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
13static const char sccsid[] = "$Id: ex_join.c,v 10.17 2004/03/16 14:14:04 skimo Exp $";
14#endif /* not lint */
15
16#include <sys/types.h>
17#include <sys/queue.h>
18#include <sys/time.h>
19
20#include <bitstring.h>
21#include <ctype.h>
22#include <limits.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26
27#include "../common/common.h"
28
29/*
30 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
31 *	Join lines.
32 *
33 * PUBLIC: int ex_join __P((SCR *, EXCMD *));
34 */
35int
36ex_join(SCR *sp, EXCMD *cmdp)
37{
38	recno_t from, to;
39	size_t blen, clen, len, tlen;
40	int echar = 0, extra, first;
41	CHAR_T *bp, *tbp = NULL;
42	CHAR_T *p;
43
44	NEEDFILE(sp, cmdp);
45
46	from = cmdp->addr1.lno;
47	to = cmdp->addr2.lno;
48
49	/* Check for no lines to join. */
50	if (!db_exist(sp, from + 1)) {
51		msgq(sp, M_ERR, "131|No following lines to join");
52		return (1);
53	}
54
55	GET_SPACE_RETW(sp, bp, blen, 256);
56
57	/*
58	 * The count for the join command was off-by-one,
59	 * historically, to other counts for other commands.
60	 */
61	if (F_ISSET(cmdp, E_ADDR_DEF) || cmdp->addrcnt == 1)
62		++cmdp->addr2.lno;
63
64	clen = tlen = 0;
65        for (first = 1,
66	    from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
67		/*
68		 * Get next line.  Historic versions of vi allowed "10J" while
69		 * less than 10 lines from the end-of-file, so we do too.
70		 */
71		if (db_get(sp, from, 0, &p, &len)) {
72			cmdp->addr2.lno = from - 1;
73			break;
74		}
75
76		/* Empty lines just go away. */
77		if (len == 0)
78			continue;
79
80		/*
81		 * Get more space if necessary.  Note, tlen isn't the length
82		 * of the new line, it's roughly the amount of space needed.
83		 * tbp - bp is the length of the new line.
84		 */
85		tlen += len + 2;
86		ADD_SPACE_RETW(sp, bp, blen, tlen);
87		tbp = bp + clen;
88
89		/*
90		 * Historic practice:
91		 *
92		 * If force specified, join without modification.
93		 * If the current line ends with whitespace, strip leading
94		 *    whitespace from the joined line.
95		 * If the next line starts with a ), do nothing.
96		 * If the current line ends with ., insert two spaces.
97		 * Else, insert one space.
98		 *
99		 * One change -- add ? and ! to the list of characters for
100		 * which we insert two spaces.  I expect that POSIX 1003.2
101		 * will require this as well.
102		 *
103		 * Echar is the last character in the last line joined.
104		 */
105		extra = 0;
106		if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
107			if (isblank(echar))
108				for (; len && isblank(*p); --len, ++p);
109			else if (p[0] != ')') {
110				if (STRCHR(L(".?!"), echar)) {
111					*tbp++ = ' ';
112					++clen;
113					extra = 1;
114				}
115				*tbp++ = ' ';
116				++clen;
117				for (; len && isblank(*p); --len, ++p);
118			}
119		}
120
121		if (len != 0) {
122			MEMCPY(tbp, p, len);
123			tbp += len;
124			clen += len;
125			echar = p[len - 1];
126		} else
127			echar = ' ';
128
129		/*
130		 * Historic practice for vi was to put the cursor at the first
131		 * inserted whitespace character, if there was one, or the
132		 * first character of the joined line, if there wasn't, or the
133		 * last character of the line if joined to an empty line.  If
134		 * a count was specified, the cursor was moved as described
135		 * for the first line joined, ignoring subsequent lines.  If
136		 * the join was a ':' command, the cursor was placed at the
137		 * first non-blank character of the line unless the cursor was
138		 * "attracted" to the end of line when the command was executed
139		 * in which case it moved to the new end of line.  There are
140		 * probably several more special cases, but frankly, my dear,
141		 * I don't give a damn.  This implementation puts the cursor
142		 * on the first inserted whitespace character, the first
143		 * character of the joined line, or the last character of the
144		 * line regardless.  Note, if the cursor isn't on the joined
145		 * line (possible with : commands), it is reset to the starting
146		 * line.
147		 */
148		if (first) {
149			sp->cno = (tbp - bp) - (1 + extra);
150			first = 0;
151		} else
152			sp->cno = (tbp - bp) - len - (1 + extra);
153	}
154	sp->lno = cmdp->addr1.lno;
155
156	/* Delete the joined lines. */
157        for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
158		if (db_delete(sp, to))
159			goto err;
160
161	/* If the original line changed, reset it. */
162	if (!first && db_set(sp, from, bp, tbp - bp)) {
163err:		FREE_SPACEW(sp, bp, blen);
164		return (1);
165	}
166	FREE_SPACEW(sp, bp, blen);
167
168	sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
169	return (0);
170}
171