Meh I'll figure out submodules later

.config/nvim/pack/tree/start/nui.nvim/lua/nui/line/README.md

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+# NuiLine
+
+NuiLine is an abstraction layer on top of the following native functions:
+
+- `vim.api.nvim_buf_set_lines` (check `:h nvim_buf_set_lines()`)
+- `vim.api.nvim_buf_set_text` (check `:h nvim_buf_set_text()`)
+- `vim.api.nvim_buf_add_highlight` (check `:h nvim_buf_add_highlight()`)
+
+It helps you create line on the buffer containing multiple [`NuiText`](../text)s.
+
+_Signature:_ `NuiLine(texts?)`
+
+**Example**
+
+```lua
+local NuiLine = require("nui.line")
+
+local line = NuiLine()
+
+line:append("Something Went Wrong!", "Error")
+
+local bufnr, ns_id, linenr_start = 0, -1, 1
+
+line:render(bufnr, ns_id, linenr_start)
+```
+
+## Parameters
+
+### `texts`
+
+**Type:** `table[]`
+
+List of `NuiText` objects to set as initial texts.
+
+**Example**
+
+```lua
+local text_one = NuiText("One")
+local text_two = NuiText("Two")
+local line = NuiLine({ text_one, text_two })
+```
+
+## Methods
+
+### `line:append`
+
+_Signature:_ `line:append(content, highlight?)`
+
+Adds a chunk of content to the line.
+
+**Parameters**
+
+| Name        | Type                             | Description           |
+| ----------- | -------------------------------- | --------------------- |
+| `content`   | `string` / `NuiText` / `NuiLine` | content               |
+| `highlight` | `string` or `table`              | highlight information |
+
+If `text` is `string`, these parameters are passed to `NuiText`
+and a `NuiText` object is returned.
+
+It `content` is a `NuiText`/`NuiLine` object, it is returned unchanged.
+
+### `line:content`
+
+_Signature:_ `line:content()`
+
+Returns the line content.
+
+### `line:highlight`
+
+_Signature:_ `line:highlight(bufnr, ns_id, linenr)`
+
+Applies highlight for the line.
+
+**Parameters**
+
+| Name     | Type     | Description                                    |
+| -------- | -------- | ---------------------------------------------- |
+| `bufnr`  | `number` | buffer number                                  |
+| `ns_id`  | `number` | namespace id (use `-1` for fallback namespace) |
+| `linenr` | `number` | line number (1-indexed)                        |
+
+### `line:render`
+
+_Signature:_ `line:render(bufnr, ns_id, linenr_start, linenr_end?)`
+
+Sets the line on buffer and applies highlight.
+
+**Parameters**
+
+| Name           | Type     | Description                                    |
+| -------------- | -------- | ---------------------------------------------- |
+| `bufnr`        | `number` | buffer number                                  |
+| `ns_id`        | `number` | namespace id (use `-1` for fallback namespace) |
+| `linenr_start` | `number` | start line number (1-indexed)                  |
+| `linenr_end`   | `number` | end line number (1-indexed)                    |
+
+## Wiki Page
+
+You can find additional documentation/examples/guides/tips-n-tricks in [nui.line wiki page](https://github.com/MunifTanjim/nui.nvim/wiki/nui.line).

.config/nvim/pack/tree/start/nui.nvim/lua/nui/line/init.lua

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+local Object = require("nui.object")
+local NuiText = require("nui.text")
+local defaults = require("nui.utils").defaults
+
+---@class NuiLine
+---@field _texts NuiText[]
+local Line = Object("NuiLine")
+
+---@param texts? NuiText[]
+function Line:init(texts)
+  self._texts = defaults(texts, {})
+end
+
+---@param content string|NuiText|NuiLine
+---@param highlight? string|nui_text_extmark data for highlight
+---@return NuiText|NuiLine
+function Line:append(content, highlight)
+  local block = content
+  if type(block) == "string" then
+    block = NuiText(block, highlight)
+  end
+  if block._texts then
+    ---@cast block NuiLine
+    for _, text in ipairs(block._texts) do
+      table.insert(self._texts, text)
+    end
+  else
+    ---@cast block NuiText
+    table.insert(self._texts, block)
+  end
+  return block
+end
+
+---@return string
+function Line:content()
+  return table.concat(vim.tbl_map(function(text)
+    return text:content()
+  end, self._texts))
+end
+
+---@return number
+function Line:width()
+  local width = 0
+  for _, text in ipairs(self._texts) do
+    width = width + text:width()
+  end
+  return width
+end
+
+---@param bufnr number buffer number
+---@param ns_id number namespace id
+---@param linenr number line number (1-indexed)
+---@param ___byte_start___? integer start byte position (0-indexed)
+---@return nil
+function Line:highlight(bufnr, ns_id, linenr, ___byte_start___)
+  local current_byte_start = ___byte_start___ or 0
+  for _, text in ipairs(self._texts) do
+    text:highlight(bufnr, ns_id, linenr, current_byte_start)
+    current_byte_start = current_byte_start + text:length()
+  end
+end
+
+---@param bufnr number buffer number
+---@param ns_id number namespace id
+---@param linenr_start number start line number (1-indexed)
+---@param linenr_end? number end line number (1-indexed)
+---@return nil
+function Line:render(bufnr, ns_id, linenr_start, linenr_end)
+  local row_start = linenr_start - 1
+  local row_end = linenr_end and linenr_end - 1 or row_start + 1
+  local content = self:content()
+  vim.api.nvim_buf_set_lines(bufnr, row_start, row_end, false, { content })
+  self:highlight(bufnr, ns_id, linenr_start)
+end
+
+---@alias NuiLine.constructor fun(texts?: NuiText[]): NuiLine
+---@type NuiLine|NuiLine.constructor
+local NuiLine = Line
+
+return NuiLine