X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=gui.c;h=65b2ac05d748ab1bb7d24e3b752d906d2ffca5c5;hp=5b44819c05afc074fadca3a5a7d5c1ece9fe8b8f;hb=869f0e06ec4e15abc9230c1b2d7615da5250802e;hpb=684ea7f70948c9ce5077a8a6460946ff86fefe46

diff --git a/gui.c b/gui.c
index 5b44819c..65b2ac05 100644
--- a/gui.c
+++ b/gui.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1998-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 1998-2012 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -9,7 +9,6 @@
 #include <regex.h>
 #include <signal.h>
 #include <sys/types.h>
-#include <dirent.h>
 #include <curses.h>
 
 #include "gui.cmdline.h"
@@ -22,6 +21,7 @@
 #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 +33,10 @@ 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
@@ -53,8 +53,8 @@ static unsigned scroll_position;
 static int cmd_died, curses_active;
 static pid_t cmd_pid;
 
-static int command_pipe = -1;
-static int audiod_pipe = -1;
+static int command_fds[2];
+static int stat_pipe = -1;
 static struct gui_args_info conf;
 
 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
@@ -99,7 +99,7 @@ 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 +109,8 @@ 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[] = {
 	{
@@ -186,25 +188,21 @@ 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
 	}
 };
 
-static int para_open_audiod_pipe(char *cmd)
-{
-	int fds[3] = {0, 1, 0};
-	pid_t pid;
-	int ret = para_exec_cmdline_pid(&pid, cmd, fds);
-	if (ret < 0)
-		return ret;
-	ret = mark_fd_nonblocking(fds[1]);
-	if (ret > 0)
-		return fds[1];
-	close(fds[1]);
-	return ret;
-}
-
 static int find_cmd_byname(char *name)
 {
 	int i;
@@ -244,6 +242,14 @@ 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;
@@ -308,9 +314,9 @@ 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) {
@@ -330,11 +336,14 @@ 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);
@@ -394,11 +403,13 @@ 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);
@@ -463,28 +474,33 @@ 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;
@@ -497,11 +513,14 @@ __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)
 {
@@ -649,14 +668,6 @@ 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
  */
@@ -708,12 +719,15 @@ print:
 	return 1;
 }
 
-static int read_audiod_pipe(int fd)
+static int read_stat_pipe(fd_set *rfds)
 {
 	static char *buf;
 	static int bufsize, loaded;
-	int ret;
+	int ret, ret2;
+	size_t sz;
 
+	if (stat_pipe < 0)
+		return 0;
 	if (loaded >= bufsize) {
 		if (bufsize > 1000 * 1000) {
 			loaded = 0;
@@ -723,14 +737,18 @@ static int read_audiod_pipe(int fd)
 		buf = para_realloc(buf, bufsize);
 	}
 	assert(loaded < bufsize);
-	ret = read(fd, buf + loaded, bufsize - loaded);
-	if (ret <= 0)
-		return ret;
-	loaded += ret;
-	ret = for_each_stat_item(buf, loaded, update_item);
-	if (ret < 0)
-		return ret;
-	loaded = ret;
+	ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
+		rfds, &sz);
+	loaded += sz;
+	ret2 = for_each_stat_item(buf, loaded, update_item);
+	if (ret < 0 || ret2 < 0) {
+		loaded = 0;
+		return ret2 < 0? ret2 : ret;
+	}
+	sz = ret2; /* what is left */
+	if (sz > 0 && sz < loaded)
+		memmove(buf, buf + loaded - sz, sz);
+	loaded = sz;
 	return 1;
 }
 
@@ -754,53 +772,60 @@ 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;
@@ -900,26 +925,42 @@ static void handle_signal(int sig)
 	}
 }
 
-static int open_audiod_pipe(void)
+static int open_stat_pipe(void)
 {
 	static int init = 1;
+	int ret, fds[3] = {0, 1, 0};
+	pid_t pid;
 
 	if (init)
 		init = 0;
 	else
-		sleep(1);
-	return para_open_audiod_pipe(conf.stat_cmd_arg);
+		/*
+		 * 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 */
+	ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
+	if (ret < 0)
+		return ret;
+	ret = mark_fd_nonblocking(fds[1]);
+	if (ret >= 0)
+		return fds[1];
+	close(fds[1]);
+	return ret;
 }
 
+#define COMMAND_BUF_SIZE 4096
+
 /*
  * 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
@@ -928,76 +969,85 @@ static int open_audiod_pipe(void)
 static int do_select(int mode)
 {
 	fd_set rfds;
-	int ret;
-	int max_fileno, cp_numread = 1;
-	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;
-	/* audiod pipe */
-	if (audiod_pipe < 0)
-		audiod_pipe = open_audiod_pipe();
-	if (audiod_pipe >= 0)
-		para_fd_set(audiod_pipe, &rfds, &max_fileno);
+	if (stat_pipe < 0)
+		stat_pipe = open_stat_pipe();
+	if (stat_pipe >= 0)
+		para_fd_set(stat_pipe, &rfds, &max_fileno);
 	/* 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);
+	}
 	ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 	if (ret <= 0)
 		goto check_return; /* skip fd checks */
 	/* signals */
-	if (FD_ISSET(signal_pipe, &rfds)) {
-		int sig_nr = para_next_signal();
-		if (sig_nr > 0)
-			handle_signal(sig_nr);
-	}
+	ret = para_next_signal(&rfds);
+	if (ret > 0)
+		handle_signal(ret);
 	/* read command pipe if ready */
-	if (command_pipe >= 0 && mode == COMMAND_MODE &&
-			FD_ISSET(command_pipe, &rfds)) {
-		cp_numread = read(command_pipe, command_buf + cbo,
-			sizeof(command_buf) - 1 - cbo);
-		if (cp_numread >= 0)
-			cbo += cp_numread;
-		else {
-			if (cp_numread < 0)
-				PARA_ERROR_LOG("read error (%d)", cp_numread);
-			close(command_pipe);
-			command_pipe = -1;
+	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(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 (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
-		if (read_audiod_pipe(audiod_pipe) <= 0) {
-			close(audiod_pipe);
-			audiod_pipe = -1;
-			clear_all_items();
-			free(stat_content[SI_BASENAME]);
-			stat_content[SI_BASENAME] =
-				para_strdup("audiod not running!?");
-			print_all_items();
-		}
+	ret = read_stat_pipe(&rfds);
+	if (ret < 0) {
+		PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
+		close(stat_pipe);
+		stat_pipe = -1;
+		clear_all_items();
+		free(stat_content[SI_BASENAME]);
+		stat_content[SI_BASENAME] =
+			para_strdup("stat command terminated!?");
+		print_all_items();
+	}
 check_return:
 	switch (mode) {
 	case COMMAND_MODE:
-		if (cp_numread <= 0 && !cbo) /* command complete */
-			return 0;
-		if (cbo)
-			cbo = for_each_line(command_buf, cbo,
-				&add_output_line, NULL);
-		if (cp_numread <= 0)
-			cbo = 0;
-		wrefresh(bot.win);
 		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);
@@ -1021,28 +1071,31 @@ 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);
@@ -1050,41 +1103,43 @@ 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);
+	if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
+		return;
 	cmd_died = 0;
 	do_select(EXTERNAL_MODE);
 	init_curses();
-	return 0;
 }
 
 static void print_scroll_msg(void)
@@ -1095,6 +1150,41 @@ 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;
@@ -1226,7 +1316,8 @@ static void com_reread_conf(void)
 		.override = 1,
 		.initialize = 1,
 		.check_required = 0,
-		.check_ambiguity = 0
+		.check_ambiguity = 0,
+		.print_errors = 0,
 	};
 
 	if (!cf) {
@@ -1234,8 +1325,11 @@ 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);
@@ -1348,31 +1442,30 @@ static void handle_command(int c)
 
 	/* first check user's key bindings */
 	for (i = 0; i < conf.key_map_given; ++i) {
-		char tmp[MAXLINE], *handler, *arg;
+		char *tmp, *handler, *arg;
 
-		strcpy(tmp, conf.key_map_arg[i]);
-		if (!split_key_map(tmp, &handler, &arg))
+		tmp = para_strdup(conf.key_map_arg[i]);
+		if (!split_key_map(tmp, &handler, &arg)) {
+			free(tmp);
 			return;
-		if (!strcmp(tmp, km_keyname(c))) {
-			if (*handler == 'd') {
-				display_cmd(arg);
-				return;
-			}
-			if (*handler == 'x') {
-				external_cmd(arg);
-				return;
-			}
-			if (*handler == 'p') {
-				client_cmd_cmdline(arg);
-				return;
-			}
-			if (*handler == 'i') {
-				int num = find_cmd_byname(arg);
-				if (num >= 0)
-					command_list[num].handler();
-				return;
-			}
 		}
+		if (strcmp(tmp, km_keyname(c))) {
+			free(tmp);
+			continue;
+		}
+		if (*handler == 'd')
+			display_cmd(arg);
+		else if (*handler == 'x')
+			external_cmd(arg);
+		else if (*handler == 'p')
+			para_cmd(arg);
+		else if (*handler == 'i') {
+			int num = find_cmd_byname(arg);
+			if (num >= 0)
+				command_list[num].handler();
+		}
+		free(tmp);
+		return;
 	}
 	/* not found, check internal key bindings */
 	for (i = 0; command_list[i].handler; i++) {
@@ -1393,17 +1486,9 @@ 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");
+	if (gui_cmdline_parser(argc, argv, &conf) != 0)
 		exit(EXIT_FAILURE);
-	}
 	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",
@@ -1415,15 +1500,19 @@ 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 */