119 lines
5.2 KiB
Nix
119 lines
5.2 KiB
Nix
let lib = import ./default.nix;
|
|
|
|
inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt
|
|
isString isBool head substring attrNames;
|
|
|
|
inherit (lib) all id mapAttrsFlatten elem;
|
|
|
|
in
|
|
|
|
rec {
|
|
|
|
|
|
# Wrapper aroung the primop `addErrorContext', which shouldn't used
|
|
# directly. It evaluates and returns `val', but if an evaluation
|
|
# error occurs, the text in `msg' is added to the error context
|
|
# (stack trace) printed by Nix.
|
|
addErrorContext =
|
|
if builtins ? addErrorContext
|
|
then builtins.addErrorContext
|
|
else msg: val: val;
|
|
|
|
addErrorContextToAttrs = lib.mapAttrs (a : v : lib.addErrorContext "while evaluating ${a}" v);
|
|
|
|
|
|
traceVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
|
|
traceXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
|
|
traceXMLValMarked = str: if builtins ? trace then x: (builtins.trace ( str + builtins.toXML x) x) else x: x;
|
|
|
|
# this can help debug your code as well - designed to not produce thousands of lines
|
|
traceShowVal = x : trace (showVal x) x;
|
|
traceShowValMarked = str: x: trace (str + showVal x) x;
|
|
attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${x}=") (attrNames a));
|
|
showVal = x :
|
|
if isAttrs x then
|
|
if x ? outPath then "x is a derivation, name ${if x ? name then x.name else "<no name>"}, { ${attrNamesToStr x} }"
|
|
else "x is attr set { ${attrNamesToStr x} }"
|
|
else if isFunction x then "x is a function"
|
|
else if x == [] then "x is an empty list"
|
|
else if isList x then "x is a list, first element is: ${showVal (head x)}"
|
|
else if x == true then "x is boolean true"
|
|
else if x == false then "x is boolean false"
|
|
else if x == null then "x is null"
|
|
else if isInt x then "x is an integer `${toString x}'"
|
|
else if isString x then "x is a string `${substring 0 50 x}...'"
|
|
else "x is probably a path `${substring 0 50 (toString x)}...'";
|
|
|
|
# trace the arguments passed to function and its result
|
|
# maybe rewrite these functions in a traceCallXml like style. Then one function is enough
|
|
traceCall = n : f : a : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
|
|
traceCall2 = n : f : a : b : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
|
|
traceCall3 = n : f : a : b : c : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
|
|
|
|
traceValIfNot = c: x:
|
|
if c x then true else trace (showVal x) false;
|
|
|
|
/* Evaluate a set of tests. A test is an attribute set {expr,
|
|
expected}, denoting an expression and its expected result. The
|
|
result is a list of failed tests, each represented as {name,
|
|
expected, actual}, denoting the attribute name of the failing
|
|
test and its expected and actual results. Used for regression
|
|
testing of the functions in lib; see tests.nix for an example.
|
|
Only tests having names starting with "test" are run.
|
|
Add attr { tests = ["testName"]; } to run these test only
|
|
*/
|
|
runTests = tests: lib.concatLists (lib.attrValues (lib.mapAttrs (name: test:
|
|
let testsToRun = if tests ? tests then tests.tests else [];
|
|
in if (substring 0 4 name == "test" || elem name testsToRun)
|
|
&& ((testsToRun == []) || elem name tests.tests)
|
|
&& (test.expr != test.expected)
|
|
|
|
then [ { inherit name; expected = test.expected; result = test.expr; } ]
|
|
else [] ) tests));
|
|
|
|
# create a test assuming that list elements are true
|
|
# usage: { testX = allTrue [ true ]; }
|
|
testAllTrue = expr : { inherit expr; expected = map (x: true) expr; };
|
|
|
|
# evaluate everything once so that errors will occur earlier
|
|
# hacky: traverse attrs by adding a dummy
|
|
# ignores functions (should this behavior change?) See strictf
|
|
#
|
|
# Note: This should be a primop! Something like seq of haskell would be nice to
|
|
# have as well. It's used fore debugging only anyway
|
|
strict = x :
|
|
let
|
|
traverse = x :
|
|
if isString x then true
|
|
else if isAttrs x then
|
|
if x ? outPath then true
|
|
else all id (mapAttrsFlatten (n: traverse) x)
|
|
else if isList x then
|
|
all id (map traverse x)
|
|
else if isBool x then true
|
|
else if isFunction x then true
|
|
else if isInt x then true
|
|
else if x == null then true
|
|
else true; # a (store) path?
|
|
in if traverse x then x else throw "else never reached";
|
|
|
|
# example: (traceCallXml "myfun" id 3) will output something like
|
|
# calling myfun arg 1: 3 result: 3
|
|
# this forces deep evaluation of all arguments and the result!
|
|
# note: if result doesn't evaluate you'll get no trace at all (FIXME)
|
|
# args should be printed in any case
|
|
traceCallXml = a:
|
|
if !isInt a then
|
|
traceCallXml 1 "calling ${a}\n"
|
|
else
|
|
let nr = a;
|
|
in (str: expr:
|
|
if isFunction expr then
|
|
(arg:
|
|
traceCallXml (builtins.add 1 nr) "${str}\n arg ${builtins.toString nr} is \n ${builtins.toXML (strict arg)}" (expr arg)
|
|
)
|
|
else
|
|
let r = strict expr;
|
|
in builtins.trace "${str}\n result:\n${builtins.toXML r}" r
|
|
);
|
|
}
|