Add support for custom provider

README.md

@@ -547,6 +547,34 @@ Below, we provide an example for [lualine](https://github.com/nvim-lualine/luali
 
 ```
 
+## Adding a custom provider
+In case your provider is not available, there is an option to resuse a present
+provider with a different endpoint and a custom selection of models.
+For this, the `custom` provider needs to be added to the list of providers the following way:
+```lua
+  providers = {
+    custom = {
+      style = "openai",
+      api_key = os.getenv "CUSTOM_API_KEY",
+      endpoint = "https://api.openai.com/v1/chat/completions",
+      models = {
+        "gpt-4o-mini",
+        "gpt-4o",
+      },
+      -- parameters to summarize chat
+      topic = {
+        model = "gpt-4o-mini",
+        params = { max_completion_tokens = 64 },
+      },
+      -- default parameters
+      params = {
+        chat = { temperature = 1.1, top_p = 1 },
+        command = { temperature = 1.1, top_p = 1 },
+      },
+    }
+  }
+```
+
 ## Bonus
 
 Access parrot.nvim directly from your terminal:

lua/parrot/chat_handler.lua

@@ -62,7 +62,9 @@ end
 function ChatHandler:set_provider(selected_prov, is_chat)
   local endpoint = self.providers[selected_prov].endpoint
   local api_key = self.providers[selected_prov].api_key
-  local _prov = init_provider(selected_prov, endpoint, api_key)
+  local style = self.providers[selected_prov].style
+  local models = self.providers[selected_prov].models
+  local _prov = init_provider(selected_prov, endpoint, api_key, style, models)
   self.current_provider[is_chat and "chat" or "command"] = _prov
   self.state:set_provider(_prov.name, is_chat)
   self.state:refresh(self.available_providers, self.available_models)

lua/parrot/config.lua

@@ -172,6 +172,12 @@ local defaults = {
         command = { temperature = 1.1, top_p = 1 },
       },
     },
+    custom = {
+      style = "openai",
+      api_key = "",
+      endpoint = "https://api.openai.com/v1/chat/completions",
+      topic_prompt = topic_prompt,
+    },
   },
   cmd_prefix = "Prt",
   curl_params = {},
@@ -374,7 +380,13 @@ function M.setup(opts)
 
   local available_models = {}
   for _, prov_name in ipairs(M.available_providers) do
-    local _prov = init_provider(prov_name, M.providers[prov_name].endpoint, M.providers[prov_name].api_key)
+    local _prov = init_provider(
+      prov_name,
+      M.providers[prov_name].endpoint,
+      M.providers[prov_name].api_key,
+      M.providers[prov_name].style or nil,
+      M.providers[prov_name].models or nil
+    )
     -- do not make an API call on startup
     available_models[prov_name] = _prov:get_available_models(false)
   end

lua/parrot/provider/init.lua

@@ -16,7 +16,7 @@ local M = {}
 ---@param endpoint string # API endpoint for the provider
 ---@param api_key string|table # API key or routine for authentication
 ---@return table # returns initialized provider
-M.init_provider = function(prov_name, endpoint, api_key)
+M.init_provider = function(prov_name, endpoint, api_key, style, models)
   local providers = {
     anthropic = Anthropic,
     gemini = Gemini,
@@ -30,12 +30,14 @@ M.init_provider = function(prov_name, endpoint, api_key)
     xai = xAI,
   }
 
-  local ProviderClass = providers[prov_name]
-  if not ProviderClass then
-    logger.error("Unknown provider " .. prov_name)
-    return {}
+  if providers[prov_name] then
+    return providers[prov_name]:new(endpoint, api_key)
+  elseif style and providers[style] then
+    return providers[style]:new(endpoint, api_key, prov_name, models)
   end
-  return ProviderClass:new(endpoint, api_key)
+
+  logger.error("Unknown provider " .. prov_name)
+  return {}
 end
 
 return M

lua/parrot/provider/ollama.lua

@@ -104,7 +104,7 @@ function Ollama:get_available_models()
     logger.error("Ollama is not installed or not in PATH.")
     return {}
   end
-	local endpoint_api = self.endpoint:gsub("chat", "")
+  local endpoint_api = self.endpoint:gsub("chat", "")
 
   local job = Job:new({
     command = "curl",

lua/parrot/provider/openai.lua

@@ -36,11 +36,12 @@ local AVAILABLE_API_PARAMETERS = {
 ---@param endpoint string
 ---@param api_key string|table
 ---@return OpenAI
-function OpenAI:new(endpoint, api_key)
+function OpenAI:new(endpoint, api_key, name, models)
   return setmetatable({
     endpoint = endpoint,
     api_key = api_key,
-    name = "openai",
+    models = models,
+    name = name or "openai",
   }, self)
 end
 
@@ -145,6 +146,10 @@ end
 ---@param online boolean Whether to fetch models online
 ---@return string[]
 function OpenAI:get_available_models(online)
+  if self.models then
+    return self.models
+  end
+
   local ids = {
     "gpt-4o",
     "gpt-4-turbo",