1 /*- 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1992, 1993, 1994, 1995, 1996 5 * Keith Bostic. All rights reserved. 6 * 7 * See the LICENSE file for redistribution information. 8 */ 9 10 #include "config.h" 11 12 #ifndef lint 13 static const char sccsid[] = "@(#)ex_shift.c 10.11 (Berkeley) 9/15/96"; 14 #endif /* not lint */ 15 16 #include <sys/types.h> 17 #include <sys/queue.h> 18 19 #include <bitstring.h> 20 #include <limits.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 25 #include "../common/common.h" 26 27 enum which {LEFT, RIGHT}; 28 static int shift __P((SCR *, EXCMD *, enum which)); 29 30 /* 31 * ex_shiftl -- :<[<...] 32 * 33 * 34 * PUBLIC: int ex_shiftl __P((SCR *, EXCMD *)); 35 */ 36 int 37 ex_shiftl(sp, cmdp) 38 SCR *sp; 39 EXCMD *cmdp; 40 { 41 return (shift(sp, cmdp, LEFT)); 42 } 43 44 /* 45 * ex_shiftr -- :>[>...] 46 * 47 * PUBLIC: int ex_shiftr __P((SCR *, EXCMD *)); 48 */ 49 int 50 ex_shiftr(sp, cmdp) 51 SCR *sp; 52 EXCMD *cmdp; 53 { 54 return (shift(sp, cmdp, RIGHT)); 55 } 56 57 /* 58 * shift -- 59 * Ex shift support. 60 */ 61 static int 62 shift(sp, cmdp, rl) 63 SCR *sp; 64 EXCMD *cmdp; 65 enum which rl; 66 { 67 recno_t from, to; 68 size_t blen, len, newcol, newidx, oldcol, oldidx, sw; 69 int curset; 70 char *p, *bp, *tbp; 71 72 NEEDFILE(sp, cmdp); 73 74 if (O_VAL(sp, O_SHIFTWIDTH) == 0) { 75 msgq(sp, M_INFO, "152|shiftwidth option set to 0"); 76 return (0); 77 } 78 79 /* Copy the lines being shifted into the unnamed buffer. */ 80 if (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE)) 81 return (1); 82 83 /* 84 * The historic version of vi permitted the user to string any number 85 * of '>' or '<' characters together, resulting in an indent of the 86 * appropriate levels. There's a special hack in ex_cmd() so that 87 * cmdp->argv[0] points to the string of '>' or '<' characters. 88 * 89 * Q: What's the difference between the people adding features 90 * to vi and the Girl Scouts? 91 * A: The Girl Scouts have mint cookies and adult supervision. 92 */ 93 for (p = cmdp->argv[0]->bp, sw = 0; *p == '>' || *p == '<'; ++p) 94 sw += O_VAL(sp, O_SHIFTWIDTH); 95 96 GET_SPACE_RET(sp, bp, blen, 256); 97 98 curset = 0; 99 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) { 100 if (db_get(sp, from, DBG_FATAL, &p, &len)) 101 goto err; 102 if (!len) { 103 if (sp->lno == from) 104 curset = 1; 105 continue; 106 } 107 108 /* 109 * Calculate the old indent amount and the number of 110 * characters it used. 111 */ 112 for (oldidx = 0, oldcol = 0; oldidx < len; ++oldidx) 113 if (p[oldidx] == ' ') 114 ++oldcol; 115 else if (p[oldidx] == '\t') 116 oldcol += O_VAL(sp, O_TABSTOP) - 117 oldcol % O_VAL(sp, O_TABSTOP); 118 else 119 break; 120 121 /* Calculate the new indent amount. */ 122 if (rl == RIGHT) 123 newcol = oldcol + sw; 124 else { 125 newcol = oldcol < sw ? 0 : oldcol - sw; 126 if (newcol == oldcol) { 127 if (sp->lno == from) 128 curset = 1; 129 continue; 130 } 131 } 132 133 /* Get a buffer that will hold the new line. */ 134 ADD_SPACE_RET(sp, bp, blen, newcol + len); 135 136 /* 137 * Build a new indent string and count the number of 138 * characters it uses. 139 */ 140 for (tbp = bp, newidx = 0; 141 newcol >= O_VAL(sp, O_TABSTOP); ++newidx) { 142 *tbp++ = '\t'; 143 newcol -= O_VAL(sp, O_TABSTOP); 144 } 145 for (; newcol > 0; --newcol, ++newidx) 146 *tbp++ = ' '; 147 148 /* Add the original line. */ 149 memcpy(tbp, p + oldidx, len - oldidx); 150 151 /* Set the replacement line. */ 152 if (db_set(sp, from, bp, (tbp + (len - oldidx)) - bp)) { 153 err: FREE_SPACE(sp, bp, blen); 154 return (1); 155 } 156 157 /* 158 * !!! 159 * The shift command in historic vi had the usual bizarre 160 * collection of cursor semantics. If called from vi, the 161 * cursor was repositioned to the first non-blank character 162 * of the lowest numbered line shifted. If called from ex, 163 * the cursor was repositioned to the first non-blank of the 164 * highest numbered line shifted. Here, if the cursor isn't 165 * part of the set of lines that are moved, move it to the 166 * first non-blank of the last line shifted. (This makes 167 * ":3>>" in vi work reasonably.) If the cursor is part of 168 * the shifted lines, it doesn't get moved at all. This 169 * permits shifting of marked areas, i.e. ">'a." shifts the 170 * marked area twice, something that couldn't be done with 171 * historic vi. 172 */ 173 if (sp->lno == from) { 174 curset = 1; 175 if (newidx > oldidx) 176 sp->cno += newidx - oldidx; 177 else if (sp->cno >= oldidx - newidx) 178 sp->cno -= oldidx - newidx; 179 } 180 } 181 if (!curset) { 182 sp->lno = to; 183 sp->cno = 0; 184 (void)nonblank(sp, to, &sp->cno); 185 } 186 187 FREE_SPACE(sp, bp, blen); 188 189 sp->rptlines[L_SHIFT] += cmdp->addr2.lno - cmdp->addr1.lno + 1; 190 return (0); 191 } 192