feat: add support for removal of packages from a registryfix/support-removed-packages

This adds support for removal of packages from any given registry.
Currently mason.nvim doesn't support this at all and throws an error
when trying to interact with the registry in any way while having a
removed package installed locally.

This ensures that removed packages are available both in the `:Mason` UI
as well as the public Lua APIs. These "synthesized" packages only
supports uninstallation, and metadata such as licenses, categories,
homepage, etc is not available.

1 files changed, 12 insertions, 0 deletions

diff --git a/lua/mason-core/receipt.lua b/lua/mason-core/receipt.lua
index 42a7e882..bdf96254 100644
--- a/lua/mason-core/receipt.lua
+++ b/lua/mason-core/receipt.lua
@@ -1,3 +1,7 @@
+local Optional = require "mason-core.optional"
+local Purl = require "mason-core.purl"
+local _ = require "mason-core.functional"
+
 local M = {}
 
 ---@alias InstallReceiptSchemaVersion
@@ -41,6 +45,14 @@ function InstallReceipt:get_name()
     return self.name
 end
 
+---@return string?
+function InstallReceipt:get_installed_package_version()
+    local source = self:get_source()
+    if source.id then
+        return Purl.parse(source.id):map(_.prop "version"):get_or_nil()
+    end
+end
+
 function InstallReceipt:get_schema_version()
     return self.schema_version
 end