First commit

.gitignore

@@ -0,0 +1 @@
+build/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "bliss"]
+	path = bliss
+	url = https://github.com/Polochon-street/bliss

CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 2.8)
+
+project(MPDBliss C)
+
+add_subdirectory(bliss)
+
+file (GLOB MPDBLISS_SRC "src/*.c")
+include_directories("include/" "bliss/include")
+
+add_executable (mpdbliss
+    ${MPDBLISS_SRC})
+
+target_link_libraries (mpdbliss
+    m
+    sqlite3
+    mpdclient
+    bliss)

bliss

@@ -0,0 +1 @@
+Subproject commit 75db3a83356615bcc5c00c269a5a0356b20fb676

include/cmdline.h

@@ -0,0 +1,191 @@
+/** @file cmdline.h
+ *  @brief The header file for the command line option parser
+ *  generated by GNU Gengetopt version 2.22.6
+ *  http://www.gnu.org/software/gengetopt.
+ *  DO NOT modify this file, since it can be overwritten
+ *  @author GNU Gengetopt by Lorenzo Bettini */
+
+#ifndef CMDLINE_H
+#define CMDLINE_H
+
+/* If we use autoconf.  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h> /* for FILE */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef CMDLINE_PARSER_PACKAGE
+/** @brief the program name (used for printing errors) */
+#define CMDLINE_PARSER_PACKAGE "MPDBliss"
+#endif
+
+#ifndef CMDLINE_PARSER_PACKAGE_NAME
+/** @brief the complete program name (used for help and version) */
+#define CMDLINE_PARSER_PACKAGE_NAME "MPDBliss"
+#endif
+
+#ifndef CMDLINE_PARSER_VERSION
+/** @brief the program version */
+#define CMDLINE_PARSER_VERSION "VERSION"
+#endif
+
+/** @brief Where the command line options are stored */
+struct gengetopt_args_info
+{
+  const char *help_help; /**< @brief Print help and exit help description.  */
+  const char *version_help; /**< @brief Print version and exit help description.  */
+  int rescan_flag;	/**< @brief Rescan the whole MPD database. (default=off).  */
+  const char *rescan_help; /**< @brief Rescan the whole MPD database. help description.  */
+  int update_flag;	/**< @brief Trigger an update. (default=off).  */
+  const char *update_help; /**< @brief Trigger an update. help description.  */
+  char * mpd_root_arg;	/**< @brief MPD library base path..  */
+  char * mpd_root_orig;	/**< @brief MPD library base path. original value given at command line.  */
+  const char *mpd_root_help; /**< @brief MPD library base path. help description.  */
+  char * host_arg;	/**< @brief MPD host. (default='localhost').  */
+  char * host_orig;	/**< @brief MPD host. original value given at command line.  */
+  const char *host_help; /**< @brief MPD host. help description.  */
+  int port_arg;	/**< @brief MPD port. (default='6600').  */
+  char * port_orig;	/**< @brief MPD port. original value given at command line.  */
+  const char *port_help; /**< @brief MPD port. help description.  */
+  
+  unsigned int help_given ;	/**< @brief Whether help was given.  */
+  unsigned int version_given ;	/**< @brief Whether version was given.  */
+  unsigned int rescan_given ;	/**< @brief Whether rescan was given.  */
+  unsigned int update_given ;	/**< @brief Whether update was given.  */
+  unsigned int mpd_root_given ;	/**< @brief Whether mpd_root was given.  */
+  unsigned int host_given ;	/**< @brief Whether host was given.  */
+  unsigned int port_given ;	/**< @brief Whether port was given.  */
+
+} ;
+
+/** @brief The additional parameters to pass to parser functions */
+struct cmdline_parser_params
+{
+  int override; /**< @brief whether to override possibly already present options (default 0) */
+  int initialize; /**< @brief whether to initialize the option structure gengetopt_args_info (default 1) */
+  int check_required; /**< @brief whether to check that all required options were provided (default 1) */
+  int check_ambiguity; /**< @brief whether to check for options already specified in the option structure gengetopt_args_info (default 0) */
+  int print_errors; /**< @brief whether getopt_long should print an error message for a bad option (default 1) */
+} ;
+
+/** @brief the purpose string of the program */
+extern const char *gengetopt_args_info_purpose;
+/** @brief the usage string of the program */
+extern const char *gengetopt_args_info_usage;
+/** @brief the description string of the program */
+extern const char *gengetopt_args_info_description;
+/** @brief all the lines making the help output */
+extern const char *gengetopt_args_info_help[];
+
+/**
+ * The command line parser
+ * @param argc the number of command line options
+ * @param argv the command line options
+ * @param args_info the structure where option information will be stored
+ * @return 0 if everything went fine, NON 0 if an error took place
+ */
+int cmdline_parser (int argc, char **argv,
+  struct gengetopt_args_info *args_info);
+
+/**
+ * The command line parser (version with additional parameters - deprecated)
+ * @param argc the number of command line options
+ * @param argv the command line options
+ * @param args_info the structure where option information will be stored
+ * @param override whether to override possibly already present options
+ * @param initialize whether to initialize the option structure my_args_info
+ * @param check_required whether to check that all required options were provided
+ * @return 0 if everything went fine, NON 0 if an error took place
+ * @deprecated use cmdline_parser_ext() instead
+ */
+int cmdline_parser2 (int argc, char **argv,
+  struct gengetopt_args_info *args_info,
+  int override, int initialize, int check_required);
+
+/**
+ * The command line parser (version with additional parameters)
+ * @param argc the number of command line options
+ * @param argv the command line options
+ * @param args_info the structure where option information will be stored
+ * @param params additional parameters for the parser
+ * @return 0 if everything went fine, NON 0 if an error took place
+ */
+int cmdline_parser_ext (int argc, char **argv,
+  struct gengetopt_args_info *args_info,
+  struct cmdline_parser_params *params);
+
+/**
+ * Save the contents of the option struct into an already open FILE stream.
+ * @param outfile the stream where to dump options
+ * @param args_info the option struct to dump
+ * @return 0 if everything went fine, NON 0 if an error took place
+ */
+int cmdline_parser_dump(FILE *outfile,
+  struct gengetopt_args_info *args_info);
+
+/**
+ * Save the contents of the option struct into a (text) file.
+ * This file can be read by the config file parser (if generated by gengetopt)
+ * @param filename the file where to save
+ * @param args_info the option struct to save
+ * @return 0 if everything went fine, NON 0 if an error took place
+ */
+int cmdline_parser_file_save(const char *filename,
+  struct gengetopt_args_info *args_info);
+
+/**
+ * Print the help
+ */
+void cmdline_parser_print_help(void);
+/**
+ * Print the version
+ */
+void cmdline_parser_print_version(void);
+
+/**
+ * Initializes all the fields a cmdline_parser_params structure 
+ * to their default values
+ * @param params the structure to initialize
+ */
+void cmdline_parser_params_init(struct cmdline_parser_params *params);
+
+/**
+ * Allocates dynamically a cmdline_parser_params structure and initializes
+ * all its fields to their default values
+ * @return the created and initialized cmdline_parser_params structure
+ */
+struct cmdline_parser_params *cmdline_parser_params_create(void);
+
+/**
+ * Initializes the passed gengetopt_args_info structure's fields
+ * (also set default values for options that have a default)
+ * @param args_info the structure to initialize
+ */
+void cmdline_parser_init (struct gengetopt_args_info *args_info);
+/**
+ * Deallocates the string fields of the gengetopt_args_info structure
+ * (but does not deallocate the structure itself)
+ * @param args_info the structure to deallocate
+ */
+void cmdline_parser_free (struct gengetopt_args_info *args_info);
+
+/**
+ * Checks that all the required options were specified
+ * @param args_info the structure to check
+ * @param prog_name the name of the program that will be used to print
+ *   possible errors
+ * @return
+ */
+int cmdline_parser_required (struct gengetopt_args_info *args_info,
+  const char *prog_name);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* CMDLINE_H */

src/args.ggo

@@ -0,0 +1,9 @@
+package "MPDBliss"
+version "VERSION"
+purpose "Binding MPD and Bliss."
+
+option "rescan" r "Rescan the whole MPD database." flag off
+option "update" u "Trigger an update." flag off
+option "mpd_root" - "MPD library base path." string
+option "host" - "MPD host." string default="localhost" optional
+option "port" - "MPD port." int default="6600" optional

src/cmdline.c

@@ -0,0 +1,641 @@
+/*
+  File autogenerated by gengetopt version 2.22.6
+  generated with the following command:
+  gengetopt 
+
+  The developers of gengetopt consider the fixed text that goes in all
+  gengetopt output files to be in the public domain:
+  we make no copyright claims on it.
+*/
+
+/* If we use autoconf.  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef FIX_UNUSED
+#define FIX_UNUSED(X) (void) (X) /* avoid warnings for unused params */
+#endif
+
+#include <getopt.h>
+
+#include "cmdline.h"
+
+const char *gengetopt_args_info_purpose = "Binding MPD and Bliss.";
+
+const char *gengetopt_args_info_usage = "Usage: MPDBliss [OPTIONS]...";
+
+const char *gengetopt_args_info_versiontext = "";
+
+const char *gengetopt_args_info_description = "";
+
+const char *gengetopt_args_info_help[] = {
+  "  -h, --help             Print help and exit",
+  "  -V, --version          Print version and exit",
+  "  -r, --rescan           Rescan the whole MPD database.  (default=off)",
+  "  -u, --update           Trigger an update.  (default=off)",
+  "      --mpd_root=STRING  MPD library base path.",
+  "      --host=STRING      MPD host.  (default=`localhost')",
+  "      --port=INT         MPD port.  (default=`6600')",
+    0
+};
+
+typedef enum {ARG_NO
+  , ARG_FLAG
+  , ARG_STRING
+  , ARG_INT
+} cmdline_parser_arg_type;
+
+static
+void clear_given (struct gengetopt_args_info *args_info);
+static
+void clear_args (struct gengetopt_args_info *args_info);
+
+static int
+cmdline_parser_internal (int argc, char **argv, struct gengetopt_args_info *args_info,
+                        struct cmdline_parser_params *params, const char *additional_error);
+
+static int
+cmdline_parser_required2 (struct gengetopt_args_info *args_info, const char *prog_name, const char *additional_error);
+
+static char *
+gengetopt_strdup (const char *s);
+
+static
+void clear_given (struct gengetopt_args_info *args_info)
+{
+  args_info->help_given = 0 ;
+  args_info->version_given = 0 ;
+  args_info->rescan_given = 0 ;
+  args_info->update_given = 0 ;
+  args_info->mpd_root_given = 0 ;
+  args_info->host_given = 0 ;
+  args_info->port_given = 0 ;
+}
+
+static
+void clear_args (struct gengetopt_args_info *args_info)
+{
+  FIX_UNUSED (args_info);
+  args_info->rescan_flag = 0;
+  args_info->update_flag = 0;
+  args_info->mpd_root_arg = NULL;
+  args_info->mpd_root_orig = NULL;
+  args_info->host_arg = gengetopt_strdup ("localhost");
+  args_info->host_orig = NULL;
+  args_info->port_arg = 6600;
+  args_info->port_orig = NULL;
+  
+}
+
+static
+void init_args_info(struct gengetopt_args_info *args_info)
+{
+
+
+  args_info->help_help = gengetopt_args_info_help[0] ;
+  args_info->version_help = gengetopt_args_info_help[1] ;
+  args_info->rescan_help = gengetopt_args_info_help[2] ;
+  args_info->update_help = gengetopt_args_info_help[3] ;
+  args_info->mpd_root_help = gengetopt_args_info_help[4] ;
+  args_info->host_help = gengetopt_args_info_help[5] ;
+  args_info->port_help = gengetopt_args_info_help[6] ;
+  
+}
+
+void
+cmdline_parser_print_version (void)
+{
+  printf ("%s %s\n",
+     (strlen(CMDLINE_PARSER_PACKAGE_NAME) ? CMDLINE_PARSER_PACKAGE_NAME : CMDLINE_PARSER_PACKAGE),
+     CMDLINE_PARSER_VERSION);
+
+  if (strlen(gengetopt_args_info_versiontext) > 0)
+    printf("\n%s\n", gengetopt_args_info_versiontext);
+}
+
+static void print_help_common(void) {
+  cmdline_parser_print_version ();
+
+  if (strlen(gengetopt_args_info_purpose) > 0)
+    printf("\n%s\n", gengetopt_args_info_purpose);
+
+  if (strlen(gengetopt_args_info_usage) > 0)
+    printf("\n%s\n", gengetopt_args_info_usage);
+
+  printf("\n");
+
+  if (strlen(gengetopt_args_info_description) > 0)
+    printf("%s\n\n", gengetopt_args_info_description);
+}
+
+void
+cmdline_parser_print_help (void)
+{
+  int i = 0;
+  print_help_common();
+  while (gengetopt_args_info_help[i])
+    printf("%s\n", gengetopt_args_info_help[i++]);
+}
+
+void
+cmdline_parser_init (struct gengetopt_args_info *args_info)
+{
+  clear_given (args_info);
+  clear_args (args_info);
+  init_args_info (args_info);
+}
+
+void
+cmdline_parser_params_init(struct cmdline_parser_params *params)
+{
+  if (params)
+    { 
+      params->override = 0;
+      params->initialize = 1;
+      params->check_required = 1;
+      params->check_ambiguity = 0;
+      params->print_errors = 1;
+    }
+}
+
+struct cmdline_parser_params *
+cmdline_parser_params_create(void)
+{
+  struct cmdline_parser_params *params = 
+    (struct cmdline_parser_params *)malloc(sizeof(struct cmdline_parser_params));
+  cmdline_parser_params_init(params);  
+  return params;
+}
+
+static void
+free_string_field (char **s)
+{
+  if (*s)
+    {
+      free (*s);
+      *s = 0;
+    }
+}
+
+
+static void
+cmdline_parser_release (struct gengetopt_args_info *args_info)
+{
+
+  free_string_field (&(args_info->mpd_root_arg));
+  free_string_field (&(args_info->mpd_root_orig));
+  free_string_field (&(args_info->host_arg));
+  free_string_field (&(args_info->host_orig));
+  free_string_field (&(args_info->port_orig));
+  
+  
+
+  clear_given (args_info);
+}
+
+
+static void
+write_into_file(FILE *outfile, const char *opt, const char *arg, const char *values[])
+{
+  FIX_UNUSED (values);
+  if (arg) {
+    fprintf(outfile, "%s=\"%s\"\n", opt, arg);
+  } else {
+    fprintf(outfile, "%s\n", opt);
+  }
+}
+
+
+int
+cmdline_parser_dump(FILE *outfile, struct gengetopt_args_info *args_info)
+{
+  int i = 0;
+
+  if (!outfile)
+    {
+      fprintf (stderr, "%s: cannot dump options to stream\n", CMDLINE_PARSER_PACKAGE);
+      return EXIT_FAILURE;
+    }
+
+  if (args_info->help_given)
+    write_into_file(outfile, "help", 0, 0 );
+  if (args_info->version_given)
+    write_into_file(outfile, "version", 0, 0 );
+  if (args_info->rescan_given)
+    write_into_file(outfile, "rescan", 0, 0 );
+  if (args_info->update_given)
+    write_into_file(outfile, "update", 0, 0 );
+  if (args_info->mpd_root_given)
+    write_into_file(outfile, "mpd_root", args_info->mpd_root_orig, 0);
+  if (args_info->host_given)
+    write_into_file(outfile, "host", args_info->host_orig, 0);
+  if (args_info->port_given)
+    write_into_file(outfile, "port", args_info->port_orig, 0);
+  
+
+  i = EXIT_SUCCESS;
+  return i;
+}
+
+int
+cmdline_parser_file_save(const char *filename, struct gengetopt_args_info *args_info)
+{
+  FILE *outfile;
+  int i = 0;
+
+  outfile = fopen(filename, "w");
+
+  if (!outfile)
+    {
+      fprintf (stderr, "%s: cannot open file for writing: %s\n", CMDLINE_PARSER_PACKAGE, filename);
+      return EXIT_FAILURE;
+    }
+
+  i = cmdline_parser_dump(outfile, args_info);
+  fclose (outfile);
+
+  return i;
+}
+
+void
+cmdline_parser_free (struct gengetopt_args_info *args_info)
+{
+  cmdline_parser_release (args_info);
+}
+
+/** @brief replacement of strdup, which is not standard */
+char *
+gengetopt_strdup (const char *s)
+{
+  char *result = 0;
+  if (!s)
+    return result;
+
+  result = (char*)malloc(strlen(s) + 1);
+  if (result == (char*)0)
+    return (char*)0;
+  strcpy(result, s);
+  return result;
+}
+
+int
+cmdline_parser (int argc, char **argv, struct gengetopt_args_info *args_info)
+{
+  return cmdline_parser2 (argc, argv, args_info, 0, 1, 1);
+}
+
+int
+cmdline_parser_ext (int argc, char **argv, struct gengetopt_args_info *args_info,
+                   struct cmdline_parser_params *params)
+{
+  int result;
+  result = cmdline_parser_internal (argc, argv, args_info, params, 0);
+
+  if (result == EXIT_FAILURE)
+    {
+      cmdline_parser_free (args_info);
+      exit (EXIT_FAILURE);
+    }
+  
+  return result;
+}
+
+int
+cmdline_parser2 (int argc, char **argv, struct gengetopt_args_info *args_info, int override, int initialize, int check_required)
+{
+  int result;
+  struct cmdline_parser_params params;
+  
+  params.override = override;
+  params.initialize = initialize;
+  params.check_required = check_required;
+  params.check_ambiguity = 0;
+  params.print_errors = 1;
+
+  result = cmdline_parser_internal (argc, argv, args_info, &params, 0);
+
+  if (result == EXIT_FAILURE)
+    {
+      cmdline_parser_free (args_info);
+      exit (EXIT_FAILURE);
+    }
+  
+  return result;
+}
+
+int
+cmdline_parser_required (struct gengetopt_args_info *args_info, const char *prog_name)
+{
+  int result = EXIT_SUCCESS;
+
+  if (cmdline_parser_required2(args_info, prog_name, 0) > 0)
+    result = EXIT_FAILURE;
+
+  if (result == EXIT_FAILURE)
+    {
+      cmdline_parser_free (args_info);
+      exit (EXIT_FAILURE);
+    }
+  
+  return result;
+}
+
+int
+cmdline_parser_required2 (struct gengetopt_args_info *args_info, const char *prog_name, const char *additional_error)
+{
+  int error_occurred = 0;
+  FIX_UNUSED (additional_error);
+
+  /* checks for required options */
+  if (! args_info->mpd_root_given)
+    {
+      fprintf (stderr, "%s: '--mpd_root' option required%s\n", prog_name, (additional_error ? additional_error : ""));
+      error_occurred = 1;
+    }
+  
+  
+  /* checks for dependences among options */
+
+  return error_occurred;
+}
+
+
+static char *package_name = 0;
+
+/**
+ * @brief updates an option
+ * @param field the generic pointer to the field to update
+ * @param orig_field the pointer to the orig field
+ * @param field_given the pointer to the number of occurrence of this option
+ * @param prev_given the pointer to the number of occurrence already seen
+ * @param value the argument for this option (if null no arg was specified)
+ * @param possible_values the possible values for this option (if specified)
+ * @param default_value the default value (in case the option only accepts fixed values)
+ * @param arg_type the type of this option
+ * @param check_ambiguity @see cmdline_parser_params.check_ambiguity
+ * @param override @see cmdline_parser_params.override
+ * @param no_free whether to free a possible previous value
+ * @param multiple_option whether this is a multiple option
+ * @param long_opt the corresponding long option
+ * @param short_opt the corresponding short option (or '-' if none)
+ * @param additional_error possible further error specification
+ */
+static
+int update_arg(void *field, char **orig_field,
+               unsigned int *field_given, unsigned int *prev_given, 
+               char *value, const char *possible_values[],
+               const char *default_value,
+               cmdline_parser_arg_type arg_type,
+               int check_ambiguity, int override,
+               int no_free, int multiple_option,
+               const char *long_opt, char short_opt,
+               const char *additional_error)
+{
+  char *stop_char = 0;
+  const char *val = value;
+  int found;
+  char **string_field;
+  FIX_UNUSED (field);
+
+  stop_char = 0;
+  found = 0;
+
+  if (!multiple_option && prev_given && (*prev_given || (check_ambiguity && *field_given)))
+    {
+      if (short_opt != '-')
+        fprintf (stderr, "%s: `--%s' (`-%c') option given more than once%s\n", 
+               package_name, long_opt, short_opt,
+               (additional_error ? additional_error : ""));
+      else
+        fprintf (stderr, "%s: `--%s' option given more than once%s\n", 
+               package_name, long_opt,
+               (additional_error ? additional_error : ""));
+      return 1; /* failure */
+    }
+
+  FIX_UNUSED (default_value);
+    
+  if (field_given && *field_given && ! override)
+    return 0;
+  if (prev_given)
+    (*prev_given)++;
+  if (field_given)
+    (*field_given)++;
+  if (possible_values)
+    val = possible_values[found];
+
+  switch(arg_type) {
+  case ARG_FLAG:
+    *((int *)field) = !*((int *)field);
+    break;
+  case ARG_INT:
+    if (val) *((int *)field) = strtol (val, &stop_char, 0);
+    break;
+  case ARG_STRING:
+    if (val) {
+      string_field = (char **)field;
+      if (!no_free && *string_field)
+        free (*string_field); /* free previous string */
+      *string_field = gengetopt_strdup (val);
+    }
+    break;
+  default:
+    break;
+  };
+
+  /* check numeric conversion */
+  switch(arg_type) {
+  case ARG_INT:
+    if (val && !(stop_char && *stop_char == '\0')) {
+      fprintf(stderr, "%s: invalid numeric value: %s\n", package_name, val);
+      return 1; /* failure */
+    }
+    break;
+  default:
+    ;
+  };
+
+  /* store the original value */
+  switch(arg_type) {
+  case ARG_NO:
+  case ARG_FLAG:
+    break;
+  default:
+    if (value && orig_field) {
+      if (no_free) {
+        *orig_field = value;
+      } else {
+        if (*orig_field)
+          free (*orig_field); /* free previous string */
+        *orig_field = gengetopt_strdup (value);
+      }
+    }
+  };
+
+  return 0; /* OK */
+}
+
+
+int
+cmdline_parser_internal (
+  int argc, char **argv, struct gengetopt_args_info *args_info,
+                        struct cmdline_parser_params *params, const char *additional_error)
+{
+  int c;	/* Character of the parsed option.  */
+
+  int error_occurred = 0;
+  struct gengetopt_args_info local_args_info;
+  
+  int override;
+  int initialize;
+  int check_required;
+  int check_ambiguity;
+  
+  package_name = argv[0];
+  
+  override = params->override;
+  initialize = params->initialize;
+  check_required = params->check_required;
+  check_ambiguity = params->check_ambiguity;
+
+  if (initialize)
+    cmdline_parser_init (args_info);
+
+  cmdline_parser_init (&local_args_info);
+
+  optarg = 0;
+  optind = 0;
+  opterr = params->print_errors;
+  optopt = '?';
+
+  while (1)
+    {
+      int option_index = 0;
+
+      static struct option long_options[] = {
+        { "help",	0, NULL, 'h' },
+        { "version",	0, NULL, 'V' },
+        { "rescan",	0, NULL, 'r' },
+        { "update",	0, NULL, 'u' },
+        { "mpd_root",	1, NULL, 0 },
+        { "host",	1, NULL, 0 },
+        { "port",	1, NULL, 0 },
+        { 0,  0, 0, 0 }
+      };
+
+      c = getopt_long (argc, argv, "hVru", long_options, &option_index);
+
+      if (c == -1) break;	/* Exit from `while (1)' loop.  */
+
+      switch (c)
+        {
+        case 'h':	/* Print help and exit.  */
+          cmdline_parser_print_help ();
+          cmdline_parser_free (&local_args_info);
+          exit (EXIT_SUCCESS);
+
+        case 'V':	/* Print version and exit.  */
+          cmdline_parser_print_version ();
+          cmdline_parser_free (&local_args_info);
+          exit (EXIT_SUCCESS);
+
+        case 'r':	/* Rescan the whole MPD database..  */
+        
+        
+          if (update_arg((void *)&(args_info->rescan_flag), 0, &(args_info->rescan_given),
+              &(local_args_info.rescan_given), optarg, 0, 0, ARG_FLAG,
+              check_ambiguity, override, 1, 0, "rescan", 'r',
+              additional_error))
+            goto failure;
+        
+          break;
+        case 'u':	/* Trigger an update..  */
+        
+        
+          if (update_arg((void *)&(args_info->update_flag), 0, &(args_info->update_given),
+              &(local_args_info.update_given), optarg, 0, 0, ARG_FLAG,
+              check_ambiguity, override, 1, 0, "update", 'u',
+              additional_error))
+            goto failure;
+        
+          break;
+
+        case 0:	/* Long option with no short option */
+          /* MPD library base path..  */
+          if (strcmp (long_options[option_index].name, "mpd_root") == 0)
+          {
+          
+          
+            if (update_arg( (void *)&(args_info->mpd_root_arg), 
+                 &(args_info->mpd_root_orig), &(args_info->mpd_root_given),
+                &(local_args_info.mpd_root_given), optarg, 0, 0, ARG_STRING,
+                check_ambiguity, override, 0, 0,
+                "mpd_root", '-',
+                additional_error))
+              goto failure;
+          
+          }
+          /* MPD host..  */
+          else if (strcmp (long_options[option_index].name, "host") == 0)
+          {
+          
+          
+            if (update_arg( (void *)&(args_info->host_arg), 
+                 &(args_info->host_orig), &(args_info->host_given),
+                &(local_args_info.host_given), optarg, 0, "localhost", ARG_STRING,
+                check_ambiguity, override, 0, 0,
+                "host", '-',
+                additional_error))
+              goto failure;
+          
+          }
+          /* MPD port..  */
+          else if (strcmp (long_options[option_index].name, "port") == 0)
+          {
+          
+          
+            if (update_arg( (void *)&(args_info->port_arg), 
+                 &(args_info->port_orig), &(args_info->port_given),
+                &(local_args_info.port_given), optarg, 0, "6600", ARG_INT,
+                check_ambiguity, override, 0, 0,
+                "port", '-',
+                additional_error))
+              goto failure;
+          
+          }
+          
+          break;
+        case '?':	/* Invalid option.  */
+          /* `getopt_long' already printed an error message.  */
+          goto failure;
+
+        default:	/* bug: option not considered.  */
+          fprintf (stderr, "%s: option unknown: %c%s\n", CMDLINE_PARSER_PACKAGE, c, (additional_error ? additional_error : ""));
+          abort ();
+        } /* switch */
+    } /* while */
+
+
+
+  if (check_required)
+    {
+      error_occurred += cmdline_parser_required2 (args_info, argv[0], additional_error);
+    }
+
+  cmdline_parser_release (&local_args_info);
+
+  if ( error_occurred )
+    return (EXIT_FAILURE);
+
+  return 0;
+
+failure:
+  
+  cmdline_parser_release (&local_args_info);
+  return (EXIT_FAILURE);
+}

src/main.c

@@ -0,0 +1,342 @@
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#include <mpd/client.h>
+#include <sqlite3.h>
+
+#include "bliss.h"
+#include "cmdline.h"
+
+// TODO: Handle deletions from db
+
+#define DEFAULT_STRING_LENGTH 255
+
+// Data file path to store latest seen mtimes and db
+char mpdbliss_data_file[DEFAULT_STRING_LENGTH] = "";
+char mpdbliss_data_db[DEFAULT_STRING_LENGTH] = "";
+// IDLE loop control variable
+volatile bool mpd_run_idle_loop = true;
+// MPD connection handler
+struct mpd_connection *conn;
+
+
+/**
+ * Handle interruption when waiting for MPD IDLE items.
+ */
+void sigint_catch_function(int signo)
+{
+    // TODO: Not working
+    // TODO: Should store latest seen mtime there
+    printf("Exiting...\n");
+
+    // Stop listening for MPD IDLE
+    mpd_run_noidle(conn);
+
+    // Stop main loop
+    mpd_run_idle_loop = false;
+}
+
+
+/**
+ * Strip the trailing slash from a string.
+ *
+ * @param[in] str   String to strip slash from.
+ * @param[out] str   Stripped string.
+ */
+void strip_trailing_slash(char* str)
+{
+    size_t length = strlen(str);
+    if ('/' == str[length - 1]) {
+        str[length - 1] = '\0';
+    }
+}
+
+
+/**
+ * Update the database.
+ *
+ * @param mpd_connection    MPD connection object to use.
+ * @param initial_mtime     Initial mtime to use.
+ * @param mpd_base_path     Root directory of the MPD library.
+ */
+void update_database(
+        struct mpd_connection *conn,
+        time_t initial_mtime,
+        char *mpd_base_path
+    )
+{
+    // Store latest mtime seen
+    time_t latest_mtime = initial_mtime;
+
+    // Get the list of all the files to process
+    if (!mpd_send_list_all_meta(conn, NULL)) {
+        fprintf(stderr, "Unable to get a full list of items in the db.\n");
+        return;
+    }
+
+    // Connect to SQLite db
+    sqlite3 *dbh;
+    if (0 != sqlite3_open(mpdbliss_data_db, &dbh)) {
+        fprintf(stderr, "Unable to open SQLite db.\n");
+        return;
+    }
+
+    // Process the received list
+    struct mpd_entity *entity;
+    while ((entity = mpd_recv_entity(conn)) != NULL) {
+        const struct mpd_song *song;
+
+        switch (mpd_entity_get_type(entity)) {
+            case MPD_ENTITY_TYPE_SONG:
+                song = mpd_entity_get_song(entity);
+                break;
+
+            case MPD_ENTITY_TYPE_UNKNOWN:
+            case MPD_ENTITY_TYPE_DIRECTORY:
+            case MPD_ENTITY_TYPE_PLAYLIST:
+                // Pass such types
+                continue;
+        }
+
+        // Pass song if already seen
+        time_t song_mtime = mpd_song_get_last_modified(song);
+        if (difftime(song_mtime, initial_mtime) <= 0) {
+            continue;
+        }
+
+        // Compute bl_analyze and store it
+        const char *song_uri = mpd_song_get_uri(song);
+        printf("\nAdding new song to db: %s\n", song_uri);
+        struct bl_song song_analysis;
+        char song_full_uri[DEFAULT_STRING_LENGTH] = "";
+        strncat(song_full_uri, mpd_base_path, DEFAULT_STRING_LENGTH);
+        strncat(song_full_uri, song_uri, DEFAULT_STRING_LENGTH);
+        if (BL_UNEXPECTED == bl_analyze(song_full_uri, &song_analysis)) {
+            fprintf(stderr, "Error while parsing song: %s.\n\n", song_uri);
+            continue;
+        }
+        // Insert into db
+        sqlite3_stmt *res;
+        // Begin transaction
+        int dberr = sqlite3_exec(dbh, "BEGIN TRANSACTION", NULL, NULL, NULL);
+        if (SQLITE_OK != dberr) {
+            fprintf(stderr, "Error while inserting data in db: %s\n\n", sqlite3_errmsg(dbh));
+            sqlite3_exec(dbh, "ROLLBACK", NULL, NULL, NULL);
+            continue;
+        }
+        // Insert song analysis in database
+        dberr = sqlite3_prepare_v2(dbh,
+                "INSERT INTO songs(tempo, amplitude, frequency, attack, filename) VALUES(?, ?, ?, ?, ?)",
+                -1, &res, 0);
+        if (SQLITE_OK != dberr) {
+            fprintf(stderr, "Error while inserting data in db: %s\n\n", sqlite3_errmsg(dbh));
+            sqlite3_exec(dbh, "ROLLBACK", NULL, NULL, NULL);
+            continue;
+        }
+        sqlite3_bind_double(res, 1, song_analysis.force_vector.tempo);
+        sqlite3_bind_double(res, 2, song_analysis.force_vector.amplitude);
+        sqlite3_bind_double(res, 3, song_analysis.force_vector.frequency);
+        sqlite3_bind_double(res, 4, song_analysis.force_vector.attack);
+        sqlite3_bind_text(res, 5, song_uri, strlen(song_uri), SQLITE_STATIC);
+        sqlite3_step(res);
+        sqlite3_finalize(res);
+        int last_id = sqlite3_last_insert_rowid(dbh);
+        // Insert updated distances
+        dberr = sqlite3_prepare_v2(dbh, "SELECT id, tempo, amplitude, frequency, attack FROM songs", -1, &res, 0);
+        if (SQLITE_OK != dberr) {
+            fprintf(stderr, "Error while inserting data in db: %s\n\n", sqlite3_errmsg(dbh));
+            sqlite3_exec(dbh, "ROLLBACK", NULL, NULL, NULL);
+            continue;
+        }
+        int dberr2 = SQLITE_OK;
+        while (sqlite3_step(res) == SQLITE_ROW) {
+            int id = sqlite3_column_int(res, 0);
+            if (id == last_id) {
+                // Skip last inserted item
+                continue;
+            }
+            struct force_vector_s song_db;
+            song_db.tempo = sqlite3_column_double(res, 1);
+            song_db.amplitude = sqlite3_column_double(res, 2);
+            song_db.frequency = sqlite3_column_double(res, 3);
+            song_db.attack = sqlite3_column_double(res, 4);
+            float distance = bl_distance(song_analysis.force_vector, song_db);
+
+            sqlite3_stmt *res2;
+            dberr2 = sqlite3_prepare_v2(dbh,
+                    "INSERT INTO distances(song1, song2, distance) VALUES(?, ?, ?)",
+                    -1, &res2, 0);
+            if (SQLITE_OK != dberr2) {
+                fprintf(stderr, "Error while inserting data in db: %s\n\n", sqlite3_errmsg(dbh));
+                break;
+            }
+            printf("%d %d %f\n", last_id, id, distance);
+            sqlite3_bind_int(res2, 1, last_id);
+            sqlite3_bind_int(res2, 2, id);
+            sqlite3_bind_double(res2, 3, distance);
+            sqlite3_step(res2);
+            sqlite3_finalize(res2);
+        }
+        if (SQLITE_OK != dberr2) {
+            sqlite3_exec(dbh, "ROLLBACK", NULL, NULL, NULL);
+            continue;
+        }
+        sqlite3_finalize(res);
+        // Commit transaction
+        dberr = sqlite3_exec(dbh, "COMMIT", NULL, NULL, NULL);
+        if (SQLITE_OK != dberr) {
+            fprintf(stderr, "Error while inserting data in db: %s\n\n", sqlite3_errmsg(dbh));
+            sqlite3_exec(dbh, "ROLLBACK", NULL, NULL, NULL);
+            continue;
+        }
+
+        // Update latest mtime
+        if (difftime(song_mtime, latest_mtime) >= 0) {
+            latest_mtime = song_mtime;
+        }
+
+        // Free the allocated entity
+        mpd_entity_free(entity);
+        printf("\n");
+    }
+
+    // Close SQLite connection
+    sqlite3_close(dbh);
+
+    // Update last_mtime
+    FILE *fp = fopen(mpdbliss_data_file, "w+");
+    if (NULL != fp) {
+        fprintf(fp, "%d\n", latest_mtime);
+        fclose(fp);
+    }
+    else {
+        fprintf(stderr, "Unable to store latest mtime seen.\n");
+        return;
+    }
+}
+
+
+int main(int argc, char** argv) {
+    struct gengetopt_args_info args_info;
+
+    // Scan arguments
+    if (0 != cmdline_parser(argc, argv, &args_info)) {
+        exit(EXIT_FAILURE) ;
+    }
+
+    // Create MPD connection
+    conn = mpd_connection_new(
+            args_info.host_arg,
+            args_info.port_arg,
+            30000);
+    if (mpd_connection_get_error(conn) != MPD_ERROR_SUCCESS) {
+        fprintf(stderr, "Unable to connect to the MPD server.\n");
+        exit(EXIT_FAILURE);
+    }
+
+    char *mpd_base_path = args_info.mpd_root_arg;
+
+    // Get data directory
+    char *xdg_data_home_env = getenv("XDG_DATA_HOME");
+    if (NULL == xdg_data_home_env) {
+        strncat(mpdbliss_data_file, getenv("HOME"), DEFAULT_STRING_LENGTH);
+        strip_trailing_slash(mpdbliss_data_file);
+        strncat(mpdbliss_data_file, "/.local/share/mpdbliss", DEFAULT_STRING_LENGTH);
+    }
+    else {
+        strncpy(mpdbliss_data_file, xdg_data_home_env, DEFAULT_STRING_LENGTH);
+        strip_trailing_slash(mpdbliss_data_file);
+        strncat(mpdbliss_data_file, "/mpdbliss", DEFAULT_STRING_LENGTH);
+    }
+
+    // Ensure data folder exists
+    mkdir(mpdbliss_data_file, 0700);
+
+    // Set data file path
+    strncat(mpdbliss_data_db, mpdbliss_data_file, DEFAULT_STRING_LENGTH);
+    strncat(mpdbliss_data_db, "/db.sqlite3", DEFAULT_STRING_LENGTH);
+    strncat(mpdbliss_data_file, "/latest_mtime.txt", DEFAULT_STRING_LENGTH);
+
+    // Get latest mtime
+    time_t last_mtime = 0;  // Set it to epoch by default
+    FILE *fp = fopen(mpdbliss_data_file, "r");
+    if (NULL != fp) {
+        // Read it from file if applicable
+        fscanf(fp, "%d\n", &last_mtime);
+        fclose(fp);
+    }
+
+    // Initialize database table
+    sqlite3 *dbh;
+    if (0 != sqlite3_open_v2(mpdbliss_data_db, &dbh, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL)) {
+        fprintf(stderr, "Unable to open SQLite db.\n");
+        return EXIT_FAILURE;
+    }
+    int dberr = sqlite3_exec(dbh, "PRAGMA foreign_keys = ON", NULL, NULL, NULL);
+    if (SQLITE_OK != dberr) {
+        fprintf(stderr, "Error creating db: %s.\n", sqlite3_errmsg(dbh));
+        sqlite3_close(dbh);
+        return EXIT_FAILURE;
+    }
+    dberr = sqlite3_exec(dbh, "CREATE TABLE IF NOT EXISTS songs( \
+        id INTEGER PRIMARY KEY, \
+        tempo REAL, \
+        amplitude REAL, \
+        frequency REAL, \
+        attack REAL, \
+        filename TEXT)",
+        NULL, NULL, NULL);
+    if (SQLITE_OK != dberr) {
+        fprintf(stderr, "Error creating db: %s.\n", sqlite3_errmsg(dbh));
+        sqlite3_close(dbh);
+        return EXIT_FAILURE;
+    }
+    dberr = sqlite3_exec(dbh, "CREATE TABLE IF NOT EXISTS distances( \
+        song1 INTEGER, \
+        song2 INTEGER, \
+        distance REAL, \
+        FOREIGN KEY(song1) REFERENCES songs(id) ON DELETE CASCADE, \
+        FOREIGN KEY(song2) REFERENCES songs(id) ON DELETE CASCADE)",
+        NULL, NULL, NULL);
+    if (SQLITE_OK != dberr) {
+        fprintf(stderr, "Error creating db: %s.\n", sqlite3_errmsg(dbh));
+        sqlite3_close(dbh);
+        return EXIT_FAILURE;
+    }
+    sqlite3_close(dbh);
+
+    // Check if a full rescan is needed
+    if (1 == args_info.rescan_flag) {
+        update_database(conn, last_mtime, mpd_base_path);
+    }
+    // Else, if we requested an update of the db
+    else if (true == args_info.update_flag) {
+        // Rescan from last known mtime
+        update_database(conn, last_mtime, mpd_base_path);
+    }
+    else {
+        // Setting signal handler
+        if (signal(SIGINT, sigint_catch_function) == SIG_ERR) {
+            fprintf(stderr, "An error occurred while setting a signal handler.\n");
+            return EXIT_FAILURE;
+        }
+
+        while (mpd_run_idle_loop) {
+            // Else, start an MPD IDLE connection
+            mpd_run_idle_mask(conn, MPD_IDLE_DATABASE);
+
+            // Rescan from last known mtime
+            update_database(conn, last_mtime, mpd_base_path);
+
+            // Stop listening to MPD IDLE
+            mpd_run_noidle(conn);
+        }
+    }
+
+    return EXIT_SUCCESS;
+}