;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014, 2018 Mark H Weaver ;;; Copyright © 2014 Alex Kost ;;; Copyright © 2018, 2020, 2022 Maxim Cournoyer ;;; Copyright © 2019 Liliana Marie Prikler ;;; Copyright © 2022 Fredrik Salomonsson ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix 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. ;;; ;;; GNU Guix 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 Guix. If not, see . (define-module (guix build emacs-utils) #:use-module (guix build utils) #:use-module (ice-9 format) #:use-module (ice-9 popen) #:use-module (ice-9 rdelim) #:use-module (srfi srfi-34) #:use-module (srfi srfi-35) #:export (%emacs emacs-batch-eval emacs-batch-edit-file emacs-batch-disable-compilation emacs-batch-script emacs-batch-error? emacs-batch-error-message emacs-generate-autoloads emacs-byte-compile-directory emacs-compile-directory emacs-header-parse as-display emacs-substitute-sexps emacs-substitute-variables)) ;;; Commentary: ;;; ;;; Tools to programmatically edit files using Emacs, ;;; e.g. to replace entire s-expressions in elisp files. ;;; ;;; Code: (define %emacs ;; The `emacs' command. (make-parameter "emacs")) (define (expr->string expr) "Converts EXPR, an expression, into a string." (if (string? expr) expr (format #f "~s" expr))) (define* (emacs-batch-eval expr #:key dynamic?) "Run Emacs in batch mode, and execute the Elisp code EXPR. If DYNAMIC? is true, evaluate using dynamic scoping." (invoke (%emacs) "--quick" "--batch" (format #f "--eval=(eval '~a ~:[t~;nil~])" (expr->string expr) dynamic?))) (define (emacs-batch-edit-file file expr) "Load FILE in Emacs using batch mode, and execute the elisp code EXPR." (invoke (%emacs) "--quick" "--batch" (string-append "--visit=" file) (string-append "--eval=" (expr->string expr)))) (define (emacs-batch-disable-compilation file) (emacs-batch-edit-file file '(progn (add-file-local-variable 'no-byte-compile t) (basic-save-buffer)))) (define-condition-type &emacs-batch-error &error emacs-batch-error? (message emacs-batch-error-message)) (define (emacs-batch-script expr) "Execute the Elisp code EXPR in Emacs batch mode and return output." (let* ((error-pipe (pipe)) (port (parameterize ((current-error-port (cdr error-pipe))) (open-pipe* OPEN_READ (%emacs) "--quick" "--batch" (string-append "--eval=" (expr->string expr))))) (output (read-string port)) (status (close-pipe port))) (close-port (cdr error-pipe)) (unless (zero? status) (raise (condition (&emacs-batch-error (message (read-string (car error-pipe))))))) output)) (define (emacs-generate-autoloads name directory) "Generate autoloads for Emacs package NAME placed in DIRECTORY." (let* ((file (string-append directory "/" name "-autoloads.el")) (expr `(let ((backup-inhibited t) (generated-autoload-file ,file)) (update-directory-autoloads ,directory)))) (emacs-batch-eval expr #:dynamic? #t))) (define* (emacs-byte-compile-directory dir) "Byte compile all files in DIR and its sub-directories." (let ((expr `(progn (setq byte-compile-debug t) ; for proper exit status (byte-recompile-directory (file-name-as-directory ,dir) 0 1)))) (emacs-batch-eval expr))) (define* (emacs-compile-directory dir) "Compile all files in DIR to native code. If native code is not supported, compile to bytecode instead." (emacs-batch-eval `(let ((byte-compile-debug t) ; for proper exit status (byte+native-compile (native-comp-available-p)) (files (directory-files-recursively ,dir "\\.el$"))) (mapc (lambda (file) (let (byte-to-native-output-file ;; For trampoline compilations (native-compile-target-directory (file-name-directory file))) (if byte+native-compile (native-compile file (concat (file-name-sans-extension file) ".eln")) (byte-compile-file file)) ;; Sadly, we can't use pcase because quasiquote works different in ;; Emacs. See `batch-byte+native-compile' in comp.el for the ;; actual shape of byte-to-native-output-file. (unless (null byte-to-native-output-file) (rename-file (car byte-to-native-output-file) (cdr byte-to-native-output-file) t)))) files)) #:dynamic? #t)) (define (emacs-header-parse section file) "Parse the header SECTION in FILE and return it as a string." (emacs-batch-script `(progn (require 'lisp-mnt) (find-file ,file) (princ (lm-header ,section))))) (define as-display ;syntactic keyword for 'emacs-substitute-sexps' '(as display)) (define-syntax replacement-helper (syntax-rules (as-display) ((_ (leading-regexp replacement (as-display))) `(progn (goto-char (point-min)) (re-search-forward ,leading-regexp) (kill-sexp) (insert " ") (insert ,(format #f "~a" replacement)))) ((_ (leading-regexp replacement)) `(progn (goto-char (point-min)) (re-search-forward ,leading-regexp) (kill-sexp) (insert " ") (insert ,(format #f "~s" replacement)))))) (define-syntax emacs-substitute-sexps (syntax-rules () "Substitute the S-expression immediately following the first occurrence of LEADING-REGEXP by the string returned by REPLACEMENT in FILE. For example: (emacs-substitute-sexps \"w3m.el\" (\"defcustom w3m-command\" (string-append w3m \"/bin/w3m\")) (\"defvar w3m-image-viewer\" (string-append imagemagick \"/bin/display\"))) This replaces the default values of the `w3m-command' and `w3m-image-viewer' variables declared in `w3m.el' with the results of the `string-append' calls above. Note that LEADING-REGEXP uses Emacs regexp syntax. Here is another example that uses the '(as-display)' subform to avoid having the Elisp procedure symbol from being double quoted: (emacs-substitute-sexps \"gnugo.el\" (\"defvar gnugo-xpms\" \"#'gnugo-imgen-create-xpms\" (as-display))" ((_ file replacement-spec ...) (emacs-batch-edit-file file `(progn ,(replacement-helper replacement-spec) ... (basic-save-buffer)))))) (define-syntax emacs-substitute-variables (syntax-rules () "Substitute the default value of VARIABLE by the string returned by REPLACEMENT in FILE. For example: (emacs-substitute-variables \"w3m.el\" (\"w3m-command\" (string-append w3m \"/bin/w3m\")) (\"w3m-image-viewer\" (string-append imagemagick \"/bin/display\"))) This replaces the default values of the `w3m-command' and `w3m-image-viewer' variables declared in `w3m.el' with the results of the `string-append' calls above. Similarly to `emacs-substitute-sexps', the '(as-display)' subform can be used to have the replacement formatted like `display' would, which can be useful to avoid double quotes being added when the replacement is provided as a string." ((_ file (variable replacement modifier ...) ...) (emacs-substitute-sexps file ((string-append "(def[a-z]+[[:space:]\n]+" variable "\\>") replacement modifier ...) ...)))) ;;; emacs-utils.scm ends here