fix: make `nvim_cmd` not suppress errors inside key mapping

Closes #18632

3 files changed, 35 insertions, 17 deletions

diff --git a/src/nvim/api/vimscript.c b/src/nvim/api/vimscript.c
index b8f7b33cd5..e71f1a11ec 100644
--- a/src/nvim/api/vimscript.c
+++ b/src/nvim/api/vimscript.c
@@ -1304,20 +1304,23 @@ String nvim_cmd(uint64_t channel_id, Dict(cmd) *cmd, Dict(cmd_opts) *opts, Error
     capture_ga = &capture_local;
   }
 
-  try_start();
-  if (output) {
-    msg_silent++;
-  }
+  TRY_WRAP({
+    try_start();
+    if (output) {
+      msg_silent++;
+    }
 
-  WITH_SCRIPT_CONTEXT(channel_id, {
-    execute_cmd(&ea, &cmdinfo);
-  });
+    WITH_SCRIPT_CONTEXT(channel_id, {
+      execute_cmd(&ea, &cmdinfo);
+    });
 
-  if (output) {
-    capture_ga = save_capture_ga;
-    msg_silent = save_msg_silent;
-  }
-  try_end(err);
+    if (output) {
+      capture_ga = save_capture_ga;
+      msg_silent = save_msg_silent;
+    }
+
+    try_end(err);
+  });
 
   if (ERROR_SET(err)) {
     goto clear_ga;
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 7506c353dd..5f9d73a25a 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -1583,13 +1583,14 @@ bool parse_cmdline(char *cmdline, exarg_T *eap, CmdParseInfo *cmdinfo, char **er
 /// @param cmdinfo Command parse information
 void execute_cmd(exarg_T *eap, CmdParseInfo *cmdinfo)
 {
+  char *errormsg = NULL;
+
 #define ERROR(msg) \
   do { \
-    emsg(msg); \
+    errormsg = msg; \
     goto end; \
   } while (0)
 
-  char *errormsg = NULL;
   cmdmod_T save_cmdmod = cmdmod;
   cmdmod = cmdinfo->cmdmod;
 
@@ -1648,7 +1649,7 @@ void execute_cmd(exarg_T *eap, CmdParseInfo *cmdinfo)
   // If filename expansion is enabled, expand filenames
   if (cmdinfo->magic.file) {
     if (expand_filename(eap, (char_u **)eap->cmdlinep, &errormsg) == FAIL) {
-      ERROR(errormsg);
+      goto end;
     }
   }
 
@@ -1706,14 +1707,20 @@ void execute_cmd(exarg_T *eap, CmdParseInfo *cmdinfo)
     eap->errmsg = NULL;
     (cmdnames[eap->cmdidx].cmd_func)(eap);
     if (eap->errmsg != NULL) {
-      ERROR(_(eap->errmsg));
+      errormsg = _(eap->errmsg);
     }
   }
+
 end:
+  if (errormsg != NULL && *errormsg != NUL) {
+    emsg(errormsg);
+  }
   // Undo command modifiers
   undo_cmdmod(eap, msg_scroll);
   cmdmod = save_cmdmod;
-
+  if (eap->did_sandbox) {
+    sandbox--;
+  }
 #undef ERROR
 }
 
diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index c4748cc00d..c5e8cfee23 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -3636,5 +3636,13 @@ describe('API', function()
       meths.cmd({ cmd = "update" }, {})
       meths.cmd({ cmd = "buffer", count = 0 }, {})
     end)
+    it('doesn\'t suppress errors when used in keymapping', function()
+      meths.exec_lua([[
+        vim.keymap.set("n", "[l",
+                       function() vim.api.nvim_cmd({ cmd = "echo", args = {"foo"} }, {}) end)
+      ]], {})
+      feed("[l")
+      neq(nil, string.find(eval("v:errmsg"), "E5108:"))
+    end)
   end)
 end)