1 files changed, 168 insertions, 0 deletions
diff --git a/runtime/lua/vim/pack/_lsp.lua b/runtime/lua/vim/pack/_lsp.lua
new file mode 100644
index 0000000000..52dff730c2
--- /dev/null
+++ b/runtime/lua/vim/pack/_lsp.lua
@@ -0,0 +1,168 @@
+local M = {}
+
+local capabilities = {
+  codeActionProvider = true,
+  documentSymbolProvider = true,
+  hoverProvider = true,
+}
+--- @type table<string,function>
+local methods = {}
+
+--- @param callback function
+function methods.initialize(_, callback)
+  return callback(nil, { capabilities = capabilities })
+end
+
+--- @param callback function
+function methods.shutdown(_, callback)
+  return callback(nil, nil)
+end
+
+local get_confirm_bufnr = function(uri)
+  return tonumber(uri:match('^nvim%-pack://(%d+)/confirm%-update$'))
+end
+
+--- @param params { textDocument: { uri: string } }
+--- @param callback function
+methods['textDocument/documentSymbol'] = function(params, callback)
+  local bufnr = get_confirm_bufnr(params.textDocument.uri)
+  if bufnr == nil then
+    return callback(nil, {})
+  end
+
+  --- @alias vim.pack.lsp.Position { line: integer, character: integer }
+  --- @alias vim.pack.lsp.Range { start: vim.pack.lsp.Position, end: vim.pack.lsp.Position }
+  --- @alias vim.pack.lsp.Symbol {
+  ---   name: string,
+  ---   kind: number,
+  ---   range: vim.pack.lsp.Range,
+  ---   selectionRange: vim.pack.lsp.Range,
+  ---   children: vim.pack.lsp.Symbol[]?,
+  --- }
+
+  --- @return vim.pack.lsp.Symbol?
+  local new_symbol = function(name, start_line, end_line, kind)
+    if name == nil then
+      return nil
+    end
+    local range = {
+      start = { line = start_line, character = 0 },
+      ['end'] = { line = end_line, character = 0 },
+    }
+    return { name = name, kind = kind, range = range, selectionRange = range }
+  end
+
+  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+
+  --- @return vim.pack.lsp.Symbol[]
+  local parse_headers = function(pattern, start_line, end_line, kind)
+    local res, cur_match, cur_start = {}, nil, nil
+    for i = start_line, end_line do
+      local m = lines[i + 1]:match(pattern)
+      if m ~= nil and m ~= cur_match then
+        table.insert(res, new_symbol(cur_match, cur_start, i, kind))
+        cur_match, cur_start = m, i
+      end
+    end
+    table.insert(res, new_symbol(cur_match, cur_start, end_line, kind))
+    return res
+  end
+
+  local group_kind = vim.lsp.protocol.SymbolKind.Namespace
+  local symbols = parse_headers('^# (%S+)', 0, #lines - 1, group_kind)
+
+  local plug_kind = vim.lsp.protocol.SymbolKind.Module
+  for _, group in ipairs(symbols) do
+    local start_line, end_line = group.range.start.line, group.range['end'].line
+    group.children = parse_headers('^## (.+)$', start_line, end_line, plug_kind)
+  end
+
+  return callback(nil, symbols)
+end
+
+--- @param callback function
+methods['textDocument/codeAction'] = function(_, callback)
+  -- TODO(echasnovski)
+  -- Suggested actions for "plugin under cursor":
+  -- - Delete plugin from disk.
+  -- - Update only this plugin.
+  -- - Exclude this plugin from update.
+  return callback(_, {})
+end
+
+--- @param params { textDocument: { uri: string }, position: { line: integer, character: integer } }
+--- @param callback function
+methods['textDocument/hover'] = function(params, callback)
+  local bufnr = get_confirm_bufnr(params.textDocument.uri)
+  if bufnr == nil then
+    return
+  end
+
+  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+  local lnum = params.position.line + 1
+  local commit = lines[lnum]:match('^[<>] (%x+) │') or lines[lnum]:match('^State.*:%s+(%x+)')
+  local tag = lines[lnum]:match('^• (.+)$')
+  if commit == nil and tag == nil then
+    return
+  end
+
+  local path, path_lnum = nil, lnum - 1
+  while path == nil and path_lnum >= 1 do
+    path = lines[path_lnum]:match('^Path:%s+(.+)$')
+    path_lnum = path_lnum - 1
+  end
+  if path == nil then
+    return
+  end
+
+  local cmd = { 'git', 'show', '--no-color', commit or tag }
+  --- @param sys_out vim.SystemCompleted
+  local on_exit = function(sys_out)
+    local markdown = '```diff\n' .. sys_out.stdout .. '\n```'
+    local res = { contents = { kind = vim.lsp.protocol.MarkupKind.Markdown, value = markdown } }
+    callback(nil, res)
+  end
+  vim.system(cmd, { cwd = path }, vim.schedule_wrap(on_exit))
+end
+
+local dispatchers = {}
+
+-- TODO: Simplify after `vim.lsp.server` is a thing
+-- https://github.com/neovim/neovim/pull/24338
+local cmd = function(disp)
+  -- Store dispatchers to use for showing progress notifications
+  dispatchers = disp
+  local res, closing, request_id = {}, false, 0
+
+  function res.request(method, params, callback)
+    local method_impl = methods[method]
+    if method_impl ~= nil then
+      method_impl(params, callback)
+    end
+    request_id = request_id + 1
+    return true, request_id
+  end
+
+  function res.notify(method, _)
+    if method == 'exit' then
+      dispatchers.on_exit(0, 15)
+    end
+    return false
+  end
+
+  function res.is_closing()
+    return closing
+  end
+
+  function res.terminate()
+    closing = true
+  end
+
+  return res
+end
+
+M.client_id = assert(
+  vim.lsp.start({ cmd = cmd, name = 'vim.pack', root_dir = vim.uv.cwd() }, { attach = false })
+)
+
+return M