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eval: add v:_null_string

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Replacement for Vim's test_null_string().
Vim uses it to verify that its codebase handles null strings.
Preparation for the Test_null_list() in patch v8.2.1822.

Use v:_null_string, not non-existent env var, for null string tests.

Mention v:_null_string in id() because id(v:_null_string) returns (nil).
This commit is contained in:
Jan Edmund Lazo
2021-04-08 22:33:21 -04:00
parent ec273a2c6b
commit 0d0eeff8a3
5 changed files with 45 additions and 8 deletions
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1
src/nvim/eval.c
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@@ -229,6 +229,7 @@ static struct vimvar {
// Neovim
VV(VV_STDERR, "stderr", VAR_NUMBER, VV_RO),
VV(VV_MSGPACK_TYPES, "msgpack_types", VAR_DICT, VV_RO),
VV(VV__NULL_STRING, "_null_string", VAR_STRING, VV_RO),
VV(VV__NULL_LIST, "_null_list", VAR_LIST, VV_RO),
VV(VV__NULL_DICT, "_null_dict", VAR_DICT, VV_RO),
VV(VV_LUA, "lua", VAR_PARTIAL, VV_RO),

1
src/nvim/eval.h
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@@ -158,6 +158,7 @@ typedef enum {
// Neovim
VV_STDERR,
VV_MSGPACK_TYPES,
VV__NULL_STRING, // String with NULL value. For test purposes only.
VV__NULL_LIST, // List with NULL value. For test purposes only.
VV__NULL_DICT, // Dictionary with NULL value. For test purposes only.
VV_LUA,