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;;; llm-chat-gemini.el --- Implements gemini llm intergration -*- lexical-binding: t; -*-
;; This file is not part of GNU Emacs.
;;; License:
;; llm-chat-gemini.el 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.
;; llm-chat-gemini.el 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/>.
;;; Code:
(require 'llm-chat-api)
(defvar llm-chat-gemini-models '("gemini-2.5-flash-preview-04-17" "gemini-2.5-pro-preview-03-25" "gemini-2.0-flash-lite" "gemini-1.5-flash" "gemini-1.5-flash-8b" "gemini-1.5-pro"))
(cl-defgeneric llm-chat-resolve-model-backend ((backend (eql 'gemini))
model)
(if (member model llm-chat-gemini-models)
t))
(defun llm-chat-gemini-get-model ()
(if (member (llm-chat-get-model) llm-chat-gemini-models)
(llm-chat-get-model)
"gemini-2.0-flash-lite"))
(defun llm-chat-gemini-convert-history-contents ()
(let ((contents '()))
(dolist (history (llm-chat-get-history))
(let ((role (cdr (car history)))
(text (cdr (car (cdr history)))))
(cond ((or (string= role "user") (string= role "system"))
(setq contents (append contents `((role . "user")
(parts . (((text . ,text))))))))
((string= role "assistant")
(setq contents (append contents `((role . "model")
(parts . (((text . ,text)))))))))))
contents))
(defun llm-chat-gemini-json ()
(let ((json-object `((contents . (,(llm-chat-gemini-convert-history-contents)))
(generation_config . ((temperature . ,(llm-chat-get-temperature)))))))
(json-encode json-object)))
(defun llm-chat-gemini-headers (backend)
())
(defun llm-chat-make-gemini-backend ()
(make-llm-chat-backend
:api-endpoint (concat "https://generativelanguage.googleapis.com/v1beta/models/"
(llm-chat-gemini-get-model)
":streamGenerateContent?key="
(auth-source-pick-first-password :host "api.gemini.com"))
:api-key (auth-source-pick-first-password :host "api.gemini.com")
:headers-fn #'llm-chat-gemini-headers
:json-fn #'llm-chat-gemini-json
:filter-fn #'llm-chat-gemini-filter))
(defun llm-chat-gemini-filter (proc string)
"Buffer incomplete JSON until a complete object is received, then parse."
(setq llm-chat--incomplete (concat llm-chat--incomplete string))
;; Try to find a complete JSON object (simple heuristic: first { to last })
(write-region string nil "/tmp/stream.txt" t)
(when (and (string-match "{" llm-chat--incomplete)
(string-match "}[[:space:]]*\\'" llm-chat--incomplete))
(let ((json-str (substring llm-chat--incomplete
(string-match "{" llm-chat--incomplete))))
(condition-case err
(let* ((json-object (json-read-from-string json-str))
(candidates (alist-get 'candidates json-object))
(first-candidate (if (vectorp candidates) (aref candidates 0) nil))
(content (when first-candidate
(alist-get 'content first-candidate)))
(parts (when content (alist-get 'parts content)))
(text-part (when (and parts (vectorp parts) (> (length parts) 0))
(alist-get 'text (aref parts 0))))
(finish-reason (when first-candidate
(alist-get 'finishReason first-candidate))))
(with-current-buffer (get-buffer-create "*LLM Chat*")
(save-excursion
(goto-char (point-max))
(when text-part
(if (not (llm-chat-get-buffer))
(progn
(if (not (bolp)) (insert "\n"))
(insert "(AI): ")))
(insert text-part)
(llm-chat-set-buffer (concat (or (llm-chat-get-buffer) "") text-part)))
(when (and finish-reason (string= finish-reason "STOP"))
(if (not (bolp)) (insert "\n"))
(insert "(USR):")
(llm-chat-add-assistant-history (llm-chat-get-buffer))
(llm-chat-set-buffer nil)))))
(error
(message "Gemini filter: JSON parsing error: %s" (error-message-string err)))))
(setq llm-chat--incomplete "")))
;; (defun llm-chat-gemini-filter (proc string)
;; "Filter function to handle Gemini API JSON responses."
;; (with-current-buffer (get-buffer-create "*LLM Chat*")
;; (save-excursion
;; (goto-char (point-max))
;; (write-region (concat "start-----" string "-----end\n") nil "/tmp/stream.txt" t 'append)
;; ;; Try to extract JSON from the received string
;; (when-let* ((start-pos (string-match "{" string))
;; (json-string (substring string start-pos)))
;; (condition-case err
;; (let* ((json-object (json-read-from-string json-string))
;; (candidates (alist-get 'candidates json-object))
;; (first-candidate (if (vectorp candidates) (aref candidates 0) nil))
;; (content (when first-candidate
;; (alist-get 'content first-candidate)))
;; (parts (when content (alist-get 'parts content)))
;; (text-part (when (and parts (vectorp parts))
;; (alist-get 'text (aref parts 0))))
;; (finish-reason (when first-candidate
;; (alist-get 'finishReason first-candidate))))
;; (when text-part
;; (if (not (llm-chat-get-buffer))
;; (progn
;; (if (not (bolp))
;; (insert "\n"))
;; (insert "(AI): ")))
;; (insert text-part)
;; (llm-chat-set-buffer (concat (or (llm-chat-get-buffer) "") text-part)))
;; (when (and finish-reason (string= finish-reason "STOP"))
;; (if (not (bolp))
;; (insert "\n"))
;; (insert "(USR):")
;; (llm-chat-add-assistant-history (llm-chat-get-buffer))
;; (llm-chat-set-buffer nil))))))))
(defun llm-chat-gemini-print-content (string)
(let* ((json-object (json-read-from-string string))
(candidates (alist-get 'candidates json-object))
(first-candidate (aref candidates 0)))
(when-let* ((content (alist-get 'content first-candidate))
(parts (alist-get 'parts content))
(first-part (aref parts 0))
(text (alist-get 'text first-part)))
text)))
(provide 'llm-chat-gemini)
;;; llm-chat-gemini.el ends here
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