vim-patch:8.2.0578: heredoc for interfaces does not support "trim"

Problem:    Heredoc for interfaces does not support "trim".
Solution:   Update the script heredoc support to be same as the :let command.
            (Yegappan Lakshmanan, closes vim/vim#5916)

https://github.com/vim/vim/commit/6c2b7b8055b96463f78abb70f58c4c6d6d4b9d55

1 files changed, 13 insertions, 14 deletions

diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index c0c8a5605b..5018c9268b 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -29,6 +29,7 @@
 #include "nvim/edit.h"
 #include "nvim/eval.h"
 #include "nvim/eval/typval.h"
+#include "nvim/eval/vars.h"
 #include "nvim/ex_cmds.h"
 #include "nvim/ex_cmds_defs.h"
 #include "nvim/ex_docmd.h"
@@ -4561,39 +4562,37 @@ bool is_in_cmdwin(void)
 char *script_get(exarg_T *const eap, size_t *const lenp)
   FUNC_ATTR_NONNULL_ALL FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_MALLOC
 {
-  const char *const cmd = eap->arg;
+  char *cmd = eap->arg;
 
   if (cmd[0] != '<' || cmd[1] != '<' || eap->getline == NULL) {
     *lenp = strlen(eap->arg);
     return eap->skip ? NULL : xmemdupz(eap->arg, *lenp);
   }
+  cmd += 2;
 
   garray_T ga = { .ga_data = NULL, .ga_len = 0 };
+
+  list_T *const l = heredoc_get(eap, cmd, true);
+  if (l == NULL) {
+    return NULL;
+  }
+
   if (!eap->skip) {
     ga_init(&ga, 1, 0x400);
   }
 
-  const char *const end_pattern = (cmd[2] != NUL ? skipwhite(cmd + 2) : ".");
-  while (true) {
-    char *const theline = eap->getline(eap->cstack->cs_looplevel > 0 ? -1 : NUL, eap->cookie, 0,
-                                       true);
-
-    if (theline == NULL || strcmp(end_pattern, theline) == 0) {
-      xfree(theline);
-      break;
-    }
-
+  TV_LIST_ITER_CONST(l, li, {
     if (!eap->skip) {
-      ga_concat(&ga, theline);
+      ga_concat(&ga, tv_get_string(TV_LIST_ITEM_TV(li)));
       ga_append(&ga, '\n');
     }
-    xfree(theline);
-  }
+  });
   *lenp = (size_t)ga.ga_len;  // Set length without trailing NUL.
   if (!eap->skip) {
     ga_append(&ga, NUL);
   }
 
+  tv_list_free(l);
   return (char *)ga.ga_data;
 }