fix TSamFailedOnly and the output formatting for the go-runner

lua/test-samurai/core.lua

@@ -8,6 +8,7 @@ local state = {
   last_win = nil,
   last_buf = nil,
   last_command = nil,
+  last_runner = nil,
   last_scope_command = nil,
   last_scope_runner = nil,
   last_scope_kind = nil,
@@ -57,6 +58,7 @@ function M.setup()
   load_runners()
   ensure_output_autocmds()
   state.last_command = nil
+  state.last_runner = nil
   state.last_scope_command = nil
   state.last_scope_runner = nil
   state.last_scope_kind = nil
@@ -337,6 +339,7 @@ local function run_command(command, opts)
         cmd = vim.deepcopy(command.cmd),
         cwd = command.cwd,
       }
+      state.last_runner = options.runner
     end
     if options.track_scope then
       state.last_scope_command = {
@@ -489,7 +492,18 @@ function M.run_last()
     cmd = vim.deepcopy(state.last_command.cmd),
     cwd = state.last_command.cwd,
   }
-  run_command(command)
+  local runner = state.last_runner
+  local parser = nil
+  if runner then
+    parser = runner.output_parser
+    if type(parser) == "function" then
+      parser = parser()
+    end
+  end
+  run_command(command, {
+    runner = runner,
+    output_parser = parser or (runner and runner.parse_results),
+  })
 end
 
 function M.run_nearest()
@@ -642,7 +656,18 @@ function M.run_failed_only()
     return
   end
 
-  run_command(command, { save_last = false })
+  local runner = state.last_scope_runner
+  local parser = nil
+  if runner then
+    parser = runner.output_parser
+    if type(parser) == "function" then
+      parser = parser()
+    end
+  end
+  run_command(command, {
+    save_last = false,
+    output_parser = parser or (runner and runner.parse_results),
+  })
 end
 
 function M.show_output()

lua/test-samurai/runners/go.lua

@@ -201,6 +201,22 @@ function runner.build_file_command(bufnr)
   local spec = { file = path, cwd = root }
   local pkg = build_pkg_arg(spec)
   local cmd = { "go", "test", "-json", pkg }
+  local lines = util.get_buf_lines(bufnr)
+  local funcs = find_test_functions(lines)
+  local names = {}
+  for _, fn in ipairs(funcs) do
+    table.insert(names, fn.name)
+  end
+  names = collect_unique(names)
+  if #names > 0 then
+    local pattern_parts = {}
+    for _, name in ipairs(names) do
+      table.insert(pattern_parts, escape_go_regex(name))
+    end
+    local pattern = "^(" .. table.concat(pattern_parts, "|") .. ")$"
+    table.insert(cmd, "-run")
+    table.insert(cmd, pattern)
+  end
   return {
     cmd = cmd,
     cwd = root,