utils: Add Mu::canonicalize_filename

We need it for unit-tests

lib/utils/mu-util.c

@@ -532,7 +532,7 @@ mu_util_read_password (const char *prompt)
  */
 gchar *
 mu_canonicalize_filename (const gchar *filename,
-                         const gchar *relative_to)
+			  const gchar *relative_to)
 {
   gchar *canon, *start, *p, *q;
   guint i;

lib/utils/mu-utils.cc

@@ -33,7 +33,7 @@
 #include <glib/gprintf.h>
 
 #include "mu-utils.hh"
-
+#include "mu-util.h"
 
 using namespace Mu;
 
@@ -447,6 +447,21 @@ Mu::size_to_string (const std::string& val, bool is_first)
 	return str;
 }
 
+
+std::string
+Mu::canonicalize_filename(const std::string& path, const std::string& relative_to)
+{
+        char *fname = mu_canonicalize_filename (
+                path.c_str(),
+                relative_to.empty() ? NULL : relative_to.c_str());
+
+        std::string rv{fname};
+        g_free (fname);
+
+        return rv;
+}
+
+
 void
 Mu::assert_equal(const std::string& s1, const std::string& s2)
 {

lib/utils/mu-utils.hh

@@ -131,6 +131,16 @@ constexpr int64_t to_s  (Duration d) { return to_unit<std::chrono::seconds>(d);
 constexpr int64_t to_ms (Duration d) { return to_unit<std::chrono::milliseconds>(d); }
 constexpr int64_t to_us (Duration d) { return to_unit<std::chrono::microseconds>(d); }
 
+/**
+ * See g_canonicalize_filename
+ *
+ * @param filename
+ * @param relative_to
+ *
+ * @return
+ */
+std::string canonicalize_filename(const std::string& path, const std::string& relative_to);
+
 /**
  * Convert a size string to a size in bytes
  *
@@ -205,8 +215,6 @@ private:
         const bool color_;
 };
 
-
-
 /**
  *
  * don't repeat these catch blocks everywhere...