/* region.c -- implements region.h */
#include "region.h"

/*	region.c
 *
 *      The routines in this file deal with the region, that magic space
 *      between "." and mark. Some functions are commands. Some functions are
 *      just for internal use.
 *
 *	Modified by Petri Kutvonen
 */

#include <assert.h>
#include <stdio.h>

#include "buffer.h"
#include "estruct.h"
#include "line.h"
#include "mlout.h"
#include "random.h"
#include "window.h"

/* Kill the region.  Ask "getregion" to figure out the bounds of the
 * region.  Move "." to the start, and kill the characters.  Bound to
 * "C-W".
 */
BINDABLE( killregion) {
	int s;
	region_t region;

	assert( !(curbp->b_mode & MDVIEW)) ;
	
	if ((s = getregion(&region)) != TRUE)
		return s;
	if ((lastflag & CFKILL) == 0)	/* This is a kill type  */
		kdelete();	/* command, so do magic */
	thisflag |= CFKILL;	/* kill buffer stuff.   */
	curwp->w_dotp = region.r_linep;
	curwp->w_doto = region.r_offset;
	return ldelete(region.r_size, TRUE);
}

/* Copy all of the characters in the region to the kill buffer.  Don't move
 * dot at all.  This is a bit like a kill region followed by a yank.  Bound
 * to "M-W".
 */
BINDABLE( copyregion) {
	line_p linep;
	int loffs;
	int s;
	region_t region;

	if ((s = getregion(&region)) != TRUE)
		return s;
	if ((lastflag & CFKILL) == 0)	/* Kill type command.   */
		kdelete();
	thisflag |= CFKILL;
	linep = region.r_linep;	/* Current line.        */
	loffs = region.r_offset;	/* Current offset.      */
	while (region.r_size--) {
		if (loffs == llength(linep)) {	/* End of line.         */
			if ((s = kinsert('\n')) != TRUE)
				return s;
			linep = lforw(linep);
			loffs = 0;
		} else {	/* Middle of line.      */
			if ((s = kinsert(lgetc(linep, loffs))) != TRUE)
				return s;
			++loffs;
		}
	}
	mloutstr( "(region copied)") ;
	return TRUE;
}

/* Lower case region.  Zap all of the upper case characters in the region
 * to lower case.  Use the region code to set the limits.  Scan the buffer,
 * doing the changes.  Call "lchange" to ensure that redisplay is done in
 * all buffers.  Bound to "C-X C-L".
 */
BINDABLE( lowerregion) {
	line_p linep;
	int loffs;
	int c;
	int s;
	region_t region;

	assert( !(curbp->b_mode & MDVIEW)) ;
	
	if ((s = getregion(&region)) != TRUE)
		return s;
	lchange(WFHARD);
	linep = region.r_linep;
	loffs = region.r_offset;
	while (region.r_size--) {
		if (loffs == llength(linep)) {
			linep = lforw(linep);
			loffs = 0;
		} else {
			c = lgetc(linep, loffs);
			if (c >= 'A' && c <= 'Z')
				lputc(linep, loffs, c + 'a' - 'A');
			++loffs;
		}
	}
	return TRUE;
}

/* Upper case region.  Zap all of the lower case characters in the region
 * to upper case.  Use the region code to set the limits.  Scan the buffer,
 * doing the changes.  Call "lchange" to ensure that redisplay is done in
 * all buffers.  Bound to "C-X C-L".
 */
BINDABLE( upperregion) {
	line_p linep;
	int loffs;
	int c;
	int s;
	region_t region;

	assert( !(curbp->b_mode & MDVIEW)) ;
	
	if ((s = getregion(&region)) != TRUE)
		return s;
	lchange(WFHARD);
	linep = region.r_linep;
	loffs = region.r_offset;
	while (region.r_size--) {
		if (loffs == llength(linep)) {
			linep = lforw(linep);
			loffs = 0;
		} else {
			c = lgetc(linep, loffs);
			if (c >= 'a' && c <= 'z')
				lputc(linep, loffs, c - 'a' + 'A');
			++loffs;
		}
	}
	return TRUE;
}

/* This routine figures out the bounds of the region in the current window,
 * and fills in the fields of the "region_t" structure pointed to by "rp".
 * Because the dot and mark are usually very close together, we scan
 * outward from dot looking for mark.  This should save time.  Return a
 * standard code.  Callers of this routine should be prepared to get an
 * "ABORT" status; we might make this have the conform thing later.
 */
int getregion( region_p rp) {
	line_p flp, blp ;
	long fsize, bsize ;

	if (curwp->w_markp == NULL) {
		mloutstr( "No mark set in this window") ;
		return FALSE;
	}
	if (curwp->w_dotp == curwp->w_markp) {
		rp->r_linep = curwp->w_dotp;
		if (curwp->w_doto < curwp->w_marko) {
			rp->r_offset = curwp->w_doto;
			rp->r_size =
			    (long) (curwp->w_marko - curwp->w_doto);
		} else {
			rp->r_offset = curwp->w_marko;
			rp->r_size =
			    (long) (curwp->w_doto - curwp->w_marko);
		}
		return TRUE;
	}
	blp = curwp->w_dotp;
	bsize = (long) curwp->w_doto;
	flp = curwp->w_dotp;
	fsize = (long) (llength(flp) - curwp->w_doto + 1);
	while (flp != curbp->b_linep || lback(blp) != curbp->b_linep) {
		if (flp != curbp->b_linep) {
			flp = lforw(flp);
			if (flp == curwp->w_markp) {
				rp->r_linep = curwp->w_dotp;
				rp->r_offset = curwp->w_doto;
				rp->r_size = fsize + curwp->w_marko;
				return TRUE;
			}
			fsize += llength(flp) + 1;
		}
		if (lback(blp) != curbp->b_linep) {
			blp = lback(blp);
			bsize += llength(blp) + 1;
			if (blp == curwp->w_markp) {
				rp->r_linep = blp;
				rp->r_offset = curwp->w_marko;
				rp->r_size = bsize - curwp->w_marko;
				return TRUE;
			}
		}
	}
	mloutstr( "Bug: lost mark") ;
	return FALSE;
}

/* end of region.c */