/* window.c -- windows in Info. $Id: window.c,v 1.5 2006/07/17 16:12:36 espie Exp $ Copyright (C) 1993, 1997, 1998, 2001, 2002, 2003, 2004 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 "nodes.h" #include "window.h" #include "display.h" #include "info-utils.h" #include "infomap.h" /* The window which describes the screen. */ WINDOW *the_screen = NULL; /* The window which describes the echo area. */ WINDOW *the_echo_area = NULL; /* The list of windows in Info. */ WINDOW *windows = NULL; /* Pointer to the active window in WINDOW_LIST. */ WINDOW *active_window = NULL; /* The size of the echo area in Info. It never changes, irregardless of the size of the screen. */ #define ECHO_AREA_HEIGHT 1 /* Macro returns the amount of space that the echo area truly requires relative to the entire screen. */ #define echo_area_required (1 + the_echo_area->height) /* Initalize the window system by creating THE_SCREEN and THE_ECHO_AREA. Create the first window ever. You pass the dimensions of the total screen size. */ void window_initialize_windows (int width, int height) { the_screen = xmalloc (sizeof (WINDOW)); the_echo_area = xmalloc (sizeof (WINDOW)); windows = xmalloc (sizeof (WINDOW)); active_window = windows; zero_mem (the_screen, sizeof (WINDOW)); zero_mem (the_echo_area, sizeof (WINDOW)); zero_mem (active_window, sizeof (WINDOW)); /* None of these windows has a goal column yet. */ the_echo_area->goal_column = -1; active_window->goal_column = -1; the_screen->goal_column = -1; /* The active and echo_area windows are visible. The echo_area is permanent. The screen is permanent. */ active_window->flags = W_WindowVisible; the_echo_area->flags = W_WindowIsPerm | W_InhibitMode | W_WindowVisible; the_screen->flags = W_WindowIsPerm; /* The height of the echo area never changes. It is statically set right here, and it must be at least 1 line for display. The size of the initial window cannot be the same size as the screen, since the screen includes the echo area. So, we make the height of the initial window equal to the screen's displayable region minus the height of the echo area. */ the_echo_area->height = ECHO_AREA_HEIGHT; active_window->height = the_screen->height - 1 - the_echo_area->height; window_new_screen_size (width, height); /* The echo area uses a different keymap than normal info windows. */ the_echo_area->keymap = echo_area_keymap; active_window->keymap = info_keymap; } /* Given that the size of the screen has changed to WIDTH and HEIGHT from whatever it was before (found in the_screen->height, ->width), change the size (and possibly location) of each window in the screen. If a window would become too small, call the function DELETER on it, after deleting the window from our chain of windows. If DELETER is NULL, nothing extra is done. The last window can never be deleted, but it can become invisible. */ /* If non-null, a function to call with WINDOW as argument when the function window_new_screen_size () has deleted WINDOW. */ VFunction *window_deletion_notifier = NULL; void window_new_screen_size (int width, int height) { register WINDOW *win; int delta_height, delta_each, delta_leftover; int numwins; /* If no change, do nothing. */ if (width == the_screen->width && height == the_screen->height) return; /* If the new window height is too small, make it be zero. */ if (height < (WINDOW_MIN_SIZE + the_echo_area->height)) height = 0; if (width < 0) width = 0; /* Find out how many windows will change. */ for (numwins = 0, win = windows; win; win = win->next, numwins++); /* See if some windows will need to be deleted. This is the case if the screen is getting smaller, and the available space divided by the number of windows is less than WINDOW_MIN_SIZE. In that case, delete some windows and try again until there is either enough space to divy up among the windows, or until there is only one window left. */ while ((height - echo_area_required) / numwins <= WINDOW_MIN_SIZE) { /* If only one window, make the size of it be zero, and return immediately. */ if (!windows->next) { windows->height = 0; maybe_free (windows->line_starts); windows->line_starts = NULL; windows->line_count = 0; break; } /* If we have some temporary windows, delete one of them. */ for (win = windows; win; win = win->next) if (win->flags & W_TempWindow) break; /* Otherwise, delete the first window, and try again. */ if (!win) win = windows; if (window_deletion_notifier) (*window_deletion_notifier) (win); window_delete_window (win); numwins--; } /* The screen has changed height and width. */ delta_height = height - the_screen->height; /* This is how much. */ the_screen->height = height; /* This is the new height. */ the_screen->width = width; /* This is the new width. */ /* Set the start of the echo area. */ the_echo_area->first_row = height - the_echo_area->height; the_echo_area->width = width; /* Check to see if the screen can really be changed this way. */ if ((!windows->next) && ((windows->height == 0) && (delta_height < 0))) return; /* Divide the change in height among the available windows. */ delta_each = delta_height / numwins; delta_leftover = delta_height - (delta_each * numwins); /* Change the height of each window in the chain by delta_each. Change the height of the last window in the chain by delta_each and by the leftover amount of change. Change the width of each window to be WIDTH. */ for (win = windows; win; win = win->next) { if ((win->width != width) && ((win->flags & W_InhibitMode) == 0)) { win->width = width; maybe_free (win->modeline); win->modeline = xmalloc (1 + width); } win->height += delta_each; /* If the previous height of this window was zero, it was the only window, and it was not visible. Thus we need to compensate for the echo_area. */ if (win->height == delta_each) win->height -= (1 + the_echo_area->height); /* If this is not the first window in the chain, then change the first row of it. We cannot just add delta_each to the first row, since this window's first row is the sum of the collective increases that have gone before it. So we just add one to the location of the previous window's modeline. */ if (win->prev) win->first_row = (win->prev->first_row + win->prev->height) + 1; /* The last window in the chain gets the extra space (or shrinkage). */ if (!win->next) win->height += delta_leftover; if (win->node) recalculate_line_starts (win); win->flags |= W_UpdateWindow; } /* If the screen got smaller, check over the windows just shrunk to keep them within bounds. Some of the windows may have gotten smaller than WINDOW_MIN_HEIGHT in which case some of the other windows are larger than the available display space in the screen. Because of our intial test above, we know that there is enough space for all of the windows. */ if ((delta_each < 0) && ((windows->height != 0) && windows->next)) { int avail; avail = the_screen->height - (numwins + the_echo_area->height); win = windows; while (win) { if ((win->height < WINDOW_MIN_HEIGHT) || (win->height > avail)) { WINDOW *lastwin = NULL; /* Split the space among the available windows. */ delta_each = avail / numwins; delta_leftover = avail - (delta_each * numwins); for (win = windows; win; win = win->next) { lastwin = win; if (win->prev) win->first_row = (win->prev->first_row + win->prev->height) + 1; win->height = delta_each; } /* Give the leftover space (if any) to the last window. */ lastwin->height += delta_leftover; break; } else win= win->next; } } } /* Make a new window showing NODE, and return that window structure. If NODE is passed as NULL, then show the node showing in the active window. If the window could not be made return a NULL pointer. The active window is not changed.*/ WINDOW * window_make_window (NODE *node) { WINDOW *window; if (!node) node = active_window->node; /* If there isn't enough room to make another window, return now. */ if ((active_window->height / 2) < WINDOW_MIN_SIZE) return (NULL); /* Make and initialize the new window. The fudging about with -1 and +1 is because the following window in the chain cannot start at window->height, since that is where the modeline for the previous window is displayed. The inverse adjustment is made in window_delete_window (). */ window = xmalloc (sizeof (WINDOW)); window->width = the_screen->width; window->height = (active_window->height / 2) - 1; #if defined (SPLIT_BEFORE_ACTIVE) window->first_row = active_window->first_row; #else window->first_row = active_window->first_row + (active_window->height - window->height); #endif window->keymap = info_keymap; window->goal_column = -1; window->modeline = xmalloc (1 + window->width); window->line_starts = NULL; window->flags = W_UpdateWindow | W_WindowVisible; window_set_node_of_window (window, node); /* Adjust the height of the old active window. */ active_window->height -= (window->height + 1); #if defined (SPLIT_BEFORE_ACTIVE) active_window->first_row += (window->height + 1); #endif active_window->flags |= W_UpdateWindow; /* Readjust the new and old windows so that their modelines and contents will be displayed correctly. */ #if defined (NOTDEF) /* We don't have to do this for WINDOW since window_set_node_of_window () already did. */ window_adjust_pagetop (window); window_make_modeline (window); #endif /* NOTDEF */ /* We do have to readjust the existing active window. */ window_adjust_pagetop (active_window); window_make_modeline (active_window); #if defined (SPLIT_BEFORE_ACTIVE) /* This window is just before the active one. The active window gets bumped down one. The active window is not changed. */ window->next = active_window; window->prev = active_window->prev; active_window->prev = window; if (window->prev) window->prev->next = window; else windows = window; #else /* This window is just after the active one. Which window is active is not changed. */ window->prev = active_window; window->next = active_window->next; active_window->next = window; if (window->next) window->next->prev = window; #endif /* !SPLIT_BEFORE_ACTIVE */ return (window); } /* These useful macros make it possible to read the code in window_change_window_height (). */ #define grow_me_shrinking_next(me, next, diff) \ do { \ me->height += diff; \ next->height -= diff; \ next->first_row += diff; \ window_adjust_pagetop (next); \ } while (0) #define grow_me_shrinking_prev(me, prev, diff) \ do { \ me->height += diff; \ prev->height -= diff; \ me->first_row -=diff; \ window_adjust_pagetop (prev); \ } while (0) #define shrink_me_growing_next(me, next, diff) \ do { \ me->height -= diff; \ next->height += diff; \ next->first_row -= diff; \ window_adjust_pagetop (next); \ } while (0) #define shrink_me_growing_prev(me, prev, diff) \ do { \ me->height -= diff; \ prev->height += diff; \ me->first_row += diff; \ window_adjust_pagetop (prev); \ } while (0) /* Change the height of WINDOW by AMOUNT. This also automagically adjusts the previous and next windows in the chain. If there is only one user window, then no change takes place. */ void window_change_window_height (WINDOW *window, int amount) { register WINDOW *win, *prev, *next; /* If there is only one window, or if the amount of change is zero, return immediately. */ if (!windows->next || amount == 0) return; /* Find this window in our chain. */ for (win = windows; win; win = win->next) if (win == window) break; /* If the window is isolated (i.e., doesn't appear in our window list, then quit now. */ if (!win) return; /* Change the height of this window by AMOUNT, if that is possible. It can be impossible if there isn't enough available room on the screen, or if the resultant window would be too small. */ prev = window->prev; next = window->next; /* WINDOW decreasing in size? */ if (amount < 0) { int abs_amount = -amount; /* It is easier to deal with this way. */ /* If the resultant window would be too small, stop here. */ if ((window->height - abs_amount) < WINDOW_MIN_HEIGHT) return; /* If we have two neighboring windows, choose the smaller one to get larger. */ if (next && prev) { if (prev->height < next->height) shrink_me_growing_prev (window, prev, abs_amount); else shrink_me_growing_next (window, next, abs_amount); } else if (next) shrink_me_growing_next (window, next, abs_amount); else shrink_me_growing_prev (window, prev, abs_amount); } /* WINDOW increasing in size? */ if (amount > 0) { int total_avail, next_avail = 0, prev_avail = 0; if (next) next_avail = next->height - WINDOW_MIN_SIZE; if (prev) prev_avail = prev->height - WINDOW_MIN_SIZE; total_avail = next_avail + prev_avail; /* If there isn't enough space available to grow this window, give up. */ if (amount > total_avail) return; /* If there aren't two neighboring windows, or if one of the neighbors is larger than the other one by at least AMOUNT, grow that one. */ if ((next && !prev) || ((next_avail - amount) >= prev_avail)) grow_me_shrinking_next (window, next, amount); else if ((prev && !next) || ((prev_avail - amount) >= next_avail)) grow_me_shrinking_prev (window, prev, amount); else { int change; /* This window has two neighbors. They both must be shrunk in to make enough space for WINDOW to grow. Make them both the same size. */ if (prev_avail > next_avail) { change = prev_avail - next_avail; grow_me_shrinking_prev (window, prev, change); amount -= change; } else { change = next_avail - prev_avail; grow_me_shrinking_next (window, next, change); amount -= change; } /* Both neighbors are the same size. Split the difference in AMOUNT between them. */ while (amount) { window->height++; amount--; /* Odd numbers grow next, even grow prev. */ if (amount & 1) { prev->height--; window->first_row--; } else { next->height--; next->first_row++; } } window_adjust_pagetop (prev); window_adjust_pagetop (next); } } if (prev) prev->flags |= W_UpdateWindow; if (next) next->flags |= W_UpdateWindow; window->flags |= W_UpdateWindow; window_adjust_pagetop (window); } /* Tile all of the windows currently displayed in the global variable WINDOWS. If argument STYLE is TILE_INTERNALS, tile windows displaying internal nodes as well, otherwise do not change the height of such windows. */ void window_tile_windows (int style) { WINDOW *win, *last_adjusted; int numwins, avail, per_win_height, leftover; int do_internals; numwins = avail = 0; do_internals = (style == TILE_INTERNALS); for (win = windows; win; win = win->next) if (do_internals || !win->node || (win->node->flags & N_IsInternal) == 0) { avail += win->height; numwins++; } if (numwins <= 1 || !the_screen->height) return; /* Find the size for each window. Divide the size of the usable portion of the screen by the number of windows. */ per_win_height = avail / numwins; leftover = avail - (per_win_height * numwins); last_adjusted = NULL; for (win = windows; win; win = win->next) { if (do_internals || !win->node || (win->node->flags & N_IsInternal) == 0) { last_adjusted = win; win->height = per_win_height; } } if (last_adjusted) last_adjusted->height += leftover; /* Readjust the first_row of every window in the chain. */ for (win = windows; win; win = win->next) { if (win->prev) win->first_row = win->prev->first_row + win->prev->height + 1; window_adjust_pagetop (win); win->flags |= W_UpdateWindow; } } /* Toggle the state of line wrapping in WINDOW. This can do a bit of fancy redisplay. */ void window_toggle_wrap (WINDOW *window) { if (window->flags & W_NoWrap) window->flags &= ~W_NoWrap; else window->flags |= W_NoWrap; if (window != the_echo_area) { char **old_starts; int old_lines, old_pagetop; old_starts = window->line_starts; old_lines = window->line_count; old_pagetop = window->pagetop; calculate_line_starts (window); /* Make sure that point appears within this window. */ window_adjust_pagetop (window); /* If the pagetop hasn't changed maybe we can do some scrolling now to speed up the display. Many of the line starts will be the same, so scrolling here is a very good optimization.*/ if (old_pagetop == window->pagetop) display_scroll_line_starts (window, old_pagetop, old_starts, old_lines); maybe_free (old_starts); } window->flags |= W_UpdateWindow; } /* Set WINDOW to display NODE. */ void window_set_node_of_window (WINDOW *window, NODE *node) { window->node = node; window->pagetop = 0; window->point = 0; recalculate_line_starts (window); window->flags |= W_UpdateWindow; /* The display_pos member is nonzero if we're displaying an anchor. */ window->point = node ? node->display_pos : 0; window_adjust_pagetop (window); window_make_modeline (window); } /* Delete WINDOW from the list of known windows. If this window was the active window, make the next window in the chain be the active window. If the active window is the next or previous window, choose that window as the recipient of the extra space. Otherwise, prefer the next window. */ void window_delete_window (WINDOW *window) { WINDOW *next, *prev, *window_to_fix; next = window->next; prev = window->prev; /* You cannot delete the only window or a permanent window. */ if ((!next && !prev) || (window->flags & W_WindowIsPerm)) return; if (next) next->prev = prev; if (!prev) windows = next; else prev->next = next; if (window->line_starts) free (window->line_starts); if (window->modeline) free (window->modeline); if (window == active_window) { /* If there isn't a next window, then there must be a previous one, since we cannot delete the last window. If there is a next window, prefer to use that as the active window. */ if (next) active_window = next; else active_window = prev; } if (next && active_window == next) window_to_fix = next; else if (prev && active_window == prev) window_to_fix = prev; else if (next) window_to_fix = next; else if (prev) window_to_fix = prev; else window_to_fix = windows; if (window_to_fix->first_row > window->first_row) { int diff; /* Try to adjust the visible part of the node so that as little text as possible has to move. */ diff = window_to_fix->first_row - window->first_row; window_to_fix->first_row = window->first_row; window_to_fix->pagetop -= diff; if (window_to_fix->pagetop < 0) window_to_fix->pagetop = 0; } /* The `+ 1' is to offset the difference between the first_row locations. See the code in window_make_window (). */ window_to_fix->height += window->height + 1; window_to_fix->flags |= W_UpdateWindow; free (window); } /* For every window in CHAIN, set the flags member to have FLAG set. */ void window_mark_chain (WINDOW *chain, int flag) { register WINDOW *win; for (win = chain; win; win = win->next) win->flags |= flag; } /* For every window in CHAIN, clear the flags member of FLAG. */ void window_unmark_chain (WINDOW *chain, int flag) { register WINDOW *win; for (win = chain; win; win = win->next) win->flags &= ~flag; } /* Return the number of characters it takes to display CHARACTER on the screen at HPOS. */ int character_width (int character, int hpos) { int printable_limit = 127; int width = 1; if (ISO_Latin_p) printable_limit = 255; if (character > printable_limit) width = 3; else if (iscntrl (character)) { switch (character) { case '\r': case '\n': width = the_screen->width - hpos; break; case '\t': width = ((hpos + 8) & 0xf8) - hpos; break; default: width = 2; } } else if (character == DEL) width = 2; return (width); } /* Return the number of characters it takes to display STRING on the screen at HPOS. */ int string_width (char *string, int hpos) { register int i, width, this_char_width; for (width = 0, i = 0; string[i]; i++) { /* Support ANSI escape sequences for -R. */ if (raw_escapes_p && string[i] == '\033' && string[i+1] == '[' && isdigit (string[i+2]) && (string[i+3] == 'm' || (isdigit (string[i+3]) && string[i+4] == 'm'))) { while (string[i] != 'm') i++; this_char_width = 0; } else this_char_width = character_width (string[i], hpos); width += this_char_width; hpos += this_char_width; } return (width); } /* Quickly guess the approximate number of lines that NODE would take to display. This really only counts carriage returns. */ int window_physical_lines (NODE *node) { register int i, lines; char *contents; if (!node) return (0); contents = node->contents; for (i = 0, lines = 1; i < node->nodelen; i++) if (contents[i] == '\n') lines++; return (lines); } /* Calculate a list of line starts for the node belonging to WINDOW. The line starts are pointers to the actual text within WINDOW->NODE. */ void calculate_line_starts (WINDOW *window) { register int i, hpos; char **line_starts = NULL; int line_starts_index = 0, line_starts_slots = 0; int bump_index; NODE *node; window->line_starts = NULL; window->line_count = 0; node = window->node; if (!node) return; /* Grovel the node starting at the top, and for each line calculate the width of the characters appearing in that line. Add each line start to our array. */ i = 0; hpos = 0; bump_index = 0; while (i < node->nodelen) { char *line = node->contents + i; unsigned int cwidth, c; add_pointer_to_array (line, line_starts_index, line_starts, line_starts_slots, 100, char *); if (bump_index) { i++; bump_index = 0; } while (1) { /* The cast to unsigned char is for 8-bit characters, which could be passed as negative integers to character_width and wreak havoc on some naive implementations of iscntrl. */ c = (unsigned char) node->contents[i]; /* Support ANSI escape sequences for -R. */ if (raw_escapes_p && c == '\033' && node->contents[i+1] == '[' && isdigit (node->contents[i+2])) { if (node->contents[i+3] == 'm') { i += 3; cwidth = 0; } else if (isdigit (node->contents[i+3]) && node->contents[i+4] == 'm') { i += 4; cwidth = 0; } else cwidth = character_width (c, hpos); } else cwidth = character_width (c, hpos); /* If this character fits within this line, just do the next one. */ if ((hpos + cwidth) < (unsigned int) window->width) { i++; hpos += cwidth; continue; } else { /* If this character would position the cursor at the start of the next printed screen line, then do the next line. */ if (c == '\n' || c == '\r' || c == '\t') { i++; hpos = 0; break; } else { /* This character passes the window width border. Postion the cursor after the printed character, but remember this line start as where this character is. A bit tricky. */ /* If this window doesn't wrap lines, proceed to the next physical line here. */ if (window->flags & W_NoWrap) { hpos = 0; while (i < node->nodelen && node->contents[i] != '\n') i++; if (node->contents[i] == '\n') i++; } else { hpos = the_screen->width - hpos; bump_index++; } break; } } } } window->line_starts = line_starts; window->line_count = line_starts_index; } /* Given WINDOW, recalculate the line starts for the node it displays. */ void recalculate_line_starts (WINDOW *window) { maybe_free (window->line_starts); calculate_line_starts (window); } /* Global variable control redisplay of scrolled windows. If non-zero, it is the desired number of lines to scroll the window in order to make point visible. A user might set this to 1 for smooth scrolling. If set to zero, the line containing point is centered within the window. */ int window_scroll_step = 0; /* Adjust the pagetop of WINDOW such that the cursor point will be visible. */ void window_adjust_pagetop (WINDOW *window) { register int line = 0; char *contents; if (!window->node) return; contents = window->node->contents; /* Find the first printed line start which is after WINDOW->point. */ for (line = 0; line < window->line_count; line++) { char *line_start; line_start = window->line_starts[line]; if ((line_start - contents) > window->point) break; } /* The line index preceding the line start which is past point is the one containing point. */ line--; /* If this line appears in the current displayable page, do nothing. Otherwise, adjust the top of the page to make this line visible. */ if ((line < window->pagetop) || (line - window->pagetop > (window->height - 1))) { /* The user-settable variable "scroll-step" is used to attempt to make point visible, iff it is non-zero. If that variable is zero, then the line containing point is centered within the window. */ if (window_scroll_step < window->height) { if ((line < window->pagetop) && ((window->pagetop - window_scroll_step) <= line)) window->pagetop -= window_scroll_step; else if ((line - window->pagetop > (window->height - 1)) && ((line - (window->pagetop + window_scroll_step) < window->height))) window->pagetop += window_scroll_step; else window->pagetop = line - ((window->height - 1) / 2); } else window->pagetop = line - ((window->height - 1) / 2); if (window->pagetop < 0) window->pagetop = 0; window->flags |= W_UpdateWindow; } } /* Return the index of the line containing point. */ int window_line_of_point (WINDOW *window) { register int i, start = 0; /* Try to optimize. Check to see if point is past the pagetop for this window, and if so, start searching forward from there. */ if ((window->pagetop > -1 && window->pagetop < window->line_count) && (window->line_starts[window->pagetop] - window->node->contents) <= window->point) start = window->pagetop; for (i = start; i < window->line_count; i++) { if ((window->line_starts[i] - window->node->contents) > window->point) break; } return (i - 1); } /* Get and return the goal column for this window. */ int window_get_goal_column (WINDOW *window) { if (!window->node) return (-1); if (window->goal_column != -1) return (window->goal_column); /* Okay, do the work. Find the printed offset of the cursor in this window. */ return (window_get_cursor_column (window)); } /* Get and return the printed column offset of the cursor in this window. */ int window_get_cursor_column (WINDOW *window) { int i, hpos, end; char *line; i = window_line_of_point (window); if (i < 0) return (-1); line = window->line_starts[i]; end = window->point - (line - window->node->contents); for (hpos = 0, i = 0; i < end; i++) { /* Support ANSI escape sequences for -R. */ if (raw_escapes_p && line[i] == '\033' && line[i+1] == '[' && isdigit (line[i+2])) { if (line[i+3] == 'm') i += 3; else if (isdigit (line[i+3]) && line[i+4] == 'm') i += 4; else hpos += character_width (line[i], hpos); } else hpos += character_width (line[i], hpos); } return (hpos); } /* Count the number of characters in LINE that precede the printed column offset of GOAL. */ int window_chars_to_goal (char *line, int goal) { register int i, check = 0, hpos; for (hpos = 0, i = 0; line[i] != '\n'; i++) { /* Support ANSI escape sequences for -R. */ if (raw_escapes_p && line[i] == '\033' && line[i+1] == '[' && isdigit (line[i+2]) && (line[i+3] == 'm' || (isdigit (line[i+3]) && line[i+4] == 'm'))) while (line[i] != 'm') i++; else check = hpos + character_width (line[i], hpos); if (check > goal) break; hpos = check; } return (i); } /* Create a modeline for WINDOW, and store it in window->modeline. */ void window_make_modeline (WINDOW *window) { register int i; char *modeline; char location_indicator[4]; int lines_remaining; /* Only make modelines for those windows which have one. */ if (window->flags & W_InhibitMode) return; /* Find the number of lines actually displayed in this window. */ lines_remaining = window->line_count - window->pagetop; if (window->pagetop == 0) { if (lines_remaining <= window->height) strcpy (location_indicator, "All"); else strcpy (location_indicator, "Top"); } else { if (lines_remaining <= window->height) strcpy (location_indicator, "Bot"); else { float pt, lc; int percentage; pt = (float)window->pagetop; lc = (float)window->line_count; percentage = 100 * (pt / lc); sprintf (location_indicator, "%2d%%", percentage); } } /* Calculate the maximum size of the information to stick in MODELINE. */ { int modeline_len = 0; char *parent = NULL, *filename = "*no file*"; char *nodename = "*no node*"; const char *update_message = NULL; NODE *node = window->node; if (node) { if (node->nodename) nodename = node->nodename; if (node->parent) { parent = filename_non_directory (node->parent); modeline_len += strlen ("Subfile: ") + strlen (node->filename); } if (node->filename) filename = filename_non_directory (node->filename); if (node->flags & N_UpdateTags) update_message = _("--*** Tags out of Date ***"); } if (update_message) modeline_len += strlen (update_message); modeline_len += strlen (filename); modeline_len += strlen (nodename); modeline_len += 4; /* strlen (location_indicator). */ /* 10 for the decimal representation of the number of lines in this node, and the remainder of the text that can appear in the line. */ modeline_len += 10 + strlen (_("-----Info: (), lines ----, ")); modeline_len += window->width; modeline = xmalloc (1 + modeline_len); /* Special internal windows have no filename. */ if (!parent && !*filename) sprintf (modeline, _("-%s---Info: %s, %d lines --%s--"), (window->flags & W_NoWrap) ? "$" : "-", nodename, window->line_count, location_indicator); else sprintf (modeline, _("-%s%s-Info: (%s)%s, %d lines --%s--"), (window->flags & W_NoWrap) ? "$" : "-", (node && (node->flags & N_IsCompressed)) ? "zz" : "--", parent ? parent : filename, nodename, window->line_count, location_indicator); if (parent) sprintf (modeline + strlen (modeline), _(" Subfile: %s"), filename); if (update_message) sprintf (modeline + strlen (modeline), "%s", update_message); i = strlen (modeline); if (i >= window->width) modeline[window->width] = '\0'; else { while (i < window->width) modeline[i++] = '-'; modeline[i] = '\0'; } strcpy (window->modeline, modeline); free (modeline); } } /* Make WINDOW start displaying at PERCENT percentage of its node. */ void window_goto_percentage (WINDOW *window, int percent) { int desired_line; if (!percent) desired_line = 0; else desired_line = (int) ((float)window->line_count * ((float)percent / 100.0)); window->pagetop = desired_line; window->point = window->line_starts[window->pagetop] - window->node->contents; window->flags |= W_UpdateWindow; window_make_modeline (window); } /* Get the state of WINDOW, and save it in STATE. */ void window_get_state (WINDOW *window, SEARCH_STATE *state) { state->node = window->node; state->pagetop = window->pagetop; state->point = window->point; } /* Set the node, pagetop, and point of WINDOW. */ void window_set_state (WINDOW *window, SEARCH_STATE *state) { if (window->node != state->node) window_set_node_of_window (window, state->node); window->pagetop = state->pagetop; window->point = state->point; } /* Manipulating home-made nodes. */ /* A place to buffer echo area messages. */ static NODE *echo_area_node = NULL; /* Make the node of the_echo_area be an empty one. */ static void free_echo_area (void) { if (echo_area_node) { maybe_free (echo_area_node->contents); free (echo_area_node); } echo_area_node = NULL; window_set_node_of_window (the_echo_area, echo_area_node); } /* Clear the echo area, removing any message that is already present. The echo area is cleared immediately. */ void window_clear_echo_area (void) { free_echo_area (); display_update_one_window (the_echo_area); } /* Make a message appear in the echo area, built from FORMAT, ARG1 and ARG2. The arguments are treated similar to printf () arguments, but not all of printf () hair is present. The message appears immediately. If there was already a message appearing in the echo area, it is removed. */ void window_message_in_echo_area (char *format, void *arg1, void *arg2) { free_echo_area (); echo_area_node = build_message_node (format, arg1, arg2); window_set_node_of_window (the_echo_area, echo_area_node); display_update_one_window (the_echo_area); } /* Place a temporary message in the echo area built from FORMAT, ARG1 and ARG2. The message appears immediately, but does not destroy any existing message. A future call to unmessage_in_echo_area () restores the old contents. */ static NODE **old_echo_area_nodes = NULL; static int old_echo_area_nodes_index = 0; static int old_echo_area_nodes_slots = 0; void message_in_echo_area (char *format, void *arg1, void *arg2) { if (echo_area_node) { add_pointer_to_array (echo_area_node, old_echo_area_nodes_index, old_echo_area_nodes, old_echo_area_nodes_slots, 4, NODE *); } echo_area_node = NULL; window_message_in_echo_area (format, arg1, arg2); } void unmessage_in_echo_area (void) { free_echo_area (); if (old_echo_area_nodes_index) echo_area_node = old_echo_area_nodes[--old_echo_area_nodes_index]; window_set_node_of_window (the_echo_area, echo_area_node); display_update_one_window (the_echo_area); } /* A place to build a message. */ static char *message_buffer = NULL; static int message_buffer_index = 0; static int message_buffer_size = 0; /* Ensure that there is enough space to stuff LENGTH characters into MESSAGE_BUFFER. */ static void message_buffer_resize (int length) { if (!message_buffer) { message_buffer_size = length + 1; message_buffer = xmalloc (message_buffer_size); message_buffer_index = 0; } while (message_buffer_size <= message_buffer_index + length) message_buffer = (char *) xrealloc (message_buffer, message_buffer_size += 100 + (2 * length)); } /* Format MESSAGE_BUFFER with the results of printing FORMAT with ARG1 and ARG2. */ static void build_message_buffer (char *format, void *arg1, void *arg2, void *arg3) { register int i, len; void *args[3]; int arg_index = 0; args[0] = arg1; args[1] = arg2; args[2] = arg3; len = strlen (format); message_buffer_resize (len); for (i = 0; format[i]; i++) { if (format[i] != '%') { message_buffer[message_buffer_index++] = format[i]; len--; } else { char c; char *fmt_start = format + i; char *fmt; int fmt_len, formatted_len; int paramed = 0; format_again: i++; while (format[i] && strchr ("-. +0123456789", format[i])) i++; c = format[i]; if (c == '\0') abort (); if (c == '$') { /* position parameter parameter */ /* better to use bprintf from bfox's metahtml? */ arg_index = atoi(fmt_start + 1) - 1; if (arg_index < 0) arg_index = 0; if (arg_index >= 2) arg_index = 1; paramed = 1; goto format_again; } fmt_len = format + i - fmt_start + 1; fmt = (char *) xmalloc (fmt_len + 1); strncpy (fmt, fmt_start, fmt_len); fmt[fmt_len] = '\0'; if (paramed) { /* removed positioned parameter */ char *p; for (p = fmt + 1; *p && *p != '$'; p++) { ; } strcpy(fmt + 1, p + 1); } /* If we have "%-98s", maybe 98 calls for a longer string. */ if (fmt_len > 2) { int j; for (j = fmt_len - 2; j >= 0; j--) if (isdigit (fmt[j]) || fmt[j] == '$') break; formatted_len = atoi (fmt + j); } else formatted_len = c == 's' ? 0 : 1; /* %s can produce empty string */ switch (c) { case '%': /* Insert a percent sign. */ message_buffer_resize (len + formatted_len); sprintf (message_buffer + message_buffer_index, fmt, "%"); message_buffer_index += formatted_len; break; case 's': /* Insert the current arg as a string. */ { char *string; int string_len; string = (char *)args[arg_index++]; string_len = strlen (string); if (formatted_len > string_len) string_len = formatted_len; message_buffer_resize (len + string_len); sprintf (message_buffer + message_buffer_index, fmt, string); message_buffer_index += string_len; } break; case 'd': /* Insert the current arg as an integer. */ { long long_val; int integer; long_val = (long)args[arg_index++]; integer = (int)long_val; message_buffer_resize (len + formatted_len > 32 ? formatted_len : 32); sprintf (message_buffer + message_buffer_index, fmt, integer); message_buffer_index = strlen (message_buffer); } break; case 'c': /* Insert the current arg as a character. */ { long long_val; int character; long_val = (long)args[arg_index++]; character = (int)long_val; message_buffer_resize (len + formatted_len); sprintf (message_buffer + message_buffer_index, fmt, character); message_buffer_index += formatted_len; } break; default: abort (); } free (fmt); } } message_buffer[message_buffer_index] = '\0'; } /* Build a new node which has FORMAT printed with ARG1 and ARG2 as the contents. */ NODE * build_message_node (char *format, void *arg1, void *arg2) { NODE *node; message_buffer_index = 0; build_message_buffer (format, arg1, arg2, 0); node = message_buffer_to_node (); return (node); } /* Convert the contents of the message buffer to a node. */ NODE * message_buffer_to_node (void) { NODE *node; node = xmalloc (sizeof (NODE)); node->filename = NULL; node->parent = NULL; node->nodename = NULL; node->flags = 0; node->display_pos =0; /* Make sure that this buffer ends with a newline. */ node->nodelen = 1 + strlen (message_buffer); node->contents = xmalloc (1 + node->nodelen); strcpy (node->contents, message_buffer); node->contents[node->nodelen - 1] = '\n'; node->contents[node->nodelen] = '\0'; return (node); } /* Useful functions can be called from outside of window.c. */ void initialize_message_buffer (void) { message_buffer_index = 0; } /* Print FORMAT with ARG1,2 to the end of the current message buffer. */ void printf_to_message_buffer (char *format, void *arg1, void *arg2, void *arg3) { build_message_buffer (format, arg1, arg2, arg3); } /* Return the current horizontal position of the "cursor" on the most recently output message buffer line. */ int message_buffer_length_this_line (void) { register int i; if (!message_buffer_index) return (0); for (i = message_buffer_index; i && message_buffer[i - 1] != '\n'; i--); return (string_width (message_buffer + i, 0)); } /* Pad STRING to COUNT characters by inserting blanks. */ int pad_to (int count, char *string) { register int i; i = strlen (string); if (i >= count) string[i++] = ' '; else { while (i < count) string[i++] = ' '; } string[i] = '\0'; return (i); }