Add Parameter short name support, used in LV2 and VST

Closes #163

Signed-off-by: falkTX <falktx@falktx.com>

distrho/DistrhoPlugin.hpp

@@ -384,6 +384,13 @@ struct Parameter {
     */
     String name;
 
+   /**
+      The short name of this parameter.@n
+      Used when displaying the parameter name in a very limited space.
+      @note This value is optional, the full name is used when the short one is missing.
+    */
+    String shortName;
+
    /**
       The symbol of this parameter.@n
       A parameter symbol is a short restricted name used as a machine and human readable identifier.@n
@@ -430,6 +437,7 @@ struct Parameter {
     Parameter() noexcept
         : hints(0x0),
           name(),
+          shortName(),
           symbol(),
           unit(),
           ranges(),
@@ -443,6 +451,7 @@ struct Parameter {
     Parameter(uint32_t h, const char* n, const char* s, const char* u, float def, float min, float max) noexcept
         : hints(h),
           name(n),
+          shortName(),
           symbol(s),
           unit(u),
           ranges(def, min, max),
@@ -462,11 +471,12 @@ struct Parameter {
         case kParameterDesignationNull:
             break;
         case kParameterDesignationBypass:
-            hints  = kParameterIsAutomable|kParameterIsBoolean|kParameterIsInteger;
-            name   = "Bypass";
-            symbol = "dpf_bypass";
-            unit   = "";
-            midiCC = 0;
+            hints      = kParameterIsAutomable|kParameterIsBoolean|kParameterIsInteger;
+            name       = "Bypass";
+            shortName  = "Bypass";
+            symbol     = "dpf_bypass";
+            unit       = "";
+            midiCC     = 0;
             ranges.def = 0.0f;
             ranges.min = 0.0f;
             ranges.max = 1.0f;

distrho/src/DistrhoPluginInternal.hpp

@@ -375,6 +375,13 @@ public:
         return fData->parameters[index].name;
     }
 
+    const String& getParameterShortName(const uint32_t index) const noexcept
+    {
+        DISTRHO_SAFE_ASSERT_RETURN(fData != nullptr && index < fData->parameterCount, sFallbackString);
+
+        return fData->parameters[index].shortName;
+    }
+
     const String& getParameterSymbol(const uint32_t index) const noexcept
     {
         DISTRHO_SAFE_ASSERT_RETURN(fData != nullptr && index < fData->parameterCount, sFallbackString);

distrho/src/DistrhoPluginLV2export.cpp

@@ -440,6 +440,12 @@ void lv2_generate_ttl(const char* const basename)
 
                     pluginString += "        lv2:symbol \"" + symbol + "\" ;\n";
 
+                    // short name
+                    const String& shortName(plugin.getParameterShortName(i));
+
+                    if (shortName.isNotEmpty())
+                        pluginString += "        lv2:shortName \"" + shortName + "\" ;\n";
+
                     // ranges
                     const ParameterRanges& ranges(plugin.getParameterRanges(i));
 

distrho/src/DistrhoPluginVST.cpp

@@ -1294,7 +1294,11 @@ static intptr_t vst_dispatcherCallback(AEffect* effect, int32_t opcode, int32_t
     case effGetParamName:
         if (ptr != nullptr && index < static_cast<int32_t>(plugin.getParameterCount()))
         {
-            DISTRHO_NAMESPACE::strncpy((char*)ptr, plugin.getParameterName(index), 16);
+            const String& shortName(plugin.getParameterShortName(index));
+            if (shortName.isNotEmpty())
+                DISTRHO_NAMESPACE::strncpy((char*)ptr, shortName, 16);
+            else
+                DISTRHO_NAMESPACE::strncpy((char*)ptr, plugin.getParameterName(index), 16);
             return 1;
         }
         return 0;