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[tracker/guarantee: 2/2] libtracker-extract: Added -guarantee module

commit 8f934a6971408d571c54d337ecc98aa1b302bbd9
Author: Martyn Russell <martyn lanedo com>
Date:   Fri Dec 10 12:19:30 2010 +0000

    libtracker-extract: Added -guarantee module
    
    This is designed to use an existing value or guarantee a value from
    the file in some way (in most cases).
    
    For now this module just does the guessing, next will come the
    checking existing values

 src/libtracker-extract/Makefile.am               |    3 +
 src/libtracker-extract/tracker-extract.h         |    1 +
 src/libtracker-extract/tracker-guarantee.c       |   93 ++++++++++++++++++++++
 src/libtracker-extract/tracker-guarantee.h       |   36 ++++++++
 src/tracker-extract/tracker-extract-flac.c       |   17 +---
 src/tracker-extract/tracker-extract-gif.c        |   17 +---
 src/tracker-extract/tracker-extract-gstreamer.c  |   30 ++------
 src/tracker-extract/tracker-extract-gupnp-dlna.c |   30 ++------
 src/tracker-extract/tracker-extract-jpeg.c       |   17 +---
 src/tracker-extract/tracker-extract-mp3.c        |   18 +----
 src/tracker-extract/tracker-extract-png.c        |   22 +-----
 src/tracker-extract/tracker-extract-tiff.c       |   17 +---
 12 files changed, 165 insertions(+), 136 deletions(-)
---
diff --git a/src/libtracker-extract/Makefile.am b/src/libtracker-extract/Makefile.am
index de9f2f5..e4b691e 100644
--- a/src/libtracker-extract/Makefile.am
+++ b/src/libtracker-extract/Makefile.am
@@ -15,6 +15,8 @@ libtracker_extract_ TRACKER_API_VERSION@_la_SOURCES =  \
 	tracker-data.h                                 \
 	tracker-exif.c                                 \
 	tracker-exif.h                                 \
+	tracker-guarantee.c                            \
+	tracker-guarantee.h                            \
 	tracker-iptc.c                                 \
 	tracker-iptc.h                                 \
 	tracker-utils.c                                \
@@ -27,6 +29,7 @@ libtracker_extractinc_HEADERS =                        \
 	tracker-data.h                                 \
 	tracker-exif.h                                 \
 	tracker-extract.h                              \
+	tracker-guarantee.h                            \
 	tracker-iptc.h                                 \
 	tracker-utils.h                                \
 	tracker-xmp.h
diff --git a/src/libtracker-extract/tracker-extract.h b/src/libtracker-extract/tracker-extract.h
index 835fda2..ad25fdc 100644
--- a/src/libtracker-extract/tracker-extract.h
+++ b/src/libtracker-extract/tracker-extract.h
@@ -26,6 +26,7 @@
 
 #include "tracker-data.h"
 #include "tracker-exif.h"
+#include "tracker-guarantee.h"
 #include "tracker-iptc.h"
 #include "tracker-utils.h"
 #include "tracker-xmp.h"
diff --git a/src/libtracker-extract/tracker-guarantee.c b/src/libtracker-extract/tracker-guarantee.c
new file mode 100644
index 0000000..bb5374a
--- /dev/null
+++ b/src/libtracker-extract/tracker-guarantee.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2009, Nokia <ivan frade nokia com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <glib.h>
+
+#include <libtracker-common/tracker-common.h>
+
+#include "tracker-guarantee.h"
+
+/**
+ * tracker_guarantee_title_from_filename:
+ * @uri: a string representing a URI to use
+ *
+ * Parses the filename pointed to by @uri and uses the basename
+ * (before the "." and extension of the file) as the title. If the
+ * title has any "_" characters, they are also converted into spaces.
+ *
+ * Returns: A newly allocated string which must be freed with g_free()
+ * or %NULL on error.
+ *
+ * Since: 0.10
+ **/
+gchar *
+tracker_guarantee_title_from_filename (const gchar *uri)
+{
+	gchar *filename;
+	gchar *basename;
+	gchar *p;
+
+	g_return_val_if_fail (uri != NULL, NULL);
+
+	filename = g_filename_from_uri (uri, NULL, NULL);
+	basename = g_filename_display_basename (filename);
+	g_free (filename);
+
+	p = strchr (basename, '.');
+	if (p) {
+		*p = '\0';
+	}
+
+	return g_strdelimit (basename, "_", ' ');
+
+}
+
+/**
+ * tracker_guarantee_date_from_filename_mtime:
+ * @uri: a string representing a URI to use
+ *
+ * Calls stat() on the filename pointed to by @uri to create a date
+ * based on the file's mtime.
+ *
+ * Returns: A newly allocated string which must be freed with g_free()
+ * or %NULL on error. The string represents the date in ISO8160.
+ *
+ * Since: 0.10
+ **/
+gchar *
+tracker_guarantee_date_from_filename_mtime (const gchar *uri)
+{
+	gchar *filename;
+	gchar *date;
+	guint64 mtime;
+
+	g_return_val_if_fail (uri != NULL, NULL);
+
+	filename = g_filename_from_uri (uri, NULL, NULL);
+	mtime = tracker_file_get_mtime (filename);
+	g_free (filename);
+
+	date = tracker_date_to_string ((time_t) mtime);
+
+	return date;
+}
diff --git a/src/libtracker-extract/tracker-guarantee.h b/src/libtracker-extract/tracker-guarantee.h
new file mode 100644
index 0000000..a215ccc
--- /dev/null
+++ b/src/libtracker-extract/tracker-guarantee.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2009, Nokia <ivan frade nokia com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include <stdio.h>
+
+#ifndef __LIBTRACKER_EXTRACT_GUARANTEE__
+#define __LIBTRACKER_EXTRACT_GUARANTEE_H__
+
+#if !defined (__LIBTRACKER_EXTRACT_INSIDE__) && !defined (TRACKER_COMPILATION)
+#error "only <libtracker-extract/tracker-extract.h> must be included directly."
+#endif
+
+G_BEGIN_DECLS
+
+gchar *tracker_guarantee_title_from_filename      (const gchar *uri);
+gchar *tracker_guarantee_date_from_filename_mtime (const gchar *uri);
+
+G_END_DECLS
+
+#endif /*  __LIBTRACKER_EXTRACT_GUARANTEE_H__ */
diff --git a/src/tracker-extract/tracker-extract-flac.c b/src/tracker-extract/tracker-extract-flac.c
index 4cbb63a..9d5cc1f 100644
--- a/src/tracker-extract/tracker-extract-flac.c
+++ b/src/tracker-extract/tracker-extract-flac.c
@@ -326,17 +326,10 @@ extract_flac (const gchar          *uri,
 	add_tuple (metadata, "nie:title", fd.title);
 #ifdef GUARANTEE_METADATA
 	if (!fd.title) {
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		add_tuple (metadata, "nie:title", title);
-
 		g_free (title);
 	}
 #endif
@@ -394,13 +387,9 @@ extract_flac (const gchar          *uri,
 #ifdef GUARANTEE_METADATA
 	if (!fd.date) {
 		gchar *date;
-		guint64 mtime;
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		add_tuple (metadata, "nie:contentCreated", date);
-
 		g_free (date);
 	}
 #endif
diff --git a/src/tracker-extract/tracker-extract-gif.c b/src/tracker-extract/tracker-extract-gif.c
index 08ee8ec..545f59f 100644
--- a/src/tracker-extract/tracker-extract-gif.c
+++ b/src/tracker-extract/tracker-extract-gif.c
@@ -236,14 +236,10 @@ read_metadata (TrackerSparqlBuilder *preupdate,
 #ifdef GUARANTEE_METADATA
 	else {
 		gchar *date;
-		guint64 mtime;
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:contentCreated");
 		tracker_sparql_builder_object_unvalidated (metadata, date);
-
 		g_free (date);
 	}
 #endif
@@ -289,18 +285,11 @@ read_metadata (TrackerSparqlBuilder *preupdate,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:title");
 		tracker_sparql_builder_object_unvalidated (metadata, title);
-
 		g_free (title);
 	}
 #endif
diff --git a/src/tracker-extract/tracker-extract-gstreamer.c b/src/tracker-extract/tracker-extract-gstreamer.c
index 324d3c9..648f392 100644
--- a/src/tracker-extract/tracker-extract-gstreamer.c
+++ b/src/tracker-extract/tracker-extract-gstreamer.c
@@ -312,19 +312,12 @@ add_y_date_gst_tag (TrackerSparqlBuilder  *metadata,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar *datestr;
-		guint64 mtime;
-
-		gchar  *filename = g_filename_from_uri (uri, NULL, NULL);
-
-		mtime = tracker_file_get_mtime (filename);
-		datestr = tracker_date_to_string ((time_t) mtime);
+		gchar *date;
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, key);
-		tracker_sparql_builder_object_unvalidated (metadata, datestr);
-
-		g_free (datestr);
-		g_free (filename);
+		tracker_sparql_builder_object_unvalidated (metadata, date);
+		g_free (date);
 	}
 #endif
 
@@ -788,20 +781,11 @@ extract_metadata (MetadataExtractor      *extractor,
 		}
 #ifdef GUARANTEE_METADATA
 		else {	
-			gchar  *filename = g_filename_from_uri (uri, NULL, NULL);
-			gchar  *basename = g_filename_display_basename (filename);
-			gchar **parts    = g_strsplit (basename, ".", -1);
-			gchar  *title    = g_strdup (parts[0]);
-			
-			g_strfreev (parts);
-			g_free (basename);
-			g_free (filename);
-			
-			title = g_strdelimit (title, "_", ' ');
-			
+			gchar *title;
+
+			title = tracker_guarantee_title_from_filename (uri);
 			tracker_sparql_builder_predicate (metadata, "nie:title");
 			tracker_sparql_builder_object_unvalidated (metadata, title);
-			
 			g_free (title);
 		}
 #endif
diff --git a/src/tracker-extract/tracker-extract-gupnp-dlna.c b/src/tracker-extract/tracker-extract-gupnp-dlna.c
index f690a79..4b1b0de 100644
--- a/src/tracker-extract/tracker-extract-gupnp-dlna.c
+++ b/src/tracker-extract/tracker-extract-gupnp-dlna.c
@@ -294,19 +294,12 @@ add_y_date_gst_tag (TrackerSparqlBuilder  *metadata,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar *datestr;
-		guint64 mtime;
-
-		gchar  *filename = g_filename_from_uri (uri, NULL, NULL);
-
-		mtime = tracker_file_get_mtime (filename);
-		datestr = tracker_date_to_string ((time_t) mtime);
+		gchar *date;
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, key);
-		tracker_sparql_builder_object_unvalidated (metadata, datestr);
-
-		g_free (datestr);
-		g_free (filename);
+		tracker_sparql_builder_object_unvalidated (metadata, date);
+		g_free (date);
 	}
 #endif
 }
@@ -629,20 +622,11 @@ extract_metadata (MetadataExtractor      *extractor,
 		}
 #ifdef GUARANTEE_METADATA
 		else {	
-			gchar  *filename = g_filename_from_uri (uri, NULL, NULL);
-			gchar  *basename = g_filename_display_basename (filename);
-			gchar **parts    = g_strsplit (basename, ".", -1);
-			gchar  *title    = g_strdup (parts[0]);
-			
-			g_strfreev (parts);
-			g_free (basename);
-			g_free (filename);
-			
-			title = g_strdelimit (title, "_", ' ');
-			
+			gchar *title;
+
+			title = tracker_guarantee_title_from_filename (uri);
 			tracker_sparql_builder_predicate (metadata, "nie:title");
 			tracker_sparql_builder_object_unvalidated (metadata, title);
-			
 			g_free (title);
 		}
 #endif
diff --git a/src/tracker-extract/tracker-extract-jpeg.c b/src/tracker-extract/tracker-extract-jpeg.c
index 7047ee3..133eb11 100644
--- a/src/tracker-extract/tracker-extract-jpeg.c
+++ b/src/tracker-extract/tracker-extract-jpeg.c
@@ -409,18 +409,11 @@ extract_jpeg (const gchar          *uri,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:title");
 		tracker_sparql_builder_object_unvalidated (metadata, title);
-
 		g_free (title);
 	}
 #endif
@@ -499,14 +492,10 @@ extract_jpeg (const gchar          *uri,
 #ifdef GUARANTEE_METADATA
 	else {
 		gchar *date;
-		guint64 mtime;
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:contentCreated");
 		tracker_sparql_builder_object_unvalidated (metadata, date);
-
 		g_free (date);
 	}
 #endif
diff --git a/src/tracker-extract/tracker-extract-mp3.c b/src/tracker-extract/tracker-extract-mp3.c
index 71e821d..6d72ad0 100644
--- a/src/tracker-extract/tracker-extract-mp3.c
+++ b/src/tracker-extract/tracker-extract-mp3.c
@@ -2275,18 +2275,11 @@ extract_mp3 (const gchar          *uri,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:title");
 		tracker_sparql_builder_object_unvalidated (metadata, title);
-
 		g_free (title);
 	}
 #endif
@@ -2321,19 +2314,14 @@ extract_mp3 (const gchar          *uri,
 #ifdef GUARANTEE_METADATA
 	else {
 		gchar *date;
-		guint64 mtime;
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:contentCreated");
 		tracker_sparql_builder_object_unvalidated (metadata, date);
-
 		g_free (date);
 	}
 #endif
 
-
 	if (md.genre) {
 		tracker_sparql_builder_predicate (metadata, "nfo:genre");
 		tracker_sparql_builder_object_unvalidated (metadata, md.genre);
diff --git a/src/tracker-extract/tracker-extract-png.c b/src/tracker-extract/tracker-extract-png.c
index 080754d..f747ad3 100644
--- a/src/tracker-extract/tracker-extract-png.c
+++ b/src/tracker-extract/tracker-extract-png.c
@@ -248,18 +248,11 @@ read_metadata (TrackerSparqlBuilder *preupdate,
 #ifdef GUARANTEE_METADATA
 	else {
 		gchar *date;
-		guint64 mtime;
-
-		gchar *filename = g_filename_from_uri (uri, NULL, NULL);
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:contentCreated");
 		tracker_sparql_builder_object_unvalidated (metadata, date);
-
 		g_free (date);
-		g_free (filename);
 	}
 #endif
 	if (md.description) {
@@ -278,20 +271,11 @@ read_metadata (TrackerSparqlBuilder *preupdate,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar *filename = g_filename_from_uri (uri, NULL, NULL);
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-		g_free (filename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:title");
 		tracker_sparql_builder_object_unvalidated (metadata, title);
-
 		g_free (title);
 	}
 #endif
diff --git a/src/tracker-extract/tracker-extract-tiff.c b/src/tracker-extract/tracker-extract-tiff.c
index 5c743da..2191047 100644
--- a/src/tracker-extract/tracker-extract-tiff.c
+++ b/src/tracker-extract/tracker-extract-tiff.c
@@ -604,18 +604,11 @@ extract_tiff (const gchar          *uri,
 	}
 #ifdef GUARANTEE_METADATA
 	else {
-		gchar  *basename = g_filename_display_basename (filename);
-		gchar **parts    = g_strsplit (basename, ".", -1);
-		gchar  *title    = g_strdup (parts[0]);
-
-		g_strfreev (parts);
-		g_free (basename);
-
-		title = g_strdelimit (title, "_", ' ');
+		gchar *title;
 
+		title = tracker_guarantee_title_from_filename (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:title");
 		tracker_sparql_builder_object_unvalidated (metadata, title);
-
 		g_free (title);
 	}
 #endif
@@ -682,14 +675,10 @@ extract_tiff (const gchar          *uri,
 #ifdef GUARANTEE_METADATA
 	else {
 		gchar *date;
-		guint64 mtime;
-
-		mtime = tracker_file_get_mtime (filename);
-		date = tracker_date_to_string ((time_t) mtime);
 
+		date = tracker_guarantee_date_from_filename_mtime (uri);
 		tracker_sparql_builder_predicate (metadata, "nie:contentCreated");
 		tracker_sparql_builder_object_unvalidated (metadata, date);
-
 		g_free (date);
 	}
 #endif
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