/****************************************************************************
 *
 * MODULE:       g.dirseps
 * AUTHOR(S):    Paul Kelly
 * PURPOSE:      Copies input string to stdout, changing directory separator
 *               characters as specified by flags.
 *               Used for interoperability between Unix and Windows
 *               pathnames.
 * COPYRIGHT:    (C) 2006 by the GRASS Development Team
 *
 *               This program is free software under the GNU General Public
 *               License (>=v2). Read the file COPYING that comes with GRASS
 *               for details.
 *
 *****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/glocale.h>

int main(int argc, char *argv[])
{
    struct Flag *tohost, *tograss;
    struct Option *path;
    struct GModule *module;

    G_set_program_name(argv[0]);
    G_no_gisinit();

    module = G_define_module();
    module->keywords = "general";
    module->label =
	_("Internal GRASS utility for converting directory separator characters.");
    module->description = 
     "Converts any directory separator characters in "
     "the input string to or from native host format, and writes the changed "
     "path to standard output. Useful in scripts for Windows compatibility.";
   
    tohost = G_define_flag();
    tohost->key = 'h';
    tohost->description = 
     "Convert directory separators to native host format";

    tograss = G_define_flag();
    tograss->key = 'g';
    tograss->description = 
     "Convert directory separators to GRASS internal format";

    path = G_define_option();
    path->key = "path";
    path->type = TYPE_STRING;
    path->required = NO;
    path->description = "Path to be converted (read from stdin if not specified)";
   
    if (G_parser(argc, argv))
	exit(EXIT_FAILURE);

    if ( ! tohost->answer && ! tograss->answer )
        G_fatal_error("One of flags -%c or -%c must be specified!",
		      tohost->key, tograss->key);
   
    if ( tohost->answer && tograss->answer )
        G_fatal_error("Only one of flags -%c or -%c can be specified!",
		      tohost->key, tograss->key);

    if (path->answer)
    {
        /* Take input from command-line option */
        char *pathstring = G_store( path->answer );
       
        if (tohost->answer)
	    G_convert_dirseps_to_host( pathstring ); 	
       
        if (tograss->answer)
	    G_convert_dirseps_from_host( pathstring );
       
        puts( pathstring );
       
    }
    else
    {
        char inchar;
       
        while( (inchar = getc(stdin)) != EOF )
        {
            /* Read a character at a time from stdin until EOF
             * and copy to stdout after any conversion */
            if (tohost->answer)
	    {
	        if (inchar == GRASS_DIRSEP)
                    inchar = HOST_DIRSEP;
	    }
       
            if (tograss->answer)
	    {
	        if (inchar == HOST_DIRSEP)
                    inchar = GRASS_DIRSEP;
	    }
        
            putchar( inchar );
       
        }
    }   

    fflush(stdout);

    exit(EXIT_SUCCESS);

}
