Re: [BUG] emacs cygwin compile.el next-error fails with Ant

Re: [BUG] emacs cygwin compile.el next-error fails with Ant

[Mark Evenson]

Following the suggestion of Joe Buehler the following scripts placed in
$HOME/bin, with ant-emacs chmod'd to execute

ant-emacs
----------------------------------------------------------------------
#!/bin/sh
ANT_ARGS="$ANT_ARGS -emacs" 
ANT_OPTS="$ANT_OPTS -Dbuild.compiler.emacs=true" 
export ANT_ARGS ANT_OPTS
ant $* 2>&1 | gawk -f $HOME/bin/transform.gawk 2>&1 | sed s/\\r//g | sed s/^gawk.*$//
----------------------------------------------------------------------

and the following gawk script 

transform.gawk
----------------------------------------------------------------------
/^[A-Z]:/ {
      command = "tr \\\\\\\\\ / | xargs cygpath "; 
      printf "%s", $1 | command;  
      close(command); 
      for (i = 2; i < NF; i++) {
        printf " %s", $i;
      };
      printf "\n";

      next;
}
{print}
----------------------------------------------------------------------

will make next-error work in compile.el with Emacs running under cygwin.
This is not perfect, as it changes the output slightly (I have a extra
newline emitted somehow), but it might help someone else.

After some investigation and further reflection, I think this can be
classified as a problem with Ant, and not with cygwin and/or Emacs as Ant
should emit "UNIX normalized" pathnames if it is running under
cygwin/Emacs.  The problem with implementing this is that Ant is merely
passing back the output from a native win32 javac which necessarily needs
the platform dependent path.separator variable.  Maybe I will have time his
weekend to look into this.

-- 
Mark Evenson <evenson@panix.com>

"A screaming comes across the sky.  It has happened before, but there is
nothing to compare to it now."

Re: [BUG] emacs cygwin compile.el next-error fails with Ant

[Joe Buehler]

Mark Evenson wrote:

> /^[A-Z]:/ {
>       command = "tr \\\\\\\\\ / | xargs cygpath "; 
>       printf "%s", $1 | command;  
>       close(command); 
>       for (i = 2; i < NF; i++) {
>         printf " %s", $i;
>       };
>       printf "\n";
> 
>       next;
> }
> {print}

I think I see now why you said that my posted command would not work.
The problem is that I have not yet fixed emacs to recognize drive letters.
The workaround is to use the /cygdrive/DRIVELETTER syntax.

So try something like this:

ant whatever 2>&1 | sed 's=\\=/=g;s=\([a-zA-Z]\):/=/cygdrive/\1/=g;s/\r//g'

This:

1. changes \ to /
2. changes X:/ to /cygdrive/X/
3. removes carriage returns

I saw you used some GNU sed feature for 3, so correct it if I got it wrong.
I don't think it's portable to other platforms so I never use it.
-- 
Joe Buehler