refactor: Update Ollama model detection and context window documentation

aider/models.py

@@ -938,7 +938,7 @@ class Model(ModelSettings):
             self.edit_format = "diff"
             self.editor_edit_format = "editor-diff"
             self.use_repo_map = True
-            if "ollama" in model:
+            if model.startswith("ollama/") or model.startswith("ollama_chat/"):
                 self.extra_params = dict(num_ctx=8 * 1024)
             return  # <--
 

aider/website/_posts/2024-11-21-quantization.md

@@ -116,19 +116,12 @@ in the chat to make it fit within the context window.
 
 All of the Ollama results above were collected with at least an 8k context window, which
 is large enough to attempt all the coding problems in the benchmark.
+Aider sets Ollama's context window to 8k by default.
 
-You can set the Ollama server's context window with a 
+You can change the Ollama server's context window with a 
 [`.aider.model.settings.yml` file](https://aider.chat/docs/config/adv-model-settings.html#model-settings)
 like this:
 
-```
-- name: aider/extra_params
-  extra_params:
-    num_ctx: 8192
-```
-
-That uses the special model name `aider/extra_params` to set it for *all* models. You should probably use a specific model name like:
-
 ```
 - name: ollama/qwen2.5-coder:32b-instruct-fp16
   extra_params:

aider/website/docs/llms/ollama.md

@@ -44,28 +44,25 @@ setx   OLLAMA_API_KEY <api-key> # Windows, restart shell after setx
 
 [Ollama uses a 2k context window by default](https://github.com/ollama/ollama/blob/main/docs/faq.md#how-can-i-specify-the-context-window-size),
 which is very small for working with aider.
-Unlike most other LLM servers, Ollama does not throw an error if you submit
-a request that exceeds the context window.
-Instead, it just silently truncates the request by discarding the "oldest" messages
-in the chat to make it fit within the context window.
 
-All of the Ollama results above were collected with at least an 8k context window, which
+Aider sets Ollama's context window to 8k by default. 
-is large enough to attempt all the coding problems in the benchmark.
+If you would like
-
+a large context window
-You can set the Ollama server's context window with a 
+you can use a
 [`.aider.model.settings.yml` file](https://aider.chat/docs/config/adv-model-settings.html#model-settings)
 like this:
 
-```
-- name: aider/extra_params
-  extra_params:
-    num_ctx: 8192
-```
-
-That uses the special model name `aider/extra_params` to set it for *all* models. You should probably use a specific model name like:
-
 ```
 - name: ollama/qwen2.5-coder:32b-instruct-fp16
   extra_params:
     num_ctx: 8192
 ```
+
+Unlike most other LLM servers, Ollama does not throw an error if you submit
+a request that exceeds the context window.
+Instead, it just silently truncates the request by discarding the "oldest" messages
+in the chat to make it fit within the context window.
+So if your context window is too small, you won't get an error.
+Aider will probably just fail to work well and experience
+a lot of 
+[file editing problems](https://aider.chat/docs/troubleshooting/edit-errors.html).