == 'number' then
-        -- return fn.getbufoneline(self.bufnr, key) -- Vimscript Function Or Lua API ?? -- INFO :v0.8.1 doesn't support getbufoneline
+        -- return fn.getbufoneline(self.bufnr, key) -- Vimscript Function Or Lua API ?? -- INFO :only work on neovim-nightly
         return api.nvim_buf_get_lines(self.bufnr, key - 1, key, true)[1]
     else
         error('invalid key: ' .. key)

lua/Trans/core/conf.lua

@@ -16,6 +16,7 @@ return {
     ---@type string the directory for database file and password file
     dir      = os.getenv('HOME') .. '/.vim/dict',
     query    = 'fallback',
+    debug    = true,
     -- backend_order = {},
     ---@type 'default' | 'dracula' | 'tokyonight' global Trans theme [see lua/Trans/style/theme.lua]
     theme    = 'default', -- default | tokyonight | dracula
@@ -102,11 +103,11 @@ return {
                 no          = '', -- ❌ | ❎ | ✖ | ✘ | ✗ |
                 cell        = '■', -- ■  | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
                 web         = '󰖟', --🌍 | 🌎 | 🌏 | 🌐 |
-                tag         = ' ',
+                tag         = '',
                 pos         = '',
                 translation = '󰊿',
                 definition  = '󰗊',
-                exchange    = '✳',
+                exchange    = '',
             },
         },
     },

lua/Trans/core/util.lua

@@ -143,6 +143,43 @@ function M.main_loop(func)
     coroutine.yield()
 end
 
+---Split text into paragraphs
+---@param lines string[] text to be split
+---@return string[][] paragraphs
+function M.split_to_paragraphs(lines, opts)
+    --- TODO :More options and better algorithm to detect paragraphs
+    opts = opts or {}
+    local paragraphs = {}
+    local paragraph = {}
+    for _, line in ipairs(lines) do
+        if line == '' then
+            paragraphs[#paragraphs + 1] = paragraph
+            paragraph = {}
+        else
+            paragraph[#paragraph + 1] = line
+        end
+    end
+    return paragraphs
+end
+
+---Get visible lines in the window or current window
+---@param opts { winid: integer, height: integer }?
+---@return string[]
+function M.visible_lines(opts)
+    opts = opts or {}
+
+    -- INFO : don't calculate the height of statusline and cmdheight or winbar?
+    local winid                 = opts.winid or 0
+    local win_height            = opts.height or api.nvim_win_get_height(winid)
+    local current_line          = api.nvim_win_get_cursor(winid)[1]
+    local current_relative_line = vim.fn.winline()
+
+
+    local _start = current_line - current_relative_line
+    local _end   = _start + win_height - vim.o.cmdheight --[[ - 1 -- maybe 1 for statusline?? ]]
+
+    return api.nvim_buf_get_lines(0, _start, _end, false)
+end
 
 ---@class Trans
 ---@field util TransUtil

lua/Trans/core/window.lua

@@ -1,4 +1,5 @@
 local api = vim.api
+---@class Trans
 local Trans = require("Trans")
 
 ---@class TransWindow
@@ -110,6 +111,7 @@ function window:resize(opts)
     end
 end
 
+
 ---Try to close window with animation?
 function window:try_close()
     local close_animation = self.animation.close