/*
 *	aegis - project change supervisor
 *	Copyright (C) 1999 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 projects
 */

#include <project.h>
#include <project_hist.h>
#include <sub.h>
#include <sub/project.h>
#include <symtab.h>
#include <trace.h>
#include <wstr.h>
#include <wstr_list.h>

typedef string_ty *(*func_ptr)_((project_ty *));

typedef struct table_ty table_ty;
struct table_ty
{
	char		*name;
	func_ptr	func;
};


static string_ty *trunk_name_get _((project_ty *));

static string_ty *
trunk_name_get(pp)
	project_ty	*pp;
{
	while (pp->parent)
		pp = pp->parent;
	return project_name_get(pp);
}


static string_ty *trunk_description_get _((project_ty *));

static string_ty *
trunk_description_get(pp)
	project_ty	*pp;
{
	while (pp->parent)
		pp = pp->parent;
	return project_description_get(pp);
}


static table_ty table[] =
{
	{ "name", project_name_get, },
	{ "description", project_description_get, },
	{ "trunk_name", trunk_name_get, },
	{ "trunk_description", trunk_description_get, },
};

static symtab_ty *stp;


static func_ptr find_func _((string_ty *));

static func_ptr
find_func(name)
	string_ty	*name;
{
	table_ty	*tp;
	string_ty	*s;
	func_ptr	result;
	sub_context_ty	*scp;

	if (!stp)
	{
		stp = symtab_alloc(SIZEOF(table));
		for (tp = table; tp < ENDOF(table); ++tp)
		{
			s = str_from_c(tp->name);
			symtab_assign(stp, s, tp->func);
			str_free(s);
		}
	}
	result = symtab_query(stp, name);
	if (!result)
	{
		s = symtab_query_fuzzy(stp, name);
		if (s)
		{
			scp = sub_context_new();
			sub_var_set_string(scp, "Name", name);
			sub_var_set_string(scp, "Guess", s);
			error_intl(scp, i18n("no \"$name\", guessing \"$guess\""));
			sub_context_delete(scp);
		}
		return 0;
	}
	return result;
}


/*
 * NAME
 *	sub_project - the project substitution
 *
 * SYNOPSIS
 *	string_ty *sub_project(wstring_list_ty *arg);
 *
 * DESCRIPTION
 *	The sub_project function implements the project substitution.
 *	The project substitution is replaced by the project name.
 *
 * ARGUMENTS
 *	arg	- list of arguments, including the function name as [0]
 *
 * RETURNS
 *	a pointer to a string in dynamic memory;
 *	or NULL on error, setting suberr appropriately.
 */

wstring_ty *
sub_project(scp, arg)
	sub_context_ty	*scp;
	wstring_list_ty	*arg;
{
	string_ty	*s;
	wstring_ty	*result;
	func_ptr	func;
	project_ty	*pp;

	trace(("sub_project()\n{\n"/*}*/));
	pp = sub_context_project_get(scp);
	if (!pp)
	{
		sub_context_error_set(scp, i18n("not valid in current context"));
		result = 0;
	}
	else if (arg->nitems == 1)
		result = str_to_wstr(project_name_get(pp));
	else if (arg->nitems == 2)
	{
		s = wstr_to_str(arg->item[1]);
		func = find_func(s);
		str_free(s);
		if (!func)
		{
			sub_context_error_set(scp, i18n("unknown substitution variant"));
			result = 0;
		}
		else
			result = str_to_wstr(func(pp));
	}
	else
	{
		sub_context_error_set(scp, i18n("requires one argument"));
		result = 0;
	}
	trace(("return %8.8lX;\n", (long)result));
	trace((/*{*/"}\n"));
	return result;
}