* gptel.el (gptel--save-state, gptel--restore-state,
gptel-temperature, gptel-model, gptel-max-tokens,
gptel-directives, gptel--always, gptel--button-buttonize,
gptel--system-message, gptel--bounds): Write gptel parameters as
file-local variables when saving chats in Markdown or text files.
The local variable gptel--bounds stores the locations of the
responses from the LLM. This is not a great solution, but the best
I can think to do without adding more syntax to the document.
Chats can be restored by turning on `gptel-mode'. One of the
problem with this approach is that if the buffer is modified
before `gptel-mode' is turned on, the state data is out of date.
Another problem is that this metadata block as printed in the
buffer can become quite long. A better approach is needed.
Define helper functions `gptel--always' and
`gptel--button-buttonize' to work around Emacs 27.1 support.
* README.org: Mention saving and restoring chats where
appropriate.
gptel.el (gptel-response-filter-functions, gptel-send,
gptel--create-prompt, gptel--transform-response, gptel--convert-org,
gptel--convert-markdown->org): Add support for org-mode by transforming
the response manually. (Note: Asking ChatGPT to format its results in
org-mode markup produces inconsistent results.)
Additionally, the abnormal hook `gptel-resposne-filter-functions' is
added for arbitrary transformations of the response. Its implementation
seems needlessly complex, and in the future we should change it to
use `run-hook-wrapped' with a local accumulator.
