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default.nix
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default.nix
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{ lib }:
let
prettyOneLine = lib.generators.toPretty { multiline = false; };
ensureOption = n: v:
let
typeOfV = builtins.typeOf v;
type = lib.types.${typeOfV} or lib.types.any;
in if lib.isOption v then
v
else
lib.mkOption {
description = n;
type = lib.types.${typeOfV};
default = v;
defaultText = prettyOneLine v;
};
hasPrefix = p: s: builtins.isString s && lib.hasPrefix p s;
isDash = hasPrefix "-";
getLong = prefix: s: long:
let
str = lib.removePrefix prefix s;
path = lib.splitString "." str;
opt = lib.attrByPath [ str ] (lib.attrByPath path null long) long;
in if !hasPrefix prefix s then
null
else if opt == null then
null
else {
inherit str opt;
path = [ "long" ] ++ path;
};
getShort = s: short:
let
str = builtins.substring 1 1 s;
rem = builtins.substring 2 (builtins.stringLength s) s;
opt = lib.attrByPath [ str ] null short;
in if !hasPrefix "-" s || hasPrefix "--" s then
null
else if opt == null then
null
else {
inherit str opt;
rem = if builtins.stringLength rem == 0 then [ ] else [ "-${rem}" ];
path = [ "short" str ];
};
getArg = s: argv: seen:
let
argvLen = lib.length argv;
seenLen = lib.length (lib.filter (lib.hasAttr "argv") seen);
in if argvLen == 0 || seenLen >= argvLen then
null
else if !(builtins.elemAt argv seenLen).check s then
null
else {
path = [ "argv" ];
};
longAt = fst: slac: getLong "--" fst (slac.long or { });
longNoAt = fst: slac: getLong "--no-" fst (slac.long or { });
shortAt = fst: slac: getShort fst (slac.short or { });
argAt = fst: slac: seen: getArg fst (slac.argv or [ ]) seen;
commandAt = fst: slac:
if lib.isString fst then
lib.attrByPath [ "command" fst ] null slac
else
null;
fstAt = fst: slac: seen: rec {
long = longAt fst slac;
longNo = longNoAt fst slac;
short = shortAt fst slac;
command = commandAt fst slac;
arg = argAt fst slac seen;
isDefined =
lib.length (lib.filter (_: _ != null) [ long longNo short command arg ])
> 0;
};
isEnabled = slac: (slac.enabled or slac.enabled.default or false) == true;
findDefinedAtEnabled = acc: fst: slac: seen:
if (fstAt fst slac seen).isDefined then
acc
else
lib.concatMap (cmd:
if !isEnabled slac.command.${cmd} then
[ ]
else
findDefinedAtEnabled (acc ++ [ "command" cmd ]) fst
slac.command.${cmd} seen) (lib.attrNames (slac.command or { }));
argvAcc = acc:
let
parted = lib.partition (lib.hasAttr "argv") acc;
values = map (_: _.argv) parted.right;
argv = if lib.length values > 0 then [{ argv = values; }] else [ ];
in argv ++ parted.wrong;
accOpt = slac: rest: acc: argv:
let
len = lib.length argv;
isEmpty = len < 1;
hasSnd = len > 1;
fst = lib.elemAt argv 0;
snd = lib.elemAt argv 1;
fstHere = fstAt fst slac acc;
fstEnabledPath = findDefinedAtEnabled [ ] fst slac [ ];
accAt = at: val: acc ++ [ (lib.setAttrByPath at.path val) ];
in if isEmpty then {
inherit rest;
acc = argvAcc acc;
}
else if fst == "--" then {
acc = argvAcc acc;
rest = rest ++ argv;
}
else if fstHere.command != null then
let sub = accOpt fstHere.command [ ] [ ] (lib.tail argv);
in {
rest = rest ++ sub.rest;
acc = (argvAcc acc)
++ [ (lib.setAttrByPath [ "command" fst "enabled" ] true) ]
++ map (lib.setAttrByPath [ "command" fst ]) sub.acc;
}
else if !fstHere.isDefined && lib.length fstEnabledPath > 0 then
let
cmd = lib.attrByPath fstEnabledPath { } slac;
sub = accOpt cmd [ ] [ ] argv;
enabledPath = fstEnabledPath ++ [ "enabled" ];
in {
rest = rest ++ sub.rest;
acc = (argvAcc acc) ++ [ (lib.setAttrByPath enabledPath true) ]
++ map (lib.setAttrByPath fstEnabledPath) sub.acc;
}
else if fstHere.arg != null then
accOpt slac rest (accAt fstHere.arg fst) (lib.tail argv)
else if !lib.isString fst || !isDash fst then
accOpt slac (rest ++ [ fst ]) acc (lib.tail argv)
else if fstHere.longNo != null then
accOpt slac rest (accAt fstHere.longNo false) (lib.tail argv)
else if fstHere.long != null && (lib.length argv == 1 || isDash snd
|| fstHere.long.opt.type.check true) then
accOpt slac rest (accAt fstHere.long true) (lib.tail argv)
else if fstHere.long != null then
accOpt slac rest (accAt fstHere.long snd) (lib.drop 2 argv)
else if fstHere.short != null && (lib.length argv == 1 || isDash snd
|| fstHere.short.opt.type.check true || builtins.length fstHere.short.rem
> 0) then
accOpt slac rest (accAt fstHere.short true)
(fstHere.short.rem ++ lib.tail argv)
else if fstHere.short != null then
accOpt slac rest (accAt fstHere.short snd)
(fstHere.short.rem ++ lib.drop 2 argv)
else
accOpt slac (rest ++ [ fst ]) acc (lib.tail argv);
slacOptions = config: cmdPath: slac:
let
isCmdEnabled = lib.length cmdPath == 0
|| lib.attrByPath (cmdPath ++ [ "enabled" ]) false config;
subOpt = at: fn:
lib.optionalAttrs (lib.hasAttr at slac) {
${at} = lib.mkOption {
description = "clap-internal";
default = { };
type = lib.types.submodule (args:
lib.optionalAttrs isCmdEnabled {
options = lib.mapAttrs fn slac.${at};
});
};
};
longOpt = subOpt "long" ensureOption;
shortOpt = subOpt "short" ensureOption;
commandOpt = subOpt "command" (n: v:
{
enabled = if v ? enabled then
ensureOption n v.enabled
else
lib.mkEnableOption n // { description = "clap-internal"; };
} // slacOptions config (cmdPath ++ [ "command" n ]) v);
argvOpt = lib.optionalAttrs (slac ? argv) {
argv = lib.mkOption {
description = "positional arguments";
default = [ ];
type = lib.types.listOf (lib.types.oneOf slac.argv);
};
};
in longOpt // shortOpt // commandOpt // argvOpt;
optsDeclarations = slac:
({ config, ... }: {
_file = "command line options definition";
options = slacOptions config [ ] slac;
});
clapParse = slac: argv:
let
result = accOpt slac [ ] [ ] argv;
optsAcc = result.acc;
optsSet = lib.foldl lib.recursiveUpdate { } optsAcc;
optsMod = let
declarations = optsDeclarations slac;
prettyArgv = prettyOneLine argv;
definitions =
(map (v: v // { _file = "command line arguments: ${prettyArgv}"; })
optsAcc);
in { imports = [ declarations ] ++ definitions; };
opts = (lib.evalModules { modules = [ optsMod ]; }).config;
in {
inherit (result) rest;
inherit optsAcc optsSet optsMod opts;
};
clapDoc = slac:
let
flatten = { atPath ? [ ] }:
lib.pipe (optsDeclarations slac) [
(module: lib.evalModules { modules = [ module ]; })
(_: _.options)
(lib.optionAttrSetToDocList)
(lib.filter (opt: opt.visible && !opt.internal))
(lib.filter (opt: (opt.description or "") != "clap-internal"))
(lib.filter (opt: atPath == lib.take (lib.length atPath) opt.loc))
];
in { inherit flatten; };
in slac:
let
functor = f: lib.setFunctionArgs f (lib.functionArgs f);
clap = functor (clapParse slac);
docs = clapDoc slac;
in clap // { inherit docs; }