;;; files-tests.el --- tests for files.el.  -*- lexical-binding: t; -*-

;; Copyright (C) 2012-2017 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; 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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Code:

(require 'ert)
(require 'nadvice)

;; Set to t if the local variable was set, `query' if the query was
;; triggered.
(defvar files-test-result nil)

(defvar files-test-safe-result nil)
(put 'files-test-safe-result 'safe-local-variable 'booleanp)

(defun files-test-fun1 ()
  (setq files-test-result t))

;; Test combinations:
;; `enable-local-variables' t, nil, :safe, :all, or something else.
;; `enable-local-eval' t, nil, or something else.

(defvar files-test-local-variable-data
  ;; Unsafe eval form
  '((("eval: (files-test-fun1)")
     (t t         (eq files-test-result t))
     (t nil       (eq files-test-result nil))
     (t maybe     (eq files-test-result 'query))
     (nil t       (eq files-test-result nil))
     (nil nil     (eq files-test-result nil))
     (nil maybe   (eq files-test-result nil))
     (:safe t     (eq files-test-result nil))
     (:safe nil   (eq files-test-result nil))
     (:safe maybe (eq files-test-result nil))
     (:all t      (eq files-test-result t))
     (:all nil    (eq files-test-result nil))
     (:all maybe  (eq files-test-result t)) ; This combination is ambiguous.
     (maybe t     (eq files-test-result 'query))
     (maybe nil   (eq files-test-result nil))
     (maybe maybe (eq files-test-result 'query)))
    ;; Unsafe local variable value
    (("files-test-result: t")
     (t t         (eq files-test-result 'query))
     (t nil       (eq files-test-result 'query))
     (t maybe     (eq files-test-result 'query))
     (nil t       (eq files-test-result nil))
     (nil nil     (eq files-test-result nil))
     (nil maybe   (eq files-test-result nil))
     (:safe t     (eq files-test-result nil))
     (:safe nil   (eq files-test-result nil))
     (:safe maybe (eq files-test-result nil))
     (:all t      (eq files-test-result t))
     (:all nil    (eq files-test-result t))
     (:all maybe  (eq files-test-result t))
     (maybe t     (eq files-test-result 'query))
     (maybe nil   (eq files-test-result 'query))
     (maybe maybe (eq files-test-result 'query)))
    ;; Safe local variable
    (("files-test-safe-result: t")
     (t t         (eq files-test-safe-result t))
     (t nil       (eq files-test-safe-result t))
     (t maybe     (eq files-test-safe-result t))
     (nil t       (eq files-test-safe-result nil))
     (nil nil     (eq files-test-safe-result nil))
     (nil maybe   (eq files-test-safe-result nil))
     (:safe t     (eq files-test-safe-result t))
     (:safe nil   (eq files-test-safe-result t))
     (:safe maybe (eq files-test-safe-result t))
     (:all t      (eq files-test-safe-result t))
     (:all nil    (eq files-test-safe-result t))
     (:all maybe  (eq files-test-safe-result t))
     (maybe t     (eq files-test-result 'query))
     (maybe nil   (eq files-test-result 'query))
     (maybe maybe (eq files-test-result 'query)))
    ;; Safe local variable with unsafe value
    (("files-test-safe-result: 1")
     (t t         (eq files-test-result 'query))
     (t nil       (eq files-test-result 'query))
     (t maybe     (eq files-test-result 'query))
     (nil t       (eq files-test-safe-result nil))
     (nil nil     (eq files-test-safe-result nil))
     (nil maybe   (eq files-test-safe-result nil))
     (:safe t     (eq files-test-safe-result nil))
     (:safe nil   (eq files-test-safe-result nil))
     (:safe maybe (eq files-test-safe-result nil))
     (:all t      (eq files-test-safe-result 1))
     (:all nil    (eq files-test-safe-result 1))
     (:all maybe  (eq files-test-safe-result 1))
     (maybe t     (eq files-test-result 'query))
     (maybe nil   (eq files-test-result 'query))
     (maybe maybe (eq files-test-result 'query))))
  "List of file-local variable tests.
Each list element should have the form

  (LOCAL-VARS-LIST . TEST-LIST)

where LOCAL-VARS-LISTS should be a list of local variable
definitions (strings) and TEST-LIST is a list of tests to
perform.  Each entry of TEST-LIST should have the form

 (ENABLE-LOCAL-VARIABLES ENABLE-LOCAL-EVAL FORM)

where ENABLE-LOCAL-VARIABLES is the value to assign to
`enable-local-variables', ENABLE-LOCAL-EVAL is the value to
assign to `enable-local-eval', and FORM is a desired `should'
form.")

(defun file-test--do-local-variables-test (str test-settings)
  (with-temp-buffer
    (insert str)
    (setq files-test-result nil
	  files-test-safe-result nil)
    (let ((enable-local-variables (nth 0 test-settings))
	  (enable-local-eval      (nth 1 test-settings))
	  ;; Prevent any dir-locals file interfering with the tests.
	  (enable-dir-local-variables nil))
      (hack-local-variables)
      (eval (nth 2 test-settings)))))

(ert-deftest files-test-local-variables ()
  "Test the file-local variables implementation."
  (unwind-protect
      (progn
	(defadvice hack-local-variables-confirm (around files-test activate)
	  (setq files-test-result 'query)
	  nil)
	(dolist (test files-test-local-variable-data)
	  (let ((str (concat "text\n\n;; Local Variables:\n;; "
			     (mapconcat 'identity (car test) "\n;; ")
			     "\n;; End:\n")))
	    (dolist (subtest (cdr test))
	      (should (file-test--do-local-variables-test str subtest))))))
    (ad-disable-advice 'hack-local-variables-confirm 'around 'files-test)))

(defvar files-test-bug-18141-file
  (expand-file-name "data/files-bug18141.el.gz" (getenv "EMACS_TEST_DIRECTORY"))
  "Test file for bug#18141.")

(ert-deftest files-test-bug-18141 ()
  "Test for http://debbugs.gnu.org/18141 ."
  (skip-unless (executable-find "gzip"))
  (let ((tempfile (make-temp-file "files-test-bug-18141" nil ".gz")))
    (unwind-protect
	(progn
	  (copy-file files-test-bug-18141-file tempfile t)
	  (with-current-buffer (find-file-noselect tempfile)
	    (set-buffer-modified-p t)
	    (save-buffer)
	    (should (eq buffer-file-coding-system 'iso-2022-7bit-unix))))
      (delete-file tempfile))))

(ert-deftest files-test-make-temp-file-empty-prefix ()
  "Test make-temp-file with an empty prefix."
  (let ((tempfile (make-temp-file ""))
        (tempdir (make-temp-file "" t))
        (tempfile-. (make-temp-file "."))
        (tempdir-. (make-temp-file "." t))
        (tempfile-.. (make-temp-file ".."))
        (tempdir-.. (make-temp-file ".." t)))
    (dolist (file (list tempfile tempfile-. tempfile-..))
      (should file)
      (delete-file file))
    (dolist (dir (list tempdir tempdir-. tempdir-..))
      (should dir)
      (delete-directory dir))))

;; Stop the above "Local Var..." confusing Emacs.
\f

(ert-deftest files-test-bug-21454 ()
  "Test for http://debbugs.gnu.org/21454 ."
  :expected-result :failed
  (let ((input-result
         '(("/foo/bar//baz/:/bar/foo/baz//" nil ("/foo/bar/baz/" "/bar/foo/baz/"))
           ("/foo/bar/:/bar/qux/:/qux/foo" nil ("/foo/bar/" "/bar/qux/" "/qux/foo/"))
           ("//foo/bar/:/bar/qux/:/qux/foo/" nil ("/foo/bar/" "/bar/qux/" "/qux/foo/"))
           ("/foo/bar/:/bar/qux/:/qux/foo/" nil ("/foo/bar/" "/bar/qux/" "/qux/foo/"))
           ("/foo//bar/:/bar/qux/:/qux/foo/" nil ("/foo/bar/" "/bar/qux/" "/qux/foo/"))
           ("/foo//bar/:/bar/qux/:/qux/foo" nil ("/foo/bar/" "/bar/qux/" "/qux/foo/"))
           ("/foo/bar" "$FOO/baz/:/qux/foo/" ("/foo/bar/baz/" "/qux/foo/"))
           ("//foo/bar/" "$FOO/baz/:/qux/foo/" ("/foo/bar/baz/" "/qux/foo/"))))
        (foo-env (getenv "FOO"))
        (bar-env (getenv "BAR")))
    (unwind-protect
        (dolist (test input-result)
          (let ((foo (nth 0 test))
                (bar (nth 1 test))
                (res (nth 2 test)))
            (setenv "FOO" foo)
            (if bar
                (progn
                  (setenv "BAR" bar)
                  (should (equal res (parse-colon-path (getenv "BAR")))))
              (should (equal res (parse-colon-path "$FOO"))))))
      (setenv "FOO" foo-env)
      (setenv "BAR" bar-env))))

(ert-deftest files-test--save-buffers-kill-emacs--confirm-kill-processes ()
  "Test that `save-buffers-kill-emacs' honors
`confirm-kill-processes'."
  (cl-letf* ((yes-or-no-p-prompts nil)
             ((symbol-function #'yes-or-no-p)
              (lambda (prompt)
                (push prompt yes-or-no-p-prompts)
                nil))
             (kill-emacs-args nil)
             ((symbol-function #'kill-emacs)
              (lambda (&optional arg) (push arg kill-emacs-args)))
             (process
              (make-process
               :name "sleep"
               :command (list
                         (expand-file-name invocation-name invocation-directory)
                         "-batch" "-Q" "-eval" "(sleep-for 1000)")))
             (confirm-kill-processes nil))
    (save-buffers-kill-emacs)
    (kill-process process)
    (should-not yes-or-no-p-prompts)
    (should (equal kill-emacs-args '(nil)))))

(ert-deftest files-test-read-file-in-~ ()
  "Test file prompting in directory named '~'.
If we are in a directory named '~', the default value should not
be $HOME."
  (cl-letf (((symbol-function 'completing-read)
             (lambda (_prompt _coll &optional _pred _req init _hist def _)
               (or def init)))
            (dir (make-temp-file "read-file-name-test" t)))
    (unwind-protect
        (let ((subdir (expand-file-name "./~/" dir)))
          (make-directory subdir t)
          (with-temp-buffer
            (setq default-directory subdir)
            (should-not (equal
                         (expand-file-name (read-file-name "File: "))
                         (expand-file-name "~/")))
            ;; Don't overquote either!
            (setq default-directory (concat "/:" subdir))
            (should-not (equal
                         (expand-file-name (read-file-name "File: "))
                         (concat "/:/:" subdir)))))
      (delete-directory dir 'recursive))))

(ert-deftest files-tests--file-name-non-special--subprocess ()
  "Check that Bug#25949 is fixed."
  (skip-unless (executable-find "true"))
  (let ((defdir (if (memq system-type '(ms-dos windows-nt)) "/:c:/" "/:/")))
    (should (eq (let ((default-directory defdir)) (process-file "true")) 0))
    (should (processp (let ((default-directory defdir))
                        (start-file-process "foo" nil "true"))))
    (should (eq (let ((default-directory defdir)) (shell-command "true")) 0))))

(defmacro files-tests--with-advice (symbol where function &rest body)
  (declare (indent 3))
  (cl-check-type symbol symbol)
  (cl-check-type where keyword)
  (cl-check-type function function)
  (macroexp-let2 nil function function
    `(progn
       (advice-add #',symbol ,where ,function)
       (unwind-protect
           (progn ,@body)
         (advice-remove #',symbol ,function)))))

(defmacro files-tests--with-temp-file (name &rest body)
  (declare (indent 1))
  (cl-check-type name symbol)
  `(let ((,name (make-temp-file "emacs")))
     (unwind-protect
         (progn ,@body)
       (delete-file ,name))))

(ert-deftest files-tests--file-name-non-special--buffers ()
  "Check that Bug#25951 is fixed.
We call `verify-visited-file-modtime' on a buffer visiting a file
with a quoted name.  We use two different variants: first with
the buffer current and a nil argument, second passing the buffer
object explicitly.  In both cases no error should be raised and
the `file-name-non-special' handler for quoted file names should
be invoked with the right arguments."
  (files-tests--with-temp-file temp-file-name
    (with-temp-buffer
     (let* ((buffer-visiting-file (current-buffer))
            (actual-args ())
            (log (lambda (&rest args) (push args actual-args))))
       (insert-file-contents (concat "/:" temp-file-name) :visit)
       (should (stringp buffer-file-name))
       (should (string-prefix-p "/:" buffer-file-name))
       (should (consp (visited-file-modtime)))
       (should (equal (find-file-name-handler buffer-file-name
                                              #'verify-visited-file-modtime)
                      #'file-name-non-special))
       (files-tests--with-advice file-name-non-special :before log
         ;; This should call the file name handler with the right
         ;; buffer and not signal an error.  The file hasn't been
         ;; modified, so `verify-visited-file-modtime' should return
         ;; t.
         (should (equal (verify-visited-file-modtime) t))
         (with-temp-buffer
           (should (stringp (buffer-file-name buffer-visiting-file)))
           ;; This should call the file name handler with the right
           ;; buffer and not signal an error.  The file hasn't been
           ;; modified, so `verify-visited-file-modtime' should return
           ;; t.
           (should (equal (verify-visited-file-modtime buffer-visiting-file)
                          t))))
       ;; Verify that the handler was actually called.  We called
       ;; `verify-visited-file-modtime' twice, so both calls should be
       ;; recorded in reverse order.
       (should (equal actual-args
                      `((verify-visited-file-modtime ,buffer-visiting-file)
                        (verify-visited-file-modtime nil))))))))

(ert-deftest files-tests--insert-directory-wildcard-in-dir-p ()
  (let ((alist (list (cons "/home/user/*/.txt" (cons "/home/user/" "*/.txt"))
                     (cons "/home/user/.txt" nil)
                     (cons "/home/*/.txt" (cons "/home/" "*/.txt"))
                     (cons "/home/*/" (cons "/home/" "*/"))
                     (cons "/*/.txt" (cons "/" "*/.txt"))
                     ;;
                     (cons "c:/tmp/*/*.txt" (cons "c:/tmp/" "*/*.txt"))
                     (cons "c:/tmp/*.txt" nil)
                     (cons "c:/tmp/*/" (cons "c:/tmp/" "*/"))
                     (cons "c:/*/*.txt" (cons "c:/" "*/*.txt")))))
    (dolist (path-res alist)
      (should
       (equal
        (cdr path-res)
        (insert-directory-wildcard-in-dir-p (car path-res)))))))

(ert-deftest file-modes-symbolic-to-number ()
  (let ((alist '(("a=rwx" . 511)
                 ("o=t" . 512)
                 ("o=xt" . 513)
                 ("o=tx" . 513) ; Order doesn't matter.
                 ("u=rwx,g=rx,o=rx" . 493)
                 ("u=rwx,g=,o=" . 448)
                 ("u=rwx" . 448) ; Empty permissions can be ignored.
                 ("u=rw,g=r,o=r" . 420)
                 ("u=rw,g=r,o=t" . 928)
                 ("u=rw,g=r,o=xt" . 929)
                 ("u=rwxs,g=rs,o=xt" . 4065)
                 ("u=rws,g=rs,o=t" . 4000)
                 ("u=rws,g=rs,o=r" . 3492)
                 ("a=r" . 292)
                 ("u=S")
                 ("u=T")
                 ("u=Z"))))
    (dolist (x alist)
      (if (cdr-safe x)
          (equal (cdr-safe x) (file-modes-symbolic-to-number (car x)))
        (should-error (file-modes-symbolic-to-number (car x)))))))

(ert-deftest file-modes-number-to-symbolic ()
  (let ((from 644)
        (fn #'file-modes-number-to-symbolic)
        ;; Alist of the form (MODE RES1 RES2 RES3),
        ;; MODE is the first argument of FN.
        ;; RES1, the result of calling FN with 1 argument.
        ;; RES2, the result of calling FN with 2nd arg non-nil.
        ;; RES3, the result of calling FN with 2nd arg non-nil and 3rd arg FROM.
        (alist '((493 "-rwxr-xr-x" "u=rwx,g=rx,o=rx" "u+r+x,g+r+x,o+xt")
                 (448 "-rwx------" "u=rwx,g=,o=" "u+r+x,o-r-t")
                 (420 "-rw-r--r--" "u=rw,g=r,o=r" "u+r,g+r,o-t")
                 (928 "-rw-r----T" "u=rw,g=rx,o=r" "u+r,g+r,o-r")
                 (929 "-rw-r----t" "u=rw,g=rx,o=rx" "u+r,g+r,o-r+x")
                 (4065 "-rwsr-S--t" "u=rws,g=rS,o=t" "u+r+xs,g+r+s,o-r+x")
                 (4000 "-rwSr-S--T" "u=rwS,g=rS,o=T" "u+r+s,g+r+s,o-r")
                 (3492 "-rwSr-Sr--" "u=rwS,g=rS,o=r" "u+r+s,g+r+s,o-t")
                 (292 "-r--r--r--" "u=r,g=r,o=r" "u+r-w,g+r,o-t")
                 ("u=S")
                 ("u=T")
                 ("u=Z"))))
    (dolist (x alist)
      (cond ((cdr-safe x)
             (let ((res1 (cadr x)) (res2 (caddr x)) (res3 (cadddr x)))
               (equal res1 (funcall fn (car x)))
               ;; FROM is ignored when DETAILED is nil.
               (equal res1 (funcall fn (car x) nil from))
               (equal res2 (funcall fn (car x) 'detailed))
               (equal res3 (funcall fn (car x) 'detailed from))))
            (t (should-error (funcall fn (car x))))))))

(ert-deftest file-modes-number-to-symbolic-inverse ()
  (dotimes (i 4096) ; from 0 to 7777 in octal.
    ;; If neithr sticky bit nor set_uid not set_gid are set, then
    ;; `file-modes-symbolic-to-number' is the inverse of
    ;; `file-modes-number-to-symbolic'.
    (when (and (zerop (logand i 512))
               (zerop (logand i 1024))
               (zerop (logand i 2048)))
      (should
       (= i
          (file-modes-symbolic-to-number
           (file-modes-number-to-symbolic i t)))))))

(provide 'files-tests)
;;; files-tests.el ends here