Utils: Retain more high level information on EnvironmentChange::Item

Change-Id: I78df3cf7ae767d6baeed46f03587ee21875c8315
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/libs/utils/environment.cpp

@@ -433,44 +433,61 @@ optional<EnvironmentProvider> EnvironmentProvider::provider(const QByteArray &id
 
 void EnvironmentChange::addSetValue(const QString &key, const QString &value)
 {
-    m_changeItems.append([key, value](Environment &env) { env.set(key, value); });
+    m_changeItems.append({Item::SetValue, QVariant::fromValue(QPair<QString, QString>(key, value))});
 }
 
 void EnvironmentChange::addUnsetValue(const QString &key)
 {
-    m_changeItems.append([key](Environment &env) { env.unset(key); });
+    m_changeItems.append({Item::UnsetValue, key});
 }
 
 void EnvironmentChange::addPrependToPath(const FilePaths &values)
 {
     for (int i = values.size(); --i >= 0; ) {
         const FilePath value = values.at(i);
-        m_changeItems.append([value](Environment &env) { env.prependOrSetPath(value); });
+        m_changeItems.append({Item::PrependToPath, value.toVariant()});
     }
 }
 
 void EnvironmentChange::addAppendToPath(const FilePaths &values)
 {
     for (const FilePath &value : values)
-        m_changeItems.append([value](Environment &env) { env.appendOrSetPath(value); });
+        m_changeItems.append({Item::AppendToPath, value.toVariant()});
-}
-
-void EnvironmentChange::addModify(const NameValueItems &items)
-{
-    m_changeItems.append([items](Environment &env) { env.modify(items); });
 }
 
 EnvironmentChange EnvironmentChange::fromFixedEnvironment(const Environment &fixedEnv)
 {
     EnvironmentChange change;
-    change.m_changeItems.append([fixedEnv](Environment &env) { env = fixedEnv; });
+    change.m_changeItems.append({Item::SetFixedEnvironment, QVariant::fromValue(fixedEnv)});
     return change;
 }
 
 void EnvironmentChange::applyToEnvironment(Environment &env) const
 {
-    for (const Item &item : m_changeItems)
+    for (const Item &item : m_changeItems) {
-        item(env);
+        switch (item.type) {
+        case Item::SetSystemEnvironment:
+            env = Environment::systemEnvironment();
+            break;
+        case Item::SetFixedEnvironment:
+            env = item.data.value<Environment>();
+            break;
+        case Item::SetValue: {
+            auto data = item.data.value<QPair<QString, QString>>();
+            env.set(data.first, data.second);
+            break;
+        }
+        case Item::UnsetValue:
+            env.unset(item.data.toString());
+            break;
+        case Item::PrependToPath:
+            env.prependOrSetPath(FilePath::fromVariant(item.data));
+            break;
+        case Item::AppendToPath:
+            env.appendOrSetPath(FilePath::fromVariant(item.data));
+            break;
+        }
+    }
 }
 
 } // namespace Utils

src/libs/utils/environment.h

@@ -132,10 +132,24 @@ private:
 class QTCREATOR_UTILS_EXPORT EnvironmentChange final
 {
 public:
-    using Item = std::function<void(Environment &)>;
-
     EnvironmentChange() = default;
 
+    class Item final
+    {
+    public:
+        enum Type {
+            SetSystemEnvironment,
+            SetFixedEnvironment,
+            SetValue,
+            UnsetValue,
+            PrependToPath,
+            AppendToPath,
+        };
+
+        Type type;
+        QVariant data;
+    };
+
     static EnvironmentChange fromFixedEnvironment(const Environment &fixedEnv);
 
     void applyToEnvironment(Environment &) const;
@@ -144,8 +158,6 @@ public:
     void addUnsetValue(const QString &key);
     void addPrependToPath(const FilePaths &values);
     void addAppendToPath(const FilePaths &values);
-    void addModify(const NameValueItems &items);
-    void addChange(const Item &item) { m_changeItems.append(item); }
 
 private:
     QList<Item> m_changeItems;