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LIMIT.C
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1991-01-11
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static char rcsid[] = "@(#)$Id: limit.c,v 4.1 90/04/28 22:43:21 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 4.1 $ $State: Exp $
*
* Copyright (c) 1986, 1987 Dave Taylor
* Copyright (c) 1988, 1989, 1990 USENET Community Trust
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: limit.c,v $
* Revision 4.1 90/04/28 22:43:21 syd
* checkin of Elm 2.3 as of Release PL0
*
*
******************************************************************************/
/** This stuff is inspired by MH and dmail and is used to 'select'
a subset of the existing mail in the folder based on one of a
number of criteria. The basic tricks are pretty easy - we have
as status of VISIBLE associated with each header stored in the
(er) mind of the computer (!) and simply modify the commands to
check that flag...the global variable `selected' is set to the
number of messages currently selected, or ZERO if no select.
**/
#include "headers.h"
#define TO 1
#define FROM 2
char *shift_lower();
int
limit()
{
/** returns non-zero if we changed selection criteria = need redraw **/
char criteria[STRING], first[STRING], rest[STRING], msg[STRING];
static char prompt[] = "Enter criteria or '?' for help: ";
int last_selected, all;
last_selected = selected;
all = 0;
if (selected) {
PutLine1(LINES-2, 0,
"Already have selection criteria - add more? (y/n) n%c",
BACKSPACE);
criteria[0] = ReadCh();
if (tolower(criteria[0]) == 'y') {
Write_to_screen("Yes.", 0);
PutLine0(LINES-3, COLUMNS-30, "Adding criteria...");
} else {
Write_to_screen("No.", 0);
selected = 0;
PutLine0(LINES-3, COLUMNS-30, "Change criteria...");
}
}
while(1) {
PutLine1(LINES-2, 0, prompt);
CleartoEOLN();
criteria[0] = '\0';
optionally_enter(criteria, LINES-2, strlen(prompt), FALSE, FALSE);
error("");
if (strlen(criteria) == 0) {
/* no change */
selected = last_selected;
return(FALSE);
}
split_word(criteria, first, rest);
if (equal(first, "?")) {
if(last_selected)
error(
"Enter: {\"subject\",\"to\",\"from\"} [pattern] OR \"all\"");
else
error("Enter: {\"subject\",\"to\",\"from\"} [pattern]");
continue;
} else if (equal(first, "all")) {
all++;
selected = 0;
}
else if (equal(first, "subj") || equal(first, "subject"))
selected = limit_selection(SUBJECT, rest, selected);
else if (equal(first, "to"))
selected = limit_selection(TO, rest, selected);
else if (equal(first, "from"))
selected = limit_selection(FROM, rest, selected);
else {
error1("\"%s\" not a valid criterion.", first);
continue;
}
break;
}
if(all && last_selected)
strcpy(msg, "Returned to unlimited display.");
else if(selected)
sprintf(msg, "%d message%s selected.", selected, plural(selected));
else
strcpy(msg, "No messages selected.");
set_error(msg);
/* we need a redraw if there had been a selection or there is now. */
if(last_selected || selected) {
/* if current message won't be on new display, go to first message */
if(selected && !(headers[current-1]->status & VISIBLE))
current = visible_to_index(1)+1;
return(TRUE);
} else {
return(FALSE);
}
}
int
limit_selection(based_on, pattern, additional_criteria)
int based_on, additional_criteria;
char *pattern;
{
/** Given the type of criteria, and the pattern, mark all
non-matching headers as ! VISIBLE. If additional_criteria,
don't mark as visible something that isn't currently!
**/
register int iindex, count = 0;
dprint(2, (debugfile, "\n\n\n**limit on %d - '%s' - (%s) **\n\n",
based_on, pattern, additional_criteria?"add'tl":"base"));
if (based_on == SUBJECT) {
for (iindex = 0; iindex < message_count; iindex++)
if (! in_string(shift_lower(headers[iindex]->subject), pattern))
headers[iindex]->status &= ~VISIBLE;
else if (additional_criteria &&
!(headers[iindex]->status & VISIBLE))
headers[iindex]->status &= ~VISIBLE; /* shut down! */
else { /* mark it as readable */
headers[iindex]->status |= VISIBLE;
count++;
dprint(5, (debugfile,
" Message %d (%s from %s) marked as visible\n",
iindex, headers[iindex]->subject,
headers[iindex]->from));
}
}
else if (based_on == FROM) {
for (iindex = 0; iindex < message_count; iindex++)
if (! in_string(shift_lower(headers[iindex]->from), pattern))
headers[iindex]->status &= ~VISIBLE;
else if (additional_criteria &&
!(headers[iindex]->status & VISIBLE))
headers[iindex]->status &= ~VISIBLE; /* shut down! */
else { /* mark it as readable */
headers[iindex]->status |= VISIBLE;
count++;
dprint(5, (debugfile,
" Message %d (%s from %s) marked as visible\n",
iindex, headers[iindex]->subject,
headers[iindex]->from));
}
}
else if (based_on == TO) {
for (iindex = 0; iindex < message_count; iindex++)
if (! in_string(shift_lower(headers[iindex]->to), pattern))
headers[iindex]->status &= ~VISIBLE;
else if (additional_criteria &&
!(headers[iindex]->status & VISIBLE))
headers[iindex]->status &= ~VISIBLE; /* shut down! */
else { /* mark it as readable */
headers[iindex]->status |= VISIBLE;
count++;
dprint(5, (debugfile,
" Message %d (%s from %s) marked as visible\n",
iindex, headers[iindex]->subject,
headers[iindex]->from));
}
}
dprint(4, (debugfile, "\n** returning %d selected **\n\n\n", count));
return(count);
}
int
next_message(iindex, skipdel)
register int iindex, skipdel;
{
/** Given 'iindex', this routine will return the actual iindex into the
array of the NEXT message, or '-1' iindex is the last.
If skipdel, return the iindex for the NEXT undeleted message.
If selected, return the iindex for the NEXT message marked VISIBLE.
**/
register int remember_for_debug;
if(iindex < 0) return(-1); /* invalid argument value! */
remember_for_debug = iindex;
for(iindex++;iindex < message_count; iindex++)
if (((headers[iindex]->status & VISIBLE) || (!selected))
&& (!(headers[iindex]->status & DELETED) || (!skipdel))) {
dprint(9, (debugfile, "[Next%s%s: given %d returning %d]\n",
(skipdel ? " undeleted" : ""),
(selected ? " visible" : ""),
remember_for_debug+1, iindex+1));
return(iindex);
}
return(-1);
}
int
prev_message(iindex, skipdel)
register int iindex, skipdel;
{
/** Like next_message, but the PREVIOUS message. **/
register int remember_for_debug;
if(iindex >= message_count) return(-1); /* invalid argument value! */
remember_for_debug = iindex;
for(iindex--; iindex >= 0; iindex--)
if (((headers[iindex]->status & VISIBLE) || (!selected))
&& (!(headers[iindex]->status & DELETED) || (!skipdel))) {
dprint(9, (debugfile, "[Previous%s%s: given %d returning %d]\n",
(skipdel ? " undeleted" : ""),
(selected ? " visible" : ""),
remember_for_debug+1, iindex+1));
return(iindex);
}
return(-1);
}
int
compute_visible(message)
int message;
{
/** return the 'virtual' iindex of the specified message in the
set of messages - that is, if we have the 25th message as
the current one, but it's #2 based on our limit criteria,
this routine, given 25, will return 2.
**/
register int iindex, count = 0;
if (! selected) return(message);
if (message < 1) message = 1; /* normalize */
for (iindex = 0; iindex < message; iindex++)
if (headers[iindex]->status & VISIBLE)
count++;
dprint(4, (debugfile,
"[compute-visible: displayed message %d is actually %d]\n",
count, message));
return(count);
}
int
visible_to_index(message)
int message;
{
/** Given a 'virtual' iindex, return a real one. This is the
flip-side of the routine above, and returns (message_count+1)
if it cannot map the virtual iindex requested (too big)
**/
register int iindex = 0, count = 0;
for (iindex = 0; iindex < message_count; iindex++) {
if (headers[iindex]->status & VISIBLE)
count++;
if (count == message) {
dprint(4, (debugfile,
"visible-to-index: (up) index %d is displayed as %d\n",
message, iindex));
return(iindex);
}
}
dprint(4, (debugfile, "index %d is NOT displayed!\n", message));
return(message_count+1);
}