linux-kernel - [PATCH] kconfig: ask for saving configuration before quitting when something changed

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Date:	Sat, 21 Oct 2006 11:59:26 +0200
From:	"Marco Costalba" <mcostalba@...il.com>
To:	sam@...nborg.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] kconfig: ask for saving configuration before quitting when something changed

This clears a TODO

Signed-off-by: Marco Costalba <mcostalba@...il.com>
---
 scripts/kconfig/qconf.cc |   59 +++++++++++++++++++++++++++++++++++++++++++--
 scripts/kconfig/qconf.h  |   13 ++++++++++
 2 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index eec81b0..6f4c360 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -37,6 +37,26 @@ #endif

 static QApplication *configApp;
 static ConfigSettings *configSettings;
+static QMap<struct symbol*, SymValue> touchedSyms;
+
+static void aboutToChange(struct symbol* sym)
+{
+	if (sym && !touchedSyms.contains(sym)) {
+		SymValue originalValue(sym);
+		touchedSyms.insert(sym, originalValue);
+	}
+}
+
+static bool isSomethingChanged()
+{
+	QMap<struct symbol*, SymValue>::Iterator it;
+	for (it = touchedSyms.begin(); it != touchedSyms.end(); ++it) {
+		SymValue curVal(it.key());
+		if (curVal != it.data())
+			return true;
+	}
+	return false;
+}

 static inline QString qgettext(const char* str)
 {
@@ -48,6 +68,33 @@ static inline QString qgettext(const QSt
 	return QString::fromLocal8Bit(gettext(str.latin1()));
 }

+bool SymValue::operator!=(const SymValue& v)
+{
+	if (v.type != type)
+		return true;
+
+	if (type == S_BOOLEAN || type == S_TRISTATE)
+		return v.expr != expr;
+
+	return v.data != data;
+}
+
+void SymValue::readValue(struct symbol* sym)
+{
+	type = sym_get_type(sym);
+	switch (type) {
+	case S_BOOLEAN:
+	case S_TRISTATE:
+		expr = sym_get_tristate_value(sym);
+		break;
+	case S_INT:
+	case S_HEX:
+	case S_STRING:
+		data = sym_get_string_value(sym);
+		break;
+	}
+}
+
 /**
  * Reads a list of integer values from the application settings.
  */
@@ -86,6 +133,7 @@ #if QT_VERSION >= 300
 void ConfigItem::okRename(int col)
 {
 	Parent::okRename(col);
+	aboutToChange(menu->sym);
 	sym_set_string_value(menu->sym, text(dataColIdx).latin1());
 }
 #endif
@@ -298,6 +346,7 @@ void ConfigLineEdit::keyPressEvent(QKeyE
 		break;
 	case Key_Return:
 	case Key_Enter:
+		aboutToChange(item->menu->sym);
 		sym_set_string_value(item->menu->sym, text().latin1());
 		parent()->updateList(item);
 		break;
@@ -469,7 +518,7 @@ void ConfigList::setValue(ConfigItem* it
 	case S_BOOLEAN:
 	case S_TRISTATE:
 		oldval = sym_get_tristate_value(sym);
-
+		aboutToChange(sym);
 		if (!sym_set_tristate_value(sym, val))
 			return;
 		if (oldval == no && item->menu->list)
@@ -500,6 +549,7 @@ void ConfigList::changeValue(ConfigItem*
 	case S_BOOLEAN:
 	case S_TRISTATE:
 		oldexpr = sym_get_tristate_value(sym);
+		aboutToChange(sym);
 		newexpr = sym_toggle_tristate_value(sym);
 		if (item->menu->list) {
 			if (oldexpr == newexpr)
@@ -1442,6 +1492,8 @@ void ConfigMainWindow::saveConfig(void)
 {
 	if (conf_write(NULL))
 		QMessageBox::information(this, "qconf", "Unable to save configuration!");
+	else
+		touchedSyms.clear();
 }

 void ConfigMainWindow::saveConfigAs(void)
@@ -1451,6 +1503,8 @@ void ConfigMainWindow::saveConfigAs(void
 		return;
 	if (conf_write(QFile::encodeName(s)))
 		QMessageBox::information(this, "qconf", "Unable to save configuration!");
+	else
+		touchedSyms.clear();
 }

 void ConfigMainWindow::searchConfig(void)
@@ -1583,11 +1637,10 @@ void ConfigMainWindow::showFullView(void

 /*
  * ask for saving configuration before quitting
- * TODO ask only when something changed
  */
 void ConfigMainWindow::closeEvent(QCloseEvent* e)
 {
-	if (!sym_change_count) {
+	if (!isSomethingChanged()) {
 		e->accept();
 		return;
 	}
diff --git a/scripts/kconfig/qconf.h b/scripts/kconfig/qconf.h
index 8d11f3c..8617698 100644
--- a/scripts/kconfig/qconf.h
+++ b/scripts/kconfig/qconf.h
@@ -45,6 +45,19 @@ enum listMode {
 	singleMode, menuMode, symbolMode, fullMode, listMode
 };

+class SymValue {
+public:
+	SymValue() {}; // QMap needs this to store us
+	SymValue(struct symbol* sym) { readValue(sym); }
+	bool operator!=(const SymValue&);
+private:
+	void readValue(struct symbol* sym);
+
+	int type;
+	tristate expr;
+	QString data;
+};
+
 class ConfigList : public QListView {
 	Q_OBJECT
 	typedef class QListView Parent;
-- 
1.4.3.ge193
-
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