Replace CMAKE_INSTALL_PREFIX from default config if it hasn't been swapped out by CMAKE

src/openalpr/config.cpp

@@ -167,6 +167,11 @@ namespace alpr
     
     runtimeBaseDir = getString(ini,defaultIni, "", "runtime_dir", DEFAULT_RUNTIME_DATA_DIR);
    
+    // Special hack to allow config files to work if the package hasn't been installed
+    // Cmake will do this replacement on deploy, but this is useful in development
+    if (runtimeBaseDir.find("${CMAKE_INSTALL_PREFIX}") >= 0)
+      runtimeBaseDir = replaceAll(runtimeBaseDir, "${CMAKE_INSTALL_PREFIX}", INSTALL_PREFIX);
+    
     std::string detectorString = getString(ini, defaultIni, "", "detector", "lbpcpu");
     std::transform(detectorString.begin(), detectorString.end(), detectorString.begin(), ::tolower);
 

src/openalpr/utility.cpp

@@ -613,6 +613,15 @@ int levenshteinDistance (const std::string &s1, const std::string &s2, int max)
     return ss.str();
   }
 
+  std::string replaceAll(std::string str, const std::string& from, const std::string& to) {
+    size_t start_pos = 0;
+    while((start_pos = str.find(from, start_pos)) != std::string::npos) {
+        str.replace(start_pos, from.length(), to);
+        start_pos += to.length(); // Handles case where 'to' is a substring of 'from'
+    }
+    return str;
+  }
+
 // trim from start
   std::string &ltrim(std::string &s) {
     s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<int, int>(std::isspace))));

src/openalpr/utility.h

@@ -115,6 +115,8 @@ namespace alpr
   std::string toString(float value);
   std::string toString(double value);
 
+  std::string replaceAll(std::string str, const std::string& from, const std::string& to);
+  
   std::string &ltrim(std::string &s);
   std::string &rtrim(std::string &s);
   std::string &trim(std::string &s);