Finalize cleanup of warning messages

include/cantera/base/global.h

@@ -194,14 +194,18 @@ void _warn_user(const std::string& method, const std::string& extra);
  * Print a user warning raised from *method*.
  *
  * @param method  method name
- * @param msg  C format string for the following arguments
- * @param args  arguments used to interpolate the format string
+ * @param msg  Python-style format string with the following arguments
+ * @param args  arguments for the format string
  */
 template <typename... Args>
 void warn_user(const std::string& method, const std::string& msg,
                const Args&... args) {
+    if (sizeof...(args) == 0) {
+        _warn_user(method, msg);
+    } else {
         _warn_user(method, fmt::format(msg, args...));
     }
+}
 
 //! @copydoc Application::make_deprecation_warnings_fatal
 void make_deprecation_warnings_fatal();

src/base/application.cpp

@@ -170,14 +170,14 @@ void Application::warn_deprecated(const std::string& method,
         return;
     }
     warnings.insert(method);
-    writelog("DeprecationWarning: '" + method + "': " + extra);
+    writelog(fmt::format("DeprecationWarning: {}: {}", method, extra));
     writelogendl();
 }
 
 void Application::warn_user(const std::string& method,
                             const std::string& extra)
 {
-    writelog("UserWarning: '" + method + "': " + extra);
+    writelog(fmt::format("CanteraWarning: {}: {}", method, extra));
     writelogendl();
 }
 

src/kinetics/Falloff.cpp

@@ -45,7 +45,13 @@ void Troe::init(const vector_fp& c)
 
     if (c.size() == 4) {
         if (std::abs(c[3]) < SmallNumber) {
-            warn_user("Troe::init", "Zero T2 value is suppressed.");
+            warn_user("Troe::init",
+                "Unexpected parameter value T2=0. Omitting exp(T2/T) term from "
+                "falloff expression. To suppress this warning, remove value "
+                "for T2 from the input file. In the unlikely case that the "
+                "exp(T2/T) term should be included with T2 effectively equal "
+                "to 0, set T2 to a sufficiently small value "
+                "(i.e. T2 < 1e-16).");
         }
         m_t2 = c[3];
     }

src/thermo/PDSS_HKFT.cpp

@@ -314,7 +314,7 @@ void PDSS_HKFT::initThermo()
                 " not consistent with G and S: {} vs {} cal gmol-1",
                 sname, Hcalc/toSI("cal/gmol"), m_deltaH_formation_tr_pr);
         } else {
-            warn_user("PDSS_HKFT::initThermo()",
+            warn_user("PDSS_HKFT::initThermo",
                 "DHjmol for {} is not consistent with G and S: calculated {} "
                 "vs input {} cal gmol-1; continuing with consistent DHjmol = {}",
                 sname, Hcalc/toSI("cal/gmol"), m_deltaH_formation_tr_pr,

test_problems/cxx_ex/output_blessed.txt

@@ -40,32 +40,32 @@ Description:
 Chemical equilibrium.
 Equilibrium composition and pressure for a range of temperatures at constant density.
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI2H6, discontinuity in h/RT detected at Tmid = 1000
         Value computed using low-temperature polynomial:  19.8328
         Value computed using high-temperature polynomial: 19.9055
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI2H6, discontinuity in s/R detected at Tmid = 1000
         Value computed using low-temperature polynomial:  49.5493
         Value computed using high-temperature polynomial: 49.7214
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI3H8, discontinuity in h/RT detected at Tmid = 1000
         Value computed using low-temperature polynomial:  29.3028
         Value computed using high-temperature polynomial: 29.4297
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI3H8, discontinuity in s/R detected at Tmid = 1000
         Value computed using low-temperature polynomial:  65.9731
         Value computed using high-temperature polynomial: 66.2781
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI2, discontinuity in h/RT detected at Tmid = 1000
         Value computed using low-temperature polynomial:  74.0115
         Value computed using high-temperature polynomial: 74.0387
 
-UserWarning: 'NasaPoly2::validate': 
+CanteraWarning: NasaPoly2::validate:
 For species SI2, discontinuity in s/R detected at Tmid = 1000
         Value computed using low-temperature polynomial:  32.8813
         Value computed using high-temperature polynomial: 32.9489