#include <u.h>#include <libc.h>#include <thread.h>#include <fcall.h>#include <draw.h>#include <mouse.h>#include <cursor.h>#include <keyboard.h>#include <frame.h>#include <9p.h>#include <ctype.h>#include "gui.h" int textdebug; static voiddumpop(char* pref, Edit* e){	int	nr; 	nr = e->nr > 3 ? 3 : e->nr;	fprint(2, "%s%c%s %3d #%d\t [%.*S]\n", pref,		e->end ? '*' : ' ',		e->op == Ins ? "ins" : "del",		e->pos, e->nr, nr, e->r);} static voiddumpedits(Panel* p){	Edit*	e; 	fprint(2, "%s edits:\n", p->name);	for (e = p->undos; e && e < p->undo; e++)		dumpop("\t", e);	fprint(2, "\n");} Edit*addedit(Panel* p, int op, Rune* r, int nr, int pos){	Edit*	e;	int	nlen;	Edit*	last; 	/* merge to succesive inserts into a single one, if feasible.	 */	if (op == Ins && p->undos && p->undo > p->undos){		last = p->undo - 1;		if (last->op == Ins && !last->end && pos == last->pos + last->nr){			nlen = (nr + last->nr) * sizeof(Rune);			last->r = erealloc9p(last->r, nlen);			memmove(last->r + last->nr, r, nr*sizeof(Rune));			last->nr += nr;			return last;		}	}	if (p->undo == p->undos+p->nundos){		if (!(p->nundos%16))			p->undos = erealloc9p(p->undos, (p->nundos+16)*sizeof(Edit));		e = p->undos + p->nundos++;		p->undo = p->undos + p->nundos;	} else {		assert(p->undo && p->undo < p->undos+p->nundos);		e = p->undo++;		free(e->r);	}	e->r = emalloc9p(nr * sizeof(Rune));	memmove(e->r, r, nr*sizeof(Rune));	e->nr = nr;	e->pos= pos;	e->op= op;	e->end = 0;	if (textdebug)		dumpedits(p);	return e;} voidnewedit(Panel* p){	Edit*	e; 	if (p->undo && p->undo > p->undos){		e = p->undo-1;		e->end = 1;	}} inthasedits(Panel* p){	if (!p->undo)		return 0;	return (p->undo - p->undos) != p->cundo;} voidsetnoedits(Panel* p){	if (!p->undo)		p->cundo = 0;	else		p->cundo = p->undo - p->undos;} voidcleanedits(Panel* p){	int	i; 	for (i = 0; i < p->nundos; i++){		free(p->undos[i].r);	}	free(p->undos);	p->undos = p->undo = nil;	p->nundos = 0;	p->cundo = 0;	if (textdebug)		dumpedits(p);} static voidundo1(Panel* p){	p->undo--;	if (p->undo->op == Ins){		textdel(p, p->undo->r, p->undo->nr, p->undo->pos);		fillframe(p);	} else		textins(p, p->undo->r, p->undo->nr, p->undo->pos);} intundo(Panel* p){	Edit*	e;	int	some; 	some = 0;	while(p->undo && p->undo > p->undos){		undo1(p);		some++;		if (p->undo > p->undos){			e = p->undo - 1;			if (e->end)				break;		}	}	return some;} static voidredo1(Panel* p){	if (p->undo->op == Ins)		textins(p, p->undo->r, p->undo->nr, p->undo->pos);	else {		textdel(p, p->undo->r, p->undo->nr, p->undo->pos);		fillframe(p);	}	p->undo++;} intredo(Panel* p){	Edit*	e;	int	last;	int	some; 	e = p->undos + p->nundos;	for(last = some = 0; !last && p->undo && p->undo < e; some++){		last = p->undo->end;		redo1(p);	}	return some;}