1 /* $OpenBSD: paragraph.c,v 1.22 2011/11/29 05:59:54 lum Exp $ */ 2 3 /* This file is in the public domain. */ 4 5 /* 6 * Code for dealing with paragraphs and filling. Adapted from MicroEMACS 3.6 7 * and GNU-ified by mwm@ucbvax. Several bug fixes by blarson@usc-oberon. 8 */ 9 10 #include "def.h" 11 12 static int fillcol = 70; 13 14 #define MAXWORD 256 15 16 /* 17 * Move to start of paragraph. Go back to the beginning of the current 18 * paragraph here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE> 19 * combination to delimit the beginning of a paragraph. 20 */ 21 /* ARGSUSED */ 22 int 23 gotobop(int f, int n) 24 { 25 /* the other way... */ 26 if (n < 0) 27 return (gotoeop(f, -n)); 28 29 while (n-- > 0) { 30 /* first scan back until we are in a word */ 31 while (backchar(FFRAND, 1) && inword() == 0); 32 33 /* and go to the B-O-Line */ 34 curwp->w_doto = 0; 35 36 /* 37 * and scan back until we hit a <NL><SP> <NL><TAB> or 38 * <NL><NL> 39 */ 40 while (lback(curwp->w_dotp) != curbp->b_headp) 41 if (llength(lback(curwp->w_dotp)) && 42 lgetc(curwp->w_dotp, 0) != ' ' && 43 lgetc(curwp->w_dotp, 0) != '.' && 44 lgetc(curwp->w_dotp, 0) != '\t') 45 curwp->w_dotp = lback(curwp->w_dotp); 46 else { 47 if (llength(lback(curwp->w_dotp)) && 48 lgetc(curwp->w_dotp, 0) == '.') { 49 curwp->w_dotp = lforw(curwp->w_dotp); 50 if (curwp->w_dotp == curbp->b_headp) { 51 /* 52 * beyond end of buffer, 53 * cleanup time 54 */ 55 curwp->w_dotp = 56 lback(curwp->w_dotp); 57 curwp->w_doto = 58 llength(curwp->w_dotp); 59 } 60 } 61 break; 62 } 63 } 64 /* force screen update */ 65 curwp->w_rflag |= WFMOVE; 66 return (TRUE); 67 } 68 69 /* 70 * Move to end of paragraph. Go forward to the end of the current paragraph 71 * here we look for a <NL><NL> or <NL><TAB> or <NL><SPACE> combination to 72 * delimit the beginning of a paragraph. 73 */ 74 /* ARGSUSED */ 75 int 76 gotoeop(int f, int n) 77 { 78 /* the other way... */ 79 if (n < 0) 80 return (gotobop(f, -n)); 81 82 /* for each one asked for */ 83 while (n-- > 0) { 84 /* Find the first word on/after the current line */ 85 curwp->w_doto = 0; 86 while (forwchar(FFRAND, 1) && inword() == 0); 87 88 curwp->w_doto = 0; 89 curwp->w_dotp = lforw(curwp->w_dotp); 90 91 /* and scan forword until we hit a <NL><SP> or ... */ 92 while (curwp->w_dotp != curbp->b_headp) { 93 if (llength(curwp->w_dotp) && 94 lgetc(curwp->w_dotp, 0) != ' ' && 95 lgetc(curwp->w_dotp, 0) != '.' && 96 lgetc(curwp->w_dotp, 0) != '\t') 97 curwp->w_dotp = lforw(curwp->w_dotp); 98 else 99 break; 100 } 101 if (curwp->w_dotp == curbp->b_headp) { 102 /* beyond end of buffer, cleanup time */ 103 curwp->w_dotp = lback(curwp->w_dotp); 104 curwp->w_doto = llength(curwp->w_dotp); 105 break; 106 } 107 } 108 /* force screen update */ 109 curwp->w_rflag |= WFMOVE; 110 return (TRUE); 111 } 112 113 /* 114 * Justify a paragraph. Fill the current paragraph according to the current 115 * fill column. 116 */ 117 /* ARGSUSED */ 118 int 119 fillpara(int f, int n) 120 { 121 int c; /* current char during scan */ 122 int wordlen; /* length of current word */ 123 int clength; /* position on line during fill */ 124 int i; /* index during word copy */ 125 int eopflag; /* Are we at the End-Of-Paragraph? */ 126 int firstflag; /* first word? (needs no space) */ 127 int newlength; /* tentative new line length */ 128 int eolflag; /* was at end of line */ 129 int retval; /* return value */ 130 struct line *eopline; /* pointer to line just past EOP */ 131 char wbuf[MAXWORD]; /* buffer for current word */ 132 133 undo_boundary_enable(FFRAND, 0); 134 135 /* record the pointer to the line just past the EOP */ 136 (void)gotoeop(FFRAND, 1); 137 if (curwp->w_doto != 0) { 138 /* paragraph ends at end of buffer */ 139 (void)lnewline(); 140 eopline = lforw(curwp->w_dotp); 141 } else 142 eopline = curwp->w_dotp; 143 144 /* and back top the begining of the paragraph */ 145 (void)gotobop(FFRAND, 1); 146 147 /* initialize various info */ 148 while (inword() == 0 && forwchar(FFRAND, 1)); 149 150 clength = curwp->w_doto; 151 wordlen = 0; 152 153 /* scan through lines, filling words */ 154 firstflag = TRUE; 155 eopflag = FALSE; 156 while (!eopflag) { 157 158 /* get the next character in the paragraph */ 159 if ((eolflag = (curwp->w_doto == llength(curwp->w_dotp)))) { 160 c = ' '; 161 if (lforw(curwp->w_dotp) == eopline) 162 eopflag = TRUE; 163 } else 164 c = lgetc(curwp->w_dotp, curwp->w_doto); 165 166 /* and then delete it */ 167 if (ldelete((RSIZE) 1, KNONE) == FALSE && !eopflag) { 168 retval = FALSE; 169 goto cleanup; 170 } 171 172 /* if not a separator, just add it in */ 173 if (c != ' ' && c != '\t') { 174 if (wordlen < MAXWORD - 1) 175 wbuf[wordlen++] = c; 176 else { 177 /* 178 * You lose chars beyond MAXWORD if the word 179 * is too long. I'm too lazy to fix it now; it 180 * just silently truncated the word before, 181 * so I get to feel smug. 182 */ 183 ewprintf("Word too long!"); 184 } 185 } else if (wordlen) { 186 187 /* calculate tentative new length with word added */ 188 newlength = clength + 1 + wordlen; 189 190 /* 191 * if at end of line or at doublespace and previous 192 * character was one of '.','?','!' doublespace here. 193 * behave the same way if a ')' is preceded by a 194 * [.?!] and followed by a doublespace. 195 */ 196 if ((eolflag || 197 curwp->w_doto == llength(curwp->w_dotp) || 198 (c = lgetc(curwp->w_dotp, curwp->w_doto)) == ' ' 199 || c == '\t') && (ISEOSP(wbuf[wordlen - 1]) || 200 (wbuf[wordlen - 1] == ')' && wordlen >= 2 && 201 ISEOSP(wbuf[wordlen - 2]))) && 202 wordlen < MAXWORD - 1) 203 wbuf[wordlen++] = ' '; 204 205 /* at a word break with a word waiting */ 206 if (newlength <= fillcol) { 207 /* add word to current line */ 208 if (!firstflag) { 209 (void)linsert(1, ' '); 210 ++clength; 211 } 212 firstflag = FALSE; 213 } else { 214 if (curwp->w_doto > 0 && 215 lgetc(curwp->w_dotp, curwp->w_doto - 1) == ' ') { 216 curwp->w_doto -= 1; 217 (void)ldelete((RSIZE) 1, KNONE); 218 } 219 /* start a new line */ 220 (void)lnewline(); 221 clength = 0; 222 } 223 224 /* and add the word in in either case */ 225 for (i = 0; i < wordlen; i++) { 226 (void)linsert(1, wbuf[i]); 227 ++clength; 228 } 229 wordlen = 0; 230 } 231 } 232 /* and add a last newline for the end of our new paragraph */ 233 (void)lnewline(); 234 235 /* 236 * We really should wind up where we started, (which is hard to keep 237 * track of) but I think the end of the last line is better than the 238 * beginning of the blank line. 239 */ 240 (void)backchar(FFRAND, 1); 241 retval = TRUE; 242 cleanup: 243 undo_boundary_enable(FFRAND, 1); 244 return (retval); 245 } 246 247 /* 248 * Delete a paragraph. Delete n paragraphs starting with the current one. 249 */ 250 /* ARGSUSED */ 251 int 252 killpara(int f, int n) 253 { 254 int status; /* returned status of functions */ 255 256 /* for each paragraph to delete */ 257 while (n--) { 258 259 /* mark out the end and beginning of the para to delete */ 260 (void)gotoeop(FFRAND, 1); 261 262 /* set the mark here */ 263 curwp->w_markp = curwp->w_dotp; 264 curwp->w_marko = curwp->w_doto; 265 266 /* go to the beginning of the paragraph */ 267 (void)gotobop(FFRAND, 1); 268 269 /* force us to the beginning of line */ 270 curwp->w_doto = 0; 271 272 /* and delete it */ 273 if ((status = killregion(FFRAND, 1)) != TRUE) 274 return (status); 275 276 /* and clean up the 2 extra lines */ 277 (void)ldelete((RSIZE) 1, KFORW); 278 } 279 return (TRUE); 280 } 281 282 /* 283 * Insert char with work wrap. Check to see if we're past fillcol, and if so, 284 * justify this line. As a last step, justify the line. 285 */ 286 /* ARGSUSED */ 287 int 288 fillword(int f, int n) 289 { 290 char c; 291 int col, i, nce; 292 293 for (i = col = 0; col <= fillcol; ++i, ++col) { 294 if (i == curwp->w_doto) 295 return selfinsert(f, n); 296 c = lgetc(curwp->w_dotp, i); 297 if (c == '\t' 298 #ifdef NOTAB 299 && !(curbp->b_flag & BFNOTAB) 300 #endif 301 ) 302 col |= 0x07; 303 else if (ISCTRL(c) != FALSE) 304 ++col; 305 } 306 if (curwp->w_doto != llength(curwp->w_dotp)) { 307 (void)selfinsert(f, n); 308 nce = llength(curwp->w_dotp) - curwp->w_doto; 309 } else 310 nce = 0; 311 curwp->w_doto = i; 312 313 if ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && c != '\t') 314 do { 315 (void)backchar(FFRAND, 1); 316 } while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && 317 c != '\t' && curwp->w_doto > 0); 318 319 if (curwp->w_doto == 0) 320 do { 321 (void)forwchar(FFRAND, 1); 322 } while ((c = lgetc(curwp->w_dotp, curwp->w_doto)) != ' ' && 323 c != '\t' && curwp->w_doto < llength(curwp->w_dotp)); 324 325 (void)delwhite(FFRAND, 1); 326 (void)lnewline(); 327 i = llength(curwp->w_dotp) - nce; 328 curwp->w_doto = i > 0 ? i : 0; 329 curwp->w_rflag |= WFMOVE; 330 if (nce == 0 && curwp->w_doto != 0) 331 return (fillword(f, n)); 332 return (TRUE); 333 } 334 335 /* 336 * Set fill column to n for justify. 337 */ 338 int 339 setfillcol(int f, int n) 340 { 341 char buf[32], *rep; 342 const char *es; 343 int nfill; 344 345 if ((f & FFARG) != 0) { 346 fillcol = n; 347 } else { 348 if ((rep = eread("Set fill-column: ", buf, sizeof(buf), 349 EFNEW | EFCR)) == NULL) 350 return (ABORT); 351 else if (rep[0] == '\0') 352 return (FALSE); 353 nfill = strtonum(rep, 0, INT_MAX, &es); 354 if (es != NULL) { 355 ewprintf("Invalid fill column: %s", rep); 356 return (FALSE); 357 } 358 fillcol = nfill; 359 ewprintf("Fill column set to %d", fillcol); 360 } 361 return (TRUE); 362 } 363