diff --git a/lua/ow/dap/hover.lua b/lua/ow/dap/hover.lua
new file mode 100644
index 0000000..8c0d773
--- /dev/null
+++ b/lua/ow/dap/hover.lua
@@ -0,0 +1,314 @@
+-- DAP hover implementation with tree-based display
+local Item = require("ow.dap.item")
+local Tree = require("ow.dap.hover.tree")
+local log = require("ow.log")
+
+---@class ow.dap.hover.Window
+---@field current_win? integer Currently active hover window ID
+---@field ns_id integer Namespace for extmarks
+---@field tree ow.dap.hover.Tree? Current tree formatter
+local Window = {}
+
+Window.MAX_WIDTH = nil
+Window.MAX_HEIGHT = nil
+Window.ns_id = vim.api.nvim_create_namespace("ow.dap.hover")
+
+---Close any existing hover window
+function Window.close()
+    if Window.current_win and vim.api.nvim_win_is_valid(Window.current_win) then
+        vim.api.nvim_win_close(Window.current_win, true)
+    end
+    Window.current_win = nil
+    Window.tree = nil
+end
+
+---@param lines string[]
+---@return integer
+function Window.compute_width(lines)
+    local max_width = 1
+    for _, line in ipairs(lines) do
+        if Window.MAX_WIDTH and #line >= Window.MAX_WIDTH then
+            max_width = Window.MAX_WIDTH
+            break
+        end
+        max_width = math.max(max_width, #line)
+    end
+
+    return max_width
+end
+
+---Create and display hover window with tree content
+---@param session dap.Session
+---@param item ow.dap.Item
+---@param lines string[]
+---@param content ow.dap.hover.Content
+function Window.show(session, item, lines, content)
+    -- Create buffer
+    local orig_buf = vim.api.nvim_get_current_buf()
+    local buf = vim.api.nvim_create_buf(false, true)
+    vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+
+    -- Create window (initially hidden for size calculation)
+    local win = vim.api.nvim_open_win(buf, false, {
+        relative = "cursor",
+        width = Window.compute_width(lines),
+        height = 1,
+        row = 1,
+        col = 0,
+        border = "rounded",
+        style = "minimal",
+        hide = true,
+    })
+
+    -- Calculate and apply final height
+    local text_height = vim.api.nvim_win_text_height(win, {}).all
+    vim.api.nvim_win_set_config(win, {
+        height = math.min(Window.MAX_HEIGHT or text_height, text_height),
+        hide = false,
+    })
+
+    -- Apply syntax highlighting
+    content:apply_highlights(Window.ns_id, buf)
+
+    -- Store window reference
+    Window.current_win = win
+
+    -- Set up auto-close behavior
+    vim.api.nvim_create_autocmd({ "CursorMoved", "InsertEnter" }, {
+        buffer = orig_buf,
+        once = true,
+        callback = Window.close,
+    })
+
+    vim.api.nvim_create_autocmd("WinLeave", {
+        buffer = buf,
+        once = true,
+        callback = Window.close,
+    })
+
+    -- Set up expansion keymaps
+    vim.keymap.set("n", "<CR>", function()
+        Window.expand_at_cursor(buf)
+    end, { buffer = buf, nowait = true })
+
+    vim.keymap.set("n", "<Tab>", function()
+        Window.expand_at_cursor(buf)
+    end, { buffer = buf, nowait = true })
+end
+
+---Expand/collapse item at cursor position
+---@param buf integer
+function Window.expand_at_cursor(buf)
+    if not Window.tree then
+        return
+    end
+
+    -- Re-render the tree
+    coroutine.wrap(function()
+        local ok, err = xpcall(function()
+            -- Toggle expansion
+            local cursor = vim.api.nvim_win_get_cursor(Window.current_win)
+            local success = Window.tree:toggle_at_line(cursor[1] - 1)
+            if not success then
+                return
+            end
+
+            local content = Window.tree:render()
+            local lines = content:get_lines()
+
+            -- TODO: possible to only update the affected lines?
+            -- Update buffer content
+            vim.api.nvim_set_option_value(
+                "scrolloff",
+                0,
+                { win = Window.current_win }
+            )
+            vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+            vim.api.nvim_set_option_value(
+                "scrolloff",
+                vim.o.scrolloff,
+                { win = Window.current_win }
+            )
+
+            -- Re-apply highlights
+            vim.api.nvim_buf_clear_namespace(buf, -1, 0, -1) -- Clear old highlights
+            content:apply_highlights(Window.ns_id, buf)
+
+            -- Adjust window size
+            vim.api.nvim_win_set_config(Window.current_win, {
+                width = Window.compute_width(lines),
+            })
+            local text_height =
+                vim.api.nvim_win_text_height(Window.current_win, {}).all
+            vim.api.nvim_win_set_config(Window.current_win, {
+                height = math.min(
+                    Window.MAX_HEIGHT or text_height,
+                    text_height
+                ),
+            })
+        end, debug.traceback)
+
+        if not ok then
+            log.error("Expansion failed:\n%s", err)
+        end
+    end)()
+end
+
+---Main hover entry point (async)
+---@async
+---@param expr string Expression to evaluate
+---@param session dap.Session DAP session
+---@param frame_id number Current frame ID
+---@param line_nr integer Line number for context
+---@param col_nr integer Column number for context
+---@param current_file string Current file path
+local function hover_eval(
+    expr,
+    session,
+    frame_id,
+    line_nr,
+    col_nr,
+    current_file
+)
+    -- Close existing hover window
+    Window.close()
+
+    -- Evaluate expression
+    local eval_request = {
+        expression = expr,
+        frameId = frame_id,
+        context = "hover",
+        line = line_nr,
+        column = col_nr,
+        source = {
+            path = current_file,
+        },
+    }
+
+    local err, resp = session:request("evaluate", eval_request)
+    if err or not resp then
+        log.warning("Failed to evaluate '%s': %s", expr, err)
+        return
+    end
+
+    -- Create item and tree formatter
+    local item =
+        Item.new(expr, resp.type, resp.result, resp.variablesReference, 0)
+    local tree = Tree.new(session)
+
+    -- Build and render tree
+    tree:build(item)
+    local content = tree:render()
+    local lines = content:get_lines()
+
+    -- Store formatter for expansion
+    Window.tree = tree
+
+    -- Show hover window
+    Window.show(session, item, lines, content)
+end
+
+---Public hover function
+local function hover_async()
+    -- Check if hover window is already open - focus it instead
+    if Window.current_win and vim.api.nvim_win_is_valid(Window.current_win) then
+        vim.api.nvim_set_current_win(Window.current_win)
+        return
+    end
+
+    local dap = require("dap")
+    local session = dap.session()
+    if not session then
+        return
+    end
+
+    local capabilities = session.capabilities or {}
+    local supports_hover = capabilities.supportsEvaluateForHovers
+    if not supports_hover then
+        log.warning("Hover is not supported by this adapter")
+        return
+    end
+
+    local cursor_pos = vim.api.nvim_win_get_cursor(0)
+    local line_nr = cursor_pos[1] -- nvim-dap sets linesStartAt1=true
+    local col_nr = cursor_pos[2] + 1 -- nvim-dap sets columnsStartAt1=true
+    local current_file = vim.api.nvim_buf_get_name(0)
+
+    -- Get expression under cursor
+    local expr
+    local mode = vim.api.nvim_get_mode()
+    if mode.mode == "v" then
+        -- Visual mode selection
+        local start_pos = vim.fn.getpos("v")
+        local end_pos = vim.fn.getpos(".")
+
+        local start_row, start_col = start_pos[2], start_pos[3]
+        local end_row, end_col = end_pos[2], end_pos[3]
+
+        if start_row == end_row and end_col < start_col then
+            start_col, end_col = end_col, start_col
+        elseif end_row < start_row then
+            start_row, end_row = end_row, start_row
+            start_col, end_col = end_col, start_col
+        end
+
+        local lines = vim.api.nvim_buf_get_text(
+            0,
+            start_row - 1,
+            start_col - 1,
+            end_row - 1,
+            end_col,
+            {}
+        )
+        expr = table.concat(lines, "\n")
+
+        vim.api.nvim_feedkeys(
+            vim.api.nvim_replace_termcodes("<ESC>", true, false, true),
+            "n",
+            false
+        )
+    else
+        expr = vim.fn.expand("<cexpr>")
+    end
+
+    if expr == "" then
+        return
+    end
+
+    -- Get thread and frame information
+    local thread_id
+    do
+        local err, resp = session:request("threads", nil)
+        if err or not resp or #resp.threads == 0 then
+            log.warning("Failed to get threads: %s", err)
+            return
+        end
+        thread_id = resp.threads[1].id
+    end
+
+    local frame_id
+    do
+        local err, resp =
+            session:request("stackTrace", { threadId = thread_id })
+        if err or not resp or #resp.stackFrames == 0 then
+            log.warning("Failed to get stack trace: %s", err)
+            return
+        end
+        frame_id = resp.stackFrames[1].id
+    end
+
+    -- Evaluate and display hover
+    hover_eval(expr, session, frame_id, line_nr, col_nr, current_file)
+end
+
+---Wrapped hover function with error handling
+local function hover()
+    coroutine.wrap(function()
+        local ok, err = xpcall(hover_async, debug.traceback)
+        if not ok then
+            log.error("Hover failed:\n%s", err)
+        end
+    end)()
+end
+
+return hover
diff --git a/lua/ow/dap/hover/content.lua b/lua/ow/dap/hover/content.lua
new file mode 100644
index 0000000..292ae4f
--- /dev/null
+++ b/lua/ow/dap/hover/content.lua
@@ -0,0 +1,146 @@
+-- Highlighted text content builder for DAP tree display
+local log = require("ow.log")
+---@class ow.dap.hover.content.Capture
+---@field start_col integer
+---@field end_col integer
+---@field text string
+---@field group string
+---@field priority integer
+
+---@class ow.dap.hover.Highlight
+---@field group string Highlight group name
+---@field start_col integer Start column (0-indexed)
+---@field end_col integer End column (0-indexed)
+
+---@class ow.dap.hover.Content
+---@field text string The complete text content
+---@field highlights ow.dap.hover.Highlight[] List of highlights to apply
+---@field _current_col integer Current column position (for building)
+local Content = {}
+Content.__index = Content
+
+---Create new highlighted content
+---@return ow.dap.hover.Content
+function Content.new()
+    return setmetatable({
+        text = "",
+        highlights = {},
+        _current_col = 0,
+    }, Content)
+end
+
+---Add text with optional highlighting
+---@param text string Text to add
+---@param highlight_group? string Optional highlight group
+function Content:add(text, highlight_group)
+    local start_col = self._current_col
+    local end_col = start_col + #text
+
+    self.text = self.text .. text
+    self._current_col = end_col
+
+    if highlight_group then
+        table.insert(self.highlights, {
+            group = highlight_group,
+            start_col = start_col,
+            end_col = end_col,
+        })
+    end
+end
+
+---Add text with tree-sitter syntax highlighting
+---@param text string The text to highlight
+---@param lang string Language for tree-sitter
+function Content:add_with_treesitter(text, lang)
+    local start_col = self._current_col
+
+    -- First, just add the text normally
+    self:add(text)
+
+    -- Then apply tree-sitter highlights on top
+    local ok, parser = pcall(vim.treesitter.get_string_parser, text, lang)
+    if not ok or not parser then
+        return
+    end
+
+    local tree = parser:parse()[1]
+    if not tree then
+        return
+    end
+
+    local query = vim.treesitter.query.get(lang, "highlights")
+    if not query then
+        return
+    end
+
+    -- Add highlights for all captures (overlapping is fine)
+    for id, node in query:iter_captures(tree:root(), text, 0, -1) do
+        local capture_name = query.captures[id]
+        local start_row, start_col_rel, end_row, end_col_rel = node:range()
+
+        -- TODO: keep track of text as lines instead, so we can handle multiline
+        --       highlights
+        if start_row == end_row then -- Single line only
+            -- Convert to absolute column positions
+            local abs_start_col = start_col + start_col_rel
+            local abs_end_col = start_col + end_col_rel
+
+            -- Add the highlight
+            table.insert(self.highlights, {
+                group = "@" .. capture_name,
+                start_col = abs_start_col,
+                end_col = abs_end_col,
+            })
+        end
+    end
+end
+
+---Add a newline and reset column tracking
+function Content:newline()
+    self:add("\n")
+    self._current_col = 0
+end
+
+---Get the lines as a table
+---@return string[]
+function Content:get_lines()
+    return vim.split(self.text, "\n", { trimempty = true })
+end
+
+---Apply highlights to a buffer
+---@param ns_id integer
+---@param buf integer Buffer handle
+---@param line_offset? integer Line offset to apply highlights at (default 0)
+function Content:apply_highlights(ns_id, buf, line_offset)
+    line_offset = line_offset or 0
+    local lines = self:get_lines()
+    local current_line = 0
+    local line_start_col = 0
+
+    for _, highlight in ipairs(self.highlights) do
+        -- Find which line this highlight belongs to
+        while
+            current_line < #lines - 1
+            and highlight.start_col
+                >= line_start_col + #lines[current_line + 1] + 1
+        do
+            line_start_col = line_start_col + #lines[current_line + 1] + 1 -- +1 for newline
+            current_line = current_line + 1
+        end
+
+        -- Calculate column positions relative to line start
+        local start_col = highlight.start_col - line_start_col
+        local end_col = highlight.end_col - line_start_col
+
+        -- Apply highlight
+        vim.hl.range(
+            buf,
+            ns_id,
+            highlight.group,
+            { line_offset + current_line, start_col },
+            { line_offset + current_line, end_col }
+        )
+    end
+end
+
+return Content
diff --git a/lua/ow/dap/hover/node.lua b/lua/ow/dap/hover/node.lua
new file mode 100644
index 0000000..e3ca745
--- /dev/null
+++ b/lua/ow/dap/hover/node.lua
@@ -0,0 +1,141 @@
+-- Tree node representation for DAP variables
+local Content = require("ow.dap.hover.content")
+local log = require("ow.log")
+
+---@class ow.dap.hover.Node
+---@field item ow.dap.Item The DAP item this node represents
+---@field parent ow.dap.hover.Node? Parent node
+---@field children ow.dap.hover.Node[] Child nodes
+---@field is_expanded boolean Whether this node is expanded
+---@field line_number integer Buffer line number where this node is displayed
+---@field is_last_child boolean Whether this is the last child of its parent
+local Node = {}
+Node.__index = Node
+
+---Create a new tree node
+---@param item ow.dap.Item
+---@param parent ow.dap.hover.Node?
+---@return ow.dap.hover.Node
+function Node.new(item, parent)
+    return setmetatable({
+        item = item,
+        parent = parent,
+        children = {},
+        is_expanded = false,
+        line_number = -1,
+        is_last_child = false,
+    }, Node)
+end
+
+---Check if this node represents a container (struct/array)
+---@return boolean
+function Node:is_container()
+    return self.item.variablesReference and self.item.variablesReference > 0
+        or false
+end
+
+---Get the tree prefix for this node (├─, └─, │, etc.)
+---@return string
+function Node:get_tree_prefix()
+    if not self.parent then
+        return "" -- Root node has no prefix
+    end
+
+    local prefix = ""
+
+    -- Walk up the tree to build the prefix
+    local node = self.parent
+    while node and node.parent do
+        if node.is_last_child then
+            prefix = "   " .. prefix
+        else
+            prefix = "│  " .. prefix
+        end
+        node = node.parent
+    end
+
+    -- Add the final branch character
+    if self.is_last_child then
+        prefix = prefix .. "└─ "
+    else
+        prefix = prefix .. "├─ "
+    end
+
+    return prefix
+end
+
+---@return boolean
+function Node:is_c_array_element()
+    return self.item.name:match("^%[?%d+%]?$") ~= nil
+end
+
+---@return boolean
+function Node:is_c_pointer_child()
+    return self.parent
+            and self.parent.item.type:match(
+                "%*%s*[const%s]*[volatile%s]*[restrict%s]*$"
+            ) ~= nil
+        or false
+end
+
+---@return string
+function Node:format_c_expression()
+    if self:is_c_array_element() then
+        return string.format(
+            "%s = (%s) %s",
+            self.item.name,
+            self.item.type,
+            self.item.value
+        )
+    end
+
+    if self:is_c_pointer_child() then
+        return string.format("*%s = %s", self.parent.item.name, self.item.value)
+    end
+
+    return string.format(
+        "%s %s = %s",
+        self.item.type,
+        self.item.name,
+        self.item.value
+    )
+end
+
+---Format this node as highlighted content
+---@param session dap.Session DAP session for making requests
+---@return ow.dap.hover.Content
+function Node:format(session)
+    local content = Content.new()
+
+    -- Add expansion marker for containers
+    if self:is_container() then
+        local marker = self.is_expanded and "-" or "+"
+        content:add(marker .. " ", "@comment")
+    else
+        content:add("  ")
+    end
+
+    -- Add tree prefix
+    local tree_prefix = self:get_tree_prefix()
+    if tree_prefix ~= "" then
+        content:add(tree_prefix, "@comment")
+    end
+
+    local stmt
+    if session.filetype == "c" or session.filetype == "cpp" then
+        stmt = self:format_c_expression()
+    else
+        error(
+            string.format("Formatting for %s not implemented", session.filetype)
+        )
+    end
+    content:add_with_treesitter(stmt, session.filetype)
+
+    if self.item.value == "" then
+        content:add("...", "@comment")
+    end
+
+    return content
+end
+
+return Node
diff --git a/lua/ow/dap/hover/tree.lua b/lua/ow/dap/hover/tree.lua
new file mode 100644
index 0000000..47f9f1c
--- /dev/null
+++ b/lua/ow/dap/hover/tree.lua
@@ -0,0 +1,156 @@
+-- Tree-based DAP variable formatter with expand/collapse support
+local Content = require("ow.dap.hover.content")
+local Node = require("ow.dap.hover.node")
+local log = require("ow.log")
+
+---@class ow.dap.hover.Tree
+---@field session dap.Session
+---@field root_node ow.dap.hover.Node?
+---@field line_to_node table<integer, ow.dap.hover.Node> Map line numbers to nodes
+---@field extmark_to_node table<integer, ow.dap.hover.Node> Map extmark IDs to nodes
+local Tree = {}
+Tree.__index = Tree
+
+---Create a new tree formatter
+---@param session dap.Session
+---@return ow.dap.hover.Tree
+function Tree.new(session)
+    return setmetatable({
+        session = session,
+        root_node = nil,
+        line_to_node = {},
+        extmark_to_node = {},
+    }, Tree)
+end
+
+---Build the tree from a DAP item (async)
+---@async
+---@param item ow.dap.Item Root item to build tree from
+---@return ow.dap.hover.Node
+function Tree:build(item)
+    local root = Node.new(item, nil)
+    self.root_node = root
+
+    -- For now, start with everything collapsed
+    -- Later we can add logic to expand first level by default
+    return root
+end
+
+---Load children for a node (async)
+---@async
+---@param node ow.dap.hover.Node
+---@return boolean success Whether loading succeeded
+function Tree:load_children(node)
+    if not node:is_container() or #node.children > 0 then
+        return true -- Already loaded or not a container
+    end
+
+    local err, resp = self.session:request("variables", {
+        variablesReference = node.item.variablesReference,
+    })
+
+    if err or not resp or #resp.variables == 0 then
+        return false
+    end
+
+    -- Create child nodes
+    for i, var in ipairs(resp.variables) do
+        local child_item = {
+            name = var.name,
+            type = var.type,
+            value = var.value,
+            variablesReference = var.variablesReference,
+            depth = node.item.depth + 1,
+        }
+
+        local child = Node.new(child_item, node)
+        child.is_last_child = (i == #resp.variables)
+
+        -- Format array indices properly
+        if child_item.name:match("^%d+$") then
+            child_item.name = "[" .. child_item.name .. "]"
+        end
+
+        table.insert(node.children, child)
+    end
+
+    return true
+end
+
+---Render the tree to highlighted content
+---@async
+---@return ow.dap.hover.Content
+function Tree:render()
+    if not self.root_node then
+        return Content.new()
+    end
+
+    local content = Content.new()
+    self.line_to_node = {}
+
+    self:render_node(self.root_node, content, 0)
+    return content
+end
+
+---Render a single node and its expanded children
+---@async
+---@param node ow.dap.hover.Node
+---@param content ow.dap.hover.Content
+---@param line_number integer Current line number
+---@return integer new_line_number Updated line number after rendering
+function Tree:render_node(node, content, line_number)
+    -- Store line mapping
+    node.line_number = line_number
+    self.line_to_node[line_number] = node
+
+    -- Format this node
+    local node_content = node:format(self.session)
+    content.text = content.text .. node_content.text
+
+    -- Copy highlights, adjusting for current position
+    local text_offset = #content.text - #node_content.text
+    for _, highlight in ipairs(node_content.highlights) do
+        table.insert(content.highlights, {
+            group = highlight.group,
+            start_col = highlight.start_col + text_offset,
+            end_col = highlight.end_col + text_offset,
+        })
+    end
+
+    content:newline()
+    line_number = line_number + 1
+
+    -- Render expanded children
+    if node.is_expanded then
+        for _, child in ipairs(node.children) do
+            line_number = self:render_node(child, content, line_number)
+        end
+    end
+
+    return line_number
+end
+
+---Toggle expansion state of node at given line
+---@async
+---@param line_number integer
+---@return boolean success Whether toggle succeeded
+function Tree:toggle_at_line(line_number)
+    local node = self.line_to_node[line_number]
+    if not node or not node:is_container() then
+        return false
+    end
+
+    if not node.is_expanded then
+        -- Expanding: load children if needed
+        local success = self:load_children(node)
+        if not success then
+            return false
+        end
+    end
+
+    -- Toggle state
+    node.is_expanded = not node.is_expanded
+    return true
+end
+
+return Tree
diff --git a/lua/ow/dap/item.lua b/lua/ow/dap/item.lua
new file mode 100644
index 0000000..b1dc97e
--- /dev/null
+++ b/lua/ow/dap/item.lua
@@ -0,0 +1,43 @@
+-- DAP variable item representation
+
+---@class ow.dap.Item
+---@field name string
+---@field type string
+---@field value string
+---@field variablesReference? number
+---@field depth integer
+local Item = {}
+Item.__index = Item
+
+---Create a new item
+---@param name string
+---@param type string
+---@param value string
+---@param variablesReference? number
+---@param depth integer
+---@return ow.dap.Item
+function Item.new(name, type, value, variablesReference, depth)
+    return setmetatable({
+        name = name,
+        type = type,
+        value = value,
+        variablesReference = variablesReference,
+        depth = depth,
+    }, Item)
+end
+
+---Create item from DAP variable
+---@param var dap.Variable
+---@param depth integer
+---@return ow.dap.Item
+function Item.from_var(var, depth)
+    return Item.new(
+        var.name,
+        var.type,
+        var.value,
+        var.variablesReference,
+        depth
+    )
+end
+
+return Item
diff --git a/lua/ow/plugins/nvim-dap.lua b/lua/ow/plugins/nvim-dap.lua
index f65dd2e..48dcfc5 100644
--- a/lua/ow/plugins/nvim-dap.lua
+++ b/lua/ow/plugins/nvim-dap.lua
@@ -1,515 +1,6 @@
 -- https://github.com/mfussenegger/nvim-dap
 local log = require("ow.log")
-
----@class Item
----@field name string
----@field type string
----@field value string
----@field variablesReference? number
----@field depth integer
-local Item = {}
-Item.__index = Item
-
----@param name string
----@param type string
----@param value string
----@param variablesReference? number
----@param depth integer
----@return Item
-function Item.new(name, type, value, variablesReference, depth)
-    return setmetatable({
-        name = name,
-        type = type,
-        value = value,
-        variablesReference = variablesReference,
-        depth = depth,
-    }, Item)
-end
-
----@param var dap.Variable
----@param depth integer
----@return Item
-function Item.from_var(var, depth)
-    return Item.new(
-        var.name,
-        var.type,
-        var.value,
-        var.variablesReference,
-        depth
-    )
-end
-
----@class FormatResult
----@field success boolean
----@field error? dap.ErrorResponse
----@field value? string
-local FormatResult = {}
-FormatResult.__index = FormatResult
-
----@param error? dap.ErrorResponse
----@param value? string
----@return FormatResult
-function FormatResult.new(error, value)
-    return setmetatable({
-        success = not error and true or false,
-        error = error,
-        value = value,
-    }, FormatResult)
-end
-
----@class BaseFormatter
----@field session dap.Session
----@field MAX_DEPTH integer
----@field INDENT string
-local BaseFormatter = {}
-BaseFormatter.__index = BaseFormatter
-
-BaseFormatter.MAX_DEPTH = 2
-BaseFormatter.INDENT = "  "
-
----@return BaseFormatter
-function BaseFormatter:new(session)
-    return setmetatable({ session = session }, self)
-end
-
----@param item Item
----@return FormatResult
----@diagnostic disable-next-line: unused-local
-function BaseFormatter:format(item)
-    return FormatResult.new(nil, item.value)
-end
-
----@param item Item
----@return boolean
-function BaseFormatter:is_container(item)
-    return item.variablesReference and item.variablesReference > 0 or false
-end
-
----@param level integer
----@return string
-function BaseFormatter:make_indent(level)
-    return string.rep(self.INDENT, level)
-end
-
----@class CFormatter: BaseFormatter
-local CFormatter = {}
-CFormatter.__index = CFormatter
-setmetatable(CFormatter, BaseFormatter)
-
-CFormatter.MAX_ARR_ELEMENTS = 10
-CFormatter.ARRAY_ELEM_PFX = ""
-CFormatter.STRUCT_FIELD_PFX = "."
-CFormatter.PLACEHOLDER = "..."
-
----@param item Item
----@return boolean
-function CFormatter:is_pointer(item)
-    return item.type:match("%*%s*[const%s]*[volatile%s]*[restrict%s]*$") ~= nil
-end
-
----@param item Item
----@return boolean
-function CFormatter:is_null_pointer(item)
-    return self:is_pointer(item) and item.value:match("^0x0+$")
-end
-
----@async
----@param item Item
----@return FormatResult
-function CFormatter:format_pointer(item)
-    if self:is_null_pointer(item) then
-        return FormatResult.new(nil, "nullptr")
-    elseif not item.value:match("^0x%x+$") then
-        -- Value contains more than just a pointer address
-        -- (e.g., "0x12345 \"hello\"" for char*)
-        -- Remove the leading address to show just the meaningful content
-        return FormatResult.new(nil, item.value:gsub("^0x%x+%s*", ""))
-    elseif
-        item.depth == CFormatter.MAX_DEPTH
-        or not self:is_container(item)
-    then
-        return FormatResult.new(nil, item.value)
-    end
-
-    local err, resp = self.session:request("variables", {
-        variablesReference = item.variablesReference,
-    })
-    if err or not resp then
-        return FormatResult.new(err)
-    end
-
-    if #resp.variables == 0 then
-        return FormatResult.new(nil, item.value)
-    elseif #resp.variables == 1 then
-        local var = resp.variables[1]
-        local inner = Item.from_var(var, item.depth)
-        return self:format_value(inner)
-    else
-        return self:format_container(item, resp.variables)
-    end
-end
-
----@async
----@param item Item
----@param vars dap.Variable[]?
----@return FormatResult
-function CFormatter:format_container(item, vars)
-    if item.depth >= CFormatter.MAX_DEPTH then
-        return FormatResult.new(
-            nil,
-            vim.trim(item.value) ~= "" and item.value
-                or string.format("{%s}", CFormatter.PLACEHOLDER)
-        )
-    end
-
-    if not vars then
-        local err, resp = self.session:request("variables", {
-            variablesReference = item.variablesReference,
-        })
-        if err or not resp then
-            return FormatResult.new(err)
-        end
-
-        vars = resp.variables
-    end
-
-    if #vars == 0 then
-        return FormatResult.new(nil, item.value)
-    end
-
-    ---@type Item[]
-    local items = {}
-    for _, var in ipairs(vars) do
-        table.insert(items, Item.from_var(var, item.depth + 1))
-    end
-
-    local is_array = false
-    local pfx
-    if items[1].name:match("^%[?%d+%]?$") then
-        is_array = true
-        pfx = CFormatter.ARRAY_ELEM_PFX
-    else
-        pfx = CFormatter.STRUCT_FIELD_PFX
-    end
-
-    local indent = self:make_indent(items[1].depth)
-    local content = "{\n"
-
-    for i, inner in ipairs(items) do
-        if is_array and i > CFormatter.MAX_ARR_ELEMENTS then
-            content = content
-                .. string.format("%s%s\n", indent, CFormatter.PLACEHOLDER)
-            break
-        end
-
-        if is_array and inner.name:match("^%d+$") then
-            inner.name = "[" .. inner.name .. "]"
-        end
-
-        local res = self:format(inner)
-        if not res.success then
-            return res
-        end
-
-        content = content .. string.format("%s%s%s,\n", indent, pfx, res.value)
-    end
-
-    content = content .. self:make_indent(item.depth) .. "}"
-    return FormatResult.new(nil, content)
-end
-
----@async
----@param item Item
----@return FormatResult
-function CFormatter:format_value(item)
-    if self:is_pointer(item) then
-        return self:format_pointer(item)
-    elseif self:is_container(item) then
-        return self:format_container(item)
-    else
-        return FormatResult.new(nil, item.value)
-    end
-end
-
----@async
----@param item Item
----@return FormatResult
-function CFormatter:format(item)
-    local res = self:format_value(item)
-    if not res.success then
-        return res
-    end
-
-    if self:is_container(item) and not self:is_null_pointer(item) then
-        local value = string.format(
-            "%s(%s) %s",
-            item.name ~= "" and string.format("%s = ", item.name) or "",
-            item.type,
-            res.value
-        )
-        return FormatResult.new(nil, value)
-    else
-        local value = string.format("%s = %s", item.name, res.value)
-        return FormatResult.new(nil, value)
-    end
-end
-
----@class HoverState
----@field MAX_WIDTH integer
----@field MAX_HEIGHT integer
----@field current_win? integer
----@field session dap.Session
----@field frame_id number
----@field line_nr integer
----@field col_nr integer
----@field current_file string
----@field lines string[]
----@field depth integer
-local HoverState = {}
-HoverState.__index = HoverState
-
-HoverState.MAX_WIDTH = 80
-HoverState.MAX_HEIGHT = 20
-
-function HoverState.new(session, frame_id, line_nr, col_nr, current_file)
-    return setmetatable({
-        session = session,
-        frame_id = frame_id,
-        line_nr = line_nr,
-        col_nr = col_nr,
-        current_file = current_file,
-        lines = {},
-        depth = 0,
-    }, HoverState)
-end
-
-function HoverState.close()
-    if
-        HoverState.current_win
-        and vim.api.nvim_win_is_valid(HoverState.current_win)
-    then
-        vim.api.nvim_win_close(HoverState.current_win, true)
-    end
-    HoverState.current_win = nil
-end
-
----@param content string
-function HoverState:render(content)
-    local lines = vim.split(content, "\n")
-    local filetype = self.session.filetype
-
-    local orig_buf = vim.api.nvim_get_current_buf()
-    local hover_buf = vim.api.nvim_create_buf(false, true)
-    vim.api.nvim_buf_set_lines(hover_buf, 0, -1, false, lines)
-    vim.api.nvim_set_option_value(
-        "filetype",
-        filetype or self.session.filetype,
-        { buf = hover_buf }
-    )
-
-    local max_width = 0
-    for _, line in ipairs(lines) do
-        if #line >= HoverState.MAX_WIDTH then
-            max_width = HoverState.MAX_WIDTH
-            break
-        end
-        max_width = math.max(max_width, #line)
-    end
-
-    if max_width == 0 then
-        return
-    end
-
-    local win = vim.api.nvim_open_win(hover_buf, false, {
-        relative = "cursor",
-        width = max_width,
-        height = 1,
-        row = 1,
-        col = 0,
-        border = "rounded",
-        style = "minimal",
-        hide = true,
-    })
-
-    vim.api.nvim_win_set_config(win, {
-        height = math.min(
-            HoverState.MAX_HEIGHT,
-            vim.api.nvim_win_text_height(win, {}).all
-        ),
-        hide = false,
-    })
-
-    HoverState.current_win = win
-
-    vim.api.nvim_create_autocmd({ "CursorMoved", "InsertEnter" }, {
-        buffer = orig_buf,
-        once = true,
-        callback = HoverState.close,
-    })
-
-    vim.api.nvim_create_autocmd("WinLeave", {
-        buffer = hover_buf,
-        once = true,
-        callback = HoverState.close,
-    })
-end
-
----@return BaseFormatter
-function HoverState:get_formatter()
-    local filetype = self.session.filetype
-    if filetype == "c" or filetype == "cpp" then
-        return CFormatter:new(self.session)
-    else
-        return BaseFormatter:new(self.session)
-    end
-end
-
----@async
----@param expr string
----@return dap.ErrorResponse?, string?
-function HoverState:eval(expr)
-    local request = {
-        expression = expr,
-        frameId = self.frame_id,
-        context = "hover",
-        line = self.line_nr,
-        column = self.col_nr,
-        source = {
-            path = self.current_file,
-        },
-    }
-
-    local eval
-    do
-        local err, resp = self.session:request("evaluate", request)
-        if err or not resp then
-            return err
-        end
-
-        eval = resp
-    end
-
-    local fmt = self:get_formatter()
-    local res = fmt:format(
-        Item.new(expr, eval.type, eval.result, eval.variablesReference, 0)
-    )
-    if not res.success then
-        return res.error
-    end
-
-    return nil, res.value
-end
-
----@async
-local function hover_async()
-    if
-        HoverState.current_win
-        and vim.api.nvim_win_is_valid(HoverState.current_win)
-    then
-        vim.api.nvim_set_current_win(HoverState.current_win)
-        return
-    end
-
-    local dap = require("dap")
-    local session = dap.session()
-    if not session then
-        return
-    end
-
-    local capabilities = session.capabilities or {}
-    local supports_hover = capabilities.supportsEvaluateForHovers
-
-    if not supports_hover then
-        log.warning("Hover is not supported by this adapter")
-        return
-    end
-
-    local cursor_pos = vim.api.nvim_win_get_cursor(0)
-    local line_nr = cursor_pos[1] -- nvim-dap sets linesStartAt1=true
-    local col_nr = cursor_pos[2] + 1 -- nvim-dap sets columnsStartAt1=true
-    local current_file = vim.api.nvim_buf_get_name(0)
-
-    local expr
-    local mode = vim.api.nvim_get_mode()
-    if mode.mode == "v" then
-        local start_pos = vim.fn.getpos("v")
-        local end_pos = vim.fn.getpos(".")
-
-        local start_row, start_col = start_pos[2], start_pos[3]
-        local end_row, end_col = end_pos[2], end_pos[3]
-
-        if start_row == end_row and end_col < start_col then
-            start_col, end_col = end_col, start_col
-        elseif end_row < start_row then
-            start_row, end_row = end_row, start_row
-            start_col, end_col = end_col, start_col
-        end
-
-        local lines = vim.api.nvim_buf_get_text(
-            0,
-            start_row - 1,
-            start_col - 1,
-            end_row - 1,
-            end_col,
-            {}
-        )
-        expr = table.concat(lines, "\n")
-
-        vim.api.nvim_feedkeys(
-            vim.api.nvim_replace_termcodes("<ESC>", true, false, true),
-            "n",
-            false
-        )
-    else
-        expr = vim.fn.expand("<cexpr>")
-    end
-
-    if expr == "" then
-        return
-    end
-
-    local thread_id
-    do
-        local err, resp = session:request("threads", nil)
-        if err or not resp or #resp.threads == 0 then
-            log.warning("Failed to get threads: %s", err)
-            return
-        end
-        thread_id = resp.threads[1].id
-    end
-
-    local frame_id
-    do
-        local err, resp =
-            session:request("stackTrace", { threadId = thread_id })
-        if err or not resp or #resp.stackFrames == 0 then
-            log.warning("Failed to get stack trace: %s", err)
-            return
-        end
-
-        frame_id = resp.stackFrames[1].id
-    end
-
-    local state =
-        HoverState.new(session, frame_id, line_nr, col_nr, current_file)
-
-    local err, resp = state:eval(expr)
-    if err or not resp then
-        log.warning("Failed to evaluate '%s': %s", expr, err)
-        return
-    end
-
-    state:render(resp)
-end
-
-local function hover()
-    coroutine.wrap(function()
-        local ok, err = xpcall(hover_async, debug.traceback)
-        if not ok then
-            log.error("Hover failed:\n%s", err)
-        end
-    end)()
-end
+local hover = require("ow.dap.hover")
 
 ---@type LazyPluginSpec
 return {