summaryrefslogtreecommitdiff
path: root/mail/z.c
blob: d0242cce586f34c9fdfd342a6df9234c328616d0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.

   GNU Mailutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GNU Mailutils is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GNU Mailutils; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA  */

#include "mail.h"

/* Scroll directions */
#define D_BWD  -1 /* z- */
#define D_NONE 0  /* z. */
#define D_FWD  1  /* z+ */

/*
 * z [+|-|. [count]]
 * Optional [count] specifies number of pages to skip before
 * displaying from lines. Default is 1.
 * . modifier causes command to redisplay the current page, i.e.
 * starting from the current message.
 */

static int
z_parse_args(int argc, char **argv,
	     unsigned int *return_count, int *return_dir)
{
  int count = 1;
  int mul = 1;
  int dir = D_FWD;
  int an = 0;
  char *argp = NULL;

  argp = &argv[an][1];
  if (*argp == 0)
    {
      an++;
      if (an < argc)
	argp = argv[an];
    }

  if (*argp)
    {
      switch (*argp++)
       {
       case '+':
	 break;
       case '-':
	 dir = D_BWD;
	 break;
       case '.':
	 dir = D_NONE;
	 break;
       default:
	 util_error (_("Bad arguments for the scrolling command"));
	 return 1;
       }

      if (*argp == 0)
	{
	  an++;
	  if (an < argc)
	    argp = argv[an];
	}

      argc -= an;

      if (argc > 1)
	{
	  util_error (_("Too many arguments for the scrolling command"));
	  return 1;
	}

      if (argp && *argp)
	{
	  if (dir == D_NONE)
	    {
	      util_error (_("Argument not applicable for z"));
	      return 1;
	    }

	  if ((mul = strtoul (argp, NULL, 10)) == 0)
	    {
	      util_error (_("Bad number of pages"));
	      return 1;
	    }
	}

   }

 *return_count = mul * count;
 *return_dir = dir;

 return 0;
}

int
mail_z (int argc, char **argv)
{
  unsigned int i, nlines;
  unsigned int pagelines = util_screen_lines();
  unsigned int count;
  int dir;
  int crs, end;
  
  if (z_parse_args(argc, argv, &count, &dir))
    return 1;

  nlines = pagelines;

  count *= pagelines;
  crs = cursor;
  switch (dir)
    {
    case D_BWD:
      if (crs < nlines)
	{
	  fprintf (stdout, _("On first screenful of messages\n"));
	  return 0;
	}
      if (crs < count)
	crs = 1;
      else
	crs -= count;
      break;

    case D_FWD:
      if (crs + pagelines > total)
	{
	  fprintf (stdout, _("On last screenful of messages\n"));
	  return 0;
	}

      crs += count;

      if (crs + nlines > total)
	nlines = total - crs + 1;

      if (nlines <= 0)
	{
	  fprintf (stdout, _("On last screenful of messages\n"));
	  return 0;
	}
      break;

    case D_NONE:
      {
	/* z. is a GNU extension, so it will be more useful
	   when we reach the last message to show a full screen
	   of the last message.  This behaviour is used on startup
	   when displaying the summary and the headers, new messages
	   are last but we want to display a screenful with the
	   real crs set by summary() to the new message.  */

	/* Find the start of the last screen page.  */
	int lastpage =  total - pagelines + 1;
	if (lastpage <= 0)
	  lastpage = 1;

	if (crs > (unsigned int)lastpage)
	  {
	    crs = lastpage;

	    if (crs + nlines > total)
	      nlines = total - crs;

	    util_range_msg (crs, crs + nlines,
			    MSG_NODELETED|MSG_SILENT, mail_from0, NULL);
	    return 1;
	  }
	else if (crs + nlines > total)
	  nlines = total - crs + 1;
      }
      break;
    }

  cursor = crs;
  end = cursor + nlines - 1;
  i = 0;
  do
    {
      int cnt = util_range_msg (crs, end,
				MSG_NODELETED|MSG_SILENT, mail_from0, NULL);
      if (cnt == 0)
	break;
      i += cnt;
      crs += nlines;
    }
  while (i < nlines && crs <= total);

  return 1;
}

Return to:

Send suggestions and report system problems to the System administrator.