452 lines
13 KiB
C
452 lines
13 KiB
C
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/* $Header: /nw/tony/src/stevie/src/RCS/misccmds.c,v 1.14 89/08/06 09:50:17 tony Exp $
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*
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* Various routines to perform specific editing operations or return
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* useful information about the file.
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*/
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#include "stevie.h"
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#include <io.h>
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#include <errno.h>
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static void openfwd(), openbwd();
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extern bool_t did_ai;
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/*
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* opencmd
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*
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* Add a blank line above or below the current line.
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*/
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void
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opencmd(dir, can_ai)
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int dir;
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int can_ai; /* if true, consider auto-indent */
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{
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if (dir == FORWARD)
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openfwd(can_ai);
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else
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openbwd(can_ai);
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}
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static void
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openfwd(can_ai)
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int can_ai;
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{
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register LINE *l;
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LNPTR *next;
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register char *s; /* string to be moved to new line, if any */
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int newindex = 0; /* index of the cursor on the new line */
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/*
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* If we're in insert mode, we need to move the remainder of the
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* current line onto the new line. Otherwise the new line is left
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* blank.
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*/
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if (State == INSERT || State == REPLACE)
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s = &Curschar->linep->s[Curschar->index];
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else
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s = "";
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if ((next = nextline(Curschar)) == NULL) /* open on last line */
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next = Fileend;
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/*
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* By asking for as much space as the prior line had we make sure
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* that we'll have enough space for any auto-indenting.
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*/
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if ((l = newline(strlen(Curschar->linep->s) + SLOP)) == NULL)
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return;
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if (*s != NUL)
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strcpy(l->s, s); /* copy string to new line */
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else if (can_ai && P(P_AI) && !anyinput()) {
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char *p;
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/*
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* Copy prior line, and truncate after white space
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*/
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strcpy(l->s, Curschar->linep->s);
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for (p = l->s; *p == ' ' || *p == TAB ;p++)
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;
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*p = NUL;
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newindex = (int)(p - l->s);
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/*
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* If we just did an auto-indent, then we didn't type
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* anything on the prior line, and it should be truncated.
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*/
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if (did_ai)
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Curschar->linep->s[0] = NUL;
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did_ai = TRUE;
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}
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/* truncate current line at cursor */
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if (State == INSERT || State == REPLACE)
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*s = NUL;
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Curschar->linep->next = l; /* link neighbors to new line */
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next->linep->prev = l;
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l->prev = Curschar->linep; /* link new line to neighbors */
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l->next = next->linep;
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if (next == Fileend) /* new line at end */
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l->num = Curschar->linep->num + LINEINC;
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else if ((l->prev->num) + 1 == l->next->num) /* no gap, renumber */
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renum();
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else { /* stick it in the middle */
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unsigned long lnum;
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lnum = ((long)l->prev->num + (long)l->next->num) / 2;
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l->num = lnum;
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}
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/*
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* Get the cursor to the start of the line, so that 'Cursrow'
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* gets set to the right physical line number for the stuff
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* that follows...
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*/
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Curschar->index = 0;
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cursupdate();
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/*
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* If we're doing an open on the last logical line, then
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* go ahead and scroll the screen up. Otherwise, just insert
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* a blank line at the right place. We use calls to plines()
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* in case the cursor is resting on a long line.
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*/
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if (Cursrow + plines(Curschar) == (Rows - 1))
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scrollup(1);
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else
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s_ins(Cursrow+plines(Curschar), 1);
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*Curschar = *nextline(Curschar); /* cursor moves down */
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Curschar->index = newindex;
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updatescreen(); /* because Botchar is now invalid... */
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cursupdate(); /* update Cursrow before insert */
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}
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static void
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openbwd(can_ai)
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int can_ai;
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{
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register LINE *l;
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LINE *prev;
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int newindex = 0;
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prev = Curschar->linep->prev;
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if ((l = newline(strlen(Curschar->linep->s) + SLOP)) == NULL)
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return;
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Curschar->linep->prev = l; /* link neighbors to new line */
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prev->next = l;
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l->next = Curschar->linep; /* link new line to neighbors */
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l->prev = prev;
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if (can_ai && P(P_AI) && !anyinput()) {
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char *p;
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/*
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* Copy current line, and truncate after white space
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*/
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strcpy(l->s, Curschar->linep->s);
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for (p = l->s; *p == ' ' || *p == TAB ;p++)
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;
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*p = NUL;
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newindex = (int)(p - l->s);
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did_ai = TRUE;
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}
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Curschar->linep = Curschar->linep->prev;
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Curschar->index = newindex;
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if (prev == Filetop->linep) /* new start of file */
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Filemem->linep = l;
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renum(); /* keep it simple - we don't do this often */
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cursupdate(); /* update Cursrow before insert */
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if (Cursrow != 0)
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s_ins(Cursrow, 1); /* insert a physical line */
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updatescreen();
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}
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int
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cntllines(pbegin,pend)
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register LNPTR *pbegin, *pend;
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{
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register LINE *lp;
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int lnum = 1;
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if (pbegin->linep && pend->linep)
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for (lp = pbegin->linep; lp != pend->linep ;lp = lp->next)
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lnum++;
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return(lnum);
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}
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/*
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* plines(p) - return the number of physical screen lines taken by line 'p'
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*/
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int
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plines(p)
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LNPTR *p;
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{
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register int col = 0;
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register char *s;
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s = p->linep->s;
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if (*s == NUL) /* empty line */
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return 1;
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for (; *s != NUL ;s++) {
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if ( *s == TAB && !P(P_LS))
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col += P(P_TS) - (col % P(P_TS));
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else
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col += chars[(unsigned)(*s & 0xff)].ch_size;
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}
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/*
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* If list mode is on, then the '$' at the end of
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* the line takes up one extra column.
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*/
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if (P(P_LS))
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col += 1;
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/*
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* If 'number' mode is on, add another 8.
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*/
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if (P(P_NU))
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col += 8;
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return ((col + (Columns-1)) / Columns);
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}
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void
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fileinfo()
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{
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extern int numfiles, curfile;
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register long l1, l2;
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bool_t readonly = FALSE;
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if (Filename != NULL) {
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if((_access(Filename,2) == -1) && (errno == EACCES)) {
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readonly = TRUE;
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}
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}
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if (bufempty()) {
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l1 = 0;
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l2 = 1; /* don't div by zero */
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} else {
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l1 = cntllines(Filemem, Curschar);
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l2 = cntllines(Filemem, Fileend) - 1;
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}
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if (numfiles > 1)
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smsg("\"%s\"%s%s line %ld of %ld -- %ld %% -- (file %d of %d)",
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(Filename != NULL) ? Filename : "No File",
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Changed ? " [Modified]" : "",
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readonly == TRUE ? " [Read only]" : "",
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l1, l2, (l1 * 100)/l2,
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curfile+1, numfiles);
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else
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smsg("\"%s\"%s%s line %ld of %ld -- %ld %% --",
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(Filename != NULL) ? Filename : "No File",
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Changed ? " [Modified]" : "",
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readonly == TRUE ? " [Read only]" : "",
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l1, l2, (l1 * 100)/l2);
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}
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/*
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* gotoline(n) - return a pointer to line 'n'
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*
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* Returns a pointer to the last line of the file if n is zero, or
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* beyond the end of the file.
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*/
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LNPTR *
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gotoline(n)
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register int n;
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{
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static LNPTR l;
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l.index = 0;
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if ( n == 0 )
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l = *prevline(Fileend);
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else {
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LNPTR *p;
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for (l = *Filemem; --n > 0 ;l = *p)
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if ((p = nextline(&l)) == NULL)
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break;
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}
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return &l;
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}
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void
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inschar(c)
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int c;
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{
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register char *p, *pend;
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/* make room for the new char. */
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if ( ! canincrease(1) )
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return;
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if (State != REPLACE) {
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p = &Curschar->linep->s[strlen(Curschar->linep->s) + 1];
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pend = &Curschar->linep->s[Curschar->index];
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for (; p > pend ;p--)
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*p = *(p-1);
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*p = (char)c;
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} else { /* replace mode */
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/*
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* Once we reach the end of the line, we are effectively
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* inserting new text, so make sure the string terminator
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* stays out there.
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*/
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if (gchar(Curschar) == NUL)
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Curschar->linep->s[Curschar->index+1] = NUL;
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pchar(Curschar, c);
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}
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/*
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* If we're in insert mode and showmatch mode is set, then
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* check for right parens and braces. If there isn't a match,
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* then beep. If there is a match AND it's on the screen, then
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* flash to it briefly. If it isn't on the screen, don't do anything.
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*/
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if (P(P_SM) && State == INSERT && (c == ')' || c == '}' || c == ']')) {
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LNPTR *lpos, csave;
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if ((lpos = showmatch()) == NULL) /* no match, so beep */
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beep();
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else if (LINEOF(lpos) >= LINEOF(Topchar)) {
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updatescreen(); /* show the new char first */
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csave = *Curschar;
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*Curschar = *lpos; /* move to matching char */
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cursupdate();
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windgoto(Cursrow, Curscol);
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delay(); /* brief pause */
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*Curschar = csave; /* restore cursor position */
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cursupdate();
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}
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}
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inc(Curschar);
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CHANGED;
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}
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bool_t
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delchar(fixpos)
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bool_t fixpos; /* if TRUE, fix the cursor position when done */
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{
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register int i;
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/* Check for degenerate case; there's nothing in the file. */
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if (bufempty())
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return FALSE;
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if (lineempty()) /* can't do anything */
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return FALSE;
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/* Delete the char. at Curschar by shifting everything */
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/* in the line down. */
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for ( i=Curschar->index+1; i < Curschar->linep->size ;i++)
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Curschar->linep->s[i-1] = Curschar->linep->s[i];
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/* If we just took off the last character of a non-blank line, */
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/* we don't want to end up positioned at the newline. */
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if (fixpos) {
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if (gchar(Curschar)==NUL && Curschar->index>0 && State!=INSERT)
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Curschar->index--;
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}
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CHANGED;
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return TRUE;
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}
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void
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delline(nlines, can_update)
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int nlines;
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bool_t can_update;
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{
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register LINE *p, *q;
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int dlines = 0;
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bool_t do_update = FALSE;
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while ( nlines-- > 0 ) {
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if (bufempty()) /* nothing to delete */
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break;
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if (buf1line()) { /* just clear the line */
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Curschar->linep->s[0] = NUL;
|
||
|
|
Curschar->index = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
p = Curschar->linep->prev;
|
||
|
|
q = Curschar->linep->next;
|
||
|
|
|
||
|
|
if (p == Filetop->linep) { /* first line of file so... */
|
||
|
|
Filemem->linep = q; /* adjust start of file */
|
||
|
|
Topchar->linep = q; /* and screen */
|
||
|
|
}
|
||
|
|
p->next = q;
|
||
|
|
if (q)
|
||
|
|
q->prev = p;
|
||
|
|
|
||
|
|
clrmark(Curschar->linep); /* clear marks for the line */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Delete the correct number of physical lines on the screen
|
||
|
|
*/
|
||
|
|
if (can_update) {
|
||
|
|
do_update = TRUE;
|
||
|
|
dlines += plines(Curschar);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If deleting the top line on the screen, adjust Topchar
|
||
|
|
*/
|
||
|
|
if (Topchar->linep == Curschar->linep)
|
||
|
|
Topchar->linep = q;
|
||
|
|
|
||
|
|
free(Curschar->linep->s);
|
||
|
|
free((char *) Curschar->linep);
|
||
|
|
|
||
|
|
Curschar->linep = q;
|
||
|
|
Curschar->index = 0; /* is this right? */
|
||
|
|
CHANGED;
|
||
|
|
|
||
|
|
/* If we delete the last line in the file, back up */
|
||
|
|
if ( Curschar->linep == Fileend->linep) {
|
||
|
|
Curschar->linep = Curschar->linep->prev;
|
||
|
|
/* and don't try to delete any more lines */
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if(do_update) {
|
||
|
|
s_del(Cursrow, dlines);
|
||
|
|
}
|
||
|
|
}
|