summaryrefslogtreecommitdiff
path: root/mail/z.c
blob: a124cbe80cab2134c9a52bee0ff903bd18605077 (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
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999, 2001, 2002, 2005, 2007, 2010 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 3, 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., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 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,
	     off_t *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)
{
  off_t count;
  int dir;
  unsigned int pagelines = util_screen_lines ();

  if (z_parse_args(argc, argv, &count, &dir))
    return 1;

  count *= pagelines;

  switch (dir)
    {
    case D_BWD:
      if (page_move (-count) == 0)
	{
	  fprintf (stdout, _("On first screenful of messages\n"));
	  return 0;
	}
      break;

    case D_FWD:
      if (page_move (count) == 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.
	   FIXME: Basically it's the same as headers now. Do we need
	   it still? */
	break;
      }
    }

  page_do (mail_from0, NULL);
  return 0;
}

Return to:

Send suggestions and report system problems to the System administrator.