X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=mood.c;h=239911fd50538322b844888687c587df02f9a51b;hp=8d257e0cd9768b4b3fb6000cf76f6e7edb2039ab;hb=8ea8abb73199b32fdd7afdf8825afa42ed8de244;hpb=f7fb539505316b2cd8c5e57b6529d43b936208fb

diff --git a/mood.c b/mood.c
index 8d257e0c..239911fd 100644
--- a/mood.c
+++ b/mood.c
@@ -1,33 +1,39 @@
 /*
- * Copyright (C) 2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file mood.c Paraslash's mood handling functions. */
 
+#include <time.h>
+#include <regex.h>
+#include <fnmatch.h>
+#include <osl.h>
+
 #include "para.h"
 #include "error.h"
+#include "string.h"
 #include "afh.h"
 #include "afs.h"
 #include "list.h"
-#include "string.h"
+#include "ipc.h"
 
 /**
  * Contains statistical data of the currently admissible audio files.
  *
- * It is used to assign normalized score values to each admissbile audio file.
+ * It is used to assign normalized score values to each admissible audio file.
  */
 struct afs_statistics {
-	/** sum of num played over all admissible files */
+	/** Sum of num played over all admissible files. */
 	int64_t num_played_sum;
-	/** sum of last played times over all admissible files */
+	/** Sum of last played times over all admissible files. */
 	int64_t last_played_sum;
-	/** quadratic deviation of num played time */
+	/** Quadratic deviation of num played time. */
 	int64_t num_played_qd;
-	/** quadratic deviation of last played time */
+	/** Quadratic deviation of last played time. */
 	int64_t last_played_qd;
-	/** number of admissible files */
+	/** Number of admissible files */
 	unsigned num;
 };
 struct afs_statistics statistics;
@@ -35,21 +41,21 @@ struct afs_statistics statistics;
 /**
  * Assign scores according to a mood_method.
  *
- * Each mood_method has its own mood_score_function. The first parameter passed
- * to that function is a pointer to a row of the audio file table.  It
- * determines the audio file for which a score is to be assigned.  The second
- * argument depends on the mood method this function is used for. It usually is
- * the argument given at the end of a mood line.
+ * Each mood_method has its own mood_score_function. The first three parameters
+ * passed to that function are informations about the audio file whose score is
+ * to be computed. The data argument depends on the mood method this function
+ * is used for. It usually is the argument given at the end of a mood line.
  *
- * Mood score functions must return values between -100 and +100 inclisively.
+ * Mood score functions must return values between -100 and +100 inclusively.
  * Boolean score functions should always return either -100 or +100.
  *
  * \sa struct mood_method, mood_parser.
  */
-typedef int mood_score_function(const struct osl_row*, void *);
+typedef int mood_score_function(const char *path, const struct afs_info *afsi,
+		const struct afh_info *afhi, const void *data);
 
 /**
- * Preprocess a mood line.
+ * Pre-process a mood line.
  *
  * The mood_parser of a mood_method is called once at mood open time for each
  * line of the current mood definition that contains the mood_method's name as
@@ -57,14 +63,14 @@ typedef int mood_score_function(const struct osl_row*, void *);
  * mood_parser must determine whether the line is syntactically correct and
  * return a positive value if so and a negative value otherwise.
  *
- * Some mood parsers preprocess the data given in the mood line to compute a
+ * Some mood parsers pre-process the data given in the mood line to compute a
  * structure which depends of the particular mood_method and which is used
  * later in the mood_score_function of the mood_method. The mood_parser may
- * store a pointer to its structure via the second argument.
+ * store a pointer to its structure via the void** pointer.
  *
  * \sa mood_open(), mood_cleanup_function, mood_score_function.
  */
-typedef int mood_parser(const char *, void **);
+typedef int mood_parser(int, char **, void **);
 
 /**
  * Deallocate resources which were allocated by the mood_parser.
@@ -82,7 +88,7 @@ typedef void mood_cleanup_function(void *);
  * Used for scoring and to determine whether a file is admissible.
  */
 struct mood_method {
-	/* The name of the method. */
+	/** The name of the method. */
 	const char *name;
 	/** Pointer to the mood parser. */
 	mood_parser *parser;
@@ -101,7 +107,7 @@ struct mood_item {
 	/** The data structure computed by the mood parser. */
 	void *parser_data;
 	/** The given score value, or zero if none was given. */
-	long score_arg;
+	int32_t score_arg;
 	/** Non-zero if random scoring was requested. */
 	int random_score;
 	/** Whether the "not" keyword was given in the mood line. */
@@ -115,13 +121,13 @@ struct mood_item {
  *
  * When a mood is opened, each line of its definition is investigated, and a
  * corresponding mood item is produced. Each mood line starts with \p accept,
- * \p deny, or \p score which determins the type of the mood line.  For each
+ * \p deny, or \p score which determines the type of the mood line.  For each
  * such type a linked list is maintained whose entries are the mood items.
  *
  * \sa mood_item, mood_open().
  */
 struct mood {
-	/** the name of this mood */
+	/** The name of this mood. */
 	char *name;
 	/** The list of mood items of type \p accept. */
 	struct list_head accept_list;
@@ -162,95 +168,233 @@ static uint64_t int_sqrt(uint64_t x)
 	return res;
 }
 
-static int mm_played_rarely_score_function(const struct osl_row *row,
-	__a_unused void *ignored)
+#define MOOD_COMPARATORS \
+	MC(LESS, <) \
+	MC(LESS_OR_EQUAL, <=) \
+	MC(EQUAL, =) \
+	MC(EQUAL2, ==) \
+	MC(NOT_EQUAL, !=) \
+	MC(NOT_EQUAL2, <>) \
+	MC(GREATER, >) \
+	MC(GREATER_OR_EQUAL, >=) \
+
+#define MC(a, b) MC_ ## a,
+enum mood_comparator_id {MOOD_COMPARATORS NUM_MOOD_COMPARATORS};
+#undef MC
+#define MC(a, b) # b,
+const char const *mood_comparators[] = {MOOD_COMPARATORS};
+#undef MC
+
+static int parse_mood_comparator(const char *word)
 {
-	struct afs_info afsi;
-	unsigned num;
-	int ret = get_afsi_of_row(row, &afsi);
+	int i;
 
+	for (i = 0; i < NUM_MOOD_COMPARATORS; i++)
+		if (!strcmp(word, mood_comparators[i]))
+			return i;
+	return -E_MOOD_SYNTAX;
+}
+
+static int compare_int32(int32_t a, int32_t b, enum mood_comparator_id id)
+{
+	int res;
+
+	switch (id) {
+	case MC_LESS:
+		res = a < b; break;
+	case MC_LESS_OR_EQUAL:
+		res = a <= b; break;
+	case MC_EQUAL:
+	case MC_EQUAL2:
+		res = a == b; break;
+	case MC_NOT_EQUAL:
+	case MC_NOT_EQUAL2:
+		res = a != b; break;
+	case MC_GREATER:
+		res = a > b; break;
+	case MC_GREATER_OR_EQUAL:
+		res = a >= b; break;
+	default:
+		PARA_EMERG_LOG("BUG: invalid mood comparator\n");
+		exit(EXIT_FAILURE);
+	}
+	return res? 100 : -100;
+}
+
+struct mm_year_data {
+	/** The year given at the mood line. */
+	int32_t year;
+	/** Used to detect Y2K issues. */
+	int32_t current_year;
+	/** <, <=, =, !=, >=, or >. */
+	enum mood_comparator_id id;
+};
+
+static int mm_year_parser(int argc, char **argv, void **private)
+{
+	int ret = -E_MOOD_SYNTAX;
+	struct mm_year_data *mmyd = para_malloc(sizeof(*mmyd));
+	time_t current_time;
+	struct tm *gmt;
+
+	if (argc != 2)
+		goto err;
+	ret = parse_mood_comparator(argv[1]);
+	mmyd->id = ret;
 	if (ret < 0)
-		return 0;
-	ret = get_num_admissible_files(&num);
+		goto err;
+	ret = para_atoi32(argv[2], &mmyd->year);
 	if (ret < 0)
-		return 0;
-	if (statistics.num_played_sum - num * afsi.num_played
-			> int_sqrt(statistics.num_played_qd * num))
-		return 100;
-	return -100;
+		goto err;
+	current_time = time(NULL);
+	gmt = gmtime(&current_time);
+	/* tm_year is the number of years since 1900 */
+	mmyd->current_year = gmt->tm_year + 1900;
+	*private = mmyd;
+	return 1;
+err:
+	free(mmyd);
+	return ret;
 }
 
-static int mm_played_rarely_parser(const char *arg, __a_unused void **ignored)
+static int mm_year_score_function(__a_unused const char *path,
+		__a_unused const struct afs_info *afsi,
+		const struct afh_info *afhi,
+		const void *private)
 {
-	if (*arg)
-		PARA_WARNING_LOG("ignored junk at eol: %s\n", arg);
-	return 1;
+	const struct mm_year_data *mmyd = private;
+	int32_t tag_year;
+	int ret = para_atoi32(afhi->tags.year, &tag_year);
+
+	if (ret < 0) /* year tag not present or not a number */
+		return -100;
+	if (tag_year < 0)
+		return -100;
+	/* try to work around Y2K issues */
+	if (tag_year < 100) {
+		tag_year += 1900;
+		if (tag_year + 100 <= mmyd->current_year)
+			tag_year += 100; /* assume tag_year >= 2000 */
+	}
+	return compare_int32(tag_year, mmyd->year, mmyd->id);
 }
 
-static int mm_name_like_score_function(const struct osl_row *row, void *preg)
+static void mm_year_cleanup(void *private)
 {
-	char *path;
-	int ret = get_audio_file_path_of_row(row, &path);
+	free(private);
+}
+
+static int mm_no_attributes_set_parser(int argc, __a_unused char **argv,
+		__a_unused void **ignored)
+{
+	return argc? -E_MOOD_SYNTAX : 1;
+}
+
+static int mm_no_attributes_set_score_function(__a_unused const char *path,
+		const struct afs_info *afsi,
+		__a_unused const struct afh_info *afhi,
+		__a_unused const void *data)
+{
+	if (!afsi->attributes)
+		return 100;
+	return -100;
+}
+
+static int mm_played_rarely_score_function(__a_unused const char *path,
+		const struct afs_info *afsi,
+		__a_unused const struct afh_info *afhi,
+		__a_unused const void *data)
+{
+	unsigned num;
+	int ret = get_num_admissible_files(&num);
 
 	if (ret < 0)
 		return 0;
-	ret = regexec((regex_t *)preg, path, 42, NULL, 0);
-	return (ret == REG_NOMATCH)? -100 : 100;
+	if (statistics.num_played_sum - num * afsi->num_played
+			> int_sqrt(statistics.num_played_qd * num))
+		return 100;
+	return -100;
 }
 
-static int mm_name_like_parser(const char *arg, void **regex)
+static int mm_played_rarely_parser(int argc, __a_unused char **argv,
+		__a_unused void **ignored)
 {
-	regex_t *preg = para_malloc(sizeof(*preg));
-	int ret = regcomp(preg, arg, REG_NOSUB);
-
-	if (ret) {
-		free(preg);
-		return -E_MOOD_REGEX;
-	}
-	*regex = preg;
-	return 1;
+	return argc? -E_MOOD_SYNTAX : 1;
 }
 
-static void mm_name_like_cleanup(void *preg)
+static int mm_path_matches_score_function(const char *path,
+		__a_unused const struct afs_info *afsi,
+		__a_unused const struct afh_info *afhi,
+		const void *data)
 {
-	regfree(preg);
-	free(preg);
+	if (fnmatch(data, path, 0))
+		return -100;
+	return 100;
 }
 
-static int mm_is_set_parser(const char *arg, void **bitnum)
+static int mm_path_matches_parser(int argc, char **argv, void **data)
 {
-	unsigned char *c = para_malloc(1);
-	int ret = get_attribute_bitnum_by_name(arg, c);
+	if (argc != 1)
+		return -E_MOOD_SYNTAX;
+	*data = para_strdup(argv[1]);
+	return 1;
+}
 
-	if (ret >= 0)
-		*bitnum = c;
-	else
-		free(c);
-	return ret;
+static void mm_path_matches_cleanup(void *data)
+{
+	free(data);
 }
 
-static int mm_is_set_score_function(const struct osl_row *row, void *bitnum)
+static int mm_is_set_parser(int argc, char **argv, void **bitnum)
 {
-	unsigned char *bn = bitnum;
-	struct afs_info afsi;
-	int ret = get_afsi_of_row(row, &afsi);
+	int ret;
+	unsigned char c, *res;
 
+	if (argc != 1)
+		return -E_MOOD_SYNTAX;
+	ret = get_attribute_bitnum_by_name(argv[1], &c);
 	if (ret < 0)
-		return 0;
-	if (afsi.attributes & (1ULL << *bn))
+		return ret;
+	res = para_malloc(1);
+	*res = c;
+	*bitnum = res;
+	return 1;
+}
+
+static int mm_is_set_score_function(__a_unused const char *path,
+		__a_unused const struct afs_info *afsi,
+		__a_unused const struct afh_info *afhi,
+		const void *data)
+{
+	const unsigned char *bn = data;
+	if (afsi->attributes & (1ULL << *bn))
 		return 100;
 	return -100;
 }
 
-/* returns 1 if row matches score item, -1 otherwise */
+/* returns 1 if row matches score item, negative otherwise */
 static int add_item_score(const struct osl_row *row, struct mood_item *item, long *score,
 		long *score_arg_sum)
 {
-	int ret = 100;
+	struct afs_info afsi;
+	struct afh_info afhi;
+	char *path;
+	int ret;
 
 	*score_arg_sum += item->random_score? 100 : PARA_ABS(item->score_arg);
+	ret = 100;
 	if (item->method) {
-		ret = item->method->score_function(row, item->parser_data);
+		ret = get_afsi_of_row(row, &afsi);
+		if (ret< 0)
+			return ret;
+		ret = get_afhi_of_row(row, &afhi);
+		if (ret< 0)
+			return ret;
+		ret = get_audio_file_path_of_row(row, &path);
+		if (ret< 0)
+			return ret;
+		ret = item->method->score_function(path, &afsi, &afhi,
+			item->parser_data);
 		if ((ret < 0 && !item->logical_not) || (ret >= 0 && item->logical_not))
 			return -1; /* no match */
 	}
@@ -261,52 +405,49 @@ static int add_item_score(const struct osl_row *row, struct mood_item *item, lon
 	return 1;
 }
 
-static int compute_mood_score(const struct osl_row *row, long *result)
+static int compute_mood_score(const struct osl_row *aft_row, struct mood *m,
+		long *result)
 {
 	struct mood_item *item;
 	int match = 0;
 	long score_arg_sum = 0, score = 0;
 
-	if (!current_mood)
+	if (!m)
 		return -E_NO_MOOD;
 	/* reject audio file if it matches any entry in the deny list */
-	list_for_each_entry(item, &current_mood->deny_list, mood_item_node)
-		if (add_item_score(row, item, &score, &score_arg_sum) > 0)
+	list_for_each_entry(item, &m->deny_list, mood_item_node)
+		if (add_item_score(aft_row, item, &score, &score_arg_sum) > 0)
 			return -E_NOT_ADMISSIBLE;
-	list_for_each_entry(item, &current_mood->accept_list, mood_item_node)
-		if (add_item_score(row, item, &score, &score_arg_sum) > 0)
+	list_for_each_entry(item, &m->accept_list, mood_item_node)
+		if (add_item_score(aft_row, item, &score, &score_arg_sum) > 0)
 			match = 1;
 	/* reject if there is no matching entry in the accept list */
-	if (!match && !list_empty(&current_mood->accept_list))
+	if (!match && !list_empty(&m->accept_list))
 		return -E_NOT_ADMISSIBLE;
-	list_for_each_entry(item, &current_mood->score_list, mood_item_node)
-		add_item_score(row, item, &score, &score_arg_sum);
+	list_for_each_entry(item, &m->score_list, mood_item_node)
+		add_item_score(aft_row, item, &score, &score_arg_sum);
 	if (score_arg_sum)
 		score /= score_arg_sum;
 	*result = score;
 	return 1;
 }
 
+#define DEFINE_MOOD_METHOD(_name) \
+.parser = mm_ ## _name ## _parser, \
+.score_function = mm_ ## _name ## _score_function, \
+.name = #_name
+
+#define DEFINE_MOOD_METHOD_WITH_CLEANUP(_name) \
+	DEFINE_MOOD_METHOD(_name), \
+	.cleanup = mm_ ## _name ## _cleanup
+
 static const struct mood_method mood_methods[] = {
-{
-	.parser = mm_played_rarely_parser,
-	.score_function = mm_played_rarely_score_function,
-	.name = "played_rarely"
-},
-{
-	.parser = mm_is_set_parser,
-	.score_function = mm_is_set_score_function,
-	.name = "is_set"
-},
-{
-	.parser = mm_name_like_parser,
-	.score_function = mm_name_like_score_function,
-	.cleanup = mm_name_like_cleanup,
-	.name = "name_like"
-},
-{
-	.parser = NULL
-}
+	{DEFINE_MOOD_METHOD(no_attributes_set)},
+	{DEFINE_MOOD_METHOD(played_rarely)},
+	{DEFINE_MOOD_METHOD(is_set)},
+	{DEFINE_MOOD_METHOD_WITH_CLEANUP(path_matches)},
+	{DEFINE_MOOD_METHOD_WITH_CLEANUP(year)},
+	{.parser = NULL}
 };
 
 static void cleanup_list_entry(struct mood_item *item)
@@ -357,6 +498,14 @@ enum mood_line_type {
 	ML_SCORE
 };
 
+/** Data passed to the parser of a mood line. */
+struct mood_line_parser_data {
+	/** The mood this mood line belongs to. */
+	struct mood *m;
+	/** The line number in the mood definition. */
+	unsigned line_num;
+};
+
 /*
  * <accept [with score <score>] | deny [with score <score>]  | score <score>>
  * 	[if] [not] <mood_method> [options]
@@ -366,18 +515,19 @@ enum mood_line_type {
 
 static int parse_mood_line(char *mood_line, void *data)
 {
-	struct mood *m = data;
+	struct mood_line_parser_data *mlpd = data;
 	char **argv;
-	char *delim = " \t";
 	unsigned num_words;
 	char **w;
 	int i, ret;
 	enum mood_line_type mlt = ML_INVALID;
 	struct mood_item *mi = NULL;
-	char *buf = para_strdup(mood_line);
 
-	num_words = split_args(buf, &argv, delim);
-	ret = 1;
+	mlpd->line_num++;
+	ret = create_argv(mood_line, " \t", &argv);
+	if (ret < 0)
+		return ret;
+	num_words = ret;
 	if (!num_words) /* empty line */
 		goto out;
 	w = argv;
@@ -398,11 +548,13 @@ static int parse_mood_line(char *mood_line, void *data)
 		w++;
 		if (!*w)
 			goto out;
-		if (!strcmp(*w, "with")) {
-			w++;
-			if (!*w)
-				goto out;
-		}
+		if (strcmp(*w, "with"))
+			goto check_for_if;
+		w++;
+		if (!*w)
+			goto out;
+		if (strcmp(*w, "score"))
+			goto out;
 	}
 	if (mlt == ML_SCORE || !strcmp(*w, "score")) {
 		ret = -E_MOOD_SYNTAX;
@@ -411,7 +563,7 @@ static int parse_mood_line(char *mood_line, void *data)
 			goto out;
 		if (strcmp(*w, "random")) {
 			mi->random_score = 0;
-			ret = para_atol(*w, &mi->score_arg);
+			ret = para_atoi32(*w, &mi->score_arg);
 			if (ret < 0)
 				goto out;
 		} else {
@@ -425,6 +577,7 @@ static int parse_mood_line(char *mood_line, void *data)
 	w++;
 	if (!*w)
 		goto out;
+check_for_if:
 	if (!strcmp(*w, "if")) {
 		ret = -E_MOOD_SYNTAX;
 		w++;
@@ -447,24 +600,25 @@ static int parse_mood_line(char *mood_line, void *data)
 	ret = -E_MOOD_SYNTAX;
 	if (!mood_methods[i].parser)
 		goto out;
-	w++;
-	ret = mood_methods[i].parser(*w, &mi->parser_data);
+	ret = mood_methods[i].parser(num_words - 1 - (w - argv), w,
+		&mi->parser_data);
 	if (ret < 0)
 		goto out;
 	mi->method = &mood_methods[i];
 success:
-	if (mlt == ML_ACCEPT)
-		para_list_add(&mi->mood_item_node, &m->accept_list);
-	else if (mlt == ML_DENY)
-		para_list_add(&mi->mood_item_node, &m->deny_list);
-	else
-		para_list_add(&mi->mood_item_node, &m->score_list);
+	if (mlpd->m) {
+		if (mlt == ML_ACCEPT)
+			para_list_add(&mi->mood_item_node, &mlpd->m->accept_list);
+		else if (mlt == ML_DENY)
+			para_list_add(&mi->mood_item_node, &mlpd->m->deny_list);
+		else
+			para_list_add(&mi->mood_item_node, &mlpd->m->score_list);
+	}
 	PARA_DEBUG_LOG("%s entry added, method: %p\n", mlt == ML_ACCEPT? "accept" :
 		(mlt == ML_DENY? "deny" : "score"), mi->method);
 	ret = 1;
 out:
-	free(argv);
-	free(buf);
+	free_argv(argv);
 	if (ret >= 0)
 		return ret;
 	if (mi) {
@@ -474,60 +628,82 @@ out:
 	return ret;
 }
 
-static int load_mood(const struct osl_row *row)
+static int load_mood(const struct osl_row *mood_row, struct mood **m)
 {
-	int ret;
-	struct mood *new_mood, *old_mood = current_mood;
-	struct osl_object objs[NUM_BLOB_COLUMNS];
+	char *mood_name;
+	struct osl_object mood_def;
+	struct mood_line_parser_data mlpd = {.line_num = 0};
+	int ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
 
-	ret = osl_get_object(moods_table, row, BLOBCOL_NAME, &objs[BLOBCOL_NAME]);
 	if (ret < 0)
 		return ret;
-	if (objs[BLOBCOL_NAME].size <= 1)
+	if (!*mood_name)
 		return -E_DUMMY_ROW;
-	ret = osl_open_disk_object(moods_table, row, BLOBCOL_DEF, &objs[BLOBCOL_DEF]);
-	if (ret < 0)
-		return ret;
-	new_mood = alloc_new_mood((char*)objs[BLOBCOL_NAME].data);
-	current_mood = new_mood;
-	ret = for_each_line_ro(objs[BLOBCOL_DEF].data, objs[BLOBCOL_DEF].size,
-		parse_mood_line, &current_mood);
-	osl_close_disk_object(&objs[BLOBCOL_DEF]);
+	mlpd.m = alloc_new_mood(mood_name);
+	ret = for_each_line_ro(mood_def.data, mood_def.size,
+		parse_mood_line, &mlpd);
+	osl_close_disk_object(&mood_def);
 	if (ret < 0) {
-		PARA_ERROR_LOG("unable to load mood %s: %d\n",
-			(char *)objs[BLOBCOL_NAME].data, ret);
-		destroy_mood(new_mood);
-		current_mood = old_mood;
+		PARA_ERROR_LOG("unable to load mood %s: %s\n", mlpd.m->name,
+			para_strerror(-ret));
+		destroy_mood(mlpd.m);
 		return ret;
 	}
-	destroy_mood(old_mood);
-	current_mood = new_mood;
-	PARA_INFO_LOG("loaded mood %s\n", current_mood->name);
+	*m = mlpd.m;
 	return 1;
 }
 
-/* returns -E_MOOD_LOADED on _success_ to terminate the loop */
-static int mood_loop(struct osl_row *row, __a_unused void *private_data)
+static int check_mood(struct osl_row *mood_row, void *data)
 {
-	int ret = load_mood(row);
+	struct para_buffer *pb = data;
+	char *mood_name;
+	struct osl_object mood_def;
+	struct mood_line_parser_data mlpd = {.line_num = 0};
+
+	int ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
+
 	if (ret < 0) {
-		if (ret != -E_DUMMY_ROW)
-			PARA_NOTICE_LOG("invalid mood (%d), trying next mood\n", ret);
-		return 1;
+		para_printf(pb, "failed to get mood definition: %s\n",
+			para_strerror(-ret));
+		return ret;
 	}
-	return -E_MOOD_LOADED;
+	if (!*mood_name) /* ignore dummy row */
+		goto out;
+	ret = para_printf(pb, "checking mood %s...\n", mood_name);
+	if (ret < 0)
+		goto out;
+	ret = for_each_line_ro(mood_def.data, mood_def.size,
+		parse_mood_line, &mlpd);
+	if (ret < 0)
+		para_printf(pb, "%s line %u: %s\n", mood_name, mlpd.line_num,
+			para_strerror(-ret));
+out:
+	osl_close_disk_object(&mood_def);
+	return ret;
 }
 
-static int load_first_available_mood(void)
+/**
+ * Check all moods for syntax errors.
+ *
+ * \param fd The afs socket.
+ * \param query Unused.
+ */
+void mood_check_callback(int fd, __a_unused const struct osl_object *query)
 {
-	int ret = osl_rbtree_loop(moods_table, BLOBCOL_NAME, NULL,
-		mood_loop);
-	if (ret == -E_MOOD_LOADED) /* success */
-		return 1;
+	struct para_buffer pb = {
+		.max_size = SHMMAX,
+		.private_data = &fd,
+		.max_size_handler = pass_buffer_as_shm
+	};
+
+	int ret = para_printf(&pb, "checking moods...\n");
 	if (ret < 0)
-		return ret; /* error */
-	PARA_NOTICE_LOG("no valid mood found\n");
-	return -E_NO_MOOD;
+		return;
+	osl_rbtree_loop(moods_table, BLOBCOL_ID, &pb,
+		check_mood);
+	if (pb.offset)
+		pass_buffer_as_shm(pb.buf, pb.offset, &fd);
+	free(pb.buf);
 }
 
 #if 0
@@ -663,6 +839,8 @@ struct admissible_file_info
 
 /** The temporary array of admissible files. */
 struct admissible_array {
+	/** Files are admissible wrt. this mood. */
+	struct mood *m;
 	/** The size of the array */
 	unsigned size;
 	/** Pointer to the array of admissible files. */
@@ -677,14 +855,13 @@ struct admissible_array {
  *
  * \return Negative on errors, positive on success.
  */
-static int add_if_admissible(struct osl_row *aft_row, void *private_data)
+static int add_if_admissible(struct osl_row *aft_row, void *data)
 {
+	struct admissible_array *aa = data;
 	int ret;
-	struct admissible_array *aa = private_data;
 	long score = 0;
 
-	score = 0;
-	ret = compute_mood_score(aft_row, &score);
+	ret = compute_mood_score(aft_row, aa->m, &score);
 	if (ret < 0)
 		return (ret == -E_NOT_ADMISSIBLE)? 1 : ret;
 	if (statistics.num >= aa->size) {
@@ -706,7 +883,7 @@ static int add_if_admissible(struct osl_row *aft_row, void *private_data)
  *
  * \param n Number of elements.
  * \param old_qd The quadratic deviation before the change.
- * \param old_val The value that was repaced.
+ * \param old_val The value that was replaced.
  * \param new_val The replacement value.
  * \param old_sum The sum of all elements before the update.
  *
@@ -778,19 +955,19 @@ static int delete_from_statistics_and_score_table(const struct osl_row *aft_row)
 }
 
 /**
- * Delete one entry from the statitics and from the score table.
+ * Delete one entry from the statistics and from the score table.
  *
  * \param aft_row The audio file which is no longer admissible.
  *
  * \return Positive on success, negative on errors.
  *
- * \sa score_delete(), mood_update_audio_file().
+ * \sa score_delete().
  */
-int mood_delete_audio_file(const struct osl_row *aft_row)
+static int mood_delete_audio_file(const struct osl_row *aft_row)
 {
 	int ret;
 
-	ret = row_belongs_to_score_table(aft_row);
+	ret = row_belongs_to_score_table(aft_row, NULL);
 	if (ret < 0)
 		return ret;
 	if (!ret) /* not admissible, nothing to do */
@@ -799,7 +976,7 @@ int mood_delete_audio_file(const struct osl_row *aft_row)
 }
 
 /**
- * Compute the new score of an audio file.
+ * Compute the new score of an audio file wrt. the current mood.
  *
  * \param aft_row Determines the audio file.
  * \param old_afsi The audio file selector info before updating.
@@ -809,19 +986,21 @@ int mood_delete_audio_file(const struct osl_row *aft_row)
  *
  * \return Positive on success, negative on errors.
  */
-int mood_update_audio_file(const struct osl_row *aft_row, struct afs_info *old_afsi)
+static int mood_update_audio_file(const struct osl_row *aft_row,
+		struct afs_info *old_afsi)
 {
 	long score, percent;
 	int ret, is_admissible, was_admissible = 0;
 	struct afs_info afsi;
+	unsigned rank;
 
 	if (!current_mood)
 		return 1; /* nothing to do */
-	ret = row_belongs_to_score_table(aft_row);
+	ret = row_belongs_to_score_table(aft_row, &rank);
 	if (ret < 0)
 		return ret;
 	was_admissible = ret;
-	ret = compute_mood_score(aft_row, &score);
+	ret = compute_mood_score(aft_row, current_mood, &score);
 	is_admissible = (ret > 0);
 	if (!was_admissible && !is_admissible)
 		return 1;
@@ -851,7 +1030,7 @@ int mood_update_audio_file(const struct osl_row *aft_row, struct afs_info *old_a
 		percent = 100;
 	else if (percent < 0)
 		percent = 0;
-	PARA_DEBUG_LOG("re-inserting at %lu%%\n", percent);
+	PARA_DEBUG_LOG("moving from rank %u to %lu%%\n", rank, percent);
 	return score_update(aft_row, percent);
 }
 
@@ -863,23 +1042,37 @@ static void log_statistics(void)
 		PARA_NOTICE_LOG("no admissible files\n");
 		return;
 	}
-	PARA_NOTICE_LOG("last_played mean: %lli, last_played sigma: %llu\n",
+	PARA_INFO_LOG("last_played mean: %lli, last_played sigma: %llu\n",
 		(long long int)(statistics.last_played_sum / n),
 		(long long unsigned)int_sqrt(statistics.last_played_qd / n));
-	PARA_NOTICE_LOG("num_played mean: %lli, num_played sigma: %llu\n",
+	PARA_INFO_LOG("num_played mean: %lli, num_played sigma: %llu\n",
 		(long long int)statistics.num_played_sum / n,
 		(long long unsigned)int_sqrt(statistics.num_played_qd / n));
 }
 
 /**
- * Open the given mood.
+ * Close the current mood.
+ *
+ * Free all resources of the current mood which were allocated during
+ * mood_open().
+ */
+void close_current_mood(void)
+{
+	destroy_mood(current_mood);
+	current_mood = NULL;
+	memset(&statistics, 0, sizeof(statistics));
+}
+
+
+/**
+ * Change the current mood.
  *
  * \param mood_name The name of the mood to open.
  *
- * There are two special cases: If \a mood_name is \a NULL, load the
- * first available mood. If \a mood_name is the empty string "", load
- * the dummy mood that accepts every audio file and uses a scoring method
- * based only on the \a last_played information.
+ * If \a mood_name is \a NULL, load the dummy mood that accepts every audio file
+ * and uses a scoring method based only on the \a last_played information.
+ *
+ * If there is already an open mood, it will be closed first.
  *
  * \return Positive on success, negative on errors. Loading the dummy mood
  * always succeeds.
@@ -887,7 +1080,7 @@ static void log_statistics(void)
  * \sa struct admissible_file_info, struct admissible_array, struct
  * afs_info::last_played, mood_close().
  */
-int mood_open(char *mood_name)
+int change_current_mood(char *mood_name)
 {
 	int i, ret;
 	struct admissible_array aa = {
@@ -895,61 +1088,46 @@ int mood_open(char *mood_name)
 		.array = NULL
 	};
 
-	if (!mood_name) {
-		ret = load_first_available_mood();
-		if (ret < 0)
-			return ret;
-	} else if (*mood_name) {
+	if (mood_name) {
+		struct mood *m;
 		struct osl_row *row;
 		struct osl_object obj = {
 			.data = mood_name,
 			.size = strlen(mood_name) + 1
 		};
-		ret = osl_get_row(moods_table, BLOBCOL_NAME, &obj, &row);
+		ret = osl(osl_get_row(moods_table, BLOBCOL_NAME, &obj, &row));
 		if (ret < 0) {
 			PARA_NOTICE_LOG("no such mood: %s\n", mood_name);
 			return ret;
 		}
-		ret = load_mood(row);
+		ret = load_mood(row, &m);
 		if (ret < 0)
 			return ret;
+		close_current_mood();
+		current_mood = m;
 	} else {
-		destroy_mood(current_mood);
+		close_current_mood();
 		current_mood = alloc_new_mood("dummy");
 	}
-	PARA_NOTICE_LOG("loaded mood %s\n", current_mood->name);
-	PARA_INFO_LOG("%s\n", "computing statistics of admissible files");
+	aa.m = current_mood;
+	PARA_NOTICE_LOG("computing statistics of admissible files\n");
 	ret = audio_file_loop(&aa, add_if_admissible);
 	if (ret < 0)
 		return ret;
 	log_statistics();
-	PARA_NOTICE_LOG("%d admissible files \n", statistics.num);
+	PARA_INFO_LOG("%d admissible files \n", statistics.num);
 	for (i = 0; i < statistics.num; i++) {
 		struct admissible_file_info *a = aa.array + i;
 		ret = add_to_score_table(a->aft_row, a->score);
 		if (ret < 0)
 			goto out;
 	}
-	PARA_NOTICE_LOG("score add complete\n");
-	ret = 1;
+	PARA_NOTICE_LOG("loaded mood %s\n", current_mood->name);
+	ret = statistics.num;
 out:
 	free(aa.array);
 	return ret;
 }
-
-/**
- * Close the current mood.
- *
- * Free all resources of the current mood which were allocated during
- * mood_open().
- */
-void mood_close(void)
-{
-	destroy_mood(current_mood);
-	current_mood = NULL;
-	memset(&statistics, 0, sizeof(statistics));
-}
-
 /**
  * Close and re-open the current mood.
  *
@@ -963,17 +1141,55 @@ void mood_close(void)
  *
  * \sa mood_open(), mood_close().
  */
-int mood_reload(void)
+int reload_current_mood(void)
 {
 	int ret;
-	char *mood_name;
+	char *mood_name = NULL;
 
 	if (!current_mood)
 		return 1;
-	score_shutdown(0);
-	mood_name = para_strdup(current_mood->name);
-	mood_close();
-	ret = mood_open(mood_name);
+	PARA_NOTICE_LOG("reloading %s\n", current_mood->name?
+		current_mood->name : "(dummy)");
+	if (current_mood->name)
+		mood_name = para_strdup(current_mood->name);
+	close_current_mood();
+	ret = change_current_mood(mood_name);
 	free(mood_name);
 	return ret;
 }
+
+int moods_event_handler(enum afs_events event, __a_unused struct para_buffer *pb,
+		void *data)
+{
+	switch(event) {
+	/*
+	 * The three blob events might change the set of admissible files,
+	 * so we must reload the score list.
+	 */
+	case BLOB_RENAME:
+	case BLOB_REMOVE:
+	case BLOB_ADD:
+		if (data == moods_table || data == playlists_table)
+			return 1; /* no reload necessary for these */
+		return reload_current_mood();
+	/* these also require reload of the score table */
+	case ATTRIBUTE_ADD:
+	case ATTRIBUTE_REMOVE:
+	case ATTRIBUTE_RENAME:
+		return reload_current_mood();
+	/* changes to the aft only require to re-examine the audio file */
+	case AFSI_CHANGE: {
+		struct afsi_change_event_data *aced = data;
+		return mood_update_audio_file(aced->aft_row, aced->old_afsi);
+		}
+	case AFHI_CHANGE:
+	case AUDIO_FILE_RENAME:
+	case AUDIO_FILE_ADD:
+		return mood_update_audio_file(data, NULL);
+	case AUDIO_FILE_REMOVE:
+		return mood_delete_audio_file(data);
+	default:
+		return 1;
+	}
+}
+