feat(health): don't warn if nvim-dap is not configured (#667)

lua/rustaceanvim/health.lua

@@ -5,18 +5,28 @@ local health = {}
 local h = vim.health
 
 ---@class rustaceanvim.LuaDependency
----@field module string The name of a module
----@field optional fun():boolean Function that returns whether the dependency is optional
+---@field name string The name of the dependency
+---@field module string The name of a module to check for
+---@field is_optional fun():boolean Function that returns whether the dependency is optional
+---@field is_configured fun():boolean Function that returns whether the dependency is configured
 ---@field url string URL (markdown)
 ---@field info string Additional information
 
 ---@type rustaceanvim.LuaDependency[]
 local lua_dependencies = {
   {
+    name = 'nvim-dap',
     module = 'dap',
-    optional = function()
+    is_optional = function()
       return true
     end,
+    is_configured = function()
+      local rustaceanvim_opts = type(vim.g.rustaceanvim) == 'function' and vim.g.rustaceanvim()
+        or vim.g.rustaceanvim
+        or {}
+      local dap_opts = vim.tbl_get(rustaceanvim_opts, 'dap')
+      return type(dap_opts) == 'table'
+    end,
     url = '[mfussenegger/nvim-dap](https://github.com/mfussenegger/nvim-dap)',
     info = 'Needed for debugging features',
   },
@@ -39,10 +49,14 @@ local function check_lua_dependency(dep)
     h.ok(dep.url .. ' installed.')
     return
   end
-  if dep.optional() then
-    h.warn(('%s not installed. %s %s'):format(dep.module, dep.info, dep.url))
+  if dep.is_optional() then
+    if dep.is_configured() then
+      h.warn(('optional dependency %s is configured, but not installed. %s %s'):format(dep.name, dep.info, dep.url))
+    else
+      h.ok(('optional dependency %s not installed. %s %s'):format(dep.name, dep.info, dep.url))
+    end
   else
-    error(('Lua dependency %s not found: %s'):format(dep.module, dep.url))
+    error(('Lua dependency %s not found: %s'):format(dep.name, dep.url))
   end
 end