feat: lazy view

lua/lazy/view/text.lua

@@ -0,0 +1,86 @@
+---@alias TextString {str: string, hl?:string, extmark?:table}
+---@alias TextLine TextString[]
+
+---@class Text
+---@field _lines TextLine[]
+local Text = {}
+
+function Text.new()
+  local self = setmetatable({}, {
+    __index = Text,
+  })
+  self._lines = {}
+
+  return self
+end
+
+---@param str string
+---@param hl string|table
+function Text:append(str, hl)
+  if #self._lines == 0 then
+    self:nl()
+  end
+
+  table.insert(self._lines[#self._lines], {
+    str = str,
+    hl = type(hl) == "string" and hl or nil,
+    extmark = type(hl) == "table" and hl or nil,
+  })
+
+  return self
+end
+
+function Text:nl()
+  table.insert(self._lines, {})
+  return self
+end
+
+function Text:render(buf, padding)
+  padding = padding or 0
+  local lines = {}
+
+  for _, line in ipairs(self._lines) do
+    local str = (" "):rep(padding)
+
+    for _, segment in ipairs(line) do
+      str = str .. segment.str
+    end
+
+    table.insert(lines, str)
+  end
+
+  vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+
+  for l, line in ipairs(self._lines) do
+    local col = padding
+
+    for _, segment in ipairs(line) do
+      local width = vim.fn.strlen(segment.str)
+
+      if segment.hl then
+        vim.api.nvim_buf_set_extmark(buf, Config.ns, l - 1, col, {
+          hl_group = segment.hl,
+          end_col = col + width,
+        })
+      end
+
+      if segment.extmark then
+        vim.api.nvim_buf_set_extmark(buf, Config.ns, l - 1, col, segment.extmark)
+      end
+
+      col = col + width
+    end
+  end
+end
+
+function Text:trim()
+  while #self._lines > 0 and #self._lines[1] == 0 do
+    table.remove(self._lines, 1)
+  end
+
+  while #self._lines > 0 and #self._lines[#self._lines] == 0 do
+    table.remove(self._lines)
+  end
+end
+
+return Text