chiark / gitweb /
queue() now uses the resolved name if available. This is looked up in
[disorder] / disobedience / choose-search.c
1 /*
2  * This file is part of DisOrder
3  * Copyright (C) 2008 Richard Kettlewell
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18  * USA
19  */
20 /** @file disobedience/search.c
21  * @brief Search support
22  *
23  * TODO:
24  * - cleverer focus to implement typeahead find
25  */
26 #include "disobedience.h"
27 #include "choose.h"
28
29 int choose_auto_expanding;
30
31 static GtkWidget *choose_search_entry;
32 static GtkWidget *choose_next;
33 static GtkWidget *choose_prev;
34 static GtkWidget *choose_clear;
35
36 /** @brief True if a search command is in flight */
37 static int choose_searching;
38
39 /** @brief True if in-flight search is now known to be obsolete */
40 static int choose_search_obsolete;
41
42 /** @brief Current search terms */
43 static char *choose_search_terms;
44
45 /** @brief Hash of all search result */
46 static hash *choose_search_hash;
47
48 /** @brief List of invisible search results
49  *
50  * This only lists search results not yet known to be visible, and is
51  * gradually depleted.
52  */
53 static char **choose_search_results;
54
55 /** @brief Length of @ref choose_search_results */
56 static int choose_n_search_results;
57
58 /** @brief Row references for search results */
59 static GtkTreeRowReference **choose_search_references;
60
61 /** @brief Length of @ref choose_search_references */
62 static int choose_n_search_references;
63
64 /** @brief Event handle for monitoring newly inserted tracks */
65 static event_handle choose_inserted_handle;
66
67 /** @brief Time of last search entry keypress (or 0.0) */
68 static struct timeval choose_search_last_keypress;
69
70 /** @brief Timeout ID for search delay */
71 static guint choose_search_timeout_id;
72
73 static void choose_search_entry_changed(GtkEditable *editable,
74                                         gpointer user_data);
75
76 int choose_is_search_result(const char *track) {
77   return choose_search_hash && hash_find(choose_search_hash, track);
78 }
79
80 static int is_prefix(const char *dir, const char *track) {
81   size_t nd = strlen(dir);
82
83   if(nd < strlen(track)
84      && track[nd] == '/'
85      && !strncmp(track, dir, nd))
86     return 1;
87   else
88     return 0;
89 }
90
91 /** @brief Do some work towards making @p track visible
92  * @return True if we made it visible or it was missing
93  */
94 static int choose_make_one_visible(const char *track) {
95   //fprintf(stderr, " choose_make_one_visible %s\n", track);
96   /* We walk through nodes at the top level looking for directories that are
97    * prefixes of the target track.
98    *
99    * - if we find one and it's expanded we walk through its children
100    * - if we find one and it's NOT expanded then we expand it, and arrange
101    *   to be revisited
102    * - if we don't find one then we're probably out of date
103    */
104   GtkTreeIter it[1];
105   gboolean itv = gtk_tree_model_get_iter_first(GTK_TREE_MODEL(choose_store),
106                                                it);
107   while(itv) {
108     const char *dir = choose_get_track(it);
109
110     //fprintf(stderr, "  %s\n", dir);
111     if(!dir) {
112       /* Placeholder */
113       itv = gtk_tree_model_iter_next(GTK_TREE_MODEL(choose_store), it);
114       continue;
115     }
116     GtkTreePath *path = gtk_tree_model_get_path(GTK_TREE_MODEL(choose_store),
117                                                 it);
118     if(!strcmp(dir, track)) {
119       /* We found the track.  If everything above it was expanded, it will be
120        * too.  So we can report it as visible. */
121       //fprintf(stderr, "   found %s\n", track);
122       choose_search_references[choose_n_search_references++]
123         = gtk_tree_row_reference_new(GTK_TREE_MODEL(choose_store), path);
124       gtk_tree_path_free(path);
125       return 1;
126     }
127     if(is_prefix(dir, track)) {
128       /* We found a prefix of the target track. */
129       //fprintf(stderr, "   %s is a prefix\n", dir);
130       const gboolean expanded
131         = gtk_tree_view_row_expanded(GTK_TREE_VIEW(choose_view), path);
132       if(expanded) {
133         //fprintf(stderr, "   is apparently expanded\n");
134         /* This directory is expanded, let's make like Augustus Gibbons and
135          * take it to the next level. */
136         GtkTreeIter child[1];           /* don't know if parent==iter allowed */
137         itv = gtk_tree_model_iter_children(GTK_TREE_MODEL(choose_store),
138                                            child,
139                                            it);
140         *it = *child;
141         if(choose_is_placeholder(it)) {
142           //fprintf(stderr, "   %s is expanded, has a placeholder child\n", dir);
143           /* We assume that placeholder children of expanded rows are about to
144            * be replaced */
145           gtk_tree_path_free(path);
146           return 0;
147         }
148       } else {
149         //fprintf(stderr, "   requesting expansion of %s\n", dir);
150         /* Track is below a non-expanded directory.  So let's expand it.
151          * choose_make_visible() will arrange a revisit in due course.
152          *
153          * We mark the row as auto-expanded.
154          */
155         ++choose_auto_expanding;
156         gtk_tree_view_expand_row(GTK_TREE_VIEW(choose_view),
157                                  path,
158                                  FALSE/*open_all*/);
159         gtk_tree_path_free(path);
160         --choose_auto_expanding;
161         return 0;
162       }
163     } else
164       itv = gtk_tree_model_iter_next(GTK_TREE_MODEL(choose_store), it);
165     gtk_tree_path_free(path);
166   }
167   /* If we reach the end then we didn't find the track at all. */
168   fprintf(stderr, "choose_make_one_visible: could not find %s\n",
169           track);
170   return 1;
171 }
172
173 /** @brief Compare two GtkTreeRowReferences
174  *
175  * Not very efficient since it does multiple memory operations per
176  * comparison!
177  */
178 static int choose_compare_references(const void *av, const void *bv) {
179   GtkTreeRowReference *a = *(GtkTreeRowReference **)av;
180   GtkTreeRowReference *b = *(GtkTreeRowReference **)bv;
181   GtkTreePath *pa = gtk_tree_row_reference_get_path(a);
182   GtkTreePath *pb = gtk_tree_row_reference_get_path(b);
183   const int rc = gtk_tree_path_compare(pa, pb);
184   gtk_tree_path_free(pa);
185   gtk_tree_path_free(pb);
186   return rc;
187 }
188
189 /** @brief Make @p path visible
190  * @param path Row reference to make visible
191  * @param row_align Row alignment (or -ve)
192  * @return 0 on success, nonzero if @p ref has gone stale
193  *
194  * If @p row_align is negative no row alignemt is performed.  Otherwise
195  * it must be between 0 (the top) and 1 (the bottom).
196  *
197  * TODO: if the row is already visible do nothing.
198  */
199 static int choose_make_path_visible(GtkTreePath *path,
200                                     gfloat row_align) {
201   /* Make sure that the target's parents are all expanded */
202   gtk_tree_view_expand_to_path(GTK_TREE_VIEW(choose_view), path);
203   /* Make sure the target is visible */
204   gtk_tree_view_scroll_to_cell(GTK_TREE_VIEW(choose_view), path, NULL,
205                                row_align >= 0.0,
206                                row_align,
207                                0);
208   return 0;
209 }
210
211 /** @brief Make @p ref visible
212  * @param ref Row reference to make visible
213  * @param row_align Row alignment (or -ve)
214  * @return 0 on success, nonzero if @p ref has gone stale
215  *
216  * If @p row_align is negative no row alignemt is performed.  Otherwise
217  * it must be between 0 (the top) and 1 (the bottom).
218  */
219 static int choose_make_ref_visible(GtkTreeRowReference *ref,
220                                    gfloat row_align) {
221   GtkTreePath *path = gtk_tree_row_reference_get_path(ref);
222   if(!path)
223     return -1;
224   choose_make_path_visible(path, row_align);
225   gtk_tree_path_free(path);
226   return 0;
227 }
228
229 /** @brief Do some work towards ensuring that all search results are visible
230  *
231  * Assumes there's at least one results!
232  */
233 static void choose_make_visible(const char attribute((unused)) *event,
234                                 void attribute((unused)) *eventdata,
235                                 void attribute((unused)) *callbackdata) {
236   //fprintf(stderr, "choose_make_visible\n");
237   int remaining = 0;
238
239   for(int n = 0; n < choose_n_search_results; ++n) {
240     if(!choose_search_results[n])
241       continue;
242     if(choose_make_one_visible(choose_search_results[n]))
243       choose_search_results[n] = 0;
244     else
245       ++remaining;
246   }
247   //fprintf(stderr, "remaining=%d\n", remaining);
248   if(remaining) {
249     /* If there's work left to be done make sure we get a callback when
250      * something changes */
251     if(!choose_inserted_handle)
252       choose_inserted_handle = event_register("choose-more-tracks",
253                                               choose_make_visible, 0);
254   } else {
255     /* Suppress callbacks if there's nothing more to do */
256     event_cancel(choose_inserted_handle);
257     choose_inserted_handle = 0;
258     /* We've expanded everything, now we can mess with the cursor */
259     //fprintf(stderr, "sort %d references\n", choose_n_search_references);
260     qsort(choose_search_references,
261           choose_n_search_references,
262           sizeof (GtkTreeRowReference *),
263           choose_compare_references);
264     choose_make_ref_visible(choose_search_references[0], 0.5);
265   }
266 }
267
268 /** @brief Called with search results */
269 static void choose_search_completed(void attribute((unused)) *v,
270                                     const char *error,
271                                     int nvec, char **vec) {
272   //fprintf(stderr, "choose_search_completed\n");
273   if(error) {
274     popup_protocol_error(0, error);
275     return;
276   }
277   choose_searching = 0;
278   /* If the search was obsoleted initiate another one */
279   if(choose_search_obsolete) {
280     choose_search_obsolete = 0;
281     choose_search_entry_changed(0, 0);
282     return;
283   }
284   //fprintf(stderr, "*** %d search results\n", nvec);
285   /* We're actually going to use these search results.  Autocollapse anything
286    * left over from the old search. */
287   choose_auto_collapse();
288   choose_search_hash = hash_new(1);
289   if(nvec) {
290     for(int n = 0; n < nvec; ++n)
291       hash_add(choose_search_hash, vec[n], "", HASH_INSERT);
292     /* Stash results for choose_make_visible */
293     choose_n_search_results = nvec;
294     choose_search_results = vec;
295     /* Make a big-enough buffer for the results row reference list */
296     choose_n_search_references = 0;
297     choose_search_references = xcalloc(nvec, sizeof (GtkTreeRowReference *));
298     /* Start making rows visible */
299     choose_make_visible(0, 0, 0);
300     gtk_widget_set_sensitive(choose_next, TRUE);
301     gtk_widget_set_sensitive(choose_prev, TRUE);
302   } else {
303     gtk_widget_set_sensitive(choose_next, FALSE);
304     gtk_widget_set_sensitive(choose_prev, FALSE);
305   }
306   event_raise("search-results-changed", 0);
307 }
308
309 /** @brief Actually initiate a search */
310 static void initiate_search(void) {
311   //fprintf(stderr, "initiate_search\n");
312   /* If a search is in flight don't initiate a new one until it comes back */
313   if(choose_searching) {
314     choose_search_obsolete = 1;
315     return;
316   }
317   char *terms = xstrdup(gtk_entry_get_text(GTK_ENTRY(choose_search_entry)));
318   /* Strip leading and trailing space */
319   while(*terms == ' ')
320     ++terms;
321   char *e = terms + strlen(terms);
322   while(e > terms && e[-1] == ' ')
323     --e;
324   *e = 0;
325   if(choose_search_terms && !strcmp(terms, choose_search_terms)) {
326     /* Search terms have not actually changed in any way that matters */
327     return;
328   }
329   /* Remember the current terms */
330   choose_search_terms = terms;
331   if(!*terms) {
332     /* Nothing to search for.  Fake a completion call. */
333     choose_search_completed(0, 0, 0, 0);
334     return;
335   }
336   if(disorder_eclient_search(client, choose_search_completed, terms, 0)) {
337     /* Bad search terms.  Fake a completion call. */
338     choose_search_completed(0, 0, 0, 0);
339     return;
340   }
341   choose_searching = 1;
342 }
343
344 static gboolean choose_search_timeout(gpointer attribute((unused)) data) {
345   struct timeval now;
346   xgettimeofday(&now, NULL);
347   /*fprintf(stderr, "%ld.%06d choose_search_timeout\n",
348           now.tv_sec, now.tv_usec);*/
349   if(tvdouble(now) - tvdouble(choose_search_last_keypress)
350          < SEARCH_DELAY_MS / 1000.0) {
351     //fprintf(stderr, " ... too soon\n");
352     return TRUE;                        /* Call me again later */
353   }
354   //fprintf(stderr, " ... let's go\n");
355   choose_search_last_keypress.tv_sec = 0;
356   choose_search_last_keypress.tv_usec = 0;
357   choose_search_timeout_id = 0;
358   initiate_search();
359   return FALSE;
360 }
361
362 /** @brief Called when the search entry changes */
363 static void choose_search_entry_changed
364     (GtkEditable attribute((unused)) *editable,
365      gpointer attribute((unused)) user_data) {
366   xgettimeofday(&choose_search_last_keypress, NULL);
367   /*fprintf(stderr, "%ld.%06d choose_search_entry_changed\n",
368           choose_search_last_keypress.tv_sec,
369           choose_search_last_keypress.tv_usec);*/
370   /* If there's already a timeout, remove it */
371   if(choose_search_timeout_id) {
372     g_source_remove(choose_search_timeout_id);
373     choose_search_timeout_id = 0;
374   }
375   /* Add a new timeout */
376   choose_search_timeout_id = g_timeout_add(SEARCH_DELAY_MS / 10,
377                                            choose_search_timeout,
378                                            0);
379   /* We really wanted to tell Glib what time we wanted the callback at rather
380    * than asking for calls at given intervals.  But there's no interface for
381    * that, and defining a new source for it seems like overkill if we can
382    * reasonably avoid it. */
383 }
384
385 /** @brief Identify first and last visible paths
386  *
387  * We'd like to use gtk_tree_view_get_visible_range() for this, but that was
388  * introduced in GTK+ 2.8, and Fink only has 2.6 (which is around three years
389  * out of date at time of writing), and I'm not yet prepared to rule out Fink
390  * support.
391  */
392 static gboolean choose_get_visible_range(GtkTreeView *tree_view,
393                                          GtkTreePath **startpathp,
394                                          GtkTreePath **endpathp) {
395   GdkRectangle visible_tc[1];
396
397   /* Get the visible rectangle in tree coordinates */
398   gtk_tree_view_get_visible_rect(tree_view, visible_tc);
399   /*fprintf(stderr, "visible: %dx%x at %dx%d\n",
400           visible_tc->width, visible_tc->height,
401           visible_tc->x, visible_tc->y);*/
402   if(startpathp) {
403     /* Convert top-left visible point to widget coordinates */
404     int x_wc, y_wc;
405     gtk_tree_view_tree_to_widget_coords(tree_view,
406                                         visible_tc->x, visible_tc->y,
407                                         &x_wc, &y_wc);
408     //fprintf(stderr, " start widget coords: %dx%d\n", x_wc, y_wc);
409     gtk_tree_view_get_path_at_pos(tree_view,
410                                   x_wc, y_wc,
411                                   startpathp,
412                                   NULL,
413                                   NULL, NULL);
414   }
415   if(endpathp) {
416     /* Convert bottom-left visible point to widget coordinates */
417     /* Convert top-left visible point to widget coordinates */
418     int x_wc, y_wc;
419     gtk_tree_view_tree_to_widget_coords(tree_view,
420                                         visible_tc->x,
421                                         visible_tc->y + visible_tc->height - 1,
422                                         &x_wc, &y_wc);
423     //fprintf(stderr, " end widget coords: %dx%d\n", x_wc, y_wc);
424     gtk_tree_view_get_path_at_pos(tree_view,
425                                   x_wc, y_wc,
426                                   endpathp,
427                                   NULL,
428                                   NULL, NULL);
429   }
430   return TRUE;
431 }
432
433 static void choose_next_clicked(GtkButton attribute((unused)) *button,
434                                 gpointer attribute((unused)) userdata) {
435   /* Find the last visible row */
436   GtkTreePath *endpath;
437   gboolean endvalid = choose_get_visible_range(GTK_TREE_VIEW(choose_view),
438                                                NULL,
439                                                &endpath);
440   if(!endvalid)
441     return;
442   /* Find a the first search result later than it.  They're sorted so we could
443    * actually do much better than this if necessary. */
444   for(int n = 0; n < choose_n_search_references; ++n) {
445     GtkTreePath *path
446       = gtk_tree_row_reference_get_path(choose_search_references[n]);
447     if(!path)
448       continue;
449     if(gtk_tree_path_compare(endpath, path) < 0) {
450       choose_make_path_visible(path, 0.5);
451       gtk_tree_path_free(path);
452       return;
453     }
454     gtk_tree_path_free(path);
455   }
456 }
457
458 static void choose_prev_clicked(GtkButton attribute((unused)) *button,
459                                 gpointer attribute((unused)) userdata) {
460   /* TODO can we de-dupe with choose_next_clicked?  Probably yes. */
461   /* Find the first visible row */
462   GtkTreePath *startpath;
463   gboolean startvalid = choose_get_visible_range(GTK_TREE_VIEW(choose_view),
464                                                  &startpath,
465                                                  NULL);
466   if(!startvalid)
467     return;
468   /* Find a the last search result earlier than it.  They're sorted so we could
469    * actually do much better than this if necessary. */
470   for(int n = choose_n_search_references - 1; n >= 0; --n) {
471     GtkTreePath *path
472       = gtk_tree_row_reference_get_path(choose_search_references[n]);
473     if(!path)
474       continue;
475     if(gtk_tree_path_compare(startpath, path) > 0) {
476       choose_make_path_visible(path, 0.5);
477       gtk_tree_path_free(path);
478       return;
479     }
480     gtk_tree_path_free(path);
481   }
482 }
483
484 /** @brief Called when the cancel search button is clicked */
485 static void choose_clear_clicked(GtkButton attribute((unused)) *button,
486                                  gpointer attribute((unused)) userdata) {
487   gtk_entry_set_text(GTK_ENTRY(choose_search_entry), "");
488   /* We start things off straight away in this case */
489   initiate_search();
490 }
491
492 /** @brief Create the search widget */
493 GtkWidget *choose_search_widget(void) {
494
495   /* Text entry box for search terms */
496   choose_search_entry = gtk_entry_new();
497   gtk_widget_set_style(choose_search_entry, tool_style);
498   g_signal_connect(choose_search_entry, "changed",
499                    G_CALLBACK(choose_search_entry_changed), 0);
500   gtk_tooltips_set_tip(tips, choose_search_entry,
501                        "Enter search terms here; search is automatic", "");
502
503   /* Cancel button to clear the search */
504   choose_clear = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
505   gtk_widget_set_style(choose_clear, tool_style);
506   g_signal_connect(G_OBJECT(choose_clear), "clicked",
507                    G_CALLBACK(choose_clear_clicked), 0);
508   gtk_tooltips_set_tip(tips, choose_clear, "Clear search terms", "");
509
510   /* Up and down buttons to find previous/next results; initially they are not
511    * usable as there are no search results. */
512   choose_prev = iconbutton("up.png", "Previous search result");
513   g_signal_connect(G_OBJECT(choose_prev), "clicked",
514                    G_CALLBACK(choose_prev_clicked), 0);
515   gtk_widget_set_style(choose_prev, tool_style);
516   gtk_widget_set_sensitive(choose_prev, 0);
517   choose_next = iconbutton("down.png", "Next search result");
518   g_signal_connect(G_OBJECT(choose_next), "clicked",
519                    G_CALLBACK(choose_next_clicked), 0);
520   gtk_widget_set_style(choose_next, tool_style);
521   gtk_widget_set_sensitive(choose_next, 0);
522   
523   /* Pack the search tools button together on a line */
524   GtkWidget *hbox = gtk_hbox_new(FALSE/*homogeneous*/, 1/*spacing*/);
525   gtk_box_pack_start(GTK_BOX(hbox), choose_search_entry,
526                      TRUE/*expand*/, TRUE/*fill*/, 0/*padding*/);
527   gtk_box_pack_start(GTK_BOX(hbox), choose_prev,
528                      FALSE/*expand*/, FALSE/*fill*/, 0/*padding*/);
529   gtk_box_pack_start(GTK_BOX(hbox), choose_next,
530                      FALSE/*expand*/, FALSE/*fill*/, 0/*padding*/);
531   gtk_box_pack_start(GTK_BOX(hbox), choose_clear,
532                      FALSE/*expand*/, FALSE/*fill*/, 0/*padding*/);
533
534   return hbox;
535 }
536
537 /*
538 Local Variables:
539 c-basic-offset:2
540 comment-column:40
541 fill-column:79
542 indent-tabs-mode:nil
543 End:
544 */