* mu-config,mu-util.[ch]: try MAILDIR, they ~/Maildir as a guess for the maildir

src/mu-config.c

@@ -105,6 +105,8 @@ mu_config_options_group_query (MuConfigOptions *opts)
 
 
 
+
+
 void
 mu_config_init (MuConfigOptions *opts)
 {
@@ -120,8 +122,9 @@ mu_config_init (MuConfigOptions *opts)
 	opts->log_append = TRUE;
 	opts->log_stderr = FALSE;
 	
-	/* indexing */
-	opts->maildir = mu_util_dir_expand ("~/Maildir");
+	/* indexing */		
+	opts->maildir    = mu_util_guess_maildir ();
+
 	opts->cleanup = FALSE;
 	opts->reindex = FALSE;
 

src/mu-util.c

@@ -23,6 +23,11 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+
 #include "mu-util.h"
 
 char*
@@ -76,3 +81,34 @@ mu_util_strlist_free (GSList *lst)
 	g_slist_foreach (lst, (GFunc)g_free, NULL);
 	g_slist_free (lst);
 }
+
+
+static gboolean
+_is_readable_dir (const gchar* path)
+{
+	struct stat statbuf;
+
+	return path &&
+		access (path, F_OK) &&
+		stat (path, &statbuf) == 0 &&
+		S_ISDIR(statbuf.st_mode);
+}
+
+gchar*
+mu_util_guess_maildir (void)
+{
+	char *dir;
+
+	/* first, try MAILDIR */
+	dir = getenv ("MAILDIR");
+	if (_is_readable_dir (dir))
+		return g_strdup (dir);
+
+	/* then, try ~/Maildir */
+	dir = mu_util_dir_expand ("~/Maildir");
+	if (_is_readable_dir (dir))
+		return dir;
+
+	/* nope; nothing found */
+	return NULL;
+}

src/mu-util.h

@@ -35,6 +35,15 @@ G_BEGIN_DECLS
 char*       mu_util_dir_expand (const char* path);
 
 
+
+/** 
+ * guess the maildir; first try MAILDIR, then try ~/Maildir
+ * if both fail, return NULL
+ * 
+ * @return full path of the guessed Maildir, or NULL; must be freed (gfree)
+ */
+char*       mu_util_guess_maildir (void);
+
 /** 
  * take a char*[] and turn it into a GSList
  *