forked from FG42/FG42
99 lines
3.2 KiB
EmacsLisp
99 lines
3.2 KiB
EmacsLisp
;;; FG42 --- The mighty editor for the emacsians -*- lexical-binding: t; -*-
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;;
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;; Copyright (c) 2010-2024 Sameer Rahmani <lxsameer@gnu.org>
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;;
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;; Author: Sameer Rahmani <lxsameer@gnu.org>
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;; URL: https://devheroes.codes/FG42/FG42
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;; Version: 4.0.0
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;
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;;; Commentary:
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;; This is the builder script that takes the config.json from the input
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;; (typically provided by Nix). And generates appropriate Elisp file
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;; for the main FG42 Elsip code to load and use.
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;;
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;; Please note that this file runs with Emacs and not FG42.
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;;; Code:
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(when (not (json-available-p))
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(error "Error: libjasson support is missing"))
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;; Elisp's hashtables are not functional so I have to store the
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;; state like this, Ewwwwww!
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(defvar build-state '()
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"A list of expressions that will dump in the output at the end.")
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(defmacro with-json (var &rest body)
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"Read the json file from cli arguments, user VAR run the BODY on it."
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(declare (indent defun))
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`(let ((input-file (car command-line-args-left)))
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(message "Reading the input file: %s" input-file)
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(with-temp-buffer
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(insert-file-contents input-file)
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(let ((,var (json-parse-buffer)))
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,@body))))
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(defun generate-compile-time-requires (elisp-pkgs)
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"Generate a list of `require' forms of ELISP-PKGS for compile time."
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(when (> (length elisp-pkgs) 0)
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(add-to-list
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'build-state
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`(eval-when-compile
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,@(mapcar (lambda (pkg) `(require ',(intern pkg))) elisp-pkgs)))))
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(defun generate-generic-vars (k v)
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"Generate a list of vars for K and value V."
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(add-to-list 'build-state `(defvar ,(intern (format "fg42/%s" k)) ,v)))
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(defun fg42-config-key-handler (k v)
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"Handle the FG42 config K and its value V."
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(cond
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((string= k "requires")
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(generate-compile-time-requires v))
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(t (generate-generic-vars k v))))
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(defun fg42-handler (config)
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"Handle the CONFIG for FG42.
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CONFIG maps to the collective `config' value of Nix modules."
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(maphash #'fg42-config-key-handler config))
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(defun handle-conifg-for (k v)
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"Find the handler of K and its value V to it."
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(funcall (intern (format "%s-handler" k)) v))
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(defun handle-top-level (k v)
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"Handle the key K and value V form the top level of the JSON data."
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(when (not (string= k "fg42"))
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(error "Don't know how to handle '%s'" k))
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(handle-conifg-for k v))
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(with-json j
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;; TODO: To make it scale, may be let Nix modules
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;; plug into this script. There is a security
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;; rist though
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(maphash #'handle-top-level j)
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(with-temp-file (cadr command-line-args-left)
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(mapc (lambda (x) (print x (current-buffer))) build-state)))
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(provide 'build)
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;;; build.el ends here
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