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Diffstat (limited to 'src/move.c')
| -rw-r--r-- | src/move.c | 2796 |
1 files changed, 2796 insertions, 0 deletions
diff --git a/src/move.c b/src/move.c new file mode 100644 index 000000000..daa0fb7c1 --- /dev/null +++ b/src/move.c @@ -0,0 +1,2796 @@ +/* vi:set ts=8 sts=4 sw=4: + * + * VIM - Vi IMproved by Bram Moolenaar + * + * Do ":help uganda" in Vim to read copying and usage conditions. + * Do ":help credits" in Vim to see a list of people who contributed. + * See README.txt for an overview of the Vim source code. + */ +/* + * move.c: Functions for moving the cursor and scrolling text. + * + * There are two ways to move the cursor: + * 1. Move the cursor directly, the text is scrolled to keep the cursor in the + * window. + * 2. Scroll the text, the cursor is moved into the text visible in the + * window. + * The 'scrolloff' option makes this a bit complicated. + */ + +#include "vim.h" + +static void comp_botline __ARGS((win_T *wp)); +static int check_top_offset __ARGS((void)); +static void curs_rows __ARGS((win_T *wp, int do_botline)); +static void validate_botline_win __ARGS((win_T *wp)); +static void validate_cheight __ARGS((void)); + +typedef struct +{ + linenr_T lnum; /* line number */ +#ifdef FEAT_DIFF + int fill; /* filler lines */ +#endif + int height; /* height of added line */ +} lineoff_T; + +static void topline_back __ARGS((lineoff_T *lp)); +static void botline_forw __ARGS((lineoff_T *lp)); +#ifdef FEAT_DIFF +static void botline_topline __ARGS((lineoff_T *lp)); +static void topline_botline __ARGS((lineoff_T *lp)); +static void max_topfill __ARGS((void)); +#endif + +/* + * Compute wp->w_botline for the current wp->w_topline. Can be called after + * wp->w_topline changed. + */ + static void +comp_botline(wp) + win_T *wp; +{ + int n; + linenr_T lnum; + int done; +#ifdef FEAT_FOLDING + linenr_T last; + int folded; +#endif + + /* + * If w_cline_row is valid, start there. + * Otherwise have to start at w_topline. + */ + check_cursor_moved(wp); + if (wp->w_valid & VALID_CROW) + { + lnum = wp->w_cursor.lnum; + done = wp->w_cline_row; + } + else + { + lnum = wp->w_topline; + done = 0; + } + + for ( ; lnum <= wp->w_buffer->b_ml.ml_line_count; ++lnum) + { +#ifdef FEAT_FOLDING + last = lnum; + folded = FALSE; + if (hasFoldingWin(wp, lnum, NULL, &last, TRUE, NULL)) + { + n = 1; + folded = TRUE; + } + else +#endif +#ifdef FEAT_DIFF + if (lnum == wp->w_topline) + n = plines_win_nofill(wp, lnum, TRUE) + wp->w_topfill; + else +#endif + n = plines_win(wp, lnum, TRUE); + if ( +#ifdef FEAT_FOLDING + lnum <= wp->w_cursor.lnum && last >= wp->w_cursor.lnum +#else + lnum == wp->w_cursor.lnum +#endif + ) + { + wp->w_cline_row = done; + wp->w_cline_height = n; +#ifdef FEAT_FOLDING + wp->w_cline_folded = folded; +#endif + wp->w_valid |= (VALID_CROW|VALID_CHEIGHT); + } + if (done + n > wp->w_height) + break; + done += n; +#ifdef FEAT_FOLDING + lnum = last; +#endif + } + + /* wp->w_botline is the line that is just below the window */ + wp->w_botline = lnum; + wp->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; + + set_empty_rows(wp, done); +} + +/* + * Update curwin->w_topline and redraw if necessary. + * Used to update the screen before printing a message. + */ + void +update_topline_redraw() +{ + update_topline(); + if (must_redraw) + update_screen(0); +} + +/* + * Update curwin->w_topline to move the cursor onto the screen. + */ + void +update_topline() +{ + long line_count; + int halfheight; + int n; + linenr_T old_topline; +#ifdef FEAT_DIFF + int old_topfill; +#endif +#ifdef FEAT_FOLDING + linenr_T lnum; +#endif + int check_topline = FALSE; + int check_botline = FALSE; +#ifdef FEAT_MOUSE + int save_so = p_so; +#endif + + if (!screen_valid(TRUE)) + return; + + check_cursor_moved(curwin); + if (curwin->w_valid & VALID_TOPLINE) + return; + +#ifdef FEAT_MOUSE + /* When dragging with the mouse, don't scroll that quickly */ + if (mouse_dragging) + p_so = mouse_dragging - 1; +#endif + + old_topline = curwin->w_topline; +#ifdef FEAT_DIFF + old_topfill = curwin->w_topfill; +#endif + + /* + * If the buffer is empty, always set topline to 1. + */ + if (bufempty()) /* special case - file is empty */ + { + if (curwin->w_topline != 1) + redraw_later(NOT_VALID); + curwin->w_topline = 1; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + curwin->w_botline = 2; + curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; +#ifdef FEAT_SCROLLBIND + curwin->w_scbind_pos = 1; +#endif + } + + /* + * If the cursor is above or near the top of the window, scroll the window + * to show the line the cursor is in, with 'scrolloff' context. + */ + else + { + if (curwin->w_topline > 1) + { + /* If the cursor is above topline, scrolling is always needed. + * If the cursor is far below topline and there is no folding, + * scrolling down is never needed. */ + if (curwin->w_cursor.lnum < curwin->w_topline) + check_topline = TRUE; + else if (check_top_offset()) + check_topline = TRUE; + } +#ifdef FEAT_DIFF + /* Check if there are more filler lines than allowed. */ + if (!check_topline && curwin->w_topfill > diff_check_fill(curwin, + curwin->w_topline)) + check_topline = TRUE; +#endif + + if (check_topline) + { + halfheight = curwin->w_height / 2 - 1; + if (halfheight < 2) + halfheight = 2; + +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + /* Count the number of logical lines between the cursor and + * topline + p_so (approximation of how much will be + * scrolled). */ + n = 0; + for (lnum = curwin->w_cursor.lnum; + lnum < curwin->w_topline + p_so; ++lnum) + { + ++n; + /* stop at end of file or when we know we are far off */ + if (lnum >= curbuf->b_ml.ml_line_count || n >= halfheight) + break; + (void)hasFolding(lnum, NULL, &lnum); + } + } + else +#endif + n = curwin->w_topline + p_so - curwin->w_cursor.lnum; + + /* If we weren't very close to begin with, we scroll to put the + * cursor in the middle of the window. Otherwise put the cursor + * near the top of the window. */ + if (n >= halfheight) + scroll_cursor_halfway(FALSE); + else + { + scroll_cursor_top((int)p_sj, FALSE); + check_botline = TRUE; + } + } + + else + { +#ifdef FEAT_FOLDING + /* Make sure topline is the first line of a fold. */ + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + check_botline = TRUE; + } + } + + /* + * If the cursor is below the bottom of the window, scroll the window + * to put the cursor on the window. + * When w_botline is invalid, recompute it first, to avoid a redraw later. + * If w_botline was approximated, we might need a redraw later in a few + * cases, but we don't want to spend (a lot of) time recomputing w_botline + * for every small change. + */ + if (check_botline) + { + if (!(curwin->w_valid & VALID_BOTLINE_AP)) + validate_botline(); + + if (curwin->w_botline <= curbuf->b_ml.ml_line_count) + { + if (curwin->w_cursor.lnum < curwin->w_botline + && ((long)curwin->w_cursor.lnum + >= (long)curwin->w_botline - p_so +#ifdef FEAT_FOLDING + || hasAnyFolding(curwin) +#endif + )) + { + lineoff_T loff; + + /* Cursor is above botline, check if there are 'scrolloff' + * window lines below the cursor. If not, need to scroll. */ + n = curwin->w_empty_rows; + loff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_FOLDING + /* In a fold go to its last line. */ + (void)hasFolding(loff.lnum, NULL, &loff.lnum); +#endif +#ifdef FEAT_DIFF + loff.fill = 0; + n += curwin->w_filler_rows; +#endif + loff.height = 0; + while (loff.lnum < curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum + 1 < curwin->w_botline || loff.fill == 0) +#endif + ) + { + n += loff.height; + if (n >= p_so) + break; + botline_forw(&loff); + } + if (n >= p_so) + /* sufficient context, no need to scroll */ + check_botline = FALSE; + } + if (check_botline) + { +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + /* Count the number of logical lines between the cursor and + * botline - p_so (approximation of how much will be + * scrolled). */ + line_count = 0; + for (lnum = curwin->w_cursor.lnum; + lnum >= curwin->w_botline - p_so; --lnum) + { + ++line_count; + /* stop at end of file or when we know we are far off */ + if (lnum <= 0 || line_count > curwin->w_height + 1) + break; + (void)hasFolding(lnum, &lnum, NULL); + } + } + else +#endif + line_count = curwin->w_cursor.lnum - curwin->w_botline + + 1 + p_so; + if (line_count <= curwin->w_height + 1) + scroll_cursor_bot((int)p_sj, FALSE); + else + scroll_cursor_halfway(FALSE); + } + } + } + curwin->w_valid |= VALID_TOPLINE; + + /* + * Need to redraw when topline changed. + */ + if (curwin->w_topline != old_topline +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + ) + { + dollar_vcol = 0; + if (curwin->w_skipcol) + { + curwin->w_skipcol = 0; + redraw_later(NOT_VALID); + } + else + redraw_later(VALID); + /* May need to set w_skipcol when cursor in w_topline. */ + if (curwin->w_cursor.lnum == curwin->w_topline) + validate_cursor(); + } + +#ifdef FEAT_MOUSE + p_so = save_so; +#endif +} + +/* + * Return TRUE when there are not 'scrolloff' lines above the cursor for the + * current window. + */ + static int +check_top_offset() +{ + lineoff_T loff; + int n; + + if (curwin->w_cursor.lnum < curwin->w_topline + p_so +#ifdef FEAT_FOLDING + || hasAnyFolding(curwin) +#endif + ) + { + loff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_DIFF + loff.fill = 0; + n = curwin->w_topfill; /* always have this context */ +#else + n = 0; +#endif + /* Count the visible screen lines above the cursor line. */ + while (n < p_so) + { + topline_back(&loff); + /* Stop when included a line above the window. */ + if (loff.lnum < curwin->w_topline +#ifdef FEAT_DIFF + || (loff.lnum == curwin->w_topline && loff.fill > 0) +#endif + ) + break; + n += loff.height; + } + if (n < p_so) + return TRUE; + } + return FALSE; +} + + void +update_curswant() +{ + if (curwin->w_set_curswant) + { + validate_virtcol(); + curwin->w_curswant = curwin->w_virtcol; + curwin->w_set_curswant = FALSE; + } +} + +/* + * Check if the cursor has moved. Set the w_valid flag accordingly. + */ + void +check_cursor_moved(wp) + win_T *wp; +{ + if (wp->w_cursor.lnum != wp->w_valid_cursor.lnum) + { + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CHEIGHT|VALID_CROW|VALID_TOPLINE); + wp->w_valid_cursor = wp->w_cursor; + wp->w_valid_leftcol = wp->w_leftcol; + } + else if (wp->w_cursor.col != wp->w_valid_cursor.col + || wp->w_leftcol != wp->w_valid_leftcol +#ifdef FEAT_VIRTUALEDIT + || wp->w_cursor.coladd != wp->w_valid_cursor.coladd +#endif + ) + { + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL); + wp->w_valid_cursor.col = wp->w_cursor.col; + wp->w_valid_leftcol = wp->w_leftcol; +#ifdef FEAT_VIRTUALEDIT + wp->w_valid_cursor.coladd = wp->w_cursor.coladd; +#endif + } +} + +/* + * Call this function when some window settings have changed, which require + * the cursor position, botline and topline to be recomputed and the window to + * be redrawn. E.g, when changing the 'wrap' option or folding. + */ + void +changed_window_setting() +{ + changed_window_setting_win(curwin); +} + + void +changed_window_setting_win(wp) + win_T *wp; +{ + wp->w_lines_valid = 0; + changed_line_abv_curs_win(wp); + wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP|VALID_TOPLINE); + redraw_win_later(wp, NOT_VALID); +} + +/* + * Set wp->w_topline to a certain number. + */ + void +set_topline(wp, lnum) + win_T *wp; + linenr_T lnum; +{ +#ifdef FEAT_FOLDING + /* go to first of folded lines */ + (void)hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL); +#endif + /* Approximate the value of w_botline */ + wp->w_botline += lnum - wp->w_topline; + wp->w_topline = lnum; +#ifdef FEAT_DIFF + wp->w_topfill = 0; +#endif + wp->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_TOPLINE); + /* Don't set VALID_TOPLINE here, 'scrolloff' needs to be checked. */ + redraw_later(VALID); +} + +/* + * Call this function when the length of the cursor line (in screen + * characters) has changed, and the change is before the cursor. + * Need to take care of w_botline separately! + */ + void +changed_cline_bef_curs() +{ + curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CHEIGHT|VALID_TOPLINE); +} + + void +changed_cline_bef_curs_win(wp) + win_T *wp; +{ + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL + |VALID_CHEIGHT|VALID_TOPLINE); +} + +#if 0 /* not used */ +/* + * Call this function when the length of the cursor line (in screen + * characters) has changed, and the position of the cursor doesn't change. + * Need to take care of w_botline separately! + */ + void +changed_cline_aft_curs() +{ + curwin->w_valid &= ~VALID_CHEIGHT; +} +#endif + +/* + * Call this function when the length of a line (in screen characters) above + * the cursor have changed. + * Need to take care of w_botline separately! + */ + void +changed_line_abv_curs() +{ + curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + + void +changed_line_abv_curs_win(wp) + win_T *wp; +{ + wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW + |VALID_CHEIGHT|VALID_TOPLINE); +} + +/* + * Make sure the value of curwin->w_botline is valid. + */ + void +validate_botline() +{ + if (!(curwin->w_valid & VALID_BOTLINE)) + comp_botline(curwin); +} + +/* + * Make sure the value of wp->w_botline is valid. + */ + static void +validate_botline_win(wp) + win_T *wp; +{ + if (!(wp->w_valid & VALID_BOTLINE)) + comp_botline(wp); +} + +/* + * Mark curwin->w_botline as invalid (because of some change in the buffer). + */ + void +invalidate_botline() +{ + curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); +} + + void +invalidate_botline_win(wp) + win_T *wp; +{ + wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); +} + +#if 0 /* never used */ +/* + * Mark curwin->w_botline as approximated (because of some small change in the + * buffer). + */ + void +approximate_botline() +{ + curwin->w_valid &= ~VALID_BOTLINE; +} +#endif + + void +approximate_botline_win(wp) + win_T *wp; +{ + wp->w_valid &= ~VALID_BOTLINE; +} + +#if 0 /* not used */ +/* + * Return TRUE if curwin->w_botline is valid. + */ + int +botline_valid() +{ + return (curwin->w_valid & VALID_BOTLINE); +} +#endif + +#if 0 /* not used */ +/* + * Return TRUE if curwin->w_botline is valid or approximated. + */ + int +botline_approximated() +{ + return (curwin->w_valid & VALID_BOTLINE_AP); +} +#endif + +/* + * Return TRUE if curwin->w_wrow and curwin->w_wcol are valid. + */ + int +cursor_valid() +{ + check_cursor_moved(curwin); + return ((curwin->w_valid & (VALID_WROW|VALID_WCOL)) == + (VALID_WROW|VALID_WCOL)); +} + +/* + * Validate cursor position. Makes sure w_wrow and w_wcol are valid. + * w_topline must be valid, you may need to call update_topline() first! + */ + void +validate_cursor() +{ + check_cursor_moved(curwin); + if ((curwin->w_valid & (VALID_WCOL|VALID_WROW)) != (VALID_WCOL|VALID_WROW)) + curs_columns(TRUE); +} + +#if defined(FEAT_GUI) || defined(PROTO) +/* + * validate w_cline_row. + */ + void +validate_cline_row() +{ + /* + * First make sure that w_topline is valid (after moving the cursor). + */ + update_topline(); + check_cursor_moved(curwin); + if (!(curwin->w_valid & VALID_CROW)) + curs_rows(curwin, FALSE); +} +#endif + +/* + * Compute wp->w_cline_row and wp->w_cline_height, based on the current value + * of wp->w_topine. + * + * Returns OK when cursor is in the window, FAIL when it isn't. + */ + static void +curs_rows(wp, do_botline) + win_T *wp; + int do_botline; /* also compute w_botline */ +{ + linenr_T lnum; + int i; + int all_invalid; + int valid; +#ifdef FEAT_FOLDING + long fold_count; +#endif + + /* Check if wp->w_lines[].wl_size is invalid */ + all_invalid = (!redrawing() + || wp->w_lines_valid == 0 + || wp->w_lines[0].wl_lnum > wp->w_topline); + i = 0; + wp->w_cline_row = 0; + for (lnum = wp->w_topline; lnum < wp->w_cursor.lnum; ++i) + { + valid = FALSE; + if (!all_invalid && i < wp->w_lines_valid) + { + if (wp->w_lines[i].wl_lnum < lnum || !wp->w_lines[i].wl_valid) + continue; /* skip changed or deleted lines */ + if (wp->w_lines[i].wl_lnum == lnum) + { +#ifdef FEAT_FOLDING + /* Check for newly inserted lines below this row, in which + * case we need to check for folded lines. */ + if (!wp->w_buffer->b_mod_set + || wp->w_lines[i].wl_lastlnum < wp->w_cursor.lnum + || wp->w_buffer->b_mod_top + > wp->w_lines[i].wl_lastlnum + 1) +#endif + valid = TRUE; + } + else if (wp->w_lines[i].wl_lnum > lnum) + --i; /* hold at inserted lines */ + } + if (valid +#ifdef FEAT_DIFF + && (lnum != wp->w_topline || !wp->w_p_diff) +#endif + ) + { +#ifdef FEAT_FOLDING + lnum = wp->w_lines[i].wl_lastlnum + 1; + /* Cursor inside folded lines, don't count this row */ + if (lnum > wp->w_cursor.lnum) + break; +#else + ++lnum; +#endif + wp->w_cline_row += wp->w_lines[i].wl_size; + } + else + { +#ifdef FEAT_FOLDING + fold_count = foldedCount(wp, lnum, NULL); + if (fold_count) + { + lnum += fold_count; + if (lnum > wp->w_cursor.lnum) + break; + ++wp->w_cline_row; + } + else +#endif +#ifdef FEAT_DIFF + if (lnum == wp->w_topline) + wp->w_cline_row += plines_win_nofill(wp, lnum++, TRUE) + + wp->w_topfill; + else +#endif + wp->w_cline_row += plines_win(wp, lnum++, TRUE); + } + } + + check_cursor_moved(wp); + if (!(wp->w_valid & VALID_CHEIGHT)) + { + if (all_invalid + || i == wp->w_lines_valid + || (i < wp->w_lines_valid + && (!wp->w_lines[i].wl_valid + || wp->w_lines[i].wl_lnum != wp->w_cursor.lnum))) + { +#ifdef FEAT_DIFF + if (wp->w_cursor.lnum == wp->w_topline) + wp->w_cline_height = plines_win_nofill(wp, wp->w_cursor.lnum, + TRUE) + wp->w_topfill; + else +#endif + wp->w_cline_height = plines_win(wp, wp->w_cursor.lnum, TRUE); +#ifdef FEAT_FOLDING + wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum, + NULL, NULL, TRUE, NULL); +#endif + } + else if (i > wp->w_lines_valid) + { + /* a line that is too long to fit on the last screen line */ + wp->w_cline_height = 0; +#ifdef FEAT_FOLDING + wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum, + NULL, NULL, TRUE, NULL); +#endif + } + else + { + wp->w_cline_height = wp->w_lines[i].wl_size; +#ifdef FEAT_FOLDING + wp->w_cline_folded = wp->w_lines[i].wl_folded; +#endif + } + } + + wp->w_valid |= VALID_CROW|VALID_CHEIGHT; + + /* validate botline too, if update_screen doesn't do it */ + if (do_botline && all_invalid) + validate_botline_win(wp); +} + +/* + * Validate curwin->w_virtcol only. + */ + void +validate_virtcol() +{ + validate_virtcol_win(curwin); +} + +/* + * Validate wp->w_virtcol only. + */ + void +validate_virtcol_win(wp) + win_T *wp; +{ + check_cursor_moved(wp); + if (!(wp->w_valid & VALID_VIRTCOL)) + { + getvvcol(wp, &wp->w_cursor, NULL, &(wp->w_virtcol), NULL); + wp->w_valid |= VALID_VIRTCOL; + } +} + +/* + * Validate curwin->w_cline_height only. + */ + static void +validate_cheight() +{ + check_cursor_moved(curwin); + if (!(curwin->w_valid & VALID_CHEIGHT)) + { +#ifdef FEAT_DIFF + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_cline_height = plines_nofill(curwin->w_cursor.lnum) + + curwin->w_topfill; + else +#endif + curwin->w_cline_height = plines(curwin->w_cursor.lnum); +#ifdef FEAT_FOLDING + curwin->w_cline_folded = hasFolding(curwin->w_cursor.lnum, NULL, NULL); +#endif + curwin->w_valid |= VALID_CHEIGHT; + } +} + +/* + * validate w_wcol and w_virtcol only. Only correct when 'wrap' on! + */ + void +validate_cursor_col() +{ + colnr_T off; + colnr_T col; + + validate_virtcol(); + if (!(curwin->w_valid & VALID_WCOL)) + { + col = curwin->w_virtcol; + off = curwin_col_off(); + col += off; + + /* long line wrapping, adjust curwin->w_wrow */ + if (curwin->w_p_wrap && col >= (colnr_T)W_WIDTH(curwin) +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + col -= W_WIDTH(curwin); + col = col % (W_WIDTH(curwin) - off + curwin_col_off2()); + } + curwin->w_wcol = col; + curwin->w_valid |= VALID_WCOL; + } +} + +/* + * Compute offset of a window, occupied by line number, fold column and sign + * column (these don't move when scrolling horizontally). + */ + int +win_col_off(wp) + win_T *wp; +{ + return ((wp->w_p_nu ? 8 : 0) +#ifdef FEAT_CMDWIN + + (cmdwin_type == 0 || wp != curwin ? 0 : 1) +#endif +#ifdef FEAT_FOLDING + + wp->w_p_fdc +#endif +#ifdef FEAT_SIGNS + + ( +# ifdef FEAT_NETBEANS_INTG + /* always show glyph gutter in netbeans */ + usingNetbeans || +# endif + wp->w_buffer->b_signlist != NULL ? 2 : 0) +#endif + ); +} + + int +curwin_col_off() +{ + return win_col_off(curwin); +} + +/* + * Return the difference in column offset for the second screen line of a + * wrapped line. It's 8 if 'number' is on and 'n' is in 'cpoptions'. + */ + int +win_col_off2(wp) + win_T *wp; +{ + if (wp->w_p_nu && vim_strchr(p_cpo, CPO_NUMCOL) != NULL) + return 8; + return 0; +} + + int +curwin_col_off2() +{ + return win_col_off2(curwin); +} + +/* + * compute curwin->w_wcol and curwin->w_virtcol. + * Also updates curwin->w_wrow and curwin->w_cline_row. + * Also updates curwin->w_leftcol. + */ + void +curs_columns(scroll) + int scroll; /* when TRUE, may scroll horizontally */ +{ + int diff; + int extra; /* offset for first screen line */ + int off_left, off_right; + int n; + int p_lines; + int width = 0; + int textwidth; + int new_leftcol; + colnr_T startcol; + colnr_T endcol; + colnr_T prev_skipcol; + + /* + * First make sure that w_topline is valid (after moving the cursor). + */ + update_topline(); + + /* + * Next make sure that w_cline_row is valid. + */ + if (!(curwin->w_valid & VALID_CROW)) + curs_rows(curwin, FALSE); + + /* + * Compute the number of virtual columns. + */ +#ifdef FEAT_FOLDING + if (curwin->w_cline_folded) + /* In a folded line the cursor is always in the first column */ + startcol = curwin->w_virtcol = endcol = curwin->w_leftcol; + else +#endif + getvvcol(curwin, &curwin->w_cursor, + &startcol, &(curwin->w_virtcol), &endcol); + + /* remove '$' from change command when cursor moves onto it */ + if (startcol > dollar_vcol) + dollar_vcol = 0; + + extra = curwin_col_off(); + curwin->w_wcol = curwin->w_virtcol + extra; + endcol += extra; + + /* + * Now compute w_wrow, counting screen lines from w_cline_row. + */ + curwin->w_wrow = curwin->w_cline_row; + + textwidth = W_WIDTH(curwin) - extra; + if (textwidth <= 0) + { + /* No room for text, put cursor in last char of window. */ + curwin->w_wcol = W_WIDTH(curwin) - 1; + curwin->w_wrow = curwin->w_height - 1; + } + else if (curwin->w_p_wrap +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + width = textwidth + curwin_col_off2(); + + /* long line wrapping, adjust curwin->w_wrow */ + if (curwin->w_wcol >= W_WIDTH(curwin)) + { + n = (curwin->w_wcol - W_WIDTH(curwin)) / width + 1; + curwin->w_wcol -= n * width; + curwin->w_wrow += n; + +#ifdef FEAT_LINEBREAK + /* When cursor wraps to first char of next line in Insert + * mode, the 'showbreak' string isn't shown, backup to first + * column */ + if (*p_sbr && *ml_get_cursor() == NUL + && curwin->w_wcol == (int)vim_strsize(p_sbr)) + curwin->w_wcol = 0; +#endif + } + } + + /* No line wrapping: compute curwin->w_leftcol if scrolling is on and line + * is not folded. + * If scrolling is off, curwin->w_leftcol is assumed to be 0 */ + else if (scroll +#ifdef FEAT_FOLDING + && !curwin->w_cline_folded +#endif + ) + { + /* + * If Cursor is left of the screen, scroll rightwards. + * If Cursor is right of the screen, scroll leftwards + * If we get closer to the edge than 'sidescrolloff', scroll a little + * extra + */ + off_left = (int)startcol - (int)curwin->w_leftcol - p_siso; + off_right = (int)endcol - (int)(curwin->w_leftcol + W_WIDTH(curwin) + - p_siso) + 1; + if (off_left < 0 || off_right > 0) + { + if (off_left < 0) + diff = -off_left; + else + diff = off_right; + + /* When far off or not enough room on either side, put cursor in + * middle of window. */ + if (p_ss == 0 || diff >= textwidth / 2 || off_right >= off_left) + new_leftcol = curwin->w_wcol - extra - textwidth / 2; + else + { + if (diff < p_ss) + diff = p_ss; + if (off_left < 0) + new_leftcol = curwin->w_leftcol - diff; + else + new_leftcol = curwin->w_leftcol + diff; + } + if (new_leftcol < 0) + new_leftcol = 0; + if (new_leftcol != (int)curwin->w_leftcol) + { + curwin->w_leftcol = new_leftcol; + /* screen has to be redrawn with new curwin->w_leftcol */ + redraw_later(NOT_VALID); + } + } + curwin->w_wcol -= curwin->w_leftcol; + } + else if (curwin->w_wcol > (int)curwin->w_leftcol) + curwin->w_wcol -= curwin->w_leftcol; + else + curwin->w_wcol = 0; + +#ifdef FEAT_DIFF + /* Skip over filler lines. At the top use w_topfill, there + * may be some filler lines above the window. */ + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_wrow += curwin->w_topfill; + else + curwin->w_wrow += diff_check_fill(curwin, curwin->w_cursor.lnum); +#endif + + prev_skipcol = curwin->w_skipcol; + + p_lines = 0; + if ((curwin->w_wrow >= curwin->w_height + || ((prev_skipcol > 0 + || curwin->w_wrow + p_so >= curwin->w_height) + && (p_lines = +#ifdef FEAT_DIFF + plines_win_nofill +#else + plines_win +#endif + (curwin, curwin->w_cursor.lnum, FALSE)) + - 1 >= curwin->w_height)) + && curwin->w_height != 0 + && curwin->w_cursor.lnum == curwin->w_topline + && width > 0 +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + /* Cursor past end of screen. Happens with a single line that does + * not fit on screen. Find a skipcol to show the text around the + * cursor. Avoid scrolling all the time. compute value of "extra": + * 1: Less than "p_so" lines above + * 2: Less than "p_so" lines below + * 3: both of them */ + extra = 0; + if (curwin->w_skipcol + p_so * width > curwin->w_virtcol) + extra = 1; + /* Compute last display line of the buffer line that we want at the + * bottom of the window. */ + if (p_lines == 0) + p_lines = plines_win(curwin, curwin->w_cursor.lnum, FALSE); + --p_lines; + if (p_lines > curwin->w_wrow + p_so) + n = curwin->w_wrow + p_so; + else + n = p_lines; + if ((colnr_T)n >= curwin->w_height + curwin->w_skipcol / width) + extra += 2; + + if (extra == 3 || p_lines < p_so * 2) + { + /* not enough room for 'scrolloff', put cursor in the middle */ + n = curwin->w_virtcol / width; + if (n > curwin->w_height / 2) + n -= curwin->w_height / 2; + else + n = 0; + /* don't skip more than necessary */ + if (n > p_lines - curwin->w_height + 1) + n = p_lines - curwin->w_height + 1; + curwin->w_skipcol = n * width; + } + else if (extra == 1) + { + /* less then 'scrolloff' lines above, decrease skipcol */ + extra = (curwin->w_skipcol + p_so * width - curwin->w_virtcol + + width - 1) / width; + if (extra > 0) + { + if ((colnr_T)(extra * width) > curwin->w_skipcol) + extra = curwin->w_skipcol / width; + curwin->w_skipcol -= extra * width; + } + } + else if (extra == 2) + { + /* less then 'scrolloff' lines below, increase skipcol */ + endcol = (n - curwin->w_height + 1) * width; + while (endcol > curwin->w_virtcol) + endcol -= width; + if (endcol > curwin->w_skipcol) + curwin->w_skipcol = endcol; + } + + curwin->w_wrow -= curwin->w_skipcol / width; + if (curwin->w_wrow >= curwin->w_height) + { + /* small window, make sure cursor is in it */ + extra = curwin->w_wrow - curwin->w_height + 1; + curwin->w_skipcol += extra * width; + curwin->w_wrow -= extra; + } + + extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width; + if (extra > 0) + win_ins_lines(curwin, 0, extra, FALSE, FALSE); + else if (extra < 0) + win_del_lines(curwin, 0, -extra, FALSE, FALSE); + } + else + curwin->w_skipcol = 0; + if (prev_skipcol != curwin->w_skipcol) + redraw_later(NOT_VALID); + + curwin->w_valid |= VALID_WCOL|VALID_WROW|VALID_VIRTCOL; +} + +/* + * Scroll the current window down by "line_count" logical lines. "CTRL-Y" + */ +/*ARGSUSED*/ + void +scrolldown(line_count, byfold) + long line_count; + int byfold; /* TRUE: count a closed fold as one line */ +{ + long done = 0; /* total # of physical lines done */ + int wrow; + int moved = FALSE; + +#ifdef FEAT_FOLDING + linenr_T first; + + /* Make sure w_topline is at the first of a sequence of folded lines. */ + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + validate_cursor(); /* w_wrow needs to be valid */ + while (line_count-- > 0) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill < diff_check(curwin, curwin->w_topline)) + { + ++curwin->w_topfill; + ++done; + } + else +#endif + { + if (curwin->w_topline == 1) + break; + --curwin->w_topline; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif +#ifdef FEAT_FOLDING + /* A sequence of folded lines only counts for one logical line */ + if (hasFolding(curwin->w_topline, &first, NULL)) + { + ++done; + if (!byfold) + line_count -= curwin->w_topline - first - 1; + curwin->w_botline -= curwin->w_topline - first; + curwin->w_topline = first; + } + else +#endif +#ifdef FEAT_DIFF + done += plines_nofill(curwin->w_topline); +#else + done += plines(curwin->w_topline); +#endif + } + --curwin->w_botline; /* approximate w_botline */ + invalidate_botline(); + } + curwin->w_wrow += done; /* keep w_wrow updated */ + curwin->w_cline_row += done; /* keep w_cline_row updated */ + +#ifdef FEAT_DIFF + if (curwin->w_cursor.lnum == curwin->w_topline) + curwin->w_cline_row = 0; + check_topfill(curwin, TRUE); +#endif + + /* + * Compute the row number of the last row of the cursor line + * and move the cursor onto the displayed part of the window. + */ + wrow = curwin->w_wrow; + if (curwin->w_p_wrap +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + validate_virtcol(); + validate_cheight(); + wrow += curwin->w_cline_height - 1 - + curwin->w_virtcol / W_WIDTH(curwin); + } + while (wrow >= curwin->w_height && curwin->w_cursor.lnum > 1) + { +#ifdef FEAT_FOLDING + if (hasFolding(curwin->w_cursor.lnum, &first, NULL)) + { + --wrow; + if (first == 1) + curwin->w_cursor.lnum = 1; + else + curwin->w_cursor.lnum = first - 1; + } + else +#endif + wrow -= plines(curwin->w_cursor.lnum--); + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL); + moved = TRUE; + } + if (moved) + { +#ifdef FEAT_FOLDING + /* Move cursor to first line of closed fold. */ + foldAdjustCursor(); +#endif + coladvance(curwin->w_curswant); + } +} + +/* + * Scroll the current window up by "line_count" logical lines. "CTRL-E" + */ +/*ARGSUSED*/ + void +scrollup(line_count, byfold) + long line_count; + int byfold; /* TRUE: count a closed fold as one line */ +{ +#if defined(FEAT_FOLDING) || defined(FEAT_DIFF) + linenr_T lnum; + + if ( +# ifdef FEAT_FOLDING + (byfold && hasAnyFolding(curwin)) +# ifdef FEAT_DIFF + || +# endif +# endif +# ifdef FEAT_DIFF + curwin->w_p_diff +# endif + ) + { + /* count each sequence of folded lines as one logical line */ + lnum = curwin->w_topline; + while (line_count--) + { +# ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + --curwin->w_topfill; + else +# endif + { +# ifdef FEAT_FOLDING + if (byfold) + (void)hasFolding(lnum, NULL, &lnum); +# endif + if (lnum >= curbuf->b_ml.ml_line_count) + break; + ++lnum; +# ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, lnum); +# endif + } + } + /* approximate w_botline */ + curwin->w_botline += lnum - curwin->w_topline; + curwin->w_topline = lnum; + } + else +#endif + { + curwin->w_topline += line_count; + curwin->w_botline += line_count; /* approximate w_botline */ + } + + if (curwin->w_topline > curbuf->b_ml.ml_line_count) + curwin->w_topline = curbuf->b_ml.ml_line_count; + if (curwin->w_botline > curbuf->b_ml.ml_line_count + 1) + curwin->w_botline = curbuf->b_ml.ml_line_count + 1; + +#ifdef FEAT_DIFF + check_topfill(curwin, FALSE); +#endif + +#ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + /* Make sure w_topline is at the first of a sequence of folded lines. */ + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + if (curwin->w_cursor.lnum < curwin->w_topline) + { + curwin->w_cursor.lnum = curwin->w_topline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL); + coladvance(curwin->w_curswant); + } +} + +#ifdef FEAT_DIFF +/* + * Don't end up with too many filler lines in the window. + */ + void +check_topfill(wp, down) + win_T *wp; + int down; /* when TRUE scroll down when not enough space */ +{ + int n; + + if (wp->w_topfill > 0) + { + n = plines_win_nofill(wp, wp->w_topline, TRUE); + if (wp->w_topfill + n > wp->w_height) + { + if (down && wp->w_topline > 1) + { + --wp->w_topline; + wp->w_topfill = 0; + } + else + { + wp->w_topfill = wp->w_height - n; + if (wp->w_topfill < 0) + wp->w_topfill = 0; + } + } + } +} + +/* + * Use as many filler lines as possible for w_topline. Make sure w_topline + * is still visible. + */ + static void +max_topfill() +{ + int n; + + n = plines_nofill(curwin->w_topline); + if (n >= curwin->w_height) + curwin->w_topfill = 0; + else + { + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); + if (curwin->w_topfill + n > curwin->w_height) + curwin->w_topfill = curwin->w_height - n; + } +} +#endif + +#if defined(FEAT_INS_EXPAND) || defined(PROTO) +/* + * Scroll the screen one line down, but don't do it if it would move the + * cursor off the screen. + */ + void +scrolldown_clamp() +{ + int end_row; +#ifdef FEAT_DIFF + int can_fill = (curwin->w_topfill + < diff_check_fill(curwin, curwin->w_topline)); +#endif + + if (curwin->w_topline <= 1 +#ifdef FEAT_DIFF + && !can_fill +#endif + ) + return; + + validate_cursor(); /* w_wrow needs to be valid */ + + /* + * Compute the row number of the last row of the cursor line + * and make sure it doesn't go off the screen. Make sure the cursor + * doesn't go past 'scrolloff' lines from the screen end. + */ + end_row = curwin->w_wrow; +#ifdef FEAT_DIFF + if (can_fill) + ++end_row; + else + end_row += plines_nofill(curwin->w_topline - 1); +#else + end_row += plines(curwin->w_topline - 1); +#endif + if (curwin->w_p_wrap +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + validate_cheight(); + validate_virtcol(); + end_row += curwin->w_cline_height - 1 - + curwin->w_virtcol / W_WIDTH(curwin); + } + if (end_row < curwin->w_height - p_so) + { +#ifdef FEAT_DIFF + if (can_fill) + { + ++curwin->w_topfill; + check_topfill(curwin, TRUE); + } + else + { + --curwin->w_topline; + curwin->w_topfill = 0; + } +#else + --curwin->w_topline; +#endif +#ifdef FEAT_FOLDING + hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + --curwin->w_botline; /* approximate w_botline */ + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } +} + +/* + * Scroll the screen one line up, but don't do it if it would move the cursor + * off the screen. + */ + void +scrollup_clamp() +{ + int start_row; + + if (curwin->w_topline == curbuf->b_ml.ml_line_count +#ifdef FEAT_DIFF + && curwin->w_topfill == 0 +#endif + ) + return; + + validate_cursor(); /* w_wrow needs to be valid */ + + /* + * Compute the row number of the first row of the cursor line + * and make sure it doesn't go off the screen. Make sure the cursor + * doesn't go before 'scrolloff' lines from the screen start. + */ +#ifdef FEAT_DIFF + start_row = curwin->w_wrow - plines_nofill(curwin->w_topline) + - curwin->w_topfill; +#else + start_row = curwin->w_wrow - plines(curwin->w_topline); +#endif + if (curwin->w_p_wrap +#ifdef FEAT_VERTSPLIT + && curwin->w_width != 0 +#endif + ) + { + validate_virtcol(); + start_row -= curwin->w_virtcol / W_WIDTH(curwin); + } + if (start_row >= p_so) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + --curwin->w_topfill; + else +#endif + ++curwin->w_topline; + ++curwin->w_botline; /* approximate w_botline */ + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } +} +#endif /* FEAT_INS_EXPAND */ + +/* + * Add one line above "lp->lnum". This can be a filler line, a closed fold or + * a (wrapped) text line. Uses and sets "lp->fill". + * Returns the height of the added line in "lp->height". + * Lines above the first one are incredibly high. + */ + static void +topline_back(lp) + lineoff_T *lp; +{ +#ifdef FEAT_DIFF + if (lp->fill < diff_check_fill(curwin, lp->lnum)) + { + /* Add a filler line. */ + ++lp->fill; + lp->height = 1; + } + else +#endif + { + --lp->lnum; +#ifdef FEAT_DIFF + lp->fill = 0; +#endif + if (lp->lnum < 1) + lp->height = MAXCOL; + else +#ifdef FEAT_FOLDING + if (hasFolding(lp->lnum, &lp->lnum, NULL)) + /* Add a closed fold */ + lp->height = 1; + else +#endif + { +#ifdef FEAT_DIFF + lp->height = plines_nofill(lp->lnum); +#else + lp->height = plines(lp->lnum); +#endif + } + } +} + +/* + * Add one line below "lp->lnum". This can be a filler line, a closed fold or + * a (wrapped) text line. Uses and sets "lp->fill". + * Returns the height of the added line in "lp->height". + * Lines below the last one are incredibly high. + */ + static void +botline_forw(lp) + lineoff_T *lp; +{ +#ifdef FEAT_DIFF + if (lp->fill < diff_check_fill(curwin, lp->lnum + 1)) + { + /* Add a filler line. */ + ++lp->fill; + lp->height = 1; + } + else +#endif + { + ++lp->lnum; +#ifdef FEAT_DIFF + lp->fill = 0; +#endif + if (lp->lnum > curbuf->b_ml.ml_line_count) + lp->height = MAXCOL; + else +#ifdef FEAT_FOLDING + if (hasFolding(lp->lnum, NULL, &lp->lnum)) + /* Add a closed fold */ + lp->height = 1; + else +#endif + { +#ifdef FEAT_DIFF + lp->height = plines_nofill(lp->lnum); +#else + lp->height = plines(lp->lnum); +#endif + } + } +} + +#ifdef FEAT_DIFF +/* + * Switch from including filler lines below lp->lnum to including filler + * lines above loff.lnum + 1. This keeps pointing to the same line. + * When there are no filler lines nothing changes. + */ + static void +botline_topline(lp) + lineoff_T *lp; +{ + if (lp->fill > 0) + { + ++lp->lnum; + lp->fill = diff_check_fill(curwin, lp->lnum) - lp->fill + 1; + } +} + +/* + * Switch from including filler lines above lp->lnum to including filler + * lines below loff.lnum - 1. This keeps pointing to the same line. + * When there are no filler lines nothing changes. + */ + static void +topline_botline(lp) + lineoff_T *lp; +{ + if (lp->fill > 0) + { + lp->fill = diff_check_fill(curwin, lp->lnum) - lp->fill + 1; + --lp->lnum; + } +} +#endif + +/* + * Recompute topline to put the cursor at the top of the window. + * Scroll at least "min_scroll" lines. + * If "always" is TRUE, always set topline (for "zt"). + */ + void +scroll_cursor_top(min_scroll, always) + int min_scroll; + int always; +{ + int scrolled = 0; + int extra = 0; + int used; + int i; + linenr_T top; /* just above displayed lines */ + linenr_T bot; /* just below displayed lines */ + linenr_T old_topline = curwin->w_topline; +#ifdef FEAT_DIFF + linenr_T old_topfill = curwin->w_topfill; +#endif + linenr_T new_topline; + int off = p_so; + +#ifdef FEAT_MOUSE + if (mouse_dragging > 0) + off = mouse_dragging - 1; +#endif + + /* + * Decrease topline until: + * - it has become 1 + * - (part of) the cursor line is moved off the screen or + * - moved at least 'scrolljump' lines and + * - at least 'scrolloff' lines above and below the cursor + */ + validate_cheight(); + used = curwin->w_cline_height; + if (curwin->w_cursor.lnum < curwin->w_topline) + scrolled = used; + +#ifdef FEAT_FOLDING + if (hasFolding(curwin->w_cursor.lnum, &top, &bot)) + { + --top; + ++bot; + } + else +#endif + { + top = curwin->w_cursor.lnum - 1; + bot = curwin->w_cursor.lnum + 1; + } + new_topline = top + 1; + +#ifdef FEAT_DIFF + /* count filler lines of the cursor window as context */ + i = diff_check_fill(curwin, curwin->w_cursor.lnum); + used += i; + extra += i; +#endif + + /* + * Check if the lines from "top" to "bot" fit in the window. If they do, + * set new_topline and advance "top" and "bot" to include more lines. + */ + while (top > 0) + { +#ifdef FEAT_FOLDING + if (hasFolding(top, &top, NULL)) + /* count one logical line for a sequence of folded lines */ + i = 1; + else +#endif + i = plines(top); + used += i; + if (extra + i <= off && bot < curbuf->b_ml.ml_line_count) + { +#ifdef FEAT_FOLDING + if (hasFolding(bot, NULL, &bot)) + /* count one logical line for a sequence of folded lines */ + ++used; + else +#endif + used += plines(bot); + } + if (used > curwin->w_height) + break; + if (top < curwin->w_topline) + scrolled += i; + + /* + * If scrolling is needed, scroll at least 'sj' lines. + */ + if ((new_topline >= curwin->w_topline || scrolled > min_scroll) + && extra >= off) + break; + + extra += i; + new_topline = top; + --top; + ++bot; + } + + /* + * If we don't have enough space, put cursor in the middle. + * This makes sure we get the same position when using "k" and "j" + * in a small window. + */ + if (used > curwin->w_height) + scroll_cursor_halfway(FALSE); + else + { + /* + * If "always" is FALSE, only adjust topline to a lower value, higher + * value may happen with wrapping lines + */ + if (new_topline < curwin->w_topline || always) + curwin->w_topline = new_topline; + if (curwin->w_topline > curwin->w_cursor.lnum) + curwin->w_topline = curwin->w_cursor.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); + if (curwin->w_topfill > 0 && extra > off) + { + curwin->w_topfill -= extra - off; + if (curwin->w_topfill < 0) + curwin->w_topfill = 0; + } + check_topfill(curwin, FALSE); +#endif + if (curwin->w_topline != old_topline +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + ) + curwin->w_valid &= + ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + curwin->w_valid |= VALID_TOPLINE; + } +} + +/* + * Set w_empty_rows and w_filler_rows for window "wp", having used up "used" + * screen lines for text lines. + */ + void +set_empty_rows(wp, used) + win_T *wp; + int used; +{ +#ifdef FEAT_DIFF + wp->w_filler_rows = 0; +#endif + if (used == 0) + wp->w_empty_rows = 0; /* single line that doesn't fit */ + else + { + wp->w_empty_rows = wp->w_height - used; +#ifdef FEAT_DIFF + if (wp->w_botline <= wp->w_buffer->b_ml.ml_line_count) + { + wp->w_filler_rows = diff_check_fill(wp, wp->w_botline); + if (wp->w_empty_rows > wp->w_filler_rows) + wp->w_empty_rows -= wp->w_filler_rows; + else + { + wp->w_filler_rows = wp->w_empty_rows; + wp->w_empty_rows = 0; + } + } +#endif + } +} + +/* + * Recompute topline to put the cursor at the bottom of the window. + * Scroll at least "min_scroll" lines. + * If "set_topbot" is TRUE, set topline and botline first (for "zb"). + * This is messy stuff!!! + */ + void +scroll_cursor_bot(min_scroll, set_topbot) + int min_scroll; + int set_topbot; +{ + int used; + int scrolled = 0; + int extra = 0; + int i; + linenr_T line_count; + linenr_T old_topline = curwin->w_topline; + lineoff_T loff; + lineoff_T boff; +#ifdef FEAT_DIFF + int old_topfill = curwin->w_topfill; + int fill_below_window; +#endif + linenr_T old_botline = curwin->w_botline; + linenr_T old_valid = curwin->w_valid; + int old_empty_rows = curwin->w_empty_rows; + linenr_T cln; /* Cursor Line Number */ + + cln = curwin->w_cursor.lnum; + if (set_topbot) + { + used = 0; + curwin->w_botline = cln + 1; +#ifdef FEAT_DIFF + loff.fill = 0; +#endif + for (curwin->w_topline = curwin->w_botline; + curwin->w_topline > 1; + curwin->w_topline = loff.lnum) + { + loff.lnum = curwin->w_topline; + topline_back(&loff); + if (used + loff.height > curwin->w_height) + break; + used += loff.height; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; +#endif + } + set_empty_rows(curwin, used); + curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP; + if (curwin->w_topline != old_topline +#ifdef FEAT_DIFF + || curwin->w_topfill != old_topfill +#endif + ) + curwin->w_valid &= ~(VALID_WROW|VALID_CROW); + } + else + validate_botline(); + + /* The lines of the cursor line itself are always used. */ +#ifdef FEAT_DIFF + used = plines_nofill(cln); +#else + validate_cheight(); + used = curwin->w_cline_height; +#endif + + /* If the cursor is below botline, we will at least scroll by the height + * of the cursor line. Correct for empty lines, which are really part of + * botline. */ + if (cln >= curwin->w_botline) + { + scrolled = used; + if (cln == curwin->w_botline) + scrolled -= curwin->w_empty_rows; + } + + /* + * Stop counting lines to scroll when + * - hitting start of the file + * - scrolled nothing or at least 'sj' lines + * - at least 'so' lines below the cursor + * - lines between botline and cursor have been counted + */ +#ifdef FEAT_FOLDING + if (!hasFolding(curwin->w_cursor.lnum, &loff.lnum, &boff.lnum)) +#endif + { + loff.lnum = cln; + boff.lnum = cln; + } +#ifdef FEAT_DIFF + loff.fill = 0; + boff.fill = 0; + fill_below_window = diff_check_fill(curwin, curwin->w_botline) + - curwin->w_filler_rows; +#endif + + while (loff.lnum > 1) + { + /* Stop when scrolled nothing or at least "min_scroll", found "extra" + * context for 'scrolloff' and counted all lines below the window. */ + if ((((scrolled <= 0 || scrolled >= min_scroll) + && extra >= ( +#ifdef FEAT_MOUSE + mouse_dragging ? mouse_dragging - 1 : +#endif + p_so)) + || boff.lnum + 1 > curbuf->b_ml.ml_line_count) + && loff.lnum <= curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum < curwin->w_botline + || loff.fill >= fill_below_window) +#endif + ) + break; + + /* Add one line above */ + topline_back(&loff); + used += loff.height; + if (used > curwin->w_height) + break; + if (loff.lnum >= curwin->w_botline +#ifdef FEAT_DIFF + && (loff.lnum > curwin->w_botline + || loff.fill <= fill_below_window) +#endif + ) + { + /* Count screen lines that are below the window. */ + scrolled += loff.height; + if (loff.lnum == curwin->w_botline +#ifdef FEAT_DIFF + && boff.fill == 0 +#endif + ) + scrolled -= curwin->w_empty_rows; + } + + if (boff.lnum < curbuf->b_ml.ml_line_count) + { + /* Add one line below */ + botline_forw(&boff); + used += boff.height; + if (used > curwin->w_height) + break; + if (extra < ( +#ifdef FEAT_MOUSE + mouse_dragging > 0 ? mouse_dragging - 1 : +#endif + p_so) || scrolled < min_scroll) + { + extra += boff.height; + if (boff.lnum >= curwin->w_botline +#ifdef FEAT_DIFF + || (boff.lnum + 1 == curwin->w_botline + && boff.fill > curwin->w_filler_rows) +#endif + ) + { + /* Count screen lines that are below the window. */ + scrolled += boff.height; + if (boff.lnum == curwin->w_botline +#ifdef FEAT_DIFF + && boff.fill == 0 +#endif + ) + scrolled -= curwin->w_empty_rows; + } + } + } + } + + /* curwin->w_empty_rows is larger, no need to scroll */ + if (scrolled <= 0) + line_count = 0; + /* more than a screenfull, don't scroll but redraw */ + else if (used > curwin->w_height) + line_count = used; + /* scroll minimal number of lines */ + else + { + line_count = 0; +#ifdef FEAT_DIFF + boff.fill = curwin->w_topfill; +#endif + boff.lnum = curwin->w_topline - 1; + for (i = 0; i < scrolled && boff.lnum < curwin->w_botline; ) + { + botline_forw(&boff); + i += boff.height; + ++line_count; + } + if (i < scrolled) /* below curwin->w_botline, don't scroll */ + line_count = 9999; + } + + /* + * Scroll up if the cursor is off the bottom of the screen a bit. + * Otherwise put it at 1/2 of the screen. + */ + if (line_count >= curwin->w_height && line_count > min_scroll) + scroll_cursor_halfway(FALSE); + else + scrollup(line_count, TRUE); + + /* + * If topline didn't change we need to restore w_botline and w_empty_rows + * (we changed them). + * If topline did change, update_screen() will set botline. + */ + if (curwin->w_topline == old_topline && set_topbot) + { + curwin->w_botline = old_botline; + curwin->w_empty_rows = old_empty_rows; + curwin->w_valid = old_valid; + } + curwin->w_valid |= VALID_TOPLINE; +} + +/* + * Recompute topline to put the cursor halfway the window + * If "atend" is TRUE, also put it halfway at the end of the file. + */ + void +scroll_cursor_halfway(atend) + int atend; +{ + int above = 0; + linenr_T topline; +#ifdef FEAT_DIFF + int topfill = 0; +#endif + int below = 0; + int used; + lineoff_T loff; + lineoff_T boff; + + loff.lnum = boff.lnum = curwin->w_cursor.lnum; +#ifdef FEAT_FOLDING + (void)hasFolding(loff.lnum, &loff.lnum, &boff.lnum); +#endif +#ifdef FEAT_DIFF + used = plines_nofill(loff.lnum); + loff.fill = 0; + boff.fill = 0; +#else + used = plines(loff.lnum); +#endif + topline = loff.lnum; + while (topline > 1) + { + if (below <= above) /* add a line below the cursor first */ + { + if (boff.lnum < curbuf->b_ml.ml_line_count) + { + botline_forw(&boff); + used += boff.height; + if (used > curwin->w_height) + break; + below += boff.height; + } + else + { + ++below; /* count a "~" line */ + if (atend) + ++used; + } + } + + if (below > above) /* add a line above the cursor */ + { + topline_back(&loff); + used += loff.height; + if (used > curwin->w_height) + break; + above += loff.height; + topline = loff.lnum; +#ifdef FEAT_DIFF + topfill = loff.fill; +#endif + } + } +#ifdef FEAT_FOLDING + if (!hasFolding(topline, &curwin->w_topline, NULL)) +#endif + curwin->w_topline = topline; +#ifdef FEAT_DIFF + curwin->w_topfill = topfill; + check_topfill(curwin, FALSE); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + curwin->w_valid |= VALID_TOPLINE; +} + +/* + * Correct the cursor position so that it is in a part of the screen at least + * 'so' lines from the top and bottom, if possible. + * If not possible, put it at the same position as scroll_cursor_halfway(). + * When called topline must be valid! + */ + void +cursor_correct() +{ + int above = 0; /* screen lines above topline */ + linenr_T topline; + int below = 0; /* screen lines below botline */ + linenr_T botline; + int above_wanted, below_wanted; + linenr_T cln; /* Cursor Line Number */ + int max_off; + + /* + * How many lines we would like to have above/below the cursor depends on + * whether the first/last line of the file is on screen. + */ + above_wanted = p_so; + below_wanted = p_so; +#ifdef FEAT_MOUSE + if (mouse_dragging) + { + above_wanted = mouse_dragging - 1; + below_wanted = mouse_dragging - 1; + } +#endif + if (curwin->w_topline == 1) + { + above_wanted = 0; + max_off = curwin->w_height / 2; + if (below_wanted > max_off) + below_wanted = max_off; + } + validate_botline(); + if (curwin->w_botline == curbuf->b_ml.ml_line_count + 1 +#ifdef FEAT_MOUSE + && !mouse_dragging +#endif + ) + { + below_wanted = 0; + max_off = (curwin->w_height - 1) / 2; + if (above_wanted > max_off) + above_wanted = max_off; + } + + /* + * If there are sufficient file-lines above and below the cursor, we can + * return now. + */ + cln = curwin->w_cursor.lnum; + if (cln >= curwin->w_topline + above_wanted + && cln < curwin->w_botline - below_wanted +#ifdef FEAT_FOLDING + && !hasAnyFolding(curwin) +#endif + ) + return; + + /* + * Narrow down the area where the cursor can be put by taking lines from + * the top and the bottom until: + * - the desired context lines are found + * - the lines from the top is past the lines from the bottom + */ + topline = curwin->w_topline; + botline = curwin->w_botline - 1; +#ifdef FEAT_DIFF + /* count filler lines as context */ + above = curwin->w_topfill; + below = curwin->w_filler_rows; +#endif + while ((above < above_wanted || below < below_wanted) && topline < botline) + { + if (below < below_wanted && (below <= above || above >= above_wanted)) + { +#ifdef FEAT_FOLDING + if (hasFolding(botline, &botline, NULL)) + ++below; + else +#endif + below += plines(botline); + --botline; + } + if (above < above_wanted && (above < below || below >= below_wanted)) + { +#ifdef FEAT_FOLDING + if (hasFolding(topline, NULL, &topline)) + ++above; + else +#endif +#ifndef FEAT_DIFF + above += plines(topline); +#else + above += plines_nofill(topline); + + /* Count filler lines below this line as context. */ + if (topline < botline) + above += diff_check_fill(curwin, topline + 1); +#endif + ++topline; + } + } + if (topline == botline || botline == 0) + curwin->w_cursor.lnum = topline; + else if (topline > botline) + curwin->w_cursor.lnum = botline; + else + { + if (cln < topline && curwin->w_topline > 1) + { + curwin->w_cursor.lnum = topline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW); + } + if (cln > botline && curwin->w_botline <= curbuf->b_ml.ml_line_count) + { + curwin->w_cursor.lnum = botline; + curwin->w_valid &= + ~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW); + } + } + curwin->w_valid |= VALID_TOPLINE; +} + +static void get_scroll_overlap __ARGS((lineoff_T *lp, int dir)); + +/* + * move screen 'count' pages up or down and update screen + * + * return FAIL for failure, OK otherwise + */ + int +onepage(dir, count) + int dir; + long count; +{ + long n; + int retval = OK; + lineoff_T loff; + linenr_T old_topline = curwin->w_topline; + + if (curbuf->b_ml.ml_line_count == 1) /* nothing to do */ + { + beep_flush(); + return FAIL; + } + + for ( ; count > 0; --count) + { + validate_botline(); + /* + * It's an error to move a page up when the first line is already on + * the screen. It's an error to move a page down when the last line + * is on the screen and the topline is 'scrolloff' lines from the + * last line. + */ + if (dir == FORWARD + ? ((curwin->w_topline >= curbuf->b_ml.ml_line_count - p_so) + && curwin->w_botline > curbuf->b_ml.ml_line_count) + : (curwin->w_topline == 1 +#ifdef FEAT_DIFF + && curwin->w_topfill == + diff_check_fill(curwin, curwin->w_topline) +#endif + )) + { + beep_flush(); + retval = FAIL; + break; + } + +#ifdef FEAT_DIFF + loff.fill = 0; +#endif + if (dir == FORWARD) + { + /* at end of file */ + if (curwin->w_botline > curbuf->b_ml.ml_line_count) + { + curwin->w_topline = curbuf->b_ml.ml_line_count; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW); + } + else + { + /* For the overlap, start with the line just below the window + * and go upwards. */ + loff.lnum = curwin->w_botline; +#ifdef FEAT_DIFF + loff.fill = diff_check_fill(curwin, loff.lnum) + - curwin->w_filler_rows; +#endif + get_scroll_overlap(&loff, -1); + curwin->w_topline = loff.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; + check_topfill(curwin, FALSE); +#endif + curwin->w_cursor.lnum = curwin->w_topline; + curwin->w_valid &= ~(VALID_WCOL|VALID_CHEIGHT|VALID_WROW| + VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP); + } + } + else /* dir == BACKWARDS */ + { +#ifdef FEAT_DIFF + if (curwin->w_topline == 1) + { + /* Include max number of filler lines */ + max_topfill(); + continue; + } +#endif + /* Find the line at the top of the window that is going to be the + * line at the bottom of the window. Make sure this results in + * the same line as before doing CTRL-F. */ + loff.lnum = curwin->w_topline - 1; +#ifdef FEAT_DIFF + loff.fill = diff_check_fill(curwin, loff.lnum + 1) + - curwin->w_topfill; +#endif + get_scroll_overlap(&loff, 1); + + if (loff.lnum >= curbuf->b_ml.ml_line_count) + { + loff.lnum = curbuf->b_ml.ml_line_count; +#ifdef FEAT_DIFF + loff.fill = 0; + } + else + { + botline_topline(&loff); +#endif + } + curwin->w_cursor.lnum = loff.lnum; + + /* Find the line just above the new topline to get the right line + * at the bottom of the window. */ + n = 0; + while (n <= curwin->w_height && loff.lnum >= 1) + { + topline_back(&loff); + n += loff.height; + } + if (n <= curwin->w_height) /* at begin of file */ + { + curwin->w_topline = 1; +#ifdef FEAT_DIFF + max_topfill(); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } + else + { + /* Go two lines forward again. */ +#ifdef FEAT_DIFF + topline_botline(&loff); +#endif + botline_forw(&loff); + botline_forw(&loff); +#ifdef FEAT_DIFF + botline_topline(&loff); +#endif +#ifdef FEAT_FOLDING + /* We're at the wrong end of a fold now. */ + (void)hasFolding(loff.lnum, &loff.lnum, NULL); +#endif + + /* Always scroll at least one line. Avoid getting stuck on + * very long lines. */ + if (loff.lnum >= curwin->w_topline +#ifdef FEAT_DIFF + && (loff.lnum > curwin->w_topline + || loff.fill >= curwin->w_topfill) +#endif + ) + { +#ifdef FEAT_DIFF + /* First try using the maximum number of filler lines. If + * that's not enough, backup one line. */ + loff.fill = curwin->w_topfill; + if (curwin->w_topfill < diff_check_fill(curwin, + curwin->w_topline)) + max_topfill(); + if (curwin->w_topfill == loff.fill) +#endif + { + --curwin->w_topline; +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + } + comp_botline(curwin); + curwin->w_cursor.lnum = curwin->w_botline - 1; + curwin->w_valid &= ~(VALID_WCOL|VALID_CHEIGHT| + VALID_WROW|VALID_CROW); + } + else + { + curwin->w_topline = loff.lnum; +#ifdef FEAT_DIFF + curwin->w_topfill = loff.fill; + check_topfill(curwin, FALSE); +#endif + curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE); + } + } + } + } +#ifdef FEAT_FOLDING + foldAdjustCursor(); +#endif + cursor_correct(); + beginline(BL_SOL | BL_FIX); + curwin->w_valid &= ~(VALID_WCOL|VALID_WROW|VALID_VIRTCOL); + + /* + * Avoid the screen jumping up and down when 'scrolloff' is non-zero. + * But make sure we scroll at least one line (happens with mix of long + * wrapping lines and non-wrapping line). + */ + if (retval == OK && dir == FORWARD && check_top_offset()) + { + scroll_cursor_top(1, FALSE); + if (curwin->w_topline <= old_topline + && old_topline < curbuf->b_ml.ml_line_count) + { + curwin->w_topline = old_topline + 1; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif + } + } + + redraw_later(VALID); + return retval; +} + +/* + * Decide how much overlap to use for page-up or page-down scrolling. + * This is symmetric, so that doing both keeps the same lines displayed. + * Three lines are examined: + * + * before CTRL-F after CTRL-F / before CTRL-B + * etc. l1 + * l1 last but one line ------------ + * l2 last text line l2 top text line + * ------------- l3 second text line + * l3 etc. + */ + static void +get_scroll_overlap(lp, dir) + lineoff_T *lp; + int dir; +{ + int h1, h2, h3, h4; + int min_height = curwin->w_height - 2; + lineoff_T loff0, loff1, loff2; + +#ifdef FEAT_DIFF + if (lp->fill > 0) + lp->height = 1; + else + lp->height = plines_nofill(lp->lnum); +#else + lp->height = plines(lp->lnum); +#endif + h1 = lp->height; + if (h1 > min_height) + return; /* no overlap */ + + loff0 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h2 = lp->height; + if (h2 + h1 > min_height) + { + *lp = loff0; /* no overlap */ + return; + } + + loff1 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h3 = lp->height; + if (h3 + h2 > min_height) + { + *lp = loff0; /* no overlap */ + return; + } + + loff2 = *lp; + if (dir > 0) + botline_forw(lp); + else + topline_back(lp); + h4 = lp->height; + if (h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height) + *lp = loff1; /* 1 line overlap */ + else + *lp = loff2; /* 2 lines overlap */ + return; +} + +/* #define KEEP_SCREEN_LINE */ +/* + * Scroll 'scroll' lines up or down. + */ + void +halfpage(flag, Prenum) + int flag; + linenr_T Prenum; +{ + long scrolled = 0; + int i; + int n; + int room; + + if (Prenum) + curwin->w_p_scr = (Prenum > curwin->w_height) ? + curwin->w_height : Prenum; + n = (curwin->w_p_scr <= curwin->w_height) ? + curwin->w_p_scr : curwin->w_height; + + validate_botline(); + room = curwin->w_empty_rows; +#ifdef FEAT_DIFF + room += curwin->w_filler_rows; +#endif + if (flag) + { + /* + * scroll the text up + */ + while (n > 0 && curwin->w_botline <= curbuf->b_ml.ml_line_count) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill > 0) + { + i = 1; + if (--n < 0 && scrolled > 0) + break; + --curwin->w_topfill; + } + else +#endif + { +#ifdef FEAT_DIFF + i = plines_nofill(curwin->w_topline); +#else + i = plines(curwin->w_topline); +#endif + n -= i; + if (n < 0 && scrolled > 0) + break; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline); +#endif + ++curwin->w_topline; +#ifdef FEAT_DIFF + curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline); +#endif + +#ifndef KEEP_SCREEN_LINE + if (curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + { + ++curwin->w_cursor.lnum; + curwin->w_valid &= + ~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL); + } +#endif + } + curwin->w_valid &= ~(VALID_CROW|VALID_WROW); + scrolled += i; + + /* + * Correct w_botline for changed w_topline. + * Won't work when there are filler lines. + */ +#ifdef FEAT_DIFF + if (curwin->w_p_diff) + curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP); + else +#endif + { + room += i; + do + { + i = plines(curwin->w_botline); + if (i > room) + break; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_botline, NULL, + &curwin->w_botline); +#endif + ++curwin->w_botline; + room -= i; + } while (curwin->w_botline <= curbuf->b_ml.ml_line_count); + } + } + +#ifndef KEEP_SCREEN_LINE + /* + * When hit bottom of the file: move cursor down. + */ + if (n > 0) + { +# ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + while (--n >= 0 + && curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) + { + (void)hasFolding(curwin->w_cursor.lnum, NULL, + &curwin->w_cursor.lnum); + ++curwin->w_cursor.lnum; + } + } + else +# endif + curwin->w_cursor.lnum += n; + check_cursor_lnum(); + } +#else + /* try to put the cursor in the same screen line */ + while ((curwin->w_cursor.lnum < curwin->w_topline || scrolled > 0) + && curwin->w_cursor.lnum < curwin->w_botline - 1) + { + scrolled -= plines(curwin->w_cursor.lnum); + if (scrolled < 0 && curwin->w_cursor.lnum >= curwin->w_topline) + break; +# ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_cursor.lnum, NULL, + &curwin->w_cursor.lnum); +# endif + ++curwin->w_cursor.lnum; + } +#endif + } + else + { + /* + * scroll the text down + */ + while (n > 0 && curwin->w_topline > 1) + { +#ifdef FEAT_DIFF + if (curwin->w_topfill < diff_check_fill(curwin, curwin->w_topline)) + { + i = 1; + if (--n < 0 && scrolled > 0) + break; + ++curwin->w_topfill; + } + else +#endif + { +#ifdef FEAT_DIFF + i = plines_nofill(curwin->w_topline - 1); +#else + i = plines(curwin->w_topline - 1); +#endif + n -= i; + if (n < 0 && scrolled > 0) + break; + --curwin->w_topline; +#ifdef FEAT_FOLDING + (void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL); +#endif +#ifdef FEAT_DIFF + curwin->w_topfill = 0; +#endif + } + curwin->w_valid &= ~(VALID_CROW|VALID_WROW| + VALID_BOTLINE|VALID_BOTLINE_AP); + scrolled += i; +#ifndef KEEP_SCREEN_LINE + if (curwin->w_cursor.lnum > 1) + { + --curwin->w_cursor.lnum; + curwin->w_valid &= ~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL); + } +#endif + } +#ifndef KEEP_SCREEN_LINE + /* + * When hit top of the file: move cursor up. + */ + if (n > 0) + { + if (curwin->w_cursor.lnum <= (linenr_T)n) + curwin->w_cursor.lnum = 1; + else +# ifdef FEAT_FOLDING + if (hasAnyFolding(curwin)) + { + while (--n >= 0 && curwin->w_cursor.lnum > 1) + { + --curwin->w_cursor.lnum; + (void)hasFolding(curwin->w_cursor.lnum, + &curwin->w_cursor.lnum, NULL); + } + } + else +# endif + curwin->w_cursor.lnum -= n; + } +#else + /* try to put the cursor in the same screen line */ + scrolled += n; /* move cursor when topline is 1 */ + while (curwin->w_cursor.lnum > curwin->w_topline + && (scrolled > 0 || curwin->w_cursor.lnum >= curwin->w_botline)) + { + scrolled -= plines(curwin->w_cursor.lnum - 1); + if (scrolled < 0 && curwin->w_cursor.lnum < curwin->w_botline) + break; + --curwin->w_cursor.lnum; +# ifdef FEAT_FOLDING + foldAdjustCursor(); +# endif + } +#endif + } +# ifdef FEAT_FOLDING + /* Move cursor to first line of closed fold. */ + foldAdjustCursor(); +# endif +#ifdef FEAT_DIFF + check_topfill(curwin, !flag); +#endif + cursor_correct(); + beginline(BL_SOL | BL_FIX); + redraw_later(VALID); +} |