From: Da Zhang <zhangda82@gmail.com>
To: bug-gnu-emacs@gnu.org
Subject: 24.5; shell-quote-argument in Emacs 24.5 and Emacs 25 on Windows cannot figure out path correctly
--text follows this line--


Dear Emacs developers/maintainers,

I am writing this email to report an issue that has been bothering me
for a while.

I use python mode (python.el) for some python programming. When I invoke
the command python-shell-send-buffer, my Emacs always reports "Searching
for program: no such file or directory,
c\:/Anaconda3/Scripts/ipython.exe".

I traced down the cause of this problem, and found the following lines
in python.el:
(defun python-shell-parse-command ()    ;FIXME: why name it "parse"?
  "Calculate the string used to execute the inferior Python process."
  ;; FIXME: process-environment doesn't seem to be used anywhere within
  ;; this let.
  (let ((process-environment (python-shell-calculate-process-environment))
        (exec-path (python-shell-calculate-exec-path)))
    (format "%s %s"
            ;; FIXME: Why executable-find?
            (shell-quote-argument (executable-find python-shell-interpreter))
            python-shell-interpreter-args)))

The function call
(shell-quote-argument (executable-find python-shell-interpreter))
changed the path of my python interpreter from
"c:/Anaconda3/Scripts/ipython.exe"
to
"c\\:/Anaconda3/Scripts/ipython.exe".

I worked around this problem by replacing the function call
(shell-quote-argument (executable-find python-shell-interpreter))
with
(executable-find python-shell-interpreter) ;; edited by DZ on
2015/06/05: (shell-quote-argument) caused the problem of
"c\\:/Anaconda3/Scripts/ipython.exe"

To further analyze the problem, I found the function
shell-quote-argument defined in subr.el does not deal with the case when
bash from cygwin is used.

(defun shell-quote-argument (argument)
  "Quote ARGUMENT for passing as argument to an inferior shell."
  (cond
   ((and (eq system-type 'windows-nt) (w32-shell-dos-semantics))
    ;; First, quote argument so that CommandLineToArgvW will
    ;; understand it.  See
    ;; http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
    ;; After we perform that level of quoting, escape shell
    ;; metacharacters so that cmd won't mangle our argument.  If the
    ;; argument contains no double quote characters, we can just
    ;; surround it with double quotes.  Otherwise, we need to prefix
    ;; each shell metacharacter with a caret.

    (setq argument
          ;; escape backslashes at end of string
          (replace-regexp-in-string
           "\\(\\\\*\\)$"
           "\\1\\1"
           ;; escape backslashes and quotes in string body
           (replace-regexp-in-string
            "\\(\\\\*\\)\""
            "\\1\\1\\\\\""
            argument)))

    (if (string-match "[%!\"]" argument)
        (concat
         "^\""
         (replace-regexp-in-string
          "\\([%!()\"<>&|^]\\)"
          "^\\1"
          argument)
         "^\"")
      (concat "\"" argument "\"")))
   (t
    (if (equal argument "")
        "''"
      ;; Quote everything except POSIX filename characters.
      ;; This should be safe enough even for really weird shells.
      (replace-regexp-in-string
       "\n" "'\n'"
       (replace-regexp-in-string "[^-0-9a-zA-Z_./\n]" "\\\\\\&" argument))))
   ))

I added the following lines in the cond statement, to solve the problem.
   ((and (eq system-type 'windows-nt) (if (string-match ".*cygwin.*" (w32-shell-name)) t nil)) ;; DZ's edit on 6/5/2015
    (if (equal argument "")
        "''"
      ;; Quote everything except POSIX filename characters.
      ;; This should be safe enough even for really weird shells.
      (replace-regexp-in-string
       "\n" "'\n'"
       (replace-regexp-in-string "[^-0-9a-zA-Z_./\n:]" "\\\\\\&" argument))))
   ((eq system-type 'ms-dos)
    ;; Quote using double quotes, but escape any existing quotes in
    ;; the argument with backslashes.
    (let ((result "")
          (start 0)
          end)
      (if (or (null (string-match "[^\"]" argument))
              (< (match-end 0) (length argument)))
          (while (string-match "[\"]" argument start)
            (setq end (match-beginning 0)
                  result (concat result (substring argument start end)
                                 "\\" (substring argument end (1+ end)))
                  start (1+ end))))
      (concat "\"" result (substring argument start) "\"")))

However, the edits does not change the behavior of subr.el.

I worked with Eli Zaretskii on similar problem before, and here I report a more thorough analysis in the hope some experts more capable than me could help to solve this problem.

Thanks.

Da Zhang



In GNU Emacs 24.5.1 (x86_64-w64-mingw32)
 of 2015-05-16 on KAEL
Windowing system distributor `Microsoft Corp.', version 6.3.9600
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