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From:	Achim Gratz <Stromeko AT nexgo DOT de>
To:	cygwin AT cygwin DOT com
Subject:	Re: latest cygwin: 'run' problem
References:	<54060378 DOT 2070108 AT gmail DOT com> <5406680D DOT 4030105 AT verizon DOT net> <540761FA DOT 1040902 AT verizon DOT net> <87ppfcqyc7 DOT fsf AT Rainer DOT invalid> <540A600A DOT 6090201 AT verizon DOT net> <540A6817 DOT 9080207 AT verizon DOT net> <20140906201229 DOT GA9220 AT phoenix> <20140908174606 DOT GA4187 AT phoenix> <1448944831 DOT 20140909024857 AT yandex DOT ru> <20140909011413 DOT GC4187 AT phoenix> <20140909030238 DOT GD4187 AT phoenix>
Date:	Tue, 09 Sep 2014 11:15:03 +0200
In-Reply-To:	<20140909030238.GD4187@phoenix> (Gary Johnson's message of "Mon, 8 Sep 2014 20:02:38 -0700")
Message-ID:	<87oaup6tpk.fsf@Rainer.invalid>
User-Agent:	Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux)
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Gary Johnson writes:
> After much fiddling (programming by successive approximation),

You should drop the cargo-cult programming before it hurts you.

> I came up with this:
>
>     @START "" "C:\cygwin\bin\mintty.exe" /bin/bash --login -c "cd $(cygpath -u $0); exec bash -i" "%~p1\"

You want at least %~dp1 there (in an CMD window, type HELP CALL).  But
you can start mintty directly from the shortcut without any intervention
of START or run and you don't need a batch file or shell script either.
Things get a lot simpler if you cut out the intermediaries, although you
still need to be careful.  If you go through CMD or a shell script,
there are more levels of quoting involved and more processes to start.
Doing this through both a CMD and a shell script is seriously
overcomplicated and keeping track of what needs to go where is much more
difficult to figure out, so just don't do it.


> Using an explicit path to mintty lets me put the script itself
> someplace other than /bin.
>
> Because %~p1 ends with a backslash, I had to add another backslash
> before the closing quote to prevent the quote from being included in
> the path.  (See http://ss64.com/nt/syntax-args.html and
> http://ss64.com/nt/syntax-esc.html#escape.)
>
> I haven't tried it yet with a path that includes a space.  Tomorrow.

It won't work because you did not quote the result from cygpath.


If you want to get this right, you should work it out from the inside.
You want the cd command to get a directory name from a subcommand that
may contain spaces, so you need to quote the result:

cd "$( ... )"

Since the argument you're getting may actually be a filename, you need
to use the dirname command and quote its argument again:

cd "$(/bin/dirname "$(...)")"

and dirname gets its argument from cygpath, and the argument to cygpath
must itself be quoted again:

cd "$("$(/bin/dirname "$(/bin/cygpath -u "$1")")")"

If that suceeds you want to replace the current interpreter with an
interactive bash:

cd "$("$(/bin/dirname "$(/bin/cygpath -u "$1")")")" && exec /bin/bash -i

That is in entirety the command that you need to give to the "-c" option
of the outer bash invocation as a single argument.  The remaining
arguments are filled in from $0 and since I specified $1 to cygpath,
there's a dummy parameter to be placed, let's call it "BashHere".  So
that outer bash needs to get started like this:

/bin/bash -lc cmd_argument BashHere dir_argument

Since you're actually starting it from a shortcut, you need to keep in
mind that the quoting rules for the shortcut target are those of the MS
CRT, which means you need to wrap single arguments containing whitespace
in double quotes and then backslash escape any double quotes (and
backslashes, of which we don't have any) inside those arguments.  This
will then be put into argv from mintty, which will exec bash with those
arguments it didn't consume itself, which means there needs to be no
extra level of quoting.  So that shortcut target becomes (undo the
linewrap):

C:\Freeware\Cygwin\bin\mintty.exe -e
 "cd \"$(\"$(/bin/dirname \"$(/bin/cygpath -u \"$1\")\")\")\"
 && exec /bin/bash -i" BashHere

The dir_argument gets filled in as the last argument by the drag&drop or
SendTo operation.



Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

Factory and User Sound Singles for Waldorf Blofeld:
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