From 1971cc30b50ba77f55c7693eff716e564ce5c8e2 Mon Sep 17 00:00:00 2001
From: Rui Abreu Ferreira <raf-ep@gmx.com>
Date: Thu, 29 May 2014 15:42:08 +0100
Subject: [PATCH] Add --api-metadata command line option

- New command line option prints the binary API metadata object
  and exits
---
 scripts/msgpack-gen.lua | 3 ++-
 src/nvim/main.c         | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/scripts/msgpack-gen.lua b/scripts/msgpack-gen.lua
index fac1b10b45..8d7bb8ea59 100644
--- a/scripts/msgpack-gen.lua
+++ b/scripts/msgpack-gen.lua
@@ -100,7 +100,7 @@ end
 output:write([[
 
 
-static const uint8_t msgpack_metadata[] = {
+const uint8_t msgpack_metadata[] = {
 
 ]])
 -- serialize the API metadata using msgpack and embed into the resulting
@@ -116,6 +116,7 @@ end
 -- usually it is the first function called by clients.
 output:write([[
 };
+const unsigned int msgpack_metadata_size = sizeof(msgpack_metadata);
 
 void msgpack_rpc_dispatch(uint64_t channel_id, msgpack_object *req, msgpack_packer *res)
 {
diff --git a/src/nvim/main.c b/src/nvim/main.c
index ffb83ae7d8..97fc5b0712 100644
--- a/src/nvim/main.c
+++ b/src/nvim/main.c
@@ -135,6 +135,8 @@ static void check_swap_exists_action(void);
 # endif
 #endif /* NO_VIM_MAIN */
 
+extern const uint8_t msgpack_metadata[];
+extern const unsigned int msgpack_metadata_size;
 
 /*
  * Different types of error messages.
@@ -1047,6 +1049,11 @@ static void command_line_scan(mparm_T *parmp)
             msg_putchar('\n');
             msg_didout = FALSE;
             mch_exit(0);
+	  } else if (STRICMP(argv[0] + argv_idx, "api-metadata") == 0) {
+            for (unsigned int i = 0; i<msgpack_metadata_size; i++) {
+              putchar(msgpack_metadata[i]);
+            }
+            mch_exit(0);
           } else if (STRNICMP(argv[0] + argv_idx, "literal", 7) == 0) {
 #if !defined(UNIX)
             parmp->literal = TRUE;
@@ -2240,6 +2247,7 @@ static void usage(void)
   main_msg(_("--startuptime <file>\tWrite startup timing messages to <file>"));
 #endif
   main_msg(_("-i <viminfo>\t\tUse <viminfo> instead of .viminfo"));
+  main_msg(_("--api-metadata\tDump API metadata information and exit"));
   main_msg(_("-h  or  --help\tPrint Help (this message) and exit"));
   main_msg(_("--version\t\tPrint version information and exit"));