Add -debugexclude option to switch off logging for specified components

Author: jnewbery

src/init.cpp

@@ -443,6 +443,7 @@ std::string HelpMessage(HelpMessageMode mode)
     }
     strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
         _("If <category> is not supplied or if <category> = 1, output all debugging information.") + " " + _("<category> can be:") + " " + ListLogCategories() + ".");
+    strUsage += HelpMessageOpt("-debugexclude=<category>", strprintf(_("Exclude debugging information for a category. Can be used in conjunction with -debug=1 to output debug logs for all categories except one or more specified categories.")));
     if (showDebug)
         strUsage += HelpMessageOpt("-nodebug", "Turn off debugging messages, same as -debug=0");
     strUsage += HelpMessageOpt("-help-debug", _("Show all debugging options (usage: --help -help-debug)"));
@@ -914,13 +915,25 @@ bool AppInitParameterInteraction()
             for (const auto& cat : categories) {
                 uint32_t flag;
                 if (!GetLogCategory(&flag, &cat)) {
-                    InitWarning(strprintf(_("Unsupported logging category %s.\n"), cat));
+                    InitWarning(strprintf(_("Unsupported logging category %s=%s."), "-debug", cat));
                 }
                 logCategories |= flag;
             }
         }
     }
 
+    // Now remove the logging categories which were explicitly excluded
+    if (mapMultiArgs.count("-debugexclude") > 0) {
+        const std::vector<std::string>& excludedCategories = mapMultiArgs.at("-debugexclude");
+        for (const auto& cat : excludedCategories) {
+            uint32_t flag;
+            if (!GetLogCategory(&flag, &cat)) {
+                InitWarning(strprintf(_("Unsupported logging category %s=%s."), "-debugexclude", cat));
+            }
+            logCategories &= ~flag;
+        }
+    }
+
     // Check for -debugnet
     if (GetBoolArg("-debugnet", false))
         InitWarning(_("Unsupported argument -debugnet ignored, use -debug=net."));