Added send_to_simai.

autoload/send_to_simai.vim

@@ -0,0 +1,28 @@
+vim9script
+
+if get(g:, "devcontainer_vim", v:false)
+  export def Send(host: string, port: number)
+    var buffer_content = join(getbufline('%', 1, '$'), "\n")
+    call send_to_simai#SendWithText(buffer_content, host, port)
+  enddef
+
+  export def SendWithText(text: string, host: string, port: number)
+    var channelToSimai = ch_open($"{host}:{port}", {"mode": "raw"})
+    call ch_sendraw(channelToSimai, text, {})
+    call ch_close(channelToSimai)
+  enddef
+
+  export def StartPreview()
+    augroup devcontainer_md
+        autocmd!
+        autocmd BufWritePost *.md execute ':call send_to_simai#Send("host.docker.internal", 7878)'
+    augroup END
+  enddef
+
+  export def StopPreview()
+    augroup devcontainer_md
+        autocmd!
+    augroup END
+  enddef
+endif
+

vimrc

@@ -175,6 +175,11 @@ augroup devcontainer_json
     autocmd BufEnter *devcontainer.json setlocal ft=json5
     autocmd BufEnter *devcontainer.vim.json setlocal ft=json5
 augroup END
+
+if get(g:, "devcontainer_vim", v:false)
+  command! StartMdPreview :call send_to_simai#StartPreview()
+  command! StopMdPreview :call send_to_simai#StopPreview()
+endif
 """ }}}
 
 """ {{{ highlight white spaces