vim-patch:8.1.0735: cannot handle binary data

Problem:    Cannot handle binary data.
Solution:   Add the Blob type. (Yasuhiro Matsumoto, closes vim/vim#3638)
https://github.com/vim/vim/commit/6e5ea8d2a995b32bbc5972edc4f827b959f2702f

Nvim-specific Blob conversions are implemented in future commits.

Refactor write_blob() to use a FileDescriptor, as f_writefile() was
refactored to use one (does not apply to read_blob()).

Use var_check_lock() in f_add() for Blobs from v8.1.0897.

Add a modeline to test_blob.vim and fix some doc typos.

Include if_perl.txt's VIM::Blob() documentation. Interestingly, this
function already worked before this port, as it just returns a Blob
string literal, not an actual Blob object.

N/A patches for version.c:

vim-patch:8.1.0741: viminfo with Blob is not tested

Problem:    Viminfo with Blob is not tested.
Solution:   Extend the viminfo test.  Fix reading a blob.  Fixed storing a
            special variable value.
https://github.com/vim/vim/commit/8c8b8bb56c724cc1bfc3d8520eec33f2d399697c

vim-patch:8.1.1022: may use NULL pointer when out of memory

Problem:    May use NULL pointer when out of memory. (Coverity)
Solution:   Check for blob_alloc() returning NULL.
https://github.com/vim/vim/commit/e142a9467a7f6845a426d8db6efedf246d3c13ac

1 files changed, 14 insertions, 0 deletions

diff --git a/src/nvim/eval/executor.c b/src/nvim/eval/executor.c
index 8ac2c3b8eb..5ced2a0535 100644
--- a/src/nvim/eval/executor.c
+++ b/src/nvim/eval/executor.c
@@ -38,6 +38,20 @@ int eexe_mod_op(typval_T *const tv1, const typval_T *const tv2,
       case VAR_SPECIAL: {
         break;
       }
+      case VAR_BLOB: {
+       if (*op != '+' || tv2->v_type != VAR_BLOB) {
+         break;
+       }
+       // Blob += Blob
+       if (tv1->vval.v_blob != NULL && tv2->vval.v_blob != NULL) {
+         blob_T *const b1 = tv1->vval.v_blob;
+         blob_T *const b2 = tv2->vval.v_blob;
+         for (int i = 0; i < tv_blob_len(b2); i++) {
+           ga_append(&b1->bv_ga, (char)tv_blob_get(b2, i));
+         }
+       }
+       return OK;
+      }
       case VAR_LIST: {
         if (*op != '+' || tv2->v_type != VAR_LIST) {
           break;