From b42d8799b4bb25873ad176bde27af0edfdff2634 Mon Sep 17 00:00:00 2001
From: "B. Petersen" <r10s@b44t.com>
Date: Tue, 12 Nov 2019 12:22:02 +0100
Subject: [PATCH] add dc_add_device_msg_once() to fii

---
 deltachat-ffi/deltachat.h | 22 ++++++++++++++++++++++
 deltachat-ffi/src/lib.rs  | 21 +++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/deltachat-ffi/deltachat.h b/deltachat-ffi/deltachat.h
index fa13b6e5f..91001b744 100644
--- a/deltachat-ffi/deltachat.h
+++ b/deltachat-ffi/deltachat.h
@@ -1113,6 +1113,28 @@ void            dc_set_draft                 (dc_context_t* context, uint32_t ch
 uint32_t        dc_add_device_msg            (dc_context_t* context, dc_msg_t* msg);
 
 
+/**
+ * Add a message only one time to the device-chat.
+ * The device-message is defined by a name.
+ * If a message with the same name was added before,
+ * the message is not added again.
+ * Use dc_add_device_msg() to add device-messages unconditionally.
+ *
+ * Sends the event #DC_EVENT_MSGS_CHANGED on success.
+ *
+ * @memberof dc_context_t
+ * @param context The context as created by dc_context_new().
+ * @param label A unique name for the message to add.
+ *     The label is typically not displayed to the user and
+ *     must be created from the characters `A-Z`, `a-z`, `0-9`, `_` or `-`.
+ * @param msg Message to be added to the device-chat.
+ *     The message appears to the user as an incoming message.
+ * @return The ID of the added message,
+ *     this might be the id of an older message with the same name.
+ */
+uint32_t        dc_add_device_msg_once       (dc_context_t* context, const char* label, dc_msg_t* msg);
+
+
 /**
  * Get draft for a chat, if any.
  * See dc_set_draft() for more details about drafts.
diff --git a/deltachat-ffi/src/lib.rs b/deltachat-ffi/src/lib.rs
index 6c52f09ca..b7895549d 100644
--- a/deltachat-ffi/src/lib.rs
+++ b/deltachat-ffi/src/lib.rs
@@ -828,6 +828,27 @@ pub unsafe extern "C" fn dc_add_device_msg(context: *mut dc_context_t, msg: *mut
         .unwrap_or(0)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn dc_add_device_msg_once(
+    context: *mut dc_context_t,
+    label: *const libc::c_char,
+    msg: *mut dc_msg_t,
+) -> u32 {
+    if context.is_null() || label.is_null() || msg.is_null() {
+        eprintln!("ignoring careless call to dc_add_device_msg_once()");
+        return 0;
+    }
+    let ffi_context = &mut *context;
+    let ffi_msg = &mut *msg;
+    ffi_context
+        .with_inner(|ctx| {
+            chat::add_device_msg_once(ctx, &to_string_lossy(label), &mut ffi_msg.message)
+                .unwrap_or_log_default(ctx, "Failed to add device message once")
+        })
+        .map(|msg_id| msg_id.to_u32())
+        .unwrap_or(0)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn dc_get_draft(context: *mut dc_context_t, chat_id: u32) -> *mut dc_msg_t {
     if context.is_null() {