+enum {
+ ACL_LOOKUP = 0,
+ ACL_READ,
+ ACL_SEEN,
+ ACL_WRITE,
+ ACL_INSERT,
+ ACL_POST,
+ ACL_CREATE,
+ ACL_DELETE,
+ ACL_ADMIN,
+
+ RIGHTSMAX
+};
+
+/* ugly hack to define macro once (for pager+index) */
+#define CHECK_MX_ACL(c,f,s) if(!mx_acl_check(c,f)) \
+ {\
+ mutt_flushinp (); \
+ mutt_error(_("%s not permitted by ACL."), s); \
+ break; \
+ }
+
+typedef struct {
+ FILE *fp; /* pointer to the message data */
+ char *path; /* path to temp file */
+ short magic; /* type of mailbox this message belongs to */
+ short write; /* nonzero if message is open for writing */
+ struct {
+ unsigned read:1;
+ unsigned flagged:1;
+ unsigned replied:1;
+ } flags;
+ time_t received; /* the time at which this message was received */
+} MESSAGE;
+
+typedef struct {
+ /* folder magic */
+ int type;
+ /* may we stat() it? */
+ unsigned int local : 1;
+ /* tests if given path is of its magic */
+ int (*mx_is_magic) (const char*, struct stat*);
+ /* tests if folder is empty */
+ int (*mx_check_empty) (const char*);
+ /* test for access */
+ int (*mx_access) (const char*, int);
+ /* read mailbox into ctx structure */
+ int (*mx_open_mailbox) (CONTEXT*);
+ /* open new message */
+ int (*mx_open_new_message) (MESSAGE*, CONTEXT*, HEADER*);
+ /* check ACL flags; if not implemented, always assume granted
+ * permissions */
+ int (*mx_acl_check) (CONTEXT*, int);
+ /* check for new mail; see mx_check_mailbox() below for return vals */
+ int (*mx_check_mailbox) (CONTEXT*, int*, int);
+ /* fast closing */
+ void (*mx_fastclose_mailbox) (CONTEXT*);
+ /* write out changes */
+ int (*mx_sync_mailbox) (CONTEXT*, int, int*);
+ /* commit a message to a folder */
+ int (*mx_commit_message) (MESSAGE*, CONTEXT*);
+} mx_t;
+
+/* called from main: init all folder types */
+void mx_init (void);
+
+/* flags for mx_open_mailbox() */
+#define M_NOSORT (1<<0) /* do not sort the mailbox after opening it */
+#define M_APPEND (1<<1) /* open mailbox for appending messages */
+#define M_READONLY (1<<2) /* open in read-only mode */
+#define M_QUIET (1<<3) /* do not print any messages */
+#define M_NEWFOLDER (1<<4) /* create a new folder - same as M_APPEND, but uses
+ * safe_fopen() for mbox-style folders. */
+#define M_COUNT (1<<5) /* just do counting? needed to do speed optimizations
+ for sidebar */
+
+/* mx_open_new_message() */
+#define M_ADD_FROM 1 /* add a From_ line */