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 #include <sys/types.h>
13 #include <sys/queue.h>
14 #include <sys/time.h>
15
16 #include <bitstring.h>
17 #include <limits.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21
22 #include "../common/common.h"
23
24 enum which {RETAB, LEFT, RIGHT};
25 static int shift(SCR *, EXCMD *, enum which);
26
27 /*
28 * ex_shiftl -- :<[<...]
29 *
30 *
31 * PUBLIC: int ex_shiftl(SCR *, EXCMD *);
32 */
33 int
ex_shiftl(SCR * sp,EXCMD * cmdp)34 ex_shiftl(SCR *sp, EXCMD *cmdp)
35 {
36 return (shift(sp, cmdp, LEFT));
37 }
38
39 /*
40 * ex_shiftr -- :>[>...]
41 *
42 * PUBLIC: int ex_shiftr(SCR *, EXCMD *);
43 */
44 int
ex_shiftr(SCR * sp,EXCMD * cmdp)45 ex_shiftr(SCR *sp, EXCMD *cmdp)
46 {
47 return (shift(sp, cmdp, RIGHT));
48 }
49
50 /*
51 * ex_retab -- Expand tabs (if enabled)
52 *
53 *
54 * PUBLIC: int ex_retab(SCR *, EXCMD *);
55 */
56 int
ex_retab(SCR * sp,EXCMD * cmdp)57 ex_retab(SCR *sp, EXCMD *cmdp)
58 {
59 return (shift(sp, cmdp, RETAB));
60 }
61
62 /*
63 * shift --
64 * Ex shift support.
65 */
66 static int
shift(SCR * sp,EXCMD * cmdp,enum which rl)67 shift(SCR *sp, EXCMD *cmdp, enum which rl)
68 {
69 recno_t from, to;
70 size_t blen, len, newcol, newidx, oldcol, oldidx, sw;
71 int curset;
72 CHAR_T *p;
73 CHAR_T *bp, *tbp;
74
75 NEEDFILE(sp, cmdp);
76
77 if (O_VAL(sp, O_SHIFTWIDTH) == 0) {
78 msgq(sp, M_INFO, "152|shiftwidth option set to 0");
79 return (0);
80 }
81
82 /* Copy the lines being shifted into the unnamed buffer. */
83 if (cut(sp, NULL, &cmdp->addr1, &cmdp->addr2, CUT_LINEMODE))
84 return (1);
85
86 /*
87 * The historic version of vi permitted the user to string any number
88 * of '>' or '<' characters together, resulting in an indent of the
89 * appropriate levels. There's a special hack in ex_cmd() so that
90 * cmdp->argv[0] points to the string of '>' or '<' characters.
91 *
92 * Q: What's the difference between the people adding features
93 * to vi and the Girl Scouts?
94 * A: The Girl Scouts have mint cookies and adult supervision.
95 */
96 for (p = cmdp->argv[0]->bp, sw = 0; *p == '>' || *p == '<'; ++p)
97 sw += O_VAL(sp, O_SHIFTWIDTH);
98
99 GET_SPACE_RETW(sp, bp, blen, 256);
100
101 curset = 0;
102 for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
103 if (db_get(sp, from, DBG_FATAL, &p, &len))
104 goto err;
105 if (!len) {
106 if (sp->lno == from)
107 curset = 1;
108 continue;
109 }
110
111 /*
112 * Calculate the old indent amount and the number of
113 * characters it used.
114 */
115 for (oldidx = 0, oldcol = 0; oldidx < len; ++oldidx)
116 if (p[oldidx] == ' ')
117 ++oldcol;
118 else if (p[oldidx] == '\t')
119 oldcol += O_VAL(sp, O_TABSTOP) -
120 oldcol % O_VAL(sp, O_TABSTOP);
121 else
122 break;
123
124 /* Calculate the new indent amount. */
125 if (rl == RETAB)
126 newcol = oldcol;
127 else if (rl == RIGHT)
128 newcol = oldcol + sw;
129 else {
130 newcol = oldcol < sw ? 0 : oldcol - sw;
131 if (newcol == oldcol) {
132 if (sp->lno == from)
133 curset = 1;
134 continue;
135 }
136 }
137
138 /* Get a buffer that will hold the new line. */
139 ADD_SPACE_RETW(sp, bp, blen, newcol + len);
140
141 /*
142 * Build a new indent string and count the number of
143 * characters it uses.
144 */
145 tbp = bp;
146 newidx = 0;
147 if (!O_ISSET(sp, O_EXPANDTAB)) {
148 for (; newcol >= O_VAL(sp, O_TABSTOP); ++newidx) {
149 *tbp++ = '\t';
150 newcol -= O_VAL(sp, O_TABSTOP);
151 }
152 }
153 for (; newcol > 0; --newcol, ++newidx)
154 *tbp++ = ' ';
155
156 /* Add the original line. */
157 MEMCPY(tbp, p + oldidx, len - oldidx);
158
159 /* Set the replacement line. */
160 if (db_set(sp, from, bp, (tbp + (len - oldidx)) - bp)) {
161 err: FREE_SPACEW(sp, bp, blen);
162 return (1);
163 }
164
165 /*
166 * !!!
167 * The shift command in historic vi had the usual bizarre
168 * collection of cursor semantics. If called from vi, the
169 * cursor was repositioned to the first non-blank character
170 * of the lowest numbered line shifted. If called from ex,
171 * the cursor was repositioned to the first non-blank of the
172 * highest numbered line shifted. Here, if the cursor isn't
173 * part of the set of lines that are moved, move it to the
174 * first non-blank of the last line shifted. (This makes
175 * ":3>>" in vi work reasonably.) If the cursor is part of
176 * the shifted lines, it doesn't get moved at all. This
177 * permits shifting of marked areas, i.e. ">'a." shifts the
178 * marked area twice, something that couldn't be done with
179 * historic vi.
180 */
181 if (sp->lno == from) {
182 curset = 1;
183 if (newidx > oldidx)
184 sp->cno += newidx - oldidx;
185 else if (sp->cno >= oldidx - newidx)
186 sp->cno -= oldidx - newidx;
187 }
188 }
189 if (!curset) {
190 sp->lno = to;
191 sp->cno = 0;
192 (void)nonblank(sp, to, &sp->cno);
193 }
194
195 FREE_SPACEW(sp, bp, blen);
196
197 sp->rptlines[L_SHIFT] += cmdp->addr2.lno - cmdp->addr1.lno + 1;
198 return (0);
199 }
200