* feat(snippet): Add support for vsnip

Co-authored-by: danymat <d.danymat@gmail.com>

README.md

@@ -100,7 +100,7 @@ And this is done via the `snippet_engine` option in neogen's setup:
 
 - `snippet_engine` option will use provided engine to place the annotations:
 
-Currently supported: `luasnip`, `snippy`.
+Currently supported: `luasnip`, `snippy`, `vsnip`.
 
 ```lua
 require('neogen').setup({ snippet_engine = "luasnip" })

lua/neogen/init.lua

@@ -241,6 +241,8 @@ end
 ---
 --- Note: We will only document `major` and `minor` versions, not `patch` ones. (only X and Y in X.Y.z)
 ---
+--- ## 2.9.0~
+---   - Add support for `vsnip` snippet engine ! (see |neogen-snippet-integration|)
 --- ## 2.8.0~
 ---   - Specify annotation convention on `generate()` method (see |neogen.generate()|)
 --- ## 2.7.0~
@@ -280,7 +282,7 @@ end
 ---     with multiple annotation conventions.
 ---@tag neogen-changelog
 ---@toc_entry Changes in neogen plugin
-neogen.version = "2.8.1"
+neogen.version = "2.9.0"
 --minidoc_afterlines_end
 
 return neogen

lua/neogen/snippet.lua

@@ -12,6 +12,7 @@ local conf = require("neogen.config").get()
 --- Some snippet engines come out of the box bundled with neogen:
 --- - `"luasnip"` (https://github.com/L3MON4D3/LuaSnip)
 --- - `"snippy"` (https://github.com/dcampos/nvim-snippy)
+--- - `"vsnip"` (https://github.com/hrsh7th/vim-vsnip)
 ---
 --- If you want to customize the placeholders, you can use `placeholders_text` option:
 --- >
@@ -112,4 +113,21 @@ snippet.engines.snippy = function (snip, pos)
     snippy.expand_snippet({body = snip})
 end
 
+--- Expand snippet for vsnip engine
+---@param snip string the snippet to expand
+---@param pos table a tuple of row, col
+---@private
+snippet.engines.vsnip = function (snip, pos)
+    local ok = vim.g.loaded_vsnip
+    if not ok then
+        notify("Vsnip not found, aborting...", vim.log.levels.ERROR)
+        return
+    end
+    local row, _ = unpack(pos)
+    vim.api.nvim_buf_set_lines(0, row, row, true, {''}) -- vsnip will change `row`
+    vim.api.nvim_win_set_cursor(0, {row + 1, 0}) -- `snip` already has indent so we should ignore `col`
+    snip = table.concat(snip, "\n") -- vsnip expects on string instead of a list/table of lines
+    vim.fn["vsnip#anonymous"](snip)
+end
+
 return snippet