head 1.1;A access ; symbols ; locks ; strict; comment @ * @; 1.1 date 85.03.31.18.11.46; author bbanerje; state Exp; branches ; next ; desc @@ 1.1 log @Initial revision @ text @/* Display generation from window structure and buffer text. Copyright (C) 1985 Richard M. Stallman. This file is part of GNU Emacs. GNU Emacs is distributed in the hope that it will be useful, but without any warranty. No author or distributor accepts responsibility to anyone for the consequences of using it or for whether it serves any particular purpose or works at all, unless he says so in writing. Everyone is granted permission to copy, modify and redistribute GNU Emacs, but only under the conditions described in the document "GNU Emacs copying permission notice". An exact copy of the document is supposed to have been given to you along with GNU Emacs so that you can know how you may redistribute it all. It should be in a file named COPYING. Among other things, the copyright notice and this notice must be preserved on all copies. */ #include "config.h" #include #include "lisp.h" #include "window.h" #include "disp_extern.h" #include "buffer.h" #include "indent.h" #include "commands.h" #include "macros.h" int RecurseDepth; /* Depth of recursion in recursive edits */ #define min(a, b) ((a) < (b) ? (a) : (b)) #define max(a, b) ((a) > (b) ? (a) : (b)) /* The buffer position of the first character appearing entirely or partially on the current screen line. Or zero, which disables the optimization for the current screen line. */ int this_line_bufpos; /* Number of characters past the end of this line, including the terminating newline */ int this_line_endpos; /* The vertical position of this screen line. */ int this_line_vpos; /* Hpos value for start of display on this screen line. Usually zero, but negative if first character really began on previous line */ int this_line_hpos; /* Buffer that this_line variables are describing. */ struct buffer *this_line_buffer; /* Value of minibuf_message when it was last acted on. If this is nonzero, there is a message on the screen in the minibuffer and it should be erased as soon as it is no longer requested to appear. */ char *prev_minibuf_message; Lisp_Object Vglobal_mode_string; Lisp_Object Vglobal_minor_modes; /* The number of lines to try scrolling a window by when dot leaves the window; if it is <=0 then dot is centered in the window */ int scroll_step; /* Nonzero if try_window_id has made blank lines at window bottom since the last redisplay that paused */ int blank_end_of_window; /* Number of windows showing the buffer of the selected window. */ static int buffer_shared; /* display_text_line sets these to the screen position (origin 0) of dot, whether the window is selected or not. Set one to -1 first to determine whether dot was found afterwards. */ int dot_vpos; int dot_hpos; int debug_end_pos; extern int default_ctl_arrow; /* Nonzero means display ctl chars */ /* with uparrow in mode lines, etc */ struct position display_text_line (); DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "", "Clear the screen and output again what is supposed to appear on it.") () { ScreenGarbaged++; return Qnil; } static char buf[200]; /* dump an informative message to the minibuf */ message (m, a1, a2, a3) { if (!INTERACTIVE) return; sprintf (buf, m, a1, a2, a3); minibuf_message = buf; display_minibuf_message (); UpdateScreen (1, 1); } /* Specify m, a string, as a message in the minibuf. */ message1 (m) char *m; { if (!INTERACTIVE) return; minibuf_message = m; display_minibuf_message (); UpdateScreen (1, 1); } display_minibuf_message () { register int vpos; register struct display_line *line; if (minibuf_message || !MinibufDepth) { vpos = XFASTINT (XWINDOW (minibuf_window)->top); line = get_display_line (vpos, 0); display_string (XWINDOW (minibuf_window), line, minibuf_message ? minibuf_message : "", 0, 0); /* If desired cursor location is on this line, put it at end of text */ if (cursY == vpos + 1) cursX = line->length + 1; } else if (!EQ (minibuf_window, selected_window)) windows_or_buffers_changed++; if (EQ (minibuf_window, selected_window)) this_line_bufpos = 0; prev_minibuf_message = minibuf_message; } /* Do a screen update, taking possible shortcuts into account. This is the main external entry point for redisplay */ DoDsp (SaveMiniBuf) { register struct window *w = XWINDOW (selected_window); register int pause; int inhibit_hairy_id = 0; int must_finish = 0; int all_windows = 0; register int tlbufpos, tlendpos; struct position pos; if (ScreenGarbaged) { windows_or_buffers_changed++; /* Mark all windows as INaccurate, to avoid problems if this display pauses due to input and we must finish next time without ScreenGarbaged set */ mark_window_display_accurate (XWINDOW (minibuf_window)->prev, 0); } if (minibuf_message || (prev_minibuf_message && !SaveMiniBuf)) { display_minibuf_message (); must_finish = 1; } if (clip_changed || windows_or_buffers_changed) RedoModes++; /* Detect case that we need to write a star in the mode line. */ if (XFASTINT (w->last_modified) < bf_modified && XFASTINT (w->last_modified) <= bf_cur->save_modified) w->redo_mode_line = Qt; all_windows = RedoModes || buffer_shared > 1; tlbufpos = this_line_bufpos; tlendpos = this_line_endpos; if (!all_windows && tlbufpos > 0 && NULL (w->redo_mode_line) /* Dot must be on the line that we have info recorded about */ && dot >= tlbufpos && dot <= bf_s1 + bf_s2 + 1 - tlendpos /* All text outside that line, including its final newline, must be unchanged */ && (XFASTINT (w->last_modified) >= bf_modified || (beg_unchanged >= tlbufpos - 1 && bf_s1 >= tlbufpos - 1 && end_unchanged >= tlendpos && bf_s2 >= tlendpos)) /* Make sure recorded data applies to current buffer, etc */ && NULL (w->force_start) && bf_cur == XBUFFER (w->buffer) && this_line_buffer == bf_cur) { if (tlbufpos > FirstCharacter && CharAt (tlbufpos - 1) != '\n' && (tlbufpos == NumCharacters + 1 || CharAt (tlbufpos) == '\n')) /* Former continuation line has disappeared by becoming empty */ ; else if (XFASTINT (w->last_modified) < bf_modified || EQ (selected_window, minibuf_window)) { dot_vpos = -1; display_text_line (w, tlbufpos, this_line_vpos, this_line_hpos); /* If line contains dot, is not continued, and ends at same distance from eob as before, we win */ if (dot_vpos >= 0 && this_line_bufpos && this_line_endpos == tlendpos) { cursX = dot_hpos + 1; if (XFASTINT (w->width) != ScreenWidth) preserve_other_columns (w); goto update; } } else if (dot == XFASTINT (w->last_dot)) { if (!must_finish) return; } else { pos = compute_motion (tlbufpos, 0, XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0, dot, 2, - (1 << (SHORTBITS - 1)), XFASTINT (w->width) - 1 - (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth), XINT (w->hscroll)); if (pos.vpos < 1) { cursX = max (XFASTINT (w->left), pos.hpos) + 1; goto update; } } /* Text changed drastically or dot moved off of line */ cancel_line (this_line_vpos); } this_line_bufpos = 0; if (all_windows) redisplay_all_windows (); else { inhibit_hairy_id = redisplay_window (selected_window, 1); if (XFASTINT (w->width) != ScreenWidth) preserve_other_columns (w); } update: pause = UpdateScreen (0, inhibit_hairy_id); /* If screen does not match, prevent doing single-line-update next time */ if (pause) this_line_bufpos = 0; /* Now text on screen agrees with windows, so put info into the windows for partial redisplay to follow */ if (!pause) { register struct buffer_text *t = XBUFFER (w->buffer) == bf_cur ? &bf_text : &XBUFFER (w->buffer)->text; blank_end_of_window = 0; clip_changed = 0; unchanged_modified = t->modified; beg_unchanged = t->size1, end_unchanged = t->size2; XFASTINT (w->last_dot) = t->dotloc; XFASTINT (w->last_dot_x) = cursX; XFASTINT (w->last_dot_y) = cursY; if (all_windows) mark_window_display_accurate (XWINDOW (minibuf_window)->prev, 1); else { w->redo_mode_line = Qnil; XFASTINT (w->last_modified) = t->modified; if (XFASTINT (w->window_end_pos) < 0) XFASTINT (w->window_end_pos) = -1 - XFASTINT (w->window_end_pos); } RedoModes = 0; windows_or_buffers_changed = 0; } } mark_window_display_accurate (window, flag) Lisp_Object window; int flag; { register struct window *w; for (;!NULL (window); window = w->next) { w = XWINDOW (window); XFASTINT (w->last_modified) = !flag ? 0 : XBUFFER (w->buffer) == bf_cur ? bf_modified : XBUFFER (w->buffer)->text.modified; if (XFASTINT (w->window_end_pos) < 0) XFASTINT (w->window_end_pos) = -1 - XFASTINT (w->window_end_pos); w->redo_mode_line = Qnil; if (!NULL (w->vchild)) mark_window_display_accurate (w->vchild, flag); if (!NULL (w->hchild)) mark_window_display_accurate (w->hchild, flag); } } int do_id = 1; /* Do full redisplay of one or all windows. This does not include updating the screen; just generating lines to pass to UpdateScreen. */ /* Entry point to redisplay all windows */ redisplay_all_windows () { buffer_shared = 0; redisplay_windows (XWINDOW (minibuf_window)->prev); } redisplay_windows (window) Lisp_Object window; { for (; !NULL (window); window = XWINDOW (window)->next) redisplay_window (window, 0); } redisplay_window (window, just_this_one) Lisp_Object window; int just_this_one; { register struct window *w = XWINDOW (window); int height; register int ldot = dot; struct buffer *old = bf_cur; register int width = XFASTINT (w->width) - 1 - (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth); register int startp = marker_position (w->start); register int hscroll = XINT (w->hscroll); struct position pos; int inhibit_hairy_id = 0; /* If this is a combination window, do its children; that's all. */ if (!NULL (w->vchild)) return redisplay_windows (w->vchild); if (!NULL (w->hchild)) return redisplay_windows (w->hchild); if (NULL (w->buffer)) abort (); if (RedoModes) w->redo_mode_line = Qt; /* Otherwise set up data on this window; select its buffer and dot value */ height = XFASTINT (w->height); if (w != XWINDOW (minibuf_window)) height--; else if (minibuf_message) return; SetBfx (XBUFFER (w->buffer)); if (!just_this_one && bf_cur == XBUFFER (XWINDOW (selected_window)->buffer)) buffer_shared++; if (!EQ (window, selected_window)) SetDot (marker_position (w->dotm)); /* Handle case where place to start displaying has been specified */ if (!NULL (w->force_start)) { w->redo_mode_line = Qt; w->force_start = Qnil; XFASTINT (w->last_modified) = 0; if (!try_window (window, startp)) { /* If dot does not appear, move dot so it does appear */ pos = compute_motion (startp, 0, hscroll ? 1 - hscroll : 0, NumCharacters + 1, height / 2, - (1 << (SHORTBITS - 1)), width, hscroll); SetDot (pos.bufpos); if (w != XWINDOW (selected_window)) Fset_marker (w->dotm, make_number (dot), Qnil); else ldot = dot; if (EQ (window, selected_window)) { cursX = max (0, pos.hpos) + 1 + XFASTINT (w->left); cursY = pos.vpos + 1 + XFASTINT (w->top); } } goto done; } /* Handle case where text has not changed, only dot, and it has not moved off the screen */ if (XFASTINT (w->last_modified) >= bf_modified && dot >= startp && !clip_changed && (just_this_one || XFASTINT (w->width) == ScreenWidth) /* Cannot do this in minibuffer, since it does not take the prompt string into account. */ && !EQ (window, minibuf_window)) { pos = compute_motion (startp, 0, hscroll ? 1 - hscroll : 0, dot, 10000, 10000, width, hscroll); if (pos.vpos < height) { /* Ok, dot is still on screen */ if (w == XWINDOW (selected_window)) { /* These variables are supposed to be origin 1 */ cursX = max (0, pos.hpos) + 1 + XFASTINT (w->left); cursY = pos.vpos + 1 + XFASTINT (w->top); } /* This doesn't do the trick, because if a window to the right of this one must be redisplayed, this does nothing because there is nothing in DesiredScreen yet, and then the other window is redisplayed, making likes that are empty in this window's columns. if (XFASTINT (w->width) != ScreenWidth) preserve_my_columns (w); */ goto done; } /* Don't bother trying redisplay with same start; we already know it will lose */ } else if (just_this_one && !EQ (window, minibuf_window) && dot >= startp && XFASTINT (w->last_modified) && XFASTINT (w->window_end_pos) >= 0 && do_id && !clip_changed && !blank_end_of_window && XFASTINT (w->width) == ScreenWidth && try_window_id (selected_window)) { /* inhibit_hairy_id = 1; */ goto done; } else if (startp >= FirstCharacter && startp <= NumCharacters + 1 /* Avoid starting display at end of buffer! */ && (startp <= NumCharacters || startp == FirstCharacter)) { /* Try to redisplay starting at same place as before */ /* If point has not moved off screen, accept the results */ if (try_window (window, startp)) goto done; else cancel_my_columns (w); } XFASTINT (w->last_modified) = 0; w->redo_mode_line = Qt; /* Try to scroll by specified few lines */ if (scroll_step) { if (dot > startp) { pos = vmotion (bf_s1 + bf_s2 + 1 - XFASTINT (w->window_end_pos), scroll_step, width, hscroll); if (pos.vpos >= height) goto scroll_fail; } pos = vmotion (startp, dot < startp ? - scroll_step : scroll_step, width, hscroll); if (dot >= pos.bufpos) { if (try_window (window, pos.bufpos)) goto done; else cancel_my_columns (w); } scroll_fail: ; } /* Finally, just choose place to start which centers dot */ pos = vmotion (dot, - height / 2, width, hscroll); try_window (window, pos.bufpos); done: /* If window not full width, must redo its mode line if the window to its side is being redone */ if ((!NULL (w->redo_mode_line) || (!just_this_one && width < ScreenWidth - 1)) && !EQ (window, minibuf_window)) display_mode_line (w); SetBfx (old); SetDot (ldot); return inhibit_hairy_id; } int dot_vpos; int dot_hpos; /* Do full redisplay on one window, starting at position `pos', and return nonzero if dot appears in the displayed text */ try_window (window, pos) Lisp_Object window; register int pos; { register struct window *w = XWINDOW (window); register int height = XFASTINT (w->height) - !EQ (window, minibuf_window); register int vpos = XFASTINT (w->top); register int last_text_vpos = vpos; struct position val; Fset_marker (w->start, make_number (pos), Qnil); dot_vpos = -1; val.hpos = XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0; while (--height >= 0) { val = display_text_line (w, pos, vpos, val.hpos); vpos++; if (pos != val.bufpos) last_text_vpos /* Next line, unless prev line ended in end of buffer with no cr */ = vpos - (val.vpos && CharAt (val.bufpos - 1) != '\n'); pos = val.bufpos; } /* If last line is continued in middle of character, include the split character in the text considered on the screen */ if (val.hpos < XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0) pos++; /* Make this -1 minus what it really should be, so that it is negative. That serves as a signal that it is not really valid. When screen updating is through, change this to its correct positive value */ XFASTINT (w->window_end_pos) = -1 - (bf_s1 + bf_s2 + 1 - pos); XFASTINT (w->window_end_vpos) = last_text_vpos - XFASTINT (w->top); return dot_vpos >= 0; } /* Try to redisplay when buffer is modified locally, computing insert/delete line to preserve text outside the bounds of the changes */ try_window_id (window) Lisp_Object window; { register int pos; register struct window *w = XWINDOW (window); register int height = XFASTINT (w->height) - !EQ (window, minibuf_window); int top = XFASTINT (w->top); int start = marker_position (w->start); int width = XFASTINT (w->width) - 1 - (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth); int hscroll = XINT (w->hscroll); int lmargin = hscroll > 0 ? 1 - hscroll : 0; register int vpos; int tem; int last_text_vpos = 0; int stop_vpos; struct position val, bp, ep, xp, pp; int scroll_amount = 0; int delta; if (bf_s1 < beg_unchanged) beg_unchanged = bf_s1; if (bf_s2 < end_unchanged) end_unchanged = bf_s2; if (beg_unchanged + 1 < start) return 0; /* Give up if changes go above top of window */ /* Find position before which nothing is changed. */ bp = compute_motion (start, 0, lmargin, beg_unchanged + 1, 10000, 10000, width, hscroll); if (bp.vpos >= height) return dot < bp.bufpos && !bp.contin; vpos = bp.vpos; /* Find beginning of that screen line. Must display from there. */ bp = vmotion (bp.bufpos, 0, width, hscroll); pos = bp.bufpos; val.hpos = lmargin; /* If about to start displaying at the beginning of a continuation line, really start with previous screen line, in case it was not continued as of the last redisplay */ if (bp.contin && bp.bufpos - 1 == beg_unchanged) { bp = vmotion (bp.bufpos, -1, width, hscroll); --vpos; pos = bp.bufpos; } if (bp.contin && bp.hpos != lmargin) { val.hpos = bp.prevhpos - width + lmargin; pos--; } bp.vpos = vpos; /* Find first newline after which no more is changed */ ep = compute_motion (pos, vpos, lmargin, ScanBf ('\n', bf_s1 + bf_s2 + 1 - max (end_unchanged, bf_tail_clip), 1), height, - (1 << (SHORTBITS - 1)), width, hscroll); /* If changes reach past the text available on the screen, just display rest of screen. */ if (ep.bufpos > bf_s1 + bf_s2 + 1 - XFASTINT (w->window_end_pos)) stop_vpos = height; else stop_vpos = ep.vpos; /* If no newline before ep, the line ep is on includes some changes that must be displayed. Make sure we don't stop before it. */ /* Also, if changes reach all the way until ep.bufpos, it is possible that something was deleted after the newline before it, so the following line must be redrawn. */ if (stop_vpos == ep.vpos && ep.bufpos != FirstCharacter && (CharAt (ep.bufpos - 1) != '\n' || ep.bufpos == bf_s1 + bf_s2 + 1 - end_unchanged)) stop_vpos = ep.vpos + 1; /* If changes do not reach to bottom of window, figure out how much to scroll the rest of the window */ if (stop_vpos < height) { /* Now determine how far up or down the rest of the window has moved */ xp = compute_motion (ep.bufpos, ep.vpos, ep.hpos, bf_s1 + bf_s2 + 1 - XFASTINT (w->window_end_pos), 10000, 0, width, hscroll); scroll_amount = xp.vpos - XFASTINT (w->window_end_vpos); XFASTINT (w->window_end_vpos) += scroll_amount; /* Before doing any scrolling, verify that dot will be on screen. */ if (dot > ep.bufpos && !(dot <= xp.bufpos && xp.bufpos < height)) { if (dot <= xp.bufpos) { pp = compute_motion (ep.bufpos, ep.vpos, ep.hpos, dot, height, - (1 << (SHORTBITS - 1)), width, hscroll); } else { pp = compute_motion (xp.bufpos, xp.vpos, xp.hpos, dot, height, - (1 << (SHORTBITS - 1)), width, hscroll); } if (pp.bufpos < dot || pp.vpos == height) return 0; } if (stop_vpos - scroll_amount >= height || ep.bufpos == xp.bufpos) { if (scroll_amount < 0) stop_vpos -= scroll_amount; scroll_amount = 0; } else if (scroll_amount) { tem = scroll_screen_lines (ep.vpos + top - scroll_amount, top + height - max (0, scroll_amount), scroll_amount); if (!tem) stop_vpos = height; } } /* In any case, do not display past bottom of window */ if (stop_vpos >= height) { stop_vpos = height; scroll_amount = 0; } dot_vpos = -1; /* Handle case where pos is before w->start -- can happen if part of line had been clipped and is not clipped now */ if (vpos == 0 && pos < marker_position (w->start)) Fset_marker (w->start, make_number (pos), Qnil); /* Redisplay the lines where the text was changed */ last_text_vpos = vpos; while (vpos < stop_vpos) { val = display_text_line (w, pos, top + vpos++, val.hpos); if (pos != val.bufpos) last_text_vpos /* Next line, unless prev line ended in end of buffer with no cr */ = vpos - (val.vpos && CharAt (val.bufpos - 1) != '\n'); pos = val.bufpos; } /* There are two cases: 1) we have displayed down to the bottom of the window 2) we have scrolled lines below stop_vpos by scroll_amount */ if (vpos == height) { /* If last line is continued in middle of character, include the split character in the text considered on the screen */ if (val.hpos < lmargin) val.bufpos++; XFASTINT (w->window_end_vpos) = last_text_vpos; XFASTINT (w->window_end_pos) = -1 - (bf_s1 + bf_s2 + 1 - val.bufpos); } /* If scrolling made blank lines at window bottom, redisplay to fill those lines */ if (scroll_amount < 0) { vpos = xp.vpos; pos = xp.bufpos; val.hpos = lmargin; if (pos == NumCharacters + 1) vpos = height + scroll_amount; else if (xp.contin && xp.hpos != lmargin) { val.hpos = xp.prevhpos - width + lmargin; pos--; } blank_end_of_window = 1; while (vpos < height) { val = display_text_line (w, pos, top + vpos++, val.hpos); pos = val.bufpos; } } /* Attempt to adjust end-of-text positions to new bottom line */ if (scroll_amount) { delta = height - xp.vpos; if (delta < 0 || (delta > 0 && xp.bufpos <= NumCharacters) || (delta == 0 && xp.hpos)) { val = vmotion (bf_s1 + bf_s2 + 1 - XFASTINT (w->window_end_pos), delta, width, hscroll); XFASTINT (w->window_end_pos) = bf_s1 + bf_s2 + 1 - val.bufpos; XFASTINT (w->window_end_vpos) += val.vpos; } } /* If dot was not in a line that was displayed, find it */ if (dot_vpos < 0) { val = compute_motion (start, 0, lmargin, dot, 10000, 10000, width, hscroll); /* Admit failure if dot is off screen now */ if (val.vpos >= height) { for (vpos = 0; vpos < height; vpos++) cancel_line (vpos + top); return 0; } dot_vpos = val.vpos; dot_hpos = val.hpos; cursX = max (0, dot_hpos) + 1 + XFASTINT (w->left); cursY = dot_vpos + 1 + XFASTINT (w->top); } if (debug_end_pos) { val = compute_motion (start, 0, lmargin, NumCharacters + 1, height, - (1 << (SHORTBITS - 1)), width, hscroll); if (val.vpos != XFASTINT (w->window_end_vpos)) abort (); if ((XFASTINT (w->window_end_pos) < 0 ? -1 - XFASTINT (w->window_end_pos) : XFASTINT (w->window_end_pos)) != bf_s1 + bf_s2 + 1 - val.bufpos) abort (); } return 1; } /* Display one line of window w, starting at position `start' in w's buffer. Display starting at horizontal position `hpos', which is normally zero or negative. A negative value causes output up to hpos = 0 to be discarded. This is done for negative hscroll, or when this is a continuation line and the continuation occurred in the middle of a multi-column character. Display on position `vpos' on the screen. (origin 0). Returns a `struct position' giving character to start next line with and where to display it, including a zero or negative hpos. The vpos field is not really a vpos; it is 1 unless the line is continued */ struct position display_text_line (w, start, vpos, hpos) struct window *w; int start; int vpos; int hpos; { register int pos = start; register int c; register char *p1; int end; register int pause; register unsigned char *p; char *endp; register char *startp; register char *p1prev; register struct display_line *line; int tab_width = XFASTINT (XBUFFER (w->buffer)->tab_width); int ctl_arrow = !NULL (XBUFFER (w->buffer)->ctl_arrow); int width = XFASTINT (w->width) - 1 - (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth); struct position val; int lastpos; int invis; int hscroll = XINT (w->hscroll); int truncate = hscroll || !NULL (XBUFFER (w->buffer)->truncate_lines); int selective = XTYPE (bf_cur->selective_display) == Lisp_Int ? XINT (bf_cur->selective_display) : !NULL (bf_cur->selective_display) ? -1 : 0; hpos += XFASTINT (w->left); line = get_display_line (vpos, XFASTINT (w->left)); if (tab_width <= 0) tab_width = 1; if (w == XWINDOW (minibuf_window) && start == 1 && minibuf_prompt && vpos == XFASTINT (XWINDOW (minibuf_window)->top)) hpos = display_string (w, line, minibuf_prompt, hpos, !truncate ? '\\' : '$', 0); p1 = line->body + hpos; end = NumCharacters + 1; startp = line->body + XFASTINT (w->left); endp = startp + width; /* Loop generating characters. Stop at end of buffer, before newline, or if reach or pass continuation column. */ pause = pos; while (p1 < endp) { p1prev = p1; if (pos == pause) { if (pos == end) break; if (pos == dot && dot_vpos < 0) { dot_vpos = vpos; dot_hpos = p1 - startp; } pause = end; if (pos < dot && dot < pause) pause = dot; if (pos <= bf_s1 && bf_s1 + 1 < pause) pause = bf_s1 + 1; p = &CharAt (pos); } c = *p++; if (c >= 040 && c < 0177) { if (p1 >= startp) *p1 = c; p1++; } else if (c == '\n') { invis = 0; while (pos < end && selective > 0 && position_indentation (pos + 1) >= selective) { invis = 1; pos = ScanBf ('\n', pos + 1, 1); if (CharAt (pos - 1) == '\n') pos--; } if (invis) { p1 += 4; if (p1 - startp > width) p1 = endp; strncpy (p1prev, " ...", p1 - p1prev); } break; } else if (c == '\t') { do { if (p1 >= startp) *p1 = ' '; p1++; } while ((p1 - startp + hscroll - (hscroll > 0)) % tab_width); } else if (c == Ctl('M') && !NULL (bf_cur->selective_display)) { pos = ScanBf ('\n', pos, 1); if (CharAt (pos - 1) == '\n') pos--; break; } else if (c < 0200 && ctl_arrow) { if (p1 >= startp) *p1 = '^'; p1++; if (p1 >= startp) *p1 = c ^ 0100; p1++; } else { if (p1 >= startp) *p1 = '\\'; p1++; if (p1 >= startp) *p1 = (c >> 6) + '0'; p1++; if (p1 >= startp) *p1 = (7 & (c >> 3)) + '0'; p1++; if (p1 >= startp) *p1 = (7 & c) + '0'; p1++; } pos++; } val.hpos = - XINT (w->hscroll); if (val.hpos) { val.hpos++; /* If line not empty, insert truncation-at-left marker */ if (pos != start) { *startp = '$'; if (p1 <= startp) p1 = startp + 1; if (line->length <= XFASTINT (w->left)) line->length = XFASTINT (w->left) + 1; } } val.vpos = 1; /* Handle continuation in middle of a character */ /* by backing up over it */ if (p1 > endp) { /* Start the next line with that same character */ pos--; /* but at a negative hpos, to skip the columns output on this line. */ val.hpos += p1prev - endp; /* Keep in this line everything up to the continuation column. */ p1 = endp; } /* Finish deciding which character to start the next line on, and what hpos to start it at. Also set `lastpos' to the last position which counts as "on this line" for cursor-positioning. */ lastpos = pos; if (pos < NumCharacters + 1) { if (CharAt (pos) == '\n') /* If stopped due to a newline, start next line after it */ pos++; else /* Stopped due to right margin of window */ { if (truncate) { *p1++ = '$'; /* Truncating => start next line after next newline, and dot is on this line if it is before the newline, and skip none of first char of next line */ pos = ScanBf ('\n', pos, 1); val.hpos = XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0; lastpos = pos - (CharAt (pos - 1) == '\n'); } else { *p1++ = '\\'; val.vpos = 0; lastpos = 0; } } } if (start <= dot && dot <= lastpos && dot_vpos < 0) { dot_vpos = vpos; dot_hpos = p1 - startp; } if (dot_vpos == vpos) { if (dot_hpos < 0) dot_hpos = 0; if (dot_hpos > width) dot_hpos = width; dot_hpos += XFASTINT (w->left); if (w == XWINDOW (selected_window)) { cursY = dot_vpos + 1; cursX = dot_hpos + 1; /* Line is not continued and did not start in middle of character */ if (hpos == (XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0) && val.vpos) { this_line_bufpos = start; this_line_buffer = bf_cur; this_line_vpos = vpos; this_line_hpos = hpos; this_line_endpos = bf_s1 + bf_s2 + 1 - lastpos; } else this_line_bufpos = 0; } } if (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth) { endp++; if (p1 < startp) p1 = startp; while (p1 < endp) *p1++ = ' '; *p1++ = '|'; } line->length = max (line->length, p1 - line->body); line->body[line->length] = 0; val.bufpos = pos; return val; } /* Display the mode line for window w */ display_mode_line (w) struct window *w; { int vpos = XFASTINT (w->height) + XFASTINT (w->top) - 1; struct display_line *line = get_display_line (vpos, XFASTINT (w->left)); register unsigned char *s = XSTRING (bf_cur->mode_line_format)->data; display_string (w, line, s, XFASTINT (w->left), 0, 1); if (XFASTINT (w->width) == ScreenWidth) line->highlighted = 1; } char * fmodetrunc (str, width) char *str; long width; { static char buf[100]; char *bp = buf; long len; len = strlen(str); if (width && width < len) { strcpy(buf,str+len-width); if (buf[0] != '/') while (*bp) if (*bp++ == '/') { bp--; *--bp = '$'; return bp; } buf[0] = '$'; return buf; } return str; } char * decode_mode_spec (w, string, data_ptr, len_ptr, max_ptr) struct window *w; register char *string; char **data_ptr; int *len_ptr; int *max_ptr; { register int width = 0; register char c; Lisp_Object lstr, proc, list; register char *str; int len; int pos, total; static char tbuf[MScreenWidth + 1]; lstr = Qnil, str = 0; while (isdigit (c = *string++)) width = width * 10 + (c - '0'); switch (c) { case 'b': lstr = bf_cur->name; if (width && XSTRING (lstr)->size > width) width = min (2 * width, XSTRING (lstr)->size); if (width && XSTRING (lstr)->size > width) { str = (char *) alloca (width + 1); bcopy (XSTRING (lstr)->data, str, width - 3); bcopy ("...", str + width - 3, 4); lstr = Qnil; } break; case 'f': if (NULL (bf_cur->filename)) str = "[none]"; else if (XTYPE (bf_cur->filename) == Lisp_String) str = fmodetrunc (XSTRING (bf_cur -> filename)->data, width); break; case 'm': lstr = bf_cur->mode_name; total = min (XSTRING (lstr)->size, sizeof tbuf - 1); bcopy (XSTRING (lstr)->data, tbuf, total); len = 0; list = bf_cur->minor_modes; while (1) { if (!LISTP (list) && !len) { list = Vglobal_minor_modes; len = 1; } if (!(total < sizeof tbuf - 1 && LISTP (list))) break; lstr = XCONS (list)->car; if (!LISTP (lstr)) goto foo; lstr = XCONS (lstr)->cdr; if (XTYPE (lstr) != Lisp_String) goto foo; tbuf[total++] = ' '; pos = min (XSTRING (lstr)->size, sizeof tbuf - 1 - total); bcopy (XSTRING (lstr)->data, tbuf + total, pos); total += pos; foo: list = Fcdr (list); } str = tbuf; tbuf[total] = 0; if (defining_kbd_macro) strcat (tbuf, " Def"); lstr = Qnil; break; case 'M': lstr = Vglobal_mode_string; break; case '*': str = !NULL (bf_cur->read_only) ? "%" : bf_modified > bf_cur->save_modified ? "*" :"-"; break; case 's': /* status of process */ proc = Fget_buffer_process (Fcurrent_buffer ()); if (NULL (proc)) str = "no process"; else lstr = Fsymbol_name (Fprocess_status (proc)); break; case 'p': pos = marker_position (w->start); total = NumCharacters + 1 - FirstCharacter; if ((XFASTINT (w->window_end_pos) < 0 ? -1 - XFASTINT (w->window_end_pos) : XFASTINT (w->window_end_pos)) <= bf_tail_clip) { if (pos <= FirstCharacter) str = "All"; else str = "Bottom"; } else if (pos <= FirstCharacter) str = "Top"; else { sprintf (tbuf, "%2d%%", ((pos - FirstCharacter) * 100 + total - 1) / total); str = tbuf; } break; case '[': str = "[[[[[[[[[[" + 10 - (RecurseDepth - MinibufDepth); if (RecurseDepth - MinibufDepth > 10) str = "[[[... "; break; case ']': str = "]]]]]]]]]]" + 10 - (RecurseDepth - MinibufDepth); if (RecurseDepth - MinibufDepth > 10) str = " ...]]]"; break; case '-': str = "--------------------------------------------------------------------------------------------------------------------------------------------"; } /* Report the chosen mode item to the caller */ if (str) *data_ptr = str, *len_ptr = strlen (str); else if (XTYPE (lstr) == Lisp_String) *data_ptr = (char *) XSTRING (lstr)->data, *len_ptr = XSTRING (lstr)->size; else *data_ptr = 0, *len_ptr = 0; /* Report specified truncation or padding */ *max_ptr = width; /* Tell caller how much of mode line format was used up */ return string; } /* Display `string' on one line of window `w', starting at `hpos'. Display on the display_line `line', which should have been obtained by get_display_line (vpos, hpos) or in some suitable manner. `truncate' is character to display at end if truncated. `modeline' nonzero means substitute for % constructs. Returns ending hpos */ display_string (w, line, string, hpos, truncate, modeline) struct window *w; register struct display_line *line; char *string; int hpos; int truncate; int modeline; { register int c; register char *p; register char *p1; int width = XFASTINT (w->width) - 1 - (XFASTINT (w->width) + XFASTINT (w->left) != ScreenWidth); int hscroll = XINT (w->hscroll); int tab_width = 8; register char *start; register char *end; char *modeeltstring; int modeeltleft = 0; int modeeltmax = 0; p1 = line->body + hpos; start = line->body + XFASTINT (w->left); end = start + width; while (p1 < end) { if (modeeltmax) { modeeltmax--; if (modeeltleft-- > 0) c = *modeeltstring++; else c = ' '; } else { c = *string++; if (!c) break; if (c == '%' && modeline) { string = decode_mode_spec (w, string, &modeeltstring, &modeeltleft, &modeeltmax); if (!modeeltmax) modeeltmax = modeeltleft; else if (modeeltleft > modeeltmax) modeeltleft = modeeltmax; continue; } } if (c >= 040 && c < 0177) { if (p1 >= start) *p1 = c; p1++; } else if (c == '\t') { do { if (p1 >= start) *p1 = ' '; p1++; } while ((p1 - start + hscroll - (hscroll > 0)) % tab_width); } else if (c < 0200 && default_ctl_arrow) { if (p1 >= start) *p1 = '^'; p1++; if (p1 >= start) *p1 = c ^ 0100; p1++; } else { if (p1 >= start) *p1 = '\\'; p1++; if (p1 >= start) *p1 = (c >> 6) + '0'; p1++; if (p1 >= start) *p1 = (7 & (c >> 3)) + '0'; p1++; if (p1 >= start) *p1 = (7 & c) + '0'; p1++; } } if (c) { p1 = end; if (truncate) *p1++ = truncate; } line->length = max (line->length, p1 - line->body); line->body[line->length] = 0; return p1 - line->body; } syms_of_xdisp () { DefLispVar ("global-mode-string", &Vglobal_mode_string, "*String which mode line can display (if its format requests to)."); Vglobal_mode_string = Qnil; DefLispVar ("global-minor-modes", &Vglobal_minor_modes, "Alist of minor modes that are not per buffer.\n\ Cdr of each element is a string to display in mode line."); DefIntVar ("scroll-step", &scroll_step, "*The number of lines to try scrolling a window by when dot moves out.\n\ If that fails to bring dot back on screen, dot is centered instead.\n\ If this is zero, dot is always centered after it moves off screen."); DefIntVar ("debug-end-pos", &debug_end_pos, "Don't ask"); defsubr (&Sredraw_display); } /* initialize the window system */ init_xdisp () { Lisp_Object root_window; struct window *mini_w; /* Not register for Sun compiler's sake. */ this_line_bufpos = 0; mini_w = XWINDOW (minibuf_window); root_window = mini_w->prev; minibuf_message = 0; prev_minibuf_message = 0; XFASTINT (XWINDOW (root_window)->top) = 0; set_window_height (root_window, ScreenLength - 1); XFASTINT (mini_w->top) = ScreenLength - 1; set_window_height (minibuf_window, 1); XFASTINT (XWINDOW (root_window)->width) = ScreenWidth; XFASTINT (mini_w->width) = ScreenWidth; } @