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From:	Oleksandr Gavenko <gavenko AT bifit DOT com DOT ua>
Subject:	How you wrote wrapper around Cygwin scripts?
Date:	Thu, 03 Jun 2010 16:09:29 +0300
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For example Mercurial VCS hg distributed as python script.

To able invoke hg from cmd.exe (I some times use Far file manager
and all time native GNU Emacs) I wrote wrapper:

   $ cat /bin/hg.bat
@echo off
python /bin/hg %*

This script work fine except case then one of argument
contain new line (line feed) char. This used by GNU Emacs
then commited changes (in term of sh script):

   $ hg ci -m 'Multy
line nsg' myfile.c

%* in bat file truncate command line arguments to first occurence of
new line, so really invoked command look like:

   cmd> hg ci -m Multy

- message truncated and file list removed (so committed all changed
file instead one specified).


I need analog of POSIX sh:

  #!/bin/sh
  prog --additional-opt "$@"

"$@" - special syntax to pass all args unchanged.


But in must be Windows solution (be Windows executable).

I see for WSH.

WBScript/JScript are runnable script like .bat, but seems unfortunelly

   Set WshShell = CreateObject("WScript.Shell")
   Set WshExec = WshShell.Exec("printarg -a d:/tmp/.log a b c")

reinvoke cmd.exe for Exec("...") call.

So I temporary use such solution
(like in Busybox script name get from argv[0]):

int main(int argc, char **argv)
{
     char cmd[MAX_STR_LEN] = "";
     char **cmdarg = malloc((argc+1) * sizeof(char *));
     char *start, *end;

     start = strrchr(*argv, '/');
     if (start)
         start++;
     else
         start = *argv;
     end = strrchr(*argv, '.');
     if (!end)
         end = *argv + strlen(*argv);
     memcpy(cmd, start, end - start);
     cmd[end - start] = '\0';
     for (int i = 0; i < argc; i++)
         cmdarg[i] = argv[i];
     cmdarg[argc] = NULL;

     return execvp(cmd, cmdarg);
}

When compile this prog with depends on cygwin1.dll, execvp first search
for scripts before appending .exe suffix. That I need! So I do

   $ gcc -o cygrun.exe cygrun.c
   $ install -m 755 cygrun /bin/hg.exe
   $ cd /hg-repo
   $ hg.exe st 'multi xxx
yyy line'

multi xxx
yyy line: No such file or directory

As we can see multiline args correctly passed to hg python script.


But I recently posted about truble in native GNU Emacs (which build
with mingw runtime) when it invoke .exe which linked with cygwin1.dll
(both CYGWIN_NT-5.1 1.7.2s(0.225/5/3) 20100318
  and CYGWIN_NT-5.1 1.5.25(0.156/4/2) 2007-12-14 as say uname -a).


When Emacs built with mingw runtime and call its
'call-process' lisp function in uses open/openp C func
(I have bad Emacs source code knowledge so can miss here).

If executable which passed to open func built with Cygwin runtime
it remove some occurences of '{' and '}' chars from executable argv.


At all it useful have ability invoke Cygwin scripts with wrapper
which correctly passed argument to script, but I don't know how make it.

Solution like <script>.bat or <script>.exe for <script> are best
as you don't need rewrite/reconfigure 3th party program.


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