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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <unistd.h>
#include <termios.h>
#include "io.h"
#include "cmumble.h"
/* Readline has no user_data in callbacks,
* so set global_rl_user_data before dispatching
* (and unset afterwards - so we can assert user_data,
* and find where callbacks are called, that we didnt
* expect)
*/
static gpointer global_rl_user_data = NULL;
static gboolean
stdin_callback(GIOChannel *source, GIOCondition condition, gpointer data)
{
struct cmumble *cm = data;
if (condition & G_IO_IN) {
global_rl_user_data = cm;
rl_callback_read_char();
global_rl_user_data = NULL;
}
return TRUE;
}
static void
print_preserve_prompt(const gchar *string)
{
int point;
char *line;
/* FIXME */
gboolean preserve = RL_ISSTATE(RL_STATE_TERMPREPPED);
//preserve = 1;
if (preserve) {
point = rl_point;
line = rl_copy_text(0, rl_end);
rl_save_prompt();
rl_replace_line("", 0);
rl_redisplay();
}
fputs(string, stdout);
if (preserve) {
rl_restore_prompt();
rl_replace_line(line, 0);
rl_point = point;
rl_redisplay();
free(line);
}
}
static char *
skip_whitespace(char *text)
{
int i;
for (i = 0; text[i] != '\0'; ++i) {
if (text[i] != ' ')
return &text[i];
}
return &text[i];
}
static gboolean
is_escaped(char *text, int index, char escape)
{
if (index <= 0)
return FALSE;
if (text[index-1] == escape)
return !is_escaped(text, index-1, escape);
return FALSE;
}
static char *
skip_non_whitespace(char *text, char delimiter)
{
int i;
for (i = 0; text[i] != '\0'; ++i) {
if (text[i] == delimiter && !is_escaped(text, i, '\\'))
return &text[i];
}
return &text[i];
}
static char *
skip_delimiter(char *text, char *delimiter)
{
*delimiter = ' ';
if (text[0] == '"' || text[0] == '\'') {
*delimiter = text[0];
text = &text[1];
}
return text;
}
static int
command_split(char *cmd, char ***argv)
{
static char *av[16];
int i;
char delimiter;
for (i = 0; i < 15; ++i) {
cmd = skip_whitespace(cmd);
if (strlen(cmd) == 0)
break;
cmd = skip_delimiter(cmd, &delimiter);
av[i] = cmd;
cmd = skip_non_whitespace(cmd, delimiter);
if (cmd[0] == '\0') {
++i;
break;
} else {
cmd[0] = '\0';
cmd++;
}
}
av[i] = NULL;
*argv = av;
return i;
}
static void
process_line(char *line)
{
struct cmumble *cm = global_rl_user_data;
int i;
int argc;
char **argv;
const char *cmd;
g_assert(global_rl_user_data);
rl_reset_line_state();
if (line == NULL) {
printf("quit");
rl_already_prompted = 1;
rl_crlf();
g_main_loop_quit(cm->loop);
return;
}
line = g_strdup(line);
if (strlen(line))
add_history(line);
argc = command_split(line, &argv);
if (argc == 0)
goto out;
cmd = cmumble_command_expand_shortcut(argv[0]);
for (i = 0; cm->commands[i].name; ++i) {
if (strlen(cmd) == strlen(cm->commands[i].name) &&
strcmp(cmd, cm->commands[i].name) == 0) {
cm->commands[i].callback(cm, argc, argv);
break;
}
}
if (cm->commands[i].name == NULL)
g_print("Unknown command: %s\n", line);
out:
g_free(line);
}
int
cmumble_io_init(struct cmumble *cm)
{
struct termios term;
cm->io.input_channel = g_io_channel_unix_new(STDIN_FILENO);
g_io_add_watch(cm->io.input_channel, G_IO_IN | G_IO_HUP,
stdin_callback, cm);
if (tcgetattr(STDIN_FILENO, &term) < 0) {
g_printerr("tcgetattr failed");
return -1;
}
/* TODO: Maybe add comments why tcsetattr is needed?
(as in readline/examples/excallback.c)
Rename io.term to io.term_backup? */
cm->io.term = term;
term.c_lflag &= ~ICANON;
term.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSANOW, &term) < 0) {
g_printerr("tcsetattr failed");
return -1;
}
rl_callback_handler_install("cmumble> ", process_line);
g_set_print_handler(print_preserve_prompt);
return 0;
}
int
cmumble_io_fini(struct cmumble *cm)
{
rl_callback_handler_remove();
g_io_channel_unref(cm->io.input_channel);
if (tcsetattr(STDIN_FILENO, TCSANOW, &cm->io.term) < 0) {
g_printerr("tcsetattr failed");
return -1;
}
return 0;
}
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