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guix: emacs-utils: Add emacs-header-parse.

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* guix/build/emacs-utils.scm (emacs-header-parse): New procedure.

* tests/build-emacs-utils.scm ("emacs-header-parse: fetch version",
  "emacs-header-parse: fetch keywords", "emacs-header-parse: fetch
  nonexistent author"): New tests.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Fredrik Salomonsson 2022-06-05 19:51:43 +00:00 committed by Ludovic Courtès
parent f8275916fc
commit c3afbd05bf
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GPG key ID: 090B11993D9AEBB5
2 changed files with 35 additions and 1 deletions
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9
guix/build/emacs-utils.scm
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@ -38,6 +38,7 @@ (define-module (guix build emacs-utils)
emacs-generate-autoloads
emacs-byte-compile-directory
emacs-header-parse
as-display
emacs-substitute-sexps
@ -114,6 +115,14 @@ (define* (emacs-byte-compile-directory dir)
(byte-recompile-directory (file-name-as-directory ,dir) 0 1))))
(emacs-batch-eval expr)))
(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))

27
tests/build-emacs-utils.scm
View file

@ -28,7 +28,7 @@ (define-module (test build-emacs-utils)
(test-begin "build-emacs-utils")
;; Only run the following tests if emacs is present.
(test-skip (if (which "emacs") 0 2))
(test-skip (if (which "emacs") 0 5))
(test-equal "emacs-batch-script: print foo from emacs"
"foo"
@ -40,4 +40,29 @@ (define-module (test build-emacs-utils)
"Lisp error: (wrong-type-argument numberp \"three\")")))
(emacs-batch-script '(mapcar 'number-to-string (list 1 2 "three")))))
(call-with-temporary-directory
(lambda (directory)
(let ((mock-elisp-file (string-append directory "/foo.el")))
(call-with-output-file mock-elisp-file
(lambda (port)
(display ";;; foo --- mock emacs package -*- lexical-binding: t -*-
;; Created: 4 Jun 2022
;; Keywords: lisp test
;; Version: 1.0.0
;;; Commentary:
;;; Code:
;;; foo.el ends here
"
port)))
(test-equal "emacs-header-parse: fetch version"
"1.0.0"
(emacs-header-parse "version" mock-elisp-file))
(test-equal "emacs-header-parse: fetch keywords"
"lisp test"
(emacs-header-parse "keywords" mock-elisp-file))
(test-equal "emacs-header-parse: fetch nonexistent author"
"nil"
(emacs-header-parse "author" mock-elisp-file)))))
(test-end "build-emacs-utils")