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/*
* WORK IN PROGRESS ALERT: Daniel Eisenbud <daniel@math.berkeley.edu>
* is currently working on this code. Contact him before working on it!
*/
/*
* Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "mutt.h"
#include "sort.h"
#include <string.h>
#include <ctype.h>
/* returns 1 if `a' is a descendant (child) of thread `b' */
static int is_descendant (HEADER *a, HEADER *b)
{
/* find the top parent of the thread */
while (a->parent)
a = a->parent;
return (a == b);
}
/* This function makes use of the fact that Mutt stores message references in
* reverse order (i.e., last to first). This is optiminal since we would like
* to find the most recent message to which "cur" refers itself.
*/
static HEADER *find_reference (HEADER *cur, CONTEXT *ctx)
{
LIST *refs = cur->env->references;
HEADER *ptr;
for (; refs; refs = refs->next)
{
/* ups, this message is in a reference loop. bad. */
if (cur->env->message_id && !strcmp (cur->env->message_id, refs->data))
continue;
if ((ptr = hash_find (ctx->id_hash, refs->data)))
{
if (is_descendant (ptr, cur))
continue;
return ptr;
}
}
return NULL;
}
/* Determines whether to display a message's subject. */
static int need_display_subject (CONTEXT *ctx, HEADER *tree)
{
HEADER *tmp;
/* if our subject is different from our parent's, display it */
if (tree->subject_changed)
return (1);
/* if our subject is different from that of our closest previously displayed
* sibling, display the subject */
for (tmp = tree->prev; tmp; tmp = tmp->prev)
{
if (tmp->virtual >= 0 || (tmp->collapsed && (!ctx->pattern || tmp->limited)))
{
if (tmp->subject_changed)
return (1);
else
break;
}
}
/* if there is a parent-to-child subject change anywhere between us and our
* closest displayed ancestor, display the subject */
for (tmp = tree->parent; tmp; tmp = tmp->parent)
{
if (tmp->virtual >= 0 || (tmp->collapsed && (!ctx->pattern || tmp->limited)))
return (0);
else if (tmp->subject_changed)
return (1);
}
/* if we have no visible parent or previous sibling, display the subject */
return (1);
}
/* determines whether a later sibling or the child of a later
* sibling is displayed.
*/
static int is_next_displayed (CONTEXT *ctx, HEADER *tree)
{
int depth = 0;
if ((tree = tree->next) == NULL)
return (0);
FOREVER
{
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
return (1);
if (tree->child)
{
tree = tree->child;
depth++;
}
else
{
while (!tree->next && depth > 0)
{
tree = tree->parent;
depth--;
}
if ((tree = tree->next) == NULL)
break;
}
}
return (0);
}
/* Since the graphics characters have a value >255, I have to resort to
* using escape sequences to pass the information to print_enriched_string().
* These are the macros M_TREE_* defined in mutt.h.
*
* ncurses should automatically use the default ASCII characters instead of
* graphics chars on terminals which don't support them (see the man page
* for curs_addch).
*/
void mutt_linearize_tree (CONTEXT *ctx, int linearize)
{
char *pfx = NULL, *mypfx = NULL, *arrow = NULL, *myarrow = NULL;
char corner = Sort & SORT_REVERSE ? M_TREE_ULCORNER : M_TREE_LLCORNER;
int depth = 0, start_depth = 0, max_depth = 0, max_width = 0;
int nextdisp = 0;
HEADER *tree = ctx->tree;
HEADER **array = ctx->hdrs + (Sort & SORT_REVERSE ? ctx->msgcount - 1 : 0);
/* A NULL tree should never be passed here, but may occur if there is
* a cycle.
*/
if (!tree)
return;
FOREVER
{
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
tree->display_subject = need_display_subject (ctx, tree);
if (depth >= max_depth)
safe_realloc ((void **) &pfx,
(max_depth += 32) * 2 * sizeof (char));
if (depth - start_depth >= max_width)
safe_realloc ((void **) &arrow,
(max_width += 16) * 2 * sizeof (char));
safe_free ((void **) &tree->tree);
if (!depth)
{
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
tree->tree = safe_strdup ("");
}
else
{
myarrow = arrow + (depth - start_depth - (start_depth ? 0 : 1)) * 2;
nextdisp = is_next_displayed (ctx, tree);
if (depth && start_depth == depth)
myarrow[0] = nextdisp ? M_TREE_LTEE : corner;
else
myarrow[0] = M_TREE_HIDDEN;
myarrow[1] = tree->fake_thread ? M_TREE_STAR : M_TREE_HLINE;
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
{
myarrow[2] = M_TREE_RARROW;
myarrow[3] = 0;
}
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
{
tree->tree = safe_malloc ((2 + depth * 2) * sizeof (char));
if (start_depth > 1)
{
strncpy (tree->tree, pfx, (start_depth - 1) * 2);
strfcpy (tree->tree + (start_depth - 1) * 2,
arrow, (2 + depth - start_depth) * 2);
}
else
strfcpy (tree->tree, arrow, 2 + depth * 2);
}
}
if (linearize)
{
*array = tree;
array += Sort & SORT_REVERSE ? -1 : 1;
}
if (tree->child)
{
if (depth)
{
mypfx = pfx + (depth - 1) * 2;
mypfx[0] = nextdisp ? M_TREE_VLINE : M_TREE_SPACE;
mypfx[1] = M_TREE_SPACE;
}
depth++;
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
start_depth = depth;
tree = tree->child;
}
else
{
while (!tree->next && tree->parent)
{
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
start_depth = depth;
tree = tree->parent;
if (start_depth == depth)
start_depth--;
depth--;
}
if (tree->virtual >= 0 || (tree->collapsed && (!ctx->pattern || tree->limited)))
start_depth = depth;
if ((tree = tree->next) == NULL)
break;
}
}
safe_free ((void **) &pfx);
safe_free ((void **) &arrow);
}
/* inserts `msg' into the list `tree' using an insertion sort. this function
* assumes that `tree' is the first element in the list, and not some
* element in the middle of the list.
*/
static void insert_message (HEADER **tree, HEADER *msg, sort_t *sortFunc)
{
HEADER *tmp;
/* NOTE: we do NOT clear the `msg->child' link here because when we do
* the pseudo-threading, we want to preserve any sub-threads. So we clear
* the `msg->child' in the main routine where we know it is safe to do.
*/
/* if there are no elements in the list, just add it and return */
if (!*tree)
{
msg->prev = msg->next = NULL;
*tree = msg;
return;
}
/* check to see if this message belongs at the beginning of the list */
if (!sortFunc || sortFunc ((void *) &msg, (void *) tree) < 0)
{
(*tree)->prev = msg;
msg->next = *tree;
msg->prev = NULL;
*tree = msg;
return;
}
/* search for the correct spot in the list to insert */
for (tmp = *tree; tmp->next; tmp = tmp->next)
if (sortFunc ((void *) &msg, (void *) &tmp->next) < 0)
{
msg->prev = tmp;
msg->next = tmp->next;
tmp->next->prev = msg;
tmp->next = msg;
return;
}
/* did not insert yet, so add this message to the end of the list */
tmp->next = msg;
msg->prev = tmp;
msg->next = NULL;
}
/* find the best possible match for a parent mesage based upon subject.
* if there are multiple matches, the one which was sent the latest, but
* before the current message, is used.
*/
static HEADER *find_subject (CONTEXT *ctx, HEADER *cur)
{
struct hash_elem *ptr;
HEADER *tmp, *last = NULL;
ENVELOPE *env = cur->env;
int hash;
if (env->real_subj &&
((env->real_subj != env->subject) || (!option (OPTSORTRE))))
{
hash = hash_string ((unsigned char *) env->real_subj, ctx->subj_hash->nelem);
for (ptr = ctx->subj_hash->table[hash]; ptr; ptr = ptr->next)
{
tmp = ptr->data;
if (tmp != cur && /* don't match the same message */
!tmp->fake_thread && /* don't match pseudo threads */
tmp->subject_changed && /* only match interesting replies */
!is_descendant (tmp, cur) && /* don't match in the same thread */
cur->date_sent >= tmp->date_sent &&
(!last || (last->date_sent <= tmp->date_sent)) &&
tmp->env->real_subj &&
mutt_strcmp (env->real_subj, tmp->env->real_subj) == 0)
{
last = tmp; /* best match so far */
}
}
}
return last;
}
static void unlink_message (HEADER **top, HEADER *cur)
{
if (cur->prev)
{
cur->prev->next = cur->next;
if (cur->next)
cur->next->prev = cur->prev;
}
else
{
if (cur->next)
cur->next->prev = NULL;
*top = cur->next;
}
}
static void pseudo_threads (CONTEXT *ctx, sort_t *sortFunc)
{
HEADER *tree = ctx->tree;
HEADER *top = tree, *cur, *tmp, *curchild, *nextchild;
while (tree)
{
cur = tree;
tree = tree->next;
if ((tmp = find_subject (ctx, cur)) != NULL)
{
/* detach this message from it's current location */
unlink_message (&top, cur);
cur->subject_changed = 0;
cur->fake_thread = 1;
cur->parent = tmp;
insert_message (&tmp->child, cur, sortFunc);
/* if the message we're attaching has pseudo-children, they
need to be attached to its parent, so move them up a level. */
for (curchild = cur->child; curchild; )
{
nextchild = curchild->next;
if (curchild->fake_thread)
{
/* detach this message from its current location */
unlink_message (&cur->child, curchild);
curchild->parent = tmp;
insert_message (&tmp->child, curchild, sortFunc);
}
curchild = nextchild;
}
}
}
ctx->tree = top;
}
static HEADER *sort_last (HEADER *top)
{
HEADER *tree;
HEADER *tmp;
HEADER *first;
HEADER *last;
HEADER *nextsearch;
sort_t *usefunc;
usefunc = mutt_get_sort_func (Sort);
tree = top;
FOREVER
{
if (tree->child)
tree = tree->child;
else
{
while (!tree->next)
{
first = last = tree;
nextsearch = tree->prev;
first->prev = NULL;
last->next = NULL;
while ((tree = nextsearch) != NULL)
{
tmp = last;
nextsearch = nextsearch->prev;
while (tmp && (*usefunc) ((void *) &tree->last_sort,
(void *) &tmp->last_sort) < 0)
tmp = tmp->prev;
if (tmp)
{
if ((tree->next = tmp->next) != NULL)
tmp->next->prev = tree;
else
last = tree;
tmp->next = tree;
tree->prev = tmp;
}
else
{
tree->next = first;
first->prev = tree;
first = tree;
tree->prev = NULL;
}
}
if (first->parent)
{
first->parent->child = first;
tree = first->parent;
if (Sort & SORT_REVERSE)
{
if ((*usefunc) ((void *) &tree->last_sort,
(void *) &first->last_sort) > 0)
tree->last_sort = first->last_sort;
}
else
{
if ((*usefunc) ((void *) &tree->last_sort,
(void *) &last->last_sort) < 0)
tree->last_sort = last->last_sort;
}
}
else
{
top = first;
tree = last;
break;
}
}
if ((tree = tree->next) == NULL)
break;
}
}
return top;
}
static void move_descendants (HEADER **tree, HEADER *cur, sort_t *usefunc)
{
HEADER *ptr, *tmp = *tree;
while (tmp)
{
/* only need to look at the last reference */
if (tmp->env->references &&
mutt_strcmp (tmp->env->references->data, cur->env->message_id) == 0)
{
/* remove message from current location */
unlink_message (tree, tmp);
tmp->parent = cur;
if (cur->env->real_subj && tmp->env->real_subj)
tmp->subject_changed = mutt_strcmp (tmp->env->real_subj, cur->env->real_subj) ? 1 : 0;
else
tmp->subject_changed = (cur->env->real_subj || tmp->env->real_subj) ? 1 : 0;
tmp->fake_thread = 0; /* real reference */
ptr = tmp;
tmp = tmp->next;
insert_message (&cur->child, ptr, usefunc);
}
else
tmp = tmp->next;
}
}
void mutt_clear_threads (CONTEXT *ctx)
{
int i;
for (i = 0; i < ctx->msgcount; i++)
{
ctx->hdrs[i]->parent = NULL;
ctx->hdrs[i]->next = NULL;
ctx->hdrs[i]->prev = NULL;
ctx->hdrs[i]->child = NULL;
ctx->hdrs[i]->threaded = 0;
ctx->hdrs[i]->fake_thread = 0;
}
ctx->tree = NULL;
}
HEADER *mutt_sort_subthreads (HEADER *hdr, sort_t *func)
{
HEADER *top = NULL;
HEADER *t;
while (hdr)
{
t = hdr;
hdr = hdr->next;
insert_message (&top, t, func);
if (t->child)
t->child = mutt_sort_subthreads (t->child, func);
}
return top;
}
void mutt_sort_threads (CONTEXT *ctx, int init)
{
sort_t *usefunc = NULL;
HEADER *tmp, *CUR;
int i, oldsort;
/* set Sort to the secondary method to support the set sort_aux=reverse-*
* settings. The sorting functions just look at the value of
* SORT_REVERSE
*/
oldsort = Sort;
Sort = SortAux;
/* get secondary sorting method. we can't have threads, so use the date
* if the user specified it
*/
if ((Sort & SORT_MASK) == SORT_THREADS)
Sort = (Sort & ~SORT_MASK) | SORT_DATE;
/* if the SORT_LAST bit is set, we save sorting for later */
if (!(Sort & SORT_LAST))
usefunc = mutt_get_sort_func (Sort);
for (i = 0; i < ctx->msgcount; i++)
{
CUR = ctx->hdrs[i];
if (CUR->fake_thread)
{
/* Move pseudo threads back to the top level thread so that they can
* can be moved later if they are descendants of messages that were
* just delivered.
*/
CUR->fake_thread = 0;
CUR->subject_changed = 1;
unlink_message (&CUR->parent->child, CUR);
CUR->parent = NULL;
insert_message (&ctx->tree, CUR, usefunc);
}
else if (!CUR->threaded)
{
if ((tmp = find_reference (CUR, ctx)) != NULL)
{
CUR->parent = tmp;
if (CUR->env->real_subj && tmp->env->real_subj)
CUR->subject_changed = mutt_strcmp (tmp->env->real_subj, CUR->env->real_subj) ? 1 : 0;
else
CUR->subject_changed = (CUR->env->real_subj || tmp->env->real_subj) ? 1 : 0;
}
else
CUR->subject_changed = 1;
if (!init)
{
/* Search the children of `tmp' for decendants of `cur'. This is only
* done when the mailbox has already been threaded since we don't have
* to worry about the tree being threaded wrong (because of a missing
* parent) during the initial threading.
*/
if (CUR->env->message_id)
move_descendants (tmp ? &tmp->child : &ctx->tree, CUR, usefunc);
}
insert_message (tmp ? &tmp->child : &ctx->tree, CUR, usefunc);
CUR->threaded = 1;
}
}
if (!option (OPTSTRICTTHREADS))
pseudo_threads (ctx, usefunc);
/* now that the whole tree is put together, we can sort by last-* */
if (Sort & SORT_LAST)
{
for (i = 0; i < ctx->msgcount; i++)
ctx->hdrs[i]->last_sort = ctx->hdrs[i];
ctx->tree = sort_last (ctx->tree);
}
/* restore the oldsort order. */
Sort = oldsort;
/* Put the list into an array. If we are reverse sorting, give the
* offset of the last message, and work backwards (tested for and
* done inside the function), so that the threads go backwards.
* This, of course, means the auxillary sort has to go forwards
* because we map it backwards here.
*/
mutt_linearize_tree (ctx, 1);
}
static HEADER *find_virtual (HEADER *cur)
{
HEADER *top;
if (cur->virtual >= 0)
return (cur);
top = cur;
if ((cur = cur->child) == NULL)
return (NULL);
FOREVER
{
if (cur->virtual >= 0)
return (cur);
if (cur->child)
cur = cur->child;
else if (cur->next)
cur = cur->next;
else
{
while (!cur->next)
{
cur = cur->parent;
if (cur == top)
return (NULL);
}
cur = cur->next;
}
/* not reached */
}
}
int _mutt_aside_thread (HEADER *hdr, short dir, short subthreads)
{
HEADER *tmp;
if ((Sort & SORT_MASK) != SORT_THREADS)
{
mutt_error ("Threading is not enabled.");
return (hdr->virtual);
}
if (!subthreads)
{
while (hdr->parent)
hdr = hdr->parent;
}
else
{
if ((dir != 0) ^ ((Sort & SORT_REVERSE) != 0))
{
while (!hdr->next && hdr->parent)
hdr = hdr->parent;
}
else
{
while (!hdr->prev && hdr->parent)
hdr = hdr->parent;
}
}
if ((dir != 0) ^ ((Sort & SORT_REVERSE) != 0))
{
do
{
hdr = hdr->next;
if (!hdr)
return (-1);
tmp = find_virtual (hdr);
} while (!tmp);
}
else
{
do
{
hdr = hdr->prev;
if (!hdr)
return (-1);
tmp = find_virtual (hdr);
} while (!tmp);
}
return (tmp->virtual);
}
void mutt_set_virtual (CONTEXT *ctx)
{
int i;
ctx->vcount = 0;
ctx->vsize = 0;
#define THIS_BODY cur->content
for (i = 0; i < ctx->msgcount; i++)
{
HEADER *cur = ctx->hdrs[i];
if (cur->virtual != -1)
{
cur->virtual = ctx->vcount;
ctx->v2r[ctx->vcount] = i;
ctx->vcount++;
ctx->vsize += THIS_BODY->length + THIS_BODY->offset - THIS_BODY->hdr_offset;
cur->num_hidden = mutt_get_hidden (ctx, cur);
}
}
#undef THIS_BODY
}
int _mutt_traverse_thread (CONTEXT *ctx, HEADER *cur, int flag)
{
HEADER *roothdr = NULL, *top;
int final, reverse = (Sort & SORT_REVERSE), minmsgno;
int num_hidden = 0, new = 0, old = 0;
int min_unread_msgno = INT_MAX, min_unread = cur->virtual;
#define CHECK_LIMIT (!ctx->pattern || cur->limited)
if ((Sort & SORT_MASK) != SORT_THREADS && !(flag & M_THREAD_GET_HIDDEN))
{
mutt_error ("Threading is not enabled.");
return (cur->virtual);
}
final = cur->virtual;
while (cur->parent)
cur = cur->parent;
top = cur;
minmsgno = cur->msgno;
if (!cur->read && CHECK_LIMIT)
{
if (cur->old)
old = 2;
else
new = 1;
if (cur->msgno < min_unread_msgno)
{
min_unread = cur->virtual;
min_unread_msgno = cur->msgno;
}
}
if (cur->virtual == -1 && CHECK_LIMIT)
num_hidden++;
if (flag & (M_THREAD_COLLAPSE | M_THREAD_UNCOLLAPSE))
{
cur->pair = 0; /* force index entry's color to be re-evaluated */
cur->collapsed = flag & M_THREAD_COLLAPSE;
if (cur->virtual != -1)
{
roothdr = cur;
if (flag & M_THREAD_COLLAPSE)
final = roothdr->virtual;
}
}
if ((cur = cur->child) == NULL)
{
/* return value depends on action requested */
if (flag & (M_THREAD_COLLAPSE | M_THREAD_UNCOLLAPSE))
return (final);
else if (flag & M_THREAD_UNREAD)
return ((old && new) ? new : (old ? old : new));
else if (flag & M_THREAD_GET_HIDDEN)
return (num_hidden);
else if (flag & M_THREAD_NEXT_UNREAD)
return (min_unread);
}
FOREVER
{
if (flag & (M_THREAD_COLLAPSE | M_THREAD_UNCOLLAPSE))
{
cur->pair = 0; /* force index entry's color to be re-evaluated */
cur->collapsed = flag & M_THREAD_COLLAPSE;
if (!roothdr && CHECK_LIMIT)
{
roothdr = cur;
if (flag & M_THREAD_COLLAPSE)
final = roothdr->virtual;
}
if (reverse && (flag & M_THREAD_COLLAPSE) && (cur->msgno < minmsgno) && CHECK_LIMIT)
{
minmsgno = cur->msgno;
final = cur->virtual;
}
if (flag & M_THREAD_COLLAPSE)
{
if (cur != roothdr)
cur->virtual = -1;
}
else
{
if (CHECK_LIMIT)
cur->virtual = cur->msgno;
}
}
if (!cur->read && CHECK_LIMIT)
{
if (cur->old)
old = 2;
else
new = 1;
if (cur->msgno < min_unread_msgno)
{
min_unread = cur->virtual;
min_unread_msgno = cur->msgno;
}
}
if (cur->virtual == -1 && CHECK_LIMIT)
num_hidden++;
if (cur->child)
cur = cur->child;
else if (cur->next)
cur = cur->next;
else
{
int done = 0;
while (!cur->next)
{
cur = cur->parent;
if (cur == top)
{
done = 1;
break;
}
}
if (done)
break;
cur = cur->next;
}
}
/* return value depends on action requested */
if (flag & (M_THREAD_COLLAPSE | M_THREAD_UNCOLLAPSE))
return (final);
else if (flag & M_THREAD_UNREAD)
return ((old && new) ? new : (old ? old : new));
else if (flag & M_THREAD_GET_HIDDEN)
return (num_hidden+1);
else if (flag & M_THREAD_NEXT_UNREAD)
return (min_unread);
return (0);
#undef CHECK_LIMIT
}
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