refactor(misc1): move msgmore function to messages.c

src/nvim/message.c

@@ -76,6 +76,8 @@ static int msg_hist_len = 0;
 static FILE *verbose_fd = NULL;
 static int verbose_did_open = FALSE;
 
+bool keep_msg_more = false;    // keep_msg was set by msgmore()
+
 /*
  * When writing messages to the screen, there are many different situations.
  * A number of variables is used to remember the current state:
@@ -1298,6 +1300,49 @@ void set_keep_msg(char *s, int attr)
   keep_msg_attr = attr;
 }
 
+void msgmore(long n)
+{
+  long pn;
+
+  if (global_busy           // no messages now, wait until global is finished
+      || !messaging()) {      // 'lazyredraw' set, don't do messages now
+    return;
+  }
+
+  // We don't want to overwrite another important message, but do overwrite
+  // a previous "more lines" or "fewer lines" message, so that "5dd" and
+  // then "put" reports the last action.
+  if (keep_msg != NULL && !keep_msg_more) {
+    return;
+  }
+
+  if (n > 0) {
+    pn = n;
+  } else {
+    pn = -n;
+  }
+
+  if (pn > p_report) {
+    if (n > 0) {
+      vim_snprintf(msg_buf, MSG_BUF_LEN,
+                   NGETTEXT("%ld more line", "%ld more lines", pn),
+                   pn);
+    } else {
+      vim_snprintf(msg_buf, MSG_BUF_LEN,
+                   NGETTEXT("%ld line less", "%ld fewer lines", pn),
+                   pn);
+    }
+    if (got_int) {
+      xstrlcat(msg_buf, _(" (Interrupted)"), MSG_BUF_LEN);
+    }
+    if (msg(msg_buf)) {
+      set_keep_msg(msg_buf, 0);
+      keep_msg_more = true;
+    }
+  }
+}
+
+
 void msg_ext_set_kind(const char *msg_kind)
 {
   // Don't change the label of an existing batch: