feat(blame): show commit's hunk in the line popup

lua/git/hunks.lua

@@ -1,3 +1,4 @@
+local popup = require("git.core.popup")
 local repo = require("git.core.repo")
 local util = require("git.core.util")
 
@@ -5,6 +6,9 @@ local M = {}
 
 local NS_SIGNS = vim.api.nvim_create_namespace("ow.git.hunks")
 local NS_OVERLAY = vim.api.nvim_create_namespace("ow.git.hunks.overlay")
+local NS_PREVIEW = vim.api.nvim_create_namespace("ow.git.hunks.preview")
+local NS_PREVIEW_OVERFLOW =
+    vim.api.nvim_create_namespace("ow.git.hunks.preview.overflow")
 
 ---@alias ow.Git.Hunks.HunkType "add"|"change"|"delete"
 
@@ -905,16 +909,9 @@ function M.preview_hunk(buf)
     local lines = hunk_body(h)
     local pbuf = vim.api.nvim_create_buf(false, true)
     vim.api.nvim_buf_set_lines(pbuf, 0, -1, false, lines)
-    vim.bo[pbuf].filetype = "diff"
     vim.bo[pbuf].bufhidden = "wipe"
-    local width = 0
-    for _, l in ipairs(lines) do
-        if #l > width then
-            width = #l
-        end
-    end
-    width = math.min(math.max(width + 2, 40), vim.o.columns - 4)
-    local height = math.min(#lines, math.floor(vim.o.lines / 2))
+    util.paint_diff_lines(pbuf, NS_PREVIEW, lines, 0)
+    local width, height = popup.size_for(lines, { min_width = 40, padding = 2 })
     local win = vim.api.nvim_open_win(pbuf, false, {
         relative = "cursor",
         row = 1,
@@ -924,6 +921,7 @@ function M.preview_hunk(buf)
         style = "minimal",
     })
     preview_win = win
+    popup.paint_overflow(pbuf, win, NS_PREVIEW_OVERFLOW)
 
     local function close()
         if vim.api.nvim_win_is_valid(win) then
@@ -949,6 +947,13 @@ function M.preview_hunk(buf)
             pcall(vim.api.nvim_del_augroup_by_name, "ow.git.hunks.preview")
         end,
     })
+    vim.api.nvim_create_autocmd("WinScrolled", {
+        group = group,
+        pattern = tostring(win),
+        callback = function()
+            popup.paint_overflow(pbuf, win, NS_PREVIEW_OVERFLOW)
+        end,
+    })
     vim.keymap.set("n", "q", close, { buffer = pbuf, nowait = true })
 end