startup: when an rcfile contains errors, report this on the status bar

Suggested-by: Brand Huntsman <alpha@qzx.com>

src/global.c

@@ -242,6 +242,8 @@ int interface_color_pair[] = {0};
 
 char *homedir = NULL;
 	/* The user's home directory, from $HOME or /etc/passwd. */
+char *rcfile_with_errors = NULL;
+	/* The first nanorc file, if any, that produced warnings. */
 
 
 /* Return the number of entries in the shortcut list for a given menu. */

src/nano.c

@@ -2594,6 +2594,9 @@ int main(int argc, char **argv)
 
     prepare_for_display();
 
+    if (rcfile_with_errors != NULL)
+	statusline(ALERT, _("Mistakes in '%s'"), rcfile_with_errors);
+
     while (TRUE) {
 #ifdef ENABLE_LINENUMBERS
 	int needed_margin = digits(openfile->filebot->lineno) + 1;

src/proto.h

@@ -181,6 +181,7 @@ extern char* specified_color_combo[NUMBER_OF_ELEMENTS];
 extern int interface_color_pair[NUMBER_OF_ELEMENTS];
 
 extern char *homedir;
+extern char *rcfile_with_errors;
 
 typedef void (*functionptrtype)(void);
 

src/rcfile.c

@@ -141,6 +141,9 @@ void rcfile_error(const char *msg, ...)
 {
     va_list ap;
 
+    if (rcfile_with_errors == NULL)
+	rcfile_with_errors = strdup(nanorc);
+
     if (lineno > 0)
 	fprintf(stderr, _("Error in %s on line %lu: "), nanorc, (unsigned long)lineno);