core: make command texts available for C code

Create a C string (which the caller needs to free) with the executed commands
in this session.

The detour via the callback allows us to not make the corelib depend on the
commands, which is nice for tests, export-html, and smtk2ssrf.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

3 files changed, 19 insertions, 2 deletions

diff --git a/commands/command_base.cpp b/commands/command_base.cpp
index 1f924378b..d13daf269 100644
--- a/commands/command_base.cpp
+++ b/commands/command_base.cpp
@@ -8,10 +8,14 @@ namespace Command {
 
 static QUndoStack undoStack;
 
+// forward declaration
+QString changesMade();
+
 // General commands
 void init()
 {
 	QObject::connect(&undoStack, &QUndoStack::cleanChanged, &updateWindowTitle);
+	changesCallback = &changesMade;
 }
 
 void clear()
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index b00201297..05612a4ce 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -46,7 +46,7 @@ static QLocale loc;
 
 static inline QString degreeSigns()
 {
-    return QStringLiteral("dD\u00b0");
+	return QStringLiteral("dD\u00b0");
 }
 
 QString weight_string(int weight_in_grams)
@@ -1644,3 +1644,14 @@ char *copy_qstring(const QString &s)
 {
 	return strdup(qPrintable(s));
 }
+
+// function to call to get changes for a git commit
+QString (*changesCallback)() = nullptr;
+
+extern "C" char *get_changes_made()
+{
+	if (changesCallback != nullptr)
+		return copy_qstring(changesCallback());
+	else
+		return nullptr;
+}
diff --git a/core/qthelper.h b/core/qthelper.h
index 4c3a6aa19..c91712716 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -83,6 +83,8 @@ QVector<QPair<QString, int>> selectedDivesGasUsed();
 QString getUserAgent();
 QString printGPSCoords(const location_t *loc);
 
+extern QString (*changesCallback)();
+
 #if defined __APPLE__
 #define TITLE_OR_TEXT(_t, _m) "", _t + "\n" + _m
 #else
@@ -150,7 +152,7 @@ depth_t string_to_depth(const char *str);
 pressure_t string_to_pressure(const char *str);
 volume_t string_to_volume(const char *str, pressure_t workp);
 fraction_t string_to_fraction(const char *str);
-
+char *get_changes_made();
 #ifdef __cplusplus
 }
 #endif