Add ifversion

This command adds `ifversion`, as both a simplified and internal
command.

The system works like so:

- `ifversion(2.6,script2)` -> If you're on 2.6.0 or greater
- `ifversion(2.6.0,script2)` -> Same as above
- `ifversion(2.6.3,script2)` -> You're using 2.6.3 or greater
- `ifversion(2.5,script2)` -> You're using 2.5 or greater
- `ifversion(2,script2)` -> You're using 2.0.0 or greater (yep...)

`ReleaseVersion.h` has a few new defines to make this possible, being
`MAJOR_VERSION`, `MINOR_VERSION` and `PATCH_VERSION`. With the help of
a few macros, `RELEASE_VERSION` is now constructed using those.

desktop_version/src/ReleaseVersion.h

@@ -1,6 +1,17 @@
 #ifndef RELEASEVERSION_H
 #define RELEASEVERSION_H
 
-#define RELEASE_VERSION "v2.5"
+#define MAJOR_VERSION 2
+#define MINOR_VERSION 5
+#define PATCH_VERSION 0
+
+#define VVV_STRINGIFY(x) #x
+#define VVV_TOSTRING(x) VVV_STRINGIFY(x)
+
+#if PATCH_VERSION == 0
+#define RELEASE_VERSION "v" VVV_TOSTRING(MAJOR_VERSION) "." VVV_TOSTRING(MINOR_VERSION)
+#else
+#define RELEASE_VERSION "v" VVV_TOSTRING(MAJOR_VERSION) "." VVV_TOSTRING(MINOR_VERSION) "." VVV_TOSTRING(PATCH_VERSION)
+#endif
 
 #endif /* RELEASEVERSION_H */

desktop_version/src/Script.cpp

@@ -20,6 +20,7 @@
 #include "LocalizationStorage.h"
 #include "Map.h"
 #include "Music.h"
+#include "ReleaseVersion.h"
 #include "Unreachable.h"
 #include "UtilityClass.h"
 #include "VFormat.h"
@@ -338,6 +339,67 @@ void scriptclass::run(void)
                     }
                 }
             }
+            if (words[0] == "ifversion")
+            {
+                // A short for each is SURELY enough
+                unsigned short version[3] = { 0, 0, 0 };
+                bool valid_version = true;
+                int current = 0;
+
+                // Crawl through the string
+                for (int i = 0; i < words[1].size(); i++)
+                {
+                    // If the current character is a number, add it to the current version part
+                    if (words[1][i] >= '0' && words[1][i] <= '9')
+                    {
+                        version[current] = version[current] * 10 + (words[1][i] - '0');
+                    }
+                    else if (words[1][i] == '.')
+                    {
+                        current++;
+                        if (current >= 3)
+                        {
+                            break;
+                        }
+                    }
+                    else
+                    {
+                        // Unexpected character
+                        valid_version = false;
+                        break;
+                    }
+                }
+
+                if (valid_version)
+                {
+                    bool version_is_met = false;
+
+                    if (MAJOR_VERSION > version[0])
+                    {
+                        version_is_met = true;
+                    }
+                    else if (MAJOR_VERSION == version[0])
+                    {
+                        if (MINOR_VERSION > version[1])
+                        {
+                            version_is_met = true;
+                        }
+                        else if (MINOR_VERSION == version[1])
+                        {
+                            if (PATCH_VERSION >= version[2])
+                            {
+                                version_is_met = true;
+                            }
+                        }
+                    }
+
+                    if (version_is_met)
+                    {
+                        loadalts("custom_" + words[2], "custom_" + raw_words[2]);
+                        position--;
+                    }
+                }
+            }
             if (words[0] == "customiftrinkets")
             {
                 if (game.trinkets() >= ss_toi(words[1]))
@@ -3574,6 +3636,9 @@ bool scriptclass::loadcustom(const std::string& t)
         }else if(words[0] == "iftrinketsless"){
             if(customtextmode==1){ add("endtext"); customtextmode=0;}
             add("custom"+lines[i]);
+        }else if(words[0] == "ifversion"){
+            if(customtextmode==1){ add("endtext"); customtextmode=0;}
+            add(lines[i]);
         }else if(words[0] == "textcase"){
             if(customtextmode==1){ add("endtext"); customtextmode=0;}
             add(lines[i]);