Allow creating custom providers (#132)

src/components/CreateCustomProviderDialog.tsx

+import React, { useState } from "react";
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogDescription,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Loader2 } from "lucide-react";
+import { useCustomLanguageModelProvider } from "@/hooks/useCustomLanguageModelProvider";
+
+interface CreateCustomProviderDialogProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onSuccess: () => void;
+}
+
+export function CreateCustomProviderDialog({
+  isOpen,
+  onClose,
+  onSuccess,
+}: CreateCustomProviderDialogProps) {
+  const [id, setId] = useState("");
+  const [name, setName] = useState("");
+  const [apiBaseUrl, setApiBaseUrl] = useState("");
+  const [envVarName, setEnvVarName] = useState("");
+  const [errorMessage, setErrorMessage] = useState("");
+
+  const { createProvider, isCreating, error } =
+    useCustomLanguageModelProvider();
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setErrorMessage("");
+
+    try {
+      await createProvider({
+        id: id.trim(),
+        name: name.trim(),
+        apiBaseUrl: apiBaseUrl.trim(),
+        envVarName: envVarName.trim() || undefined,
+      });
+
+      // Reset form
+      setId("");
+      setName("");
+      setApiBaseUrl("");
+      setEnvVarName("");
+
+      onSuccess();
+    } catch (error) {
+      setErrorMessage(
+        error instanceof Error
+          ? error.message
+          : "Failed to create custom provider",
+      );
+    }
+  };
+
+  const handleClose = () => {
+    if (!isCreating) {
+      setErrorMessage("");
+      onClose();
+    }
+  };
+
+  return (
+    <Dialog open={isOpen} onOpenChange={handleClose}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>Add Custom Provider</DialogTitle>
+          <DialogDescription>
+            Connect to a custom language model provider API
+          </DialogDescription>
+        </DialogHeader>
+
+        <form onSubmit={handleSubmit} className="space-y-4 pt-4">
+          <div className="space-y-2">
+            <Label htmlFor="id">Provider ID</Label>
+            <Input
+              id="id"
+              value={id}
+              onChange={(e) => setId(e.target.value)}
+              placeholder="E.g., my-provider"
+              required
+              disabled={isCreating}
+            />
+            <p className="text-xs text-muted-foreground">
+              A unique identifier for this provider (no spaces).
+            </p>
+          </div>
+
+          <div className="space-y-2">
+            <Label htmlFor="name">Display Name</Label>
+            <Input
+              id="name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              placeholder="E.g., My Provider"
+              required
+              disabled={isCreating}
+            />
+            <p className="text-xs text-muted-foreground">
+              The name that will be displayed in the UI.
+            </p>
+          </div>
+
+          <div className="space-y-2">
+            <Label htmlFor="apiBaseUrl">API Base URL</Label>
+            <Input
+              id="apiBaseUrl"
+              value={apiBaseUrl}
+              onChange={(e) => setApiBaseUrl(e.target.value)}
+              placeholder="E.g., https://api.example.com/v1"
+              required
+              disabled={isCreating}
+            />
+            <p className="text-xs text-muted-foreground">
+              The base URL for the API endpoint.
+            </p>
+          </div>
+
+          <div className="space-y-2">
+            <Label htmlFor="envVarName">Environment Variable (Optional)</Label>
+            <Input
+              id="envVarName"
+              value={envVarName}
+              onChange={(e) => setEnvVarName(e.target.value)}
+              placeholder="E.g., MY_PROVIDER_API_KEY"
+              disabled={isCreating}
+            />
+            <p className="text-xs text-muted-foreground">
+              Environment variable name for the API key.
+            </p>
+          </div>
+
+          {(errorMessage || error) && (
+            <div className="text-sm text-red-500">
+              {errorMessage ||
+                (error instanceof Error
+                  ? error.message
+                  : "Failed to create custom provider")}
+            </div>
+          )}
+
+          <div className="flex justify-end gap-2">
+            <Button
+              type="button"
+              variant="outline"
+              onClick={handleClose}
+              disabled={isCreating}
+            >
+              Cancel
+            </Button>
+            <Button type="submit" disabled={isCreating}>
+              {isCreating && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+              {isCreating ? "Adding..." : "Add Provider"}
+            </Button>
+          </div>
+        </form>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/components/ProviderSettings.tsx

@@ -9,19 +9,24 @@ import { providerSettingsRoute } from "@/routes/settings/providers/$provider";
 import type { LanguageModelProvider } from "@/ipc/ipc_types";
 
 import { useLanguageModelProviders } from "@/hooks/useLanguageModelProviders";
-import { GiftIcon } from "lucide-react";
+import { GiftIcon, PlusIcon } from "lucide-react";
 import { Skeleton } from "./ui/skeleton";
 import { Alert, AlertDescription, AlertTitle } from "./ui/alert";
 import { AlertTriangle } from "lucide-react";
+import { useState } from "react";
+
+import { CreateCustomProviderDialog } from "./CreateCustomProviderDialog";
 
 export function ProviderSettingsGrid() {
   const navigate = useNavigate();
+  const [isDialogOpen, setIsDialogOpen] = useState(false);
 
   const {
     data: providers,
     isLoading,
     error,
     isProviderSetup,
+    refetch,
   } = useLanguageModelProviders();
 
   const handleProviderClick = (providerId: string) => {
@@ -100,7 +105,32 @@ export function ProviderSettingsGrid() {
             </Card>
           );
         })}
+
+        {/* Add custom provider button */}
+        <Card
+          className="cursor-pointer transition-all hover:shadow-md border-border border-dashed hover:border-primary/70"
+          onClick={() => setIsDialogOpen(true)}
+        >
+          <CardHeader className="p-4 flex flex-col items-center justify-center h-full">
+            <PlusIcon className="h-10 w-10 text-muted-foreground mb-2" />
+            <CardTitle className="text-xl text-center">
+              Add custom provider
+            </CardTitle>
+            <CardDescription className="text-center">
+              Connect to a custom LLM API endpoint
+            </CardDescription>
+          </CardHeader>
+        </Card>
       </div>
+
+      <CreateCustomProviderDialog
+        isOpen={isDialogOpen}
+        onClose={() => setIsDialogOpen(false)}
+        onSuccess={() => {
+          setIsDialogOpen(false);
+          refetch();
+        }}
+      />
     </div>
   );
 }

src/hooks/useCustomLanguageModelProvider.ts

+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { IpcClient } from "@/ipc/ipc_client";
+import type { LanguageModelProvider } from "@/ipc/ipc_types";
+import { showError } from "@/lib/toast";
+
+export interface CreateCustomLanguageModelProviderParams {
+  id: string;
+  name: string;
+  apiBaseUrl: string;
+  envVarName?: string;
+}
+
+export function useCustomLanguageModelProvider() {
+  const queryClient = useQueryClient();
+  const ipcClient = IpcClient.getInstance();
+
+  const createProviderMutation = useMutation({
+    mutationFn: async (
+      params: CreateCustomLanguageModelProviderParams,
+    ): Promise<LanguageModelProvider> => {
+      if (!params.id.trim()) {
+        throw new Error("Provider ID is required");
+      }
+      if (!params.name.trim()) {
+        throw new Error("Provider name is required");
+      }
+      if (!params.apiBaseUrl.trim()) {
+        throw new Error("API base URL is required");
+      }
+
+      return ipcClient.createCustomLanguageModelProvider({
+        id: params.id.trim(),
+        name: params.name.trim(),
+        apiBaseUrl: params.apiBaseUrl.trim(),
+        envVarName: params.envVarName?.trim() || undefined,
+      });
+    },
+    onSuccess: () => {
+      // Invalidate and refetch
+      queryClient.invalidateQueries({ queryKey: ["languageModelProviders"] });
+    },
+    onError: (error) => {
+      showError(error);
+    },
+  });
+
+  const createProvider = async (
+    params: CreateCustomLanguageModelProviderParams,
+  ): Promise<LanguageModelProvider> => {
+    return createProviderMutation.mutateAsync(params);
+  };
+
+  return {
+    createProvider,
+    isCreating: createProviderMutation.isPending,
+    error: createProviderMutation.error,
+  };
+}

src/ipc/handlers/language_model_handlers.ts

@@ -2,10 +2,21 @@ import type { LanguageModelProvider } from "@/ipc/ipc_types";
 import { createLoggedHandler } from "./safe_handle";
 import log from "electron-log";
 import { getLanguageModelProviders } from "../shared/language_model_helpers";
+import { db } from "@/db";
+import { language_model_providers as languageModelProvidersSchema } from "@/db/schema";
+import { eq } from "drizzle-orm";
+import { IpcMainInvokeEvent } from "electron";
 
 const logger = log.scope("language_model_handlers");
 const handle = createLoggedHandler(logger);
 
+export interface CreateCustomLanguageModelProviderParams {
+  id: string;
+  name: string;
+  apiBaseUrl: string;
+  envVarName?: string;
+}
+
 export function registerLanguageModelHandlers() {
   handle(
     "get-language-model-providers",
@@ -13,4 +24,55 @@ export function registerLanguageModelHandlers() {
       return getLanguageModelProviders();
     },
   );
+
+  handle(
+    "create-custom-language-model-provider",
+    async (
+      event: IpcMainInvokeEvent,
+      params: CreateCustomLanguageModelProviderParams,
+    ): Promise<LanguageModelProvider> => {
+      const { id, name, apiBaseUrl, envVarName } = params;
+
+      // Validation
+      if (!id) {
+        throw new Error("Provider ID is required");
+      }
+
+      if (!name) {
+        throw new Error("Provider name is required");
+      }
+
+      if (!apiBaseUrl) {
+        throw new Error("API base URL is required");
+      }
+
+      // Check if a provider with this ID already exists
+      const existingProvider = await db
+        .select()
+        .from(languageModelProvidersSchema)
+        .where(eq(languageModelProvidersSchema.id, id))
+        .get();
+
+      if (existingProvider) {
+        throw new Error(`A provider with ID "${id}" already exists`);
+      }
+
+      // Insert the new provider
+      await db.insert(languageModelProvidersSchema).values({
+        id,
+        name,
+        api_base_url: apiBaseUrl,
+        env_var_name: envVarName || null,
+      });
+
+      // Return the newly created provider
+      return {
+        id,
+        name,
+        apiBaseUrl,
+        envVarName,
+        type: "custom",
+      };
+    },
+  );
 }

src/ipc/ipc_client.ts

@@ -732,5 +732,24 @@ export class IpcClient {
     return this.ipcRenderer.invoke("get-language-model-providers");
   }
 
+  public async createCustomLanguageModelProvider({
+    id,
+    name,
+    apiBaseUrl,
+    envVarName,
+  }: {
+    id: string;
+    name: string;
+    apiBaseUrl: string;
+    envVarName?: string;
+  }): Promise<LanguageModelProvider> {
+    return this.ipcRenderer.invoke("create-custom-language-model-provider", {
+      id,
+      name,
+      apiBaseUrl,
+      envVarName,
+    });
+  }
+
   // --- End window control methods ---
 }

src/preload.ts

@@ -6,6 +6,7 @@ import { contextBridge, ipcRenderer } from "electron";
 // Whitelist of valid channels
 const validInvokeChannels = [
   "get-language-model-providers",
+  "create-custom-language-model-provider",
   "chat:add-dep",
   "chat:message",
   "chat:cancel",

src/renderer.tsx

@@ -32,6 +32,9 @@ const queryClient = new QueryClient({
     queries: {
       retry: false,
     },
+    mutations: {
+      retry: false,
+    },
   },
   queryCache: new QueryCache({
     onError: (error, query) => {