Add tests and update documentation for the kconfig plugin

doc/news/_preparation_next_release.md

@@ -89,6 +89,7 @@ plugins. _(René Schwaiger)_
 ### KConfig
 
 - We added a plugin which can be used to parse kconfig ini files into a keyset and save keysets to such files. _(Dardan Haxhimustafa)_
+- We implemented the methods that save a KeySet into a file with the KConfig Ini format. _(Dardan Haxhimustafa)_
 
 ### Mmapstorage
 

src/plugins/kconfig/README.md

@@ -7,11 +7,12 @@
 - infos/placements = getstorage setstorage
 - infos/status = recommended maintained compatible specific experimental unfinished nodoc concept
 - infos/metadata =
-- infos/description = Reads the KConfig INI format
+- infos/description = Reads and writes the KConfig INI format
 
 ## Introduction
 
-This plugin can be used to parse a [KConfig](https://cgit.kde.org/kconfig.git) INI file into a KeySet.
+This plugin can be used to parse a [KConfig](https://cgit.kde.org/kconfig.git) INI file into a KeySet, and also write a KeySet to a file in 
+such a format.
 
 Information about the syntax:
 
@@ -73,6 +74,14 @@ echo 'key=Value' > `kdb file /tests/kconfig`
 kdb get /tests/kconfig/key
 #> Value
 
+# Set the value to Example
+kdb set /tests/kconfig/key Example
+#> Set string to "Example"
+
+# Verify that the value has changed in the file too
+cat `kdb file /tests/kconfig`
+#> key=Example
+
 # Manually add a gorup to the database
 echo '[group][subgroup]' >> `kdb file /tests/kconfig`
 

src/plugins/kconfig/testmod_kconfig.cpp

@@ -9,6 +9,7 @@
 
 #include "kconfig.hpp"
 
+#include <fstream>
 #include <kdbmodule.h>
 #include <kdbprivate.h>
 
@@ -81,7 +82,7 @@ TEST (kconfig, basics)
 
 	succeed_if_same (plugin->kdbGet (plugin, keys.getKeySet (), *parent), ELEKTRA_PLUGIN_STATUS_SUCCESS, "Call of `kdbGet` failed");
 
-	succeed_if_same (plugin->kdbSet (plugin, keys.getKeySet (), *parent), ELEKTRA_PLUGIN_STATUS_NO_UPDATE, "Call of `kdbSet` failed");
+	succeed_if_same (plugin->kdbSet (plugin, keys.getKeySet (), *parent), ELEKTRA_PLUGIN_STATUS_ERROR, "Call of `kdbSet` failed");
 
 	succeed_if_same (plugin->kdbError (plugin, keys.getKeySet (), *parent), ELEKTRA_PLUGIN_STATUS_SUCCESS, "Call of `kdbError` failed");
 
@@ -99,6 +100,52 @@ TEST (kconfig, simple_file_get)
 	);
 }
 
+TEST (kconfig, simple_file_set)
+{
+	// LOAD KConfig module
+	CppKeySet modules{ 0, KS_END };
+	CppKeySet config{ 0, KS_END };
+	CppKey pluginParent{ "system/elektra/modules/kconfig", KEY_END };
+	elektraModulesInit (modules.getKeySet (), 0);
+	Plugin * plugin = elektraPluginOpen ("kconfig", modules.getKeySet (), config.getKeySet (), pluginParent.getKey());
+	exit_if_fail (plugin != NULL, "Could not open kconfig plugin"); //! OCLint (empty if, too few branches switch)
+
+	// Create parent key
+	string filePath = elektraFilename ();
+	CppKey parent{ "user/namespace", KEY_END };
+	parent.setString (filePath);
+
+	// Create KeySet that we want to save
+	CppKey key1{ "user/namespace/group/title", KEY_VALUE, "KConfig Test", KEY_END };
+	CppKey key2{ "user/namespace/group/key[en]", KEY_VALUE, "Hello", KEY_META, "kconfig", "ei", KEY_END };
+	CppKey key3{ "user/namespace/group/key[de]", KEY_VALUE, "Hallo", KEY_END };
+	CppKeySet keys;
+	keys.append (key1);
+	keys.append (key2);
+	keys.append (key3);
+
+
+	// Save the KeySet to the file stored in the parent key
+	succeed_if_same (plugin->kdbSet (plugin, keys.getKeySet (), parent.getKey()), ELEKTRA_PLUGIN_STATUS_SUCCESS, "Call of `kdbSet` failed");
+
+
+	// Load the file and verify that it has the correct format
+	std::ifstream file {filePath};
+	std::string tmp;
+
+	getline (file, tmp);
+	succeed_if_same (tmp, "[group]", "");
+	getline (file, tmp);
+	succeed_if_same (tmp, "key[de]=Hallo", "");
+	getline (file, tmp);
+	succeed_if_same (tmp, "key[en][$e][$i]=Hello", "");
+	getline (file, tmp);
+	succeed_if_same (tmp, "title=KConfig Test", "");
+
+	file.close();
+
+}
+
 TEST (kconfig, meta_file_get)
 {
 	test_read ("kconfig/meta_examplerc",