feat: add the entire plugin

lua/fugitive-ts/highlight.lua

@@ -0,0 +1,52 @@
+local M = {}
+
+function M.highlight_hunk(bufnr, ns, hunk)
+  local lang = hunk.lang
+  if not lang then
+    return
+  end
+
+  local code_lines = {}
+  for _, line in ipairs(hunk.lines) do
+    table.insert(code_lines, line:sub(2))
+  end
+
+  local code = table.concat(code_lines, '\n')
+  if code == '' then
+    return
+  end
+
+  local ok, parser_obj = pcall(vim.treesitter.get_string_parser, code, lang)
+  if not ok or not parser_obj then
+    return
+  end
+
+  local trees = parser_obj:parse()
+  if not trees or #trees == 0 then
+    return
+  end
+
+  local query = vim.treesitter.query.get(lang, 'highlights')
+  if not query then
+    return
+  end
+
+  for id, node, _ in query:iter_captures(trees[1]:root(), code) do
+    local capture_name = '@' .. query.captures[id]
+    local sr, sc, er, ec = node:range()
+
+    local buf_sr = hunk.start_line + sr
+    local buf_er = hunk.start_line + er
+    local buf_sc = sc + 1
+    local buf_ec = ec + 1
+
+    pcall(vim.api.nvim_buf_set_extmark, bufnr, ns, buf_sr, buf_sc, {
+      end_row = buf_er,
+      end_col = buf_ec,
+      hl_group = capture_name,
+      priority = 200,
+    })
+  end
+end
+
+return M