/*
 *	aegis - project change supervisor
 *	Copyright (C) 2002, 2003 Peter Miller;
 *	All rights reserved.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate file_unions
 */

#include <ac/stddef.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <change.h>
#include <change/file.h>
#include <complete/change/file_union.h>
#include <complete/private.h>
#include <dir_stack.h>
#include <os.h>
#include <project/file.h>
#include <shell.h>
#include <str_list.h>


typedef struct complete_change_file_union_ty complete_change_file_union_ty;
struct complete_change_file_union_ty
{
    complete_ty     inherited;
    change_ty       *cp;
    int             baserel;
    int             regular_ok;
    int             special_ok;
    int             source_ok;
};


static void
destructor(complete_ty *cp)
{
    complete_change_file_union_ty *this_thing;

    this_thing = (complete_change_file_union_ty *)cp;
    change_free(this_thing->cp);
}


static void
perform(complete_ty *cp, shell_ty *sh)
{
    complete_change_file_union_ty *this_thing;
    string_ty       *prefix;
    string_ty       *prefix_dir;
    string_ty       *prefix_ent;
    size_t          j;
    string_list_ty  search_path;
    string_list_ty  names;
    string_ty       *base = 0;

    /*
     * Get the change search path.
     */
    this_thing = (complete_change_file_union_ty *)cp;
    change_search_path_get(this_thing->cp, &search_path, 1);

    if (this_thing->baserel)
	base = str_from_c("");
    else
    {
	string_ty       *cwd;
	string_ty       *tmp;

	os_become_orig();
	cwd = os_curdir();
	os_become_undo();

	for (j = 0; j < search_path.nstrings; ++j)
	{
	    tmp = os_below_dir(search_path.string[j], cwd);
	    if (tmp)
	    {
		if (tmp->str_length)
	       	{
		    base = str_format("%S/", tmp);
		    str_free(tmp);
	       	}
	       	else
		    base = tmp;
	       	break;
	    }
	}
	if (j >= search_path.nstrings)
	{
	    /*
	     * They are in a weird place, assume base relative.
	     */
	    base = str_from_c("");
	}
	str_free(cwd);
    }

    /*
     * Break the prefix into directory part and filename part.
     */
    prefix = str_catenate(base, shell_prefix_get(sh));
    prefix_dir = os_dirname_relative(prefix);
    prefix_ent = os_entryname_relative(prefix);

    /*
     * Read the directory (the stack union) for the file names.
     */
    os_become_orig();
    dir_stack_readdir(&search_path, prefix_dir, &names);
    os_become_undo();

    /*
     * Troll the names.
     */
    for (j = 0; j < names.nstrings; ++j)
    {
	string_ty       *name;
	struct stat     st;
	string_ty       *path;
	string_ty       *relfn;
	string_ty       *s;

	/*
	 * Make sure we like the name.
	 */
	name = names.string[j];
	if (!str_leading_prefix(name, prefix_ent))
	    continue;

	/*
	 * Ignore project source files
	 * and change source files.
	 */
	path = os_path_cat(prefix_dir, name);
	if (!this_thing->source_ok)
	{
	    fstate_src_ty   *src;

	    src =
                project_file_find(this_thing->cp->pp, path, view_path_extreme);
	    if (src)
	    {
		str_free(path);
		continue;
	    }
	    src = change_file_find(this_thing->cp, path);
	    if (src)
	    {
		str_free(path);
		continue;
	    }
	}

	/*
	 * Find out what it is.
	 * (Ignore if can't stat.)
	 */
	s = dir_stack_find(&search_path, 0, path, &st, 0, 1);
	if (!s)
	    continue;
	str_free(s);

	/*
	 * Remove the base portion before emitting.
	 */
	relfn =
	    str_n_from_c
	    (
		path->str_text + base->str_length,
		path->str_length - base->str_length
	    );

	/*
	 * Be selective about what we print.
	 */
	if (S_ISDIR(st.st_mode))
	{
	    /*
	     * We emit directories with and without a slash, so that Bash
	     * doesn't think we are finished, and put a space after the
	     * argument if there is only one directory in the answer.
	     */
	    shell_emit(sh, relfn);
	    s = str_format("%S/", relfn);
	    shell_emit(sh, s);
	    str_free(s);
	}
	else if (S_ISREG(st.st_mode))
	{
	    if (this_thing->regular_ok)
		shell_emit(sh, relfn);
	}
	else
	{
	    if (this_thing->special_ok)
		shell_emit(sh, relfn);
	}
	str_free(relfn);
	str_free(path);
    }
    string_list_destructor(&names);
    string_list_destructor(&search_path);
    str_free(prefix_ent);
    str_free(prefix_dir);
}


static complete_vtbl_ty vtbl =
{
    destructor,
    perform,
    sizeof(complete_change_file_union_ty),
    "change file union",
};


complete_ty *
complete_change_file_union(change_ty *cp, int baserel, int dir_only)
{
    complete_ty     *result;
    complete_change_file_union_ty *this_thing;

    result = complete_new(&vtbl);
    this_thing = (complete_change_file_union_ty *)result;
    this_thing->cp = cp;
    this_thing->baserel = !!baserel;
    this_thing->regular_ok = !dir_only;
    this_thing->special_ok = 0;
    this_thing->source_ok = 0;
    return result;
}
