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# Copyright 2019 Google LLC.
# SPDX-License-Identifier: Apache-2.0
{ pkgs, program, package }:
let
inherit (builtins)
elemAt
foldl'
fromJSON
head
length
listToAttrs
readFile
replaceStrings
tail
unsafeDiscardStringContext
throw;
inherit (pkgs) lib runCommand go jq ripgrep;
pathToName = p: replaceStrings [ "/" ] [ "_" ] (toString p);
# Collect all non-vendored dependencies from the Go standard library
# into a file that can be used to filter them out when processing
# dependencies.
stdlibPackages = runCommand "stdlib-pkgs.json" { } ''
export HOME=$PWD
export GOPATH=/dev/null
${go}/bin/go list std | \
${ripgrep}/bin/rg -v 'vendor' | \
${jq}/bin/jq -R '.' | \
${jq}/bin/jq -c -s 'map({key: ., value: true}) | from_entries' \
> $out
'';
analyser = program {
name = "analyser";
srcs = [
./main.go
];
x_defs = {
"main.stdlibList" = "${stdlibPackages}";
};
};
mkset = path: value:
if path == [ ] then { gopkg = value; }
else { "${head path}" = mkset (tail path) value; };
last = l: elemAt l ((length l) - 1);
toPackage = self: src: path: depMap: entry:
let
localDeps = map
(d: lib.attrByPath (d ++ [ "gopkg" ])
(
throw "missing local dependency '${lib.concatStringsSep "." d}' in '${path}'"
)
self)
entry.localDeps;
foreignDeps = map
(d: lib.attrByPath [ d.path ]
(
throw "missing foreign dependency '${d.path}' in '${path}, imported at ${d.position}'"
)
depMap)
entry.foreignDeps;
args = {
srcs = map (f: src + ("/" + f)) entry.files;
deps = localDeps ++ foreignDeps;
};
libArgs = args // {
name = pathToName entry.name;
path = lib.concatStringsSep "/" ([ path ] ++ entry.locator);
sfiles = map (f: src + ("/" + f)) entry.sfiles;
};
binArgs = args // {
name = (last ((lib.splitString "/" path) ++ entry.locator));
};
in
if entry.isCommand then (program binArgs) else (package libArgs);
in
{ src, path, deps ? [ ] }:
let
# Build a map of dependencies (from their import paths to their
# derivation) so that they can be conditionally imported only in
# sub-packages that require them.
depMap = listToAttrs (map
(d: {
name = d.goImportPath;
value = d;
})
(map (d: d.gopkg) deps));
name = pathToName path;
analysisOutput = runCommand "${name}-structure.json" { } ''
${analyser}/bin/analyser -path ${path} -source ${src} > $out
'';
# readFile adds the references of the read in file to the string context for
# Nix >= 2.6 which would break the attribute set construction in fromJSON
analysis = fromJSON (unsafeDiscardStringContext (readFile analysisOutput));
in
lib.fix (self: foldl' lib.recursiveUpdate { } (
map (entry: mkset entry.locator (toPackage self src path depMap entry)) analysis
))
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