qt: Add method for getting config entries for components by entry name

* lang/qt/src/cryptoconfig.h, lang/qt/src/cryptoconfig.cpp
(CryptoConfig::entry): Move implementation to cpp. Add overload not
requiring a group name.
--

The group name is not needed for identifying a config entry because the
groups only provide a logical grouping of config entry for user
interfaces. To improve usability entries are sometimes moved to a
different group, but this shouldn't break existing applications trying
to access those entries. The new group-agnostic overload makes
applications robust against regrouping of config entries.

GnuPG-bug-id: 5217

3 files changed, 39 insertions, 7 deletions

diff --git a/NEWS b/NEWS
index b6c994cd..3a4065f2 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,10 @@ Noteworthy changes in version 1.15.2 (unreleased)
 -------------------------------------------------
 
 
+ * Interface changes relative to the 1.15.1 release:
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ qt: CryptoConfig::entry               CHANGED: Added overload; deprecated old
+
 
 Noteworthy changes in version 1.15.1 (2021-01-08)
 -------------------------------------------------
diff --git a/lang/qt/src/cryptoconfig.cpp b/lang/qt/src/cryptoconfig.cpp
index 71212200..d52dce73 100644
--- a/lang/qt/src/cryptoconfig.cpp
+++ b/lang/qt/src/cryptoconfig.cpp
@@ -43,3 +43,23 @@ QStringList CryptoConfigEntry::stringValueList() const
     }
     return entry->stringValueList();
 }
+
+QGpgME::CryptoConfigEntry *CryptoConfig::entry(const QString &componentName, const QString &entryName) const
+{
+    const CryptoConfigComponent *comp = component(componentName);
+    const QStringList groupNames = comp->groupList();
+    for (const auto &groupName : groupNames) {
+        const CryptoConfigGroup *group = comp ? comp->group(groupName) : nullptr;
+        if (CryptoConfigEntry *entry = group->entry(entryName)) {
+            return entry;
+        }
+    }
+    return nullptr;
+}
+
+QGpgME::CryptoConfigEntry *CryptoConfig::entry(const QString &componentName, const QString &groupName, const QString &entryName) const
+{
+    const CryptoConfigComponent *comp = component(componentName);
+    const CryptoConfigGroup *group = comp ? comp->group(groupName) : nullptr;
+    return group ? group->entry(entryName) : nullptr;
+}
diff --git a/lang/qt/src/cryptoconfig.h b/lang/qt/src/cryptoconfig.h
index d7aae9d7..651e2af1 100644
--- a/lang/qt/src/cryptoconfig.h
+++ b/lang/qt/src/cryptoconfig.h
@@ -373,18 +373,26 @@ public:
 
     /**
      * Convenience method to get hold of a single configuration entry when
-     * its component, group and name are known. This can be used to read
+     * its component and name are known. This can be used to read
      * the value and/or to set a value to it.
      *
      * @return the configuration object for a single configuration entry, 0 if not found.
      * The object is owned by CryptoConfig, don't delete it.
      */
-    CryptoConfigEntry *entry(const QString &componentName, const QString &groupName, const QString &entryName) const
-    {
-        const QGpgME::CryptoConfigComponent *comp = component(componentName);
-        const QGpgME::CryptoConfigGroup *group = comp ? comp->group(groupName) : nullptr;
-        return group ? group->entry(entryName) : nullptr;
-    }
+    CryptoConfigEntry *entry(const QString &componentName, const QString &entryName) const;
+
+    /**
+     * This function is obsolete. It is provided to keep old source code working.
+     * We strongly advise against using it in new code.
+     *
+     * This function overloads @ref entry().
+     *
+     * Use the entry overload that does not require a group name instead. The group name
+     * is not needed to identify a configuration entry because it only provides logical
+     * grouping for user interfaces. Sometimes configuration entries are moved to different
+     * groups to improve usability.
+     */
+    QGPGME_DEPRECATED CryptoConfigEntry *entry(const QString &componentName, const QString &groupName, const QString &entryName) const;
 
     /**
      * Write back changes