Add OpenAI-compatible API endpoint and model configuration

Author: henrybarreto

autoload/copilot.vim

@@ -787,17 +787,26 @@ function! s:commands.model(opts) abort
     return 'echoerr ' . string('Copilot: Error retrieving completions models: ' . response.error.message)
   endif
   let models = filter(response.result, { _, m -> index(m.scopes, 'completion') >= 0 })
+  let current_model = get(g:, 'copilot_model', '')
   if len(models) == 0
-    echo 'Copilot: Could not retrieve completions models'
-  elseif len(models) == 1
+    if !empty(current_model)
+      echo 'Copilot: Current/only completions model is ' . current_model . ' (set via g:copilot_model)'
+    else
+      echo 'Copilot: Could not retrieve completions models'
+    endif
+  elseif len(models) == 1 && empty(current_model)
     echo 'Copilot: Current/only completions model is ' . s:FmtModel(models[0])
   else
+    if !empty(current_model)
+      call insert(models, {'modelName': current_model, 'id': current_model, 'scopes': ['completion']})
+    endif
     let choices = map(copy(models), { i, m -> (i + 1) . '. ' . s:FmtModel(m) })
     let choice = inputlist(['Select a completions model:'] + choices)
     if choice < 1 || choice > len(models)
       return
     endif
     let model = models[choice - 1]
+    let g:copilot_model = model.id
     if type(get(g:, 'copilot_settings')) != v:t_dict
       let g:copilot_settings = {}
     endif

autoload/copilot/client.vim

@@ -596,6 +596,21 @@ function! copilot#client#Settings() abort
   if type(settings.http.proxy) ==# v:t_string && settings.http.proxy =~# '^[^/]\+$'
     let settings.http.proxy = 'http://' . settings.http.proxy
   endif
+  if type(get(g:, 'copilot_api_url')) == v:t_string
+    let settings.api = {'url': g:copilot_api_url}
+  endif
+  if type(get(g:, 'copilot_api_key')) == v:t_string
+    if !has_key(settings, 'api')
+      let settings.api = {}
+    endif
+    let settings.api.key = g:copilot_api_key
+  endif
+  if type(get(g:, 'copilot_model')) == v:t_string
+    if !has_key(settings, 'api')
+      let settings.api = {}
+    endif
+    let settings.api.model = g:copilot_model
+  endif
   if type(get(g:, 'copilot_settings')) == v:t_dict
     let settings.github = {'copilot': g:copilot_settings}
   endif
@@ -718,6 +733,12 @@ function! copilot#client#New() abort
   if type(get(g:, 'copilot_integration_id')) == v:t_string
     let opts.initializationOptions.copilotIntegrationId = g:copilot_integration_id
   endif
+  if type(get(g:, 'copilot_model')) == v:t_string
+    if type(get(g:, 'copilot_settings')) != v:t_dict
+      let g:copilot_settings = {}
+    endif
+    let g:copilot_settings.selectedCompletionModel = g:copilot_model
+  endif
   let opts.workspaceFolders = []
   let settings = copilot#client#Settings()
   if type(get(g:, 'copilot_workspace_folders')) == v:t_list

doc/copilot.txt

@@ -34,6 +34,10 @@ COMMANDS                                        *:Copilot*
                         completions models is one, rendering this command
                         inert.
 
+                        The model can also be set via |g:copilot_model| in your
+                        vimrc to specify an arbitrary model without the
+                        interactive prompt.
+
                                                 *:Copilot_panel*
 :Copilot panel          Open a window with up to 10 completions for the
                         current buffer.  Use <CR> to accept a completion.
@@ -125,6 +129,29 @@ g:copilot_proxy_strict_ssl
                         by setting the $NODE_TLS_REJECT_UNAUTHORIZED
                         environment variable to "0".
 
+                                                *g:copilot_api_url*
+g:copilot_api_url       Specify an OpenAI API compatible endpoint URL for
+                        completions.  When set, this URL will be passed to the
+                        language server for use with any OpenAI-compatible API.
+>
+                        let g:copilot_api_url = 'https://api.openai.com/v1'
+                        let g:copilot_api_url = 'http://localhost:11434/v1'
+<
+                                                *g:copilot_api_key*
+g:copilot_api_key       Specify an API key for use with the API endpoint
+                        configured via |g:copilot_api_url|.
+>
+                        let g:copilot_api_key = 'sk-...'
+<
+                                                *g:copilot_model*
+g:copilot_model         Specify the model to use for completions, bypassing the
+                        interactive |:Copilot_model| command.  Setting this
+                        also populates |g:copilot_settings| with the given
+                        model.
+>
+                        let g:copilot_model = 'gpt-4o'
+                        let g:copilot_model = 'codellama'
+<
                                                 *g:copilot_workspace_folders*
 g:copilot_workspace_folders
                         A list of "workspace folders" or project roots that