3 files changed, 34 insertions, 5 deletions
diff --git a/utils/gen_adldata/gen_adldata.cc b/utils/gen_adldata/gen_adldata.cc
index 45f0c7c..375ea79 100644
--- a/utils/gen_adldata/gen_adldata.cc
+++ b/utils/gen_adldata/gen_adldata.cc
@@ -210,6 +210,7 @@ int main(int argc, char**argv)
     }
 
     MeasureThreaded measureCounter;
+    bool dontOverride = false;
 
     {
         measureCounter.LoadCache("fm_banks/adldata-cache.dat");
@@ -225,10 +226,22 @@ int main(int argc, char**argv)
         }
         std::fflush(stdout);
         measureCounter.waitAll();
-        measureCounter.SaveCache("fm_banks/adldata-cache.dat");
+        if(measureCounter.m_cache_matches != measureCounter.m_total)
+        {
+            std::printf("-- Cache data was changed, saving...\n");
+            std::fflush(stdout);
+            measureCounter.SaveCache("fm_banks/adldata-cache.dat");
+            dontOverride = false;
+        }
+        else
+        {
+            std::printf("-- Cache data was not changes.\n");
+            std::fflush(stdout);
+            dontOverride = true;
+        }
     }
 
-    db.exportBanks(std::string(outFile_s));
+    db.exportBanks(std::string(outFile_s), dontOverride);
 
     std::printf("Generation of ADLMIDI data has been completed!\n");
     std::fflush(stdout);
diff --git a/utils/gen_adldata/progs_cache.cpp b/utils/gen_adldata/progs_cache.cpp
index 60518ba..72e1fbc 100644
--- a/utils/gen_adldata/progs_cache.cpp
+++ b/utils/gen_adldata/progs_cache.cpp
@@ -129,9 +129,23 @@ void BanksDump::addInstrument(BanksDump::MidiBank &bank, size_t patchId,
     bank.instruments[patchId] = static_cast<int_fast32_t>(e.instId);
 }
 
-void BanksDump::exportBanks(const std::string &outPath, const std::string &headerName)
+void BanksDump::exportBanks(const std::string &outPath, bool donntOverride, const std::string &headerName)
 {
-    FILE *out = std::fopen(outPath.c_str(), "w");
+    FILE *out;
+
+    // Check if file exist
+    if(donntOverride)
+    {
+        out = std::fopen(outPath.c_str(), "r");
+        if(out)
+        {
+            // File exist, don't override it
+            std::fclose(out);
+            return;
+        }
+    }
+
+    out = std::fopen(outPath.c_str(), "w");
 
     std::fprintf(out, "/**********************************************************\n"
                       "    This file is generated by `gen_adldata` automatically\n"
diff --git a/utils/gen_adldata/progs_cache.h b/utils/gen_adldata/progs_cache.h
index 668c253..5193b1d 100644
--- a/utils/gen_adldata/progs_cache.h
+++ b/utils/gen_adldata/progs_cache.h
@@ -308,7 +308,9 @@ struct BanksDump
     size_t initBank(size_t bankId, const std::string &title, uint_fast16_t bankSetup);
     void addMidiBank(size_t bankId, bool percussion, MidiBank b);
     void addInstrument(MidiBank &bank, size_t patchId, InstrumentEntry e, Operator *ops, const std::string &meta = std::string());
-    void exportBanks(const std::string &outPath, const std::string &headerName = "adlmidi_db.h");
+    void exportBanks(const std::string &outPath,
+                     bool donntOverride,
+                     const std::string &headerName = "adlmidi_db.h");
 };