helix-plus/runtime/queries/nix/injections.scm

((comment) @injection.content
 (#set! injection.language "comment"))

; mark arbitary languages with a comment
((((comment) @injection.language) .
  (indented_string_expression (string_fragment) @injection.content))
  (#set! injection.combined))

; Common attribute keys corresponding to scripts,
; such as those of stdenv.mkDerivation.
((binding
   attrpath: (attrpath (identifier) @_path)
   expression: [
     (indented_string_expression (string_fragment) @injection.content)
     (binary_expression (indented_string_expression (string_fragment) @injection.content))
   ])
 (#match? @_path "(^\\w*Phase|command|(pre|post)\\w*|(.*\\.)?\\w*([sS]cript|[hH]ook)|(.*\\.)?startup)$")
 (#set! injection.language "bash")
 (#set! injection.combined))

; builtins.{match,split} regex str
; Example: nix/tests/lang/eval-okay-regex-{match,split}.nix
((apply_expression
   function: (_) @_func
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)match|split$")
 (#set! injection.language "regex")
 (#set! injection.combined))

; builtins.fromJSON json
; Example: nix/tests/lang/eval-okay-fromjson.nix
((apply_expression
   function: (_) @_func
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)fromJSON$")
 (#set! injection.language "json")
 (#set! injection.combined))

; trivial-builders.nix pkgs.writeShellScript[Bin] name content
((apply_expression
   function: (apply_expression function: (_) @_func)
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)writeShellScript(Bin)?$")
 (#set! injection.language "bash")
 (#set! injection.combined))

; trivial-builders.nix, aliases.nix
; pkgs.runCommand[[No]CC][Local] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)runCommand(((No)?(CC))?(Local)?)?$")
  (#set! injection.language "bash")
  (#set! injection.combined))

; trivial-builders.nix pkgs.writeShellApplication { text = content; }
(apply_expression
  function: ((_) @_func)
  argument: (_ (_)* (_ (_)* (binding
    attrpath: (attrpath (identifier) @_path)
     expression: (indented_string_expression
       (string_fragment) @injection.content))))
  (#match? @_func "(^|\\.)writeShellApplication$")
  (#match? @_path "^text$")
  (#set! injection.language "bash")
  (#set! injection.combined))

; trivial-builders.nix pkgs.writeCBin name content
((apply_expression
   function: (apply_expression function: (_) @_func)
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)writeC(Bin)?$")
 (#set! injection.language "c")
 (#set! injection.combined))

; pkgs.writers.* usage examples: nixpkgs/pkgs/build-support/writers/test.nix

; pkgs.writers.write{Bash,Dash}[Bin] name content
((apply_expression
   function: (apply_expression function: (_) @_func)
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)write[BD]ash(Bin)?$")
 (#set! injection.language "bash")
 (#set! injection.combined))

; pkgs.writers.writeFish[Bin] name content
((apply_expression
   function: (apply_expression function: (_) @_func)
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)writeFish(Bin)?$")
 (#set! injection.language "fish")
 (#set! injection.combined))

; pkgs.writers.writeRust[Bin] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)writeRust(Bin)?$")
  (#set! injection.language "rust")
  (#set! injection.combined))

; pkgs.writers.writeHaskell[Bin] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)writeHaskell(Bin)?$")
  (#set! injection.language "haskell")
  (#set! injection.combined))

; pkgs.writers.writeJS[Bin] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)writeJS(Bin)?$")
  (#set! injection.language "javascript")
  (#set! injection.combined))

; pkgs.writers.writePerl[Bin] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)writePerl(Bin)?$")
  (#set! injection.language "perl")
  (#set! injection.combined))

; pkgs.writers.write{Python,PyPy}{2,3}[Bin] name attrs content
(apply_expression
  (apply_expression
    function: (apply_expression
      function: ((_) @_func)))
    argument: (indented_string_expression (string_fragment) @injection.content)
  (#match? @_func "(^|\\.)write(Python|PyPy)[23](Bin)?$")
  (#set! injection.language "python")
  (#set! injection.combined))

; pkgs.writers.writeFSharp[Bin] name content
; No query available for f-sharp as of the time of writing
; See: https://github.com/helix-editor/helix/issues/4943
; ((apply_expression
;    function: (apply_expression function: (_) @_func)
;    argument: (indented_string_expression (string_fragment) @injection.content))
;  (#match? @_func "(^|\\.)writeFSharp(Bin)?$")
;  (#set! injection.language "f-sharp")
;  (#set! injection.combined))

((apply_expression
   function: (apply_expression function: (_) @_func
     argument: (string_expression (string_fragment) @injection.filename))
   argument: (indented_string_expression (string_fragment) @injection.content))
 (#match? @_func "(^|\\.)write(Text|Script(Bin)?)$")
 (#set! injection.combined))

((indented_string_expression (string_fragment) @injection.shebang @injection.content)
  (#set! injection.combined))