Creation of svg images for formulas with inkscape

Based on the implementation as mentioned in #7578 to add the possibilities to generated svg images for formulas

- When running with inkscape 92.3 / 92.4 on Cygwin /Windows there were no images generated as the `-o` flag didn't exist, the output file had to be specified as part of the `-l`  (or `--export-plain-svg`) option
- For more flexibility the system is checked on existence of the `pdf2svg` and `inkscape` executables, so no compilations flags are necessary

1 files changed, 13 insertions, 1 deletions

diff --git a/src/portable.cpp b/src/portable.cpp
index 8ceb7d6..8c941b6 100644
--- a/src/portable.cpp
+++ b/src/portable.cpp
@@ -348,7 +348,6 @@ char  Portable::pathListSeparator(void)
 #endif
 }
 
-#if defined(_WIN32) && !defined(__CYGWIN__)
 static const bool ExistsOnPath(const char *fileName)
 {
   QFileInfo fi1(fileName);
@@ -380,7 +379,20 @@ static const bool ExistsOnPath(const char *fileName)
   }
   return false;
 }
+
+const bool Portable::checkForExecutable(const char *fileName)
+{
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  char *extensions[] = {".bat",".com",".exe"};
+  for (int i = 0; i < sizeof(extensions) / sizeof(*extensions); i++)
+  {
+    if (ExistsOnPath(QCString(fileName) + extensions[i])) return true;
+  }
+  return false;
+#else
+  return ExistsOnPath(fileName);
 #endif
+}
 
 const char *Portable::ghostScriptCommand(void)
 {