What is rationale for GLOB_BRACE in globify() from /winsup/cygwin/dcrt0.cc??

[Oleksandr Gavenko <gavenkoa at gmail dot com>]

NOTE: all text I wrote about invoking Cygwin app from native Windows app.

Look to code:

  /* Attempt to match the argument.  Return just word (minus quoting) if no match. */
  if (glob (pattern, GLOB_TILDE | GLOB_NOCHECK | GLOB_BRACE | GLOB_QUOTE, NULL, &gl) || !gl.gl_pathc)
    return 0;

from /winsup/cygwin/dcrt0.cc.

Brace globing does not defined in POSIX (I check POSIX "2. Shell Command
Language" and glob() page.

It is available in bash by default (set -B). But does not work in ash...

Previously I have issue with striping of '{}' from arguments when used in
native Emacs:

  http://thread.gmane.org/gmane.emacs.help/73810

Every Emacs release I patch /emacs/lisp/vc/vc-hg.el because of arguments:

  ... "--template" "{rev}" ...

by quoting {rev} in single quotes. I can not use CYGWIN=noglob because in that
case I get another issue (CYGWIN=noglob remove double quotes from args):

  http://thread.gmane.org/gmane.os.cygwin/122538

Another people also have trouble with this behavior (Disable Cygwin dll
autoglobbing when git is not run via shell):

  https://github.com/magit/magit/commit/54d42d87b5b3fd756bc6d1afe30a87a684a35f37

for package: http://www.emacswiki.org/emacs/Magit

Expanding of {} is not fully consecutive, from globexp1() code:

  /* Protect a single {}, for find(1), like csh */

I ask for making this behavior configurable, like:

 CYGWIN=glob:nobrace

Note that CYGWIN=noglob is not proper solution with native Emacs for me as:

 1) It buggy when double quotes was used.
 2) Require rewrite existing code to properly quote arguments as I like set
 shell to bash...

When I say buggy I mean next. If you compile

  http://msdn.microsoft.com/en-us/library/windows/desktop/bb776391%28v=vs.85%29.aspx

with MS visual studio and run from cmd:

  cmd> argv a\"b

you get:

  0: argv
  1: a"b

When you compile:

  for (i = 0; i < argc; i++)
    printf("%d: %s\n", argv[i]);

with Cygwin gcc you get:

  cmd> set CYGWIN=noglob
  cmd> cygargv a\"b
  0: cygargv
  1: a\b

When I commit from cmd (usually this is FAR file manager) with CYGWIN=noglob
all quotes striped from my commit messages... ((


I would like to hear any comments...

-- 
Best regards!


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