neovim/runtime/queries/lua/injections.scm

((function_call
  name:
    [
      (identifier) @_cdef_identifier
      (_
        _
        (identifier) @_cdef_identifier)
    ]
  arguments:
    (arguments
      (string
        content: _ @injection.content)))
  (#set! injection.language "c")
  (#eq? @_cdef_identifier "cdef"))

((function_call
  name: (_) @_vimcmd_identifier
  arguments:
    (arguments
      (string
        content: _ @injection.content)))
  (#set! injection.language "vim")
  (#any-of? @_vimcmd_identifier "vim.cmd" "vim.api.nvim_command" "vim.api.nvim_command" "vim.api.nvim_exec2"))

((function_call
  name: (_) @_vimcmd_identifier
  arguments:
    (arguments
      (string
        content: _ @injection.content) .))
  (#set! injection.language "query")
  (#any-of? @_vimcmd_identifier "vim.treesitter.query.set" "vim.treesitter.query.parse"))

((function_call
  name: (_) @_vimcmd_identifier
  arguments:
    (arguments
      .
      (_)
      .
      (string
        content: _ @_method)
      .
      (string
        content: _ @injection.content)))
  (#any-of? @_vimcmd_identifier "vim.rpcrequest" "vim.rpcnotify")
  (#eq? @_method "nvim_exec_lua")
  (#set! injection.language "lua"))

; vim.api.nvim_create_autocmd("FileType", { command = "injected here" })
(function_call
  name: (_) @_vimcmd_identifier
  arguments:
    (arguments
      .
      (_)
      .
      (table_constructor
        (field
          name: (identifier) @_command
          value:
            (string
              content: (_) @injection.content))) .)
  ; limit so only 2-argument functions gets matched before pred handle
  (#eq? @_vimcmd_identifier "vim.api.nvim_create_autocmd")
  (#eq? @_command "command")
  (#set! injection.language "vim"))

(function_call
  name: (_) @_user_cmd
  arguments:
    (arguments
      .
      (_)
      .
      (string
        content: (_) @injection.content)
      .
      (_) .)
  (#eq? @_user_cmd "vim.api.nvim_create_user_command")
  (#set! injection.language "vim"))

(function_call
  name: (_) @_user_cmd
  arguments:
    (arguments
      .
      (_)
      .
      (_)
      .
      (string
        content: (_) @injection.content)
      .
      (_) .)
  ; Limiting predicate handling to only functions with 4 arguments
  (#eq? @_user_cmd "vim.api.nvim_buf_create_user_command")
  (#set! injection.language "vim"))

; rhs highlighting for vim.keymap.set/vim.api.nvim_set_keymap/vim.api.nvim_buf_set_keymap
; (function_call
;   name: (_) @_map
;   arguments:
;     (arguments
;       . (_)
;       . (_)
;       .
;       (string
;         content: (_) @injection.content))
;   (#any-of? @_map "vim.api.nvim_set_keymap" "vim.keymap.set")
;   (#set! injection.language "vim"))
;
; (function_call
;   name: (_) @_map
;   arguments:
;     (arguments
;       . (_)
;       . (_)
;       . (_)
;       .
;       (string
;         content: (_) @injection.content)
;       . (_) .)
;   (#eq? @_map "vim.api.nvim_buf_set_keymap")
;   (#set! injection.language "vim"))
; highlight string as query if starts with `;; query`
(string
  content: _ @injection.content
  (#lua-match? @injection.content "^%s*;+%s?query")
  (#set! injection.language "query"))