* guile: add mu:timestamp accessor to <mu:message>, implement it

guile/mu-guile-message.c

@@ -40,6 +40,10 @@ struct _MuMsgWrapper {
 typedef struct _MuMsgWrapper MuMsgWrapper;
 static long MSG_TAG;
 
+/* pseudo field, not in Xapian */
+#define MU_GUILE_MSG_FIELD_ID_TIMESTAMP (MU_MSG_FIELD_ID_NUM + 1)
+
+
 static gboolean
 mu_guile_scm_is_msg (SCM scm)
 {
@@ -250,7 +254,9 @@ SCM_DEFINE_PUBLIC(get_field, "mu:get-field", 2, 0, 0,
 	SCM_ASSERT (scm_integer_p(FIELD), FIELD, SCM_ARG2, FUNC_NAME);
 
 	mfid = scm_to_int (FIELD);
-	SCM_ASSERT (mfid < MU_MSG_FIELD_ID_NUM, FIELD, SCM_ARG2, FUNC_NAME);
+	SCM_ASSERT (mfid < MU_MSG_FIELD_ID_NUM ||
+		    mfid == MU_GUILE_MSG_FIELD_ID_TIMESTAMP,
+		    FIELD, SCM_ARG2, FUNC_NAME);
 
 	switch (mfid) {
 	case MU_MSG_FIELD_ID_PRIO:  return get_prio_scm (msgwrap->_msg);
@@ -267,6 +273,11 @@ SCM_DEFINE_PUBLIC(get_field, "mu:get-field", 2, 0, 0,
 		return data;
 	}
 
+	/* our pseudo-field; we get it from the message file */
+	case MU_GUILE_MSG_FIELD_ID_TIMESTAMP:
+		return scm_from_uint (
+			(unsigned)mu_msg_get_timestamp(msgwrap->_msg));
+
 	default: break;
 	}
 
@@ -541,6 +552,9 @@ static struct  {
 	{ "mu:field:subject",	MU_MSG_FIELD_ID_SUBJECT },
 	{ "mu:field:tags",	MU_MSG_FIELD_ID_TAGS },
 	{ "mu:field:to",	MU_MSG_FIELD_ID_TO },
+
+	/* non-Xapian field: timestamp */
+	{ "mu:field:timestamp",  MU_GUILE_MSG_FIELD_ID_TIMESTAMP }
 };
 
 

guile/mu-guile.texi

@@ -300,7 +300,7 @@ messages if the search expression is omitted).
 @verbatim
 scheme@(guile-user)> (mu:for-each-message
                        (lambda(msg)
-                         (display (subject msg))
+                         (display (mu:subject msg))
                          (newline))
                       "subject:coffee")
 Re: best coffee ever!
@@ -346,7 +346,10 @@ refers to in(mu: the @t{References:} header
 @item @code{(mu:size msg)}: size of the message in bytes
 @item @code{(mu:subject msg)}: the @t{Subject} field of the message, or @t{#f} if there is none.
 @item @code{(mu:tags msg)}: list of tags for this message
-@item @code{(mu:to msg)}: the sender of the message, or @t{#f} if there is none.
+@item @code{(mu:timestamp msg)}: the timestamp (mtime) of the message file, or
+#f if there is none.
+message file
+@item @code{(mu:to msg)}: the sender of the message, or @t{#f} if there is none
 @end itemize
 
 With these methods, we can query messages for their properties; for example:

guile/mu/message.scm

@@ -44,6 +44,7 @@
 	    mu:field:size
 	    mu:field:subject
 	    mu:field:tags
+	    mu:field:timestamp
 	    mu:field:to))
 
 (load-extension "libguile-mu" "mu_guile_message_init")
@@ -74,6 +75,7 @@
 (define-getter mu:size	     mu:field:size)
 (define-getter mu:subject    mu:field:subject)
 (define-getter mu:tags	     mu:field:tags)
+(define-getter mu:timestamp  mu:field:timestamp)
 (define-getter mu:to	     mu:field:to)
 
 

lib/mu-msg.c

@@ -360,6 +360,31 @@ mu_msg_get_header (MuMsg *self, const char *header)
 }
 
 
+time_t
+mu_msg_get_timestamp (MuMsg *self)
+{
+	g_return_val_if_fail (self, 0);
+
+	if (self->_file)
+		return self->_file->_timestamp;
+	else {
+		const char *path;
+		struct stat statbuf;
+
+		path = mu_msg_get_path (self);
+		if (!path)
+			return 0;
+
+		if (stat (path, &statbuf) < 0)
+			return 0;
+
+		return statbuf.st_mtime;
+	}
+}
+
+
+
+
 const char*
 mu_msg_get_path (MuMsg *self)
 {
@@ -535,7 +560,6 @@ mu_msg_contact_new (const char *name, const char *address,
 void
 mu_msg_contact_destroy (MuMsgContact *self)
 {
-
 	if (!self)
 		return;
 

lib/mu-msg.h

@@ -320,7 +320,6 @@ MuMsgPrio   mu_msg_get_prio        (MuMsg *msg);
 time_t     mu_msg_get_timestamp       (MuMsg *msg);
 
 
-
 /**
  * get a specific header from the message. This value will _not_ be
  * cached