/*
 * The routines in this file implement commands that work word at a time.
 * There are all sorts of word mode commands. If I do any sentence and/or
 * paragraph mode commands, they are likely to be put in this file.
 */

#include        <stdio.h>
#include        "estruct.h"
#include	"edef.h"

/* Word wrap on n-spaces. Back-over whatever precedes the point on the current
 * line and stop on the first word-break or the beginning of the line. If we
 * reach the beginning of the line, jump back to the end of the word and start
 * a new line.  Otherwise, break the line at the word-break, eat it, and jump
 * back to the end of the word.
 * Returns TRUE on success, FALSE on errors.
 */
wrapword(n)
int n;
{
        register int cnt;	/* size of word wrapped to next line */

	/* backup from the <NL> 1 char */
        if (!backchar(0, 1))
	        return(FALSE);

	/* back up until we aren't in a word,
	   make sure there is a break in the line */
        cnt = 0;
        while (inword()) {
                cnt++;
                if (!backchar(0, 1))
                        return(FALSE);
        }

	/* delete the forward space */
        if (!forwdel(0, 1))
                return(FALSE);

	/* put in a end of line */
        if (!newline(0, 1))
                return(FALSE);

	/* and past the first word */
	while (cnt-- > 0) {
		if (forwchar(FALSE, 1) == FALSE)
			return(FALSE);
	}
        return(TRUE);
}

/*
 * Move the cursor backward by "n" words. All of the details of motion are
 * performed by the "backchar" and "forwchar" routines. Error if you try to
 * move beyond the buffers.
 */
backword(f, n)
{
        if (n < 0)
                return (forwword(f, -n));
        if (backchar(FALSE, 1) == FALSE)
                return (FALSE);
        while (n--) {
                while (inword() == FALSE) {
                        if (backchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
                while (inword() != FALSE) {
                        if (backchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
        }
        return (forwchar(FALSE, 1));
}

/*
 * Move the cursor forward by the specified number of words. All of the motion
 * is done by "forwchar". Error if you try and move beyond the buffer's end.
 */
forwword(f, n)
{
        if (n < 0)
                return (backword(f, -n));
        while (n--) {
#if	NFWORD
                while (inword() != FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
#endif
                while (inword() == FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
#if	NFWORD == 0
                while (inword() != FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
#endif
        }
	return(TRUE);
}

/*
 * Move the cursor forward by the specified number of words. As you move,
 * convert any characters to upper case. Error if you try and move beyond the
 * end of the buffer. Bound to "M-U".
 */
upperword(f, n)
{
        register int    c;

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
        if (n < 0)
                return (FALSE);
        while (n--) {
                while (inword() == FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
                while (inword() != FALSE) {
                        c = lgetc(curwp->w_dotp, curwp->w_doto);
                        if (c>='a' && c<='z') {
                                c -= 'a'-'A';
                                lputc(curwp->w_dotp, curwp->w_doto, c);
                                lchange(WFHARD);
                        }
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
        }
        return (TRUE);
}

/*
 * Move the cursor forward by the specified number of words. As you move
 * convert characters to lower case. Error if you try and move over the end of
 * the buffer. Bound to "M-L".
 */
lowerword(f, n)
{
        register int    c;

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
        if (n < 0)
                return (FALSE);
        while (n--) {
                while (inword() == FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
                while (inword() != FALSE) {
                        c = lgetc(curwp->w_dotp, curwp->w_doto);
                        if (c>='A' && c<='Z') {
                                c += 'a'-'A';
                                lputc(curwp->w_dotp, curwp->w_doto, c);
                                lchange(WFHARD);
                        }
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
        }
        return (TRUE);
}

/*
 * Move the cursor forward by the specified number of words. As you move
 * convert the first character of the word to upper case, and subsequent
 * characters to lower case. Error if you try and move past the end of the
 * buffer. Bound to "M-C".
 */
capword(f, n)
{
        register int    c;

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
        if (n < 0)
                return (FALSE);
        while (n--) {
                while (inword() == FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                }
                if (inword() != FALSE) {
                        c = lgetc(curwp->w_dotp, curwp->w_doto);
                        if (c>='a' && c<='z') {
                                c -= 'a'-'A';
                                lputc(curwp->w_dotp, curwp->w_doto, c);
                                lchange(WFHARD);
                        }
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                        while (inword() != FALSE) {
                                c = lgetc(curwp->w_dotp, curwp->w_doto);
                                if (c>='A' && c<='Z') {
                                        c += 'a'-'A';
                                        lputc(curwp->w_dotp, curwp->w_doto, c);
                                        lchange(WFHARD);
                                }
                                if (forwchar(FALSE, 1) == FALSE)
                                        return (FALSE);
                        }
                }
        }
        return (TRUE);
}

/*
 * Kill forward by "n" words. Remember the location of dot. Move forward by
 * the right number of words. Put dot back where it was and issue the kill
 * command for the right number of characters. Bound to "M-D".
 */
delfword(f, n)
{
        register int    size;
        register LINE   *dotp;
        register int    doto;

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
        if (n < 0)
                return (FALSE);
        dotp = curwp->w_dotp;
        doto = curwp->w_doto;
        size = 0;
        while (n--) {
#if	NFWORD
		while (inword() != FALSE) {
			if (forwchar(FALSE,1) == FALSE)
				return(FALSE);
			++size;
		}
#endif
                while (inword() == FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                        ++size;
                }
#if	NFWORD == 0
                while (inword() != FALSE) {
                        if (forwchar(FALSE, 1) == FALSE)
                                return (FALSE);
                        ++size;
                }
#endif
        }
        curwp->w_dotp = dotp;
        curwp->w_doto = doto;
        return (ldelete(size, TRUE));
}

/*
 * Kill backwards by "n" words. Move backwards by the desired number of words,
 * counting the characters. When dot is finally moved to its resting place,
 * fire off the kill command. Bound to "M-Rubout" and to "M-Backspace".
 */
delbword(f, n)
{
        register int    size;

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
        if (n < 0)
                return (FALSE);
        if (backchar(FALSE, 1) == FALSE)
                return (FALSE);
        size = 0;
        while (n--) {
                while (inword() == FALSE) {
                        if (backchar(FALSE, 1) == FALSE)
                                return (FALSE);
                        ++size;
                }
                while (inword() != FALSE) {
                        if (backchar(FALSE, 1) == FALSE)
                                return (FALSE);
                        ++size;
                }
        }
        if (forwchar(FALSE, 1) == FALSE)
                return (FALSE);
        return (ldelete(size, TRUE));
}

/*
 * Return TRUE if the character at dot is a character that is considered to be
 * part of a word. The word character list is hard coded. Should be setable.
 */
inword()
{
        register int    c;

        if (curwp->w_doto == llength(curwp->w_dotp))
                return (FALSE);
        c = lgetc(curwp->w_dotp, curwp->w_doto);
        if (c>='a' && c<='z')
                return (TRUE);
        if (c>='A' && c<='Z')
                return (TRUE);
        if (c>='0' && c<='9')
                return (TRUE);
        if (c=='$' || c=='_')                   /* For identifiers      */
                return (TRUE);
        return (FALSE);
}

fillpara(f, n)	/* Fill the current paragraph according to the current
		   fill column						*/

int f, n;	/* deFault flag and Numeric argument */

{
	register int c;			/* current char durring scan	*/
	register int wordlen;		/* length of current word	*/
	register int clength;		/* position on line during fill	*/
	register int i;			/* index during word copy	*/
	register int newlength;		/* tentative new line length	*/
	register int eopflag;		/* Are we at the End-Of-Paragraph? */
	register int firstflag;		/* first word? (needs no space)	*/
	register LINE *eopline;		/* pointer to line just past EOP */
	register int dotflag;		/* was the last char a period?	*/
	char wbuf[NSTRING];		/* buffer for current word	*/

	if (curbp->b_mode&MDVIEW)	/* don't allow this command if	*/
		return(rdonly());	/* we are in read only mode	*/
	if (fillcol == 0) {	/* no fill column set */
		mlwrite("No fill column set");
		return(FALSE);
	}

	/* record the pointer to the line just past the EOP */
	gotoeop(FALSE, 1);
	eopline = lforw(curwp->w_dotp);

	/* and back top the begining of the paragraph */
	gotobop(FALSE, 1);

	/* initialize various info */
	clength = curwp->w_doto;
	if (clength && curwp->w_dotp->l_text[0] == TAB)
		clength = 8;
	wordlen = 0;
	dotflag = FALSE;

	/* scan through lines, filling words */
	firstflag = TRUE;
	eopflag = FALSE;
	while (!eopflag) {
		/* get the next character in the paragraph */
		if (curwp->w_doto == llength(curwp->w_dotp)) {
			c = ' ';
			if (lforw(curwp->w_dotp) == eopline)
				eopflag = TRUE;
		} else
			c = lgetc(curwp->w_dotp, curwp->w_doto);

		/* and then delete it */
		ldelete(1, FALSE);

		/* if not a separator, just add it in */
		if (c != ' ' && c != '	') {
			dotflag = (c == '.');		/* was it a dot */
			if (wordlen < NSTRING - 1)
				wbuf[wordlen++] = c;
		} else if (wordlen) {
			/* at a word break with a word waiting */
			/* calculate tantitive new length with word added */
			newlength = clength + 1 + wordlen;
			if (newlength <= fillcol) {
				/* add word to current line */
				if (!firstflag) {
					linsert(1, ' '); /* the space */
					++clength;
				}
				firstflag = FALSE;
			} else {
				/* start a new line */
				lnewline();
				clength = 0;
			}

			/* and add the word in in either case */
			for (i=0; i<wordlen; i++) {
				linsert(1, wbuf[i]);
				++clength;
			}
			if (dotflag) {
				linsert(1, ' ');
				++clength;
			}
			wordlen = 0;
		}
	}
	/* and add a last newline for the end of our new paragraph */
	lnewline();
}

killpara(f, n)	/* delete n paragraphs starting with the current one */

int f;	/* default flag */
int n;	/* # of paras to delete */

{
	register int status;	/* returned status of functions */

	while (n--) {		/* for each paragraph to delete */

		/* mark out the end and begining of the para to delete */
		gotoeop(FALSE, 1);

		/* set the mark here */
	        curwp->w_markp = curwp->w_dotp;
	        curwp->w_marko = curwp->w_doto;

		/* go to the begining of the paragraph */
		gotobop(FALSE, 1);
		curwp->w_doto = 0;	/* force us to the begining of line */
	
		/* and delete it */
		if ((status = killregion(FALSE, 1)) != TRUE)
			return(status);

		/* and clean up the 2 extra lines */
		ldelete(2, TRUE);
	}
	return(TRUE);
}