From c5c82d906882c0669d61f21d0cca127d19115aa7 Mon Sep 17 00:00:00 2001
From: JenChieh <jcs090218@gmail.com>
Date: Fri, 3 Nov 2023 01:06:41 -0700
Subject: [PATCH] fix: Improve license detection

---
 lisp/lint/license.el | 76 +++++++++++++++++++++++++++++---------------
 1 file changed, 50 insertions(+), 26 deletions(-)

diff --git a/lisp/lint/license.el b/lisp/lint/license.el
index 52bbff11..2b488057 100644
--- a/lisp/lint/license.el
+++ b/lisp/lint/license.el
@@ -14,6 +14,11 @@
                           (locate-dominating-file dir "_prepare.el"))
         nil t))
 
+;;
+;;; Externals
+
+(require 'whitespace nil t)
+
 ;;
 ;;; Flags
 
@@ -22,52 +27,71 @@
 ;;
 ;;; Core
 
-(defun eask--string-match-all (regexps)
-  "Return t when every REGEXPS match the `buffer-string'."
-  (cl-every (lambda (regexp)
-              (string-match-p regexp (buffer-string)))
-            regexps))
+(defun eask--string-match-all (contents)
+  "Return t when every CONTENTS match the `buffer-string'."
+  (cl-every (lambda (content)
+              (string-match-p (eask-s-replace "\n" " " content) (buffer-string)))
+            contents))
 
 (defun eask--scan-license (file)
   "Scan the license FILE."
-  (with-current-buffer (find-file file)
+  (with-temp-buffer
+    (insert-file-contents file)
+    (let ((whitespace-style '(trailing)))
+      (whitespace-cleanup))
+    (let ((content (eask-s-replace "\n" " " (buffer-string))))
+      (erase-buffer)
+      (insert content))
     ;; See https://api.github.com/licenses
     (cond
-     ((eask--string-match-all '("GNU AFFERO GENERAL PUBLIC LICENSE"
-                                "Version 3"
-                                "You should have received a copy of the GNU Affero General Public License"))
+     ((eask--string-match-all
+       '("You should have received a copy of the GNU Affero General Public License"))
       '("agpl-3.0" "GNU Affero General Public License v3.0" "AGPL-3.0"))
-     ((eask--string-match-all '("Apache"
-                                "http://www.apache.org/licenses/"))
+     ((eask--string-match-all
+       '("Licensed under the Apache License, Version 2.0"))
       '("apache-2.0" "Apache License 2.0" "Apache-2.0"))
-     ((eask--string-match-all '("BSD 2-Clause"))
+     ((eask--string-match-all
+       '("Redistribution and use in source and binary forms"
+         "Redistributions in binary form must reproduce"))
       '("bsd-2-clause" "BSD 2-Clause \"Simplified\" License" "BSD-2-Clause"))
-     ((eask--string-match-all '("BSD 3-Clause"))
+     ((eask--string-match-all
+       '("Redistribution and use in source and binary forms"
+         "Neither the name of the copyright holder nor"))
       '("bsd-3-clause" "BSD 3-Clause \"New\" or \"Revised\" License" "BSD-3-Clause"))
-     ((eask--string-match-all '("Boost Software License - Version 1.0"))
+     ((eask--string-match-all
+       '("Permission is hereby granted, free of charge, to any person or organization"))
       '("bsl-1.0" "Boost Software License 1.0" "BSL-1.0"))
      ((eask--string-match-all '("CC0 1.0"))
       '("cc0-1.0" "Creative Commons Zero v1.0 Universal" "CC0-1.0"))
-     ((eask--string-match-all '("Eclipse Public License - v 2.0"
-                                "Eclipse Foundation"))
+     ((eask--string-match-all
+       '("Eclipse Public License - v 2.0"
+         "Eclipse Foundation"))
       '("epl-2.0" "Eclipse Public License 2.0" "EPL-2.0"))
-     ((eask--string-match-all '("GNU General Public License"
-                                "Version 2"))
+     ((eask--string-match-all
+       '("Copying and distribution of this file, with or without"))
+      '("fsfap" "FSF All Permissive License" "FSFAP"))
+     ((eask--string-match-all
+       '("is free software." "you can redistribute it"
+         "version 2 of the"))
       '("gpl-2.0" "GNU General Public License v2.0" "GPL-2.0"))
-     ((eask--string-match-all '("GNU General Public License"
-                                "version 3"
-                                "You should have received a copy of the GNU General Public License"))
+     ((eask--string-match-all
+       '("is free software." "you can redistribute it"
+         "version 3 of the"))
       '("gpl-3.0" "GNU General Public License v3.0" "GPL-3.0"))
+     ((eask--string-match-all
+       '("Permission to use, copy, modify, and/or distribute this"))
+      '("isc" " Internet Systems Consortium" "ISC"))
      ((eask--string-match-all '("Lesser GPL"
                                 "Version 2.1"))
       '("lgpl-2.1" "GNU Lesser General Public License v2.1" "LGPL-2.1"))
-     ((eask--string-match-all '("Permission is hereby granted, free of charge, to any person obtaining a copy"))
+     ((eask--string-match-all
+       '("Permission is hereby granted, free of charge, to any person"))
       '("mit" "MIT License" "MIT"))
-     ((eask--string-match-all '("Mozilla Public License Version 2.0"
-                                "http://mozilla.org/MPL/2.0/"))
+     ((eask--string-match-all
+       '("http://mozilla.org/MPL/2.0/"))
       '("mpl-2.0" "Mozilla Public License 2.0" "MPL-2.0"))
-     ((eask--string-match-all '("This is free and unencumbered software released into the public domain"
-                                "https://unlicense.org"))
+     ((eask--string-match-all
+       '("This is free and unencumbered software released into"))
       '("unlicense" "The Unlicense" "Unlicense"))
      (t
       '("unknown" "Unknown license" "unknown")))))