AnimEditors: Fuzzy/Multi-Word Name Filtering

Thanks to D1080 by @rockets, I've now been able to easily implement the
ability to type multiple word snippets/partial words into the text filter
field (in the Animation Editors), and have it filter the channels which
contain just some of those parts (instead of having to match everything).

For example, the following search strings will now work:
* "loc rot" or "lo ro" will now filter all location and rotation FCurves
* "col loc" will filter all location and color FCurves
* "scale" will also work as before to filter all scale FCurves

But, the following will not work:
* "lc rt" will NOT filter all location and rotation, as the fuzzy search only
  breaks down the search string based on whitespace placement

By default, this is not enabled when using name filtering (i.e. magnifying glass is checked,
and some filtering text is specified). Instead, you need to enable the "AZ" toggle beside
the name field. This fuzzy matching is not enabled by default as it could end up being
quite a bit slower on really heavy scenes. (There are probably some optimisation
opportunities, but that's only a future option if someone really needs it)

release/scripts/startup/bl_ui/space_dopesheet.py

@@ -51,11 +51,13 @@ def dopesheet_filter(layout, context, genericFiltersOnly=False):
         row.prop(dopesheet, "show_only_matching_fcurves", text="")
         if dopesheet.show_only_matching_fcurves:
             row.prop(dopesheet, "filter_fcurve_name", text="")
+            row.prop(dopesheet, "use_multi_word_filter", text="")
     else:
         row = layout.row(align=True)
         row.prop(dopesheet, "use_filter_text", text="")
         if dopesheet.use_filter_text:
             row.prop(dopesheet, "filter_text", text="")
+            row.prop(dopesheet, "use_multi_word_filter", text="")
 
     if not genericFiltersOnly:
         row = layout.row(align=True)
@@ -151,6 +153,7 @@ class DOPESHEET_HT_header(Header):
             row.prop(st.dopesheet, "use_filter_text", text="")
             if st.dopesheet.use_filter_text:
                 row.prop(st.dopesheet, "filter_text", text="")
+                row.prop(st.dopesheet, "use_multi_word_filter", text="")
 
         row = layout.row(align=True)
         row.prop(toolsettings, "use_proportional_action",

source/blender/editors/animation/anim_filter.c

@@ -76,7 +76,9 @@
 
 #include "BLI_blenlib.h"
 #include "BLI_utildefines.h"
+#include "BLI_alloca.h"
 #include "BLI_ghash.h"
+#include "BLI_string.h"
 
 #include "BKE_animsys.h"
 #include "BKE_action.h"
@@ -986,6 +988,35 @@ static bool skip_fcurve_selected_data(bDopeSheet *ads, FCurve *fcu, ID *owner_id
 	return false;
 }
 
+/* Helper for name-based filtering - Perform "partial/fuzzy matches" (as in 80a7efd) */
+static bool name_matches_dopesheet_filter(bDopeSheet *ads, char *name)
+{
+	if (ads->flag & ADS_FLAG_FUZZY_NAMES) {
+		/* full fuzzy, multi-word, case insensitive matches */
+		const size_t str_len = strlen(ads->searchstr);
+		const int words_max = (str_len / 2) + 1;
+		
+		int (*words)[2] = BLI_array_alloca(words, words_max);
+		const int words_len = BLI_string_find_split_words(ads->searchstr, str_len, ' ', words, words_max);
+		bool found = false;
+		
+		/* match name against all search words */
+		for (int index = 0; index < words_len; index++) {
+			if (BLI_strncasestr(name, ads->searchstr + words[index][0], words[index][1])) {
+				found = true;
+				break;
+			}
+		}
+		
+		/* if we have a match somewhere, this returns true */
+		return found;
+	}
+	else {
+		/* fallback/default - just case insensitive, but starts from start of word */
+		return BLI_strcasestr(name, ads->searchstr) != NULL;
+	}
+}
+
 /* (Display-)Name-based F-Curve filtering
  * NOTE: when this function returns true, the F-Curve is to be skipped 
  */
@@ -1010,7 +1041,7 @@ static bool skip_fcurve_with_name(bDopeSheet *ads, FCurve *fcu, ID *owner_id)
 		/* check for partial match with the match string, assuming case insensitive filtering 
 		 * if match, this channel shouldn't be ignored!
 		 */
-		return BLI_strcasestr(name, ads->searchstr) == NULL;
+		return !name_matches_dopesheet_filter(ads, name);
 	}
 	
 	/* just let this go... */
@@ -1315,12 +1346,12 @@ static size_t animfilter_nla(bAnimContext *UNUSED(ac), ListBase *anim_data, bDop
 						bool track_ok = false, strip_ok = false;
 						
 						/* check if the name of the track, or the strips it has are ok... */
-						track_ok = BLI_strcasestr(nlt->name, ads->searchstr);
+						track_ok = name_matches_dopesheet_filter(ads, nlt->name);
 						
 						if (track_ok == false) {
 							NlaStrip *strip;
 							for (strip = nlt->strips.first; strip; strip = strip->next) {
-								if (BLI_strcasestr(strip->name, ads->searchstr)) {
+								if (name_matches_dopesheet_filter(ads, strip->name)) {
 									strip_ok = true;
 									break;
 								}
@@ -1520,7 +1551,7 @@ static size_t animdata_filter_gpencil_layers_data(ListBase *anim_data, bDopeShee
 				if (!(filter_mode & ANIMFILTER_ACTIVE) || (gpl->flag & GP_LAYER_ACTIVE)) {
 					/* skip layer if the name doesn't match the filter string */
 					if ((ads) && (ads->filterflag & ADS_FILTER_BY_FCU_NAME)) {
-						if (BLI_strcasestr(gpl->info, ads->searchstr) == NULL)
+						if (name_matches_dopesheet_filter(ads, gpl->info) == false)
 							continue;
 					}
 					

source/blender/makesdna/DNA_action_types.h

@@ -606,7 +606,9 @@ typedef enum eDopeSheet_FilterFlag {
 /* DopeSheet general flags */
 typedef enum eDopeSheet_Flag {
 	ADS_FLAG_SUMMARY_COLLAPSED  = (1 << 0),   /* when summary is shown, it is collapsed, so all other channels get hidden */
-	ADS_FLAG_SHOW_DBFILTERS     = (1 << 1)    /* show filters for datablocks */
+	ADS_FLAG_SHOW_DBFILTERS     = (1 << 1),   /* show filters for datablocks */
+
+	ADS_FLAG_FUZZY_NAMES        = (1 << 2),   /* use fuzzy/partial string matches when ADS_FILTER_BY_FCU_NAME is enabled (WARNING: expensive operation) */
 	
 	/* NOTE: datablock filter flags continued (1 << 10) onwards... */
 } eDopeSheet_Flag;

source/blender/makesrna/intern/rna_action.c

@@ -357,6 +357,14 @@ static void rna_def_dopesheet(BlenderRNA *brna)
 	RNA_def_property_flag(prop, PROP_TEXTEDIT_UPDATE);
 	RNA_def_property_update(prop, NC_ANIMATION | ND_ANIMCHAN | NA_EDITED, NULL);
 	
+	/* Multi-word fuzzy search option for name/text filters */
+	prop = RNA_def_property(srna, "use_multi_word_filter", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", ADS_FLAG_FUZZY_NAMES);
+	RNA_def_property_ui_text(prop, "Multi-Word Fuzzy Filter",
+	                         "Perform fuzzy/multi-word matching (WARNING: May be slow)");
+	RNA_def_property_ui_icon(prop, ICON_SORTALPHA, 0);
+	RNA_def_property_update(prop, NC_ANIMATION | ND_ANIMCHAN | NA_EDITED, NULL);
+	
 	/* NLA Specific Settings */
 	prop = RNA_def_property(srna, "show_missing_nla", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "filterflag", ADS_FILTER_NLA_NOACT);