X-Git-Url: https://git.giacomolli.uk/onechat/blobdiff_plain/6572373d4945cc5c504fc5f760d7de51fb245d3f..150e81034dc65943803924ef29962e2481ffe771:/README.rst?ds=inline

diff --git a/README.rst b/README.rst
index df03c4f..362eeeb 100644
--- a/README.rst
+++ b/README.rst
@@ -5,6 +5,46 @@
 OneChat is a Go program. It prints its name. It is in early development.
 Linux is supported.
 
+****************
+ Data directory
+****************
+
+OneChat keeps its data and its token file in one directory. It uses the
+first of these:
+
+#. ``ONECHAT_DIR``, when it is set.
+#. ``$XDG_DATA_HOME/onechat``, when ``XDG_DATA_HOME`` is an absolute
+   path. A relative value is ignored.
+#. ``~/.local/share/onechat``. With no home directory, OneChat exits
+   with an error.
+
+OneChat creates the directory with mode 0700.
+
+***************
+ Configuration
+***************
+
+``config.json`` in the data directory holds the settings. OneChat does
+not create it. A missing file or field takes the default, and an unknown
+field is an error.
+
+.. code:: json
+
+   {
+     "endpoint": "chatgpt",
+     "compactor": {"model": "gpt-6-luna", "effort": "high"}
+   }
+
+``endpoint``
+   ``chatgpt`` (the default) sends model calls to the ChatGPT backend
+   with the subscription login. ``api`` sends them to the OpenAI API
+   with the key in ``OPENAI_API_KEY``, which must then be set. With
+   ``chatgpt``, OneChat ignores ``OPENAI_API_KEY``.
+
+``compactor``
+   The model and the reasoning effort of the summaries. The defaults are
+   ``gpt-6-luna`` and ``high``.
+
 *************
  Development
 *************