working on todo.md features

src/config.cpp

@@ -54,9 +54,14 @@ void print_usage(std::FILE* out, const char* argv0) {
                "  --recv-buffer BYTES  SO_RCVBUF for the receiver socket (default 8388608)\n"
                "  --plots N            stacked plots to start with, 1..8 (default 1); rows are\n"
                "                       added and removed from the layout editor\n"
+               "  --capture-packets N  store the last N raw datagrams on disk for forensics, in a\n"
+               "                       ring under the cache directory (1000 slots is ~62.6 MiB);\n"
+               "                       off unless given, and toggleable from the status bar\n"
                "  --relative-time      take the plot's time from the packet counter and the\n"
                "                       declared rate, not the stream's time signal; absolute\n"
                "                       time is then kept for export only\n"
+               "  --open FILE          open an exported waveform (.npy) instead of a live source:\n"
+               "                       signals from its columns, no socket, no acquisition\n"
                "  -h, --help           this text\n",
                argv0);
 }
@@ -82,6 +87,7 @@ Config parse_args(int argc, char** argv) {
       c.interface_addr = value_of(argc, argv, i, "--interface");
     } else if (a == "--buffer-mb" || a.rfind("--buffer-mb=", 0) == 0) {
       c.buffer_mb = parse_double("--buffer-mb", value_of(argc, argv, i, "--buffer-mb"));
+      c.buffer_mb_specified = true;
       if (c.buffer_mb < 1.0) fail("--buffer-mb must be at least 1");
     } else if (a == "--max-window" || a.rfind("--max-window=", 0) == 0) {
       c.max_window_s = parse_double("--max-window", value_of(argc, argv, i, "--max-window"));
@@ -101,6 +107,12 @@ Config parse_args(int argc, char** argv) {
         fail("--plots must be 1.." + std::to_string(RowSet::kMaxRows) + ": " + v);
       }
       c.plots = static_cast<int>(n);
+    } else if (a == "--capture-packets" || a.rfind("--capture-packets=", 0) == 0) {
+      const long n = std::strtol(value_of(argc, argv, i, "--capture-packets").c_str(), nullptr, 10);
+      if (n < 1 || n > 100000) fail("--capture-packets must be 1..100000");
+      c.capture_packets = static_cast<std::uint32_t>(n);
+    } else if (a == "--open" || a.rfind("--open=", 0) == 0) {
+      c.open_waveform = value_of(argc, argv, i, "--open");
     } else if (a == "--relative-time") {
       c.relative_time = true;
     } else {