#include <stdlib.h>
#include <assert.h>

#include "private.h"

/*----------------------------------------------------------- */
bool_t clish_shell_push_file(clish_shell_t * this, const char * fname,
	bool_t stop_on_error)
{
	FILE *file;
	bool_t res;

	assert(this);
	if (!fname)
		return BOOL_FALSE;
	file = fopen(fname, "r");
	if (!file)
		return BOOL_FALSE;
	res = clish_shell_push_fd(this, file, stop_on_error);
	if (!res)
		fclose(file);

	return res;
}

/*----------------------------------------------------------- */
bool_t clish_shell_push_fd(clish_shell_t * this, FILE * file,
	bool_t stop_on_error)
{
	assert(this);

	/* allocate a control node */
	clish_shell_file_t *node = malloc(sizeof(clish_shell_file_t));
	bool_t result = BOOL_TRUE;

	if (node) {
		/* intialise the node */
		node->file = file;
		node->stop_on_error = stop_on_error;
		node->next = this->current_file;

		/* put the node at the top of the file stack */
		this->current_file = node;

		/* now switch the terminal's input stream */
		tinyrl__set_istream(this->tinyrl, file);

		result = BOOL_TRUE;
	}
	return result;
}

/*----------------------------------------------------------- */
bool_t clish_shell_pop_file(clish_shell_t * this)
{
	bool_t result = BOOL_FALSE;
	clish_shell_file_t *node = this->current_file;

	if (node) {
		/* remove the current file from the stack... */
		this->current_file = node->next;

		/* and close the current file...
		 */
		fclose(node->file);

		if (node->next) {
			/* now switch the terminal's input stream */
			tinyrl__set_istream(this->tinyrl, node->next->file);
			result = BOOL_TRUE;
		}
		/* and free up the memory */
		free(node);
	}
	return result;
}

/*----------------------------------------------------------- */