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gptel-anthropic.el
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gptel-anthropic.el
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;;; gptel-anthropic.el --- Anthropic AI suppport for gptel -*- lexical-binding: t; -*-
;; Copyright (C) 2023 Karthik Chikmagalur
;; Author: Karthik Chikmagalur <[email protected]>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This file adds support for Anthropic's Messages API to gptel
;;; Code:
(require 'cl-generic)
(eval-when-compile
(require 'cl-lib))
(require 'map)
(require 'gptel)
(defvar json-object-type)
(declare-function prop-match-value "text-property-search")
(declare-function text-property-search-backward "text-property-search")
(declare-function json-read "json" ())
;;; Anthropic (Messages API)
(cl-defstruct (gptel-anthropic (:constructor gptel--make-anthropic)
(:copier nil)
(:include gptel-backend)))
(cl-defmethod gptel-curl--parse-stream ((_backend gptel-anthropic) _info)
(let* ((content-strs)
(pt (point)))
(condition-case nil
(while (re-search-forward "^event: " nil t)
(setq pt (match-beginning 0))
(if (equal (line-end-position) (point-max))
(error "Data block incomplete"))
(when (looking-at "content_block_\\(?:start\\|delta\\|stop\\)")
(forward-line 1) (forward-char 5)
(when-let* ((response (gptel--json-read))
(content (map-nested-elt
response '(:delta :text))))
(push content content-strs))))
(error (goto-char pt)))
(apply #'concat (nreverse content-strs))))
(cl-defmethod gptel--parse-response ((_backend gptel-anthropic) response _info)
(map-nested-elt response '(:content 0 :text)))
(cl-defmethod gptel--request-data ((_backend gptel-anthropic) prompts)
"JSON encode PROMPTS for sending to ChatGPT."
(let ((prompts-plist
`(:model ,gptel-model
:system ,gptel--system-message
:stream ,(or (and gptel-stream gptel-use-curl
(gptel-backend-stream gptel-backend))
:json-false)
:max_tokens ,(or gptel-max-tokens 1024)
:messages [,@prompts])))
(when gptel-temperature
(plist-put prompts-plist :temperature gptel-temperature))
prompts-plist))
(cl-defmethod gptel--parse-buffer ((_backend gptel-anthropic) &optional max-entries)
(let ((prompts) (prop))
(while (and
(or (not max-entries) (>= max-entries 0))
(setq prop (text-property-search-backward
'gptel 'response
(when (get-char-property (max (point-min) (1- (point)))
'gptel)
t))))
(push (list :role (if (prop-match-value prop) "assistant" "user")
:content
(string-trim
(buffer-substring-no-properties (prop-match-beginning prop)
(prop-match-end prop))
(format "[\t\r\n ]*\\(?:%s\\)?[\t\r\n ]*"
(regexp-quote (gptel-prompt-prefix-string)))
(format "[\t\r\n ]*\\(?:%s\\)?[\t\r\n ]*"
(regexp-quote (gptel-response-prefix-string)))))
prompts)
(and max-entries (cl-decf max-entries)))
prompts))
;;;###autoload
(cl-defun gptel-make-anthropic
(name &key curl-args stream key
(header
(lambda () (when-let (key (gptel--get-api-key))
`(("x-api-key" . ,key)
("anthropic-version" . "2023-06-01")))))
(models '("claude-3-sonnet-20240229"
"claude-3-haiku-20240307"
"claude-3-opus-20240229"))
(host "api.anthropic.com")
(protocol "https")
(endpoint "/v1/messages"))
"Register an Anthropic API-compatible backend for gptel with NAME.
Keyword arguments:
CURL-ARGS (optional) is a list of additional Curl arguments.
HOST (optional) is the API host, \"api.anthropic.com\" by default.
MODELS is a list of available model names.
STREAM is a boolean to toggle streaming responses, defaults to
false.
PROTOCOL (optional) specifies the protocol, https by default.
ENDPOINT (optional) is the API endpoint for completions, defaults to
\"/v1/messages\".
HEADER (optional) is for additional headers to send with each
request. It should be an alist or a function that retuns an
alist, like:
((\"Content-Type\" . \"application/json\"))
KEY is a variable whose value is the API key, or function that
returns the key."
(declare (indent 1))
(let ((backend (gptel--make-anthropic
:curl-args curl-args
:name name
:host host
:header header
:key key
:models models
:protocol protocol
:endpoint endpoint
:stream stream
:url (if protocol
(concat protocol "://" host endpoint)
(concat host endpoint)))))
(prog1 backend
(setf (alist-get name gptel--known-backends
nil nil #'equal)
backend))))
(provide 'gptel-anthropic)
;;; gptel-backends.el ends here