From a4069a3eed65f14b1149c6cda8638dcb49ab5027 Mon Sep 17 00:00:00 2001
From: glacambre <code@lacamb.re>
Date: Sun, 3 Oct 2021 16:19:25 +0200
Subject: feat(--headless): add on_print callback to stdioopen

This commit adds an on_print callback to stdioopen's dictionary
argument which lets the caller specify a function called each time
neovim will try to output something to stdout (e.g. on "echo" or
"echoerr" in --headless mode).
---
 src/nvim/eval/funcs.c  | 4 ++++
 src/nvim/eval/typval.h | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/nvim/eval')

diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index 5252c940f7..6d43097ddd 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -10213,6 +10213,10 @@ static void f_stdioopen(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   if (!tv_dict_get_callback(opts, S_LEN("on_stdin"), &on_stdin.cb)) {
     return;
   }
+  if (!tv_dict_get_callback(opts, S_LEN("on_print"), &on_print)) {
+    return;
+  }
+
   on_stdin.buffered = tv_dict_get_number(opts, "stdin_buffered");
   if (on_stdin.buffered && on_stdin.cb.type == kCallbackNone) {
     on_stdin.self = opts;
diff --git a/src/nvim/eval/typval.h b/src/nvim/eval/typval.h
index d1275d6512..ad01c01499 100644
--- a/src/nvim/eval/typval.h
+++ b/src/nvim/eval/typval.h
@@ -81,7 +81,8 @@ typedef struct {
   } data;
   CallbackType type;
 } Callback;
-#define CALLBACK_NONE ((Callback){ .type = kCallbackNone })
+#define CALLBACK_INIT { .type = kCallbackNone }
+#define CALLBACK_NONE ((Callback)CALLBACK_INIT)
 
 /// Structure holding dictionary watcher
 typedef struct dict_watcher {
-- 
cgit