Fix to support lm-studio servers with openai style api and baseurl (#196)

Co-authored-by: cryptax <axelle@alligator>

Author: cryptax

src/README.md

@@ -63,7 +63,7 @@ These can be set with `r2ai -e <keyname>=<value>`
 |------------------|------------------------------------------------------------------------------------------------|
 | r2ai.api         | Name of the provider e.g `openai`. List possibilities with `r2ai -e r2ai.api=?`                |
 | r2ai.model       | Model name. List possibilities with `r2ai -e r2ai.model=?`                                     |
-| r2ai.baseurl     | Remote LLM HTTP server e.g http://127.0.0.1:11434. |
+| r2ai.baseurl     | Remote LLM base URL. Specify host if necessary e.g http://127.0.0.1:11434. |
 | r2ai.max_tokens  | Maximum output tokens or maximum total tokens. Check the appropriate limits for your model     |
 | r2ai.temperature | How creative the model should be. 0=not creative, 1=very creative                              |
 | r2ai.cmds        | R2 command to issue and send output in context to model                                        |
@@ -256,3 +256,16 @@ r2ai_messages_add_tool_call(msgs, "r2cmd", "{\"command\":\"pdf@main\"}", "tool-1
 // Free all resources when done
 r2ai_messages_free(msgs);
 ```
+## lm-studio
+
+Install [LM Studio](https://lmstudio.ai/). On a server, LM Studio must be run as a normal user (not root) + install *FUSE*.
+
+Then, download your preferred model(s). For example to install GPT-OSS,  follow this [cookbook](https://cookbook.openai.com/articles/gpt-oss/run-locally-lmstudio).
+
+When you launch LM Studio, go to developer options, Settings, and select server **port** (1234 by default) and check whether you need "serve on a local network" or not (accessible on localhost only, or on a local network).
+
+In r2ai, as lm-studio uses an OpenAI-like API, configure:
+
+- `r2ai -e api=openai`
+- `r2ai -e baseurl=http://LM-STUDIO-IP:PORT`
+- `r2ai -e model=?` to list available models

src/r2ai.c

@@ -768,7 +768,13 @@ static void cmd_r2ai(RCore *core, const char *input) {
 
 R_IPI const char *r2ai_get_provider_url(RCore *core, const char *provider) {
 	if (strcmp (provider, "openai") == 0) {
-		return "https://api.openai.com/v1";
+		const char *host = r_config_get (core->config, "r2ai.baseurl");
+		if (R_STR_ISNOTEMPTY (host)) {
+			if (r_str_startswith (host, "http")) {
+				return r_str_newf ("%s/v1", host);
+			}
+			return r_str_newf ("http://%s/v1", host);
+		} else return "https://api.openai.com/v1";
 	} else if (strcmp (provider, "gemini") == 0) {
 		return "https://generativelanguage.googleapis.com/v1beta/openai";
 	} else if (strcmp (provider, "ollama") == 0) {