X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=gui.c;h=7bb74e6f484a2ab0731f77a121b95d06af1b2c93;hp=dbe0a19ced1d1da9e2d588a2498dfc931371ee65;hb=23b121a85984baa9252f4b4c0b8c4f186e394bb7;hpb=7a1764a24f86bd33beff864b52605ae739a65ca5

diff --git a/gui.c b/gui.c
index dbe0a19c..7bb74e6f 100644
--- a/gui.c
+++ b/gui.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1998-2010 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1998-2013 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -9,8 +9,8 @@
 #include <regex.h>
 #include <signal.h>
 #include <sys/types.h>
-#include <dirent.h>
 #include <curses.h>
+#include <sys/time.h>
 
 #include "gui.cmdline.h"
 #include "para.h"
@@ -22,6 +22,7 @@
 #include "list.h"
 #include "sched.h"
 #include "signal.h"
+#include "version.h"
 
 /** define the array of error lists needed by para_gui */
 INIT_GUI_ERRLISTS;
@@ -33,10 +34,10 @@ static int signal_pipe;
 
 static struct win_data {
 	WINDOW *win;
-	NCURSES_SIZE_T begx;
-	NCURSES_SIZE_T begy;
-	NCURSES_SIZE_T cols;
-	NCURSES_SIZE_T lines;
+	size_t begx;
+	size_t begy;
+	size_t cols;
+	size_t lines;
 } top, bot, sb, in, sep;
 
 #define RINGBUFFER_SIZE 512
@@ -50,10 +51,10 @@ static struct ringbuffer *bot_win_rb;
 
 static unsigned scroll_position;
 
-static int cmd_died, curses_active;
+static int curses_active;
 static pid_t cmd_pid;
 
-static int command_pipe = -1;
+static int command_fds[2];
 static int stat_pipe = -1;
 static struct gui_args_info conf;
 
@@ -99,7 +100,7 @@ static void com_reread_conf(void);
 static void com_enlarge_top_win(void);
 static void com_shrink_top_win(void);
 static void com_version(void);
-static void com_quit(void);
+__noreturn static void com_quit(void);
 static void com_refresh(void);
 static void com_ll_incr(void);
 static void com_ll_decr(void);
@@ -109,6 +110,8 @@ static void com_scroll_up(void);
 static void com_scroll_down(void);
 static void com_page_up(void);
 static void com_page_down(void);
+static void com_cancel_scrolling(void);
+static void com_scroll_top(void);
 
 static struct gui_command command_list[] = {
 	{
@@ -186,6 +189,16 @@ static struct gui_command command_list[] = {
 		.name = "page_down",
 		.description = "scroll down one page",
 		.handler = com_page_down
+	}, {
+		.key = "<home>",
+		.name = "scroll_top",
+		.description = "scroll to top of buffer",
+		.handler = com_scroll_top
+	}, {
+		.key = "<end>",
+		.name = "cancel_scroll",
+		.description = "deactivate scroll mode",
+		.handler = com_cancel_scrolling
 	}, {
 		.handler = NULL
 	}
@@ -230,6 +243,14 @@ static char *km_keyname(int c)
 		sprintf(buf, "<ppage>");
 		return buf;
 	}
+	if (c == KEY_HOME) {
+		sprintf(buf, "<home>");
+		return buf;
+	}
+	if (c == KEY_END) {
+		sprintf(buf, "<end>");
+		return buf;
+	}
 	if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 		if (c < 0)
 			c += 256;
@@ -267,14 +288,20 @@ static char *configfile_exists(void)
 	return file_exists(tmp)? tmp: NULL;
 }
 
-/*
- * print num spaces to curses window
- */
+/* Print given number of spaces to curses window. */
 static void add_spaces(WINDOW* win, unsigned int num)
 {
-	while (num > 0) {
-		num--;
-		waddstr(win, " ");
+	char space[] = "                                ";
+	unsigned sz = sizeof(space);
+
+	while (num >= sz)  {
+		waddstr(win, space);
+		num -= sz;
+	}
+	if (num > 0) {
+		assert(num < sz);
+		space[num] = '\0';
+		waddstr(win, space);
 	}
 }
 
@@ -294,9 +321,9 @@ static int align_str(WINDOW* win, char *str, unsigned int len,
 		str[len] = '\0';
 		num = 0;
 	}
-	/* replace newlines by spaces */
+	/* replace control characters by spaces */
 	for (i = 0; i < len && str[i]; i++) {
-		if (str[i] == '\n')
+		if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 			str[i] = ' ';
 	}
 	if (align == LEFT) {
@@ -316,11 +343,14 @@ static int align_str(WINDOW* win, char *str, unsigned int len,
 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 {
 	char *msg;
+	va_list ap;
 
 	if (!curses_active)
 		return;
 	wattron(in.win, COLOR_PAIR(color));
-	PARA_VSPRINTF(fmt, msg);
+	va_start(ap, fmt);
+	xvasprintf(&msg, fmt, ap);
+	va_end(ap);
 	wmove(in.win, 0, 0);
 	align_str(in.win, msg, sb.cols, LEFT);
 	free(msg);
@@ -380,11 +410,13 @@ static int draw_top_rbe(unsigned *lines)
 	rbe = ringbuffer_get(bot_win_rb, fvr);
 	if (!rbe)
 		return -1;
-	/* first rbe might be only partially visible */
-	offset = (*lines - bot.lines) * bot.cols;
 	len = strlen(rbe->msg);
-	if (offset < 0 || len < offset)
-		return -1;
+	if (*lines > bot.lines) {
+		/* first rbe is only partially visible */
+		offset = (*lines - bot.lines) * bot.cols;
+		assert(offset <= len);
+	} else
+		offset = 0;
 	wattron(bot.win, COLOR_PAIR(rbe->color));
 	waddstr(bot.win, rbe->msg + offset);
 	*lines = NUM_LINES(len - offset);
@@ -449,28 +481,33 @@ static void rb_add_entry(int color, char *msg)
 __printf_2_3 static void outputf(int color, const char* fmt,...)
 {
 	char *msg;
+	va_list ap;
 
 	if (!curses_active)
 		return;
-	PARA_VSPRINTF(fmt, msg);
+	va_start(ap, fmt);
+	xvasprintf(&msg, fmt, ap);
+	va_end(ap);
 	rb_add_entry(color, msg);
 	wrefresh(bot.win);
 }
 
-static int add_output_line(char *line, __a_unused void *data)
+static int add_output_line(char *line, void *data)
 {
+	int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 	if (!curses_active)
 		return 1;
-	rb_add_entry(COLOR_OUTPUT, para_strdup(line));
+	rb_add_entry(color, para_strdup(line));
 	return 1;
 }
 
 static int loglevel;
 
-__printf_2_3 void para_log(int ll, const char *fmt,...)
+__printf_2_3 void curses_log(int ll, const char *fmt,...)
 {
 	int color;
 	char *msg;
+	va_list ap;
 
 	if (ll < loglevel || !curses_active)
 		return;
@@ -483,11 +520,14 @@ __printf_2_3 void para_log(int ll, const char *fmt,...)
 		default:
 			color = COLOR_ERRMSG;
 	}
-	PARA_VSPRINTF(fmt, msg);
+	va_start(ap, fmt);
+	xvasprintf(&msg, fmt, ap);
+	va_end(ap);
 	chop(msg);
 	rb_add_entry(color, msg);
 	wrefresh(bot.win);
 }
+__printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 
 static void setup_signal_handling(void)
 {
@@ -500,7 +540,8 @@ static void setup_signal_handling(void)
 	para_sigaction(SIGHUP, SIG_IGN);
 }
 
-__noreturn static void do_exit(int ret)
+/* kill every process in the process group and exit */
+__noreturn static void kill_pg_and_die(int ret)
 {
 	para_sigaction(SIGTERM, SIG_IGN);
 	kill(0, SIGTERM);
@@ -519,7 +560,7 @@ static void shutdown_curses(void)
 __noreturn static void finish(int ret)
 {
 	shutdown_curses();
-	do_exit(ret);
+	kill_pg_and_die(ret);
 }
 
 /*
@@ -534,7 +575,7 @@ __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 	va_start(argp, fmt);
 	vfprintf(outfd, fmt, argp);
 	va_end(argp);
-	do_exit(ret);
+	kill_pg_and_die(ret);
 }
 
 static void print_welcome(void)
@@ -635,14 +676,6 @@ static void init_wins(int top_lines)
 	doupdate();
 }
 
-static void check_geometry(void)
-{
-	if (LINES < theme.lines_min || COLS < theme.cols_min)
-		msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
-			" (need at least %dx%d)\n", COLS, LINES,
-			theme.cols_min, theme.lines_min);
-}
-
 /*
  * Print stat item #i to curses window
  */
@@ -747,53 +780,60 @@ static void clear_all_items(void)
 	}
 }
 
-static void init_colors(void)
+static void init_pair_or_die(short pair, short f, short b)
+{
+	if (init_pair(pair, f, b) == ERR)
+		msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
+}
+
+static void init_colors_or_die(void)
 {
 	int i;
 
 	if (!has_colors())
-		msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
-	start_color();
+		msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
+	if (start_color() == ERR)
+		msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 	FOR_EACH_STATUS_ITEM(i)
 		if (theme.data[i].len)
-			init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
-	init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
-	init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
-	init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
-	init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
-	init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
-	init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
-	init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
-	init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
-	init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
+			init_pair_or_die(i + 1, theme.data[i].fg,
+				theme.data[i].bg);
+	init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
+	init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
+	init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
+	init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
+	init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
+	init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
+	init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
+	init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
+	init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 }
 
-/*
- * (re-)initialize the curses library  FIXME: Error checking
- */
+/* (Re-)initialize the curses library. */
 static void init_curses(void)
 {
 	curses_active = 1;
-	if (top.win && refresh() == ERR) { /* refesh is really needed */
+	if (top.win && refresh() == ERR) /* refesh is really needed */
 		msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
-	}
-	check_geometry();
+	if (LINES < theme.lines_min || COLS < theme.cols_min)
+		msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
+			" (need at least %dx%d)\n", COLS, LINES,
+			theme.cols_min, theme.lines_min);
 	curs_set(0); /* make cursor invisible, ignore errors */
-//	if (noraw() == ERR);
-//		msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
-//			"raw mode\n");
-	nonl(); /* tell curses not to do NL->CR/NL on output */
-	noecho(); /* don't echo input */
-	cbreak(); /* take input chars one at a time, no wait for \n */
-	//reset_prog_mode();
-	init_colors();
-	clear();
+	nonl(); /* do not NL->CR/NL on output, always returns OK */
+	/* don't echo input */
+	if (noecho() == ERR)
+		msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
+	/* take input chars one at a time, no wait for \n */
+	if (cbreak() == ERR)
+		msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
+	init_colors_or_die();
+	clear(); /* ignore non-fatal errors */
 	init_wins(theme.top_lines_default);
 	print_all_items();
-	noecho(); /* don't echo input */
+	// noecho(); /* don't echo input */
 }
 
-
 static void check_sigchld(void)
 {
 	int ret;
@@ -802,10 +842,8 @@ reap_next_child:
 	ret = para_reap_child(&pid);
 	if (ret <= 0)
 		return;
-	if (pid == cmd_pid) {
+	if (pid == cmd_pid)
 		cmd_pid = 0;
-		cmd_died = 1;
-	}
 	goto reap_next_child;
 }
 
@@ -893,41 +931,45 @@ static void handle_signal(int sig)
 	}
 }
 
-static int open_stat_pipe(void)
+static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 {
-	static int init = 1;
+	static struct timeval next_exec, atm, diff;
 	int ret, fds[3] = {0, 1, 0};
 	pid_t pid;
 
-	if (init)
-		init = 0;
-	else
-		/*
-		 * Sleep a bit to avoid a busy loop. As the call to sleep() may
-		 * be interrupted by SIGCHLD, we simply wait until the call
-		 * succeeds.
-		 */
-		while (sleep(2))
-			; /* nothing */
+	if (stat_pipe >= 0)
+		goto success;
+	/* Avoid busy loop */
+	gettimeofday(&atm, NULL);
+	if (tv_diff(&next_exec, &atm, &diff) > 0) {
+		if (tv_diff(&diff, tv, NULL) < 0)
+			*tv = diff;
+		return;
+	}
+	next_exec.tv_sec = atm.tv_sec + 2;
 	ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 	if (ret < 0)
-		return ret;
+		return;
 	ret = mark_fd_nonblocking(fds[1]);
-	if (ret >= 0)
-		return fds[1];
-	close(fds[1]);
-	return ret;
+	if (ret < 0) {
+		close(fds[1]);
+		return;
+	}
+	stat_pipe = fds[1];
+success:
+	para_fd_set(stat_pipe, rfds, max_fileno);
 }
 
+#define COMMAND_BUF_SIZE 32768
+
 /*
  * This is the core select loop. Besides the (internal) signal
  * pipe, the following other fds are checked according to the mode:
  *
  * GETCH_MODE: check stdin, return when key is pressed
  *
- * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
- * of output has been read or when other end has closed command pipe or
- * when any key is pressed.
+ * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
+ * stdout and stderr or when any key is pressed.
  *
  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
  * is running. During that time curses is disabled.  Returns when
@@ -936,26 +978,29 @@ static int open_stat_pipe(void)
 static int do_select(int mode)
 {
 	fd_set rfds;
-	int ret;
-	int max_fileno;
-	char command_buf[4096] = "";
-	int cbo = 0; /* command buf offset */
+	int ret, i, max_fileno;
+	char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
+	int cbo[2] = {0, 0}; /* command buf offsets */
 	struct timeval tv;
+
 repeat:
 	tv.tv_sec = conf.timeout_arg  / 1000;
 	tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 //	ret = refresh_status();
 	FD_ZERO(&rfds);
 	max_fileno = 0;
-	if (stat_pipe < 0)
-		stat_pipe = open_stat_pipe();
-	if (stat_pipe >= 0)
-		para_fd_set(stat_pipe, &rfds, &max_fileno);
+	status_pre_select(&rfds, &max_fileno, &tv);
 	/* signal pipe */
 	para_fd_set(signal_pipe, &rfds, &max_fileno);
 	/* command pipe only for COMMAND_MODE */
-	if (command_pipe >= 0 && mode == COMMAND_MODE)
-		para_fd_set(command_pipe, &rfds, &max_fileno);
+	if (mode == COMMAND_MODE) {
+		if (command_fds[0] >= 0)
+			para_fd_set(command_fds[0], &rfds, &max_fileno);
+		if (command_fds[1] >= 0)
+			para_fd_set(command_fds[1], &rfds, &max_fileno);
+	}
+	if (mode == GETCH_MODE || mode == COMMAND_MODE)
+		para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
 	ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 	if (ret <= 0)
 		goto check_return; /* skip fd checks */
@@ -964,21 +1009,32 @@ repeat:
 	if (ret > 0)
 		handle_signal(ret);
 	/* read command pipe if ready */
-	if (command_pipe >= 0 && mode == COMMAND_MODE) {
-		size_t sz;
-		ret = read_nonblock(command_pipe, command_buf + cbo,
-			sizeof(command_buf) - 1 - cbo, &rfds, &sz);
-		cbo += sz;
-		sz = cbo;
-		cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
-		if (sz != cbo)
-			wrefresh(bot.win);
-		if (ret < 0) {
-			PARA_NOTICE_LOG("closing command pipe: %s",
-				para_strerror(-ret));
-			close(command_pipe);
-			command_pipe = -1;
-			return 0;
+	if (mode == COMMAND_MODE) {
+		for (i = 0; i < 2; i++) {
+			size_t sz;
+			if (command_fds[i] < 0)
+				continue;
+			ret = read_nonblock(command_fds[i],
+				command_buf[i] + cbo[i],
+				COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
+			cbo[i] += sz;
+			sz = cbo[i];
+			cbo[i] = for_each_line(0, command_buf[i], cbo[i],
+				add_output_line, &i);
+			if (sz != cbo[i])
+				wrefresh(bot.win);
+			if (ret < 0) {
+				PARA_NOTICE_LOG("closing command fd %d: %s",
+					i, para_strerror(-ret));
+				close(command_fds[i]);
+				command_fds[i] = -1;
+				if (command_fds[!i] < 0) /* both fds closed */
+					return 0;
+			}
+			if (cbo[i] == COMMAND_BUF_SIZE - 1) {
+				PARA_NOTICE_LOG("discarding overlong line");
+				cbo[i] = 0;
+			}
 		}
 	}
 	ret = read_stat_pipe(&rfds);
@@ -997,9 +1053,13 @@ check_return:
 	case COMMAND_MODE:
 		ret = wgetch(top.win);
 		if (ret != ERR && ret != KEY_RESIZE) {
-			if (command_pipe) {
-				close(command_pipe);
-				command_pipe = -1;
+			if (command_fds[0] >= 0) {
+				close(command_fds[0]);
+				command_fds[0] = -1;
+			}
+			if (command_fds[1] >= 0) {
+				close(command_fds[1]);
+				command_fds[1] = -1;
 			}
 			if (cmd_pid)
 				kill(cmd_pid, SIGTERM);
@@ -1012,10 +1072,8 @@ check_return:
 			return ret;
 		break;
 	case EXTERNAL_MODE:
-		if (cmd_died) {
-			cmd_died = 0;
+		if (cmd_pid == 0)
 			return 0;
-		}
 	}
 	goto repeat;
 }
@@ -1023,28 +1081,31 @@ check_return:
 /*
  * read from command pipe and print data to bot window
  */
-static int send_output(void)
+static void send_output(void)
 {
 	int ret;
 
-	if (command_pipe < 0)
-		return 0;
-	ret = mark_fd_nonblocking(command_pipe);
-	if (ret < 0) {
-		close(command_pipe);
-		return ret;
-	}
+	ret = mark_fd_nonblocking(command_fds[0]);
+	if (ret < 0)
+		goto fail;
+	ret = mark_fd_nonblocking(command_fds[1]);
+	if (ret < 0)
+		goto fail;
 	if (do_select(COMMAND_MODE) >= 0)
 		PARA_INFO_LOG("command complete");
 	else
 		PARA_NOTICE_LOG("command aborted");
 	print_in_bar(COLOR_MSG, " ");
-	return 1;
+	return;
+fail:
+	PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	close(command_fds[0]);
+	close(command_fds[1]);
 }
 
-static int client_cmd_cmdline(char *cmd)
+static void para_cmd(char *cmd)
 {
-	int ret, fds[3] = {0, 1, 0};
+	int ret, fds[3] = {0, 1, 1};
 	char *c = make_message(BINDIR "/para_client -- %s", cmd);
 
 	outputf(COLOR_COMMAND, "%s", c);
@@ -1052,41 +1113,42 @@ static int client_cmd_cmdline(char *cmd)
 	ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
 	free(c);
 	if (ret < 0)
-		return -1;
-	command_pipe = fds[1];
-	return send_output();
+		return;
+	command_fds[0] = fds[1];
+	command_fds[1] = fds[2];
+	send_output();
 }
 
 /*
  * exec command and print output to bot win
  */
-static int display_cmd(char *cmd)
+static void display_cmd(char *cmd)
 {
-	int fds[3] = {0, 1, 0};
+	int fds[3] = {0, 1, 1};
 
 	print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
 	outputf(COLOR_COMMAND, "%s", cmd);
 	if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
-		return -1;
-	command_pipe = fds[1];
-	return send_output();
+		return;
+	command_fds[0] = fds[1];
+	command_fds[1] = fds[2];
+	send_output();
 }
 
 /*
  * shutdown curses and stat pipe before executing external commands
  */
-static int external_cmd(char *cmd)
+static void external_cmd(char *cmd)
 {
 	int fds[3] = {-1, -1, -1};
 
 	if (cmd_pid)
-		return -1;
+		return;
 	shutdown_curses();
-	para_exec_cmdline_pid(&cmd_pid, cmd, fds);
-	cmd_died = 0;
+	if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
+		return;
 	do_select(EXTERNAL_MODE);
 	init_curses();
-	return 0;
 }
 
 static void print_scroll_msg(void)
@@ -1097,6 +1159,41 @@ static void print_scroll_msg(void)
 		filled - scroll_position, ringbuffer_filled(bot_win_rb));
 }
 
+static void com_scroll_top(void)
+{
+	int i = RINGBUFFER_SIZE - 1;
+	unsigned lines = 0;
+
+	while (i > 0 && !ringbuffer_get(bot_win_rb, i))
+		i--;
+	/* i is oldest entry */
+	for (; lines < bot.lines && i >= 0; i--) {
+		struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
+		if (!rbe)
+			break;
+		lines += NUM_LINES(strlen(rbe->msg));
+	}
+	i++;
+	if (lines > 0 && scroll_position != i) {
+		scroll_position = i;
+		redraw_bot_win();
+		print_scroll_msg();
+		return;
+	}
+	print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
+}
+
+static void com_cancel_scrolling(void)
+{
+
+	if (scroll_position == 0) {
+		print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
+		return;
+	}
+	scroll_position = 0;
+	redraw_bot_win();
+}
+
 static void com_page_down(void)
 {
 	unsigned lines = 0;
@@ -1228,7 +1325,8 @@ static void com_reread_conf(void)
 		.override = 1,
 		.initialize = 1,
 		.check_required = 0,
-		.check_ambiguity = 0
+		.check_ambiguity = 0,
+		.print_errors = 0,
 	};
 
 	if (!cf) {
@@ -1236,8 +1334,11 @@ static void com_reread_conf(void)
 		return;
 	}
 	PARA_INFO_LOG("rereading command line options and config file");
-	gui_cmdline_parser(_argc, _argv, &conf);
-	gui_cmdline_parser_config_file(cf, &conf, &params);
+	gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
+	if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
+		PARA_EMERG_LOG("errors in config file");
+		finish(EXIT_FAILURE);
+	}
 	PARA_NOTICE_LOG("config file reloaded");
 	if (check_key_map_args() < 0)
 		finish(EXIT_FAILURE);
@@ -1366,7 +1467,7 @@ static void handle_command(int c)
 		else if (*handler == 'x')
 			external_cmd(arg);
 		else if (*handler == 'p')
-			client_cmd_cmdline(arg);
+			para_cmd(arg);
 		else if (*handler == 'i') {
 			int num = find_cmd_byname(arg);
 			if (num >= 0)
@@ -1394,17 +1495,8 @@ int main(int argc, char *argv[])
 	_argc = argc;
 	_argv = argv;
 
-	if (gui_cmdline_parser(argc, argv, &conf)) {
-		fprintf(stderr, "parse error while reading command line\n");
-		exit(EXIT_FAILURE);
-	}
+	gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
 	HANDLE_VERSION_FLAG("gui", conf);
-	init_theme(0, &theme);
-	top.lines = theme.top_lines_default;
-	if (check_key_map_args() < 0) {
-		fprintf(stderr, "invalid key map\n");
-		exit(EXIT_FAILURE);
-	}
 	cf = configfile_exists();
 	if (!cf && conf.config_file_given) {
 		fprintf(stderr, "can not read config file %s\n",
@@ -1416,15 +1508,19 @@ int main(int argc, char *argv[])
 			.override = 0,
 			.initialize = 0,
 			.check_required = 0,
-			.check_ambiguity = 0
+			.check_ambiguity = 0,
+			.print_errors = 1,
 		};
-		gui_cmdline_parser_config_file(cf, &conf, &params);
+		if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
+			exit(EXIT_FAILURE);
 	}
 	loglevel = get_loglevel_by_name(conf.loglevel_arg);
 	if (check_key_map_args() < 0) {
-		fprintf(stderr, "invalid key map in config file\n");
+		fprintf(stderr, "invalid key map\n");
 		exit(EXIT_FAILURE);
 	}
+	init_theme_or_die(conf.theme_arg, &theme);
+	top.lines = theme.top_lines_default;
 	setup_signal_handling();
 	bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
 	initscr(); /* needed only once, always successful */