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/*
* repl-connection.c
*
* Copyright © 2019-2021 Thomas White <taw@bitwiz.me.uk>
*
* This file is part of Starlet.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <glib.h>
#include <gio/gio.h>
#include <gio/gunixsocketaddress.h>
#include <libintl.h>
#define _(x) gettext(x)
#include "repl-connection.h"
struct _replconnection
{
GSocketConnection *conn;
char inbuf[1024];
char input[2048];
};
static char *strip_crap(const char *line_orig)
{
size_t len;
char *line;
size_t outptr;
int i;
int escape_seq;
len = strlen(line_orig);
line = malloc(len+1);
if ( line == NULL ) return NULL;
/* Remove non-ASCII characters and ANSI escape sequences */
outptr = 0;
escape_seq = 0;
for ( i=0; i<len; i++ ) {
char ch = line_orig[i];
if ( (ch >= 0x1f ) && (ch < 0xff) && !escape_seq ) {
line[outptr++] = ch;
}
if ( ch == 0x1b ) escape_seq = 1;
if ( escape_seq && ch == 'm' ) escape_seq = 0;
}
line[outptr] = '\0';
return line;
}
static void process_line(const char *line_orig, ReplConnection *repl)
{
char *line = strip_crap(line_orig);
printf("%p: '%s'\n", repl, line);
free(line);
}
static void input_ready(GObject *source, GAsyncResult *res, gpointer vp)
{
GError *error = NULL;
ReplConnection *repl = vp;
size_t len;
int i;
char *nl_pos;
char *remaining;
len = g_input_stream_read_finish(G_INPUT_STREAM(source), res, &error);
repl->inbuf[len] = '\0';
for ( i=0; i<len; i++ ) {
if ( repl->inbuf[i] == '\0' ) {
repl->inbuf[i] = ' ';
fprintf(stderr, "Zero byte found in REPL output\n");
}
}
if ( strlen(repl->input) + len + 1 >= 2048 ) {
fprintf(stderr, "Too much input!\n");
} else {
strcat(repl->input, repl->inbuf);
}
nl_pos = strchr(repl->input, '\n');
while ( nl_pos != NULL ) {
size_t len_remaining = strlen(nl_pos);
nl_pos[0] = '\0';
process_line(repl->input, repl);
memmove(repl->input, nl_pos+1, len_remaining);
nl_pos = strchr(repl->input, '\n');
}
remaining = strip_crap(repl->input);
if ( strcmp(remaining, "scheme@(guile-user)> ") == 0 ) {
printf("Prompt!\n");
repl->input[0] = '\0';
}
free(remaining);
g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(repl->conn)),
repl->inbuf, 1023, G_PRIORITY_DEFAULT, NULL,
input_ready, repl);
}
ReplConnection *repl_connection_new(const char *socket)
{
ReplConnection *repl;
GSocketClient *client;
GSocketAddress *addr;
GError *error = NULL;
repl = malloc(sizeof(struct _replconnection));
if ( repl == NULL ) return NULL;
addr = g_unix_socket_address_new(socket);
if ( addr == NULL ) return NULL;
client = g_socket_client_new();
repl->conn = g_socket_client_connect(client, G_SOCKET_CONNECTABLE(addr),
NULL, &error);
if ( repl->conn == NULL ) {
fprintf(stderr, "Couldn't connect: %s\n", error->message);
return NULL;
}
repl->input[0] = '\0';
g_input_stream_read_async(g_io_stream_get_input_stream(G_IO_STREAM(repl->conn)),
repl->inbuf, 1023, G_PRIORITY_DEFAULT, NULL,
input_ready, repl);
return repl;
}
int repl_send(ReplConnection *repl, const char *line)
{
GError *error = NULL;
GOutputStream *out = g_io_stream_get_output_stream(G_IO_STREAM(repl->conn));
if ( g_output_stream_write(out, line, strlen(line), NULL, &error) == -1 ) {
fprintf(stderr, "Couldn't send: %s\n", error->message);
return 1;
}
if ( g_output_stream_write(out, "\n", 1, NULL, &error) == -1 ) {
fprintf(stderr, "Couldn't send newline: %s\n", error->message);
return 1;
}
return 0;
}
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