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# buildLisp provides Nix functions to build Common Lisp packages,
# targeting SBCL.
#
# buildLisp is designed to enforce conventions and do away with the
# free-for-all of existing Lisp build systems.
{ pkgs ? { third_party = import <nixpkgs> {}; }
, ... }:
let
inherit (builtins) map elemAt match;
inherit (pkgs.third_party) lib runCommandNoCC writeText writeShellScriptBin sbcl;
#
# Internal helper definitions
#
# 'genLoadLisp' generates Lisp code that instructs SBCL to load all
# the provided Lisp libraries.
genLoadLisp = deps: lib.concatStringsSep "\n"
(map (lib: "(load \"${lib}/${lib.lispName}.fasl\")") (allDeps deps));
# 'genCompileLisp' generates a Lisp file that instructs SBCL to
# compile the provided list of Lisp source files to $out.
genCompileLisp = srcs: deps: writeText "compile.lisp" ''
;; This file compiles the specified sources into the Nix build
;; directory, creating one FASL file for each source.
(require 'sb-posix)
${genLoadLisp deps}
(defun nix-compile-lisp (file srcfile)
(let ((outfile (make-pathname :type "fasl"
:directory (or (sb-posix:getenv "NIX_BUILD_TOP")
(error "not running in a Nix build"))
:defaults srcfile)))
(multiple-value-bind (_outfile _warnings-p failure-p)
(compile-file srcfile :output-file outfile)
(if failure-p (sb-posix:exit 1)
(progn
;; For the case of multiple files belonging to the same
;; library being compiled, load them in order:
(load outfile)
;; Write them to the FASL list in the same order:
(format file "cat ~a~%" (namestring outfile)))))))
(let ((*compile-verbose* t)
;; FASL files are compiled into the working directory of the
;; build and *then* moved to the correct out location.
(pwd (sb-posix:getcwd)))
(with-open-file (file "cat_fasls"
:direction :output
:if-does-not-exist :create)
;; These forms were inserted by the Nix build:
${
lib.concatStringsSep "\n" (map (src: "(nix-compile-lisp file \"${src}\")") srcs)
}
))
'';
# 'dependsOn' determines whether Lisp library 'b' depends on 'a'.
dependsOn = a: b: builtins.elem a b.lispDeps;
# 'allDeps' flattens the list of dependencies (and their
# dependencies) into one ordered list of unique deps.
allDeps = deps: (lib.toposort dependsOn (lib.unique (
lib.flatten (deps ++ (map (d: d.lispDeps) deps))
))).result;
# 'genDumpLisp' generates a Lisp file that instructs SBCL to dump
# the currently loaded image as an executable to $out/bin/$name.
#
# TODO(tazjin): Compression is currently unsupported because the
# SBCL in nixpkgs is, by default, not compiled with zlib support.
genDumpLisp = name: main: deps: writeText "dump.lisp" ''
(require 'sb-posix)
${genLoadLisp deps}
(let* ((bindir (concatenate 'string (sb-posix:getenv "out") "/bin"))
(outpath (make-pathname :name "${name}"
:directory bindir)))
(save-lisp-and-die outpath
:executable t
:toplevel (function ${main})
:purify t))
;;
'';
# Add an `overrideLisp` attribute to a function result that works
# similar to `overrideAttrs`, but is used specifically for the
# arguments passed to Lisp builders.
makeOverridable = f: orig: (f orig) // {
overrideLisp = new: makeOverridable f (orig // (new orig));
};
#
# Public API functions
#
# 'library' builds a list of Common Lisp files into a single FASL
# which can then be loaded into SBCL.
library = { name, srcs, deps ? [] }: runCommandNoCC "${name}-cllib" {} ''
${sbcl}/bin/sbcl --script ${genCompileLisp srcs deps}
# FASL files can be combined by simply concatenating them
# together, but it needs to be in the compilation order.
mkdir $out
chmod +x cat_fasls
./cat_fasls > $out/${name}.fasl
'' // { lispName = name; lispDeps = deps; };
# 'program' creates an executable containing a dumped image of the
# specified sources and dependencies.
program = { name, main ? "${name}:main", srcs, deps ? [] }: runCommandNoCC "${name}" {} ''
mkdir -p $out/bin
${sbcl}/bin/sbcl --script ${
genDumpLisp name main (lib.singleton (library {
inherit name srcs deps;
}))
}
'';
# 'sbclWith' creates an image with the specified libraries /
# programs loaded.
sbclWith = deps: writeShellScriptBin "sbcl" ''
exec ${sbcl}/bin/sbcl ${
if deps == [] then ""
else "--load ${writeText "load.lisp" (genLoadLisp deps)}"
} $@
'';
in {
library = makeOverridable library;
program = makeOverridable program;
sbclWith = makeOverridable sbclWith;
}
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