fix: ensure no duplicate languages with different casing (#117)

1 files changed, 10 insertions, 0 deletions

diff --git a/scripts/lua/mason-scripts/mason/generate.lua b/scripts/lua/mason-scripts/mason/generate.lua
index 6f0bd4d2..4c2f47ce 100644
--- a/scripts/lua/mason-scripts/mason/generate.lua
+++ b/scripts/lua/mason-scripts/mason/generate.lua
@@ -10,11 +10,21 @@ local MASON_REGISTRY_DIR = path.concat { vim.loop.cwd(), "lua", "mason-registry"
 ---@async
 local function create_language_map()
     print "Creating language map…"
+    local indexed_languages = {}
     local language_map = {}
     local sorted_packages = _.sort_by(_.prop "name", registry.get_all_packages())
     _.each(function(pkg)
         _.each(function(language)
             local language_lc = language:lower()
+            if indexed_languages[language_lc] and indexed_languages[language_lc] ~= language then
+                error(
+                    ("Found two variants of same language with differing cases %s != %s"):format(
+                        indexed_languages[language_lc],
+                        language
+                    )
+                )
+            end
+            indexed_languages[language_lc] = language
             language_map[language_lc] = _.append(pkg.name, language_map[language_lc] or {})
         end, pkg.spec.languages)
     end, sorted_packages)