From 540fbc87ea69a58d333a1810d22e60276af6e097 Mon Sep 17 00:00:00 2001
From: Bill Somerville <g4wjs@classdesign.com>
Date: Tue, 1 Dec 2015 23:03:54 +0000
Subject: [PATCH] Add facility for user configuration of Hamlib settings

A user  written JSON file may  be used to define  Hamlib configuration
settings, for  example to increase  the communications time out  to 10
seconds create the file hamlib_settings.json containing:

{
  "config": {
    "timeout": 10000
  }
}

in the application specific configuration  directory. On Windows it is
%LOCALAPPDATA%\<app-name>\,  on  Linux   it  is  ~/.config/<app-name>/
(~/.config/    before    Qt    5.5)    and   on    OS    X    it    is
~/Librry/Preferences/<app-name>   (~/Library/Preferences/  before   Qt
5.5).

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6213 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 HamlibTransceiver.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/HamlibTransceiver.cpp b/HamlibTransceiver.cpp
index 4a920aabb..b584d23c4 100644
--- a/HamlibTransceiver.cpp
+++ b/HamlibTransceiver.cpp
@@ -4,6 +4,11 @@
 
 #include <QByteArray>
 #include <QString>
+#include <QStandardPaths>
+#include <QFile>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonValue>
 #include <QDebug>
 
 #include "moc_HamlibTransceiver.cpp"
@@ -230,6 +235,52 @@ HamlibTransceiver::HamlibTransceiver (int model_number, TransceiverFactory::Para
 
   // rig_->state.obj = this;
 
+  {
+    //
+    // user defined Hamlib settings
+    //
+    QFile settings_file {QStandardPaths::locate (
+#if QT_VERSION >= 0x050500
+                                                 QStandardPaths::AppConfigLocation
+#else
+                                                 QStandardPaths::ConfigLocation
+#endif
+                                                 , "hamlib_settings.json")};
+    if (settings_file.open (QFile::ReadOnly))
+      {
+        QJsonParseError status;
+        auto settings_doc = QJsonDocument::fromJson (settings_file.readAll (), &status);
+        if (status.error)
+          {
+            throw error {tr ("Hamlib settings file error: %1 at character offset %2")
+                .arg (status.errorString ()).arg (status.offset)};
+          }
+        if (!settings_doc.isObject ())
+          {
+            throw error {tr ("Hamlib settings file error: top level must be a JSON object")};
+          }
+        auto const& settings = settings_doc.object ();
+
+        //
+        // configuration settings
+        //
+        auto const& config = settings["config"];
+        if (!config.isUndefined ())
+          {
+            if (!config.isObject ())
+              {
+                throw error {tr ("Hamlib settings file error: config must be a JSON object")};
+              }
+            auto const& config_list = config.toObject ();
+            for (auto item = config_list.constBegin (); item != config_list.constEnd (); ++item)
+              {
+                set_conf (item.key ().toLocal8Bit ().constData ()
+                          , (*item).toVariant ().toString ().toLocal8Bit ().constData ());
+              }
+          }
+      }
+  }
+
   if (RIG_MODEL_DUMMY != model_number)
     {
       switch (rig_->caps->port_type)