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343 lines
7.7 KiB
C
343 lines
7.7 KiB
C
/* basic.c -- implements basic.h */
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#include "basic.h"
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/* basic.c
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*
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* The routines in this file move the cursor around on the screen. They
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* compute a new value for the cursor, then adjust ".". The display code
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* always updates the cursor location, so only moves between lines, or
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* functions that adjust the top line in the window and invalidate the
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* framing, are hard.
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*
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* modified by Petri Kutvonen
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "buffer.h"
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#include "display.h"
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#include "estruct.h"
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#include "input.h"
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#include "line.h"
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#include "random.h"
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#include "terminal.h"
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#include "utf8.h"
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#include "window.h"
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int overlap = 0 ; /* line overlap in forw/back page */
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int curgoal ; /* Goal for C-P, C-N */
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/*
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* This routine, given a pointer to a struct line, and the current cursor goal
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* column, return the best choice for the offset. The offset is returned.
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* Used by "C-N" and "C-P".
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*/
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static int getgoal(struct line *dlp)
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{
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int col;
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int newcol;
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int dbo;
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int len = llength(dlp);
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col = 0;
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dbo = 0;
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while (dbo != len) {
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unicode_t c;
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int width = utf8_to_unicode(dlp->l_text, dbo, len, &c);
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newcol = col;
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/* Take tabs, ^X and \xx hex characters into account */
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if (c == '\t')
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newcol |= tabmask;
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else if (c < 0x20 || c == 0x7F)
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++newcol;
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else if (c >= 0x80 && c <= 0xa0)
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newcol += 2;
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++newcol;
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if (newcol > curgoal)
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break;
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col = newcol;
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dbo += width;
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}
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return dbo;
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}
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/*
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* Move the cursor to the beginning of the current line.
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*/
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int gotobol(int f, int n)
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{
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curwp->w_doto = 0;
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return TRUE;
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}
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/*
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* Move the cursor to the end of the current line. Trivial. No errors.
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*/
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int gotoeol(int f, int n)
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{
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curwp->w_doto = llength(curwp->w_dotp);
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return TRUE;
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}
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/*
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* Move to a particular line.
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*
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* @n: The specified line position at the current buffer.
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*/
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int gotoline(int f, int n)
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{
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int status;
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char arg[NSTRING]; /* Buffer to hold argument. */
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/* Get an argument if one doesnt exist. */
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if (f == FALSE) {
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if ((status =
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mlreply("Line to GOTO: ", arg, NSTRING)) != TRUE) {
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mlwrite("(Aborted)");
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return status;
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}
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n = atoi(arg);
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}
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/* Handle the case where the user may be passed something like this:
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* em filename +
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* In this case we just go to the end of the buffer.
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*/
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if (n == 0)
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return gotoeob(f, n);
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/* If a bogus argument was passed, then returns false. */
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if (n < 0)
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return FALSE;
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/* First, we go to the begin of the buffer. */
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gotobob(f, n);
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return forwline(f, n - 1);
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}
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/*
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* Goto the beginning of the buffer. Massive adjustment of dot. This is
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* considered to be hard motion; it really isn't if the original value of dot
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* is the same as the new value of dot. Normally bound to "M-<".
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*/
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int gotobob(int f, int n)
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{
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curwp->w_dotp = lforw(curbp->b_linep);
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curwp->w_doto = 0;
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curwp->w_flag |= WFHARD;
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return TRUE;
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}
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/*
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* Move to the end of the buffer. Dot is always put at the end of the file
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* (ZJ). The standard screen code does most of the hard parts of update.
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* Bound to "M->".
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*/
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int gotoeob(int f, int n)
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{
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curwp->w_dotp = curbp->b_linep;
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curwp->w_doto = 0;
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curwp->w_flag |= WFHARD;
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return TRUE;
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}
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/*
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* Move forward by full lines. If the number of lines to move is less than
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* zero, call the backward line function to actually do it. The last command
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* controls how the goal column is set. Bound to "C-N". No errors are
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* possible.
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*/
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int forwline(int f, int n)
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{
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struct line *dlp;
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if (n < 0)
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return backline(f, -n);
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/* if we are on the last line as we start....fail the command */
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if (curwp->w_dotp == curbp->b_linep)
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return FALSE;
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/* if the last command was not note a line move,
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reset the goal column */
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if ((lastflag & CFCPCN) == 0)
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curgoal = getccol(FALSE);
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/* flag this command as a line move */
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thisflag |= CFCPCN;
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/* and move the point down */
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dlp = curwp->w_dotp;
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while (n-- && dlp != curbp->b_linep)
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dlp = lforw(dlp);
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/* reseting the current position */
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curwp->w_dotp = dlp;
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curwp->w_doto = getgoal(dlp);
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curwp->w_flag |= WFMOVE;
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return TRUE;
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}
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/*
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* This function is like "forwline", but goes backwards. The scheme is exactly
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* the same. Check for arguments that are less than zero and call your
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* alternate. Figure out the new line and call "movedot" to perform the
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* motion. No errors are possible. Bound to "C-P".
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*/
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int backline(int f, int n)
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{
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struct line *dlp;
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if (n < 0)
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return forwline(f, -n);
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/* if we are on the last line as we start....fail the command */
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if (lback(curwp->w_dotp) == curbp->b_linep)
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return FALSE;
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/* if the last command was not note a line move,
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reset the goal column */
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if ((lastflag & CFCPCN) == 0)
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curgoal = getccol(FALSE);
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/* flag this command as a line move */
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thisflag |= CFCPCN;
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/* and move the point up */
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dlp = curwp->w_dotp;
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while (n-- && lback(dlp) != curbp->b_linep)
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dlp = lback(dlp);
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/* reseting the current position */
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curwp->w_dotp = dlp;
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curwp->w_doto = getgoal(dlp);
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curwp->w_flag |= WFMOVE;
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return TRUE;
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}
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/*
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* Scroll forward by a specified number of lines, or by a full page if no
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* argument. Bound to "C-V". The "2" in the arithmetic on the window size is
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* the overlap; this value is the default overlap value in ITS EMACS. Because
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* this zaps the top line in the display window, we have to do a hard update.
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*/
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int forwpage(int f, int n)
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{
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struct line *lp;
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if (f == FALSE) {
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#if SCROLLCODE
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if (term.t_scroll != NULL)
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if (overlap == 0)
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n = curwp->w_ntrows / 3 * 2;
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else
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n = curwp->w_ntrows - overlap;
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else
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#endif
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n = curwp->w_ntrows - 2; /* Default scroll. */
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if (n <= 0) /* Forget the overlap. */
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n = 1; /* If tiny window. */
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} else if (n < 0)
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return backpage(f, -n);
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#if CVMVAS
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else /* Convert from pages. */
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n *= curwp->w_ntrows; /* To lines. */
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#endif
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lp = curwp->w_linep;
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while (n-- && lp != curbp->b_linep)
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lp = lforw(lp);
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curwp->w_linep = lp;
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curwp->w_dotp = lp;
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curwp->w_doto = 0;
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#if SCROLLCODE
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curwp->w_flag |= WFHARD | WFKILLS;
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#else
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curwp->w_flag |= WFHARD;
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#endif
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return TRUE;
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}
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/*
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* This command is like "forwpage", but it goes backwards. The "2", like
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* above, is the overlap between the two windows. The value is from the ITS
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* EMACS manual. Bound to "M-V". We do a hard update for exactly the same
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* reason.
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*/
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int backpage(int f, int n)
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{
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struct line *lp;
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if (f == FALSE) {
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#if SCROLLCODE
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if (term.t_scroll != NULL)
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if (overlap == 0)
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n = curwp->w_ntrows / 3 * 2;
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else
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n = curwp->w_ntrows - overlap;
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else
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#endif
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n = curwp->w_ntrows - 2; /* Default scroll. */
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if (n <= 0) /* Don't blow up if the. */
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n = 1; /* Window is tiny. */
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} else if (n < 0)
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return forwpage(f, -n);
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#if CVMVAS
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else /* Convert from pages. */
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n *= curwp->w_ntrows; /* To lines. */
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#endif
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lp = curwp->w_linep;
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while (n-- && lback(lp) != curbp->b_linep)
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lp = lback(lp);
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curwp->w_linep = lp;
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curwp->w_dotp = lp;
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curwp->w_doto = 0;
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#if SCROLLCODE
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curwp->w_flag |= WFHARD | WFINS;
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#else
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curwp->w_flag |= WFHARD;
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#endif
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return TRUE;
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}
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/*
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* Set the mark in the current window to the value of "." in the window. No
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* errors are possible. Bound to "M-.".
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*/
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int setmark(int f, int n)
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{
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curwp->w_markp = curwp->w_dotp;
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curwp->w_marko = curwp->w_doto;
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mlwrite("(Mark set)");
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return TRUE;
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}
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/*
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* Swap the values of "." and "mark" in the current window. This is pretty
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* easy, bacause all of the hard work gets done by the standard routine
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* that moves the mark about. The only possible error is "no mark". Bound to
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* "C-X C-X".
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*/
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int swapmark(int f, int n)
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{
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struct line *odotp;
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int odoto;
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if (curwp->w_markp == NULL) {
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mlwrite("No mark in this window");
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return FALSE;
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}
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odotp = curwp->w_dotp;
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odoto = curwp->w_doto;
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curwp->w_dotp = curwp->w_markp;
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curwp->w_doto = curwp->w_marko;
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curwp->w_markp = odotp;
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curwp->w_marko = odoto;
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curwp->w_flag |= WFMOVE;
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return TRUE;
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}
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