feat: add support for the fabrica coding agent

README.org

@@ -176,6 +176,15 @@ npm install -g pi-acp
 
 See https://github.com/svkozak/pi-acp for details.
 
+
+*** For the Fabrica coding agent, install fabrica-cli
+
+#+begin_src bash
+cargo install fabrica-cli
+#+end_src
+
+See https://github.com/Endi1/fabrica for details.
+
 ** Installation
 
 =agent-shell= is powered by built-in =comint-shell=, via [[https://github.com/xenodium/shell-maker][shell-maker]], available on [[https://melpa.org/#/shell-maker][MELPA]].
@@ -443,6 +452,7 @@ Start a specific agent shell session directly:
 - =M-x agent-shell-qwen-start= - Start a Qwen Code agent session
 - =M-x agent-shell-droid-start-agent= - Start a Factory Droid agent session
 - =M-x agent-shell-pi-start-agent= - Start a Pi coding agent session
+- =M-x agent-shell-fabrica-start-agent= - Start a Fabrica coding agent session
 
 *** Setting a default agent for all new shells
 

agent-shell-fabrica.el

@@ -0,0 +1,114 @@
+;;; agent-shell-fabrica.el --- Fabrica coding agent configurations -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2024 Alvaro Ramirez
+
+;; Author: Alvaro Ramirez https://xenodium.com
+;; URL: https://github.com/xenodium/agent-shell
+
+;; This package 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, or (at your option)
+;; any later version.
+
+;; This package 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; This file includes Fabrica coding agent specific configurations.
+;;
+;; Fabrica is a terminal-based coding agent built in Rust with built-in
+;; ACP support.  See https://github.com/Endi1/fabrica
+;;
+;; Fabrica supports multiple providers (Google Gemini, Anthropic Claude,
+;; OpenAI) and includes built-in tools for file operations and shell
+;; commands.
+;;
+
+;;; Code:
+
+(eval-when-compile
+  (require 'cl-lib))
+(require 'shell-maker)
+(require 'acp)
+
+(declare-function agent-shell--indent-string "agent-shell")
+(declare-function agent-shell-make-agent-config "agent-shell")
+(autoload 'agent-shell-make-agent-config "agent-shell")
+(declare-function agent-shell--make-acp-client "agent-shell")
+(declare-function agent-shell--dwim "agent-shell")
+
+(defcustom agent-shell-fabrica-acp-command
+  '("fabrica" "serve")
+  "Command and parameters for the Fabrica ACP client.
+
+The first element is the command name, and the rest are command parameters.
+
+Fabrica has built-in ACP support via its `serve' subcommand."
+  :type '(repeat string)
+  :group 'agent-shell)
+
+(defun agent-shell-fabrica-make-agent-config ()
+  "Create a Fabrica coding agent configuration.
+
+Returns an agent configuration alist using `agent-shell-make-agent-config'."
+  (agent-shell-make-agent-config
+   :identifier 'fabrica
+   :mode-line-name "Fabrica"
+   :buffer-name "Fabrica"
+   :shell-prompt "Fabrica> "
+   :shell-prompt-regexp "Fabrica> "
+   :welcome-function #'agent-shell-fabrica--welcome-message
+   :client-maker (lambda (buffer)
+                   (agent-shell-fabrica-make-client :buffer buffer))
+   :install-instructions "Install with: cargo install fabrica-cli
+See https://github.com/Endi1/fabrica for details."))
+
+(defun agent-shell-fabrica-start-agent ()
+  "Start an interactive Fabrica coding agent shell."
+  (interactive)
+  (agent-shell--dwim :config (agent-shell-fabrica-make-agent-config)
+                     :new-shell t))
+
+(cl-defun agent-shell-fabrica-make-client (&key buffer)
+  "Create a Fabrica client using BUFFER as context.
+
+Fabrica loads API keys from its own config file and/or
+environment variables."
+  (unless buffer
+    (error "Missing required argument: :buffer"))
+  (agent-shell--make-acp-client :command (car agent-shell-fabrica-acp-command)
+                                :command-params (cdr agent-shell-fabrica-acp-command)
+                                :context-buffer buffer))
+
+(defun agent-shell-fabrica--welcome-message (config)
+  "Return Fabrica welcome message using `shell-maker' CONFIG."
+  (let ((art (agent-shell--indent-string 4 (agent-shell-fabrica--ascii-art)))
+        (message (string-trim-left (shell-maker-welcome-message config) "\n")))
+    (concat "\n\n"
+            art
+            "\n\n"
+            message)))
+
+(defun agent-shell-fabrica--ascii-art ()
+  "Fabrica ASCII art."
+  (let* ((is-dark (eq (frame-parameter nil 'background-mode) 'dark))
+         (text (string-trim "
+░░░░░░░░░░   ░░░░░░░    ░░░░░░░░░    ░░░░░░░░     ░░░    ░░░░░░░     ░░░░░░░
+░░░         ░░░   ░░░   ░░░    ░░░   ░░░    ░░░   ░░░   ░░░   ░░░   ░░░   ░░░
+░░░░░░░░    ░░░░░░░░░   ░░░░░░░░░    ░░░░░░░░     ░░░   ░░░         ░░░░░░░░░
+░░░         ░░░   ░░░   ░░░    ░░░   ░░░    ░░░   ░░░   ░░░   ░░░   ░░░   ░░░
+░░░         ░░░   ░░░   ░░░░░░░░     ░░░    ░░░   ░░░    ░░░░░░░    ░░░   ░░░
+" "\n")))
+    (propertize text 'font-lock-face (if is-dark
+                                         '(:foreground "#e0a526" :inherit fixed-pitch)
+                                       '(:foreground "#b8860b" :inherit fixed-pitch)))))
+
+(provide 'agent-shell-fabrica)
+
+;;; agent-shell-fabrica.el ends here

agent-shell.el

@@ -56,6 +56,7 @@
 (require 'agent-shell-devcontainer)
 (require 'agent-shell-diff)
 (require 'agent-shell-experimental)
+(require 'agent-shell-fabrica)
 (require 'agent-shell-droid)
 (require 'agent-shell-github)
 (require 'agent-shell-google)
@@ -502,6 +503,7 @@ Goose, Cursor, Auggie, and others."
         (agent-shell-openai-make-codex-config)
         (agent-shell-cursor-make-agent-config)
         (agent-shell-droid-make-agent-config)
+        (agent-shell-fabrica-make-agent-config)
         (agent-shell-github-make-copilot-config)
         (agent-shell-google-make-gemini-config)
         (agent-shell-goose-make-agent-config)