Add support for download config overrides

- Add Linux ARM builds for 4.2 beta5 and later
- Add an override for previous releases to remove Linux ARM builds.
- Add an override for early 4.0 alphas to remove non-existent .NET builds.

_data/download_configs.yml

@@ -5,6 +5,8 @@ defaults:
       android.apk: android_editor.apk
       linux.64: linux.x86_64.zip
       linux.32: linux.x86_32.zip
+      linux.arm64: linux.arm64.zip
+      linux.arm32: linux.arm32.zip
       macos.universal: macos.universal.zip
       windows.64: win64.exe.zip
       windows.32: win32.exe.zip
@@ -17,6 +19,8 @@ defaults:
       editor:
         linux.64: mono_linux_x86_64.zip
         linux.32: mono_linux_x86_32.zip
+        linux.arm64: mono_linux_arm64.zip
+        linux.arm32: mono_linux_arm32.zip
         macos.universal: mono_macos.universal.zip
         windows.64: mono_win64.zip
         windows.32: mono_win32.zip
@@ -68,3 +72,49 @@ defaults:
       windows.64: win64.exe.zip
       windows.32: win32.exe.zip
       linux_server.64: linux_server.64.zip
+
+overrides:
+  # Mono version of Godot 4 was only introduced in 4.0 alpha 17.
+  - version: 4
+    range:
+      - "4.0-alpha1"
+      - "4.0-alpha16"
+    config:
+      templates: export_templates.tpz
+      editor:
+        android.apk: android_editor.apk
+        linux.64: linux.x86_64.zip
+        linux.32: linux.x86_32.zip
+        macos.universal: macos.universal.zip
+        windows.64: win64.exe.zip
+        windows.32: win32.exe.zip
+        web: web_editor.zip
+      extras:
+        aar_library: template_release.aar
+
+  # Godot 4.2 beta 5 introduced Linux ARM builds.
+  - version: 4
+    range:
+      - "4.0-alpha17"
+      - "4.2-beta4"
+    config:
+      templates: export_templates.tpz
+      editor:
+        android.apk: android_editor.apk
+        linux.64: linux.x86_64.zip
+        linux.32: linux.x86_32.zip
+        macos.universal: macos.universal.zip
+        windows.64: win64.exe.zip
+        windows.32: win32.exe.zip
+        web: web_editor.zip
+      extras:
+        aar_library: template_release.aar
+
+      mono:
+        templates: mono_export_templates.tpz
+        editor:
+          linux.64: mono_linux_x86_64.zip
+          linux.32: mono_linux_x86_32.zip
+          macos.universal: mono_macos.universal.zip
+          windows.64: mono_win64.zip
+          windows.32: mono_win32.zip

_data/download_platforms.yml

@@ -40,6 +40,20 @@
   tags:
     - 64 bit
 
+- name: "linux.arm32"
+  title: "Linux"
+  caption: "Standard (ARM32)"
+  tags:
+    - ARM32
+    - 32 bit
+
+- name: "linux.arm64"
+  title: "Linux"
+  caption: "Standard (ARM64)"
+  tags:
+    - ARM64
+    - 64 bit
+
 - name: "linux_server.64"
   title: "Linux Server"
   caption: "Standard (x86_64)"

_plugins/make_download.rb

@@ -6,6 +6,14 @@ HOST_TUXFAMILY = "https://downloads.tuxfamily.org/godotengine"
 HOST_GITHUB = "https://github.com/godotengine/godot/releases/download"
 HOST_GITHUB_BUILDS = "https://github.com/godotengine/godot-builds/releases/download"
 
+FLAVOR_MATRIX = {
+  "dev"    => 1,
+  "alpha"  => 2,
+  "beta"   => 3,
+  "rc"     => 4,
+  "stable" => 10
+}
+
 module MakeDownloadFilter
   # Input should be a value from versions.yml or the output of make_release_version().
   def get_download_platforms(input, mono = false)
@@ -157,6 +165,92 @@ module MakeDownloadFilter
       return input.key?("release_version") ? input["release_version"] : input["name"]
   end
 
+  def parse_version_string(version_string)
+    string_bits = version_string.split("-")
+
+    version_bits = parse_version_name(string_bits[0])
+    flavor_bits = parse_version_flavor(string_bits[1])
+
+    return [ version_bits, flavor_bits ]
+  end
+
+  def parse_version_name(version_name)
+    parsed_version = [ 0, 0, 0, 0 ]
+    version_bits = version_name.split(".")
+
+    parsed_version.each_with_index do |value, index|
+      if version_bits[index] != nil
+        parsed_version[index] = version_bits[index].to_i
+      end
+    end
+
+    return parsed_version
+  end
+
+  def parse_version_flavor(version_flavor)
+    flavor_name = version_flavor
+    flavor_number = 0
+
+    match = /([0-9]+)$/.match(version_flavor)
+    if match != nil
+      match_offset = match.offset(0)
+
+      flavor_name = version_flavor[0, match_offset[0]]
+      flavor_number = version_flavor[match_offset[0], match_offset[1] - match_offset[0]].to_i
+    end
+
+    return [ flavor_name, flavor_number ]
+  end
+
+  def get_version_bits_hash(version_bits)
+    hash = 0
+
+    # We assume no part of the Godot version string can be above 99,
+    # but we also assume that values above 9 are possible.
+    version_bits.each_with_index do |bit, index|
+      pow_index = version_bits.size - index
+      pow_value = 100 ** pow_index
+
+      hash += pow_value * bit
+    end
+
+    return hash
+  end
+
+  def get_flavor_bits_hash(flavor_bits)
+    hash = 0
+
+    if FLAVOR_MATRIX.key?(flavor_bits[0])
+      hash += FLAVOR_MATRIX[flavor_bits[0]] * 10000
+    end
+
+    hash += flavor_bits[1]
+
+    return hash
+  end
+
+  def is_in_version_range(version_bits_hash, flavor_bits_hash, version_range)
+    range_from = parse_version_string(version_range[0])
+    range_to = parse_version_string(version_range[1])
+
+    from_version_hash = get_version_bits_hash(range_from[0])
+    to_version_hash = get_version_bits_hash(range_to[0])
+
+    if version_bits_hash < from_version_hash or version_bits_hash > to_version_hash
+      return false
+    end
+
+    if version_bits_hash == from_version_hash and flavor_bits_hash < get_flavor_bits_hash(range_from[1])
+      return false
+    end
+
+    if version_bits_hash == to_version_hash and flavor_bits_hash > get_flavor_bits_hash(range_to[1])
+      return false
+    end
+
+    return true
+  end
+
   # Input should be a value from versions.yml or the output of make_release_version().
   def get_download_slugs(input, mono = false)
     version_name = get_version_name(input)
@@ -170,17 +264,34 @@ module MakeDownloadFilter
     if not download_configs["defaults"].key?(version_major)
       return nil
     end
+    slugs_data = download_configs["defaults"][version_major]
 
-    slugs_defaults = download_configs["defaults"][version_major]
-    if mono
-      # Requesting mono, but there is no config for mono, abort.
-      if not slugs_defaults.key?("mono")
-        return nil
+    # Consider potential overrides.
+    if download_configs.key?("overrides")
+      version_bits_hash = get_version_bits_hash(parse_version_name(version_name))
+      flavor_bits_hash = get_flavor_bits_hash(parse_version_flavor(input["flavor"]))
+
+      for override_data in download_configs["overrides"] do
+        if override_data["version"] != version_major
+          next
+        end
+
+        if is_in_version_range(version_bits_hash, flavor_bits_hash, override_data["range"])
+          slugs_data = override_data["config"]
+          break
+        end
       end
-      slugs_defaults = slugs_defaults["mono"]
     end
 
-    return slugs_defaults
+    if mono
+      # Requesting mono, but there is no config for mono, abort.
+      if not slugs_data.key?("mono")
+        return nil
+      end
+      slugs_data = slugs_data["mono"]
+    end
+
+    return slugs_data
   end
 
 end