From 7cb9f7aea300428fc38b5a71d1a6c48cf1f42efa Mon Sep 17 00:00:00 2001
From: William Boman <william@redwill.se>
Date: Sun, 17 Jul 2022 01:53:20 +0200
Subject: fix(mason-lspconfig): deduplicate :LspInstall completion items (#88)

---
 lua/mason-core/functional/init.lua  |  1 +
 lua/mason-core/functional/list.lua  | 18 ++++++++++++++++++
 lua/mason-lspconfig/api/command.lua |  4 ++--
 3 files changed, 21 insertions(+), 2 deletions(-)

(limited to 'lua')

diff --git a/lua/mason-core/functional/init.lua b/lua/mason-core/functional/init.lua
index a7b0a369..97865f05 100644
--- a/lua/mason-core/functional/init.lua
+++ b/lua/mason-core/functional/init.lua
@@ -38,6 +38,7 @@ _.head = list.head
 _.length = list.length
 _.flatten = list.flatten
 _.sort_by = list.sort_by
+_.uniq_by = list.uniq_by
 _.join = list.join
 
 -- relation
diff --git a/lua/mason-core/functional/list.lua b/lua/mason-core/functional/list.lua
index c3aaecd8..f30dd13d 100644
--- a/lua/mason-core/functional/list.lua
+++ b/lua/mason-core/functional/list.lua
@@ -172,4 +172,22 @@ _.join = fun.curryN(function(sep, list)
     return table.concat(list, sep)
 end, 2)
 
+---@generic T
+---@param fun (item: T): any
+---@param list T[]
+---@return T[]
+_.uniq_by = fun.curryN(function(comp, list)
+    local set = {}
+    local result = {}
+    for i = 1, #list do
+        local item = list[i]
+        local uniq_key = comp(item)
+        if not set[uniq_key] then
+            set[uniq_key] = true
+            table.insert(result, item)
+        end
+    end
+    return result
+end, 2)
+
 return _
diff --git a/lua/mason-lspconfig/api/command.lua b/lua/mason-lspconfig/api/command.lua
index 5f0da4bf..a782ac08 100644
--- a/lua/mason-lspconfig/api/command.lua
+++ b/lua/mason-lspconfig/api/command.lua
@@ -124,8 +124,8 @@ _G.mason_lspconfig_completion = {
         local package_names = _.filter_map(function(pkg_name)
             return Optional.of_nilable(server_mapping.package_to_lspconfig[pkg_name])
         end, registry.get_all_package_names())
-        local completion = _.concat(package_names, _.keys(language_mapping))
-        table.sort(completion)
+        local completion =
+            _.compose(_.sort_by(_.identity), _.uniq_by(_.identity), _.concat(_.keys(language_mapping)))(package_names)
         return table.concat(completion, "\n")
     end,
     installed_server_completion = function()
-- 
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