fix: Compatible to Emacs 26 (#209)

* fix: Compatible to Emacs 26

* Remove docker

* enhance

* Add legacy package-build

* remove 26.x link test

* revert build legacy

* insist remove 26.x

* fix docker ci

* try use find file

.github/workflows/exec.yml

@@ -31,7 +31,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - 26.3
           - 27.2
           - 28.2
           - 29.1

.github/workflows/link.yml

@@ -31,7 +31,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - 26.3
           - 27.2
           - 28.2
           - 29.1

lisp/_prepare.el

@@ -483,6 +483,21 @@ Arguments FNC and ARGS are used for advice `:around'."
 ;;
 ;;; Package
 
+(defun eask-use-legacy-package-build ()
+  "Return t if using the legacy `package-build' package."
+  (version< emacs-version "27.1"))
+
+(defun eask-load-legacy-package-build ()
+  "Load the legacy `package-build' package."
+  (when (eask-use-legacy-package-build)
+    (add-to-list 'load-path
+                 (format "%sextern/package-build/%s/"
+                         eask-lisp-root
+                         emacs-major-version)
+                 t)))
+
+(eask-load-legacy-package-build)
+
 (defun eask--update-exec-path ()
   "Add all bin directory to the variable `exec-path'."
   (dolist (entry (directory-files package-user-dir t directory-files-no-dot-files-regexp))
@@ -1460,7 +1475,11 @@ ELPA)."
         (eask-with-verbosity 'debug
           (eask-with-progress
             (ansi-blue (format "Generating recipe for package %s... " (ansi-yellow pkg)))
-            (write-region (pp-to-string recipe) nil (expand-file-name pkg github-elpa-recipes-dir))
+            (progn
+              (ignore-errors (make-directory github-elpa-recipes-dir t))
+              (with-current-buffer (find-file (expand-file-name pkg github-elpa-recipes-dir))
+                (insert (pp-to-string recipe))
+                (save-buffer)))
             (ansi-blue "done ✓")))
         (setq eask-depends-on-recipe-p t))
       recipe))))
@@ -1971,14 +1990,6 @@ variable we use to test validation."
     (eask-msg ""))
   (setq eask-lint-first-file-p t))
 
-;;
-;;; Externals
-
-(eask-load "extern/compat")
-(eask-load "extern/ansi")
-(eask-load "extern/package")
-(eask-load "extern/package-build")
-
 ;;
 ;;; API
 
@@ -1993,4 +2004,12 @@ variable we use to test validation."
   (setq eask-commands (delete-dups eask-commands))
   `(defun ,name nil ,@body))
 
+;;
+;;; Externals
+
+(eask-load "extern/compat")
+(eask-load "extern/ansi")
+(eask-load "extern/package")
+(eask-load "extern/package-build")
+
 ;;; _prepare.el ends here

lisp/extern/package-build/24/package-build-badges.el

@@ -0,0 +1,56 @@
+;;; package-build-badges.el --- Create batches for packages
+
+;; Copyright (C) 2011-2013 Donald Ephraim Curtis <dcurtis@milkbox.net>
+;; Copyright (C) 2012-2014 Steve Purcell <steve@sanityinc.com>
+;; Copyright (C) 2009 Phil Hagelberg <technomancy@gmail.com>
+
+;; Author: Donald Ephraim Curtis <dcurtis@milkbox.net>
+;; Keywords: tools
+
+;; This file is not (yet) part of GNU Emacs.
+;; However, it is distributed under the same license.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; In future we should provide a hook.  Note also that it would be
+;; straightforward to generate the SVG ourselves, which would save
+;; the network overhead.
+
+;;; Code:
+
+(require 'package-build)
+
+(defun package-build--write-melpa-badge-image (name version target-dir)
+  (shell-command
+   (mapconcat #'shell-quote-argument
+              (list "curl" "-f" "-o"
+                    (expand-file-name (concat name "-badge.svg") target-dir)
+                    (format "https://img.shields.io/badge/%s-%s-%s.svg"
+                            (if package-build-stable "melpa stable" "melpa")
+                            (url-hexify-string version)
+                            (if package-build-stable "3e999f" "922793")))
+              " ")))
+
+(provide 'package-build-badges)
+
+;; Local Variables:
+;; coding: utf-8
+;; checkdoc-minor-mode: 1
+;; indent-tabs-mode: nil
+;; End:
+;;; package-badges.el ends here