Luke Granger-Brown
57725ef3ec
git-subtree-dir: third_party/nixpkgs git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
83 lines
2.4 KiB
Common Lisp
83 lines
2.4 KiB
Common Lisp
(defpackage org.lispbuilds.nix/nix
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(:documentation "Utilities for generating Nix code")
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(:use :cl)
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(:import-from :str)
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(:import-from :ppcre)
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(:import-from :arrow-macros :->>)
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(:import-from :org.lispbuilds.nix/util :replace-regexes)
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(:export
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:nix-eval
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:nixify-symbol
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:system-master
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:make-pname
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:*nix-attrs-depth*))
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(in-package org.lispbuilds.nix/nix)
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;; Path names are alphanumeric and can include the symbols +-._?= and
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;; must not begin with a period.
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(defun make-pname (string)
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(replace-regexes '("^[.]" "[^a-zA-Z0-9+-._?=]")
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'("_" "_")
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string))
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(defun system-master (system)
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(first (str:split "/" system)))
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;;;; Nix generation
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(defun nix-eval (exp)
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(assert (consp exp))
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(ecase (car exp)
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(:string (nix-string (cadr exp)))
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(:list (apply #'nix-list (rest exp)))
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(:funcall (apply #'nix-funcall (rest exp)))
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(:attrs (nix-attrs (cdr exp)))
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(:merge (apply #'nix-merge (cdr exp)))
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(:symbol (nix-symbol (cadr exp)))))
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(defun nix-string (object)
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(format nil "\"~a\"" object))
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(defun nixify-symbol (string)
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(flet ((fix-special-chars (str)
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(replace-regexes '("[_]" "[+]$" "[+][/]" "[+]" "[.]" "[/]")
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'("__" "_plus" "_plus/" "_plus_" "_dot_" "_slash_")
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str)))
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(if (ppcre:scan "^[0-9]" string)
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(str:concat "_" (fix-special-chars string))
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(fix-special-chars string))))
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(defun nix-symbol (object)
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(nixify-symbol (format nil "~a" object)))
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(defun nix-list (&rest things)
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(format nil "[ ~{~A~^ ~} ]" (mapcar 'nix-eval things)))
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(defvar *nix-attrs-depth* 0)
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(defun nix-attrs (keyvals)
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(when (null keyvals)
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(return-from nix-attrs "{}"))
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(let ((*nix-attrs-depth* (1+ *nix-attrs-depth*)))
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(format
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nil
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(->> "{~%*depth*~{~{~A = ~A;~}~^~%*depth*~}~%*depth-1*}"
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(str:replace-all "*depth*" (str:repeat *nix-attrs-depth* " "))
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(str:replace-all "*depth-1*" (str:repeat (1- *nix-attrs-depth*) " ")))
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(mapcar (lambda (keyval)
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(let ((key (car keyval))
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(val (cadr keyval)))
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(list (nix-symbol key)
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(nix-eval val))))
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keyvals))))
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(defun nix-funcall (fun &rest args)
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(format nil "(~a ~{~a~^ ~})"
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(nixify-symbol fun)
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(mapcar 'nix-eval args)))
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(defun nix-merge (a b)
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(format nil "(~a // ~b)"
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(nix-eval a)
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(nix-eval b)))
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