Validate installed fpcalc version

ConfusedPolarBear.Plugin.IntroSkipper/FPCalc.cs

@@ -14,6 +14,11 @@ namespace ConfusedPolarBear.Plugin.IntroSkipper;
 /// </summary>
 public static class FPCalc
 {
+    /// <summary>
+    /// Minimum fpcalc version that can be used.
+    /// </summary>
+    private static Version minimumFPCalcVersion = new Version(1, 4, 3);
+
     /// <summary>
     /// Gets or sets the logger.
     /// </summary>
@@ -27,9 +32,29 @@ public static class FPCalc
     {
         try
         {
-            var version = GetOutput("-version", 2000);
+            var rawVersion = GetOutput("-version", 2000).TrimEnd();
-            Logger?.LogDebug("fpcalc version: {Version}", version);
+            if (!rawVersion.StartsWith("fpcalc version", StringComparison.OrdinalIgnoreCase))
-            return version.StartsWith("fpcalc version", StringComparison.OrdinalIgnoreCase);
+            {
+                return false;
+            }
+
+            Logger?.LogDebug("raw fpcalc version: {Version}", rawVersion);
+
+            var version = Version.Parse(rawVersion.AsSpan(15));
+
+            Logger?.LogDebug("Found fpcalc version {Version}", version);
+
+            var okay = version >= minimumFPCalcVersion;
+
+            if (!okay)
+            {
+                Logger?.LogError(
+                    "installed fpcalc version of {Version} is too old (minimum is {Minimum})",
+                    version,
+                    minimumFPCalcVersion);
+            }
+
+            return okay;
         }
         catch
         {