Begin work on larger global config, to tailor defaults

lua/telescope/config.lua

@@ -1,25 +1,61 @@
-local get_default = require('telescope.utils').get_default
+-- Keep the values around between reloads
+_TelescopeConfigurationValues = _TelescopeConfigurationValues or {}
 
+local function first_non_null(...)
+  local n = select('#', ...)
+  for i = 1, n do
+    local value = select(i, ...)
+
+    if value ~= nil then
+      return value
+    end
+  end
+end
 
 -- TODO: Add other major configuration points here.
 -- border
 -- borderchars
 -- selection_strategy
 
--- TODO: use `require('telescope').setup { }`
+local config = {}
 
-_TelescopeConfigurationValues = _TelescopeConfigurationValues or {}
+config.values = _TelescopeConfigurationValues
 
-_TelescopeConfigurationValues.default_layout_strategy = get_default(
-  _TelescopeConfigurationValues.default_layout_strategy,
-  'horizontal'
-)
+function config.set_defaults(defaults)
+  defaults = defaults or {}
 
--- TODO: this should probably be more complicated than just a number.
---  If you're going to allow a bunch of layout strats, they should have nested info or something
-_TelescopeConfigurationValues.default_window_width = get_default(
-  _TelescopeConfigurationValues.default_window_width,
-  0.75
-)
+  local function get(name, default_val)
+    return first_non_null(defaults[name], config.values[name], default_val)
+  end
 
-return _TelescopeConfigurationValues
+  local function set(name, default_val)
+    config.values[name] = get(name, default_val)
+  end
+
+  set("selection_strategy", "reset")
+
+  set("layout_strategy", "horizontal")
+  set("width", 0.75)
+  set("winblend", 0)
+
+  -- TODO: Shortenpath
+  --    Decide how to propagate that to all the opts everywhere.
+
+  -- NOT STABLE. DO NOT USE
+  set("horizontal_config", {
+    get_preview_width = function(columns, _)
+      return math.floor(columns * 0.75)
+    end,
+  })
+end
+
+function config.clear_defaults()
+  for k, _ in pairs(config.values) do
+    config.values[k] = nil
+  end
+end
+
+config.set_defaults()
+
+
+return config