/* $OpenBSD: paragraph.c,v 1.29 2013/06/15 19:58:39 lum Exp $ */ /* This file is in the public domain. */ /* * Code for dealing with paragraphs and filling. Adapted from MicroEMACS 3.6 * and GNU-ified by mwm@ucbvax. Several bug fixes by blarson@usc-oberon. */ #include #include "def.h" static int fillcol = 70; #define MAXWORD 256 /* * Move to start of paragraph. * Move backwards by line, checking from the 1st character forwards for the * existence a non-space. If a non-space character is found, move to the * preceding line. Keep doing this until a line with only spaces is found or * the start of buffer. */ /* ARGSUSED */ int gotobop(int f, int n) { int col, nospace; /* the other way... */ if (n < 0) return (gotoeop(f, -n)); while (n-- > 0) { while (lback(curwp->w_dotp) != curbp->b_headp) { curwp->w_dotp = lback(curwp->w_dotp); curwp->w_dotline--; curwp->w_doto = 0; col = 0; while (col < llength(curwp->w_dotp) && (isspace(lgetc(curwp->w_dotp, col)))) col++; if (col >= llength(curwp->w_dotp)) { if (nospace) break; } else nospace = 1; } nospace = 0; } /* force screen update */ curwp->w_rflag |= WFMOVE; return (TRUE); } /* * Move to end of paragraph. * See comments for gotobop(). Same, but moving forwards. */ /* ARGSUSED */ int gotoeop(int f, int n) { int col, nospace; /* the other way... */ if (n < 0) return (gotobop(f, -n)); /* for each one asked for */ while (n-- > 0) { while (lforw(curwp->w_dotp) != curbp->b_headp) { col = 0; curwp->w_doto = 0; while (col < llength(curwp->w_dotp) && (isspace(lgetc(curwp->w_dotp, col)))) col++; if (col >= llength(curwp->w_dotp)) { if (nospace) break; } else nospace = 1; curwp->w_dotp = lforw(curwp->w_dotp); curwp->w_dotline++; } nospace = 0; } /* force screen update */ curwp->w_rflag |= WFMOVE; return (TRUE); } /* * Justify a paragraph. Fill the current paragraph according to the current * fill column. */ /* ARGSUSED */ int fillpara(int f, int n) { int c; /* current char during scan */ int wordlen; /* length of current word */ int clength; /* position on line during fill */ int i; /* index during word copy */ int eopflag; /* Are we at the End-Of-Paragraph? */ int firstflag; /* first word? (needs no space) */ int newlength; /* tentative new line length */ int eolflag; /* was at end of line */ int retval; /* return value */ struct line *eopline; /* pointer to line just past EOP */ char wbuf[MAXWORD]; /* buffer for current word */ undo_boundary_enable(FFRAND, 0); /* record the pointer to the line just past the EOP */ (void)gotoeop(FFRAND, 1); if (curwp->w_doto != 0) { /* paragraph ends at end of buffer */ (void)lnewline(); eopline = lforw(curwp->w_dotp); } else eopline = curwp->w_dotp; /* and back top the begining of the paragraph */ (void)gotobop(FFRAND, 1); /* initialize various info */ while (inword() == 0 && forwchar(FFRAND, 1)); clength = curwp->w_doto; wordlen = 0; /* scan through lines, filling words */ firstflag = TRUE; eopflag = FALSE; while (!eopflag) { /* get the next character in the paragraph */ if ((eolflag = (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 */ if (ldelete((RSIZE) 1, KNONE) == FALSE && !eopflag) { retval = FALSE; goto cleanup; } /* if not a separator, just add it in */ if (c != ' ' && c != '\t') { if (wordlen < MAXWORD - 1) wbuf[wordlen++] = c; else { /* * You lose chars beyond MAXWORD if the word * is too long. I'm too lazy to fix it now; it * just silently truncated the word before, * so I get to feel smug. */ ewprintf("Word too long!"); } } else if (wordlen) { /* calculate tentative new length with word added */ newlength = clength + 1 + wordlen; /* * if at end of line or at doublespace and previous * character was one of '.','?','!' doublespace here. * behave the same way if a ')' is preceded by a * [.?!] and followed by a doublespace. */ if ((eolflag || curwp->w_doto == llength(curwp->w_dotp) || (c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' ' || c == '\t') && (ISEOSP(wbuf[wordlen - 1]) || (wbuf[wordlen - 1] == ')' && wordlen >= 2 && ISEOSP(wbuf[wordlen - 2]))) && wordlen < MAXWORD - 1) wbuf[wordlen++] = ' '; /* at a word break with a word waiting */ if (newlength <= fillcol) { /* add word to current line */ if (!firstflag) { (void)linsert(1, ' '); ++clength; } firstflag = FALSE; } else { if (curwp->w_doto > 0 && lgetc(curwp->w_dotp, curwp->w_doto - 1) == ' ') { curwp->w_doto -= 1; (void)ldelete((RSIZE) 1, KNONE); } /* start a new line */ (void)lnewline(); clength = 0; } /* and add the word in in either case */ for (i = 0; i < wordlen; i++) { (void)linsert(1, wbuf[i]); ++clength; } wordlen = 0; } } /* and add a last newline for the end of our new paragraph */ (void)lnewline(); /* * We really should wind up where we started, (which is hard to keep * track of) but I think the end of the last line is better than the * beginning of the blank line. */ (void)backchar(FFRAND, 1); retval = TRUE; cleanup: undo_boundary_enable(FFRAND, 1); return (retval); } /* * Delete a paragraph. Delete n paragraphs starting with the current one. */ /* ARGSUSED */ int killpara(int f, int n) { int status; /* returned status of functions */ /* for each paragraph to delete */ while (n--) { /* mark out the end and beginning of the para to delete */ (void)gotoeop(FFRAND, 1); /* set the mark here */ curwp->w_markp = curwp->w_dotp; curwp->w_marko = curwp->w_doto; /* go to the beginning of the paragraph */ (void)gotobop(FFRAND, 1); /* force us to the beginning of line */ curwp->w_doto = 0; /* and delete it */ if ((status = killregion(FFRAND, 1)) != TRUE) return (status); } return (TRUE); } /* * Insert char with work wrap. Check to see if we're past fillcol, and if so, * justify this line. As a last step, justify the line. */ /* ARGSUSED */ int fillword(int f, int n) { char c; int col, i, nce; for (i = col = 0; col <= fillcol; ++i, ++col) { if (i == curwp->w_doto) return selfinsert(f, n); c = lgetc(curwp->w_dotp, i); if (c == '\t' #ifdef NOTAB && !(curbp->b_flag & BFNOTAB) #endif ) col |= 0x07; else if (ISCTRL(c) != FALSE) ++col; } if (curwp->w_doto != llength(curwp->w_dotp)) { (void)selfinsert(f, n); nce = llength(curwp->w_dotp) - curwp->w_doto; } else nce = 0; curwp->w_doto = i; if ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && c != '\t') do { (void)backchar(FFRAND, 1); } while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && c != '\t' && curwp->w_doto > 0); if (curwp->w_doto == 0) do { (void)forwchar(FFRAND, 1); } while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && c != '\t' && curwp->w_doto < llength(curwp->w_dotp)); (void)delwhite(FFRAND, 1); (void)lnewline(); i = llength(curwp->w_dotp) - nce; curwp->w_doto = i > 0 ? i : 0; curwp->w_rflag |= WFMOVE; if (nce == 0 && curwp->w_doto != 0) return (fillword(f, n)); return (TRUE); } /* * Set fill column to n for justify. */ int setfillcol(int f, int n) { char buf[32], *rep; const char *es; int nfill; if ((f & FFARG) != 0) { fillcol = n; } else { if ((rep = eread("Set fill-column: ", buf, sizeof(buf), EFNEW | EFCR)) == NULL) return (ABORT); else if (rep[0] == '\0') return (FALSE); nfill = strtonum(rep, 0, INT_MAX, &es); if (es != NULL) { ewprintf("Invalid fill column: %s", rep); return (FALSE); } fillcol = nfill; ewprintf("Fill column set to %d", fillcol); } return (TRUE); }