mail: use mailvar_is_true to test boolean values

@@ -148,7 +148,7 @@ alias_expand (const char *name)
   mu_list_t al;
   mu_list_t list;
   
-  if (mailvar_get (NULL, "recursivealiases", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("recursivealiases"))
     {
       char *s;
       mu_list_t origlist;

@@ -281,14 +281,13 @@ display_submessage (struct mime_descend_closure *closure, void *data)
       
       /* If `metamail' is set to true, enable internal mailcap
 	 support */
-      if (mailvar_get (NULL, "metamail", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("metamail"))
 	{
 	  char *no_ask = NULL;
 	  int debug = 0;
 	  
 	  mailvar_get (&no_ask, "mimenoask", mailvar_type_string, 0);
-	  if (mailvar_get (&debug, "verbose", mailvar_type_boolean, 0) == 0
-	      && debug)
+	  if (mailvar_is_true ("verbose"))
 	    debug = 9;
 	  
 	  builtin_display = display_stream_mailcap (NULL, stream, hdr, no_ask,

@@ -38,7 +38,7 @@ mail_delete (int argc, char **argv)
   int rc = util_foreach_msg (argc, argv, MSG_NODELETED|MSG_SILENT,
 			     mail_delete_msg, NULL);
 
-  if (mailvar_get (NULL, "autoprint", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("autoprint"))
     util_do_command("print");
 
   return rc;

@@ -273,7 +273,7 @@ escape_run_editor (char *ed, int argc, char **argv, compose_env_t *env)
     }
 
   mu_stream_seek (env->compstr, 0, MU_SEEK_SET, NULL);
-  if (!mailvar_get (NULL, "editheaders", mailvar_type_boolean, 0))
+  if (mailvar_is_true ("editheaders"))
     {
       dump_headers (tempstream, env);
 

@@ -116,7 +116,7 @@ mail_file (int argc, char **argv)
       mbox = newbox;
       mu_mailbox_messages_count (mbox, &total);
       set_cursor (1);
-      if (mailvar_get (NULL, "header", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("header"))
 	{
 	  util_do_command ("summary");
 	  util_do_command ("headers");

@@ -193,7 +193,7 @@ hdr_date (struct header_call_args *args, void *data)
   mu_message_get_header (args->msg, &hdr);
   
   date[0] = 0;
-  if (mailvar_get (NULL, "datefield", mailvar_type_boolean, 0) == 0
+  if (mailvar_is_true ("datefield")
       && mu_header_get_value (hdr, MU_HEADER_DATE,
 			      date, sizeof (date), NULL) == 0)
     {
@@ -225,7 +225,7 @@ hdr_from (struct header_call_args *args, void *data)
 {
   char *from = NULL;
   
-  if (mailvar_get (NULL, "fromfield", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("fromfield"))
     {  
       mu_header_t hdr;
       
@@ -240,9 +240,7 @@ hdr_from (struct header_call_args *args, void *data)
 	  
 	      if (mu_address_sget_email (address, 1, &email) == 0)
 		{
-		  if (mailvar_get (NULL, "showto",
-				   mailvar_type_boolean, 0) == 0
-		      && mail_is_my_name (email))
+		  if (mailvar_is_true ("showto") && mail_is_my_name (email))
 		    {
 		      char *tmp;
 

@@ -318,8 +318,7 @@ mail_cmdline (void *closure, int cont MU_ARG_UNUSED)
 
   while (1)
     {
-      if (mailvar_get (NULL, "autoinc", mailvar_type_boolean, 0) == 0
-          && !mu_mailbox_is_updated (mbox))
+      if (mailvar_is_true ("autoinc") && !mu_mailbox_is_updated (mbox))
 	{
 	  mu_mailbox_messages_count (mbox, &total);
 	  page_invalidate (0);
@@ -334,7 +333,7 @@ mail_cmdline (void *closure, int cont MU_ARG_UNUSED)
 	  continue;
 	}
 
-      if (!rc && mailvar_get (NULL, "ignoreeof", mailvar_type_boolean, 0) == 0)
+      if (!rc && mailvar_is_true ("ignoreeof"))
 	{
 	  mu_error (_("Use \"quit\" to quit."));
 	  continue;
@@ -536,7 +535,7 @@ main (int argc, char **argv)
 
   
   /* read system-wide mail.rc and user's .mailrc */
-  if (mailvar_get (NULL, "rc", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("rc"))
     util_do_command ("source %s", SITE_MAIL_RC);
   if ((p = getenv ("MAILRC")) && *p)
     util_do_command ("source %s", getenv ("MAILRC"));
@@ -581,7 +580,7 @@ main (int argc, char **argv)
 
       mu_argcv_string (argc, argv, &buf);
       rc = util_do_command ("mail %s", buf);
-      return mailvar_get (NULL, "mailx", mailvar_type_boolean, 0) ? rc : 0;
+      return mailvar_is_true ("mailx") ? 0 : rc;
     }
   /* Or acting as a normal reader */
   else 
@@ -637,8 +636,7 @@ main (int argc, char **argv)
 	}
       
       if (total == 0
-	  && (strcmp (mode, "read")
-	      || mailvar_get (NULL, "emptystart", mailvar_type_boolean, 0)))
+	  && (strcmp (mode, "read") || !mailvar_is_true ("emptystart")))
         {
 	  if (file)
 	    mu_printf (_("%s: 0 messages\n"), file);
@@ -648,7 +646,7 @@ main (int argc, char **argv)
         }
 
       /* initial commands */
-      if (mailvar_get (NULL, "header", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("header"))
 	{
 	  util_do_command ("summary");
 	  util_do_command ("headers");

@@ -33,7 +33,7 @@ sig_handler (int signo)
   switch (signo)
     {
     case SIGINT:
-      if (mailvar_get (NULL, "quit", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("quit"))
 	exit (0);
       _interrupted++;
       break;

@@ -501,8 +501,7 @@ mailvar_set (const char *variable, void *value, enum mailvar_type type,
   enum mailvar_cmd cmd =
     (flags & MOPTF_UNSET) ? mailvar_cmd_unset : mailvar_cmd_set;
   
-  if (!(flags & MOPTF_QUIET)
-      && mailvar_get (NULL, "variable-strict", mailvar_type_boolean, 0) == 0)
+  if (!(flags & MOPTF_QUIET) && mailvar_is_true ("variable-strict"))
     {
       if (!sym)
 	mu_diag_output (MU_DIAG_WARNING, _("setting unknown variable %s"),
@@ -843,8 +842,7 @@ mailvar_print (int set)
   varlist = mailvar_list_copy (set);
   mu_list_count (varlist, &count);
   clos.out = open_pager (count);
-  clos.prettyprint = mailvar_get (NULL, "variable-pretty-print",
-				  mailvar_type_boolean, 0) == 0;
+  clos.prettyprint = mailvar_is_true ("variable-pretty-print");
   clos.width = util_screen_columns ();
 
   mu_list_foreach (varlist, mailvar_printer, &clos);

@@ -55,7 +55,7 @@ mail_pipe (int argc, char **argv)
 	  mu_message_get_streamref (msg, &stream);
 	  mu_stream_copy (outstr, stream, 0, NULL);
 	  mu_stream_destroy (&stream);
-	  if (mailvar_get (NULL, "page", mailvar_type_boolean, 0) == 0)
+	  if (mailvar_is_true ("page"))
 	    mu_stream_write (outstr, "\f\n", 2, NULL);
 	}
       util_mark_read (msg);

@@ -36,7 +36,7 @@ mail_print_msg (msgset_t *mspec, mu_message_t mesg, void *data)
   int status;
   
   mu_message_lines (mesg, &lines);
-  if (mailvar_get (NULL, "showenvelope", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("showenvelope"))
     lines++;
   
   /* If it is POP or IMAP the lines number is not known, so try
@@ -57,7 +57,7 @@ mail_print_msg (msgset_t *mspec, mu_message_t mesg, void *data)
 
   out = open_pager (lines);
 
-  if (mailvar_get (NULL, "showenvelope", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("showenvelope"))
     print_envelope (mspec, mesg, "From");
   
   if (*(int *) data) /* print was called with a lowercase 'p' */

@@ -39,7 +39,7 @@ mail_mbox_close ()
   if (!mbox)
     return 0;
 
-  if (mailvar_get (NULL, "readonly", mailvar_type_boolean, 0))
+  if (!mailvar_is_true ("readonly"))
     {
       if (mail_mbox_commit ())
 	return 1;
@@ -67,8 +67,8 @@ mail_mbox_commit ()
   int saved_count = 0;
   mu_message_t msg;
   mu_attribute_t attr;
-  int keepsave = mailvar_get (NULL, "keepsave", mailvar_type_boolean, 0) == 0;
-  int hold = mailvar_get (NULL, "hold", mailvar_type_boolean, 0) == 0;
+  int keepsave = mailvar_is_true ("keepsave");
+  int hold = mailvar_is_true ("hold");
   mu_url_t url;
   int is_user_mbox;
 

@@ -83,8 +83,7 @@ reply0 (msgset_t *mspec, mu_message_t msg, void *data)
 	  const char *email;
 	  if (mu_address_sget_email (addr, i, &email) || email == NULL)
 	    continue;
-	  if ((mailvar_get (NULL, "metoo", mailvar_type_boolean, 0) == 0)
-	      || !mail_is_my_name (email))
+	  if (mailvar_is_true ("metoo") || !mail_is_my_name (email))
 	    compose_header_set (&env, MU_HEADER_TO,
 				email,
 				COMPOSE_SINGLE_LINE);
@@ -121,9 +120,7 @@ reply0 (msgset_t *mspec, mu_message_t msg, void *data)
   
   make_in_reply_to (&env, msg);
   make_references (&env, msg);
-  status = mail_send0 (&env,
-		       mailvar_get (NULL, "byname", mailvar_type_boolean, 0)
-		                     == 0);
+  status = mail_send0 (&env, mailvar_is_true ("byname"));
   compose_destroy (&env);
 
   return status;
@@ -133,7 +130,7 @@ int
 mail_reply (int argc, char **argv)
 {
   int lower = mu_islower (argv[0][0]);
-  if (mailvar_get (NULL, "flipr", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("flipr"))
     lower = !lower;
   return util_foreach_msg (argc, argv, MSG_NODELETED, reply0, &lower);
 }

@@ -619,10 +619,10 @@ add_attachments (compose_env_t *env, mu_message_t *pmsg)
 static void
 read_cc_bcc (compose_env_t *env)
 {
-  if (mailvar_get (NULL, "askcc", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("askcc"))
     compose_header_set (env, MU_HEADER_CC,
 			ml_readline_with_intr ("Cc: "), COMPOSE_REPLACE);
-  if (mailvar_get (NULL, "askbcc", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("askbcc"))
     compose_header_set (env, MU_HEADER_BCC,
 			ml_readline_with_intr ("Bcc: "), COMPOSE_REPLACE);
 }
@@ -655,7 +655,7 @@ mail_send (int argc, char **argv)
       if (interactive)
 	compose_header_set (&env, MU_HEADER_TO, ml_readline_with_intr ("To: "),
 			    COMPOSE_REPLACE);
-      else if (!mailvar_get (NULL, "editheaders", mailvar_type_boolean, 0))
+      else if (mailvar_is_true ("editheaders"))
 	{
 	  if (parse_headers (mu_strin, &env) != parse_headers_ok)
 	    {
@@ -710,10 +710,10 @@ mail_send (int argc, char **argv)
 
   if (interactive)
     {
-      if (mailvar_get (NULL, "mailx", mailvar_type_boolean, 0))
+      if (!mailvar_is_true ("mailx"))
 	read_cc_bcc (&env);
 
-      if (mailvar_get (NULL, "asksub", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("asksub"))
 	compose_header_set (&env, MU_HEADER_SUBJECT,
 			    ml_readline_with_intr ("Subject: "),
 			    COMPOSE_REPLACE);
@@ -859,8 +859,7 @@ compose_header_set (compose_env_t *env, const char *name,
   switch (mode)
     {
     case COMPOSE_REPLACE:
-      if (is_address_field (name)
-	  && mailvar_get (NULL, "inplacealiases", mailvar_type_boolean, 0) == 0)
+      if (is_address_field (name) && mailvar_is_true ("inplacealiases"))
 	{
 	  char *exp = alias_expand (value);
 	  status = mu_header_set_value (env->header, name, exp ? exp : value, 1);
@@ -871,8 +870,7 @@ compose_header_set (compose_env_t *env, const char *name,
       break;
 
     case COMPOSE_APPEND:
-      if (is_address_field (name)
-	  && mailvar_get (NULL, "inplacealiases", mailvar_type_boolean, 0) == 0)
+      if (is_address_field (name) && mailvar_is_true ("inplacealiases"))
 	{
 	  char *exp = alias_expand (value);
 	  status = mu_header_append (env->header, name, exp ? exp : value);
@@ -886,8 +884,7 @@ compose_header_set (compose_env_t *env, const char *name,
       if (mu_header_aget_value (env->header, name, &old_value) == 0
 	  && old_value[0])
 	{
-	  if (is_address_field (name)
-	      && mailvar_get (NULL, "inplacealiases", mailvar_type_boolean, 0) == 0)
+	  if (is_address_field (name) && mailvar_is_true ("inplacealiases"))
 	    {
 	      char *exp = alias_expand (value);
 	      status = util_merge_addresses (&old_value, exp ? exp : value);
@@ -971,7 +968,7 @@ fill_body (mu_message_t msg, mu_stream_t instr)
   
   if (n == 0)
     {
-      if (mailvar_get (NULL, "nullbody", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("nullbody"))
 	{
 	  char *str;
 	  if (mailvar_get (&str, "nullbodymsg", mailvar_type_string, 0) == 0)
@@ -987,7 +984,7 @@ fill_body (mu_message_t msg, mu_stream_t instr)
 static int
 save_dead_message_env (compose_env_t *env)
 {
-  if (mailvar_get (NULL, "save", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("save"))
     {
       mu_stream_t dead_letter, str;
       int rc;
@@ -1005,8 +1002,7 @@ save_dead_message_env (compose_env_t *env)
 	  mu_error (_("Cannot open file %s: %s"), name, strerror (rc));
 	  return 1;
 	}
-      if (mailvar_get (NULL, "appenddeadletter",
-		       mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("appenddeadletter"))
 	mu_stream_seek (dead_letter, 0, MU_SEEK_END, NULL);
       else
 	mu_stream_truncate (dead_letter, 0);
@@ -1039,7 +1035,7 @@ save_dead_message_env (compose_env_t *env)
 static int
 save_dead_message (mu_message_t msg)
 {
-  if (mailvar_get (NULL, "save", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("save"))
     {
       mu_stream_t dead_letter, str;
       int rc;
@@ -1057,8 +1053,7 @@ save_dead_message (mu_message_t msg)
 	  mu_error (_("Cannot open file %s: %s"), name, strerror (rc));
 	  return 1;
 	}
-      if (mailvar_get (NULL, "appenddeadletter",
-		       mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("appenddeadletter"))
 	mu_stream_seek (dead_letter, 0, MU_SEEK_END, NULL);
       else
 	mu_stream_truncate (dead_letter, 0);
@@ -1117,7 +1112,7 @@ send_message (mu_message_t msg)
 		    }
 		} 
 
-	      if (mailvar_get (NULL, "verbose", mailvar_type_boolean, 0) == 0)
+	      if (mailvar_is_true ("verbose"))
 		{
 		  mu_debug_set_category_level (MU_DEBCAT_MAILER,
 					  MU_DEBUG_LEVEL_UPTO (MU_DEBUG_PROT));
@@ -1188,7 +1183,7 @@ mail_send0 (compose_env_t *env, int save_to)
 
       if (ml_got_interrupt ())
 	{
-	  if (mailvar_get (NULL, "ignore", mailvar_type_boolean, 0) == 0)
+	  if (mailvar_is_true ("ignore"))
 	    {
 	      mu_printf ("@\n");
 	    }
@@ -1205,12 +1200,11 @@ mail_send0 (compose_env_t *env, int save_to)
 
       if (!buf)
 	{
-	  if (interactive 
-	      && mailvar_get (NULL, "ignoreeof", mailvar_type_boolean, 0) == 0)
+	  if (interactive && mailvar_is_true ("ignoreeof"))
 	    {
-	      mu_error (mailvar_get (NULL, "dot", mailvar_type_boolean, 0) == 0 ?
-			  _("Use \".\" to terminate letter.") :
-			  _("Use \"~.\" to terminate letter."));
+	      mu_error (mailvar_is_true ("dot") 
+                          ?  _("Use \".\" to terminate letter.") 
+                          : _("Use \"~.\" to terminate letter."));
 	      continue;
 	    }
 	  else
@@ -1219,8 +1213,7 @@ mail_send0 (compose_env_t *env, int save_to)
 
       int_cnt = 0;
 
-      if (strcmp (buf, ".") == 0
-	  && mailvar_get (NULL, "dot", mailvar_type_boolean, 0) == 0)
+      if (strcmp (buf, ".") == 0 && mailvar_is_true ("dot"))
 	done = 1;
       else if (mailvar_get (&escape, "escape", mailvar_type_string, 0) == 0
 	       && buf[0] == escape[0])
@@ -1276,13 +1269,12 @@ mail_send0 (compose_env_t *env, int save_to)
 
   /* In mailx compatibility mode, ask for Cc and Bcc after editing
      the body of the message */
-  if (mailvar_get (NULL, "mailx", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("mailx"))
     read_cc_bcc (env);
 
   /* Prepare the header */
-  if (mailvar_get (NULL, "xmailer", mailvar_type_boolean, 0) == 0)
-    mu_header_set_value (env->header, MU_HEADER_X_MAILER, 
-                         program_version, 1);
+  if (mailvar_is_true ("xmailer"))
+    mu_header_set_value (env->header, MU_HEADER_X_MAILER, program_version, 1);
 
   if (util_header_expand (&env->header) == 0)
     {

@@ -78,7 +78,7 @@ mail_execute (int shell, char *progname, int argc, char **argv)
   xargv = mu_calloc (xargc + 1, sizeof (xargv[0]));
   
   /* Expand arguments if required */
-  if (mailvar_get (NULL, "bang", mailvar_type_boolean, 0) == 0)
+  if (mailvar_is_true ("bang"))
     {
       int i;
       char *last = NULL;

@@ -403,7 +403,7 @@ util_get_crt ()
 
   if (mailvar_get (&lines, "crt", mailvar_type_number, 0) == 0)
     return lines;
-  else if (mailvar_get (NULL, "crt", mailvar_type_boolean, 0) == 0)
+  else if (mailvar_is_true ("crt"))
     return util_getlines ();
   return 0;
 }
@@ -931,12 +931,11 @@ util_header_expand (mu_header_t *phdr)
 	      mu_address_t new_addr;
 	      char *p = ws.ws_wordv[j];
 	      
-	      /* If inplacealiases was set, the value was already expanded */
-	      if (mailvar_get (NULL, "inplacealiases",
-			       mailvar_type_boolean, 0))
-		exp = alias_expand (p);
-	      else
+	      if (mailvar_is_true ("inplacealiases"))
+	        /* If inplacealiases was set, the value was already expanded */
 		exp = p;
+	      else
+		exp = alias_expand (p);
 	      rc = mu_address_create (&new_addr, p);
 	      if (rc)
 		{
@@ -1072,7 +1071,7 @@ util_rfc2047_decode (char **value)
   rc = mu_rfc2047_decode (charset, *value, &tmp);
   if (rc)
     {
-      if (mailvar_get (NULL, "verbose", mailvar_type_boolean, 0) == 0)
+      if (mailvar_is_true ("verbose"))
 	mu_error (_("Cannot decode line `%s': %s"), *value, mu_strerror (rc));
     }
   else