602 lines
20 KiB
C
602 lines
20 KiB
C
/* $NetBSD: display.c,v 1.1.1.3 2003/07/03 14:58:57 wiz Exp $ */
|
||
|
||
/* display.c -- How to display Info windows.
|
||
Id: display.c,v 1.4 2003/05/13 16:20:44 karl Exp
|
||
|
||
Copyright (C) 1993, 1997, 2003 Free Software Foundation, Inc.
|
||
|
||
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 2, 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, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
|
||
Written by Brian Fox (bfox@ai.mit.edu). */
|
||
|
||
#include "info.h"
|
||
#include "display.h"
|
||
|
||
extern int info_any_buffered_input_p (); /* Found in session.c. */
|
||
|
||
static void free_display ();
|
||
static DISPLAY_LINE **make_display ();
|
||
|
||
/* An array of display lines which tell us what is currently visible on
|
||
the display. */
|
||
DISPLAY_LINE **the_display = (DISPLAY_LINE **)NULL;
|
||
|
||
/* Non-zero means do no output. */
|
||
int display_inhibited = 0;
|
||
|
||
/* Initialize THE_DISPLAY to WIDTH and HEIGHT, with nothing in it. */
|
||
void
|
||
display_initialize_display (width, height)
|
||
int width, height;
|
||
{
|
||
free_display (the_display);
|
||
the_display = make_display (width, height);
|
||
display_clear_display (the_display);
|
||
}
|
||
|
||
/* Clear all of the lines in DISPLAY making the screen blank. */
|
||
void
|
||
display_clear_display (display)
|
||
DISPLAY_LINE **display;
|
||
{
|
||
register int i;
|
||
register DISPLAY_LINE *display_line;
|
||
|
||
for (i = 0; (display_line = display[i]); i++)
|
||
{
|
||
display[i]->text[0] = '\0';
|
||
display[i]->textlen = 0;
|
||
display[i]->inverse = 0;
|
||
}
|
||
}
|
||
|
||
/* Non-zero if we didn't completely redisplay a window. */
|
||
int display_was_interrupted_p = 0;
|
||
|
||
/* Update the windows pointed to by WINDOW in the_display. This actually
|
||
writes the text on the screen. */
|
||
void
|
||
display_update_display (window)
|
||
WINDOW *window;
|
||
{
|
||
register WINDOW *win;
|
||
|
||
display_was_interrupted_p = 0;
|
||
|
||
/* For every window in the list, check contents against the display. */
|
||
for (win = window; win; win = win->next)
|
||
{
|
||
/* Only re-display visible windows which need updating. */
|
||
if (((win->flags & W_WindowVisible) == 0) ||
|
||
((win->flags & W_UpdateWindow) == 0) ||
|
||
(win->height == 0))
|
||
continue;
|
||
|
||
display_update_one_window (win);
|
||
if (display_was_interrupted_p)
|
||
break;
|
||
}
|
||
|
||
/* Always update the echo area. */
|
||
display_update_one_window (the_echo_area);
|
||
}
|
||
|
||
/* Display WIN on the_display. Unlike display_update_display (), this
|
||
function only does one window. */
|
||
void
|
||
display_update_one_window (win)
|
||
WINDOW *win;
|
||
{
|
||
register char *nodetext; /* Current character to display. */
|
||
register char *last_node_char; /* Position of the last character in node. */
|
||
register int i; /* General use index. */
|
||
char *printed_line; /* Buffer for a printed line. */
|
||
int pl_index = 0; /* Index into PRINTED_LINE. */
|
||
int line_index = 0; /* Number of lines done so far. */
|
||
int pl_ignore = 0; /* How many chars use zero width on screen. */
|
||
int allocated_win_width;
|
||
DISPLAY_LINE **display = the_display;
|
||
|
||
/* If display is inhibited, that counts as an interrupted display. */
|
||
if (display_inhibited)
|
||
display_was_interrupted_p = 1;
|
||
|
||
/* If the window has no height, or display is inhibited, quit now. */
|
||
if (!win->height || display_inhibited)
|
||
return;
|
||
|
||
/* If the window's first row doesn't appear in the_screen, then it
|
||
cannot be displayed. This can happen when the_echo_area is the
|
||
window to be displayed, and the screen has shrunk to less than one
|
||
line. */
|
||
if ((win->first_row < 0) || (win->first_row > the_screen->height))
|
||
return;
|
||
|
||
/* Print each line in the window into our local buffer, and then
|
||
check the contents of that buffer against the display. If they
|
||
differ, update the display. */
|
||
allocated_win_width = win->width + 1;
|
||
printed_line = (char *)xmalloc (allocated_win_width);
|
||
|
||
if (!win->node || !win->line_starts)
|
||
goto done_with_node_display;
|
||
|
||
nodetext = win->line_starts[win->pagetop];
|
||
last_node_char = win->node->contents + win->node->nodelen;
|
||
|
||
for (; nodetext < last_node_char; nodetext++)
|
||
{
|
||
char *rep = NULL, *rep_carried_over, rep_temp[2];
|
||
int replen;
|
||
|
||
if (isprint (*nodetext))
|
||
{
|
||
rep_temp[0] = *nodetext;
|
||
replen = 1;
|
||
rep_temp[1] = '\0';
|
||
rep = rep_temp;
|
||
}
|
||
else
|
||
{
|
||
if (*nodetext == '\r' || *nodetext == '\n')
|
||
{
|
||
replen = win->width - pl_index + pl_ignore;
|
||
}
|
||
else if (*nodetext == '\0'
|
||
&& (nodetext + 1) < last_node_char
|
||
&& *(nodetext + 1) == '\b')
|
||
{
|
||
/* Found new style image tag/cookie \0\b[ or \0\b]
|
||
Just skip for now. */
|
||
nodetext++;
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
rep = printed_representation (*nodetext, pl_index);
|
||
replen = strlen (rep);
|
||
}
|
||
}
|
||
|
||
/* Support ANSI escape sequences under -R. */
|
||
if (raw_escapes_p
|
||
&& *nodetext == '\033'
|
||
&& nodetext[1] == '['
|
||
&& isdigit (nodetext[2]))
|
||
{
|
||
if (nodetext[3] == 'm')
|
||
pl_ignore += 4;
|
||
else if (isdigit (nodetext[3]) && nodetext[4] == 'm')
|
||
pl_ignore += 5;
|
||
}
|
||
while (pl_index + 2 >= allocated_win_width - 1)
|
||
{
|
||
allocated_win_width *= 2;
|
||
printed_line = (char *)xrealloc (printed_line, allocated_win_width);
|
||
}
|
||
|
||
/* If this character can be printed without passing the width of
|
||
the line, then stuff it into the line. */
|
||
if (replen + pl_index < win->width + pl_ignore)
|
||
{
|
||
/* Optimize if possible. */
|
||
if (replen == 1)
|
||
{
|
||
printed_line[pl_index++] = *rep;
|
||
}
|
||
else
|
||
{
|
||
for (i = 0; i < replen; i++)
|
||
printed_line[pl_index++] = rep[i];
|
||
}
|
||
}
|
||
else
|
||
{
|
||
DISPLAY_LINE *entry;
|
||
|
||
/* If this character cannot be printed in this line, we have
|
||
found the end of this line as it would appear on the screen.
|
||
Carefully print the end of the line, and then compare. */
|
||
if (*nodetext == '\n' || *nodetext == '\r' || *nodetext == '\t')
|
||
{
|
||
printed_line[pl_index] = '\0';
|
||
rep_carried_over = (char *)NULL;
|
||
}
|
||
else
|
||
{
|
||
/* The printed representation of this character extends into
|
||
the next line. Remember the offset of the last character
|
||
printed out of REP so that we can carry the character over
|
||
to the next line. */
|
||
for (i = 0; pl_index < (win->width + pl_ignore - 1);)
|
||
printed_line[pl_index++] = rep[i++];
|
||
|
||
rep_carried_over = rep + i;
|
||
|
||
/* If printing the last character in this window couldn't
|
||
possibly cause the screen to scroll, place a backslash
|
||
in the rightmost column. */
|
||
if (1 + line_index + win->first_row < the_screen->height)
|
||
{
|
||
if (win->flags & W_NoWrap)
|
||
printed_line[pl_index++] = '$';
|
||
else
|
||
printed_line[pl_index++] = '\\';
|
||
}
|
||
printed_line[pl_index] = '\0';
|
||
}
|
||
|
||
/* We have the exact line as it should appear on the screen.
|
||
Check to see if this line matches the one already appearing
|
||
on the screen. */
|
||
entry = display[line_index + win->first_row];
|
||
|
||
/* If the screen line is inversed, then we have to clear
|
||
the line from the screen first. Why, I don't know.
|
||
(But don't do this if we have no visible entries, as can
|
||
happen if the window is shrunk very small.) */
|
||
if ((entry && entry->inverse)
|
||
/* Need to erase the line if it has escape sequences. */
|
||
|| (raw_escapes_p && strchr (entry->text, '\033') != 0))
|
||
{
|
||
terminal_goto_xy (0, line_index + win->first_row);
|
||
terminal_clear_to_eol ();
|
||
entry->inverse = 0;
|
||
entry->text[0] = '\0';
|
||
entry->textlen = 0;
|
||
}
|
||
|
||
/* Find the offset where these lines differ. */
|
||
for (i = 0; i < pl_index; i++)
|
||
if (printed_line[i] != entry->text[i])
|
||
break;
|
||
|
||
/* If the lines are not the same length, or if they differed
|
||
at all, we must do some redrawing. */
|
||
if ((i != pl_index) || (pl_index != entry->textlen))
|
||
{
|
||
/* Move to the proper point on the terminal. */
|
||
terminal_goto_xy (i, line_index + win->first_row);
|
||
|
||
/* If there is any text to print, print it. */
|
||
if (i != pl_index)
|
||
terminal_put_text (printed_line + i);
|
||
|
||
/* If the printed text didn't extend all the way to the edge
|
||
of the window, and text was appearing between here and the
|
||
edge of the window, clear from here to the end of the line. */
|
||
if ((pl_index < win->width + pl_ignore
|
||
&& pl_index < entry->textlen)
|
||
|| (entry->inverse))
|
||
terminal_clear_to_eol ();
|
||
|
||
fflush (stdout);
|
||
|
||
/* Update the display text buffer. */
|
||
if (strlen (printed_line) > screenwidth)
|
||
/* printed_line[] can include more than screenwidth
|
||
characters if we are under -R and there are escape
|
||
sequences in it. However, entry->text was
|
||
allocated (in display_initialize_display) for
|
||
screenwidth characters only. */
|
||
entry->text = xrealloc (entry->text, strlen (printed_line)+1);
|
||
strcpy (entry->text + i, printed_line + i);
|
||
entry->textlen = pl_index;
|
||
|
||
/* Lines showing node text are not in inverse. Only modelines
|
||
have that distinction. */
|
||
entry->inverse = 0;
|
||
}
|
||
|
||
/* We have done at least one line. Increment our screen line
|
||
index, and check against the bottom of the window. */
|
||
if (++line_index == win->height)
|
||
break;
|
||
|
||
/* A line has been displayed, and the screen reflects that state.
|
||
If there is typeahead pending, then let that typeahead be read
|
||
now, instead of continuing with the display. */
|
||
if (info_any_buffered_input_p ())
|
||
{
|
||
free (printed_line);
|
||
display_was_interrupted_p = 1;
|
||
return;
|
||
}
|
||
|
||
/* Reset PL_INDEX to the start of the line. */
|
||
pl_index = 0;
|
||
pl_ignore = 0; /* this is computed per line */
|
||
|
||
/* If there are characters from REP left to print, stuff them
|
||
into the buffer now. */
|
||
if (rep_carried_over)
|
||
for (; rep[pl_index]; pl_index++)
|
||
printed_line[pl_index] = rep[pl_index];
|
||
|
||
/* If this window has chosen not to wrap lines, skip to the end
|
||
of the physical line in the buffer, and start a new line here. */
|
||
if (pl_index && (win->flags & W_NoWrap))
|
||
{
|
||
char *begin;
|
||
|
||
pl_index = 0;
|
||
printed_line[0] = '\0';
|
||
|
||
begin = nodetext;
|
||
|
||
while ((nodetext < last_node_char) && (*nodetext != '\n'))
|
||
nodetext++;
|
||
}
|
||
}
|
||
}
|
||
|
||
done_with_node_display:
|
||
/* We have reached the end of the node or the end of the window. If it
|
||
is the end of the node, then clear the lines of the window from here
|
||
to the end of the window. */
|
||
for (; line_index < win->height; line_index++)
|
||
{
|
||
DISPLAY_LINE *entry = display[line_index + win->first_row];
|
||
|
||
/* If this line has text on it then make it go away. */
|
||
if (entry && entry->textlen)
|
||
{
|
||
entry->textlen = 0;
|
||
entry->text[0] = '\0';
|
||
|
||
terminal_goto_xy (0, line_index + win->first_row);
|
||
terminal_clear_to_eol ();
|
||
}
|
||
}
|
||
|
||
/* Finally, if this window has a modeline it might need to be redisplayed.
|
||
Check the window's modeline against the one in the display, and update
|
||
if necessary. */
|
||
if ((win->flags & W_InhibitMode) == 0)
|
||
{
|
||
window_make_modeline (win);
|
||
line_index = win->first_row + win->height;
|
||
|
||
/* This display line must both be in inverse, and have the same
|
||
contents. */
|
||
if ((!display[line_index]->inverse) ||
|
||
(strcmp (display[line_index]->text, win->modeline) != 0))
|
||
{
|
||
terminal_goto_xy (0, line_index);
|
||
terminal_begin_inverse ();
|
||
terminal_put_text (win->modeline);
|
||
terminal_end_inverse ();
|
||
strcpy (display[line_index]->text, win->modeline);
|
||
display[line_index]->inverse = 1;
|
||
display[line_index]->textlen = strlen (win->modeline);
|
||
fflush (stdout);
|
||
}
|
||
}
|
||
|
||
/* Okay, this window doesn't need updating anymore. */
|
||
win->flags &= ~W_UpdateWindow;
|
||
free (printed_line);
|
||
fflush (stdout);
|
||
}
|
||
|
||
/* Scroll the region of the_display starting at START, ending at END, and
|
||
moving the lines AMOUNT lines. If AMOUNT is less than zero, the lines
|
||
are moved up in the screen, otherwise down. Actually, it is possible
|
||
for no scrolling to take place in the case that the terminal doesn't
|
||
support it. This doesn't matter to us. */
|
||
void
|
||
display_scroll_display (start, end, amount)
|
||
int start, end, amount;
|
||
{
|
||
register int i, last;
|
||
DISPLAY_LINE *temp;
|
||
|
||
/* If this terminal cannot do scrolling, give up now. */
|
||
if (!terminal_can_scroll)
|
||
return;
|
||
|
||
/* If there isn't anything displayed on the screen because it is too
|
||
small, quit now. */
|
||
if (!the_display[0])
|
||
return;
|
||
|
||
/* If there is typeahead pending, then don't actually do any scrolling. */
|
||
if (info_any_buffered_input_p ())
|
||
return;
|
||
|
||
/* Do it on the screen. */
|
||
terminal_scroll_terminal (start, end, amount);
|
||
|
||
/* Now do it in the display buffer so our contents match the screen. */
|
||
if (amount > 0)
|
||
{
|
||
last = end + amount;
|
||
|
||
/* Shift the lines to scroll right into place. */
|
||
for (i = 0; i < (end - start); i++)
|
||
{
|
||
temp = the_display[last - i];
|
||
the_display[last - i] = the_display[end - i];
|
||
the_display[end - i] = temp;
|
||
}
|
||
|
||
/* The lines have been shifted down in the buffer. Clear all of the
|
||
lines that were vacated. */
|
||
for (i = start; i != (start + amount); i++)
|
||
{
|
||
the_display[i]->text[0] = '\0';
|
||
the_display[i]->textlen = 0;
|
||
the_display[i]->inverse = 0;
|
||
}
|
||
}
|
||
|
||
if (amount < 0)
|
||
{
|
||
last = start + amount;
|
||
for (i = 0; i < (end - start); i++)
|
||
{
|
||
temp = the_display[last + i];
|
||
the_display[last + i] = the_display[start + i];
|
||
the_display[start + i] = temp;
|
||
}
|
||
|
||
/* The lines have been shifted up in the buffer. Clear all of the
|
||
lines that are left over. */
|
||
for (i = end + amount; i != end; i++)
|
||
{
|
||
the_display[i]->text[0] = '\0';
|
||
the_display[i]->textlen = 0;
|
||
the_display[i]->inverse = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Try to scroll lines in WINDOW. OLD_PAGETOP is the pagetop of WINDOW before
|
||
having had its line starts recalculated. OLD_STARTS is the list of line
|
||
starts that used to appear in this window. OLD_COUNT is the number of lines
|
||
that appear in the OLD_STARTS array. */
|
||
void
|
||
display_scroll_line_starts (window, old_pagetop, old_starts, old_count)
|
||
WINDOW *window;
|
||
int old_pagetop, old_count;
|
||
char **old_starts;
|
||
{
|
||
register int i, old, new; /* Indices into the line starts arrays. */
|
||
int last_new, last_old; /* Index of the last visible line. */
|
||
int old_first, new_first; /* Index of the first changed line. */
|
||
int unchanged_at_top = 0;
|
||
int already_scrolled = 0;
|
||
|
||
/* Locate the first line which was displayed on the old window. */
|
||
old_first = old_pagetop;
|
||
new_first = window->pagetop;
|
||
|
||
/* Find the last line currently visible in this window. */
|
||
last_new = window->pagetop + (window->height - 1);
|
||
if (last_new > window->line_count)
|
||
last_new = window->line_count - 1;
|
||
|
||
/* Find the last line which used to be currently visible in this window. */
|
||
last_old = old_pagetop + (window->height - 1);
|
||
if (last_old > old_count)
|
||
last_old = old_count - 1;
|
||
|
||
for (old = old_first, new = new_first;
|
||
old < last_old && new < last_new;
|
||
old++, new++)
|
||
if (old_starts[old] != window->line_starts[new])
|
||
break;
|
||
else
|
||
unchanged_at_top++;
|
||
|
||
/* Loop through the old lines looking for a match in the new lines. */
|
||
for (old = old_first + unchanged_at_top; old < last_old; old++)
|
||
{
|
||
for (new = new_first; new < last_new; new++)
|
||
if (old_starts[old] == window->line_starts[new])
|
||
{
|
||
/* Find the extent of the matching lines. */
|
||
for (i = 0; (old + i) < last_old; i++)
|
||
if (old_starts[old + i] != window->line_starts[new + i])
|
||
break;
|
||
|
||
/* Scroll these lines if there are enough of them. */
|
||
{
|
||
int start, end, amount;
|
||
|
||
start = (window->first_row
|
||
+ ((old + already_scrolled) - old_pagetop));
|
||
amount = new - (old + already_scrolled);
|
||
end = window->first_row + window->height;
|
||
|
||
/* If we are shifting the block of lines down, then the last
|
||
AMOUNT lines will become invisible. Thus, don't bother
|
||
scrolling them. */
|
||
if (amount > 0)
|
||
end -= amount;
|
||
|
||
if ((end - start) > 0)
|
||
{
|
||
display_scroll_display (start, end, amount);
|
||
|
||
/* Some lines have been scrolled. Simulate the scrolling
|
||
by offsetting the value of the old index. */
|
||
old += i;
|
||
already_scrolled += amount;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Move the screen cursor to directly over the current character in WINDOW. */
|
||
void
|
||
display_cursor_at_point (window)
|
||
WINDOW *window;
|
||
{
|
||
int vpos, hpos;
|
||
|
||
vpos = window_line_of_point (window) - window->pagetop + window->first_row;
|
||
hpos = window_get_cursor_column (window);
|
||
terminal_goto_xy (hpos, vpos);
|
||
fflush (stdout);
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Functions Static to this File */
|
||
/* */
|
||
/* **************************************************************** */
|
||
|
||
/* Make a DISPLAY_LINE ** with width and height. */
|
||
static DISPLAY_LINE **
|
||
make_display (width, height)
|
||
int width, height;
|
||
{
|
||
register int i;
|
||
DISPLAY_LINE **display;
|
||
|
||
display = (DISPLAY_LINE **)xmalloc ((1 + height) * sizeof (DISPLAY_LINE *));
|
||
|
||
for (i = 0; i < height; i++)
|
||
{
|
||
display[i] = (DISPLAY_LINE *)xmalloc (sizeof (DISPLAY_LINE));
|
||
display[i]->text = (char *)xmalloc (1 + width);
|
||
display[i]->textlen = 0;
|
||
display[i]->inverse = 0;
|
||
}
|
||
display[i] = (DISPLAY_LINE *)NULL;
|
||
return (display);
|
||
}
|
||
|
||
/* Free the storage allocated to DISPLAY. */
|
||
static void
|
||
free_display (display)
|
||
DISPLAY_LINE **display;
|
||
{
|
||
register int i;
|
||
register DISPLAY_LINE *display_line;
|
||
|
||
if (!display)
|
||
return;
|
||
|
||
for (i = 0; (display_line = display[i]); i++)
|
||
{
|
||
free (display_line->text);
|
||
free (display_line);
|
||
}
|
||
free (display);
|
||
}
|