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.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid
[] = "@(#)ex_shift.c 10.11 (Berkeley) 9/15/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
19 #include <bitstring.h>
25 #include "../common/common.h"
27 enum which
{LEFT
, RIGHT
};
28 static int shift
__P((SCR
*, EXCMD
*, enum which
));
31 * ex_shiftl -- :<[<...]
34 * PUBLIC: int ex_shiftl __P((SCR *, EXCMD *));
41 return (shift(sp
, cmdp
, LEFT
));
45 * ex_shiftr -- :>[>...]
47 * PUBLIC: int ex_shiftr __P((SCR *, EXCMD *));
54 return (shift(sp
, cmdp
, RIGHT
));
68 size_t blen
, len
, newcol
, newidx
, oldcol
, oldidx
, sw
;
74 if (O_VAL(sp
, O_SHIFTWIDTH
) == 0) {
75 msgq(sp
, M_INFO
, "152|shiftwidth option set to 0");
79 /* Copy the lines being shifted into the unnamed buffer. */
80 if (cut(sp
, NULL
, &cmdp
->addr1
, &cmdp
->addr2
, CUT_LINEMODE
))
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.
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.
93 for (p
= cmdp
->argv
[0]->bp
, sw
= 0; *p
== '>' || *p
== '<'; ++p
)
94 sw
+= O_VAL(sp
, O_SHIFTWIDTH
);
96 GET_SPACE_RET(sp
, bp
, blen
, 256);
99 for (from
= cmdp
->addr1
.lno
, to
= cmdp
->addr2
.lno
; from
<= to
; ++from
) {
100 if (db_get(sp
, from
, DBG_FATAL
, &p
, &len
))
109 * Calculate the old indent amount and the number of
110 * characters it used.
112 for (oldidx
= 0, oldcol
= 0; oldidx
< len
; ++oldidx
)
113 if (p
[oldidx
] == ' ')
115 else if (p
[oldidx
] == '\t')
116 oldcol
+= O_VAL(sp
, O_TABSTOP
) -
117 oldcol
% O_VAL(sp
, O_TABSTOP
);
121 /* Calculate the new indent amount. */
123 newcol
= oldcol
+ sw
;
125 newcol
= oldcol
< sw
? 0 : oldcol
- sw
;
126 if (newcol
== oldcol
) {
133 /* Get a buffer that will hold the new line. */
134 ADD_SPACE_RET(sp
, bp
, blen
, newcol
+ len
);
137 * Build a new indent string and count the number of
138 * characters it uses.
140 for (tbp
= bp
, newidx
= 0;
141 newcol
>= O_VAL(sp
, O_TABSTOP
); ++newidx
) {
143 newcol
-= O_VAL(sp
, O_TABSTOP
);
145 for (; newcol
> 0; --newcol
, ++newidx
)
148 /* Add the original line. */
149 memcpy(tbp
, p
+ oldidx
, len
- oldidx
);
151 /* Set the replacement line. */
152 if (db_set(sp
, from
, bp
, (tbp
+ (len
- oldidx
)) - bp
)) {
153 err
: FREE_SPACE(sp
, bp
, blen
);
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
173 if (sp
->lno
== from
) {
176 sp
->cno
+= newidx
- oldidx
;
177 else if (sp
->cno
>= oldidx
- newidx
)
178 sp
->cno
-= oldidx
- newidx
;
184 (void)nonblank(sp
, to
, &sp
->cno
);
187 FREE_SPACE(sp
, bp
, blen
);
189 sp
->rptlines
[L_SHIFT
] += cmdp
->addr2
.lno
- cmdp
->addr1
.lno
+ 1;