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44be2dfca192db9f47d59c6bb29975c9730c5827
neovim/src/nvim/move.c
Jan Edmund Lazo e2504d2192 vim-patch:8.1.0806: too many #ifdefs 
Problem:    Too many #ifdefs.
Solution:   Graduate FEAT_MBYTE, part 2.
fc3abf47fb
2020-11-12 01:12:58 -05:00

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
/*
* 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 <assert.h>
#include <inttypes.h>
#include <stdbool.h>
#include "nvim/ascii.h"
#include "nvim/move.h"
#include "nvim/charset.h"
#include "nvim/cursor.h"
#include "nvim/diff.h"
#include "nvim/edit.h"
#include "nvim/fold.h"
#include "nvim/mbyte.h"
#include "nvim/memline.h"
#include "nvim/misc1.h"
#include "nvim/option.h"
#include "nvim/popupmnu.h"
#include "nvim/screen.h"
#include "nvim/strings.h"
#include "nvim/window.h"
typedef struct {
linenr_T lnum; /* line number */
int fill; /* filler lines */
int height; /* height of added line */
} lineoff_T;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "move.c.generated.h"
#endif
/*
* Compute wp->w_botline for the current wp->w_topline. Can be called after
* wp->w_topline changed.
*/
static void comp_botline(win_T *wp)
{
linenr_T lnum;
int done;
/*
* 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++) {
linenr_T last = lnum;
bool folded;
int n = plines_win_full(wp, lnum, &last, &folded, true);
if (lnum <= wp->w_cursor.lnum && last >= wp->w_cursor.lnum) {
wp->w_cline_row = done;
wp->w_cline_height = n;
wp->w_cline_folded = folded;
redraw_for_cursorline(wp);
wp->w_valid |= (VALID_CROW|VALID_CHEIGHT);
}
if (done + n > wp->w_height_inner) {
break;
}
done += n;
lnum = last;
}
/* wp->w_botline is the line that is just below the window */
wp->w_botline = lnum;
wp->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
wp->w_viewport_invalid = true;
set_empty_rows(wp, done);
win_check_anchored_floats(wp);
}
void reset_cursorline(void)
{
curwin->w_last_cursorline = 0;
}
// Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is set.
void redraw_for_cursorline(win_T *wp)
FUNC_ATTR_NONNULL_ALL
{
if ((wp->w_p_rnu || win_cursorline_standout(wp))
&& (wp->w_valid & VALID_CROW) == 0
&& !pum_visible()) {
if (wp->w_p_rnu) {
// win_line() will redraw the number column only.
redraw_later(wp, VALID);
}
if (win_cursorline_standout(wp)) {
if (wp->w_redr_type <= VALID && wp->w_last_cursorline != 0) {
// "w_last_cursorline" may be outdated, worst case we redraw
// too much. This is optimized for moving the cursor around in
// the current window.
redrawWinline(wp, wp->w_last_cursorline);
redrawWinline(wp, wp->w_cursor.lnum);
} else {
redraw_later(wp, SOME_VALID);
}
}
}
}
/*
* Update curwin->w_topline and redraw if necessary.
* Used to update the screen before printing a message.
*/
void update_topline_redraw(void)
{
update_topline();
if (must_redraw)
update_screen(0);
}
/*
* Update curwin->w_topline to move the cursor onto the screen.
*/
void update_topline(void)
{
linenr_T old_topline;
int old_topfill;
bool check_topline = false;
bool check_botline = false;
long *so_ptr = curwin->w_p_so >= 0 ? &curwin->w_p_so : &p_so;
long save_so = *so_ptr;
// If there is no valid screen and when the window height is zero just use
// the cursor line.
if (!default_grid.chars || curwin->w_height_inner == 0) {
curwin->w_topline = curwin->w_cursor.lnum;
curwin->w_botline = curwin->w_topline;
curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
curwin->w_viewport_invalid = true;
curwin->w_scbind_pos = 1;
return;
}
check_cursor_moved(curwin);
if (curwin->w_valid & VALID_TOPLINE)
return;
// When dragging with the mouse, don't scroll that quickly
if (mouse_dragging > 0) {
*so_ptr = mouse_dragging - 1;
}
old_topline = curwin->w_topline;
old_topfill = curwin->w_topfill;
// If the buffer is empty, always set topline to 1.
if (BUFEMPTY()) { // special case - file is empty
if (curwin->w_topline != 1) {
redraw_later(curwin, NOT_VALID);
}
curwin->w_topline = 1;
curwin->w_botline = 2;
curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
curwin->w_viewport_invalid = true;
curwin->w_scbind_pos = 1;
}
/*
* 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;
}
/* 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;
if (check_topline) {
int halfheight = curwin->w_height_inner / 2 - 1;
if (halfheight < 2) {
halfheight = 2;
}
long n;
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 (linenr_T lnum = curwin->w_cursor.lnum;
lnum < curwin->w_topline + *so_ptr; 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 {
n = curwin->w_topline + *so_ptr - 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(scrolljump_value(), false);
check_botline = true;
}
} else {
/* Make sure topline is the first line of a fold. */
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
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) {
if (((long)curwin->w_cursor.lnum
>= (long)curwin->w_botline - *so_ptr
|| hasAnyFolding(curwin)
)) {
lineoff_T loff;
/* Cursor is (a few lines) above botline, check if there are
* 'scrolloff' window lines below the cursor. If not, need to
* scroll. */
int n = curwin->w_empty_rows;
loff.lnum = curwin->w_cursor.lnum;
/* In a fold go to its last line. */
(void)hasFolding(loff.lnum, NULL, &loff.lnum);
loff.fill = 0;
n += curwin->w_filler_rows;
loff.height = 0;
while (loff.lnum < curwin->w_botline
&& (loff.lnum + 1 < curwin->w_botline || loff.fill == 0)
) {
n += loff.height;
if (n >= *so_ptr) {
break;
}
botline_forw(&loff);
}
if (n >= *so_ptr) {
// sufficient context, no need to scroll
check_botline = false;
}
} else {
/* sufficient context, no need to scroll */
check_botline = false;
}
}
if (check_botline) {
long line_count = 0;
if (hasAnyFolding(curwin)) {
/* Count the number of logical lines between the cursor and
* botline - p_so (approximation of how much will be
* scrolled). */
for (linenr_T lnum = curwin->w_cursor.lnum;
lnum >= curwin->w_botline - *so_ptr; lnum--) {
line_count++;
// stop at end of file or when we know we are far off
if (lnum <= 0 || line_count > curwin->w_height_inner + 1) {
break;
}
(void)hasFolding(lnum, &lnum, NULL);
}
} else
line_count = curwin->w_cursor.lnum - curwin->w_botline
+ 1 + *so_ptr;
if (line_count <= curwin->w_height_inner + 1) {
scroll_cursor_bot(scrolljump_value(), false);
} else {
scroll_cursor_halfway(false);
}
}
}
}
curwin->w_valid |= VALID_TOPLINE;
curwin->w_viewport_invalid = true;
win_check_anchored_floats(curwin);
/*
* Need to redraw when topline changed.
*/
if (curwin->w_topline != old_topline
|| curwin->w_topfill != old_topfill
) {
dollar_vcol = -1;
if (curwin->w_skipcol != 0) {
curwin->w_skipcol = 0;
redraw_later(curwin, NOT_VALID);
} else {
redraw_later(curwin, VALID);
}
// May need to set w_skipcol when cursor in w_topline.
if (curwin->w_cursor.lnum == curwin->w_topline) {
validate_cursor();
}
}
*so_ptr = save_so;
}
/*
* Update win->w_topline to move the cursor onto the screen.
*/
void update_topline_win(win_T* win)
{
win_T *save_curwin;
switch_win(&save_curwin, NULL, win, NULL, true);
update_topline();
restore_win(save_curwin, NULL, true);
}
/*
* Return the scrolljump value to use for the current window.
* When 'scrolljump' is positive use it as-is.
* When 'scrolljump' is negative use it as a percentage of the window height.
*/
static int scrolljump_value(void)
{
long result = p_sj >= 0 ? p_sj : (curwin->w_height_inner * -p_sj) / 100;
assert(result <= INT_MAX);
return (int)result;
}
/*
* Return true when there are not 'scrolloff' lines above the cursor for the
* current window.
*/
static bool check_top_offset(void)
{
long so = get_scrolloff_value();
if (curwin->w_cursor.lnum < curwin->w_topline + so
|| hasAnyFolding(curwin)
) {
lineoff_T loff;
loff.lnum = curwin->w_cursor.lnum;
loff.fill = 0;
int n = curwin->w_topfill; // always have this context
// Count the visible screen lines above the cursor line.
while (n < so) {
topline_back(&loff);
// Stop when included a line above the window.
if (loff.lnum < curwin->w_topline
|| (loff.lnum == curwin->w_topline && loff.fill > 0)
) {
break;
}
n += loff.height;
}
if (n < so) {
return true;
}
}
return false;
}
void update_curswant(void)
{
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(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;
wp->w_viewport_invalid = true;
} else if (wp->w_cursor.col != wp->w_valid_cursor.col
|| wp->w_leftcol != wp->w_valid_leftcol
|| wp->w_cursor.coladd != wp->w_valid_cursor.coladd
) {
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;
wp->w_valid_cursor.coladd = wp->w_cursor.coladd;
wp->w_viewport_invalid = true;
}
}
/*
* 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(void)
{
changed_window_setting_win(curwin);
}
void changed_window_setting_win(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_later(wp, NOT_VALID);
}
/*
* Set wp->w_topline to a certain number.
*/
void set_topline(win_T *wp, linenr_T lnum)
{
/* go to first of folded lines */
(void)hasFoldingWin(wp, lnum, &lnum, NULL, true, NULL);
/* Approximate the value of w_botline */
wp->w_botline += lnum - wp->w_topline;
wp->w_topline = lnum;
wp->w_topline_was_set = true;
wp->w_topfill = 0;
wp->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_TOPLINE);
// Don't set VALID_TOPLINE here, 'scrolloff' needs to be checked.
redraw_later(wp, 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(void)
{
curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
|VALID_CHEIGHT|VALID_TOPLINE);
}
void changed_cline_bef_curs_win(win_T *wp)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
|VALID_CHEIGHT|VALID_TOPLINE);
}
/*
* 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(void)
{
curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
|VALID_CHEIGHT|VALID_TOPLINE);
}
void changed_line_abv_curs_win(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(void)
{
if (!(curwin->w_valid & VALID_BOTLINE))
comp_botline(curwin);
}
/*
* Mark curwin->w_botline as invalid (because of some change in the buffer).
*/
void invalidate_botline(void)
{
curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP);
}
void invalidate_botline_win(win_T *wp)
{
wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP);
}
void approximate_botline_win(win_T *wp)
{
wp->w_valid &= ~VALID_BOTLINE;
}
/*
* Return true if curwin->w_wrow and curwin->w_wcol are valid.
*/
int cursor_valid(void)
{
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(void)
{
check_cursor_moved(curwin);
if ((curwin->w_valid & (VALID_WCOL|VALID_WROW)) != (VALID_WCOL|VALID_WROW))
curs_columns(true);
}
/*
* Compute wp->w_cline_row and wp->w_cline_height, based on the current value
* of wp->w_topline.
*/
static void curs_rows(win_T *wp)
{
/* Check if wp->w_lines[].wl_size is invalid */
int all_invalid = (!redrawing()
|| wp->w_lines_valid == 0
|| wp->w_lines[0].wl_lnum > wp->w_topline);
int i = 0;
wp->w_cline_row = 0;
for (linenr_T lnum = wp->w_topline; lnum < wp->w_cursor.lnum; ++i) {
bool 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) {
/* 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)
valid = true;
} else if (wp->w_lines[i].wl_lnum > lnum) {
--i; /* hold at inserted lines */
}
}
if (valid
&& (lnum != wp->w_topline || !wp->w_p_diff)
) {
lnum = wp->w_lines[i].wl_lastlnum + 1;
/* Cursor inside folded lines, don't count this row */
if (lnum > wp->w_cursor.lnum)
break;
wp->w_cline_row += wp->w_lines[i].wl_size;
} else {
linenr_T last = lnum;
bool folded;
int n = plines_win_full(wp, lnum, &last, &folded, false);
lnum = last + 1;
if (folded && lnum > wp->w_cursor.lnum) {
break;
}
wp->w_cline_row += n;
}
}
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))) {
wp->w_cline_height = plines_win_full(wp, wp->w_cursor.lnum, NULL,
&wp->w_cline_folded, true);
} 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;
wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum, NULL,
NULL, true, NULL);
} else {
wp->w_cline_height = wp->w_lines[i].wl_size;
wp->w_cline_folded = wp->w_lines[i].wl_folded;
}
}
redraw_for_cursorline(curwin);
wp->w_valid |= VALID_CROW|VALID_CHEIGHT;
}
/*
* Validate curwin->w_virtcol only.
*/
void validate_virtcol(void)
{
validate_virtcol_win(curwin);
}
/*
* Validate wp->w_virtcol only.
*/
void validate_virtcol_win(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;
if (wp->w_p_cuc
&& !pum_visible()
)
redraw_later(wp, SOME_VALID);
}
}
/*
* Validate curwin->w_cline_height only.
*/
void validate_cheight(void)
{
check_cursor_moved(curwin);
if (!(curwin->w_valid & VALID_CHEIGHT)) {
curwin->w_cline_height = plines_win_full(curwin, curwin->w_cursor.lnum,
NULL, &curwin->w_cline_folded,
true);
curwin->w_valid |= VALID_CHEIGHT;
}
}
/*
* Validate w_wcol and w_virtcol only.
*/
void validate_cursor_col(void)
{
validate_virtcol();
if (!(curwin->w_valid & VALID_WCOL)) {
colnr_T col = curwin->w_virtcol;
colnr_T off = curwin_col_off();
col += off;
int width = curwin->w_width_inner - off + curwin_col_off2();
// long line wrapping, adjust curwin->w_wrow
if (curwin->w_p_wrap && col >= (colnr_T)curwin->w_width_inner
&& width > 0) {
// use same formula as what is used in curs_columns()
col -= ((col - curwin->w_width_inner) / width + 1) * width;
}
if (col > (int)curwin->w_leftcol) {
col -= curwin->w_leftcol;
} else {
col = 0;
}
curwin->w_wcol = col;
curwin->w_valid |= VALID_WCOL;
}
}
/*
* Compute offset of a window, occupied by absolute or relative line number,
* fold column and sign column (these don't move when scrolling horizontally).
*/
int win_col_off(win_T *wp)
{
return ((wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) + 1 : 0)
+ (cmdwin_type == 0 || wp != curwin ? 0 : 1)
+ win_fdccol_count(wp)
+ (win_signcol_count(wp) * win_signcol_width(wp));
}
int curwin_col_off(void)
{
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' or 'relativenumber' is on and 'n' is in
* 'cpoptions'.
*/
int win_col_off2(win_T *wp)
{
if ((wp->w_p_nu || wp->w_p_rnu) && vim_strchr(p_cpo, CPO_NUMCOL) != NULL)
return number_width(wp) + 1;
return 0;
}
int curwin_col_off2(void)
{
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(
int may_scroll /* when true, may scroll horizontally */
)
{
int n;
int width = 0;
colnr_T startcol;
colnr_T endcol;
colnr_T prev_skipcol;
long so = get_scrolloff_value();
long siso = get_sidescrolloff_value();
/*
* 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);
}
/*
* Compute the number of virtual columns.
*/
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
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 = -1;
int 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;
int textwidth = curwin->w_width_inner - extra;
if (textwidth <= 0) {
// No room for text, put cursor in last char of window.
curwin->w_wcol = curwin->w_width_inner - 1;
curwin->w_wrow = curwin->w_height_inner - 1;
} else if (curwin->w_p_wrap
&& curwin->w_width_inner != 0
) {
width = textwidth + curwin_col_off2();
// long line wrapping, adjust curwin->w_wrow
if (curwin->w_wcol >= curwin->w_width_inner) {
// this same formula is used in validate_cursor_col()
n = (curwin->w_wcol - curwin->w_width_inner) / width + 1;
curwin->w_wcol -= n * width;
curwin->w_wrow += n;
/* 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 && *get_cursor_pos_ptr() == NUL
&& curwin->w_wcol == (int)vim_strsize(p_sbr))
curwin->w_wcol = 0;
}
}
/* 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 (may_scroll
&& !curwin->w_cline_folded
) {
/*
* 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
*/
assert(siso <= INT_MAX);
int off_left = startcol - curwin->w_leftcol - (int)siso;
int off_right =
endcol - curwin->w_leftcol - curwin->w_width_inner + (int)siso + 1;
if (off_left < 0 || off_right > 0) {
int diff = (off_left < 0) ? -off_left: off_right;
/* When far off or not enough room on either side, put cursor in
* middle of window. */
int new_leftcol;
if (p_ss == 0 || diff >= textwidth / 2 || off_right >= off_left)
new_leftcol = curwin->w_wcol - extra - textwidth / 2;
else {
if (diff < p_ss) {
assert(p_ss <= INT_MAX);
diff = (int)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;
win_check_anchored_floats(curwin);
// screen has to be redrawn with new curwin->w_leftcol
redraw_later(curwin, 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;
/* 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);
prev_skipcol = curwin->w_skipcol;
int plines = 0;
if ((curwin->w_wrow >= curwin->w_height_inner
|| ((prev_skipcol > 0
|| curwin->w_wrow + so >= curwin->w_height_inner)
&& (plines =
plines_win_nofill(curwin, curwin->w_cursor.lnum, false)) - 1
>= curwin->w_height_inner))
&& curwin->w_height_inner != 0
&& curwin->w_cursor.lnum == curwin->w_topline
&& width > 0
&& curwin->w_width_inner != 0
) {
/* 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 + 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 (plines == 0) {
plines = plines_win(curwin, curwin->w_cursor.lnum, false);
}
plines--;
if (plines > curwin->w_wrow + so) {
assert(so <= INT_MAX);
n = curwin->w_wrow + (int)so;
} else {
n = plines;
}
if ((colnr_T)n >= curwin->w_height_inner + curwin->w_skipcol / width) {
extra += 2;
}
if (extra == 3 || plines < so * 2) {
// not enough room for 'scrolloff', put cursor in the middle
n = curwin->w_virtcol / width;
if (n > curwin->w_height_inner / 2) {
n -= curwin->w_height_inner / 2;
} else {
n = 0;
}
// don't skip more than necessary
if (n > plines - curwin->w_height_inner + 1) {
n = plines - curwin->w_height_inner + 1;
}
curwin->w_skipcol = n * width;
} else if (extra == 1) {
// less then 'scrolloff' lines above, decrease skipcol
assert(so <= INT_MAX);
extra = (curwin->w_skipcol + (int)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_inner + 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_inner) {
// small window, make sure cursor is in it
extra = curwin->w_wrow - curwin->w_height_inner + 1;
curwin->w_skipcol += extra * width;
curwin->w_wrow -= extra;
}
// extra could be either positive or negative
extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width;
win_scroll_lines(curwin, 0, extra);
} else {
curwin->w_skipcol = 0;
}
if (prev_skipcol != curwin->w_skipcol) {
redraw_later(curwin, NOT_VALID);
}
/* Redraw when w_virtcol changes and 'cursorcolumn' is set */
if (curwin->w_p_cuc && (curwin->w_valid & VALID_VIRTCOL) == 0
&& !pum_visible()) {
redraw_later(curwin, SOME_VALID);
}
// now w_leftcol is valid, avoid check_cursor_moved() thinking otherwise
curwin->w_valid_leftcol = curwin->w_leftcol;
curwin->w_valid |= VALID_WCOL|VALID_WROW|VALID_VIRTCOL;
}
/// Compute the screen position of text character at "pos" in window "wp"
/// The resulting values are one-based, zero when character is not visible.
///
/// @param[out] rowp screen row
/// @param[out] scolp start screen column
/// @param[out] ccolp cursor screen column
/// @param[out] ecolp end screen column
void textpos2screenpos(win_T *wp, pos_T *pos, int *rowp, int *scolp,
int *ccolp, int *ecolp, bool local)
{
colnr_T scol = 0, ccol = 0, ecol = 0;
int row = 0;
int rowoff = 0;
colnr_T coloff = 0;
bool visible_row = false;
if (pos->lnum >= wp->w_topline && pos->lnum < wp->w_botline) {
row = plines_m_win(wp, wp->w_topline, pos->lnum - 1) + 1;
visible_row = true;
} else if (pos->lnum < wp->w_topline) {
row = 0;
} else {
row = wp->w_height_inner;
}
bool existing_row = (pos->lnum > 0
&& pos->lnum <= wp->w_buffer->b_ml.ml_line_count);
if ((local && existing_row) || visible_row) {
colnr_T off;
colnr_T col;
int width;
getvcol(wp, pos, &scol, &ccol, &ecol);
// similar to what is done in validate_cursor_col()
col = scol;
off = win_col_off(wp);
col += off;
width = wp->w_width - off + win_col_off2(wp);
// long line wrapping, adjust row
if (wp->w_p_wrap && col >= (colnr_T)wp->w_width && width > 0) {
// use same formula as what is used in curs_columns()
rowoff = visible_row ? ((col - wp->w_width) / width + 1) : 0;
col -= rowoff * width;
}
col -= wp->w_leftcol;
if (col >= 0 && col < wp->w_width) {
coloff = col - scol + (local ? 0 : wp->w_wincol) + 1;
} else {
scol = ccol = ecol = 0;
// character is left or right of the window
if (local) {
coloff = col < 0 ? -1 : wp->w_width_inner + 1;
} else {
row = 0;
}
}
}
*rowp = (local ? 0 : wp->w_winrow) + row + rowoff;
*scolp = scol + coloff;
*ccolp = ccol + coloff;
*ecolp = ecol + coloff;
}
/// Scroll the current window down by "line_count" logical lines. "CTRL-Y"
///
/// @param line_count number of lines to scroll
/// @param byfold if true, count a closed fold as one line
bool scrolldown(long line_count, int byfold)
{
int done = 0; // total # of physical lines done
/* Make sure w_topline is at the first of a sequence of folded lines. */
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
validate_cursor(); /* w_wrow needs to be valid */
while (line_count-- > 0) {
if (curwin->w_topfill < diff_check(curwin, curwin->w_topline)
&& curwin->w_topfill < curwin->w_height_inner - 1) {
curwin->w_topfill++;
done++;
} else {
if (curwin->w_topline == 1)
break;
--curwin->w_topline;
curwin->w_topfill = 0;
/* A sequence of folded lines only counts for one logical line */
linenr_T first;
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
done += plines_nofill(curwin->w_topline);
}
--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 */
if (curwin->w_cursor.lnum == curwin->w_topline)
curwin->w_cline_row = 0;
check_topfill(curwin, true);
/*
* Compute the row number of the last row of the cursor line
* and move the cursor onto the displayed part of the window.
*/
int wrow = curwin->w_wrow;
if (curwin->w_p_wrap
&& curwin->w_width_inner != 0
) {
validate_virtcol();
validate_cheight();
wrow += curwin->w_cline_height - 1 -
curwin->w_virtcol / curwin->w_width_inner;
}
bool moved = false;
while (wrow >= curwin->w_height_inner && curwin->w_cursor.lnum > 1) {
linenr_T first;
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
wrow -= plines(curwin->w_cursor.lnum--);
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL);
moved = true;
}
if (moved) {
/* Move cursor to first line of closed fold. */
foldAdjustCursor();
coladvance(curwin->w_curswant);
}
return moved;
}
/// Scroll the current window up by "line_count" logical lines. "CTRL-E"
///
/// @param line_count number of lines to scroll
/// @param byfold if true, count a closed fold as one line
bool scrollup(long line_count, int byfold)
{
linenr_T topline = curwin->w_topline;
linenr_T botline = curwin->w_botline;
if ((byfold && hasAnyFolding(curwin))
|| curwin->w_p_diff) {
// count each sequence of folded lines as one logical line
linenr_T lnum = curwin->w_topline;
while (line_count--) {
if (curwin->w_topfill > 0)
--curwin->w_topfill;
else {
if (byfold)
(void)hasFolding(lnum, NULL, &lnum);
if (lnum >= curbuf->b_ml.ml_line_count)
break;
++lnum;
curwin->w_topfill = diff_check_fill(curwin, lnum);
}
}
/* approximate w_botline */
curwin->w_botline += lnum - curwin->w_topline;
curwin->w_topline = lnum;
} else {
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;
check_topfill(curwin, false);
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);
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);
}
bool moved = topline != curwin->w_topline
|| botline != curwin->w_botline;
return moved;
}
/*
* Don't end up with too many filler lines in the window.
*/
void
check_topfill (
win_T *wp,
bool down /* when true scroll down when not enough space */
)
{
if (wp->w_topfill > 0) {
int n = plines_win_nofill(wp, wp->w_topline, true);
if (wp->w_topfill + n > wp->w_height_inner) {
if (down && wp->w_topline > 1) {
--wp->w_topline;
wp->w_topfill = 0;
} else {
wp->w_topfill = wp->w_height_inner - n;
if (wp->w_topfill < 0) {
wp->w_topfill = 0;
}
}
}
}
win_check_anchored_floats(curwin);
}
/*
* Use as many filler lines as possible for w_topline. Make sure w_topline
* is still visible.
*/
static void max_topfill(void)
{
int n = plines_nofill(curwin->w_topline);
if (n >= curwin->w_height_inner) {
curwin->w_topfill = 0;
} else {
curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline);
if (curwin->w_topfill + n > curwin->w_height_inner) {
curwin->w_topfill = curwin->w_height_inner - n;
}
}
}
/*
* Scroll the screen one line down, but don't do it if it would move the
* cursor off the screen.
*/
void scrolldown_clamp(void)
{
int can_fill = (curwin->w_topfill
< diff_check_fill(curwin, curwin->w_topline));
if (curwin->w_topline <= 1
&& !can_fill
)
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.
*/
int end_row = curwin->w_wrow;
if (can_fill)
++end_row;
else
end_row += plines_nofill(curwin->w_topline - 1);
if (curwin->w_p_wrap
&& curwin->w_width_inner != 0
) {
validate_cheight();
validate_virtcol();
end_row += curwin->w_cline_height - 1 -
curwin->w_virtcol / curwin->w_width_inner;
}
if (end_row < curwin->w_height_inner - get_scrolloff_value()) {
if (can_fill) {
++curwin->w_topfill;
check_topfill(curwin, true);
} else {
--curwin->w_topline;
curwin->w_topfill = 0;
}
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
--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(void)
{
if (curwin->w_topline == curbuf->b_ml.ml_line_count
&& curwin->w_topfill == 0
)
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.
*/
int start_row = curwin->w_wrow - plines_nofill(curwin->w_topline)
- curwin->w_topfill;
if (curwin->w_p_wrap
&& curwin->w_width_inner != 0
) {
validate_virtcol();
start_row -= curwin->w_virtcol / curwin->w_width_inner;
}
if (start_row >= get_scrolloff_value()) {
if (curwin->w_topfill > 0) {
curwin->w_topfill--;
} else {
(void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline);
curwin->w_topline++;
}
curwin->w_botline++; // approximate w_botline
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
}
}
/*
* 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: MAXCOL.
*/
static void topline_back(lineoff_T *lp)
{
if (lp->fill < diff_check_fill(curwin, lp->lnum)) {
/* Add a filler line. */
++lp->fill;
lp->height = 1;
} else {
--lp->lnum;
lp->fill = 0;
if (lp->lnum < 1)
lp->height = MAXCOL;
else if (hasFolding(lp->lnum, &lp->lnum, NULL))
/* Add a closed fold */
lp->height = 1;
else {
lp->height = plines_nofill(lp->lnum);
}
}
}
/*
* 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(lineoff_T *lp)
{
if (lp->fill < diff_check_fill(curwin, lp->lnum + 1)) {
/* Add a filler line. */
++lp->fill;
lp->height = 1;
} else {
++lp->lnum;
lp->fill = 0;
if (lp->lnum > curbuf->b_ml.ml_line_count) {
lp->height = MAXCOL;
} else if (hasFolding(lp->lnum, NULL, &lp->lnum)) {
// Add a closed fold
lp->height = 1;
} else {
lp->height = plines_nofill(lp->lnum);
}
}
}
/*
* 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(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(lineoff_T *lp)
{
if (lp->fill > 0) {
lp->fill = diff_check_fill(curwin, lp->lnum) - lp->fill + 1;
--lp->lnum;
}
}
/*
* 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(int min_scroll, int always)
{
int scrolled = 0;
linenr_T top; /* just above displayed lines */
linenr_T bot; /* just below displayed lines */
linenr_T old_topline = curwin->w_topline;
linenr_T old_topfill = curwin->w_topfill;
linenr_T new_topline;
int off = (int)get_scrolloff_value();
if (mouse_dragging > 0)
off = mouse_dragging - 1;
/*
* 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();
int used = curwin->w_cline_height; // includes filler lines above
if (curwin->w_cursor.lnum < curwin->w_topline) {
scrolled = used;
}
if (hasFolding(curwin->w_cursor.lnum, &top, &bot)) {
--top;
++bot;
} else {
top = curwin->w_cursor.lnum - 1;
bot = curwin->w_cursor.lnum + 1;
}
new_topline = top + 1;
// "used" already contains the number of filler lines above, don't add it
// again.
// Hide filler lines above cursor line by adding them to "extra".
int extra = diff_check_fill(curwin, curwin->w_cursor.lnum);
/*
* 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) {
int i = hasFolding(top, &top, NULL)
? 1 // count one logical line for a sequence of folded lines
: plines_nofill(top);
used += i;
if (extra + i <= off && bot < curbuf->b_ml.ml_line_count) {
if (hasFolding(bot, NULL, &bot))
/* count one logical line for a sequence of folded lines */
++used;
else
used += plines(bot);
}
if (used > curwin->w_height_inner) {
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_inner) {
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;
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);
if (curwin->w_topline != old_topline
|| curwin->w_topfill != old_topfill
)
curwin->w_valid &=
~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP);
curwin->w_valid |= VALID_TOPLINE;
curwin->w_viewport_invalid = true;
}
}
/*
* Set w_empty_rows and w_filler_rows for window "wp", having used up "used"
* screen lines for text lines.
*/
void set_empty_rows(win_T *wp, int used)
{
wp->w_filler_rows = 0;
if (used == 0) {
wp->w_empty_rows = 0; // single line that doesn't fit
} else {
wp->w_empty_rows = wp->w_height_inner - used;
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;
}
}
}
}
/*
* 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(int min_scroll, int set_topbot)
{
int used;
int scrolled = 0;
int extra = 0;
lineoff_T loff;
lineoff_T boff;
int fill_below_window;
linenr_T old_topline = curwin->w_topline;
int old_topfill = curwin->w_topfill;
linenr_T old_botline = curwin->w_botline;
int old_valid = curwin->w_valid;
int old_empty_rows = curwin->w_empty_rows;
linenr_T cln = curwin->w_cursor.lnum; // Cursor Line Number
long so = get_scrolloff_value();
if (set_topbot) {
used = 0;
curwin->w_botline = cln + 1;
loff.fill = 0;
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 (loff.height == MAXCOL
|| used + loff.height > curwin->w_height_inner) {
break;
}
used += loff.height;
curwin->w_topfill = loff.fill;
}
set_empty_rows(curwin, used);
curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
if (curwin->w_topline != old_topline
|| curwin->w_topfill != old_topfill
)
curwin->w_valid &= ~(VALID_WROW|VALID_CROW);
} else
validate_botline();
/* The lines of the cursor line itself are always used. */
used = plines_nofill(cln);
/* 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
*/
if (!hasFolding(curwin->w_cursor.lnum, &loff.lnum, &boff.lnum)) {
loff.lnum = cln;
boff.lnum = cln;
}
loff.fill = 0;
boff.fill = 0;
fill_below_window = diff_check_fill(curwin, curwin->w_botline)
- curwin->w_filler_rows;
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 >= (mouse_dragging > 0 ? mouse_dragging - 1 : so))
|| boff.lnum + 1 > curbuf->b_ml.ml_line_count)
&& loff.lnum <= curwin->w_botline
&& (loff.lnum < curwin->w_botline
|| loff.fill >= fill_below_window)
) {
break;
}
/* Add one line above */
topline_back(&loff);
if (loff.height == MAXCOL) {
used = MAXCOL;
} else {
used += loff.height;
}
if (used > curwin->w_height_inner) {
break;
}
if (loff.lnum >= curwin->w_botline
&& (loff.lnum > curwin->w_botline
|| loff.fill <= fill_below_window)
) {
/* Count screen lines that are below the window. */
scrolled += loff.height;
if (loff.lnum == curwin->w_botline
&& loff.fill == 0) {
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_inner) {
break;
}
if (extra < (mouse_dragging > 0 ? mouse_dragging - 1 : so)
|| scrolled < min_scroll) {
extra += boff.height;
if (boff.lnum >= curwin->w_botline
|| (boff.lnum + 1 == curwin->w_botline
&& boff.fill > curwin->w_filler_rows)
) {
/* Count screen lines that are below the window. */
scrolled += boff.height;
if (boff.lnum == curwin->w_botline
&& boff.fill == 0
)
scrolled -= curwin->w_empty_rows;
}
}
}
}
linenr_T line_count;
// 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_inner) {
line_count = used;
// scroll minimal number of lines
} else {
line_count = 0;
boff.fill = curwin->w_topfill;
boff.lnum = curwin->w_topline - 1;
int i;
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_inner && 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;
curwin->w_viewport_invalid = true;
}
/// Recompute topline to put the cursor halfway across the window
///
/// @param atend if true, also put the cursor halfway to the end of the file.
///
void scroll_cursor_halfway(int atend)
{
int above = 0;
int topfill = 0;
int below = 0;
lineoff_T loff;
lineoff_T boff;
linenr_T old_topline = curwin->w_topline;
loff.lnum = boff.lnum = curwin->w_cursor.lnum;
(void)hasFolding(loff.lnum, &loff.lnum, &boff.lnum);
int used = plines_nofill(loff.lnum);
loff.fill = 0;
boff.fill = 0;
linenr_T 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_inner) {
break;
}
below += boff.height;
} else {
++below; /* count a "~" line */
if (atend)
++used;
}
}
if (below > above) { /* add a line above the cursor */
topline_back(&loff);
if (loff.height == MAXCOL)
used = MAXCOL;
else
used += loff.height;
if (used > curwin->w_height_inner) {
break;
}
above += loff.height;
topline = loff.lnum;
topfill = loff.fill;
}
}
if (!hasFolding(topline, &curwin->w_topline, NULL))
curwin->w_topline = topline;
curwin->w_topfill = topfill;
if (old_topline > curwin->w_topline + curwin->w_height_inner) {
curwin->w_botfill = false;
}
check_topfill(curwin, false);
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(void)
{
/*
* 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.
*/
int above_wanted = (int)get_scrolloff_value();
int below_wanted = (int)get_scrolloff_value();
if (mouse_dragging > 0) {
above_wanted = mouse_dragging - 1;
below_wanted = mouse_dragging - 1;
}
if (curwin->w_topline == 1) {
above_wanted = 0;
int max_off = curwin->w_height_inner / 2;
if (below_wanted > max_off) {
below_wanted = max_off;
}
}
validate_botline();
if (curwin->w_botline == curbuf->b_ml.ml_line_count + 1
&& mouse_dragging == 0) {
below_wanted = 0;
int max_off = (curwin->w_height_inner - 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.
*/
linenr_T cln = curwin->w_cursor.lnum; /* Cursor Line Number */
if (cln >= curwin->w_topline + above_wanted
&& cln < curwin->w_botline - below_wanted
&& !hasAnyFolding(curwin)
)
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
*/
linenr_T topline = curwin->w_topline;
linenr_T botline = curwin->w_botline - 1;
/* count filler lines as context */
int above = curwin->w_topfill; /* screen lines above topline */
int below = curwin->w_filler_rows; /* screen lines below botline */
while ((above < above_wanted || below < below_wanted) && topline < botline) {
if (below < below_wanted && (below <= above || above >= above_wanted)) {
if (hasFolding(botline, &botline, NULL))
++below;
else
below += plines(botline);
--botline;
}
if (above < above_wanted && (above < below || below >= below_wanted)) {
if (hasFolding(topline, NULL, &topline))
++above;
else
above += plines_nofill(topline);
/* Count filler lines below this line as context. */
if (topline < botline)
above += diff_check_fill(curwin, topline + 1);
++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;
curwin->w_viewport_invalid = true;
}
/*
* move screen 'count' pages up or down and update screen
*
* return FAIL for failure, OK otherwise
*/
int onepage(Direction dir, long count)
{
long n;
int retval = OK;
lineoff_T loff;
linenr_T old_topline = curwin->w_topline;
long so = get_scrolloff_value();
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 - so)
&& curwin->w_botline > curbuf->b_ml.ml_line_count)
: (curwin->w_topline == 1
&& curwin->w_topfill ==
diff_check_fill(curwin, curwin->w_topline)
)) {
beep_flush();
retval = FAIL;
break;
}
loff.fill = 0;
if (dir == FORWARD) {
if (ONE_WINDOW && p_window > 0 && p_window < Rows - 1) {
/* Vi compatible scrolling */
if (p_window <= 2)
++curwin->w_topline;
else
curwin->w_topline += p_window - 2;
if (curwin->w_topline > curbuf->b_ml.ml_line_count)
curwin->w_topline = curbuf->b_ml.ml_line_count;
curwin->w_cursor.lnum = curwin->w_topline;
} else if (curwin->w_botline > curbuf->b_ml.ml_line_count) {
/* at end of file */
curwin->w_topline = curbuf->b_ml.ml_line_count;
curwin->w_topfill = 0;
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;
loff.fill = diff_check_fill(curwin, loff.lnum)
- curwin->w_filler_rows;
get_scroll_overlap(&loff, -1);
curwin->w_topline = loff.lnum;
curwin->w_topfill = loff.fill;
check_topfill(curwin, false);
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 */
if (curwin->w_topline == 1) {
/* Include max number of filler lines */
max_topfill();
continue;
}
if (ONE_WINDOW && p_window > 0 && p_window < Rows - 1) {
/* Vi compatible scrolling (sort of) */
if (p_window <= 2)
--curwin->w_topline;
else
curwin->w_topline -= p_window - 2;
if (curwin->w_topline < 1)
curwin->w_topline = 1;
curwin->w_cursor.lnum = curwin->w_topline + p_window - 1;
if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count)
curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
continue;
}
/* 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;
loff.fill = diff_check_fill(curwin, loff.lnum + 1)
- curwin->w_topfill;
get_scroll_overlap(&loff, 1);
if (loff.lnum >= curbuf->b_ml.ml_line_count) {
loff.lnum = curbuf->b_ml.ml_line_count;
loff.fill = 0;
} else {
botline_topline(&loff);
}
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_inner && loff.lnum >= 1) {
topline_back(&loff);
if (loff.height == MAXCOL)
n = MAXCOL;
else
n += loff.height;
}
if (loff.lnum < 1) { /* at begin of file */
curwin->w_topline = 1;
max_topfill();
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
} else {
/* Go two lines forward again. */
topline_botline(&loff);
botline_forw(&loff);
botline_forw(&loff);
botline_topline(&loff);
/* We're at the wrong end of a fold now. */
(void)hasFolding(loff.lnum, &loff.lnum, NULL);
/* Always scroll at least one line. Avoid getting stuck on
* very long lines. */
if (loff.lnum >= curwin->w_topline
&& (loff.lnum > curwin->w_topline
|| loff.fill >= curwin->w_topfill)
) {
/* 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) {
--curwin->w_topline;
curwin->w_topfill = 0;
}
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;
curwin->w_topfill = loff.fill;
check_topfill(curwin, false);
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
}
}
}
}
foldAdjustCursor();
cursor_correct();
check_cursor_col();
if (retval == OK) {
beginline(BL_SOL | BL_FIX);
}
curwin->w_valid &= ~(VALID_WCOL|VALID_WROW|VALID_VIRTCOL);
if (retval == OK && dir == FORWARD) {
// 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 (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;
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
}
} else if (curwin->w_botline > curbuf->b_ml.ml_line_count) {
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
}
}
redraw_later(curwin, 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(lineoff_T *lp, int dir)
{
int min_height = curwin->w_height_inner - 2;
if (lp->fill > 0)
lp->height = 1;
else
lp->height = plines_nofill(lp->lnum);
int h1 = lp->height;
if (h1 > min_height)
return; /* no overlap */
lineoff_T loff0 = *lp;
if (dir > 0)
botline_forw(lp);
else
topline_back(lp);
int h2 = lp->height;
if (h2 == MAXCOL || h2 + h1 > min_height) {
*lp = loff0; /* no overlap */
return;
}
lineoff_T loff1 = *lp;
if (dir > 0)
botline_forw(lp);
else
topline_back(lp);
int h3 = lp->height;
if (h3 == MAXCOL || h3 + h2 > min_height) {
*lp = loff0; /* no overlap */
return;
}
lineoff_T loff2 = *lp;
if (dir > 0)
botline_forw(lp);
else
topline_back(lp);
int h4 = lp->height;
if (h4 == MAXCOL || h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height)
*lp = loff1; /* 1 line overlap */
else
*lp = loff2; /* 2 lines overlap */
return;
}
// Scroll 'scroll' lines up or down.
void halfpage(bool flag, linenr_T Prenum)
{
long scrolled = 0;
int i;
if (Prenum) {
curwin->w_p_scr = (Prenum > curwin->w_height_inner) ? curwin->w_height_inner
: Prenum;
}
assert(curwin->w_p_scr <= INT_MAX);
int n = curwin->w_p_scr <= curwin->w_height_inner ? (int)curwin->w_p_scr
: curwin->w_height_inner;
update_topline();
validate_botline();
int room = curwin->w_empty_rows + curwin->w_filler_rows;
if (flag) {
/*
* scroll the text up
*/
while (n > 0 && curwin->w_botline <= curbuf->b_ml.ml_line_count) {
if (curwin->w_topfill > 0) {
i = 1;
n--;
curwin->w_topfill--;
} else {
i = plines_nofill(curwin->w_topline);
n -= i;
if (n < 0 && scrolled > 0)
break;
(void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline);
++curwin->w_topline;
curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline);
if (curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count) {
++curwin->w_cursor.lnum;
curwin->w_valid &=
~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL);
}
}
curwin->w_valid &= ~(VALID_CROW|VALID_WROW);
scrolled += i;
/*
* Correct w_botline for changed w_topline.
* Won't work when there are filler lines.
*/
if (curwin->w_p_diff)
curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP);
else {
room += i;
do {
i = plines(curwin->w_botline);
if (i > room)
break;
(void)hasFolding(curwin->w_botline, NULL,
&curwin->w_botline);
++curwin->w_botline;
room -= i;
} while (curwin->w_botline <= curbuf->b_ml.ml_line_count);
}
}
// When hit bottom of the file: move cursor down.
if (n > 0) {
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
curwin->w_cursor.lnum += n;
check_cursor_lnum();
}
} else {
/*
* scroll the text down
*/
while (n > 0 && curwin->w_topline > 1) {
if (curwin->w_topfill < diff_check_fill(curwin, curwin->w_topline)) {
i = 1;
n--;
curwin->w_topfill++;
} else {
i = plines_nofill(curwin->w_topline - 1);
n -= i;
if (n < 0 && scrolled > 0)
break;
--curwin->w_topline;
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
curwin->w_topfill = 0;
}
curwin->w_valid &= ~(VALID_CROW|VALID_WROW|
VALID_BOTLINE|VALID_BOTLINE_AP);
scrolled += i;
if (curwin->w_cursor.lnum > 1) {
--curwin->w_cursor.lnum;
curwin->w_valid &= ~(VALID_VIRTCOL|VALID_CHEIGHT|VALID_WCOL);
}
}
// 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 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
curwin->w_cursor.lnum -= n;
}
}
/* Move cursor to first line of closed fold. */
foldAdjustCursor();
check_topfill(curwin, !flag);
cursor_correct();
beginline(BL_SOL | BL_FIX);
redraw_later(curwin, VALID);
}
void do_check_cursorbind(void)
{
linenr_T line = curwin->w_cursor.lnum;
colnr_T col = curwin->w_cursor.col;
colnr_T coladd = curwin->w_cursor.coladd;
colnr_T curswant = curwin->w_curswant;
int set_curswant = curwin->w_set_curswant;
win_T *old_curwin = curwin;
buf_T *old_curbuf = curbuf;
int old_VIsual_select = VIsual_select;
int old_VIsual_active = VIsual_active;
/*
* loop through the cursorbound windows
*/
VIsual_select = VIsual_active = 0;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
curwin = wp;
curbuf = curwin->w_buffer;
/* skip original window and windows with 'noscrollbind' */
if (curwin != old_curwin && curwin->w_p_crb) {
if (curwin->w_p_diff) {
curwin->w_cursor.lnum =
diff_get_corresponding_line(old_curbuf, line);
} else {
curwin->w_cursor.lnum = line;
}
curwin->w_cursor.col = col;
curwin->w_cursor.coladd = coladd;
curwin->w_curswant = curswant;
curwin->w_set_curswant = set_curswant;
/* Make sure the cursor is in a valid position. Temporarily set
* "restart_edit" to allow the cursor to be beyond the EOL. */
{
int restart_edit_save = restart_edit;
restart_edit = true;
check_cursor();
if (win_cursorline_standout(curwin) || curwin->w_p_cuc) {
validate_cursor();
}
restart_edit = restart_edit_save;
}
// Correct cursor for multi-byte character.
mb_adjust_cursor();
redraw_later(curwin, VALID);
// Only scroll when 'scrollbind' hasn't done this.
if (!curwin->w_p_scb) {
update_topline();
}
curwin->w_redr_status = true;
}
}
/*
* reset current-window
*/
VIsual_select = old_VIsual_select;
VIsual_active = old_VIsual_active;
curwin = old_curwin;
curbuf = old_curbuf;
}
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