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Add shebang support for files using flakes. #196

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Add shebang support for files using flakes. #196

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16 changes: 12 additions & 4 deletions nix-shebang.el
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,9 @@
;; This detects file headers that look like:
;; #!/usr/bin/env nix-shell
;; #!nix-shell -i bash
;; As well as:
;; #!/usr/bin/env nix
;; #! nix shell nixpkgs#bash nixpkgs#hello nixpkgs#cowsay --command bash

;; and correctly detects their file modes.

Expand All @@ -20,14 +23,19 @@

(defvar nix-shebang-interpreter-regexp "#!\s*nix-shell -i \\([^ \t\n]+\\)"
"Regexp for nix-shell -i header.")
(defvar nix-shebang-flake-interpreter-regexp "^#!\s*nix .*--command \\(.*\\)"
"Regexp for nix shell script using flakes.")

(defun nix-shebang-get-interpreter ()
"Get interpreter string from nix-shell -i file."
"Get interpreter string"
(save-excursion
(goto-char (point-min))
(forward-line 1)
(when (looking-at nix-shebang-interpreter-regexp)
(match-string 1))))
(forward-line 1)
(if (looking-at nix-shebang-interpreter-regexp)
(match-string 1)
(if (and (re-search-forward nix-shebang-flake-interpreter-regexp nil t)
(looking-back nix-shebang-flake-interpreter-regexp))
(match-string 1)))))

(defun nix-shebang-mode ()
"Detect and run file’s interpreter mode."
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