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Increase readability of importAtom #39

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73 changes: 43 additions & 30 deletions src/core/importAtom.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -45,49 +45,62 @@ let
nix = backend.nix or { };

root = mod.prepDir (dirOf path);

src = builtins.seq id (
let
file = mod.parse (baseNameOf path);
len = builtins.stringLength file.name;
in
builtins.substring 0 (len - 1) file.name
);

extern =
let
fetcher = nix.fetcher or "native"; # native doesn't exist yet
conf = config.fetcher or { };
f = conf.${fetcher} or { };
root = f.root or "npins";
in
if fetcher == "npins" then
let
pins = import (dirOf path + "/${root}");
in
mod.filterMap (
k: v:
# TODO native doesn't exist yet
fetcher = nix.fetcher or "native";
throwMissingNativeFetcher = abort "Native fetcher isn't implemented yet";

fetcherConfig = config.fetcher or { };
npinRoot = fetcherConfig.npin.root or "npins";
pins = import (dirOf path + "/${npinRoot}");

fetchEnabledNpinsDep =
depName: depConfig:
let
src = "${pins.${v.name or k}}/${v.subdir or ""}";
val =
if v.import or false then
if v.args or [ ] != [ ] then
builtins.foldl' (
f: x:
let
intersect = x // (builtins.intersectAttrs x extern);
in
if builtins.isAttrs x then f intersect else f x
) (import src) v.args
depIsEnabled =
(depConfig.optional or false && builtins.elem depName features') || (!depConfig.optional or false);

npinSrc = "${pins.${depConfig.name or depName}}/${depConfig.subdir or ""}";

applyArguments =
appliedFunction: nextArgument:
let
argsFromDeps = depConfig.argsFromDeps or true && builtins.isAttrs nextArgument;
argIntersectedwithDeps = nextArgument // (builtins.intersectAttrs nextArgument extern);
in
if argsFromDeps nextArgument then
appliedFunction argIntersectedwithDeps
else
appliedFunction nextArgument;

dependency =
if depConfig.import or false then
if depConfig.args or [ ] != [ ] then
builtins.foldl' applyArguments (import npinSrc) depConfig.args
else
import src
import npinSrc
else
src;
npinSrc;
in
if (v.optional or false && builtins.elem k features') || (!v.optional or false) then
{ "${k}" = val; }
else
null
) config.fetch or { }
# else if fetcher = "native", etc
if depIsEnabled then { "${depName}" = dependency; } else null;

npinsDeps = mod.filterMap fetchEnabledNpinsDep config.fetch or { };

in
if fetcher == "npins" then
npinsDeps
else if fetcher == "native" then
throwMissingNativeFetcher
else
{ };

Expand Down