add function to add workspaces after init

.gitignore

@@ -0,0 +1 @@
+tags

README.md

@@ -154,6 +154,20 @@ telescope.setup {
 }
 ```
 
+### Adding workspaces
+
+Workspaces can be added or updated after initialisation by calling `add_workspaces`. See below for an example.
+**Note**: If you specify a workspace tag that already exists in the startup configuration, it will be overwritten.
+
+```lua
+local frecency = require("telescope").extensions.frecency
+frecency.add_workspaces({
+  ["conf"]    = "/home/another_user/.config",
+  ["data"]    = "/home/another_user/.local/share",
+  ["project"] = "/home/another_user/projects",
+  })
+```
+
 ### SQL database location
 
 The default location for the sqlite3 database is `$XDG_DATA_HOME/nvim` (eg `~/.local/share/nvim/` on linux).

lua/telescope/_extensions/frecency.lua

@@ -271,6 +271,12 @@ local function checkhealth()
   end
 end
 
+local function add_user_workspaces(mappings)
+  local workspaces = state.user_workspaces
+  for k,v in pairs(mappings) do workspaces[k] = v end
+  set_config_state("user_workspaces", workspaces, state.user_workspaces)
+end
+
 return telescope.register_extension {
   setup = function(ext_config)
     set_config_state("db_root", ext_config.db_root, nil)
@@ -294,5 +300,6 @@ return telescope.register_extension {
     get_workspace_tags = get_workspace_tags,
     validate_db = db_client.validate,
     health = checkhealth,
+    add_workspaces = add_user_workspaces,
   },
 }