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
[] = "$Id: ex_shift.c,v 10.17 2001/06/25 15:19:20 skimo Exp $";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
26 #include "../common/common.h"
28 enum which
{LEFT
, RIGHT
};
29 static int shift(SCR
*, EXCMD
*, enum which
);
32 * ex_shiftl -- :<[<...]
35 * PUBLIC: int ex_shiftl(SCR *, EXCMD *);
38 ex_shiftl(SCR
*sp
, EXCMD
*cmdp
)
40 return (shift(sp
, cmdp
, LEFT
));
44 * ex_shiftr -- :>[>...]
46 * PUBLIC: int ex_shiftr(SCR *, EXCMD *);
49 ex_shiftr(SCR
*sp
, EXCMD
*cmdp
)
51 return (shift(sp
, cmdp
, RIGHT
));
59 shift(SCR
*sp
, EXCMD
*cmdp
, enum which rl
)
62 size_t blen
, len
, newcol
, newidx
, oldcol
, oldidx
, sw
;
69 if (O_VAL(sp
, O_SHIFTWIDTH
) == 0) {
70 msgq(sp
, M_INFO
, "152|shiftwidth option set to 0");
74 /* Copy the lines being shifted into the unnamed buffer. */
75 if (cut(sp
, NULL
, &cmdp
->addr1
, &cmdp
->addr2
, CUT_LINEMODE
))
79 * The historic version of vi permitted the user to string any number
80 * of '>' or '<' characters together, resulting in an indent of the
81 * appropriate levels. There's a special hack in ex_cmd() so that
82 * cmdp->argv[0] points to the string of '>' or '<' characters.
84 * Q: What's the difference between the people adding features
85 * to vi and the Girl Scouts?
86 * A: The Girl Scouts have mint cookies and adult supervision.
88 for (p
= cmdp
->argv
[0]->bp
, sw
= 0; *p
== '>' || *p
== '<'; ++p
)
89 sw
+= O_VAL(sp
, O_SHIFTWIDTH
);
91 GET_SPACE_RETW(sp
, bp
, blen
, 256);
94 for (from
= cmdp
->addr1
.lno
, to
= cmdp
->addr2
.lno
; from
<= to
; ++from
) {
95 if (db_get(sp
, from
, DBG_FATAL
, &p
, &len
))
104 * Calculate the old indent amount and the number of
105 * characters it used.
107 for (oldidx
= 0, oldcol
= 0; oldidx
< len
; ++oldidx
)
108 if (p
[oldidx
] == ' ')
110 else if (p
[oldidx
] == '\t')
111 oldcol
+= O_VAL(sp
, O_TABSTOP
) -
112 oldcol
% O_VAL(sp
, O_TABSTOP
);
116 /* Calculate the new indent amount. */
118 newcol
= oldcol
+ sw
;
120 newcol
= oldcol
< sw
? 0 : oldcol
- sw
;
121 if (newcol
== oldcol
) {
128 /* Get a buffer that will hold the new line. */
129 ADD_SPACE_RETW(sp
, bp
, blen
, newcol
+ len
);
132 * Build a new indent string and count the number of
133 * characters it uses.
135 for (tbp
= bp
, newidx
= 0;
136 newcol
>= O_VAL(sp
, O_TABSTOP
); ++newidx
) {
138 newcol
-= O_VAL(sp
, O_TABSTOP
);
140 for (; newcol
> 0; --newcol
, ++newidx
)
143 /* Add the original line. */
144 MEMCPY(tbp
, p
+ oldidx
, len
- oldidx
);
146 /* Set the replacement line. */
147 if (db_set(sp
, from
, bp
, (tbp
+ (len
- oldidx
)) - bp
)) {
148 err
: FREE_SPACEW(sp
, bp
, blen
);
154 * The shift command in historic vi had the usual bizarre
155 * collection of cursor semantics. If called from vi, the
156 * cursor was repositioned to the first non-blank character
157 * of the lowest numbered line shifted. If called from ex,
158 * the cursor was repositioned to the first non-blank of the
159 * highest numbered line shifted. Here, if the cursor isn't
160 * part of the set of lines that are moved, move it to the
161 * first non-blank of the last line shifted. (This makes
162 * ":3>>" in vi work reasonably.) If the cursor is part of
163 * the shifted lines, it doesn't get moved at all. This
164 * permits shifting of marked areas, i.e. ">'a." shifts the
165 * marked area twice, something that couldn't be done with
168 if (sp
->lno
== from
) {
171 sp
->cno
+= newidx
- oldidx
;
172 else if (sp
->cno
>= oldidx
- newidx
)
173 sp
->cno
-= oldidx
- newidx
;
179 (void)nonblank(sp
, to
, &sp
->cno
);
182 FREE_SPACEW(sp
, bp
, blen
);
184 sp
->rptlines
[L_SHIFT
] += cmdp
->addr2
.lno
- cmdp
->addr1
.lno
+ 1;